WO2011055790A1

WO2011055790A1 - One-way valve with opening function, tube unit provided with the one-way valve, and drug solution injection system

Info

Publication number: WO2011055790A1
Application number: PCT/JP2010/069711
Authority: WO
Inventors: 由美子吹越
Original assignee: 株式会社根本杏林堂
Priority date: 2009-11-09
Filing date: 2010-11-05
Publication date: 2011-05-12
Also published as: CN102686254A; CN102686254B; JP5800713B2; JPWO2011055790A1

Abstract

Disclosed is a one-way valve wherein, although the flow of liquid in only one direction is usually allowed, a flow path can be opened as necessary. Specifically disclosed is a one-way valve (250) which has a casing comprising a valve chamber in which an inlet port (255) and outlet port (261) of liquid are open, a valve body (270) disposed within the valve chamber, and an opening button (265) that is mounted on the casing in a manner so as to allow movement, and is manually operated. The valve body (270) has flexibility, and opens the inlet port (255) when the liquid flows into the valve chamber from the inlet port (255) side, but blocks the inlet port (255) when the liquid flows into the valve chamber from the outlet port (261) side. The opening button (265) is formed integrally with an action unit (266) that deforms the valve body (270) so that the inlet port (255) is opened by being brought into contact with the valve body (270) by the movement.

Description

One-way valve with opening function, tube unit equipped with the one-way valve, and chemical solution injection system

The present invention relates to a one-valve structure suitably used for a chemical solution injection system for injecting a chemical solution filled in a chemical solution container through a tube.

Medical diagnostic imaging apparatuses include a CT (Computed Tomography) scanner, an MRI (Magnetic Resonance Imaging) apparatus, a PET (Positron Emission Tomography) apparatus, an angiographic apparatus, and an MRA (MR Angio) apparatus. When taking an image of a subject using these devices, a chemical such as a contrast medium or physiological saline is often injected into the subject.

It is common to automatically inject a chemical solution into a subject using a chemical solution injection device. The chemical solution injector includes an injection head to which a syringe filled with a chemical solution is detachably mounted, and an injection control unit that controls the operation of the injection head. The syringe has a cylinder and a piston inserted in the cylinder so as to be movable in the axial direction, and the liquid medicine is filled in the cylinder. The injection head has a piston drive mechanism that operates to advance at least the piston of the attached syringe relative to the cylinder.

When a contrast medium and physiological saline are used as the chemical solution, an injection head having two piston drive mechanisms is often used so that two syringes can be attached and each syringe can be operated individually. Each of the two syringes is filled with a contrast medium and physiological saline, and each syringe is connected to a branch tube branched into two at the end side. A catheter is connected to the tip of the branch tube, and a contrast medium and physiological saline can be injected through the branch tube.

Saline is mainly used to boost the injected contrast agent after injecting the contrast agent, flush the tube to prevent blood clotting in the tube, and inject at the same time as the contrast agent. Used to dilute contrast agent.

When injecting a chemical solution using such a chemical solution injection system, since the contrast agent has a high viscosity, the chemical solution is often injected at a high pressure. When one chemical solution is injected at a high pressure, the high pressure is transmitted to the other syringe side via the branch tube, whereby the piston of the other syringe is retracted, and one syringe is filled in the syringe. There is a risk of introducing chemicals.

In order to prevent such chemicals from flowing between the syringes, Patent Document 1 discloses that when one piston drive mechanism is in the forward state and the other piston drive mechanism is in the stopped state, the other piston drive is performed. There has been disclosed a chemical injection device having a reverse prohibiting means for prohibiting the reverse of the mechanism. As an example of the reverse prohibition means, Patent Document 1 discloses an electromagnetic brake.

Patent Document 1: Japanese Patent Application Laid-Open No. 2002-102343

However, when the chemical solution injection system is used for an MRI apparatus, a part that includes a magnetic substance such as an electromagnetic brake cannot be used as a part that constitutes an injection head that is usually installed near the MRI apparatus. Therefore, as a simpler configuration, it is conceivable to install a one-way valve at each end of the branch tube so as to allow only the flow of the chemical solution from the syringe side to the distal end side of the branch tube. Thereby, the inflow of the chemical solution from another syringe into a certain syringe is prevented.

By the way, in the chemical solution injection device, in order to confirm whether or not the catheter is surely inserted into the blood vessel, the piston of one syringe may be retracted to reverse the chemical solution in the branch tube. If blood flows into the tube by this operation, the catheter is inserted into the blood vessel. However, if a one-way valve is attached to each end of the branch tube, the piston cannot be retracted to reverse the chemical solution in the branch tube.

