JP7367299B2 - Medical suction liquid collection device and spring member for medical equipment - Google Patents

Description

The present invention relates to a medical suction liquid collecting device that sucks liquid into a reservoir by inflating the reservoir with an expansion mechanism, and a medical device spring member provided in the medical device.

BACKGROUND ART During surgery or the like, liquids such as blood, pus, and exudate may be discharged from the body, and it is necessary to aspirate these liquids. An example of a device having such a function is a medical suction liquid collection device, and one example of such a device is a surgical suction device described in Patent Document 1.

The surgical suction device of U.S. Pat. No. 5,300,300 includes two plates disposed within an inflatable reservoir. The two plates are placed one on top of the other with both end portions connected to each other, and a spring is placed between them. The spring biases the intermediate portions of the two plates apart from each other. On the other hand, the two plates are provided with latches to prevent them from separating from each other. The latch has latch hooks provided on each of the two plates, and the two plates are maintained in close proximity by engaging the latch hooks with each other. Furthermore, when the latch hook is disengaged, the intermediate portions of the two plates are pulled apart by the spring. Thereby, the reservoir can be expanded to create a negative pressure inside the reservoir, and by creating the negative pressure, liquid can be sucked into the reservoir.

Special Publication No. 2-49747

BACKGROUND ART During surgery, a nuclear magnetic resonance imaging device, ie, an MRI device, is sometimes used to image the inside of a patient's living body during surgery, and it is desirable to pass a surgical suction device through the MRI device together with the patient. However, the spring member used in the surgical suction device described in Patent Document 1 is made of a metal wire in order to achieve a desired suction force. Therefore, when the surgical suction device is passed through the MRI device, a force is generated against the surgical suction device such that it is attracted by the magnetic generating part of the MRI device, and the surgical suction device starts to move in an unintended direction. During surgery, it is undesirable for the surgical suction device to move. Therefore, the surgical suction device of Patent Document 1 cannot be used in MRI.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a medical suction liquid collection device and a medical device spring member that can be used in devices that generate magnetism such as MRI devices.

The medical suction liquid collection device of the present invention includes a resin reservoir having a suction port and capable of sucking liquid from the suction port and storing it therein by expanding; and a resin reservoir housed in the reservoir; an expansion mechanism that expands the reservoir to suck liquid from the suction port; a pair of plates that can be expanded away from the other plate in the thickness direction; and a pair of plates that is disposed between the pair of plates and biases the at least a portion of the one plate to separate the plate from the other plate. The spring member is switchable between a locked state in which the at least part of the plate is locked to prevent it from separating from the other plate, and a released state in which the at least part of the one plate is allowed to separate from the other plate. The pair of plates are made of resin, and the spring member is made of a non-magnetic material.

According to the present invention, since the pair of plates are made of synthetic resin and the spring member is made of a non-magnetic material, it is possible to suppress the expansion mechanism from being attracted to the magnetism generating portion in a device that generates magnetism such as an MRI device. be able to. This allows the medical suction fluid collection device to be used even in treatments that use devices that generate magnetism, such as MRI devices.

The medical suction liquid collection device of the present invention includes a resin reservoir having a suction port and capable of sucking liquid from the suction port and storing the liquid therein by expanding; , an expansion mechanism that expands the reservoir to suck liquid from the suction port, the expansion mechanism being made of a non-magnetic material, and a spring member for expanding the reservoir; It has a locking portion that releasably keeps the spring member in a compressed state.

According to the present invention, in a device that generates magnetism such as an MRI device, it is possible to suppress the expansion mechanism from being attracted to the magnetism generating portion. This allows the medical suction fluid collection device to be used even in treatments that use devices that generate magnetism, such as MRI devices.

The spring member for a medical device of the present invention is provided in a medical device, and is formed into a substantially truncated cone shape so that the windings do not overlap each other when viewed from one side in the axial direction, and has a magnetic permeability of 1.01 or less. This is a compression coil spring made of non-magnetic wire.

According to the present invention, since the spring member for a medical device is made of a non-magnetic wire as described above, even if it is a compression coil spring, in a device that generates magnetism such as an MRI device, the magnetism generating portion is used for the medical device. It is possible to suppress the spring member from being drawn. As a result, it is possible to manufacture a medical device that can be used even in treatments that use a device that generates magnetism, such as an MRI device, even if it includes a spring member.

According to the present invention, it is possible to provide a medical suction liquid collection device and a medical device spring member that can be used in a device that generates magnetism such as an MRI device.

