JP7826866B2 - 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 pump is a rotary valve type equipped with five finger-type valves. The liquid delivery pump is a so-called finger pump. The valve includes a valve head, a shaft, and a contact roller. The side of an eccentric cam roller abuts against the contact roller. The rotational position of the eccentric cam roller is directly controlled by a stepping motor. Each eccentric cam roller is attached to the same rotating shaft. A drive belt is wound between the drive shaft of the stepping motor and the rotating shaft. The rotational position control by the stepping motor is transmitted to the rotating shaft via the drive belt.

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 order for a finger pump to operate normally, the tension of the drive belt must be adjusted appropriately. In conventional medical devices, the entire pump unit had to be removed from the housing in which the finger pump was installed in order to adjust the tension of the drive belt. This made adjusting the tension of the finger pump's drive belt complicated.

This disclosure was made in consideration of the above-mentioned problems, and aims to provide a medical device that makes it easier to adjust the tension of a finger pump's drive belt.

The medical device comprises a housing, a finger pump incorporated into the housing, and a support unit that supports the finger pump inside the housing. The housing comprises a main body, a first side wall, and a second side wall. The main body houses at least a portion of the finger pump. The first side wall is provided on the main body. The first side wall has an opening. The second side wall is provided on the main body opposite the first side wall. The second side wall is detachably attached to the main body. The finger pump comprises multiple finger valves, a base plate, a rotating shaft, multiple eccentric cam rollers, a motor, a drive shaft, and a drive belt. The multiple finger valves extend from the inside of the main body toward the opening. The multiple finger valves are aligned along the extension direction of the first side wall. The base plate, together with the multiple finger valves, clamps a medical tube located outside the housing at the opening. The rotating shaft is located on the second side wall side as viewed from the multiple finger valves. The multiple eccentric cam rollers are attached to the rotating shaft with their rotational phases shifted by a predetermined angle from one another. The multiple eccentric cam rollers abut against the multiple finger valves, respectively. The motor is located on the second side wall side as viewed from the rotating shaft. The drive shaft extends from the motor and is rotated by the motor. The drive belt is wound around the rotating shaft and the drive shaft. The support unit includes a shaft support portion, a motor support portion, a locked portion, and a screw member. The shaft support portion rotatably supports the rotating shaft. The motor support portion is connected to the shaft support portion. The motor support portion supports the motor movably along the opposing direction in which the first side wall and the second side wall oppose each other. The locked portion is connected to the motor support portion. The locked portion is located on the second side wall side as viewed from the motor. The locked portion has a through hole that penetrates in the opposing direction. The screw member is inserted into the through-hole from the second side wall side and engages with the engaged portion. The screw member screws into the motor.

This disclosure makes it easier to adjust the tension of a finger pump's drive belt.

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 perspective view of a medical device according to an embodiment of the present disclosure, viewed from a first side wall side. FIG. 10 is a perspective view of a medical device according to an embodiment of the present disclosure, viewed from a second side wall side. 4 is a schematic cross-sectional view of the medical device of FIG. 2 as viewed from the direction of the arrows IV-IV. 1 is a view of a medical device according to an embodiment of the present disclosure viewed from the first side wall side when the side wall cover is in an open state. FIG. FIG. 10 is a perspective view illustrating a medical device according to an embodiment of the present disclosure with a second side wall removed from a main body portion. FIG. 1 is a side view of a multiple finger pump in one embodiment of the present disclosure. FIG. 2 is a perspective view showing a portion of a finger pump and a portion of a support unit according to an embodiment of the present disclosure.

A medical device according to one embodiment of the present invention 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 one embodiment of the present disclosure. Figure 2 is a perspective view of a medical device according to one embodiment of the present disclosure, viewed from the first side wall side. Figure 3 is a perspective view of a medical device according to one embodiment of the present disclosure, viewed from the second side wall side.

As shown in Figures 1 to 3, a medical device 1 according to one 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).