Therefore, an object of the present invention can be suitably used for a chemical solution injection system that individually or simultaneously injects chemical solutions in a plurality of chemical solution containers via a branch tube, and normally allows a liquid flow in only one direction. Is to provide a one-way valve that can open the flow path as necessary, and a system using the one-way valve.

In order to achieve the above object, a one-way valve with an opening function according to the present invention is arranged in a valve chamber having a valve chamber in which a liquid inflow port and an outflow port are opened, and the liquid flows from the inflow side to the valve chamber. An inflow port is opened when flowing in, but a flexible valve body that closes the inflow port by liquid flowing into the valve chamber from the outflow side, and an operation that is movably attached to the casing and manually operated And an operation member having an action portion that deforms the valve body so that the valve body is brought into contact with the valve body by movement to open the inlet.

The tube unit of the present invention has a tube having a tip and an end, and the one-way valve with an opening function of the present invention connected to the end of the tube.

Further, the chemical solution injection system of the present invention is a chemical solution injection system that injects a chemical solution in a chemical solution container through a tube, and includes a chemical solution injection device for injecting a chemical solution filled in the chemical solution container, and a tip and a terminal. And a one-way valve with an opening function according to the present invention in which the outlet side is connected to the end of the tube and the inlet side is directly or indirectly connected to the chemical solution container.

According to the present invention, the one-way valve normally functions as a general one-way valve that allows liquid to flow from the inlet side only to the outlet side, but if necessary, the operation member is manually operated. By doing so, the flow path can be opened. Therefore, the one-way valve of the present invention is usually required to prevent the backflow of the chemical solution, but can be particularly preferably used for a chemical solution injection system that may cause the chemical solution to flow back as necessary.

When such a one-way valve is applied to a chemical injection system that can inject a plurality of types of chemicals using a branch tube, it is possible to prevent the chemical from flowing into the other end of the branch tube during the injection of any chemical. Even if it is set as a structure, it can be confirmed easily whether the front end side of a branch tube is normally inserted in the test subject by opening a one-way valve. Moreover, all the parts and units used in the chemical solution injection system can be made of a non-magnetic material, whereby the chemical solution injection system of the present invention can be used in combination with an MRI apparatus that generates a strong magnetic field.

1 is a perspective view of a fluoroscopic imaging system according to an embodiment of the present invention. It is a perspective view of the chemical injection device shown in FIG. It is a perspective view which shows the injection | pouring head shown in FIG. 2 with the syringe with which it is mounted | worn. It is a perspective view of the one-way valve with an opening function shown in FIG. It is a longitudinal cross-sectional view along the flow direction of the liquid of the one-way valve shown in FIG. It is a figure which shows arrangement | positioning of the annular rib of a one-way valve shown in FIG. 4, and several outer side ribs. It is the figure which looked at the cover member which comprises a part of casing of the one-way valve shown in FIG. 4 from the valve chamber side. FIG. 6 is a cross-sectional view similar to FIG. 5 when liquid is introduced from the inflow pipe side. It is sectional drawing similar to FIG. 5 in the state by which the open button was pushed. It is a perspective view of the other example of the one-way valve with an open function.

Next, an embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1, there is shown a fluoroscopic imaging system 1000 according to an embodiment of the present invention, which includes a chemical solution injection device 100 and a fluoroscopic imaging device 300. The fluoroscopic imaging device 300 and the chemical liquid injector 100 are connected to each other so that their operations can be synchronized. The fluoroscopic imaging apparatus 300 may be any imaging apparatus such as an X-ray CT apparatus, an MRI apparatus, a PET apparatus, an angio apparatus, or an MRA apparatus.

The fluoroscopic imaging apparatus 300 includes a scanner 301 that executes an imaging operation, and an imaging control unit 302 that controls the operation of the scanner 301. In FIG. 1, all the components of the fluoroscopic imaging system 1000 are shown to be disposed in the same room. However, when actually capturing an image of a subject, the imaging control unit 302 includes a scanner 301 and a chemical solution. It is arranged in a separate chamber from the injection device 100.

For example, as shown in FIG. 2, the chemical injection device 100 includes an injection head 110 that is mounted on an upper portion of a stand 111 via an arm 112, and an injection control unit 101 that is connected to the injection head 110 with a cable 102. ing. The injection control unit 101 includes a main operation panel 103, a touch panel 104 serving as a display unit and an input unit, a hand unit 107 serving as an auxiliary input unit connected to the main body of the injection control unit 101 with a cable 108, and the like. ing.

