JP7810076B2 - medical devices - Google Patents

Description

This disclosure relates to medical devices.

Conventional medical devices are disclosed in Japanese Patent Application Laid-Open No. 2020-803 (Patent Document 1), Japanese Patent Application Laid-Open No. 2020-804 (Patent Document 2), Japanese Patent Application Laid-Open No. 2020-805 (Patent Document 3), and Japanese Patent Application Laid-Open No. 2020-806 (Patent Document 4).

For example, Patent Document 1 discloses a blood purification device as a medical device. The blood purification device employs a liquid delivery pump unit. The liquid delivery pump unit has a housing. This housing houses multiple liquid delivery pumps. The liquid delivery pumps are rotary valve type and equipped with five finger-type valves. The liquid delivery pumps are so-called finger pumps. The housing has a main body and a cover that can be opened and closed relative to the main body. The main body of the liquid delivery pump unit is provided with a pair of conduit holding plates. Each conduit holding plate has a notch that engages and holds the conduit.

Japanese Patent Application Laid-Open No. 2020-803 Japanese Patent Application Laid-Open No. 2020-804 Japanese Patent Application Laid-Open No. 2020-805 Japanese Patent Application Laid-Open No. 2020-806

In medical devices, when a finger pump causes a tube to move peristally, the tube is significantly deformed. This deformation can cause the tube to become caught between the finger pump valve and the tube's grip. For this reason, it is preferable to space the finger pump valve and the tube's grip apart. However, if the distance between the finger pump and the grip is too long, it becomes difficult for the medical device operator to attach the tube to the finger pump.

This disclosure was made in consideration of the above-mentioned problems, and aims to provide a medical device that can prevent a tube from becoming caught between the valve and other components of the finger pump device while suppressing a decrease in the ease of attaching the tube to the finger pump device.

A medical device according to the present disclosure comprises a tube and a finger pump device for transporting a liquid within the tube. The tube comprises a soft tube body, a first flange, and a second flange. The first flange is provided on the outer peripheral surface of the tube body. The second flange is provided on the outer peripheral surface of the tube body and is spaced apart from the first flange in the extension direction of the tube body. The finger pump device comprises a pump unit, a first tube gripping portion, a second tube gripping portion, and a first groove portion. The pump unit has a plurality of finger-shaped valves. The plurality of valves are aligned along the extension direction of the tube body. The pump unit is configured so that each of the plurality of valves clamps a portion of the tube body located between the first flange and the second flange in a direction perpendicular to the extension direction. The first tube gripping portion is located between the pump unit and the first flange. The first tube gripping portion removably holds the tube body in a direction perpendicular to the extension direction while engaging with the first flange in the extension direction. The second tube gripping portion is located between the pump unit and the second flange. The second tube gripping portion removably holds the tube body in a direction perpendicular to the extension direction while engaging with the second flange in the extension direction. The first groove portion is located between the pump unit and the first tube gripping portion. The first groove portion surrounds the tube body without contacting it. The first tube gripping portion has a first gripping surface. The first gripping surface is substantially arc-shaped when viewed from the extension direction. The first gripping surface is formed to fit along the outer peripheral surface of the tube body. The first groove width, which is the groove width of the first groove portion, is larger than the diameter of the inner peripheral surface of the first gripping surface when viewed from the extension direction.

According to the present disclosure, the first groove portion prevents the tube from becoming caught between the valve and the first tube gripping portion. Furthermore, because the first groove portion surrounds the tube, it acts as a guide when the operator attaches the tube to the finger pump device. This prevents a decrease in the ease of attaching the tube to the finger pump device. Furthermore, because the dimension of the first groove width, which is the groove width of the first groove portion, is larger than the diameter of the inner circumferential surface of the first gripping surface when viewed in the direction of extension of the tube, sticking of the tube to the first groove portion is prevented. This prevents deformation of the tube with the first groove portion as a fulcrum when the valve is actuated. Consequently, the tube is prevented from becoming caught between the valve and the first groove portion.

FIG. 1 is a schematic circuit diagram showing an extracorporeal circulation circuit in a medical device according to an embodiment of the present disclosure. FIG. 1 is a side view of a medical device according to an embodiment of the present disclosure. FIG. 1 is a perspective view of a tube according to an embodiment of the present disclosure. FIG. 1 is a front view of a finger pump device according to an embodiment of the present disclosure. FIG. 1 is a front perspective view of a finger pump device according to an embodiment of the present disclosure. 6 is a cross-sectional view of the finger pump device of FIG. 4 as viewed from the direction of the arrows along line VI-VI. 10 is a perspective view showing a second tube gripping portion and each tube gripped thereby in one embodiment of the present disclosure. FIG. FIG. 10 is a perspective view of a second tube gripping portion according to one embodiment of the present disclosure. 1 is a partial front view showing a first groove portion and its surroundings of a finger pump device according to an embodiment of the present disclosure. FIG. FIG. 10 is a partial front view showing a second groove portion and its surroundings of a finger pump device according to an embodiment of the present disclosure.

A medical device according to one embodiment of the present disclosure will be described below with reference to the drawings. In the following description of the embodiment, the same or equivalent parts in the drawings will be designated by the same reference numerals, and their description will not be repeated.

Figure 1 is a schematic circuit diagram showing an extracorporeal circulation circuit in a medical device according to an embodiment of the present disclosure. Figure 2 is a side view of a medical device according to an embodiment of the present disclosure. As shown in Figures 1 and 2, a medical device 1 according to an embodiment of the present disclosure is specifically a blood purification device. The medical device 1 is a blood purification device used for continuous renal replacement therapy (CRRT). However, the medical device 1 may also be a blood purification device used for continuous hemodiafiltration (CHDF), continuous hemofiltration (CHF), continuous hemodialysis (CHD), or slow continuous ultrafiltration (SCUF).

