Valve device and liquid delivery system

Abstract

To provide a valve device and an infusion system using the same that are capable of automatically stopping the supply of infusion when required to stop the supply of infusion.SOLUTION: A valve device 100 comprises: a valve unit 2 of a flow path 90; a closing unit 1 configured to close the flow path 90 by closing the valve unit 2; and a holding unit 3 configured to open the valve unit 2 and thereby open the flow path. The holding unit 3 includes: a seat unit 30 on which the closing unit 1 is mounted; and an engaging unit 31 configured to hold the valve unit 2 in an open state when the closing unit 1 is mounted on the seat unit 30.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a valve device and a liquid delivery system.

Background Art

[0002] A catheter connected to a blood vessel or a subcutaneous implanted central venous port (CV port) is connected to a flow path (for example, a tube for infusion) that supplies infusion to the blood vessel through these catheters and ports. A valve device called a clamp for a medical tube is attached to the flow path. This valve device is used to switch between the supply and stop of infusion.

[0003] Patent Document 1 discloses a clamp for a medical tube that can improve the ease of movement of a regulating member. This clamp for a medical tube includes a clamp body and a regulating ring that is a regulating member. The clamp body has a pair of plate-like portions, a connecting portion, and a pair of clamping portions. The connecting portion connects the pair of plate-like portions so that they can approach and separate. The pair of clamping portions project so as to narrow the space between the pair of plate-like portions, and when the pair of plate-like portions are brought close to each other, they clamp the medical tube. The regulating ring moves from a regulating position to a regulating release position through the space between the pair of clamping portions, and is inserted between the pair of clamping portions from one end side portion. The one end side portion is formed to taper.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The valve device as described above is for switching the supply and stop of the infusion by an artificial operation by the user on the medical practice side. Therefore, when it becomes necessary to stop the supply of the infusion regardless of the intention of the user on the medical practice side, with the valve device as described above, the supply of the infusion cannot be stopped unless the user operates it.

[0006] For example, in the case of a patient immediately after surgery who is still under the influence of anesthesia and in a delirious state, or a dementia patient, who may remove a catheter or an infusion tube (hereinafter referred to as a drip route, etc.) fixed to their own body or bed, etc. without understanding that they should not remove it (so-called self-removal). Also, in some cases, the drip route, etc. fixed to the patient's body or bed by daily movements such as the patient turning over may accidentally come off the patient's body or bed. In such cases, there is a risk of blood loss occurring to the patient, or the infusion leaking from the tube, resulting in a risk that the administration of a desired amount of medicine, etc. cannot be carried out.

[0007] Therefore, including the case of self-removal, when the drip route, etc. fixed to the patient's body or bed comes off the patient's body or bed against the intention of the user on the medical practice side (hereinafter referred to as disconnection of fixation), it is necessary to close the valve device to close the flow path of the drip route, etc. and perform recovery measures such as reconnection and re-fixation of the drip route, etc. However, the user on the medical practice side cannot close the valve device until they notice that the disconnection of fixation has occurred. Therefore, when the disconnection of fixation of the infusion route occurs regardless of the intention of the user on the medical practice side, it is desired to provide a valve device that automatically stops the supply of the infusion.

[0008] The present disclosure has been made in view of such a situation, and its object is to provide a valve device and a liquid feeding system that automatically stop the supply of the infusion when the disconnection of fixation of the infusion route occurs regardless of the intention of the user on the medical practice side.

Means for Solving the Problem

[0009] The valve device and the liquid delivery system according to the present disclosure for achieving the above object are as follows.

[0010] [1] A valve portion of a flow path, A closing portion that closes the valve portion to close the flow path, A holding portion that opens the valve portion to open the flow path, and the holding portion includes: The holding portion includes: A seat portion on which the closing portion is mounted, An engaging portion that holds the valve portion in an open state with the closing portion mounted on the seat portion. A valve device having the engaging portion.

[0011] [2] The valve portion has an elastic portion that biases the valve portion in a closing direction, The holding portion resists the biasing force of the elastic portion to open the valve portion. The valve device according to [1] above.

[0012] [3] The valve portion has an engaged portion that engages with the engaging portion in a state where the valve portion is mounted on the seat portion, The engaged portion engages with the engaging portion to open the valve portion. The valve device according to [1] or [2] above.

[0013] [4] The seat portion is formed in a plate shape, the engaging portion is a convex portion extending from the plate surface of the seat portion, The engaged portion is a hole portion into which the convex portion fits. The valve device according to [3] above.

[0014] [5] The valve device according to any one of [1] to [4] above, further including a fixing portion for fixing the holding portion to a fixing target.

[0015] [6] The valve device according to [1] to [5] above, further including a notification portion that notifies when the opening / closing state of the valve portion changes.

[0016] [7] The valve device according to [1] to [6] above, further including a communication portion that sends a signal notifying the change when the opening / closing state of the valve portion changes.

[0017] [8] The valve portion has a clamping portion that clamps a tube having the flow path to close the flow path. The holding portion is the valve device according to any one of [1] to [7] above that opens the clamping portion and releases and opens the tube.

[0018] [9] The valve device according to any one of [1] to [7] above, and a liquid flow monitoring device that monitors the flow state of the liquid flowing through the flow path. The liquid flow monitoring device is a liquid delivery system that notifies the stop of liquid flow when the flow of the liquid stops.

[0019]

[10] The valve device according to [8] above, a tube having the flow path, which is attached to the valve device, and a liquid flow monitoring device that monitors the flow state of the liquid flowing through the tube. The liquid flow monitoring device is a liquid delivery system that notifies the stop of liquid flow when the flow of the liquid stops.