Figure 4 is a schematic cross-sectional view of the medical device in Figure 2, viewed from the direction of the arrows along line IV-IV. Figure 4 shows a partial configuration in plan view. As shown in Figures 1 to 4, the medical device 1 comprises multiple medical tubes 2, a blood purifier 3, a supply source 4, an arterial blood circuit 5, a venous blood circuit 6, a housing 10, multiple finger pumps 20, a support unit 30, and a side wall cover 40. In Figure 4, the medical tubes 2 attached to the finger pumps 20 are indicated by dashed double-dashed lines.

The medical tube 2 is made of a soft material. For example, the medical tube 2 is made of polyvinyl chloride or polybutadiene. The medical tube 2 is flexible. The medical tube 2 is configured so that the inside of the medical tube 2 can be blocked by compressing it in a direction perpendicular to the extension direction.

The medical device 1 includes multiple medical tubes 2: a first medical tube 2A, a second medical tube 2B, and a third medical tube 2C.

The first medical tubing 2A is specifically a dialysis fluid tube that supplies dialysis fluid to the blood purifier 3. The upstream end of the first medical tubing 2A is connected to a supply source 4 that contains predetermined liquids, namely replacement fluid and dialysis fluid. The downstream end of the first medical tubing 2A is connected to the dialysis fluid inlet 3a of the blood purifier 3.

The second medical tube 2B is specifically a drainage tube that carries the drainage fluid discharged from the blood purifier 3. The upstream end of the second medical tube 2B is connected to the drainage outlet 3b of the blood purifier 3.

The third medical tubing 2C is specifically a replacement fluid tubing that supplies replacement fluid to the arterial blood circuit 5 or the venous blood circuit 6. In this embodiment, the upstream end of the third medical tubing 2C is connected to the first medical tubing 2A. Therefore, the upstream end of the third medical tubing 2C is connected to the supply source 4 via the first medical tubing 2A. In addition, in this embodiment, the downstream end of the third medical tubing 2C is connected to the venous blood circuit 6. 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 medical tubing 2C is connected to a venous air trap chamber 6a provided in the venous blood circuit 6. 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 medical tubing 2C is connected to the arterial blood circuit 5 (specifically, the arterial air trap chamber 5a provided in the arterial blood circuit 5).

The arterial blood circuit 5 is connected to the blood inlet 3c of the blood purifier 3. The arterial blood circuit 5 is a circuit for introducing the patient's blood into the blood purifier 3. The arterial blood circuit 5 is provided with a blood pump 5b that pumps blood. The blood pump 5b is a peristaltic pump, more specifically a roller pump. The blood pump 5b may be a pump having a configuration similar to the finger pump 20 described below. The venous blood circuit 6 is connected to the blood outlet 3d of the blood purifier 3. The venous blood circuit 6 is a circuit for discharging blood from the blood purifier 3 and returning it to the patient.

The medical device further includes a first connecting pipe 7a, a first weighing bag 7b, a second connecting pipe 7c, a second weighing bag 7d, a scale 8, and a measuring unit (not shown).

The first connecting conduit 7a is connected to the second medical tubing 2B. The first measuring bag 7b is connected to the end of the first connecting conduit 7a opposite the second medical tubing 2B side. The first measuring bag 7b temporarily stores the drained fluid and is capable of discharging the stored drained fluid. The first measuring bag 7b is a soft bag without any air vent holes.

The second connecting conduit 7c is connected to the third medical tubing 2C. The second measuring bag 7d is connected to the end of the second connecting conduit 7c opposite the end connected to the third medical tubing 2C. The second measuring bag 7d temporarily stores the above-mentioned liquid as replacement fluid and is capable of dispensing the stored replacement fluid. The second measuring bag 7d is a soft bag without any air vent holes.

A first weighing bag 7b and a second weighing bag 7d are attached to the scale 8. The measuring unit is connected to the scale 8 and measures the overall change in weight of the first weighing bag 7b and the second weighing bag 7d attached to the scale 8. In this embodiment, the scale 8 is a load cell. However, the scale 8 is not limited to a load cell and may be a spring balance or the like.