It is a front view showing a drain bag of an embodiment concerning the present invention. 2 is a perspective view showing an expansion mechanism included in the drain bag of FIG. 1. FIG. FIG. 3 is a perspective cross-sectional view of the expansion mechanism of FIG. 2 when opened and cut along an imaginary plane located at the center in the width direction. 3 is a perspective view showing a bottom plate included in the expansion mechanism of FIG. 2. FIG. 3 is a perspective view showing a top plate included in the expansion mechanism of FIG. 2. FIG. 4A and 4B are drawings showing the spring member of FIG. 3, in which (a) is a perspective view and (b) is a side view. 3 is a cross-sectional view showing the expansion mechanism in FIG. 2, (a) is a cross-sectional view taken along cutting line VIIA-VIIA in FIG. 2, and (b) is a cross-sectional view taken along cutting line VIIB-VIIB in FIG. 2. be. 7(a) is a sectional view corresponding to FIG. 7(a), and FIG. 7(b) is a sectional view corresponding to FIG. 7(b); FIG. It is.

EMBODIMENT OF THE INVENTION Hereinafter, the drain bag 1 of embodiment based on this invention is demonstrated with reference to drawings. Note that the concept of direction used in the following explanation is used for convenience in explanation, and does not limit the orientation of the structure of the invention to that direction. Moreover, the drain bag 1 described below is only one embodiment of the present invention. Therefore, the present invention is not limited to the embodiments, and additions, deletions, and changes can be made without departing from the spirit of the invention.

<Drain bag>
Blood, pus, exudate, etc. (hereinafter referred to as "blood, etc.") may be discharged from the body during surgery, etc., and a drain bag 1 as shown in FIG. 1 is used to aspirate the discharged blood. It will be done. The drain bag 1, which is a medical suction liquid collection device, can suck blood and the like and store the sucked blood and the like. Further, the drain bag 1 is made of a material that can be passed through a device that generates magnetism such as a nuclear magnetic resonance imaging device, that is, an MRI device, and can also be used during surgery using an MRI device or the like. A drain bag 1 having such functions includes a bag body 2 and an expansion mechanism 3.

The bag body 2, which is an example of a reservoir, is a rectangular bag body when viewed from the front, and is composed of a pair of sheets 11, 11. More specifically, the pair of sheets 11, 11 are made of transparent or semi-transparent synthetic resin and are formed into a generally rectangular shape. The pair of sheets 11, 11 are formed in substantially the same shape, and the outer peripheral edge portions of each sheet are welded over substantially the entire circumference while being overlapped with each other. As a result, a bag-shaped bag main body 2 having a storage space 2a therein is formed. The bag main body 2 has a mounting hole 2b at one end in the longitudinal direction, and is configured to be able to be hung by attaching a hanging device such as a hook (not shown) to the mounting hole 2b. Furthermore, an inlet port 2c and an outlet port 2d are formed at one end in the longitudinal direction of the bag main body 2 so as to be spaced apart in the width direction, with a mounting hole 2b sandwiched therebetween.

Tubes 12 and 13 are inserted diagonally into the two openings 2c and 2d, respectively, and the pair of sheets 11 are welded with the tubes 12 and 13 inserted into the openings 2c and 2d, respectively. . The two pipes 12 and 13 communicate the storage space 2a with the outside of the bag body 2, and one of them, the suction pipe 12, is used when sucking blood etc. toward the storage space 2a. The other discharge pipe 13 is used to discharge blood and the like from the storage space 2a. Note that blood or the like is an example of a liquid that is sucked into and discharged from the bag body 2, and the liquid that is sucked and discharged is not limited to blood or the like.

When the bag main body 2 configured as described above is used, the proximal end of a catheter (not shown) is connected to the suction tube 12, and the tip of the catheter is immersed in blood or the like to be discharged outside the body. The bag body 2 is in a thin and flat state before use, and by inflating it, it is possible to create a negative pressure in the storage space 2a. By creating a negative pressure, blood and the like are sucked from the tip of the catheter through the suction tube 12 into the storage space 2a, and the sucked blood and the like are collected in the storage space 2a. In this way, the drain bag 1 can collect liquid by inflating the bag body 2, and the expansion mechanism 3 is installed inside the bag body 2, that is, in the storage space 2a, in order to inflate the bag body 2. It is accommodated.

In the initial state, the expansion mechanism 3 is housed in the bag body 2 in a contracted state as shown in FIG. 2, and by performing an expansion operation described later, it becomes an expanded state as shown in FIG. Expand 2. The expansion mechanism 3 having such a function includes a pair of plates 21 and 22 and a coil spring 23, as shown in FIGS. 2 and 3. The bottom plate 21, which is one of the pair of plates 21 and 22, is made of synthetic resin, such as polypropylene, polyvinyl chloride, polycarbonate, or the like. Further, the bottom plate 21 is formed into a generally rectangular shape as shown in FIG. 4, and has an intermediate portion 31 and both end portions 32 and 33. The three portions 31 to 33 are lined up in the longitudinal direction of the bottom plate 21, and the ends of the adjacent portions 31 to 33 are integrally connected to each other via the bent portions 34L and 34R. The bent portions 34L and 34R are formed thinner than the respective portions 31 to 33, for example. Therefore, the end portions 32 and 33 are bent toward one side and the other side in the thickness direction of the bottom plate 21 with respect to the intermediate portion 31 at the bending portions 34L and 34R, respectively.