Advantages of the Invention

[0020] According to the present disclosure, there is provided a valve device and a liquid delivery system that automatically stop the supply of infusion when the fixation of the infusion route is released regardless of the intention of the user on the medical practice side.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Mode for Carrying Out the Invention

[0022] Based on the drawings, the valve device and the liquid feeding system according to the embodiments of the present disclosure will be described.

[0023] (First Embodiment) FIG. 1 shows a valve device 100 according to the present embodiment.

[0024] The valve device 100 includes a valve part 2 in a flow path 90, a closing part 1 that closes the valve part 2 to close the flow path 90, and a holding part 3 that opens the valve part 2 to open the flow path 90. The holding part 3 has a seat part 30 on which the closing part 1 is mounted, and an engaging part 31 that holds the valve part 2 in an open state with the closing part 1 mounted on the seat part 30.

[0025] The valve device 100 can automatically stop the supply of the infusion fluid when the fixation of the infusion route is released regardless of the intention of the user on the medical operation side. Specifically, when the closing part 1 is attached to the seating part 30, the valve device 100 is in an open valve state in which the engaging part 31 holds the valve part 2 in an open state. However, when the closing part 1 is detached from the seating part 30, the open valve state of the valve part 2 by the engaging part 31 is released, whereby the valve part 2 automatically closes, and the valve device 100 switches to a closed valve state in which the flow path 90 is closed.

[0026] Hereinafter, the valve device 100 will be described in detail.

[0027] As shown in FIG. 1, the valve device 100 may include a closing part 1 having a valve part 2 that opens and closes the flow path 90 by opening and closing the valve, a holding part 3 having a seating part 30 and an engaging part 31, and a fixing part 4 for fixing the holding part 3 to an object to be fixed. In FIG. 1, a case where the valve device 100 further includes an inlet side tube 91 and an outlet side tube 92 is illustrated. The space in the inlet side tube 91, the space in the valve part 2, and the space in the outlet side tube 92 communicate with each other to form the flow path 90. Note that FIG. 1 is a top view of the valve device 100. In the following description, the upper part in the valve device 100 refers to the side of the closing part 1 as viewed from the holding part 3.

[0028] Hereinafter, the direction along the flow direction of the infusion fluid will be referred to as the front-rear direction, and the direction orthogonal to the front-rear direction will be referred to as the width direction. In FIGS. 1 and below, the front-rear direction is shown as the direction L, and the width direction is shown as the direction W.

[0029] As shown in FIGS. 1 and 2, the holding part 3 is a support member that is fixed to the object to be fixed and supports the closing part 1. Further, the holding part 3 is a member for opening the valve part 2 and maintaining it in an open state. FIGS. 1 and 2 illustrate the valve device 100 in a state where its holding part 3 is fixed to the body surface H of a patient, which is the object to be fixed. Further, FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. 1. Below FIG. 2, the thickness direction of the valve device 100 is shown as the direction V. The holding part 3 has a plate-shaped seat part 30 and an engaging part 31 formed as a convex part extending from the plate surface of the seat part 30. The holding part 3 may be made of resin such as polypropylene, ABS resin, polycarbonate, or acrylic resin.

[0030] The seat part 30 may be, for example, a plate-shaped member having a rectangular shape in a top view.

[0031] The engaging part 31 may be arranged at one end side and the other end side in the width direction of the seat part 30, and may be a convex part extending from one plate surface of the seat part 30. In the present embodiment, a case where the engaging part 31 is a straight cylindrical rod-shaped part 31a arranged at one end side in the width direction of the seat part 30 and a rod-shaped part 31a arranged at the other end side is illustrated. The rod-shaped parts 31a, 31a may stand perpendicularly from the plate surface of the seat part 30 to the plate surface.

[0032] As shown in FIGS. 1 to 4, the closing part 1 has a main body part 10, a through-hole 11 for a flow path as the flow path 90 formed in the main body part 10, a valve part 2 for closing the through-hole 11 for a flow path, and a hole part 13 formed so that at least one end side is open along the thickness direction. FIGS. 3 and 4 show a state where the closing part 1 is removed from the holding part 3 (see FIGS. 1 and 2). FIG. 3 is a top view of the closing part 1. FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG. 3.

[0033] The main body part 10 may be formed, for example, in a rectangular parallelepiped shape. The main body part 10 is preferably formed of an elastic material having elasticity, such as rubber or rubber-like material such as silicone rubber, polybutadiene rubber, or soft vinyl chloride.

[0034] The through-hole 11 for the flow path may be formed to penetrate the main body portion 10 along the front-rear direction. The through-hole 11 for the flow path is in a cut state cut along the front-rear direction in a state where it is removed from the holding portion 3 (see FIGS. 1 and 2), that is, in a state where no external force is applied to the main body portion 10 as described later, and the flow path 90 may be in a closed state (see FIGS. 3 and 4).

[0035] In the closing portion 1, when the main body portion 10 is deformed so as to open the cut as the through-hole 11 for the flow path in the width direction, the through-hole 11 for the flow path becomes a through-hole, and the flow path 90 is opened. That is, the entire elastic member (that is, the main body portion 10) around the through-hole 11 for the flow path is the valve portion 2, and the main body portion 10 biases the valve portion 2 in the closing direction as an elastic portion. As described later, if the holding portion 3 expands and opens the valve portion 2 in the width direction against the biasing force of the main body portion 10, the through-hole 11 for the flow path opens as the flow path 90.