Next, the housing 10 will be described. Figure 5 is a view of a medical device according to one embodiment of the present disclosure, viewed from the first side wall when the side wall cover is in an open state. As shown in Figures 1 to 5, the housing 10 includes a main body 11, a first side wall 12, and a second side wall 13.

The main body 11 houses at least a portion of each of the multiple finger pumps 20. A first side wall 12 is provided on the main body 11. The first side wall 12 has an opening 121. A side wall cover 40 is attached to the first side wall 12 in an openable and closable manner. In the closed state, the side wall cover 40 covers at least a portion of the first side wall 12. In the closed state, the side wall cover 40 covers the opening 121. When the side wall cover 40 is in the open state, multiple medical tubes 2 can be attached to the multiple finger pumps 20, respectively, as described below. Note that the medical device 1 does not necessarily have to include a side wall cover 40.

The second side wall 13 is provided on the main body 11 on the opposite side from the first side wall 12. The second side wall 13 is detachably attached to the main body 11. Figure 6 is a perspective view of a medical device according to one embodiment of the present disclosure, showing the second side wall removed from the main body. As shown in Figures 4 and 6, no other components are located between the support unit 30 and the second side wall 13.

Next, the finger pumps 20 will be described. Each of the multiple finger pumps 20 is incorporated into the housing 10. Each of the multiple finger pumps 20 is arranged so that a portion of it is exposed from the opening 121 in the first side wall 12 provided in the main body 11 of the housing 10.

As shown in FIG. 1, the medical device 1 includes multiple finger pumps 20, including a first finger pump 20A, a second finger pump 20B, and a third finger pump 20C.

The first finger pump 20A is specifically a dialysis fluid pump that transports dialysis fluid in the first medical tube 2A, which is a dialysis fluid tube. That is, the first medical tube 2A is attached to the first finger pump 20A. In this embodiment, the portion of the first medical tube 2A between the downstream end connected to the blood purifier 3 and the point where the third medical tube 2C is connected is attached to the first finger pump 20A.

The second finger pump 20B is specifically a drainage pump that transports drainage fluid in the second medical tube 2B, which is a drainage tube. That is, the second medical tube 2B is attached to the second finger pump 20B. In this embodiment, the portion of the second medical tube 2B between the upstream end connected to the blood purifier 3 and the point where the first connecting line 7a is connected is attached to the second finger pump 20B.

The third finger pump 20C is specifically an infusion pump that transports replacement fluid within the third medical tube 2C, which is a replacement fluid tube. In other words, the third medical tube 2C is attached to the third finger pump 20C. In this embodiment, the portion of the third medical tube 2C between the downstream end connected to the venous blood circuit 6 (or arterial blood circuit 5) and the point where the second connecting line 7c is connected is attached to the third finger pump 20C.

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

The multiple finger pumps 20 are supported by a frame portion 201. When the medical device 1 is viewed from the first side wall 12 side, the multiple finger pumps 20 are surrounded by the frame portion 201. The frame portion 201 is fitted into the opening 121.

Next, the specific configuration of one finger pump 20 will be described. Note that in this embodiment, the first finger pump 20A, second finger pump 20B, and third finger pump 20C all have the configuration of the finger pump 20 described below. However, at least one of the first finger pump 20A, second finger pump 20B, and third finger pump 20C may have the configuration described below. Furthermore, the medical tube 2 described in the following description is the medical tube 2 attached to the one finger pump 20, unless otherwise specified.

Figure 7 is a side view of multiple finger pumps according to one embodiment of the present disclosure. Some components of the finger pump 20 may not be shown in Figure 7.

As shown in Figures 4 and 7, the finger pump 20 includes multiple finger valves 21, a base plate 22, a rotating shaft 23, multiple eccentric cam rollers 24, a motor 25, a drive shaft 26, a drive belt 27, a finger case 28, and a pump cover 29.