The medical device 1 comprises a blood purifier 2, a supply source 3, an arterial blood circuit 4, a venous blood circuit 5, a plurality of tubes 10, and a plurality of finger pump devices 20 that transport the liquid in each of the plurality of tubes 10.

The medical device 1 includes multiple tubes 10, including a first tube 10A, a second tube 10B, and a third tube 10C. The first tube 10A is specifically a dialysate tube that supplies dialysate to the blood purifier 2. The upstream end of the first tube 10A is connected to a supply source 3 that contains predetermined liquids, namely replacement fluid and dialysate. The downstream end of the first tube 10A is connected to the dialysate inlet 2a of the blood purifier 2.

The second tube 10B is specifically a drainage tube that carries the drainage fluid discharged from the blood purifier 2. The upstream end of the second tube 10B is connected to the drainage outlet 2b of the blood purifier 2.

The third tube 10C is specifically a replacement fluid tube that supplies replacement fluid to the arterial blood circuit 4 or the venous blood circuit 5. In this embodiment, the upstream end of the third tube 10C is connected to the first tube 10A. Therefore, the upstream end of the third tube 10C is connected to the supply source 3 via the first tube 10A. In addition, in this embodiment, the downstream end of the third tube 10C is connected to the venous blood circuit 5. That is, the medical device 1 (blood purification device) according to this embodiment employs a so-called post-dilution method. More specifically, the downstream end of the third tube 10C is connected to a venous air trap chamber 5a provided in the venous blood circuit 5. The medical device 1 (blood purification device) may also employ a so-called pre-dilution method. When the pre-dilution method is employed, the third tube 10C is connected to the arterial blood circuit 4 (specifically, the arterial air trap chamber 4a provided in the arterial blood circuit 4).

The arterial blood circuit 4 is connected to the blood inlet 2c of the blood purifier 2. The arterial blood circuit 4 is a circuit for introducing the patient's blood into the blood purifier 2. The arterial blood circuit 4 is provided with a blood pump 4b that pumps blood. The blood pump 4b is a peristaltic pump, more specifically a roller pump. The blood pump 4b may be a pump with a configuration similar to the finger pump device 20 described below. The venous blood circuit 5 is connected to the blood outlet 2d of the blood purifier 2. The venous blood circuit 5 is a circuit for discharging blood from the blood purifier 2 and returning it to the patient.

The medical device further includes a first connecting pipe 6a, a first weighing bag 6b, a second connecting pipe 6c, a second weighing bag 6d, a scale 7, and a measuring unit (not shown).

The first connecting conduit 6a is connected to the second tube 10B. The first measuring bag 6b is connected to the end of the first connecting conduit 6a opposite the second tube 10B side. The first measuring bag 6b temporarily stores the drained liquid and is capable of discharging the stored drained liquid. The first measuring bag 6b is a soft bag without any holes for venting air.

The second connecting conduit 6c is connected to the third tube 10C. The second measuring bag 6d is connected to the end of the second connecting conduit 6c opposite the third tube 10C side. The second measuring bag 6d temporarily stores the above-mentioned liquid as replacement fluid and is capable of dispensing the stored replacement fluid. The second measuring bag 6d is a soft bag without any air vent holes.

A first weighing bag 6b and a second weighing bag 6d are attached to the scale 7. The measurement unit is connected to the scale 7 and measures the overall change in weight of the first weighing bag 6b and the second weighing bag 6d attached to the scale 7. In this embodiment, the scale 7 is a load cell. However, the scale 7 is not limited to a load cell and may be a spring balance or the like.

Next, the specific configuration of one tube 10 will be described. Note that in this embodiment, the first tube 10A, second tube 10B, and third tube 10C all have the configuration of the tube 10 described below. However, at least one of the first tube 10A, second tube 10B, and third tube 10C may have the configuration described below.

Figure 3 is a perspective view showing a tube according to one embodiment of the present disclosure. As shown in Figure 3, the tube 10 includes a tube body 11, a first flange 12, and a second flange 13.

The tube body 11 is made of a soft material. For example, the tube body 11 is made of polyvinyl chloride or polybutadiene. The tube body 11 is flexible. The tube body 11 is configured so that the inside of the tube body 11 can be blocked by compressing it in a direction perpendicular to the extension direction. The outer diameter of the tube body 11 is, for example, 6 mm or more.

The first flange 12 is provided on the outer peripheral surface 111 of the tube body 11. The first flange 12 is configured to be able to engage with other components in the extension direction of the tube body 11. The first flange 12 has a substantially circular outer shape when viewed from the extension direction of the tube body 11. The outer diameter of the first flange 12 when viewed from the extension direction is, for example, more than 1.8 times the outer diameter of the tube body 11.

The first flange 12 has a first large diameter portion 121 and a first small diameter portion 122. The first large diameter portion 121 and the first small diameter portion 122 are aligned in the extension direction of the tube body 11. When viewed from the first large diameter portion 121, the first small diameter portion 122 is located on the opposite side from the second flange 13. Both the first large diameter portion 121 and the first small diameter portion 122 have a substantially circular outer shape when viewed from the extension direction. When viewed from the extension direction, the outer diameter of the first large diameter portion 121 is larger than the outer diameter of the first small diameter portion 122. Note that when simply referring to the outer diameter of the first flange 12, in this embodiment, the outer diameter of the first large diameter portion 121 is the outer diameter of the first flange 12.

The second flange 13 is provided on the outer peripheral surface 111 of the tube body 11 and is spaced apart from the first flange 12 in the extension direction of the tube body 11. The second flange 13 is configured to be able to engage with other components in the extension direction of the tube body 11. The second flange 13 has a substantially circular outer shape when viewed in the extension direction of the tube body 11. The outer diameter of the second flange 13 when viewed in the extension direction is, for example, 1.8 times or more the outer diameter of the tube body 11.