As shown in FIG. 3, the injection head 110 has two concave portions 114 formed as syringe holding portions on the upper surface of the head main body 113, and the syringes 200 C and 200 P, which are drug solution containers, are removable in the concave portions 114, respectively. It is attached to. The syringes 200 C and 200 P have a cylinder 210 and a piston 220. Each of the syringes 200C and 200P is filled with a chemical solution. For example, one syringe 200C can be filled with a contrast medium, and the other syringe 200P can be filled with physiological saline.

The injection head 110 is provided with two piston drive mechanisms 130 that are driven independently of each other to operate the pistons 220 of the syringes 200 C and 200 P attached to the recesses 114, corresponding to the recesses 114. . These piston driving mechanisms 130 operate the pistons 220 of the syringes 200C and 200P respectively attached to the recesses 114, thereby separately or simultaneously applying the contrast medium and the physiological saline filled in the syringes 200C and 200P to the subject. Can be injected.

As the mechanism for holding the syringes 200C and 200P of the injection head 110 in the head main body 113 and the piston drive mechanism 130, a known mechanism generally used for this type of injection device can be adopted.

The branch tube unit is connected to the syringes 200C and 200P so that the contrast medium and physiological saline filled in the syringes 200C and 200P can be injected into the subject. For example, a catheter (not shown) is connected to the distal end of the branch tube unit, and a distal side of the branch tube unit is branched into two for connection with the syringes 200C and 200P, and a syringe is connected to each end of the branch tube 230. 200C, 200P, and one-

side valves

240, 250 connected in a direction allowing flow of the drug solution from the catheter side to the catheter side. Thus, the one-

way valves

240 and 250 are connected to the end of the branch tube 230, so that the branch tube 230 is connected to the syringes 200C and 200P by connecting the one-

valves

240 and 250 to the syringes 200C and 200P. Is done.

A system in which the syringes 200C and 200P and the branch tube unit are combined with the chemical injection device 100 is referred to as a chemical injection system in the present invention. The syringes 200 C and 200 P may be a type of syringe that is filled with a chemical solution at a medical site, or may be a prefilled type syringe that is provided to the medical site in a state of being filled with a chemical solution by a manufacturer. The syringes 200C and 200P, the branch tube 230 and the one-

side valves

240 and 250 are provided separately, or a combination of the branch tube 230 and the one-

side valves

240 and 250 is provided as a branch tube unit, or a prefilled type syringe 200C. , 200P, the branch tube 230 and the one-

way valves

240, 250 can be provided as a syringe kit, or can be provided in any combination. When the combination of the branch tube 230 and the one-

side valves

240 and 250 is provided as a branch tube unit, the branch tube 230 and the one-

side valves

240 and 250 may be connected in advance or may not be connected. Similarly, in the syringe kit, the syringes 200C and 200P, the branch tube 230, and the one-

side valves

240 and 250 may be connected in advance or may not be connected.

What is important here is that the one-way valve 240 connected to the contrast medium syringe 200 C is a general one-way valve that allows the flow of liquid from the distal end side of the branch tube 230 only to the distal end side. The one-way valve 250 connected to the saline syringe 200P can be switched between a state in which a fluid flows only in one direction and an open state in which a liquid can flow in both directions by a predetermined operation. It is a one-way valve with a function. Hereinafter, the openable one-way valve 250 will be described in detail.

As shown in FIG. 4, the one-way valve 250 includes a substantially cylindrical casing 251 constituting a valve chamber, an inflow pipe 253 extending from one end of the casing 251, an outflow pipe 259 extending from the other end of the casing 251, And an open button 265 provided on the casing 251. The inflow pipe 253 is connected to the tip of the syringe 200P (see FIG. 3), and the outflow pipe 259 is connected to the end of the branch tube 230 (see FIG. 3). These connections are preferably a luer lock type connection structure, and luer lock type male threads are formed at the tips of the inflow pipe 253 and the outflow pipe 259, respectively. Further, as shown in FIG. 10, when one or more blade portions 259a extending radially outward from the outer peripheral surface of the outflow pipe 259 are formed integrally with the outflow pipe 259, and the one-way valve 250 is connected to the syringe. If the one valve 250 can be rotated with respect to the syringe by placing a finger on the blade 259a, the one valve 250 and the syringe can be easily connected. Although FIG. 10 shows an example in which the blade part 259a is formed in the outflow pipe 259, the blade part (not shown) may be formed in the inflow pipe 253.

As shown in FIG. 5, the casing 251 includes a casing main body 252 in which an inflow pipe 253 is formed, and a lid member 258 in which an outflow pipe 259 is formed and is liquid-tightly joined to the casing main body 252. By connecting the casing body 252 and the lid member 258 in a liquid-tight manner, the inflow port 255 communicating with the inflow tube 253 and the outflow port 261 communicating with the outflow tube 259 face each other inside the casing 251. A valve chamber is constructed.