[0036] As shown in FIGS. 1 and 2, when the main body portion 10 is mounted on the seat portion 30, the through-hole 11 for the flow path is arranged along the plate surface of the seat portion 30. The hole portion 13 may be a recess in which at least the side facing the seat portion 30 is open and the engaging portion 31 can be fitted. In FIG. 1, an example in which the hole portion 13 is formed as a through-hole as an example of such a recess is illustrated.

[0037] The main body portion 10 (valve portion 2) has, as the hole portion 13, a through-hole 13a arranged on one end side of the main body portion 10 with the through-hole 11 for the flow path interposed therebetween and a through-hole 13a arranged on the other end side. As described later, when the main body portion 10 is mounted on the seat portion 30, the rod-shaped portions 31a, 31a as the engaging portions 31 are fitted into the through-holes 13a, 13a for mounting. That is, the through-holes 13a, 13a are engaged portions that engage with the engaging portion 31 in a state where the main body portion 10 is mounted on the seat portion 30. The rod-shaped portion 31a may penetrate the through-hole 13a as shown in FIG. 2, but it is not essential to penetrate.

[0038] As shown in FIG. 1, the inlet-side tube 91 and the outlet-side tube 92 may be connected to the main body 10 so as to communicate with the through-hole 11 for the flow path, respectively. Tubes for infusion may be connected to the inlet-side tube 91 and the outlet-side tube 92.

[0039] As shown in FIGS. 1 and 2, the fixing part 4 is a fixture or a fixing material for fixing the holding part 3 to the object to be fixed. The fixing part 4 may fix the seat part 30 to the object to be fixed. The object to be fixed may be the skin of a patient, clothes, the bed on which the patient is lying, or an infusion stand for hanging an infusion bag, etc., and may be arbitrarily selected according to the application.

[0040] When the object to be fixed is the skin of a patient (when the holding part 3 is fixed to the skin of the patient), the fixing part 4 may be a double-sided tape attached to the plate surface of the seat part 30 on the side facing the skin (the side opposite to the side where the engaging part 31 is arranged), or an adhesive tape arranged so as to cover the plate surface of the seat part 30 on the side where the engaging part 31 is arranged and having the adhesive surface facing the skin side.

[0041] When the object to be fixed is clothes, the fixing part 4 may be a hook-and-loop fastener, a snap button, etc. When the object to be fixed is a bed or an infusion stand, the fixing part 4 may be something like a hole or a hook formed in the seat part 30 for hooking a hanging fitting locked to the bed or the infusion stand.

[0042] In the present embodiment, the case where the fixing part 4 is an adhesive tape arranged so as to cover the plate surface of the seat part 30 on the side where the engaging part 31 is arranged and having the adhesive surface facing the skin side is exemplified and described. In FIG. 2, the fixing part 4 is an adhesive tape having an adhesive layer on the side facing the skin of the patient, covering the plate surface of the seat part 30 in a top view, and sticking the part protruding from the seat part 30 to the skin (body surface H) of the patient to fix the holding part 3 to the skin of the patient.

[0043] The usage method of the valve device 100 will be described below. As described above, in the valve device 100, the holding portion 3 resists the biasing force of the main body portion 10 and expands the valve portion 2 in the width direction, so that the through hole 11 for the flow path opens as the flow path. In the valve device 100, when the closing portion 1 is attached to the holding portion 3, the holding portion 3 expands the valve portion 2 in the width direction, and the through hole 11 for the flow path opens as the flow path.

[0044] The valve device 100 may be attached to the patient's skin, for example, by the following procedure. As shown in FIGS. 1 and 2, first, the seat portion 30 is fixed to the patient's skin with the fixing portion 4. Next, the closing portion 1 is attached to the holding portion 3. To attach the closing portion 1 to the holding portion 3, the user expands the main body portion 10 in the width direction and biases the main body portion 10 toward the seat portion 30 while fitting the rod-shaped portions 31a, 31a of the holding portion 3 into the through holes 13a, 13a.

[0045] When the rod-shaped portions 31a, 31a are fitted into the through holes 13a, 13a, the rod-shaped portions 31a, 31a expand the valve portion 2 in the width direction against the biasing force of the main body portion 10 through the through holes 13a, 13a, and the flow path 90 opens (the valve portion 2 opens). As a result, the through hole 11 for the flow path is in an open state, and the flow path 90 is opened. In this way, the holding portion 3 opens the valve portion 2 against the biasing force of the main body portion 10 as the elastic portion.

[0046] In a state where the rod-shaped portions 31a, 31a are fitted into the through holes 13a, 13a, the rod-shaped portions 31a, 31a maintain the state of expanding the valve portion 2 in the width direction against the biasing force of the main body portion 10 through the through holes 13a, 13a, that is, the open state of the valve device 100 (valve portion 2) is maintained. As a result, the through hole 11 for the flow path as the flow path 90 is maintained in an open state.

[0047] When a force in a direction away from the holding portion 3 is applied to the closing portion 1 by the patient pulling the infusion tube or the like, the rod-shaped portions 31a, 31a come out of the through holes 13a, 13a, and the closing portion 1 detaches from the holding portion 3 (the fixation of the infusion route is released). When the rod-shaped portions 31a, 31a come out of the through holes 13a, 13a, the main body portion 10 contracts in the width direction by its own elasticity, the through hole 11 for the flow path closes, and the valve portion 2 returns to the closed valve state (see FIGS. 3 and 4). That is, the flow path 90 is closed. In the valve device 100, in this way, regardless of the intention of the user on the medical practice side, for example, when the fixation of the infusion route is released by the patient pulling the infusion tube or the like, the valve portion 2 automatically switches to the closed valve state and stops the supply of the infusion.

