阅读说明：本技术 流路开闭机构和具备该流路开闭机构的腹膜透析装置 (Flow path opening/closing mechanism and peritoneal dialysis apparatus provided with same ) 是由 森田祐卓 吉田英雄 于 2017-07-19 设计创作，主要内容包括：提供不易产生由管变形引起的流路闭塞的流路开闭机构和具备该流路开闭机构的腹膜透析装置。流路开闭机构1,使在具有挠性的管的内部形成的液体流路开闭,其具备：夹持部20,具有能够挤压管的挤压构件21和使挤压构件21在第一方向上进退的驱动机构22,通过使挤压构件21前进从而关闭流路,通过使挤压构件21后退从而开放流路；引导构件30,在夹持部20的附近限制管的位置,引导构件30具备：引导构件主体31；槽部32,在引导构件主体31上在第一方向上延伸,并且形成为管的外径D2以下的宽度D1,槽部在与第一方向交叉的第二方向上夹持管。(Provided are a flow path opening/closing mechanism which is less likely to cause flow path blockage due to tube deformation, and a peritoneal dialysis apparatus provided with the flow path opening/closing mechanism. A flow path opening/closing mechanism 1 for opening/closing a liquid flow path formed inside a flexible tube, comprising: a clamping section 20 having a pressing member 21 capable of pressing the tube and a driving mechanism 22 for advancing and retreating the pressing member 21 in a first direction, the pressing member 21 being advanced to close the flow path, and the pressing member 21 being retreated to open the flow path; a guide member 30 that restricts the position of the pipe in the vicinity of the clamping portion 20, the guide member 30 including: a guide member main body 31; and a groove portion 32 extending in the first direction on the guide member body 31 and formed to have a width D1 equal to or smaller than an outer diameter D2 of the tube, the groove portion sandwiching the tube in a second direction intersecting the first direction.)

1. A flow path opening/closing mechanism that opens and closes a liquid flow path formed inside a flexible tube, the flow path opening/closing mechanism comprising:

a clamping section having a pressing member capable of pressing the tube and a driving mechanism for advancing and retreating the pressing member in a first direction, the clamping section closing the flow path by advancing the pressing member and opening the flow path by retreating the pressing member; and

a guide member that restricts a position of the tube in the vicinity of the nip portion,

the guide member includes:

a guide member body; and

a groove portion extending in the first direction on the guide member body and formed to a width equal to or less than an outer diameter of the pipe, the groove portion clamping the pipe in a second direction intersecting the first direction.

2. The flow path opening/closing mechanism according to claim 1,

the width of the groove portion is smaller than the outer diameter of the tube.

3. The flow path opening/closing mechanism according to claim 1 or 2,

the guide member is disposed on one end side and the other end side in the vicinity of the clamping portion on the pipe.

4. The flow path opening/closing mechanism according to any one of claims 1 to 3,

a plurality of the clamping parts which are arranged corresponding to the plurality of the pipes,

the guide member has a plurality of the groove portions arranged corresponding to the plurality of the clamping portions.

5. A peritoneal dialysis apparatus is provided with:

the flow path opening/closing mechanism according to claim 4;

a liquid feeding/discharging cassette including a plurality of tubes each having one end connected to a dialysate supply source or a dialysate feeding destination, a chamber section connected to the other end of the tube, and a diaphragm partitioning the inside of the chamber section; and

and an air pump that draws or sends a predetermined amount of dialysate by inputting and outputting air into and from the chamber section to reciprocate the diaphragm.

Technical Field

The present invention relates to a flow path opening/closing mechanism for opening and closing a liquid flow path formed inside a flexible tube, and a peritoneal dialysis apparatus provided with the flow path opening/closing mechanism.

Background

Conventionally, a peritoneal dialysis apparatus has been proposed in which a dialysate is infused into the abdominal cavity of a patient, and the infused dialysate is discharged after a predetermined time has elapsed, thereby discharging waste substances and the like contained in blood to the outside of the body (see, for example, patent document 1). In such a peritoneal dialysis apparatus, a liquid feeding step of sucking a predetermined amount of dialysate from a dialysate bag containing the dialysate and then supplying the sucked dialysate into the abdominal cavity and a draining step of sucking a predetermined amount of dialysate (drain) from the abdominal cavity and then discharging the sucked dialysate (drain) into a drain bag are repeated.