In the valve chamber, an annular rib 254 is formed in the casing main body 252 so as to surround the inflow port 255, and a plurality of outer ribs 256 are formed on the outer side in the radial direction. The outer ribs 256 are higher than the annular ribs 254, and are arranged radially around the annular ribs 254, as shown in FIG.

In the valve chamber, a flexible valve body 270 is disposed. The diameter of the valve body 270 is larger than the outer diameter of the annular rib 254, and one main surface of the valve body 270 is supported on the front end surface of the annular rib 254. That is, the annular rib 254 serves as a valve seat. Further, the diameter of the valve body 270 is smaller than the diameter of the space formed inside the plurality of outer ribs 256, and the plurality of outer ribs 256 are configured so that the valve body 270 cannot move substantially in the radial direction. ing.

On the other hand, a valve body presser 260 is formed on the lid member 258 so as to face the valve body 270 in the valve chamber. As shown in FIG. 5 and FIG. 7, the valve body presser 260 is a structure in which two ribs having an isosceles triangular cross section whose bottom side crosses the outlet 261 intersect each other at the center in the length direction of the bottom side. have. The apex of the valve body presser 260 is located substantially in the center in the radial direction of the valve body 270 and is in contact with the valve body 270 or spaced apart from the valve body 270 with a slight gap. The central portion of the valve body 270 supported on the annular rib 254 by the presser 260 is held so that the valve body 270 cannot substantially move in the flow direction of the chemical liquid between the inflow port 255 and the outflow port 261. .

Due to the structure of the valve chamber as described above, when the chemical solution flows into the one-way valve 250 from the inflow pipe 253 side, the pressure of the flowing chemical solution acts on the valve body 270. At this time, since the central portion of the valve body 270 is held by the valve body presser 260 as described above, the outer periphery of the valve body 270 is deformed to the outflow pipe 259 side by the pressure of the chemical solution as shown in FIG. To do. Thereby, the inflow port 255 communicates with the valve chamber, and the chemical liquid can flow to the outflow pipe 259 side through the valve chamber.

On the contrary, when the chemical solution flows in from the outflow pipe 259 side, the valve body 270 is pressed against the annular rib 254 by the pressure as shown in FIG. 5, and the inflow port 255 is closed. Therefore, the flow of the chemical solution from the outflow pipe 259 side to the inflow pipe 253 side is prevented.

However, in the chemical solution injection system of this embodiment, the chemical solution may flow from the outflow tube 259 side to the inflow tube 253 side. In order to make it possible, the one-way valve 250 is provided with a manually operated release button 265.

The release button 265 is attached to the peripheral surface of the casing 251 as shown in FIG. 4 and is manually operated from the outside of the casing 251 by the operator.

Referring again to FIG. 5, the release button 265 is attached to the casing body 252 so as to be movable in the radial direction of the valve body 270, and is radially outward of the casing body 252 (in a direction away from the valve body 270) by the coil spring 268. ). The release button 265 is integrally formed with an action portion 266 that acts on the valve body 270 in the valve chamber when the release button 265 is pushed inward in the radial direction of the casing body 252. The action portion 266 is a rod-shaped portion extending in the moving direction of the release button 265 toward the valve chamber, and the tip portion enters the valve chamber through a through hole 257 formed in the peripheral surface of the casing body 252. is doing. In order to ensure the liquid tightness of the gap between the through hole 257 and the action part 266, an O-ring 267 is attached to the outer peripheral surface of the action part 266.

The release button 265 and the casing body 252 have an appropriate stopper structure that limits the movement range of the release button 265 to a predetermined range, and this stopper structure moves the release button 265 in the radial direction of the casing body 252. The range is limited. The movement range of the release button 265 is such that the operating portion 267 is separated from the outer peripheral end of the valve body 270 (see FIG. 5) and the valve body 270 is lifted up from the annular rib 254 until the outer peripheral portion of the valve body 270 is lifted. This is a range between the second position (see FIG. 9) where the action part 266 contacts the outer peripheral part of the valve body 270 so as to deform the outer peripheral part in the thickness direction of the valve body 270. When the release button 265 is pushed against the biasing force of the coil spring 268, the release button 265 is positioned at the second position. When the release button 265 is released, the release button 265 is moved by the biasing force of the coil spring 268. Return to the first position. That is, the release button 265 is positioned at the second position only while being pressed.