[0048] Note that if the diameter of the rod-shaped portion 31a is smaller than the inner diameter of the through hole 13a, the rod-shaped portion 31a is more likely to come out of the through hole 13a. When the diameter of the rod-shaped portion 31a approaches the inner diameter of the through hole 13a, the rod-shaped portion 31a is less likely to come out of the through hole 13a. When the entire main body portion 10 is formed of an elastic material, the diameter of the rod-shaped portion 31a may be slightly larger than the inner diameter of the through hole 13a. In this case, the rod-shaped portion 31a is even less likely to come out of the through hole 13a. The ease of detachment when the closing portion 1 detaches from the holding portion 3, that is, the ease of the rod-shaped portion 31a coming out of the through hole 13a, may be adjusted by the balance between the diameter of the rod-shaped portion 31a and the inner diameter of the through hole 13a.

[0049] As described above, the rod-shaped portion 31a may penetrate the through hole 13a, but penetration is not essential. The shorter the axial length of the rod-shaped portion 31a is with respect to the axial length of the through hole 13a, the easier it is for the rod-shaped portion 31a to come out of the through hole 13a. The longer the axial length of the rod-shaped portion 31a is with respect to the axial length of the through hole 13a, the more difficult it is for the rod-shaped portion 31a to come out of the through hole 13a. The ease of detachment when the closing portion 1 detaches from the holding portion 3, that is, the ease of the rod-shaped portion 31a coming out of the through hole 13a, may be adjusted by the balance between the axial length of the rod-shaped portion 31a and the axial length of the through hole 13a.

[0050] When the closing part 1 detaches from the holding part 3, the ease of detachment can be adjusted by the combination of the balance between the diameter of the rod-shaped part 31a and the inner diameter of the through-hole 13a and the balance between the axial length of the rod-shaped part 31a and the axial length of the through-hole 13a. For example, by setting the diameter of the rod-shaped part 31a and the inner diameter of the through-hole 13a to be about the same (as an example, the diameter of the rod-shaped part 31a is 95% or more and 105% or less of the inner diameter of the through-hole 13a) and setting the axial length of the rod-shaped part 31a to be 50% or less of the axial length of the through-hole 13a, it is possible to avoid the closing part 1 accidentally detaching from the holding part 3 during normal times, and when the patient attempts self-removal, the closing part 1 can be easily detached from the holding part 3. Note that it is preferable that the axial length of the rod-shaped part 31a is 25% or more of the axial length of the through-hole 13a. Thereby, it is possible to appropriately avoid the closing part 1 accidentally detaching from the holding part 3 during normal times.

[0051] Now, as shown in FIG. 5, the valve device 100 can also be used together with a liquid flow monitoring device 71 that monitors the flow state of the liquid flowing through the flow path 90. FIG. 5 shows a liquid delivery system 200 including the valve device 100 and the liquid flow monitoring device 71. In the liquid delivery system 200, the infusion filled in the infusion bag 79 is supplied to the patient via the drip chamber 78. The drip chamber 78 and the valve device 100 are connected via an infusion tube 95 or the like that constitutes a part of the flow path 90.

[0052] The liquid flow monitoring device 71 may be any device that can monitor whether the infusion is flowing through the infusion tube 95 and can notify the stop of liquid flow when the flow of the infusion stops. An example of the liquid flow monitoring device 71 is a pump or a flow controller for infusion that has a function of monitoring whether the infusion is flowing and notifying the stop of liquid flow when the flow of the infusion stops.

[0053] If the liquid supply system 200 is provided with such a liquid flow monitoring device 71 and the valve device 100, when the valve device 100 switches from the open valve state to the closed valve state, the liquid supply system 200 can notify the liquid flow monitoring device 71 of the stop of liquid flow. Specifically, when the valve device 100 switches from the open valve state to the closed valve state, the liquid flowing through the flow path 90 stops flowing, and the liquid flow monitoring device 71 detects this stop of liquid flow and notifies it.

[0054] As a notification of the stop of liquid flow, the liquid flow monitoring device 71 may emit a sound such as a warning sound from a speaker or emit light by lighting a warning lamp. Further, as a notification of the stop of liquid flow, the liquid flow monitoring device 71 may send out an electrical signal including information indicating that the stop of liquid flow has occurred. The electrical signal may be sent toward a receiver via an electric wire or may be sent as a radio wave signal. The electronic device that has received the electrical signal may notify a warning sound or may display a warning on the screen of the electronic device.

[0055] (Second Embodiment) In the first embodiment described above, in the valve device 100 shown in FIGS. 1 and 2, the entire elastic member (that is, the main body portion 10) around the through hole 11 for the flow path is the valve portion 2, and the case where the main body portion 10 biases the valve portion 2 in the closing direction as an elastic portion has been described (see FIG. 3 and the like). In the second embodiment, as shown in FIGS. 6 to 8, the closing portion 1 of the valve device 100 has an accommodation space 15 in the main body portion 10 for accommodating the valve portion 2, and the valve portion 2 is accommodated in the accommodation space 15 separately from the main body portion 10, which is different from the first embodiment. Otherwise, it is the same as the first embodiment. Hereinafter, the description will be centered on the differences from the first embodiment, and the description of the same parts as the first embodiment will be omitted as appropriate.

[0056] FIG. 6 shows the valve device 100 according to the second embodiment. FIG. 7 shows a top view of the closing portion 1. FIG. 8 shows a cross-sectional view taken along the IIIV-IIIV arrow in FIG. 7. Note that FIG. 6 shows the valve device 100 in a state where its holding portion 3 is fixed to the body surface H of a patient who is the fixation target.

[0057] In this valve device 100, within the main body portion 10 of the closing portion 1, there are formed an accommodation space 15 that forms a part of the flow path 90 and houses the valve portion 2, through holes 16, 16 formed along the width direction and communicating the accommodation space 15 with the outside, and through holes 19, 19 formed along the front - rear direction.