The multiple finger valves 21 extend from the inside of the main body 11 toward the opening 121. The multiple finger valves 21 extend along the opposing direction X in which the first side wall 12 and the second side wall 13 face each other. The multiple finger valves 21 are lined up along the direction in which the first side wall 12 extends. Specifically, the multiple finger valves 21 are lined up along the front-to-rear direction Y, which is perpendicular to both the opposing direction X and the vertical direction Z. In this embodiment, the finger pump 20 includes five finger valves 21a, 21b, 21c, 21d, and 21e.

Each of the multiple finger valves 21 includes a valve head 21H, a shaft 21S, and a contact roller 21R. The shaft 21S extends along the opposing direction X. The valve head 21H is located at the tip of the shaft 21S. The contact roller 21R is located on the opposite side of the shaft 21S from the valve head 21H. The circumferential surface of an eccentric cam roller 24 abuts against the contact roller 21R.

The base plate 22 sandwiches the medical tubing 2 located outside the housing 10 together with the multiple finger valves 21 at the opening 121. The base plate 22 is located on the opposite side of the second side wall 13 from the multiple finger valves 21 (see Figure 4). In this embodiment, the multiple finger valves 21 are located at the opening 121, and the base plate 22 is located outside the housing 10. Therefore, the portion of the medical tubing 2 attached to the finger pump 20 is located outside the housing 10 (main body 11). Therefore, the medical device 1 according to this embodiment is made smaller overall by incorporating the finger pump 20 within the housing 10, and the medical tubing 2 located outside the medical device 1 can be easily attached to the finger pump 20.

The multiple finger valves 21 may be located inside the housing 10 (main body 11). In this case, the portion of the medical tubing 2 attached to the finger pump 20 may be located inside the housing 10 (main body 11) via the opening 121. The base plate 22 may also be located inside the housing 10 (main body 11).

The rotating shaft 23 is located on the second side wall 13 side when viewed from the multiple finger valves 21 (see Figure 4). The rotating shaft 23 extends in the same direction as the multiple finger valves 21 are arranged.

The multiple eccentric cam rollers 24 are attached to the rotating shaft 23 with their rotational phases offset by a predetermined angle from one another. The multiple eccentric cam rollers 24 abut against each of the multiple finger valves 21. More specifically, the circumferential surfaces of the eccentric cam rollers 24 abut against the abutment rollers 21R of the finger valves 21. In this embodiment, the finger pump 20 includes five eccentric cam rollers 24a, 24b, 24c, 24d, and 24e as the multiple eccentric cam rollers 24. The five eccentric cam rollers 24a, 24b, 24c, 24d, and 24e abut against the abutment rollers 21R of the finger valves 21a, 21b, 21c, 21d, and 21e, respectively.

Motor 25 is specifically a stepping motor. Motor 25 is located on the second side wall 13 side when viewed from rotating shaft 23. Details of the structure of motor 25 will be described later.

The drive shaft 26 extends from the motor 25 and is rotated by the motor 25. Specifically, the drive shaft 26 extends along the front-to-rear direction Y. The drive shaft 26 has a drive shaft body 261 and a drive pulley 262. The drive shaft body 261 is the part that is rotated by the motor 25. The drive pulley 262 is attached to the drive shaft body 261.

The drive belt 27 is wound around the rotating shaft 23 and the drive shaft 26. On the drive shaft 26, specifically, the drive belt 27 is wound around the drive pulley 262. The drive belt 27 extends along the opposing direction X when viewed from the vertical direction Z.

The finger case 28 is indirectly fixed to the first side wall 12 of the housing 10. That is, the position of the finger case 28 relative to the first side wall 12 is fixed. The shaft 21S passes through the finger case 28. A coil spring 21CB is installed between the finger case 28 and the contact roller 21R. The biasing force of the compressed coil spring 21CB constantly presses the finger valve 21 against the eccentric cam roller 24.