According to the structure of the release button 265 as described above, as shown in FIG. 9, when the release button 265 is pushed and the release button 265 is positioned at the second position, the action portion 266 is placed on the outer peripheral portion of the valve body 270. The valve body 270 is deformed in the thickness direction so that the valve body 270 is abutted and separated from a part of the annular rib 254. Thereby, the inflow port 255 communicates with the valve chamber. In this state, when the chemical liquid flows into the valve chamber from the outlet 259 side, the pressure of the flowed chemical liquid acts to press the valve body 270 against the annular rib 254, but the valve body 270 has an annular rib on the outer periphery by the action portion 266. The state of lifting from 254 is maintained. As a result, the chemical liquid that has flowed into the valve chamber can flow to the inflow pipe 253 through the inflow port 255. When the release button 265 is released, the release button 265 is positioned at the first position by the urging force of the coil spring 268, the action part 266 is separated from the valve body 270, and the valve body 270 corresponds to the direction in which the pressure of the chemical liquid acts. Since the behavior described above is shown, the chemical solution does not flow from the outflow pipe 259 side to the inflow pipe 253 side.

As described above, according to the one-way valve 250 of this embodiment, normally, the one-way valve 250 functions as a general one-way valve that enables the flow of the chemical liquid from the inflow pipe 253 side only to the outflow pipe 259 side. The flow path between the inflow pipe 253 and the outflow pipe 259 can be opened by an extremely simple operation by simply pressing the release button 265. In addition, since the central portion of the valve body 270 is held by the valve body presser 260, the valve body 270 can be stably and reliably deformed by the operation of the release button 265. Moreover, since the one-way valve 250 is opened only while the release button 265 is pressed, it is possible to prevent the one-way valve 250 from being opened when it is not necessary due to an operation error or the like. it can.

In order to further ensure the action of the action part 267 on the valve body 270, in this embodiment, the tip part of the action part 267 is downstream in the flow direction of the chemical in the valve chamber from the inflow pipe 253 side to the outflow pipe 259 side. The side part is cut diagonally to form a wedge shape. By forming the tip of the action part 267 in such a shape, after the action part 267 contacts the valve body 270 in the process in which the release button 265 moves from the first position to the second position, the action part The cut inclined surface of 267 acts on the valve body 270 to lift the outer peripheral portion of the valve body 270 from the annular rib 254 and open the inlet 255. As a result, the valve body 270 can be smoothly deformed as the release button 265 moves. Furthermore, in a state where the release button 265 is located at the second position, the deformed portion of the valve body 270 is supported by the inclined surface of the action portion 267, so that the open state of the one-way valve 250 can be reliably maintained. .

Further, the apex of the action portion 267 formed by making the cross section a wedge shape is located in the vicinity of the contact surface of the annular rib 254 with the valve body 270. Thereby, since the front-end | tip part of the action part 267 becomes easy to approach between the valve body 270 and the annular rib 254, a deformation | transformation of the valve body 270 can be started smoothly.

Next, an example of a procedure for injecting a chemical solution by the chemical solution injection system of this embodiment will be described from the stage after the two syringes 200C and 200P are mounted on the injection head 110.

At the stage where the syringes 200C and 200P are mounted on the injection head 110, the branch tube 230 is connected to the tips of the syringes 200C and 200P. The branch tube 230 has two one-

way valves

240 and 250 at each end branched so as to allow the flow of fluid from the distal end side to the distal end side. The syringes 200C and 200P It is connected to the branch tube 230 via 250. The syringe 200 C filled with the contrast agent is connected to the one-way valve 240, and the syringe 200 P filled with physiological saline is connected to the one-way valve 250. After the syringes 200 C and 200 P are mounted on the injection head 110, the operator appropriately drives each piston drive mechanism 130 to fill the branch tube 230 with the contrast medium and physiological saline, and bleed the branch tube 230. .

After releasing the air from the branch tube 230, the operator inserts a catheter connected to the tip of the branch tube 230 into the blood vessel of the subject. The operator then checks whether a catheter has been inserted into the subject's blood vessel. This confirmation is performed by operating the piston drive mechanism 130 for operating the syringe 200P to which the one-way valve 250 is connected to retract the piston 220 and let the liquid flow into the branch tube 230 from the catheter.

Prior to retracting the piston 220 of the syringe 200P, the operator presses the release button 265 of the one-way valve 250. While the release button 265 is being pressed, the liquid can be moved from the branch tube 230 side to the syringe 200P side. Therefore, the operator operates the piston drive mechanism 130 while pressing the release button 265. The piston 220 of the syringe 200P is retracted.

By retreating the piston 220 of the syringe 200P, it can be seen that if the liquid flowing into the branch tube 230 is blood, the catheter is normally inserted into the blood vessel of the subject. In other cases, it means that the catheter is not normally inserted into the blood vessel of the subject, so that the operator stops the piston drive mechanism 130 and releases the release button 265 of the one-way valve 250. The catheter is reinserted and the above confirmation procedure is repeated until the catheter is inserted into the subject's blood vessel.