As a configuration for performing the liquid feeding step and the liquid discharging step, the peritoneal dialysis apparatus includes: a liquid feeding/discharging cassette including a plurality of flexible tubes having one end connected to a dialysate bag or a liquid discharging bag, a chamber section connected to the other end of the plurality of tubes, and a diaphragm (diaphragm) partitioning the inside of the chamber section; a flow path opening/closing mechanism for closing the flow path by pressing the plurality of tubes of the liquid feeding/discharging cartridge and opening the flow path by releasing the pressing; and an air pump that draws or sends a fixed amount of dialysate by inputting and outputting air into and from the chamber section to reciprocate the diaphragm.

Disclosure of Invention

Problems to be solved by the invention

In the flow path opening/closing mechanism, a flexible tube is pressed in a predetermined direction to deform the tube in a squashed manner, thereby closing the flow path. Therefore, for example, when the temperature of the use environment of the peritoneal dialysis apparatus is low, it takes time until the deformed tube shape is restored when the flow path is opened from the state in which the flow path is closed, and it may be erroneously detected that the flow path is closed by the peritoneal dialysis apparatus. In addition, there are also the following problems: since the shape recovery of the tube is slow in the case of opening the flow path, the time taken for feeding/discharging the dialysate becomes long.

Accordingly, an object of the present invention is to provide a flow path opening/closing mechanism that is less likely to cause flow path blockage due to tube deformation, and a peritoneal dialysis apparatus including the flow path opening/closing mechanism.

Means for solving the problems

The present invention relates to a flow path opening/closing mechanism for opening/closing a flow path of a liquid formed inside a flexible tube, the mechanism including: a clamping section having a pressing member capable of pressing the tube and a driving mechanism for advancing and retreating the pressing member in a first direction, the clamping section closing the flow path by advancing the pressing member and opening the flow path by retreating the pressing member; and a guide member that restricts a position of the pipe in a vicinity of the clamping portion, the guide member including: a guide member body; and a groove portion extending in the first direction on the guide member main body and formed to a width of an outer diameter or less of the pipe, the groove portion clamping the pipe in a second direction intersecting the first direction.

Further, it is preferable that the groove portion has a width smaller than an outer diameter of the tube.

Further, it is preferable that the guide member is disposed on one end side and the other end side in the vicinity of the clamping portion on the pipe.

Preferably, the flow path opening/closing mechanism includes a plurality of the clamping portions arranged to correspond to the plurality of tubes, and the guide member includes a plurality of the grooves arranged to correspond to the plurality of the clamping portions.

Further, the present invention relates to a peritoneal dialysis apparatus including: the flow path opening/closing mechanism; a liquid feeding/discharging cassette including a plurality of the tubes each having one end connected to a dialysate supply source or a dialysate delivery destination, a chamber section connected to the other end of the tube, and a diaphragm partitioning the inside of the chamber section; and an air pump that draws or sends a fixed amount of dialysate by inputting and outputting air into and from the chamber section to reciprocate the diaphragm.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a flow path opening/closing mechanism that is less likely to cause flow path blockage due to tube deformation, and a peritoneal dialysis apparatus including the flow path opening/closing mechanism.

Drawings

Fig. 1 is a perspective view showing a peritoneal dialysis apparatus equipped with a flow path opening/closing mechanism according to an embodiment of the present invention.

Fig. 2 is a diagram showing the configuration of the liquid feeding/discharging cassette of the peritoneal dialysis apparatus according to the present embodiment.

Fig. 3 is an enlarged view of a flow path opening/closing mechanism portion in the peritoneal dialysis set shown in fig. 1.

Fig. 4 is a perspective view showing a state in which the liquid feeding/discharging cassette is attached to the flow path opening/closing mechanism.

Fig. 5 is a plan view showing a state where the liquid feeding/discharging cassette is attached to the flow path opening/closing mechanism.

Fig. 6 is a plan view showing the structure of the clamping section of the flow path opening/closing mechanism.

Fig. 7 is a view schematically showing the operation of the clamping portion, and corresponds to the cross section taken along line X-X in fig. 6. Fig. 7 (a) shows a state in which the flow path of the tube is closed, and fig. 7 (b) shows a state in which the flow path of the tube is open.