Further, one of the end portions 32 and 33, that is, the one end portion 32 located on one side in the longitudinal direction is formed into a roughly trifurcated shape when viewed from the front, with a trifurcated central portion 32a and both side portions. Reinforcing plates 32d and 32e are bridged between each of 32b and 32c at their tip sides. Each of the reinforcing plates 32d and 32e is curved so as to be recessed relative to the main surface of the one end portion 32 (that is, the main surface of the bottom plate 21). Furthermore, a connecting hole 32f is formed at the tip of the three-pronged central portion 32a. The other end portion 33 located on the other side in the longitudinal direction of the both end portions 32 and 33 is a tip portion (i.e., an end portion located on the opposite side to the intermediate portion 31 and an outer end portion 33). ) are formed with a pair of hinge pins 33a, 33a. The pair of hinge pins 33a, 33a are formed in a substantially cylindrical shape and are spaced apart in the width direction. Further, in the other end side portion 33, a through groove 33b is formed at a position adjacent to the hinge pin 33a.

The top plate 22, which is the other plate 22, is placed on the main surface of the bottom plate 21 configured in this manner so as to overlap, and both ends of each plate are connected to each other in this state. Below, the configuration of the top plate 22 will be explained in more detail with reference to FIG. 5. The top plate 22 is made of synthetic resin, such as polypropylene, polyvinyl chloride, polycarbonate, or the like. Also. The top plate 22 is formed into a generally rectangular shape, and its outer edge shape is approximately the same as the bottom plate 21 . That is, the top plate 22 also has an intermediate portion 35 and both end portions 36 and 37 arranged side by side in the longitudinal direction, and these three portions 35 to 37 have bent portions 38L and 38R interposed therebetween. They are integrally connected. Furthermore, the bent portions 38L and 38R are formed thinner than the respective portions 35 to 37, and the both end portions 36 and 37 have a thickness that is equal to the thickness of the top plate 22 with respect to the intermediate portion 35 from the bent portions 38L and 38R. It can be bent in one direction and the other.

Further, one of the both end portions 36 and 37 of the top plate 22, that is, the one end portion 36 on one side in the longitudinal direction is also formed into a roughly trifurcated shape when viewed from the front. Reinforcing plates 36d and 36e are bridged between the three-pronged central portion 36a and both side portions 36b and 36c on their tip sides, and each reinforcing plate 36d and 36e is connected to the main surface of the one end side portion 36. (That is, the surface constituting the main surface of the top plate 22) is curved so as to be recessed. These reinforcing plates 36d, 36e are opposed to the reinforcing plates 32d, 32e of the bottom plate 21 in a state where the pair of plates 21, 22 are overlapped, as shown in FIG. Insertion holes 3a and 3b are formed. The two tubes 12 and 13 are configured to be inserted into the insertion holes 3a and 3b.

Further, a connecting hole 36f is formed at a position corresponding to the connecting hole 32f of the bottom plate 21 at the tip of the three-pronged central portion 36a. Binding bands (not shown) are inserted through these two connection holes 32f, 36f, and the tips of the one end portions 32, 36 of each plate 21, 22 are bound (i.e., connected) by the binding bands. ). As a result, the one end portions 32 and 36 can be swung apart from each other in the thickness direction using the binding band as a base point.

Further, a pair of hinge hooks 37a, 37a are formed at the tip of the other of the both end portions 36, 37, that is, the other end portion 37 located on the other side in the longitudinal direction. are spaced apart in the width direction. Further, the pair of hinge hooks 37a, 37a are formed in a substantially semi-cylindrical shape, and each hinge hook 37a has a recess 37b. The recess 37b is open to the other side in the thickness direction (that is, the direction in which the reinforcing plates 36d and 36e are recessed). The pair of hinge hooks 37a, 37a formed in this way are arranged corresponding to the pair of hinge pins 33a, 33a and the through groove 33b in the bottom plate 21, and are inserted into the corresponding through groove 33b from one side in the thickness direction. (See FIG. 3), the hinge pin 33a is rotatably engaged in the recess 37b. As a result, the tips of the other end portions 33, 37 of each plate 21, 22 are also connected, and the other end portions 33, 37 are swung apart from each other in the thickness direction with the hinge pin 33a as a base point. I can do it.