The pump cover 29 is configured to be openable and closable. When closed, the pump cover 29 is located on the opposite side of the base plate 22 from the finger valves 21. The base plate 22 is attached to the pump cover 29. Therefore, when the pump cover 29 is closed, the finger pump 20 can transfer the liquid in the medical tube 2. Furthermore, when the pump cover 29 is open, the pump cover 29 is configured so that the base plate 22 is positioned so that it does not face the multiple finger valves 21. Therefore, when the side wall cover 40 is open and the pump cover 29 is open, the medical tube 2 can be attached to and detached from the finger pump 20.

In this embodiment, the base plates 22 of the first finger pump 20A, second finger pump 20B, and third finger pump 20C are all attached to a single pump cover 29.

Here, we will explain how the finger pump 20 transfers liquid within the medical tubing 2. Rotational position control by the motor 25 is transmitted to the rotating shaft 23 via the drive shaft 26 and drive belt 27. The motor 25 then controls the rotational positions of multiple eccentric cam rollers 24a, 24b, 24c, 24d, and 24e attached to the rotating shaft 23, thereby controlling the positions of multiple finger valves 21a, 21b, 21c, 21d, and 21e. This sequentially moves the multiple finger valves 21a, 21b, 21c, 21d, and 21e. Consequently, the medical tubing 2 is sequentially sandwiched between the valve heads 21H of the multiple finger valves 21a, 21b, 21c, 21d, and 21e and the base plate 22. By sequentially blocking the interior of the medical tubing 2 in this manner, the transfer of liquid within the medical tubing 2 can be achieved.

Next, the structure of the motor 25 will be described in detail. Figure 8 is a perspective view showing a portion of a finger pump and a portion of a support unit in one embodiment of the present disclosure. As shown in Figures 4 and 6 to 8, the motor 25 has a motor body 251, a supported body 252, and an extension portion 253.

The motor body 251 is the part that rotates the drive shaft 26. The motor body 251 is located on the second side wall 13 side when viewed from the multiple eccentric cam rollers 24.

The supported member 252 has a plate-like outer shape. The supported member 252 extends in the opposing direction X and the vertical direction Z. The supported member 252 is located on the drive shaft 26 side when viewed from the motor main body 251. When viewed from the vertical direction Z, the supported member 252 is located between the motor main body 251 and the drive pulley 262. The supported member 252 has a first through hole 252a that penetrates in the front-to-rear direction Y. The drive shaft main body 261 is inserted into the first through hole 252a. The supported member 252, together with the motor main body 251, sandwiches a portion of the support unit 30 (described below) in the front-to-rear direction Y. The supported member 252 is connected to the motor 25 by multiple connecting members 252b that extend in the front-to-rear direction Y. The connecting members 252b are not particularly limited, but may be, for example, screw members, specifically bolts.

The extension portion 253 has a plate-like outer shape. The extension portion 253 extends in the front-rear direction Y from the supported body 252. The extension portion 253 is located on the second side wall 13 side of the drive pulley 262. The extension portion 253 has an adjustment through-hole 253a that penetrates in the opposing direction X. The extension portion 253 further has a female thread portion 253b. The female thread portion 253b is, for example, a nut. The female thread portion 253b is located on the first side wall 12 side as viewed from the adjustment through-hole 253a. The female thread portion 253b threadably engages with a part of the support unit 30, which will be described later. The inner surface of the adjustment through-hole 253a may be formed in a female thread shape.

Next, we will explain the support unit 30. The support unit 30 supports the finger pump 20 inside the housing 10.

The support unit 30 includes a shaft support portion 31, a motor support portion 32, a locking portion 33, and a screw member 34. More specifically, the support unit 30 includes a plurality of shaft support portions 31, a plurality of motor support portions 32, a plurality of locking portions 33, and a plurality of screw members 34, each corresponding to a respective one of the plurality of finger pumps 20. However, in this embodiment, the plurality of shaft support portions 31 are connected to each other and comprise a single member. The plurality of motor support portions 32 are connected to each other and comprise a single member. The plurality of locking portions 33 are connected to each other and comprise a single member. In the following description of the support unit 30, the configuration corresponding to one finger pump 20 will be described. In this embodiment, the configuration of the support unit 30 corresponding to the other finger pumps 20 is also similar to the configuration below.