The second flange 13 has a second large diameter portion 131 and a second small diameter portion 132. The second large diameter portion 131 and the second small diameter portion 132 are aligned in the extension direction of the tube body 11. When viewed from the second large diameter portion 131, the second small diameter portion 132 is located on the opposite side from the first flange 12 side. Both the second large diameter portion 131 and the second small diameter portion 132 have a substantially circular outer shape when viewed from the extension direction. When viewed from the extension direction, the outer diameter of the second large diameter portion 131 is larger than the outer diameter of the second small diameter portion 132. Note that when simply referring to the outer diameter of the second flange 13, in this embodiment, the outer diameter of the second large diameter portion 131 is the outer diameter of the second flange 13.

Next, the finger pump device 20 will be described. As shown in Figures 1 and 2, the medical device 1 includes multiple finger pump devices 20, including a first finger pump device 20A, a second finger pump device 20B, and a third finger pump device 20C.

The first finger pump device 20A is specifically a dialysis fluid pump that transports dialysis fluid in the first tube 10A, which is a dialysis fluid tube. That is, the first tube 10A is attached to the first finger pump device 20A. In this embodiment, the portion of the first tube 10A between the downstream end connected to the blood purifier 2 and the point where the third tube 10C is connected is attached to the first finger pump device 20A.

The second finger pump device 20B is specifically a drainage pump that transports drainage fluid in the second tube 10B, which is a drainage tube. That is, the second tube 10B is attached to the second finger pump device 20B. In this embodiment, the portion of the second tube 10B between the upstream end connected to the blood purifier 2 and the point where the first connecting line 6a is connected is attached to the second finger pump device 20B.

The third finger pump device 20C is specifically an infusion pump that transports replacement fluid within the third tube 10C, which is a replacement fluid tube. That is, the third tube 10C is attached to the third finger pump device 20C. In this embodiment, the portion of the third tube 10C between the downstream end connected to the venous blood circuit 5 (or arterial blood circuit 4) and the point where the second connecting line 6c is connected is attached to the third finger pump device 20C.

The relative positional relationship between these multiple finger pump devices 20 is not particularly limited, but from the perspective of operability of the medical device 1, it is preferable that the multiple finger pump devices 20 be aligned in a row. In this embodiment, the multiple finger pump devices 20 are aligned vertically. More specifically, the second finger pump device 20B is located below the first finger pump device 20A, and the third finger pump device 20C is located above the first finger pump device 20A.

The medical device 1 further includes a housing 30. The housing 30 has a mounting surface 31 extending vertically. Each of the multiple finger pump devices 20 is housed within the housing 30 so that a portion of the device is exposed at the mounting surface 31. Each of the multiple finger pump devices 20 is configured so that an operator can attach the corresponding tube 10 to the mounting surface 31 side of the housing 30.

The housing 30 has a pump cover 32. The pump cover 32 is attached to the mounting surface 31 so as to be openable and closable. The pump cover 32 covers at least a portion of each of the multiple finger pump devices 20. When the pump cover 32 is in the closed position, the finger pump device 20 can transfer liquid in the tube 10. When the pump cover 32 is in the open position, the tube 10 can be attached to and detached from the finger pump device 20.

Next, the specific configuration of one finger pump device 20 will be described. Note that in this embodiment, the first finger pump device 20A, the second finger pump device 20B, and the third finger pump device 20C all have the configuration of the finger pump device 20 described below. However, at least one of the first finger pump device 20A, the second finger pump device 20B, and the third finger pump device 20C may have the configuration described below. Furthermore, unless otherwise specified, the tube 10 described in the following description is the tube 10 attached to that one finger pump device 20.

Figure 4 is a front view of a finger pump device according to one embodiment of the present disclosure. Figure 5 is a perspective view of the front side of a finger pump device according to one embodiment of the present disclosure. Figure 6 is a cross-sectional view of the finger pump device of Figure 4, viewed from the direction of the arrows along line VI-VI. In Figures 4 and 6, the tube 10 attached to the finger pump device 20 is shown by a two-dot chain line. Also, in Figures 4 to 6, some components of the finger pump device 20 may not be shown.

As shown in Figures 4 to 6, the finger pump device 20 includes a pump unit 21, a first tube gripping portion 22, a second tube gripping portion 23, a first groove portion 24, a slot portion 25, and a second groove portion 26.

The pump unit 21 includes multiple finger-shaped valves 21B, multiple eccentric cam rollers 21C, a rotating shaft 211, a stepping motor 212, a drive shaft 213, a drive belt 214, a finger case 215, and a base plate 216 (see Figure 6). Specifically, the pump unit 21 includes five valves 21B. The multiple valves 21B include valves 21B1, 21B2, 21B3, 21B4, and 21B5. The multiple valves 21B are aligned along the extension direction of the tube body 11 (more specifically, the lateral direction X, described below).

Each of the multiple valves 21B includes a valve head 21H, a shaft 21S, and a contact roller 21R. The side of the eccentric cam roller 21C abuts against the contact roller 21R. The eccentric cam roller 21C1 corresponding to valve 21B1, the eccentric cam roller 21C2 corresponding to valve 21B2, the eccentric cam roller 21C3 corresponding to valve 21B3, the eccentric cam roller 21C4 corresponding to valve 21B4, and the eccentric cam roller 21C5 corresponding to valve 21B5 are attached to the same rotating shaft 211 with their phases shifted by a predetermined angle in the rotational direction.

A drive belt 214 is wound between the drive shaft 213 of the stepping motor 212 and the rotating shaft 211. The rotational position control by the stepping motor 212 is transmitted to the rotating shaft 211 via the drive belt 214.