Fig. 8 is a view schematically showing the operation of the clamping portion, and corresponds to the Y-Y line cross section of fig. 6. Fig. 8 (a) shows a state in which the flow path of the tube is closed, and fig. 8 (b) shows a state in which the flow path of the tube is open.

Fig. 9 is a front view showing a state where the pipe is clamped in the groove portion of the guide member.

Fig. 10 is a perspective view showing a state in which the flow path of the tube is closed by the flow path opening/closing mechanism of the present embodiment.

Detailed Description

Hereinafter, a preferred embodiment of the flow path opening/closing mechanism and the peritoneal dialysis apparatus according to the present invention will be described with reference to the drawings.

As shown in fig. 1, the flow path opening/closing mechanism 1 of the present embodiment is applied to a peritoneal dialysis apparatus 100. First, the structure of the peritoneal dialysis set 100 will be described.

As shown in fig. 1 and 2, the peritoneal dialysis apparatus 100 includes: the dialysis apparatus main body 110, a heating unit 120 that houses and heats a dialysate bag, a heating unit lid section 111 that covers the heating unit 120, a liquid feeding/discharging cassette 130 (see fig. 2) that sucks and discharges a certain amount of dialysate, a flow path opening/closing mechanism 1 that opens and closes a flow path of the liquid feeding/discharging cassette 130, an air pump 140 that operates the liquid feeding/discharging cassette 130, a cassette lid section 112 that covers the flow path opening/closing mechanism 1, and an operation section 150.

The dialysis device body 110 forms the external shape of the peritoneal dialysis device 100.

The heating unit 120 is disposed on the upper surface portion of the dialysis device main body 110. The heating unit 120 includes a storage unit 121 that stores a dialysate bag containing dialysate, and a heating mechanism (not shown) that heats the heating dialysate bag. The heating unit 120 heats the heating dialysate bag (dialysate) stored in the storage unit 121 to a predetermined temperature by a heating mechanism. The temperature of the dialysate heated by the heating unit 120 is measured by a temperature sensor 123.

The heating unit cover 111 is attached to the dialysis device main body 110 so as to be openable and closable, and covers the heating unit 120.

As shown in fig. 2, the liquid feeding/discharging cassette 130 includes: a plurality of tubes 131, 132, 133, 134, 135, a chamber 136, a diaphragm 137 disposed inside the chamber 136, and a fixing member 138 for fixing the plurality of tubes 131, 132, 133, 134, 135.

The plurality of tubes 131, 132, 133, 134, 135 are made of a flexible synthetic resin (e.g., soft polyvinyl chloride). One end of each of these tubes 131, 132, 133, 134, and 135 is connected to a dialysate supply source (a heating dialysate bag 101, a replenishment dialysate bag 102, and a concentration change dialysate bag 103, which will be described later) or a dialysate delivery destination (an abdominal cavity of the patient P, a drain bag 104).

In the present embodiment, the tube 131 is connected to the heating dialysate bag 101 housed in the heating unit 120, and constitutes a part or all of the heating line L1 (the same applies hereinafter). The tube 132 is connected to the replenishment dialysate bags 102 (three replenishment dialysate bags 102 in the present embodiment), and constitutes a replenishment line L2. The tube 133 is connected to a concentration-changing dialysate bag 103 containing a dialysate having a concentration different from that of the dialysate contained in the replenishment dialysate bag 102, and constitutes a concentration-changing line L3. Tube 134 is connected to the abdominal cavity of patient P to form peritoneal line L4. The pipe 135 is connected to the drain bag 104 for storing the drain liquid, and constitutes a drain line L5.

Each tube is connected to a bag or the like directly or via a connector.

The cavity 136 is made of a hard synthetic resin (e.g., hard polyvinyl chloride) and formed to have a predetermined capacity (e.g., 100 ml). In the present embodiment, the cavity 136 is formed in a shape in which parts of two spherical surfaces having the same shape are bonded. A through hole 136a for allowing the inside and the outside of the cavity 136 to communicate with each other is formed in the center of each of the two spherical surfaces of the cavity 136. The other end sides of the plurality of tubes 131, 132, 133, 134, 135 are connected to the through hole 136a of one spherical surface. More specifically, the other end sides of the plurality of tubes 131, 132, 133, 134, 135 are collected into one tube 139, and the collected tube 139 is connected to the through hole 136a formed in one spherical surface of the cavity 136.