The shaft support portion 31 rotatably supports the rotating shaft 23. The shaft support portion 31 has a plate-like outer shape. The shaft support portion 31 extends along both the opposing direction X and the vertical direction Z. When viewed from the vertical direction Z, the shaft support portion 31 is located between the multiple eccentric cam rollers 24 and the drive belt 27.

The motor support portion 32 has a plate-like outer shape. The motor support portion 32 is connected to the shaft support portion 31. The motor support portion 32 is located on the second side wall 13 side when viewed from the shaft support portion 31. The motor support portion 32 extends along both the opposing direction X and the vertical direction Z. In this embodiment, the motor support portion 32 and the shaft support portion 31 are configured as a single member.

The motor support portion 32 has a second through hole 321 that penetrates in the front-to-rear direction Y. The drive shaft main body 261 is inserted into the second through hole 321. When viewed from the front-to-rear direction Y, the second through hole 321 extends at least in the opposing direction X. The motor support portion 32 has a plurality of third through holes 323 that penetrate in the front-to-rear direction Y. A plurality of connecting members 252b are inserted into each of the third through holes 323. When viewed from the front-to-rear direction Y, the third through holes 323 extend along the opposing direction X. The connecting members 252b are engaged with the third through holes 323, respectively, so as to be slidable in the opposing direction X.

As described above, the supported member 252 of the motor 25 is supported by the motor support portion 32 by sandwiching the motor support portion 32 together with the motor body 251. More specifically, the third through-holes 323 of the motor support portion 32 support each connecting member 252b so that it can slide in the opposing direction X. In this way, the motor support portion 32 supports the motor 25 so that it can move along the opposing direction in which the first side wall 12 and the second side wall 13 face each other.

The interlocking portion 33 has a plate-like outer shape. The interlocking portion 33 is connected to the motor support portion 32. In this embodiment, the interlocking portion 33 extends from the motor support portion 32 in the front-to-rear direction Y.

The interlocking portion 33 is located on the second side wall 13 side when viewed from the motor 25. In this embodiment, the interlocking portion 33 is located alongside the extension portion 253 in the facing direction X. The interlocking portion 33 is located closer to the second side wall 13 than to the first side wall 12 (see Figure 4).

The locked portion 33 has a (fourth) through-hole 331 that penetrates in the opposing direction. The screw member 34 is inserted into the through-hole 331 from the second side wall 13 side and is engaged with the locked portion 33.

The threaded member 34 is threadedly engaged with the motor 25. Specifically, the extension portion 253 of the motor 25 is threadedly engaged with the threaded member 34. In this embodiment, the specific configuration of the threaded member 34 is not particularly limited, but the threaded member 34 is a fine thread, specifically a bolt. In this embodiment, the threaded member 34 consists of a rod-shaped male threaded portion 341 and a head portion 342 located at the tip of the male threaded portion 341. The male threaded portion 341 is inserted through the (fourth) through hole 331 and the adjustment through hole 253a. The head portion 342 is located on the opposite side of the engaging portion 33 from the extension portion 253 (i.e., on the second side wall 13 side). In this embodiment, the male threaded portion 341 and the female threaded portion 253b of the extension portion 253 of the motor 25 are threadedly engaged with each other. If the inner surface of the adjustment through-hole 253a is formed with a female thread, the male thread portion 341 and the adjustment through-hole 253a of the extension portion 253 of the motor 25 may be threaded together.