The stepping motor 212 controls the rotational positions of the multiple eccentric cam rollers 21C1, 21C2, 21C3, 21C4, and 21C5, thereby controlling the positions of the multiple valves 21B1, 21B2, 21B3, 21B4, and 21B5. This allows the multiple valves 21B1, 21B2, 21B3, 21B4, and 21B5 to be moved sequentially, thereby achieving the transfer of liquid within the tube 10 (tube body 11). In the medical device 1 according to this embodiment, from the perspective of transferring dialysis fluid, drainage fluid, or replacement fluid as a blood purification device, it is preferable that the flow rate of liquid within the tube 10 by the finger pump device 20 be 10 mL/min or more. Furthermore, by selecting the order in which the multiple valves 21B1, 21B2, 21B3, 21B4, and 21B5 are moved, the liquid within the tube 10 (tube body 11) can be transferred in either direction.

The finger case 215 is fixed to the housing 30. The shaft 21S passes through the finger case 215. A coil spring 21CB is installed between the finger case 215 and the contact roller 21R. The biasing force of the compressed coil spring 21CB constantly presses the valve 21B against the eccentric cam roller 21C.

The base plate 216 is positioned to face the multiple valves 21B via the tube 10 (more specifically, the portion of the tube body 11 located between the first flange 12 and the second flange 13). The base plate 216 is configured to be displaceable relative to the housing 30, as described below, to allow for attachment of the tube 10. The valve head 21H has a protrusion 21T that protrudes toward the base plate 216. The protrusion 21T has a peak that extends in a direction that intersects with the extension direction of the tube 10. As a result, when the eccentric cam roller 21C presses the valve 21B toward the base plate 216, the protrusion 21T bites into the tube 10 in line contact, reliably deforming the tube 10.

In this way, the pump unit 21 is configured so that each of the multiple valves 21B, together with the base plate 216, sandwiches a portion of the tube body 11 located between the first flange 12 and the second flange 13 in a direction perpendicular to the extension direction of the tube body 11. The multiple valves 21B are arranged along the extension direction of the tube body 11, from the first flange 12 side toward the second flange 13 side, in the order of valve 21B1, valve 21B2, valve 21B3, valve 21B4, and valve 21B5.

The base plate 216 is also attached to the pump cover 32. The pump cover 32 is configured so that the base plate 216 faces the multiple valves 21B when the pump cover 32 is closed. Therefore, as described above, when the pump cover 32 is closed, the finger pump device 20 can transfer the liquid in the tube 10. The pump cover 32 is also configured so that when the pump cover 32 is open, the base plate 216 is positioned so that it does not face the valve heads 21H of the multiple valves 21B. Therefore, as described above, when the pump cover 32 is open, the tube 10 can be attached to and detached from the finger pump device 20.

As shown in Figures 4 to 6, the first tube gripping portion 22 is located between the pump unit 21 and the first flange 12. The first tube gripping portion 22 removably holds the tube body 11 in a direction perpendicular to the extension direction of the tube body 11, while engaging with the first flange 12 in the extension direction. Specifically, the tube body 11 can be removed from the first tube gripping portion 22 in a direction away from the finger pump device 20 when the medical device 1 is viewed from the mounting surface 31 of the housing 30 (hereinafter, sometimes referred to as the "proximal direction Z1"). Furthermore, in the extension direction, the first tube gripping portion 22 engages with the first large diameter portion 121. Note that the first tube gripping portion 22 may be configured to be removable from the housing 30, similar to the second tube gripping portion 23 described below.

The first tube gripping portion 22 has a first gripping surface 221 and a first abutment surface 222. The first gripping surface 221 is generally arc-shaped when viewed from the extension direction. The first gripping surface 221 is generally C-shaped when viewed from the extension direction. In other words, the first tube gripping portion 22 opens in the forward direction Z1. The first gripping surface 221 is formed to fit along the outer peripheral surface 111 of the tube main body 11. The first abutment surface 222 faces the opposite side from the pump unit 21 in the extension direction. The first abutment surface 222 abuts against the first flange portion 12 (first large diameter portion 121).

The second tube gripping portion 23 is located between the pump unit 21 and the second flange 13. The second tube gripping portion 23 removably holds the tube body 11 in a direction perpendicular to the extension direction, while engaging with the second flange 13 in the extension direction. Specifically, the tube body 11 can be removed from the second tube gripping portion 23 after removing the second tube gripping portion 23 from the housing 30 (details will be described later). Figure 5 shows the finger pump device 20 with the second tube gripping portion 23 removed. Note that the second tube gripping portion 23 may be fixed to the housing 30, similar to the first tube gripping portion 22.

Figure 7 is a perspective view showing a second tube gripping portion and each tube gripped therein in one embodiment of the present disclosure. Figure 8 is a perspective view of the second tube gripping portion in one embodiment of the present disclosure. As shown in Figures 7 and 8, the tube body 11 can be removed from the second tube gripping portion 23 in a direction toward the finger pump device 20 (hereinafter sometimes referred to as the "rearward direction Z2") when the medical device 1 is viewed from the mounting surface 31 of the housing 30. Furthermore, in the above-mentioned extension direction, the second tube gripping portion 23 engages with the second large diameter portion 131.

The second tube gripping portion 23 has a second gripping surface 231 and a second abutment surface 232. The second tube gripping portion 23 is generally arc-shaped when viewed from the extension direction. The second gripping surface 231 is generally C-shaped when viewed from the extension direction. In other words, the second tube gripping portion 23 opens in the depth direction Z2. The second gripping surface 231 is formed to fit along the outer peripheral surface 111 of the tube main body 11. The second abutment surface 232 faces the opposite side from the pump unit 21 in the extension direction. The second abutment surface 232 abuts against the second flange portion 13 (second large diameter portion 131).