The pair of plates 21 and 22 configured in this manner are stacked on top of each other with the main surfaces of the intermediate portions 31 and 35 facing each other. Further, in the pair of plates 21, 22, one end side portions 32, 36 are connected to each other by a binding band, and the other end side portions 33, 37 are connected by corresponding hinge pins 33a, 33a and hinge hooks 37a, 37a. . Thereby, the pair of plates 21, 22 can be opened from the connected portions of the one end side portions 32, 36 and the other end side portions 33, 37, that is, the adjacent intermediate portions 31, 35 can be opened. It can be separated as shown in FIG. In the pair of plates 21 and 22 configured in this manner, a coil spring 23 is interposed between the intermediate portions 31 and 35 in order to separate the intermediate portions 31 and 35, that is, to enable expansion of the expansion mechanism 3.

The coil spring 23 is a so-called compression coil spring, and is formed into a substantially truncated cone shape as shown in FIGS. 6(a) and 6(b). To explain in more detail, the coil spring 23 is a compression coil spring with, for example, about 5 to 10 turns depending on the suction pressure of the drain bag 1. In this embodiment, a compression coil spring with 7 turns is used. is used. By increasing the number of turns, the pitch can be narrowed and the load acting on the plates 21 and 22 can be suppressed. In addition, in FIG. 3, for convenience of explanation, a compression coil spring with a small number of turns is shown. The coil spring 23 formed in this manner has one end portion formed with a larger diameter than the other end portion, and the diameter decreases as it progresses from the one end portion side to the other end portion. Further, the coil spring 23 is wound so that its windings do not overlap each other when viewed from the front (that is, from one side or the other side in the axial direction of the coil spring 23) (see the two-dot chain line in FIG. 6(b)). , by applying a load that brings one end and the other end close to each other, it can be compressed into a flat state. The coil spring 23 configured as described above is made of the following wire material.

That is, the coil spring 23 is made of a non-magnetic wire, and is prevented from being attracted to a magnetism generating part in a device that emits magnetism, such as an MRI device. To explain in more detail, the coil spring 23 is made of a non-magnetic steel wire with a magnetic permeability of 1.01 or less at a processing rate of 60% or more, and even when the steel wire is processed into the coil spring 23, there is no non-magnetic steel wire. It is configured to be magnetic. In this embodiment, a non-magnetic stainless steel wire such as NAS106N is used as the steel wire, but a material such as NASNM15N may also be used. By using such a steel wire, even if the coil spring 23, that is, the drain bag 1 is brought close to a device that generates magnetism, such as an MRI device, it can be prevented from being attracted to the magnetism generating portion. Therefore, the drain bag 1 can also be used in treatments using an MRI apparatus. The coil spring 23 configured in this manner is interposed between the intermediate portions 31 and 35 as described above, and the intermediate portions 31 and 35 are constructed as follows in order to interpose the coil spring 23 between them. It is composed of

In the intermediate portion 31 of the bottom plate 21, a recess 31a is formed in the main surface of the intermediate portion 31, as shown in FIG. The recess 31a is formed in a generally circular shape when viewed from the front, and the inner diameter of the recess 31a substantially matches the outer diameter of one end portion of the coil spring 23. As shown in FIG. 3, one end portion of the coil spring 23 is accommodated in the recess 31a having such a shape. Further, a protruding piece 31c that protrudes radially inward is formed on the inner circumferential surface of the recess 31a, and the base end of the winding of the coil spring 23 is brought into contact with the protruding piece 31c to prevent rotation of the coil spring 23. There is. On the other hand, a convex portion 35a is formed on the main surface of the intermediate portion 35 of the top plate 22. The outer diameter of the convex portion 35a substantially matches the inner diameter of the other end portion of the coil spring 23, and the other end portion of the coil spring 23 is covered with the convex portion 35a. In this way, the coil spring 23 has one end portion inside the recess 31a and the other end portion outside the convex portion 35a, so that the coil spring 23 is placed between the intermediate portions 31 and 35 of the pair of plates 21 and 22. is attached to.

The coil spring 23 attached in this manner biases the intermediate portions 31 and 35 of the pair of plates 21 and 22 apart from each other, and the expansion mechanism 3 is moved as shown in FIG. 3 by the biasing force of the coil spring 23. It is expanded as shown. On the other hand, the expansion mechanism 3 can be returned to the flat state as shown in FIG. 2 by applying a load that resists the biasing force of the coil spring 23 (i.e., contracting), and the expansion mechanism 3 can be returned to the flat state as shown in FIG. A main lock mechanism 40 and a pair of sub-lock mechanisms 41, 41 are formed on the pair of plates 21, 22.