When it is confirmed that the catheter is normally inserted into the blood vessel of the subject, the operator stops the piston drive mechanism 130 and releases the release button 265 of the one-way valve 250.

Next, the operator sets injection conditions for the chemical solution according to the test purpose of the subject. The injection conditions can be set using the main operation panel 103, the touch panel 104, or the like. When the operator performs a predetermined operation for starting the injection after setting the injection conditions, the injection control unit 101 controls the operation of the piston drive mechanism 130 in accordance with the set injection conditions, whereby the drug solution is injected into the subject. Is done.

In the injection of a chemical solution, normally, in order to reach the desired site with a small amount of contrast medium, physiological saline is injected after the contrast medium is injected, and the contrast medium is boosted by the physiological saline. Further, physiological saline may be used for flushing the branch tube 230.

In any case, while only the contrast medium is injected, the pressure due to the injection of the contrast medium acts not only on the distal end side of the branch tube 230 but also on the end on the side where the valve 250 is connected. However, during the injection of the contrast agent, the open button 265 of the one-way valve 250 is not pressed, and in this state, liquid cannot flow from the branch tube 230 side to the syringe 20P side. Therefore, it is possible to prevent the contrast medium from flowing between the branched portion of the branch tube 230 and the end on the side to which the one valve 250 is connected during the injection of the contrast medium. As a result, since a desired amount of contrast agent is reliably injected into the subject, the fluoroscopic imaging apparatus 300 can satisfactorily capture the fluoroscopic image of the subject. Further, since the inflow of the contrast agent to the end portion on the physiological saline side is prevented as described above, useless consumption of the contrast agent can be prevented.

Similarly, while injecting only physiological saline, the pressure due to the injection of physiological saline acts on the end portion of the branch tube 230 on the contrast agent side. However, since the syringe 200C and the end of the branch tube 230 are connected via the one-way valve 240, the side on which the one-valve 240 is connected from the branched portion of the branch tube 230 during the injection of physiological saline. It is possible to prevent the physiological saline from being injected between the ends.

As described above, according to the chemical solution injection system of the present embodiment, the two syringes 200C and 200P are connected to the branch tube 230 via the one

valves

240 and 250, respectively, and during the injection of one chemical solution, the branch tube While it is configured to prevent the inflow of the chemical solution to the other end side of 230, it is possible to easily confirm whether the catheter is normally inserted into the blood vessel of the subject by opening the one-way valve 250. .

In addition, since the one-way valve 250 is opened only while the release button 265 is pressed, it is possible to prevent the one-way valve 250 from being left open after the above confirmation. Furthermore, since the operation of the release button 265 is performed manually and no electromagnetic control is required, all the parts and units used in the chemical solution injection system can be made of a non-magnetic material. As a result, the chemical injection system of this embodiment does not cause any problems even when used with an MRI apparatus that generates a strong magnetic field.

Further, the one-way valve 250 of the present embodiment is configured such that the central portion of the valve body 270 is held by the valve body presser 260 and the flow path is opened by deformation of the outer peripheral portion of the valve body 270. 255 is only partially open. However, when the one-way valve 250 is used in the chemical solution injection system for the above-described use, the flow path is opened in order to visually check whether blood flows backward in the branch tube 230, and the liquid is syringed. The purpose is not to fill 200P. Therefore, the amount of the liquid flowing back in the one-way valve 250 may be small, and it is sufficient that a part of the inlet 255 is opened. In other words, by interposing the one-way valve 250 of the present embodiment between the syringe and the branch tube of the chemical liquid injection system, the desired purpose can be achieved with a very simple structure. Particularly suitable for use in a chemical injection system.

In the above-described embodiment, an example in which the one-way valve 250 with an opening function is connected to the syringe 200P filled with physiological saline is shown. However, the syringe 200C filled with the contrast medium may be connected to the one-way valve 250 with an opening function, and the syringe 200P filled with physiological saline may be connected to the normal one-way valve 240. In this case, whether or not the catheter is normally inserted into the blood vessel of the subject is confirmed by retracting the piston 220 of the syringe 200C filled with the contrast agent. Further, a one-way valve 250 with an opening function may be connected to both ends of the branch tube 230.

In general, the contrast agent is often sold in a state of being prefilled in a syringe. Syringes that are pre-filled and sold with contrast agents often have different shapes depending on the manufacturer. Therefore, in order to make the injection head adaptable to various syringes, the piston driving mechanism for operating the piston of the syringe filled with the contrast agent is not simply gripped at the end of the piston but simply pressed. There is something configured. In such an injection head, since the piston of the syringe filled with the contrast agent cannot be retracted, the syringe filled with physiological saline is connected to a one-way valve with an opening function, as in the above-described embodiment. Whether or not the catheter is normally inserted into the blood vessel of the subject is confirmed by retracting the piston of the syringe filled with physiological saline.