The second tube gripping portion 23 that grips the first tube 10A, the second tube gripping portion 23 that grips the second tube 10B, and the second tube gripping portion 23 that grips the third tube 10C are connected to one another. These multiple second tube gripping portions 23 are configured as a single member called a gripping plate 23P. The gripping plate 23P extends in the direction in which the multiple tubes 10 are arranged. One main surface of the gripping plate 23P has multiple second abutment surfaces 232. Note that the multiple second tube gripping portions 23 do not have to be connected to one another.

As shown in Figures 4 to 6, the pump unit 21, the first tube gripping portion 22, and the second tube gripping portion 23 are aligned in the lateral direction X. In this embodiment, the lateral direction X is horizontal. When the tube 10 is not attached to the finger pump device 20, the distance between the first flange 12 and the second flange 13 in the extension direction of the tube 10 is longer than the linear distance between the first flange 12 and the second flange 13 when the tube 10 is attached to the finger pump device 20 (i.e., when engaged with both the first tube gripping portion 22 and the second tube gripping portion 23). Therefore, the tube body 11 bends downward between the first flange 12 and the second flange 13.

Figure 9 is a partial front view showing the first groove portion and its surroundings of a finger pump device according to one embodiment of the present disclosure. As shown in Figures 4 to 6 and 9, the first groove portion 24 is located between the pump unit 21 and the first tube gripping portion 22. Specifically, the first groove portion 24 is located between the first tube gripping portion 22 and the valve 21B1, which is located closest to the first flange 12 and the first tube gripping portion 22. More specifically, the first groove portion 24 is located between the valve head 21H of the valve 21B1 and the first tube gripping portion 22. No other components are located between the valve head 21H of the valve 21B1 and the first groove portion 24.

The first groove 24 surrounds the tube body 11 without contacting it. The first groove 24 has a first inner circumferential surface 241. The first inner circumferential surface 241 is generally arc-shaped when viewed from the extension direction (or the lateral direction X, which is the direction in which the first tube gripping portion 22 and the second tube gripping portion 23 are aligned). The first inner circumferential surface 241 is generally C-shaped when viewed from the extension direction of the tube 10. In other words, the first groove 24 opens in the forward direction Z1. Note that the first groove 24 does not necessarily have to have a generally arc-shaped first inner circumferential surface 241. For example, the first groove 24 may be U-shaped when viewed from the extension direction, thereby opening in the forward direction Z1.

The first groove width W1 of the first groove portion 24 is larger than the diameter D1 of the inner peripheral surface of the first gripping surface 221 when viewed from the extension direction (or the horizontal direction X, which is the direction in which the first tube gripping portion 22 and the second tube gripping portion 23 are aligned). The first groove width W1 is the length in the vertical direction Y when the first groove portion 24 is viewed from the opening direction (i.e., the forward direction Z1). The vertical direction Y is a direction perpendicular to both the horizontal direction X and the forward direction Z1. The first groove width W1 is smaller than the outer diameter of the first flange portion 12. The first groove width W1 is 1.2 to 1.8 times the outer diameter of the tube body 11. The first groove width W1 is smaller than the height of the valve head 21H in the vertical direction Y.

Furthermore, the dimension of the first groove width W1 is equal to the diameter of the first inner circumferential surface 241 when viewed from the extension direction. Therefore, the diameter of the first inner circumferential surface 241 when viewed from the extension direction is larger than the diameter D1 of the inner circumferential surface of the first gripping surface 221. The diameter of the first inner circumferential surface 241 when viewed from the extension direction is smaller than the outer diameter of the first flange 12. The diameter of the first inner circumferential surface 241 when viewed from the extension direction is 1.2 to 1.8 times the outer diameter of the tube body 11. The outer diameter of the first inner circumferential surface 241 when viewed from the extension direction is smaller than the height of the valve head 21H in the vertical direction Y.

The first groove portion 24 has a first widening portion 243 at the opening end 242 on the pump unit 21 side in the extension direction of the first groove portion 24, such that the first groove width W1 gradually increases toward the pump unit 21. The first widening portion 243 is formed by chamfering the opening end 242. In this embodiment, the chamfer is a so-called R-chamfer, but it may also be a C-chamfer. In other words, when viewed from the near side Z1, the edge of the first widening portion 243 in the vertical direction Y extends in a curved manner in this embodiment, but may also extend in a straight line. The maximum width WM1 (maximum length in the vertical direction Y) of the first widening portion 243 is at least 1.2 times the outer diameter of the tube body 11. Furthermore, the maximum width WM1 of the first widening portion 243 is more preferably at least 1.4 times the outer diameter of the tube body 11, and even more preferably at least 1.6 times. Additionally, at the first widening portion 243, the first inner circumferential surface 241 widens to increase in diameter.

The slot portion 25 removably holds the second tube gripping portion 23 together with the tube 10 in the forward direction Z1. The slot portions 25 corresponding to the first tube 10A, second tube 10B, and third tube 10C are connected to each other in the vertical direction Y to form the plate slot portion 25P. The plate slot portion 25P removably holds the gripping plate 23P together with the first tube 10A, second tube 10B, and third tube 10C in the forward direction Z1.

Figure 10 is a partial front view showing the second groove portion and its surroundings of a finger pump device in one embodiment of the present disclosure. As shown in Figures 4 to 6 and 10, the second groove portion 26 is located between the pump unit 21 and the slot portion 25. Specifically, the second groove portion 26 is located between the second tube gripping portion 23 and the valve 21B5, which is located closest to the second flange portion 13 and the second tube gripping portion 23. More specifically, the second groove portion 26 is located between the valve head 21H of the valve 21B5 and the second tube gripping portion 23. No other components are located between the valve head 21H of the valve 21B5 and the second groove portion 26.