[0058] As shown in FIG. 6, the accommodation space 15 may be formed, for example, as a rectangular parallelepiped - shaped space whose longitudinal direction is along the front - rear direction.

[0059] The through holes 19, 19 form the flow path 90. The through holes 19, 19 may be connection portions to which the infusion tube 95 (see FIG. 5) is connected. The through holes 19, 19 are respectively connected to and communicate with one end side and the other end side of the accommodation space 15 in the front - rear direction within the main body portion 10. The through holes 19, 19 may be arranged in a straight line. The through holes 19, 19 may be arranged at the central portion of the main body portion 10 in the width direction.

[0060] The through holes 16, 16 may be connected to one end side and the other end side of the accommodation space 15 in the width direction within the main body portion 10. The through holes 16, 16 may be arranged at the central portion of the main body portion 10 in the front - rear direction.

[0061] The valve portion 2 has valve bodies 20, 20 arranged on one side and the other side in the width direction. The valve bodies 20, 20 have valve elements 21, 21 for closing the flow path, elastic members 25, 25 as elastic portions for urging the valve elements 21, 21 in a direction approaching each other, ring portions 23, 23 as engaged portions, and bridging portions 22, 22 connecting the ring portions 23, 23 and the valve elements 21, 21. The valve elements 21, 21 and the elastic members 25, 25 are housed in the accommodation space 15. The bridging portions 22, 22 are inserted through the through holes 16, 16.

[0062] The valve element 21 may be, for example, a rectangular parallelepiped - shaped member. It is preferable that the length in the thickness direction and the length in the front - rear direction of the valve element 21 are the same as or slightly smaller than the length in the thickness direction and the length in the front - rear direction of the accommodation space 15.

[0063] The annular portions 23, 23 have their through holes (an example of hole portions) arranged along the thickness direction.

[0064] The elastic member 25 may be a member having elasticity such as a coil spring that supports one end in the width direction on the inner wall of the accommodation space 15 and biases the valve body 21 on the other end side.

[0065] The valve bodies 21, 21 are accommodated in the accommodation space 15. When the closing portion 1 is not attached to the seat portion 30 (see FIG. 6) (see FIGS. 7 and 8), the valve bodies 21, 21 are biased by the elastic members 25, 25 and the valve bodies 21, 21 come into contact with each other, and the valve portion 2 is in a closed state (closed valve state). In the state where the valve portion 2 is closed, the valve bodies 21, 21 block the through holes 16, 16, and the flow path 90 is closed.

[0066] As shown in FIG. 6, when the closing portion 1 is attached to the holding portion 3, the valve bodies 21, 21 separate (the valve portion 2 expands in the width direction), the through holes 16, 16 communicate with the accommodation space 15, and the flow path 90 opens. To attach the closing portion 1 to the holding portion 3, the user may pull the annular portions 23, 23 outward in the width direction and bias the main body portion 10 toward the seat portion 30 while inserting the rod-shaped portions 31a, 31a of the holding portion 3 into the holes of these annular portions 23, 23.

[0067] By inserting the rod-shaped portions 31a, 31a into the holes of the annular portions 23, 23, the rod-shaped portions 31a, 31a move the valve bodies 20, 20 in a direction away from each other in the width direction against the biasing force of the elastic members 25, 25, widen the space between the valve bodies 21, 21, and open the flow path 90 (the valve portion 2 opens). As a result, the through holes 19, 19 communicate with the accommodation space 15, and the accommodation space 15 and the through holes 19, 19 as the flow path 90 open. In this way, the holding portion 3 opens the valve portion 2 against the biasing force of the elastic member 25 as the elastic portion.

[0068] When the rod-shaped portions 31a, 31a are fitted into the ring portions 23, 23, the rod-shaped portions 31a, 31a move the valve bodies 20, 20 in a direction away from each other in the width direction against the biasing force of the elastic members 25, 25, and maintain the state where the space between the valve bodies 21, 21 is widened (while widening the valve portion 2 in the width direction), that is, the open valve state of the valve device 100 (valve portion 2) is maintained. As a result, the accommodation space 15 and the through holes 19, 19 as the flow path 90 are maintained in an open state.

[0069] When a force in a direction away from the holding portion 3 is applied to the closing portion 1, the rod-shaped portions 31a, 31a come out of the ring portions 23, 23, and the closing portion 1 detaches from the holding portion 3 (release of fixation of the infusion route). As a result, the valve portion 2 automatically closes and the valve device 100 switches to the closed valve state, and the supply of the infusion is stopped (see FIGS. 7 and 8).

[0070] (Third Embodiment) In the second embodiment described above, in the valve device 100 shown in FIG. 6, when the closing portion 1 is attached to the seat portion 30, the rod-shaped portions 31a, 31a widen the valve portion 2 in the width direction and maintain the open valve state, and when the closing portion 1 detaches from the seat portion 30, the valve portion 2 switches to the closed valve state (see FIGS. 7 and 8). In the third embodiment, the mechanism for switching the valve device 100 between the open valve state and the closed valve state by the valve portion 2 is different, and the other parts are the same as those in the second embodiment. Hereinafter, the mechanism for switching the valve portion 2 between the open valve state and the closed valve state in the third embodiment will be mainly described, and the description of the same parts as those in the second embodiment will be omitted as appropriate.

[0071] FIGS. 9 and 10 show explanatory diagrams (cross-sectional views) of the internal structure of the valve device 100 according to the third embodiment. FIG. 9 is an explanatory diagram of the internal structure of the valve device 100 in the closed valve state when viewed along the width direction. FIG. 10 is an explanatory diagram of the internal structure of the valve device 100 in the open valve state when viewed along the width direction.