The diaphragm 137 is formed of a film member having elasticity, and partitions the inside of the cavity portion 136.

The fixing member 138 includes a rectangular frame-shaped portion 138a and a rod-shaped portion 138b having one end connected to the frame-shaped portion 138a and extending in a rod shape. A plurality of fixing grooves 138c (see fig. 2) for fixing the plurality of tubes 131, 132, 133, 134, 135 in a state where the plurality of tubes 131, 132, 133, 134, 135 are arranged in parallel with each other are formed in the frame-shaped portion 138a, and the tubes 131, 132, 133, 134, 135 are fixed to the fixing grooves, whereby the tubes 131, 132, 133, 134, 135 are fixed to the frame-shaped portion 138 a. The other end side of the rod-shaped portion 138b is connected to the cavity portion 136, and supports one tube 139 that is collected on the other end sides of the tubes 131, 132, 133, 134, 135.

As shown in fig. 1 and 3, the flow path opening/closing mechanism 1 is disposed on the upper surface of the dialysis device main body 110. As shown in fig. 3 to 5, the liquid feeding/discharging cassette 130 is attached to the flow path opening/closing mechanism 1. The flow path opening/closing mechanism 1 opens and closes the flow paths of the plurality of tubes 131, 132, 133, 134, 135 of the liquid feeding/discharging cartridge 130.

The flow path opening/closing mechanism 1 includes a clamping portion 20 and a guide member 30.

As shown in fig. 6 and 7, the clamping portion 20 includes: a pressing member 21 for pressing the tube, a driving mechanism 22 for advancing and retreating the pressing member 21, and a pressing member 23 disposed on the opposite side of the pressing member 21 with the tube therebetween.

In the present embodiment, 5 sets of the clip portions 20 are arranged corresponding to 5 tubes 131, 132, 133, 134, and 135, respectively. More specifically, as shown in fig. 3 to 6, in the present embodiment, the clamping portions 20 are arranged in two rows, the clamping portions 20 of the open/close tubes 131, 135 are arranged in one row (the right row in fig. 5), and the clamping portions 20 of the open/close tubes 132, 133, 134 are arranged in the other row (the left row in fig. 5).

As shown in fig. 3, the distal end portion (upper end portion) of the pressing member 21 has a width slightly wider than the width (outer diameter) of the tube, and is formed in a tapered (thin thickness) shape. The pressing member 21 is disposed below the pipe so that the width direction of the distal end portion is along the width direction of the pipe.

As shown in fig. 6 and 7, the drive mechanism 22 includes a cam 221, a shaft member 222 coupled to the cam 221 and serving as a rotation shaft, and a motor 223 that rotates the shaft member 222. In the present embodiment, the drive mechanism 22 includes two shaft members 222 and a motor 223 corresponding to the clamping portions 20 arranged in two rows. Further, a cam 221 for moving the pressing members 21 corresponding to the tubes 131, 135 in the vertical direction (first direction) is attached to the shaft member 222 of one row (the right row in fig. 6), and a cam 221 for moving the pressing members 21 corresponding to the tubes 132, 133, 134 in the vertical direction is attached to the shaft member 222 of the other row (the left row in fig. 6). The plurality of cams 221 attached to the single shaft member 222 are arranged so that the positions of the long diameter portions are offset from each other.

According to the above drive mechanism 22, the shaft member 222 is rotated by the drive motor 223, and the cam 221 is rotated. Then, as shown in fig. 7 (a) and 8 (a), the pressing member 21 is moved upward by pushing the pressing member 21 by the long diameter portion of the cam 221, and as shown in fig. 7 (b) and 8 (b), the pressing member 21 is moved downward by releasing the force of pushing the pressing member 21 by the short diameter portion of the cam 221.

As shown in fig. 7 and 8, the pressing member 23 is disposed above the tube so as to face the pressing member 21. In the present embodiment, as shown in fig. 1, the pressing member 23 is attached to an inner surface of a lid unit 112 described later.

As shown in fig. 4 and 5, the guide member 30 is disposed in the vicinity of the grip portion 20 and regulates the position of the tube. More specifically, the guide members 30 are disposed on both sides of the clamping portion 20 (pressing member 21) of each of the plurality of tubes 131, 132, 133, 134, 135 of the liquid feeding/discharging cartridge 130 attached to the flow path opening/closing mechanism 1. In the present embodiment, since the clamping portions 20 are arranged in two rows, the guide members 30 are arranged in 4 rows.