The second groove 26 surrounds the tube body 11 without contacting it. The second groove 26 has a second inner circumferential surface 261. The second inner circumferential surface 261 is generally arc-shaped when viewed from the extension direction (or the lateral direction X). The second inner circumferential surface 261 is generally C-shaped when viewed from the extension direction of the tube 10. In other words, the second groove 26 opens in the forward direction Z1. Note that the second groove 26 does not have to have a generally arc-shaped second inner circumferential surface 261. For example, the second groove 26 may be U-shaped when viewed from the extension direction, thereby opening in the forward direction Z1.

The dimension of the second groove width W2, which is the groove width of the second groove portion 26, is larger than the diameter D2 of the inner surface of the second gripping surface 231 when viewed from the extension direction (or the horizontal direction X, which is the direction in which the first tube gripping portion 22 and the second tube gripping portion 23 are aligned). The second groove width W2 is the length in the vertical direction Y when the second groove portion 26 is viewed from the opening direction (i.e., the forward direction Z1). The second groove width W2 is smaller than the outer diameter of the first flange portion 12. The second groove width W2 is 1.2 to 1.8 times the outer diameter of the tube body 11. The second groove width W2 is smaller than the height of the valve head 21H in the vertical direction Y.

Furthermore, the dimension of the second groove width W2 is equal to the diameter of the second inner circumferential surface 261 when viewed from the extension direction. Therefore, the diameter of the second inner circumferential surface 261 when viewed from the extension direction is larger than the diameter D2 of the second gripping surface 231. The diameter of the second inner circumferential surface 261 when viewed from the extension direction is smaller than the outer diameter of the second flange 13. The diameter of the second inner circumferential surface 261 when viewed from the extension direction is 1.2 times or more and 1.8 times or less the outer diameter of the tube body 11. The outer diameter of the second inner circumferential surface 261 when viewed from the extension direction is smaller than the height of the valve head 21H in the vertical direction Y.

The second groove portion 26 has a second widening portion 263 at its opening end 262 on the pump unit 21 side in the extension direction of the second groove portion 26, such that the second groove width W2 gradually increases toward the pump unit 21. The second widening portion 263 is formed by chamfering the opening end 262. In this embodiment, the chamfer is a so-called R-chamfer, but it may also be a C-chamfer. In other words, when viewed from the near side Z1, the edge of the second widening portion 263 in the vertical direction Y extends in a curved manner in this embodiment, but may also extend in a straight line. The maximum width WM2 (maximum length in the vertical direction Y) of the second widening portion 263 is at least 1.2 times the outer diameter of the tube body 11. Furthermore, the maximum width WM2 of the second widening portion 263 is more preferably at least 1.4 times the outer diameter of the tube body 11, and even more preferably at least 1.6 times. Additionally, at the second widening portion 263, the second inner circumferential surface 261 widens to increase in diameter.

In this embodiment, the finger pump device 20 further includes a third groove portion 27, a first fitting portion 28, and a second fitting portion 29.

The third groove 27 is located between the second tube gripping portion 23 and the second groove 26 in the extension direction of the tube 10. The third groove 27 surrounds the tube body 11. The length in the vertical direction Y of the third inner circumferential surface 271 of the third groove 27 when viewed from the forward direction Z1 is smaller than the diameter of the second inner circumferential surface 261 when the second groove 26 is viewed from the extension direction of the tube 10. The finger pump device 20 does not need to have the third groove 27. In this case, the second tube gripping portion 23 and the second groove 26 may be adjacent in the horizontal direction X.

The first fitting portion 28 is located on the opposite side of the pump unit 21 from the first tube gripping portion 22 in the extension direction of the tube 10. The first flange portion 12 is fitted into the first fitting portion 28. The maximum length of the first fitting portion 28 in the vertical direction Y (i.e., the length in the vertical direction Y of the portion of the first fitting portion 28 into which the first large diameter portion 121 is fitted) is greater than the diameter of the first inner circumferential surface 241 of the first groove portion 24 when viewed from the extension direction of the tube 10. The finger pump device 20 does not necessarily have to include the first fitting portion 28.

The second fitting portion 29 is located on the opposite side of the pump unit 21 from the second tube gripping portion 23 in the extension direction of the tube 10. The second flange portion 13 (only the second large diameter portion 131 in this embodiment) is fitted into the second fitting portion 29. The maximum length of the second fitting portion 29 in the vertical direction Y is greater than the diameter of the second inner circumferential surface 261 of the second groove portion 26 when viewed from the extension direction of the tube 10. The finger pump device 20 does not necessarily have to include the second fitting portion 29.

In this embodiment, to attach tubes 10 to the finger pump device 20, first, the tube bodies 11 of multiple tubes 10 are held by the second tube gripping portions 23 of the gripping plate 23P. Then, with the pump cover 32 in the open position, the gripping plate 23P is inserted into the plate slot portion 25P, and the tube bodies 11 of each tube 10 are held by the first tube gripping portion 22, the first flange portion 12 is fitted into the first fitting portion 28, and the second flange portion 13 is fitted into the second fitting portion 29. The pump cover 32 is then closed, and the multiple valve heads 21H and the base plate 216 are brought into opposition via the tube bodies 11. This completes the attachment of the tubes 10 to the finger pump device 20.

In a medical device 1 according to one embodiment of the present disclosure, the first groove 24 is located between the pump unit 21 and the first tube gripping portion 22. The first groove 24 surrounds the tube body 11 without contacting it. The first tube gripping portion 22 has a first gripping surface 221. The first gripping surface 221 is generally arc-shaped when viewed from the extension direction. The first gripping surface 221 is formed to fit along the outer peripheral surface 111 of the tube body 11. The dimension of the first groove width W1, which is the groove width of the first groove 24, is greater than the diameter D1 of the inner peripheral surface of the first gripping surface 221 when viewed from the extension direction.