[0072] In the main body portion 10 of the closing portion 1, a through hole 14 that communicates the accommodation space 15 with the outside is formed. The through hole 14 is formed at an end portion of the main body portion 10 closer to the seat portion 30 and penetrates to the accommodation space 15 along the thickness direction. The through hole 14 may be disposed, for example, at the central portion of the main body portion 10 in the width direction and the front-rear direction.

[0073] In the seat portion 30, a rod-shaped portion 31b is formed as the engaging portion 31. The rod-shaped portion 31b may stand perpendicularly from the plate surface of the seat portion 30.

[0074] The valve portion 2 is accommodated in the accommodation space 15 and includes a rectangular valve main body 20, a through hole 29 that penetrates the valve main body 20, and an elastic member 25 that biases the valve main body 20 toward the seat portion 30 in the thickness direction. The axial direction of the through hole 29 is disposed along the front-rear direction. The through hole 29 may be disposed at the central portion of the main body portion 10 in the width direction. When the through hole 29 communicates with the through holes 19, 19, it constitutes a flow path 90.

[0075] The valve main body 20 has a length in the front-rear direction and a length in the width direction that are the same as or slightly smaller than the length in the front-rear direction and the length in the width direction of the accommodation space 15, and a length in the thickness direction that is smaller than the length in the thickness direction of the accommodation space 15. When the closing portion 1 is not attached to the seat portion 30, the valve main body 20 is biased by the elastic member 25 and is located at the lower end portion of the accommodation space 15 (the side closer to the seat portion 30 in the accommodation space 15). In this state, the through hole 29 does not communicate with the through holes 19, 19.

[0076] As shown in FIG. 10, when the closing portion 1 is attached to the holding portion 3, the rod-shaped portion 31b is inserted into the through hole 14, and its tip reaches the inside of the accommodation space 15, and the valve main body 20 is pushed upward in the thickness direction against the biasing force of the elastic member 25, away from the seat portion 30. As a result, the through hole 29 moves to a position where it communicates with the through holes 19, 19, the through hole 29 communicates with the through holes 19, 19, and the valve portion 2 opens. In this way, the holding portion 3 opens the valve portion 2 against the biasing force of the elastic member 25 as an elastic portion.

[0077] When the rod-shaped portion 31b pushes up the valve body 20 along the thickness direction through the through-hole 14 in a direction away from the seat portion 30, the valve portion 2 is maintained in an open state. Thereby, the through-hole 29 and the through-holes 19, 19 as the flow path 90 are maintained in a communicating state.

[0078] When a force in a direction away from the holding portion 3 is applied to the closing portion 1, the rod-shaped portion 31b comes out of the through-hole 29, and the closing portion 1 is detached from the holding portion 3 (fixing release of the infusion route). As a result, the valve portion 2 automatically closes, the valve device 100 switches to a closed state, and the supply of the infusion liquid is stopped.

[0079] As described above, it is possible to provide a valve device and a liquid feeding system that automatically stop the supply of the infusion liquid when the fixing of the infusion route is released regardless of the intention of the user on the medical treatment side.

[0080] 〔Another Embodiment〕 (1) In the above first embodiment, the case where the through-hole 11 for the flow path, which is the space in the valve portion 2, forms a part of the flow path 90 as in the valve device 100 of the first embodiment (see FIG. 1) has been described. However, in the valve device 100, it is not essential that a part of the flow path 90 is formed in the valve portion 2.

[0081] For example, as shown in FIGS. 11 and 12, an infusion tube 95 as the flow path 90 is inserted into the through-hole 11 for the flow path, and the infusion tube 95 is crushed from the outside by the valve portion 2 (the through-hole 11 for the flow path) without directly contacting the liquid flowing through the infusion tube 95 to close the flow path 90, and the flow path 90 may be opened in a state where the valve portion 2 is open. In this case, the valve portion 2 (the valve bodies 21, 21) serves as a clamping portion that clamps the tube 95 having the flow path 90 to close the flow path 90. The holding portion 3 opens the valve portion 2 as the clamping portion, releases the infusion tube 95, and opens the flow path 90. In this way, the valve device 100 can also be used by mounting the infusion tube 95 having the flow path 90.

[0082] When using the valve device 100 with the infusion tube 95 having the flow path 90 attached, the liquid feeding system 200 described in the above embodiment includes this valve device 100, the infusion tube 95 attached to the valve device 100, and a liquid flow monitoring device 71 (see FIG. 5) that monitors the flow state of the liquid flowing through the infusion tube 95. The liquid flow monitoring device 71 may be configured to give a notification when the flow of the liquid stops.

[0083] (2) In the above embodiment, the case where a part of the flow path 90 is formed in the main body portion 10 of the valve device 100 as in the second embodiment and the third embodiment has been described. However, in the valve device 100, it is not essential that a part of the flow path 90 is formed in the main body portion 10.

[0084] For example, as shown in the explanatory diagrams (cross-sectional views) of the internal structure of the closing portion 1 and the valve portion 2 shown in FIGS. 13 and 14, an infusion tube 95 as the flow path 90 is inserted into the main body portion 10, and the infusion tube 95 is crushed by the valve portion 2 (the through-hole 11 for the flow path) to close the flow path 90 (see FIG. 13). Also, the flow path 90 may be opened with the valve portion 2 open (see FIG. 14). More specifically, the infusion tube 95 may be inserted between the valve bodies 21, 21, and the flow path 90 inside the infusion tube 95 may be crushed by the valve portion 2 (between the valve bodies 21, 21) to close the flow path 90. In this case, the valve portion 2 (the valve bodies 21, 21) serves as a clamping portion that clamps the infusion tube 95 having the flow path 90 to close the flow path 90. The holding portion 3 opens the valve portion 2 serving as the clamping portion and releases the infusion tube 95 to open the flow path 90. In this way, the valve device 100 can also be used with the infusion tube 95 having the flow path 90 attached.