As shown in fig. 3 to 5, the guide member 30 includes a guide member body 31 having a rectangular plate shape and a groove portion 32 formed in the guide member body 31.

The guide member body 31 is configured to: the longitudinal direction is along a direction intersecting (orthogonal to) the direction in which the tube extends. The guide member 30 is disposed so that the plate surface thereof is along the vertical direction.

The groove 32 is formed in the guide member body 31 so as to extend in the vertical direction (first direction) from a side edge located on the upper side. As shown in fig. 9, the width D1 of the groove portion 32 is set to have a width equal to or less than the outer diameter D2 of the tube in a state (natural state) in which no tension or the like is applied. The pipe is pushed into the groove portion 32, and is held by the groove portion 32 in a horizontal direction (second direction) intersecting (orthogonal to) the vertical direction (first direction), and the position is regulated. Here, for example, in the case where the width of the groove portion 32 is different from the lower side to the upper side (diameter expansion), the width D1 of the groove portion 32 indicates the width of the central portion of the groove portion 32 at the portion where the pipe is sandwiched.

In the present embodiment, the width D1 of the groove portion 32 is formed to be smaller than the outer diameter D2 of the tube. Specifically, when the outer diameter D2 of the tube is 5mm, the width D1 of the portion of the groove 32 that sandwiches the tube is preferably 3.5mm to 5mm, and more preferably 4mm to 4.5 mm.

In the present embodiment, 5 groove portions 32 are formed in one guide member 30 so as to correspond to 5 tubes 131, 132, 133, 134, 135. That is, one tube is position-restricted by the four guide members 30 (groove portions 32). Further, two of the guide members 30 (groove portions 32) grip the pipe in the vicinity of the gripping portion 20 (pressing member 21).

The position where the guide member 30 is disposed is influenced by the diameter of the tube, and in the case of the above example (the outer diameter D2 of the tube is 5mm), the position where the guide member 30 is disposed is preferably within a range of 3.0mm to 11.0mm from the clamping portion 20, and more preferably within a range of 5.0mm to 9.0mm from the clamping portion 20. By setting the distance between the position where the guide member 30 is disposed and the clamping portion 20 within the above range, the shape of the pipe can be appropriately restored by the guide member 30 (groove portion 32) as described later.

The above flow path opening/closing mechanism 1 operates as follows.

First, the liquid feeding/discharging cassette 130 is disposed in the flow path opening/closing mechanism 1. Here, as shown in fig. 4 and 5, 5 tubes 131, 132, 133, 134, 135 are each restricted in position by the groove portion 32 of the guide member 30 in the vicinity of the grip portion 20 (on both sides of the grip portion 20). Further, as shown in fig. 9, the width D1 of the portion of the groove portion 32 that sandwiches the tube is formed smaller than the outer diameter D2 of the tube. As a result, as shown in fig. 10, in the groove portion 32, a force (tension) is applied to the pipe on the closed side (arrow direction in fig. 10) in the horizontal direction (second direction).

In this state, the drive mechanism 22 is operated. That is, the motor 223 is driven to rotate the shaft member 222, thereby rotating the cam 221. Then, as shown in fig. 7 a and 8a, the pressing member 21 is moved upward by pushing the pressing member 21 upward by the long diameter portion of the cam 221, thereby pressing the pipe in the vertical direction (first direction). Thereby, the flow path of the tube is closed (see fig. 10). As shown in fig. 7 (b) and 8 (b), when the cam 221 is further rotated and the short diameter portion of the cam 221 reaches a position corresponding to the pressing member 21, the force pushing up the pressing member 21 is released, and the pressing member 21 moves downward. This releases the pressing of the tube and opens the flow path.