With the above configuration, the first groove 24 prevents the tube 10 (specifically, the tube body 11) from becoming caught between the valve 21B (specifically, the valve head 21H of the valve 21B1) and the first tube gripping portion 22. Furthermore, because the first groove 24 surrounds the tube 10, the first groove 24 serves as a guide when the operator attaches the tube 10 to the finger pump device 20. This prevents a decrease in the ease of attaching the tube 10 to the finger pump device 20. Furthermore, because the dimension of the first groove width W1 is larger than the diameter D1 of the inner circumferential surface of the first gripping surface 221 when viewed from the extension direction, sticking of the tube 10 to the first groove 24 is prevented. This prevents deformation of the tube 10 with the first groove 24 as a fulcrum when the valve 21B is actuated. Consequently, the tube 10 is prevented from becoming caught between the valve 21B and the first groove 24.

In one embodiment of the present disclosure, the dimension of the first groove width W1 is smaller than the outer diameter of the first flange portion 12.

The above configuration prevents the operator of the medical device 1 from incorrectly attaching the first flange portion 12 to the first groove portion 24.

In one embodiment of the present disclosure, the dimension of the first groove width W1 is 1.2 times or more and 1.8 times or less the outer diameter of the tube body 11.

With the above configuration, the first groove width W1 is at least 1.2 times the outer diameter of the tube body 11, which further reduces the likelihood of the tube 10 sticking to the first groove portion 24. Furthermore, the first groove width W1 is no more than 1.8 times the outer diameter of the tube body 11, which sufficiently reduces the likelihood of the operator of the medical device 1 incorrectly attaching the first flange portion 12 to the first groove portion 24.

In one embodiment of the present disclosure, the first groove portion 24 has a first widening portion 243 at the opening end 242 on the pump unit 21 side in the extension direction of the first groove portion 24, such that the first groove width W1 gradually increases as the groove approaches the pump unit 21.

The above configuration further prevents the tube body 11 from sticking near the open end 242 of the first groove portion 24.

In one embodiment of the present disclosure, the maximum width WM1 of the first widened portion 243 is 1.2 times or more the outer diameter of the tube body 11.

The above configuration further reduces sticking of the tube body 11 near the open end 242 of the first groove portion 24.

In one embodiment of the present disclosure, the second groove 26 is located between the pump unit 21 and the slot 25. The second groove 26 surrounds the tube body 11 without contacting it. The second tube gripping portion 23 has a second gripping surface 231. The second tube gripping portion 23 is generally arc-shaped when viewed from the extension direction. The second gripping surface 231 is formed to fit along the outer peripheral surface 111 of the tube body 11. The dimension of the second groove width W2, which is the groove width of the second groove 26, is larger than the diameter D2 of the inner peripheral surface of the second gripping surface 231 when viewed from the extension direction.

With the above configuration, the second groove 26 prevents the tube 10 from becoming caught between the valve 21B (specifically, the valve head 21H of the valve 21B5) and the second tube gripping portion 23 or the slot portion 25. Furthermore, because the second groove 26 surrounds the tube 10, the second groove 26 acts as a guide when the operator attaches the tube 10 to the finger pump device 20. This prevents a decrease in the ease of attaching the tube 10 to the finger pump device 20. Furthermore, because the dimension of the second groove width W2 is larger than the diameter D2 of the inner circumferential surface of the second gripping surface 231 when viewed from the extension direction, adhesion of the tube 10 to the second groove 26 is prevented. This prevents deformation of the tube 10 with the second groove 26 as a fulcrum when the valve 21B is actuated. Consequently, it is possible to prevent the tube 10 from becoming caught between the valve 21B and the second groove 26.

In one embodiment of the present disclosure, the dimension of the second groove width W2 is smaller than the outer diameter of the second flange portion 13.

The above configuration prevents the operator of the medical device 1 from incorrectly attaching the second flange portion 13 to the second groove portion 26.

In one embodiment of the present disclosure, the dimension of the second groove width W2 is 1.2 times or more and 1.8 times or less the outer diameter of the tube body 11.

With the above configuration, the dimension of the second groove width W2 is 1.2 times or more the outer diameter of the tube body 11, which further reduces adhesion of the tube 10 to the second groove portion 26. Furthermore, the dimension of the second groove width W2 is 1.8 times or less the outer diameter of the tube body 11, which sufficiently reduces the chance that the operator of the medical device 1 will incorrectly attach the second flange portion 13 to the second groove portion 26.

In one embodiment of the present disclosure, the second groove portion 26 has a second widening portion 263 at the opening end 262 on the pump unit 21 side in the extension direction of the second groove portion 26, such that the first groove width W1 gradually increases as the groove approaches the pump unit 21.

The above configuration further prevents the tube body 11 from sticking near the open end 262 of the second groove portion 26.

In one embodiment of the present disclosure, the maximum width WM2 of the second widened portion 263 is 1.2 times or more the outer diameter of the tube body 11.

The above configuration further reduces sticking of the tube body 11 near the open end 262 of the second groove portion 26.

In one embodiment of the present disclosure, the distance between the first flange 12 and the second flange 13 in the extension direction when the tube 10 is not attached to the finger pump device 20 is longer than the linear distance between the first flange 12 and the second flange 13 when the tube 10 is attached to the finger pump device 20.

With the above configuration, the portion of the tube body 11 that corresponds to the pump unit 21 bends. This prevents the tube body 11 from being stretched in the extension direction and undergoing unintended deformation when the tube body 11 is clamped between the valve 21B of the pump unit 21. As a result, the finger pump device 20 can stably transport the liquid in the tube body 11 at a predetermined flow rate.

In one embodiment of the present disclosure, the pump unit 21, the first tube gripping portion 22, and the second tube gripping portion 23 are aligned horizontally with respect to one another.