A specific method for adjusting the drive belt 27 of the finger pump 20 in the medical device 1 according to this embodiment will now be described. First, the second side wall 13 is removed from the main body 11 (see Figure 6). Then, the head 342 of the threaded member 34 is rotated. For example, by rotating the head 342 (and the male threaded portion 341) so that the head 342 and the female threaded portion 253b approach each other, the extension portion 253 of the motor 25 approaches the engaging portion 33. Consequently, the motor 25 moves away from the rotating shaft 23, which is supported by the shaft support portion 31 of the support unit 30. This increases the separation distance between the rotating shaft 23 and the drive shaft 26 in the opposing direction X. This therefore increases the tension of the drive belt 27 wound around the rotating shaft 23 and the drive shaft 26. On the other hand, when the head 342 (and the male thread 341) is rotated so that the head 342 and the female thread 253b move away from each other, the extension 253 of the motor 25 moves away from the locked portion 33. Consequently, the motor 25 moves closer to the rotating shaft 23, which is journaled on the shaft support portion 31 of the support unit 30. This reduces the distance between the rotating shaft 23 and the drive shaft 26 in the opposing direction X. This reduces the tension in the drive belt 27 wound around the rotating shaft 23 and the drive shaft 26.

As described above, in the medical device 1 according to one embodiment of the present disclosure, the second side wall 13 is provided on the main body 11 on the side opposite the first side wall 12. The second side wall 13 is detachably provided on the main body 11. The motor 25 is located on the second side wall 13 side when viewed from the rotating shaft 23. The drive shaft 26 extends from the motor 25 and is rotated by the motor 25. The drive belt 27 is wound around the rotating shaft 23 and the drive shaft 26. The shaft support portion 31 rotatably supports the rotating shaft 23. The motor support portion 32 is connected to the shaft support portion 31. The motor support portion 32 supports the motor 25 movably along the opposing direction X in which the first side wall 12 and the second side wall 13 oppose each other. The interlocking portion 33 is connected to the motor support portion 32. The interlocking portion 33 is located on the second side wall 13 side when viewed from the motor 25. The locked portion 33 has a through hole 331 that penetrates in the opposing direction. The screw member 34 is inserted into the through hole 331 from the second side wall 13 side and is locked to the locked portion 33. The screw member 34 screws into the motor 25.

With the above configuration, an operator can remove the second side wall 13 from the main body 11 and rotate the threaded member 34 from the side opposite the first side wall 12 without removing the finger pump 20 from the housing 10. By rotating the threaded member 34, the motor 25 is displaced relative to the shaft support portion 31 in the opposing direction X. As a result, by rotating the threaded member 34, the tension of the drive belt 27 can be increased or decreased. This allows the operator to easily adjust the tension of the drive belt 27 of the finger pump 20.

In one embodiment of the present disclosure, the engaging portion 33 is located closer to the second side wall 13 than to the first side wall 12.

With the above configuration, when the worker removes the second side wall 13 from the main body 11, the distance from the outside of the housing 10 to the threaded member 34 that engages with the engaged portion 33 becomes shorter. This makes it easier to adjust the tension of the drive belt 27 by rotating the threaded member 34.

In one embodiment of the present disclosure, no other components are located between the support unit 30 and the second side wall 13.

With the above configuration, when an operator removes the second side wall 13 from the main body 11 and rotates the threaded member 34 of the support unit 30 from outside the housing 10, the need for additional work, such as removing other components from the main body 11, is reduced. This makes it even easier to adjust the tension of the drive belt 27 of the finger pump 20.

In one embodiment of the present disclosure, the drive shaft 26 has a drive shaft body 261 and a drive pulley 262. The drive shaft body 261 is rotated by the motor 25. The drive pulley 262 is attached to the drive shaft body 261. A drive belt 27 is wound around the drive pulley 262. The motor 25 has a motor body 251, a supported member 252, and an extension 253. The motor body 251 rotates the drive shaft 26. The supported member 252 is located on the drive shaft 26 side as viewed from the motor body 251. The supported member 252 is supported on the motor support portion 32 by sandwiching the motor support portion 32 together with the motor body 251. The extension 253 extends from the supported member 252. The extension 253 is located on the second side wall 13 side of the drive pulley 262 and threadedly engages with the threaded member 34. The engaged portion 33 is positioned alongside the extending portion 253 in the opposing direction.