Here, in the present embodiment, by arranging the guide member 30 in the vicinity of the clamping portion 20 and configuring the width D1 of the groove portion 32 to be equal to or less than the outer diameter D2 of the pipe, it is possible to restrict the pipe from spreading in the horizontal direction (second direction) intersecting the vertical direction (first direction) pressed by the clamping portion 20 in the groove portion 32 when the pipe is pressed by the clamping portion 20 (see fig. 10). Thus, when the pipe is released from being pressed by the clamp portion 20, the restoring force of the portion pressed in the vertical direction can be assisted by the tensile force (force applied to the side closed in the horizontal direction) generated in the pipe by restricting the horizontal expansion in the groove portion 32. Therefore, the shape of the tube is quickly restored when the pressing is released, and therefore, the flow path can be hardly closed by the deformation of the tube. Further, by clamping the tube by the groove portion 32 in the vicinity of the clamping portion 20, the flow path can be pressed with high accuracy when the flow path is closed by the clamping portion 20.

In the present embodiment, the cam 221 disposed corresponding to the plurality of tubes 131, 132, 133, 134, and 135 is attached to the shaft member 222 with the position of the long diameter portion thereof shifted. Accordingly, by appropriately setting the arrangement of the long diameter portion of the cam 221, the flow path of only one of the plurality of tubes 131, 132, 133, 134, and 135 can be opened, and the flow paths of the other tubes can be closed.

As shown in fig. 1, the air pump 140 is disposed inside the dialysis apparatus main body 110, and reciprocates the diaphragm 137 by inputting and outputting air into and from the chamber section 136. More specifically, the air pump 140 is connected to a through hole in the chamber section 136 on the side not connected to the tube 139 via a tube (not shown). Then, the air inside the chamber section 136 is sucked by the air pump 140, whereby the diaphragm 137 is pulled toward the air pump 140 and the dialysate is sucked from a certain tube into the chamber section 136. In this state, air is introduced into the chamber section 136, whereby the diaphragm 137 is pushed toward the tube 139, and the dialysate sucked into the chamber section 136 is sent out. This draws or sends a predetermined amount of dialysate (the volume of the chamber 136).

The cap unit 112 is attached to the dialysis device main body 110 so as to be openable and closable, and covers the flow path opening/closing mechanism 1. As described above, the pressing member 23 for pressing the tube in the flow path opening/closing mechanism 1 is attached to the inner surface of the cover part 112.

The operation unit 150 includes a liquid crystal panel and various operation buttons. Various information such as the flow rate of the dialysate is displayed on the liquid crystal panel.

Next, an example of the operation of the peritoneal dialysis set 100 described above will be described.

In the case of using the peritoneal dialysis set 100, first, as shown in fig. 4, the liquid feeding/discharging cassette 130 is attached to the channel opening/closing mechanism 1. Subsequently, the plurality of tubes 131, 132, 133, and 135 of the liquid feeding/discharging cassette 130 are connected to the heating dialysate bag 101, the replenishment dialysate bag 102, the concentration changing dialysate bag 103, and the liquid discharging bag 104, respectively, and are subjected to priming (see fig. 2). Thereafter, the tube 134 is connected to the abdomen of the patient P, and dialysis is started.

Here, in the case of performing dialysis, air in the chamber section 136 is sucked by the air pump 140 in a state where the flow path of a predetermined one tube (for example, the tube 131) is opened by the flow path opening/closing mechanism 1 and the flow path of the other tube is closed, whereby dialysate (in this case, dialysate contained in the heating dialysate bag 101) is sucked into the chamber section 136 from the tube whose flow path is opened. Next, by operating the channel opening/closing mechanism 1 to change the tube that opens the channel (for example, the channel of the open tube 134 is closed, and the channel of the other tube is closed), air is introduced into the chamber section 136 in this state, and the dialysate sucked into the chamber section 136 is sent out (in this case, the dialysate is sent out into the abdominal cavity of the patient P). This draws and sends a predetermined amount of dialysate (the volume of the chamber section 136).

As described above, by repeating the above operation while changing the tube for opening the flow path by the flow path opening/closing mechanism 1, the supply of the dialysate into the abdominal cavity of the patient P (liquid supply step), the collection of the dialysate (drain liquid) from the abdominal cavity of the patient P, the discharge of the collected dialysate (drain liquid) into the drain bag 104 (drain step), the replenishment of the dialysate from the replenishment dialysate bag 102 into the heating dialysate bag 101, and the replenishment of the dialysate from the concentration changing dialysate bag 103 into the heating dialysate bag 101 are performed.

The flow path opening/closing mechanism 1 and the peritoneal dialysis apparatus 100 according to the present embodiment described above have the following operational advantages.