With the above configuration, the portion of the tube body 11 corresponding to the pump unit 21 is more likely to bend under its own weight. This further reduces the possibility of the tube body 11 being stretched in the extension direction and undergoing unintended deformation when the tube body 11 is clamped between the valve 21B of the pump unit 21. As a result, the finger pump device 20 can stably transport the liquid in the tube body 11 at a predetermined flow rate.

In the above description of the embodiments, configurations that can be combined may be combined with each other.

The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims, not the above description, and is intended to include all modifications that are equivalent in meaning to and within the scope of the claims.

1 Medical device, 2 Blood purifier, 2a Dialysis fluid inlet, 2b Drainage outlet, 2c Blood inlet, 2d Blood outlet, 3 Supply source, 4 Arterial blood circuit, 4a Arterial air trap chamber, 4b Blood pump, 5 Venous blood circuit, 5a Venous air trap chamber, 6a First connecting pipe, 6b First measuring bag, 6c Second connecting pipe, 6d Second measuring bag, 7 Scale, 10 Tube, 10A First tube, 10B Second tube, 10C Third tube, 11 Tube body, 111 Outer surface, 12 First flange, 121 First large diameter portion, 122 First small diameter portion, 13 Second flange, 131 Second large diameter portion, 132 Second small diameter portion, 20 Finger pump device, 20A First finger pump device, 20B Second finger pump device, 20C Third finger pump device, 21 pump unit, 21B, 21B1, 21B2, 21B3, 21B4, 21B5 valve, 21C, 21C1, 21C2, 21C3, 21C4, 21C5 eccentric cam roller, 21CB coil spring, 21H valve head, 21R abutment roller, 21S shaft, 21T protrusion, 211 rotating shaft, 212 stepping motor, 213 drive shaft, 214 drive belt, 215 finger case, 216 base plate, 22 first tube gripping portion, 221 first gripping surface, 222 first abutment surface, 23 second tube gripping portion, 23P gripping plate, 231 second gripping surface, 232 second abutment surface, 24 first groove portion, 241 first inner circumferential surface, 242 Opening end, 243: First widening portion, 25: Slot portion, 25P: Plate slot portion, 26: Second groove portion, 261: Second inner peripheral surface, 262: Opening end, 263: Second widening portion, 27: Third groove portion, 271: Inner peripheral surface, 28: First fitting portion, 29: Second fitting portion, 30: Housing, 31: Mounting surface, 32: Pump cover.

Claims (12)

1. A medical device comprising a tube and a finger pump device for transporting a liquid within the tube,
The tube
A soft tube body;
a first flange portion provided on an outer peripheral surface of the tube body;
a second flange portion provided on the outer circumferential surface of the tube body and spaced apart from the first flange portion in the extension direction of the tube body,
The finger pump device is
a pump unit having a plurality of finger-shaped valves arranged along the extension direction of the tube body, each of the plurality of valves configured to sandwich a portion of the tube body located between the first flange portion and the second flange portion in a direction perpendicular to the extension direction;
a first tube gripping portion located between the pump unit and the first flange portion, the first tube gripping portion removably holding the tube body in a direction perpendicular to the extension direction and engaging with the first flange portion in the extension direction;
a second tube gripping portion located between the pump unit and the second flange portion, the second tube gripping portion removably holding the tube body in a direction perpendicular to the extension direction and engaging with the second flange portion in the extension direction;
a first groove portion located between the pump unit and the first tube gripping portion in the extension direction and surrounding the tube body without contacting the tube body;
the first tube gripping portion has a first gripping surface that is substantially arc-shaped when viewed from the extension direction and is formed along the outer circumferential surface of the tube body,
A medical device, wherein the dimension of a first groove width, which is the groove width of the first groove portion, is larger than the diameter of the inner surface of the first gripping surface when viewed from the extension direction. The medical device described in claim 1, wherein the first groove width is smaller than the outer diameter of the first flange portion. The medical device described in claim 2, wherein the dimension of the first groove width is 1.2 times or more and 1.8 times or less the outer diameter of the tube body. The medical device described in claim 1, wherein the first groove portion has a first widening portion at the open end on the pump unit side in the extension direction of the first groove portion, such that the first groove width gradually increases as the groove approaches the pump unit. The medical device described in claim 4, wherein the maximum width dimension of the first widening portion is 1.2 times or more the outer diameter of the tube body. The finger pump device is
a slot portion for removably retaining the second tube gripping portion together with the tube;
a second groove portion located between the pump unit and the slot portion and surrounding the tube body without contacting the tube body;
the second tube gripping portion has a second gripping surface that is substantially arc-shaped when viewed from the extension direction and is formed along the outer circumferential surface of the tube body,
The medical device according to claim 1 , wherein the dimension of the second groove width, which is the groove width of the second groove portion, is larger than the diameter of the inner surface of the second gripping surface when viewed from the extension direction. The medical device described in claim 6, wherein the second groove width is smaller than the outer diameter of the second flange portion. The medical device described in claim 7, wherein the dimension of the second groove width is 1.2 times or more and 1.8 times or less the outer diameter of the tube body. The medical device described in claim 6, wherein the second groove portion has a second widening portion at the open end on the pump unit side in the extension direction of the second groove portion, such that the second groove width gradually increases toward the pump unit. The medical device described in claim 9, wherein the maximum width of the second widened portion is 1.2 times or more the outer diameter of the tube body. The medical device of claim 1, wherein the distance between the first flange and the second flange in the extension direction when the tube is not attached to the finger pump device is longer than the linear distance between the first flange and the second flange when the tube is attached to the finger pump device. The medical device of claim 11 , wherein the pump unit, the first tube gripping portion, and the second tube gripping portion are horizontally aligned with one another.