[0085] When inserting the infusion tube 95 between the valve bodies 21, 21 as described above and crushing the flow path inside the infusion tube 95 by the valve portion 2 (between the valve bodies 21, 21) to close the flow path 90, the surfaces of the opposing sides (the inner surfaces in the width direction) of the valve bodies 21, 21 may be formed as convex portions 21a, 21a that protrude along the width direction. Thereby, the infusion tube 95 can be firmly crushed and its flow path 90 can be surely closed.

[0086] When using the valve device 100 with the infusion tube 95 having the flow path 90 attached, the liquid feeding system 200 described in the above embodiment includes this valve device 100, the infusion tube 95 attached to the valve device 100, and a liquid flow monitoring device 71 (see FIG. 5) that monitors the flow state of the liquid flowing through the infusion tube 95. The liquid flow monitoring device 71 may be configured to give an alarm when the liquid flow stops.

[0087] (3) In the above first embodiment, it was explained that although the rod-shaped portion 31a may penetrate the through hole 13a, it is not essential to penetrate. The rod-shaped portion 31a may be sized to fit into the through hole 13a without penetrating it. In this way, it becomes easier for the rod-shaped portion 31a to come out of the through hole 13a, and when the patient attempts self-removal, it becomes easier for the closing portion 1 to detach from the holding portion 3. As a result, when the patient attempts self-removal, the flow path 90 can be quickly closed to ensure the safety of the patient.

[0088] (4) In the above first embodiment, the case where the rod-shaped portion 31a is a straight cylindrical rod was illustrated and described. However, in the valve device 100, the rod-shaped portion 31a is not limited to being a straight cylindrical rod. For example, as shown in FIG. 15, in the valve device 100, a diameter-expanded portion 31c may be formed on the rod-shaped portion 31a. Note that FIG. 15 is a side view of the valve device 100 in use as viewed from the side along the width direction.

[0089] In Fig. 15, in the valve device 100, a case is illustrated where a diameter-expanded portion 31c is formed at the tip of a rod-shaped portion 31a that fits into the through-hole 13a and has a length that does not penetrate. By forming the diameter-expanded portion 31c in the through-hole 13a, the diameter-expanded portion 31c interferes with the inner wall of the through-hole 13a, making it difficult for the rod-shaped portion 31a to accidentally come out of the through-hole 13a. Thereby, it is possible to avoid the closing portion 1 accidentally detaching from the holding portion 3. In this case, further, by making the base end portion of the through-hole 13a a diameter-reduced portion 13b, the effect of preventing the rod-shaped portion 31a from accidentally coming out of the through-hole 13a can be enhanced. In a state where the main body portion 10 is attached to the seat portion 30, it is preferable that the diameter-expanded portion 31c and the diameter-reduced portion 13b are separated. The distance by which the diameter-expanded portion 31c and the diameter-reduced portion 13b are separated is, for example, 75% or more and 200% or less of the inner diameter of the through-hole 13a, preferably 100% or more and 200% or less.

[0090] The distance by which the diameter-expanded portion 31c and the diameter-reduced portion 13b are separated becomes so-called play. By providing such play, when a force in a direction away from the holding portion 3 is applied to one end side of the main body portion 10 of the closing portion 1, the closing portion 1 becomes more likely to detach from the holding portion 3. For example, as shown in the explanatory diagram of Fig. 16, when a force in a direction away from the holding portion 3 is applied to one end side of the main body portion 10 of the closing portion 1, due to the play between the diameter-expanded portion 31c and the diameter-reduced portion 13b, the closing portion 1 becomes more likely to tilt with respect to the seat portion 30 while the rod-shaped portion 31a cannot completely come out of the through-hole 13a. As a result, the end portion on the other end side of the main body portion 10 gets caught on the seat portion 30, and in some cases, the closing portion 1 becomes more likely to detach from the holding portion 3 (the rod-shaped portion 31a becomes more likely to come out of the through-hole 13a) by the principle of a lever (see Fig. 17). Therefore, when the patient tries to self-remove by pulling the infusion tube 95 or the like and a force in a direction away from the holding portion 3 is applied to one end side of the main body portion 10, the closing portion 1 can easily detach from the holding portion 3, and the flow path 90 can be quickly closed to ensure the safety of the patient.

[0091] (5) In the above first embodiment, the case where the rod-shaped portion 31a of the valve device 100 is a straight cylindrical rod has been described as an example. However, the rod-shaped portion 31a is not limited to being a straight cylindrical rod. For example, as shown in the cross-sectional view of the valve device 100 in FIG. 18, a small protrusion 31d extending from the side surface of the rod-shaped portion 31a may be provided at the tip of the rod-shaped portion 31a. Thereby, the protrusion 31d bites into the inner surface of the through-hole 13a, and the rod-shaped portion 31a is prevented from inadvertently coming out of the through-hole 13a. Thereby, it is possible to avoid the closing portion 1 inadvertently detaching from the holding portion 3. Note that FIG. 18 shows a cross-section corresponding to the cross-section shown in FIG. 2.