(1) The flow path opening/closing mechanism 1 includes a clamp section 20 for opening/closing the flow path of the tube by moving a pressing member 21 forward and backward in the vertical direction, and a guide member 30 disposed in the vicinity of the clamp section 20 for regulating the position of the tube, and the guide member 30 includes a groove section 32, and the groove section 32 extends in the vertical direction and has a width D1 equal to or less than the outer diameter D2 of the tube. Thus, by arranging the guide member 30 in the vicinity of the clamp section 20 and configuring the width D1 of the groove section 32 extending in the vertical direction to be equal to or less than the outer diameter D2 of the pipe, it is possible to restrict the pipe from spreading in the horizontal direction intersecting the direction (vertical direction) pressed by the clamp section 20 in the groove section 32 when the pipe is pressed by the clamp section 20. Thus, when the pipe is released from being pressed by the clamp portion 20, the restoring force of the portion pressed in the vertical direction can be assisted by the tensile force (force applied to the closed side in the horizontal direction) generated in the pipe by restricting the horizontal expansion in the groove portion 32. Therefore, the shape of the tube is quickly restored when the pressing is released, and therefore, the flow path can be hardly closed by the deformation of the tube. Further, since the tube is held by the groove portion 32 in the vicinity of the holding portion 20, the flow path can be pressed with high accuracy when the flow path is closed by the holding portion 20, and therefore, the liquid can be prevented from leaking out in a state where the flow path is closed. That is, by disposing the groove portion 32 in the vicinity of the clamping portion 20 and clamping the tube by the groove portion 32, it is possible to prevent the position of the tube from being displaced (the tube escapes from the pressing member 21) at the pressed portion when the tube is pressed by the clamping portion 20 (the pressing member 21), and therefore it is possible to appropriately close the flow path by the pressing member 21.

(2) The width D1 of the groove 32 is smaller than the outer diameter D2 of the tube. Thereby, a greater tension is generated in the horizontal direction in the groove portion 32 with respect to the tube. Therefore, the restoring force of the pipe in the case where the pressing (of the pressing member 21) is opened is further improved.

(3) The guide members 30 are disposed on both sides (one end side and the other end side) of the clamping portion 20 on the pipe. This can restrict the horizontal expansion of the pipe on both sides of the portion of the pipe pressed by the clamp portion 20, and therefore, the restoring force of the pipe when the pressing is released can be further improved.

(4) The flow path opening/closing mechanism 1 includes a plurality of clamping portions 20, and includes a plurality of grooves 32 arranged corresponding to the plurality of clamping portions 20 to form the guide member 30. This allows the flow paths of the liquid flowing through the plurality of tubes 131, 132, 133, 134, and 135 to be appropriately opened and closed.

(5) The peritoneal dialysis apparatus 100 is configured to include the flow path opening/closing mechanism 1 of the present embodiment. Thus, even when the temperature of the environment in which the peritoneal dialysis device 100 is used is low, the flow path can be made less likely to be blocked by tube deformation when the flow path is opened from the state in which the flow path is closed. Therefore, the peritoneal dialysis apparatus 100 can be realized that can perform liquid feeding and draining more appropriately.

While the preferred embodiments of the flow channel opening/closing mechanism 1 and the peritoneal dialysis apparatus 100 according to the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate.

For example, in the present embodiment, the flow path opening/closing mechanism 1 is configured to include 5 pinching portions 20 that open and close 5 flow paths, but is not limited to this. That is, the flow path opening/closing mechanism may be configured to include 4 or less clamping portions 20, and may be configured to include 6 or more clamping portions.

In the present embodiment, the liquid feeding/discharging cassette 130 is configured to include the chamber section 136 and the diaphragm 137, and a fixed amount of liquid is sucked/fed. That is, the liquid feeding/discharging cassette may be configured to include a cylinder and a piston.

In the present embodiment, the flow path opening/closing mechanism 1 is applied to the peritoneal dialysis apparatus 100, but is not limited thereto. That is, the flow path opening/closing mechanism may be applied to a device in which a liquid different from the dialysate is circulated by a tube.

Description of reference numerals

1 flow path opening/closing mechanism

20 clamping part

21 extrusion component

22 drive mechanism

30 guide member

32 groove part

130 liquid feeding/discharging box

131 tube

132 pipe

133 pipe

134 tube

135 pipe

136 cavity part

137 diaphragm

140 air pump