As shown in FIG. 3, the main locking mechanism 40, which is an example of a locking portion, is provided near the center of the intermediate portions 31 and 35 of the pair of plates 21 and 22 (that is, near the center of the recess 31a and the protrusion 35a). Therefore, the intermediate portions 31 and 35 can be locked so that they do not separate from each other. A pair of main lock mechanisms 40 having such a function include a bottom side engagement block 42 and a top side engagement block 43. The bottom-side engagement block 42, which is one of the pair of engagement parts, is formed in the recess 31a of the bottom plate 21, as shown in FIG. It is formed at a position corresponding to the bottom side engagement block 42, that is, on the convex portion 35a of the top plate 22.

To explain in more detail, a through hole 31b is formed in the center of the recess 31a of the bottom plate 21 (see FIG. 4), and the bottom side engagement block 42 is adjacent to the through hole 31b on the other side in the longitudinal direction. It is arranged to let. The bottom side engagement block 42 arranged in this way is formed in a roughly hook shape when viewed from the side, that is, it protrudes from the bottom surface of the recess 31a in one direction in the thickness direction, and its tip 42a extends in one direction in the longitudinal direction. It's bent like that. Further, a through hole 35b is formed at the center of the convex portion 35a of the bottom plate 21 (see FIG. 5), and a stepped portion adjacent to the through hole 35b is provided to form a top side engagement block 43. 35d is formed. The step portion 35d is located on one side in the longitudinal direction of the through hole 35b, and the top side engagement block 43 protrudes from the step portion 35d in the other direction in the thickness direction from the main surface of the intermediate portion 35, and its tip portion 43a is located on one side in the longitudinal direction. It is bent to extend to the other side (see also Figure 3). That is, the top side engagement block 43 is also formed in a roughly hook shape like the bottom side engagement block 42. The top side engagement block 43 formed in this way is formed wider than the through hole 35b, and both end portions 43b and 43c in the width direction are formed integrally with the convex portion 35a (see FIG. 5). .

In the main locking mechanism 40 configured in this way, when the pair of plates 21 and 22 are brought close together until they become flat, the tips 42a and 43a of the two blocks 42 and 43 can be engaged with each other. By engaging in this manner, the pair of plates 21 and 22 can be locked against the urging force of the coil spring 23, and the expansion mechanism 3 can be maintained in a flat state. By the way, in the expansion mechanism 3, as shown in FIG. 4, the bottom plate 21 is formed thin in the recess 31a, and a through hole 31b is further formed in the recess 31a. Therefore, in the bottom plate 21, the area around the through hole 31b is more easily deformed than the remaining portion. Therefore, a bridge (i.e., a rib) 44 is provided in the longitudinal direction of the through hole 31b to increase the rigidity around the through hole 31b. Further, as shown in FIG. 5, the top side engagement block 43 is formed with an accommodation recess 45 at a position corresponding to the bridge 44, and when the two blocks 42 and 43 are engaged, the accommodation recess 45 The bridge 44 can be inserted and accommodated. This makes it possible to lock the pair of plates 21 and 22 in a flat state while improving the rigidity of the bottom plate 21 and suppressing deformation of the bottom plate 21. Further, in addition to the main lock mechanism 40, a pair of sub-lock mechanisms 41, 41 are also formed on the pair of plates 21, 22 in order to further suppress local deformation of the bottom plate 21. In this way, deformation is suppressed by devising the shape, so the possibility of problems occurring during use is reduced without providing a reinforcing member such as a metal plate.

The pair of sub-lock mechanisms 41, 41, like the main lock mechanism 40, lock the intermediate portions 31, 35 so that they do not separate from each other. A pair of sub-lock mechanisms 41, 41 having such a function are provided in the intermediate portions 31, 35 apart from each other in the width direction, and the main lock mechanism 40 is located between them, and They are arranged so that they have mirror symmetry. That is, the three locking mechanisms 40, 41, 41 are arranged so as to be lined up in the width direction in the intermediate portions 31, 35. Each of the pair of sub-lock mechanisms 41, 41 arranged in this manner has a bottom side engagement piece 51 and a top side engagement piece 52.

As shown in FIG. 4, the pair of bottom-side engagement pieces 51, 51 are formed on the main surface of the intermediate portion 31 on the radially outer side of the recess 31a, and the bottom-side engagement block 42 is formed between them. They are placed apart so that they are located. More specifically, in the intermediate portion 31 of the bottom plate 21, through grooves 31d, 31d correspond to the respective bottom-side engaging pieces 51, 51 at positions radially outward of the recess 31a and spaced apart from each other in the width direction. The bottom side engaging pieces 51, 51 are arranged adjacent to the other longitudinal side of the corresponding through grooves 31d, 31d. The pair of bottom-side engagement pieces 51, 51 arranged in this manner are arranged side by side with an interval in the width direction from the bottom-side engagement block 42, and are generally referred to as the bottom-side engagement block 42 when viewed from the side. are arranged so that they overlap. That is, the bottom side engaging piece 51 is formed so as to protrude from the main surface of the intermediate portion 31 in one direction in the thickness direction, and further extends in one side in the longitudinal direction so that its tip 51a protrudes into the corresponding through groove 31d. There is. Note that the bottom-side engagement piece 51 is formed to be slightly shorter in the longitudinal direction than the bottom-side engagement block 42 when viewed from the side. Further, top plate 22 has top side engagement pieces 52, 52 formed at positions corresponding to the bottom side engagement pieces 51, 51, respectively.