[0092] Since the protrusion 31d is smaller and more breakable than the rod-shaped portion 31a, when a force in a direction away from the holding portion 3 is applied to the closing portion 1 with a magnitude equal to or greater than a certain value, the protrusion 31d interferes with the inner surface of the through-hole 13a and breaks or is shaved off and becomes smaller. Therefore, the protrusion 31d does not overly inhibit the rod-shaped portion 31a from coming out of the through-hole 13a.

[0093] When the rod-shaped portion 31a comes out of the through-hole 13a, the protrusion 31d breaks or is shaved off and does not maintain its original shape. Therefore, by checking the shape of the protrusion 31d, it becomes possible to determine whether the valve device 100 has been used or not.

[0094] (6) In the above first embodiment, the case where the engaging portion 31 is a convex portion (rod-shaped portions 31a, 31a) extending from one plate surface of the seat portion 30 has been described as an example. And the engaged portion that engages with the engaging portion 31 is the hole portion 13 (through-holes 13a, 13a) of the main body portion 10. However, the relationship between the engaging portion and the engaged portion (the relationship between the convex portion and the hole portion) may be reversed.

[0095] (7) In the above second embodiment, the case where the engaging portion 31 is a convex portion (rod-shaped portions 31a, 31a) extending from one plate surface of the seat portion 30 has been described as an example. And the engaged portion that engages with the engaging portion 31 is the ring portions 23, 23 as the hole portions of the main body portion 10. However, the relationship between the engaging portion and the engaged portion (the relationship between the convex portion and the hole portion) may be reversed.

[0096] (8) In the above-described first embodiment, the liquid feeding system 200 shown in FIG. 5 includes the liquid flow monitoring device 71 and the valve device 100, and the case where the liquid flow monitoring device 71 notifies the stop of the liquid flow when the flow of the infusion stops has been exemplified and described. However, the valve device 100 may be provided with a notification unit that notifies when the opening / closing state of the valve unit 2 changes. In this case, the valve device 100 may further include a sensor (for example, a proximity sensor) that detects that the opening / closing state of the valve unit 2 has changed, and the notification unit may notify that the opening / closing state of the valve unit 2 has changed based on the detection result of this sensor. As this notification, the notification unit may emit a sound such as a warning sound from a speaker or turn on a warning lamp to emit light. Further, as this notification, the notification unit may send out an electric signal including information indicating that the opening / closing state of the valve unit 2 has changed. In this case, the notification unit may be a communication unit that sends out the electric signal. The electric signal may be sent out toward a receiver via an electric wire or may be sent out as a radio wave signal. The electronic device that has received the electric signal may notify a warning sound or may display a warning on the screen of the electronic device.

[0097] Note that the configurations disclosed in the above embodiments (including other alternative embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs. Further, the embodiments disclosed in this specification are examples, and the embodiments of the present disclosure are not limited thereto, and can be appropriately modified within the scope not departing from the object of the present disclosure.

Industrial Applicability

[0098] The present disclosure can be applied to a valve device and a liquid feeding system.

Explanation of Signs

[0099] 1: Closing portion 10: Main body portion 100: Valve device 11: Through hole for flow path 13: Hole portion 13a: Through hole 13b: Reduced diameter portion 14: Through-hole 15: Accommodation space 16: Through-hole 19: Through-hole 2: Valve part 20: Valve body 200: Liquid delivery system 21: Valve element 21a: Protrusion 22: Bridging part 23: Ring part 25: Elastic member 29: Through-hole 3: Holding part 30: Seat part 31: Engaging part 31a: Rod-shaped part 31b: Rod-shaped part 31c: Diameter-expanded part 31d: Protrusion 4: Fixing part 71: Liquid flow monitoring device 78: Drip chamber 79: Infusion bag 90: Flow path 91: Inlet side tube 92: Outlet side tube 95: Infusion tube H: Body surface L: Direction V: Direction W: Direction

Claims

1. a valve portion of a flow path; a closing portion that closes the flow path by closing the valve portion; a holding portion that opens the valve portion to open the flow path, and comprising: the holding portion includes: a seat portion on which the closing portion is mounted; an engaging portion that holds the valve portion in an open state with the closing portion mounted on the seat portion. A valve device.

2. The valve portion has an elastic portion that biases the valve portion in a closing direction, The holding portion resists the biasing force of the elastic portion to open the valve portion. The valve device according to claim 1.

3. The valve portion has an engaged portion that engages with the engaging portion when mounted on the seat portion, The engaged portion opens the valve portion when engaged with the engaging portion. The valve device according to claim 1.

4. The seat portion is formed in a plate shape, and the engaging portion is a convex portion extending from the plate surface of the seat portion, The engaged portion is a hole portion into which the convex portion fits. The valve device according to claim 3.

5. The valve device according to claim 1, further comprising a fixing portion for fixing the holding portion to a fixing target.

6. The valve device according to claim 1, further comprising a notification portion that notifies when the opening / closing state of the valve portion changes.

7. The valve device according to claim 1, further comprising a communication portion that transmits a signal for notifying the change when the opening / closing state of the valve portion changes.

8. The valve portion has a clamping portion that clamps a tube having the flow path to close the flow path, The holding portion opens the clamping portion to open and release the tube. The valve device according to any one of claims 1 to 7.

9. The valve device according to any one of claims 1 to 7, and a liquid flow monitoring device that monitors the flow state of the liquid flowing through the flow path, and The liquid flow monitoring device is a liquid supply system that notifies a stop of liquid flow when the liquid flow stops.

10. The valve device according to claim 8, and a tube having the flow path, mounted on the valve device, and a liquid flow monitoring device that monitors the flow state of the liquid flowing through the tube, and The liquid flow monitoring device is a liquid supply system that notifies a stop of liquid flow when the liquid flow stops.

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