With the above configuration, the drive pulley 262, extension 253, and latched portion 33 are aligned in the opposing direction, so an operator looking inside the main body 11 with the second side wall 13 removed can intuitively recognize that the belt tension is adjusted by the threaded member 34 latching onto the latched portion 33. This makes adjusting the tension of the pump drive belt 27 even easier.

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 Medical tubing, 2A First medical tubing, 2B Second medical tubing, 2C Third medical tubing, 3 Blood purifier, 3a Dialysis fluid inlet, 3b Drainage outlet, 3c Blood inlet, 3d Blood outlet, 4 Supply source, 5 Arterial blood circuit, 5a Arterial air trap chamber, 5b Blood pump, 6 Venous blood circuit, 6a Venous air trap chamber, 7a First connecting pipe, 7b First measuring bag, 7c Second connecting pipe, 7d Second measuring bag, 8 Scale, 10 Housing, 11 Main body, 12 First side wall, 121 Opening, 13 Second side wall, 20 Finger pump, 20A First finger pump, 20B Second finger pump, 20C Third finger pump, 201 Frame, 21, 21a, 21b, 21c, 21d, 21e Finger valve, 21CB coil spring, 21H valve head, 21R contact roller, 21S shaft, 22 base plate, 23 rotating shaft, 24, 24a, 24b, 24c, 24d, 24e eccentric cam roller, 25 motor, 251 motor body, 252 supported member, 252a first through hole, 252b connecting member, 253 extension portion, 253a adjustment through hole, 253b female thread portion, 26 drive shaft, 261 drive shaft body, 262 drive pulley, 27 drive belt, 28 finger case, 29 pump cover, 30 support unit, 31 shaft support portion, 32 motor support portion, 321 second through hole, 323 third through hole, 33 engaged portion, 331 through hole, 34 screw member, 341 Male thread part, 342 head, 40 side wall cover.

Claims (4)

A medical device comprising: a housing; a finger pump incorporated in the housing; and a support unit that supports the finger pump inside the housing,
The housing includes:
a main body that accommodates at least a portion of the finger pump;
a first sidewall provided on the main body portion and having an opening;
a second side wall provided on the main body portion opposite to the first side wall and detachably provided to the main body portion,
The finger pump comprises:
a plurality of finger valves extending from inside the main body portion toward the opening and aligned along an extension direction of the first side wall;
a base plate that sandwiches a medical tube located outside the housing together with the plurality of finger valves at the opening;
a rotating shaft located on a second sidewall side as viewed from the plurality of finger valves;
a plurality of eccentric cam rollers attached to the rotary shaft with their rotational phases shifted by a predetermined angle from one another and abutting against the plurality of finger valves, respectively;
a motor located on the second sidewall side as viewed from the rotary shaft;
a drive shaft extending from the motor and rotated by the motor;
a drive belt wound around the rotary shaft and the drive shaft,
The support unit includes:
a shaft support portion that rotatably supports the rotary shaft;
a motor support portion connected to the shaft support portion and supporting the motor movably along an opposing direction in which the first side wall and the second side wall oppose each other;
a locked portion connected to the motor support portion, located on the second sidewall side as viewed from the motor, and having a through hole penetrating in the opposing direction;
a screw member that is inserted into the through hole from the second side wall side and that engages with the locked portion while screwing into the motor; The medical device according to claim 1, wherein the engaging portion is located closer to the second side wall than to the first side wall. The medical device of claim 1, wherein no other components are located between the support unit and the second side wall. The drive shaft is
a drive shaft body rotated by the motor;
a drive pulley attached to the drive shaft body and around which the drive belt is wound,
The motor
a motor body that rotates the drive shaft;
a supported member located on the drive shaft side as viewed from the motor body, and supported by the motor support portion by sandwiching the motor support portion together with the motor body;
an extension portion extending from the supported object, positioned on a second side wall side of the drive pulley, and threadedly engaging with the threaded member;
The medical device according to claim 1 , wherein the engagement portion is positioned alongside the extension portion in the opposing direction.