The pair of top-side engaging pieces 52, 52 are formed on the main surface of the intermediate portion 35 at the outer peripheral edge portion in the width direction, corresponding to each of the pair of bottom-side engaging pieces 51, 51, and are arranged between them. They are spaced apart so that the top side engagement block 43 is located at. To explain in more detail, the intermediate portion 35 of the top plate 22 is also formed with through grooves 35c, 35c at the outer peripheral edge portion in the width direction, corresponding to the respective top side engaging pieces 52, 52, The engaging pieces 52, 52 are also arranged adjacent to one longitudinal side of the corresponding through grooves 35c, 35c. The pair of top-side engagement pieces 52, 52 arranged in this manner are arranged side by side with an interval in the width direction from the top-side engagement block 43, and are approximately the same as the top-side engagement block 43 when viewed from the side. are arranged so that they overlap. That is, the top side engaging piece 52 is formed into a roughly hook shape when viewed from the side, protrudes from the main surface of the intermediate portion 31 in the other direction in the thickness direction, and has a tip portion 52a bent so as to extend in the other direction in the longitudinal direction. ing. Note that the top-side engagement piece 52 is also formed to be shorter in the longitudinal direction than the top-side engagement block 43 when viewed from the side.

In the pair of sub-lock mechanisms 41, 41 configured in this way, similarly to the main lock mechanism 40, the intermediate portions 31, 35 of each are moved closer together until the pair of plates 21, 22 are both in a flat state. Then, the tips of the corresponding engagement pieces 51 and 52 can be engaged with each other. By engaging in this manner, the pair of plates 21, 22 are locked by the pair of sub-lock mechanisms 41, 41 in addition to the main lock mechanism 40, as shown in FIGS. 7(a) and (b), i.e. The locking mechanisms 40, 41, 41 can be placed in a locked state. Note that in FIGS. 7A and 7B, the coil spring 23 is omitted for convenience of explanation. The same applies to FIGS. 8(a) and 8(b), which will be described later. By locking in this manner, the expansion mechanism 3 is maintained in a flat state. Further, in the expansion mechanism 3, the pair of plates 21 and 22 can be unlocked, that is, the lock mechanisms 40, 41, and 41 can be switched to the unlocked state by the following procedure.

That is, the expansion mechanism 3 grips both end portions 3c and 3d and bends them in mutually different directions in the thickness direction, that is, in one direction and in the other direction, respectively. The one end portion 3c of the expansion mechanism 3 is constituted by the one end portions 32 and 36 of the pair of plates 21 and 22, and is bent toward the bottom plate 21 using the bending portions 34L and 38L as base points. On the other hand, the other end portion 3d of the expansion mechanism 3 is constituted by the other end portions 33, 37 of the pair of plates 21, 22, and, for example, the other end portion 3d is formed from the top with the bent portions 34R, 38R as base points. Fold it toward the plate 22 side. Then, as shown in FIGS. 8(a) and 8(b), the top plate 22 and the bottom plate 21 slide in different directions in the longitudinal direction. Then, since the engaging pieces 51 and 52 are formed to be shorter in the longitudinal direction than the blocks 42 and 43, the engagement between the engaging pieces 51 and 52 is eventually released (see FIG. 8(a)). If the slide is continued after that, the engagement between the two engagement blocks 42 and 43 is released (see FIG. 8(b)). This switches the locked state of all the locking mechanisms 40, 41, 41 to the released state. Then, the intermediate portions 31 and 35 of the pair of plates 21 and 21 are allowed to separate, that is, the expansion mechanism 3 is expanded by the coil spring 23. Then, the expansion mechanism 3 expands to a fully open state in which the coil spring 23 is substantially fully expanded, and then the expansion mechanism 3 stops expanding.

The expansion mechanism 3 having such a function is housed in the bag body 2 in a flat state before use, and the insertion holes 3a and 3b of the expansion mechanism 3 are oriented toward the suction port 2c and the discharge port 2d, respectively. It is being used. As described above, the tubes 12 and 13 are inserted into the suction port 2c and the discharge port 2d, respectively, and the inserted tubes 12 and 13 are inserted into the insertion holes 3a and 3b. In addition, in the expansion mechanism 3, the reinforcing plates 32d, 32e, 36e, and 36d are formed by curving, so that when the expansion mechanism 3 is expanded, the tubes 12 and 13 inserted into the insertion holes 3a and 3b are inserted into the reinforcing plates 32d, 32e, 36e, and 36d to prevent it from being crushed.