Moreover, although the example of the chemical | medical solution injection | pouring system which has an injection | pouring head which can mount | wear with two syringes was shown in the form mentioned above, the number of the syringes which can mount | wear with an injection | pouring head may be only one, 3 It may be the above. When an injection head with three or more syringes that can be attached is used, the branch tube has branches at the ends corresponding to the number of syringes that can be attached to the injection head. A one-way valve is connected, and a normal one-way valve is connected to the remaining end. When an injection head with only one syringe is used, the tube connected to the syringe is a normal tube whose end is not branched, and the end of the tube has the above opening function. One valve is connected.

In addition, when using an injection head with one syringe that can be attached and injecting only one type of chemical into a subject, the chemicals in other syringes may flow into the syringe even without one valve. Absent. However, even in such a case, by interposing the one-way valve with the opening function described above so as to allow the flow of the chemical solution from the syringe side only to the tube side, usually between the syringe and the tube, While the chemical solution is being injected, the piston is retracted due to some trouble and the blood of the subject is prevented from flowing into the syringe. Before the chemical solution is injected, the one valve is opened with the chemical solution container connected to the tip of the tube. And a chemical | medical solution can be attracted | sucked in a syringe from a chemical | medical solution container.

Further, in the above-described embodiment, the contrast medium and the physiological saline are exemplified as the chemical solution, but the present invention can be applied to a system for injecting various chemical solutions such as nutrients and antibiotics in addition to these liquids.

As for the chemical solution injection device, in the above-described embodiment, the chemical solution injection device that injects the chemical solution in the syringe by advancing the piston of the syringe filled with the chemical solution is shown. However, in the present invention, any chemical solution injection device can be used. It is. As an example of another type of chemical solution injection device, there is a tube pump type chemical solution injection device that conveys a chemical solution by sequentially crushing a built-in tube from the upstream side to the downstream side in the chemical solution conveyance direction.

When using a tube pump, the chemical solution is filled in a chemical solution container such as a bag and connected to the suction port of the tube pump by a connecting tube. On the other hand, the end of the tube for connection with the subject is connected to the outlet side of the one-way valve with an opening function described in detail, and the inlet side of the one valve is connected to the outlet of the tube pump. Alternatively, another tube may be connected between the one-way valve and the discharge port. In either case, the one-way valve with the opening function is indirectly connected to the chemical solution container via the tube pump on the inlet side. When the tube pump has a plurality of suction ports and discharge ports and is configured to be able to inject a plurality of types of chemical solutions, a branch tube is connected to the discharge port. Of course, at least one of the ends of the branch tube is connected to the above-described one-valve valve having an opening function, and a normal one-way valve is connected to the remaining ends.

In the embodiment described above, the one-way valve with an opening function according to the present invention is used for the purpose of controlling the flow direction of the chemical solution in the flow path between the chemical solution container side and the subject side. The one-way valve is arranged in an arbitrary flow path in the chemical liquid injection system where the flow and shut-off of the liquid can be switched, and the liquid flow in the flow path is limited to one direction or the liquid flow is shut off. It can also be used to

For example, in a chemical injection system, a blood pressure measuring device that measures the blood pressure of a subject by measuring the pressure in a tube connected to the blood vessel of the subject may be used. This blood pressure measuring device is connected to a tube connected to the subject via a blood pressure measuring tube, separately from the infusion line of the liquid medicine. The blood pressure of the subject acts on the blood pressure measuring device via the blood pressure measurement tube, and thereby the blood pressure of the subject can be measured.

However, if the blood pressure measurement device remains in communication with the tube connected to the subject, the injection pressure of the chemical solution injected at a relatively high pressure acts on the blood pressure measurement device during the injection of the chemical solution, and the blood pressure measurement device is destroyed. Therefore, it is necessary to block the flow of the chemical solution from the blood pressure measurement tube to the blood pressure measurement device during the injection of the chemical solution. Therefore, the one-way valve with an open function described above is between the tube connected to the subject and the blood pressure measurement tube, between the blood pressure measurement tube, or between the blood pressure measurement tube and the blood pressure measurement device, Usually, it is interposed so as to allow the flow of the drug solution from the blood pressure measuring device side only to the tube side connected to the subject. Accordingly, the blood pressure of the test subject can be measured by opening the one valve other than during the injection of the chemical solution while preventing the pressure of the chemical solution from acting on the blood pressure measuring device during the injection of the chemical solution.