In the drain bag 1 configured in this manner, the expansion mechanism 3 is maintained in a flat state before use, and the two tubes 12 and 13 are closed by plugs (not shown). Then, blood and the like discharged from the body to the outside during surgery or the like is aspirated and discharged as follows. That is, the user removes only the plug from the suction tube 12, leaving the cap of the discharge tube 13 in place. Next, a catheter is connected to the suction tube 12, and the tip of the catheter is immersed in a pool of drained blood and the like. Furthermore, each end portion 3c, 3d of the expansion mechanism 3 is grasped from above the bag body 2 with both hands, and one end portion 3c is bent toward the bottom plate 21 side, and the other end portion 3d is bent toward the top plate 22 side. By doing so, the pair of plates 21 and 22 are unlocked, and the expansion mechanism 3 is expanded. By expanding, the bag main body 2 expands, the inside of the storage space 2a becomes negative pressure (ie, below atmospheric pressure), and blood etc. are sucked from the tip of the catheter. Then, the sucked blood and the like are guided to the storage space 2a and stored there. The drain bag 1 can suck blood and the like until the expansion mechanism 3 is fully opened, and when the expansion mechanism 3 is fully opened and the expansion mechanism 3 stops, the suction by the drain bag 1 ends once.

On the other hand, when draining the blood or the like that has been sucked into the storage space 2a, the tip of the catheter is moved away from the place where the blood or the like accumulates. Thereafter, a plug (not shown) of the discharge pipe 13 is removed, the drain bag 1 is tilted, and the liquid is discharged from the discharge pipe 13 into a waste liquid container or the like. When suction is to be performed again, the intermediate portions 31, 35 of the pair of plates 21, 22 are held between the fingers of both hands, and the intermediate portions 31, 35 are pushed toward each other against the biasing force of the coil spring 23. When the expansion mechanism 3 is pushed in until it becomes flat, the pair of plates 21, 22 are locked by the three locking mechanisms 40, 41, 41. By releasing the lock again from this state, blood etc. can be sucked into the drain bag 1 again.

In the drain bag 1 configured in this way, since a non-magnetic wire is used for the coil spring 23, it is possible to suppress the expansion mechanism 3 having the coil spring 23 from being attracted to the magnetism generating part in the MRI apparatus. . Therefore, the drain bag 1 can also be used in treatments using an MRI apparatus. In addition, since it is made of non-magnetic steel wire with a magnetic permeability of 1.01 or less when the processing rate is 60% or more, the coil spring 23 with the number of turns as shown in FIG. 6, that is, the coil spring 23 with a high processing rate, Even if there is a magnetic field, it is possible to suppress the magnetic field from being attracted to the magnetic generating part of the MRI apparatus. Thereby, the coil springs 23 with various numbers of turns can be applied to the drain bag 1, and drain bags 1 that can be used in treatments using an MRI apparatus and have various suction forces can be manufactured.

Further, the coil spring 23 is a compression coil spring having a generally truncated conical shape and whose windings are arranged so that their windings do not overlap each other in a plan view, and are accompanied by a large processing rate. However, as mentioned above, the coil spring 23 is made of non-magnetic steel wire with magnetic permeability of 1.01 or less when the processing rate is 60% or more, so it is difficult to maintain non-magnetic properties even with large processing. can. Therefore, the drain bag 1 can be used even in treatments using an MRI apparatus, and can be made thinner before use.

Furthermore, in the drain bag 1, since the pair of plates 21, 22 are locked by the three locking mechanisms 40, 41, 41, the urging force received from the coil spring 23 can be distributed to each of the locking mechanisms 40, 41, 41. I can do it. That is, the load acting on the main lock mechanism 40 can be reduced, and deformation of the area around the main lock mechanism 40, specifically around the bottom side engagement block 42, due to the load can be suppressed. Thereby, it is possible to prevent the drain bag 1 from unintentionally operating due to undesired deformation around the bottom side engagement block 42. In this way, deformation is suppressed by devising the shape, so the possibility of problems occurring during use is reduced without providing a reinforcing member such as a metal plate.

<About other embodiments>
In the drain bag 1 of this embodiment, NAS106N steel wire is used as the wire of the coil spring 23, but the wire is not necessarily limited to such a wire. For example, a non-magnetic wire material such as titanium may be used. Further, any wire material that can maintain non-magnetic properties even after processing, such as titanium, may be used. Furthermore, if a non-magnetic steel wire material having a magnetic permeability of 1.01 or less at a processing rate of 60% or more as described above is used, the manufacturing cost of the coil spring 23 can be reduced compared to the case where titanium is used.

Further, in the drain bag 1, the pair of plates 21, 21 are locked by three locking mechanisms 40, 41, 41, but three locking mechanisms are not necessarily required. The expansion mechanism 3 may have only the main lock mechanism 40, or may have only the pair of sub-lock mechanisms 41, 41, for example. In this case, the sub-lock mechanisms 41, 41 play the role of a lock section. Further, the configuration of each of the locking mechanisms 40, 41, 41 is not necessarily limited to the configuration described above, and may be any configuration that can lock the pair of plates 21, 22. Note that the through hole 31b formed in the bottom plate 21 is not necessarily necessary as long as the two engaging blocks 42 and 43 can be engaged with each other. Even in this case, ribs may be formed at positions corresponding to the bridges 44.

Further, in this embodiment, the case where the coil spring 23 is used in the drain bag 1 has been described, but the coil spring 23 may be applied to medical equipment other than the drain bag 1. The coil spring 23, which is a spring member for medical equipment, may be applied to, for example, a PCA (Patient Controlled Analgesia) device, and may be used as long as it is a medical equipment that employs a generally truncated cone-shaped compression coil spring. can. By employing the coil spring 23 in this manner, the above-mentioned medical equipment can be used even in a treatment using an MRI apparatus. Further, although the drain bag 1 of this embodiment uses the coil spring 23, it is not necessarily limited to a compression coil spring. For example, it may be a leaf spring, as long as it is made of a non-magnetic material and can apply a biasing force to the pair of plates 21 and 22 to expand the expansion mechanism 3.

Moreover, although the expansion mechanism 3 of the drain bag 1 of this embodiment has a pair of plates 21 and 22, it does not necessarily need to have a pair of plates 21 and 22. For example, it is sufficient to have a lock part that can hold the coil spring 23 in a compressed state and release it. It may be an expansion mechanism that can release the engagement by performing a release operation. The drain bag 1 of this embodiment has the same effects as the drain bag 1 of this embodiment.

1: Drain bag 2: Bag body (reservoir)
2a: Storage space 3: Expansion mechanism 21: Bottom plate 22: Top plate 23: Coil spring (spring member, spring member for medical equipment)
40 Main lock mechanism (lock part)
41 Sub-block mechanism 42 Bottom side engagement block (engagement part)
43 Top side engagement block (engagement part)
44 Bridge (rib)

Claims (5)

a reservoir having a suction port and capable of sucking extracorporeal fluid through the suction port and storing it therein by expanding;
an expansion mechanism that is housed in the reservoir and expands to inflate the reservoir and suck liquid from the suction port;
The expansion mechanism is
a pair of plates arranged on top of each other, the pair of plates being able to expand at least a portion of one plate away from the other plate;
a spring member disposed between the pair of plates and biasing at least a portion of the one plate to separate it from the other plate;
a locking mechanism that can be switched between a locked state in which the at least one portion of the plate is locked to prevent it from separating from the other plate and a released state that allows at least one portion of the one plate to be separated from the other plate. ,
The pair of plates are made of resin,
The spring member is formed into a generally truncated cone shape when viewed from one side in the axial direction so that the windings do not overlap each other, and is made of a non-magnetic steel wire or titanium winding having a magnetic permeability of 1.01 or less. A medical suction liquid collection device that is a compression coil spring. The locking mechanism is provided on each of the pair of plates, and has a pair of engaging portions that can be engaged with each other to achieve a locked state,
The medical suction liquid collection device according to claim 1 , wherein at least one of the pair of plates has a rib formed around the engaging portion provided on the plate. The medical suction liquid collection device according to claim 1 or 2 , wherein the expansion mechanism has at least two or more of the locking mechanisms. a resin reservoir having a suction port and capable of sucking extracorporeal liquid through the suction port and storing it therein by expanding;
an expansion mechanism that is housed in the reservoir and expands to inflate the reservoir and suck liquid from the suction port;
The expansion mechanism is
A compression coil spring made of non-magnetic steel wire or titanium wire , which is formed into a roughly truncated cone shape so that the windings do not overlap each other when viewed from one side in the axial direction, and has a magnetic permeability of 1.01 or less. a spring member for expanding the reservoir;
A medical suction liquid collection device having a lock portion that releasably maintains a spring member in a compressed state. A medical device spring member provided in a drain bag or a PCA device,
It is a compression coil spring made of non-magnetic steel wire or titanium wire having a magnetic permeability of 1.01 or less and formed into a roughly truncated cone shape so that the windings do not overlap each other when viewed from one side in the axial direction. , Spring members for medical devices.

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