Of course, the one-way valve with an opening function according to the present invention is not limited to a chemical liquid injection system, and in various devices and systems that involve the flow of liquid, the liquid is usually allowed to flow only in one direction, but the flow path is opened as necessary. Can be used for any purpose.

DESCRIPTION OF SYMBOLS 100 Chemical liquid injection device 110 Injection head 130 Piston drive mechanism 200C, 200P Syringe 210 Cylinder 220 Piston 230 Branch tube 240 One-way valve 250 (with open function) One-way valve 251 Casing 252 Casing body 253 Inflow pipe 254 Annular rib 255 Inlet 256 Outside Rib 258 Lid member 259 Outflow pipe 260 Valve body presser 261 Outlet 265 Open button 266 Action part 268 Coil spring 270 Valve body 300 Perspective imaging device 1000 Perspective imaging system

Claims

A casing constituting a valve chamber in which an inlet and an outlet of the liquid are opened;
Arranged in the valve chamber and opening the inlet when liquid flows into the valve chamber from the inlet side, but blocking the inlet by liquid flowing into the valve chamber from the outlet side; A flexible valve body;
An operation member that is movably attached to the casing and is manually operated, the operation member having an action part that deforms the valve body so as to contact the valve body and open the inlet by movement;
One-way valve with opening function.
The one-way valve with an opening function according to claim 1, wherein the valve body is formed in a disc shape, and the inflow port opens when the action portion deforms the valve body in a thickness direction thereof.
A central portion of the valve body is disposed so as to face the valve body in the valve chamber so that the valve body cannot substantially move in a liquid flow direction between the inlet and the outlet. A valve body presser,
The one-way valve with an opening function according to claim 2, wherein the action portion deforms an outer peripheral portion of the valve body by movement of the operation member.
The operation member is attached to be movable in the radial direction of the valve body,
The action portion is a rod-shaped portion that is formed integrally with the operation member so as to extend in the moving direction of the operation member, and enters the valve chamber through a through-hole formed in the casing. Item 5. A one-way valve with an opening function according to item 3.
The distal end portion of the action portion is formed in a wedge shape having an inclined surface that works to lift the outer peripheral portion of the valve body and open the inlet by operating the operation member. One-way valve with open function as described.
The operation member is a button in which the action portion is integrally formed, and is separated from the valve body by an urging member so that the action portion comes into contact with the valve body only when the button is pressed. The one-way valve with an opening function according to any one of claims 1 to 5, wherein the one-way valve is biased in a direction.
The one-way valve is compatible with a chemical solution injection system that injects a chemical solution filled in a chemical solution container through a tube,
An inlet pipe communicating with the inlet and an outlet pipe communicating with the outlet provided in the casing;
The one-way valve with an opening function according to any one of claims 1 to 6, wherein the inflow pipe is directly or indirectly connected to the chemical solution container, and the outflow pipe is connected to an end of the tube.
The one-way valve with an opening function according to claim 7, wherein the chemical container is a syringe and the inflow pipe is connected to a tip of the syringe.
A tube having a tip and an end;
One-way valve with an opening function according to any one of claims 1 to 6, which is connected to an end of the tube;
Having a tube unit.
The tube is a branched tube having a plurality of branched ends.
The one-way valve with an opening function is connected to at least one of the ends of the branch tube;
10. The tube unit according to claim 9, wherein a one-way valve that allows a flow of liquid from only the distal end side of the branch tube to only the distal end side is connected to the remaining end of the branch tube.
A chemical solution injection system for injecting a chemical solution in a chemical solution container through a tube,
A chemical solution injection device for injecting the chemical solution filled in the chemical solution container;
A tube having a tip and an end;
The one-way valve with an opening function according to any one of claims 1 to 6, wherein an outlet side is connected to an end of the tube, and an inlet side is directly or indirectly connected to the chemical liquid container.
Having a chemical injection system.
The chemical solution container is a syringe;
The liquid injector has an injection head equipped with a piston drive mechanism that is detachably mounted on the syringe and driven to operate a piston of the syringe,
The chemical injection system according to claim 11, wherein the one-way valve with an opening function is connected to the syringe on the inlet side.
The injection head includes a plurality of piston drive mechanisms that are detachably mounted on the plurality of syringes and that are independently driven to operate the pistons of the syringes.
The tube is a branched tube that is branched into a plurality of end sides in order to be connected to the syringes.
The one-way valve with an opening function is connected to at least one of the ends of the branch tube;
The chemical injection system according to claim 12, wherein a one-way valve that allows a liquid to flow only from a distal end side to a distal end side of the branch tube is connected to the remaining end of the branch tube.