JP3759735B2 - Medical check valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a medical device used for a medical instrument provided with a liquid path such as a female lock adapter or an infusion circuit in order to easily, safely and surely perform operations such as injection, mixed injection, and collection of liquids such as liquid medicine and blood. It relates to a check valve.
[0002]
[Prior art]
Conventionally, some medical instruments have a check valve. A check valve has a structure in which a valve is incorporated in a housing so that chemicals, blood, and the like do not flow backward, and it is difficult to downsize due to its structure, and many are expensive. And as a structure of the valve body, there are generally a rubber plug, a rubber button, a thing opened by the pressure of liquid, and the like.
[0003]
Examples of the medical check valve include those described in JP-A-10-118178 (Patent Document 1). This check valve has a valve body of a rubber button, and the valve body protrudes in the same direction as the depression on the front side surface toward the center and the concave portion recessed in a mortar shape toward the center. And an insertion hole is provided at the lowest point of the recess. This check valve can be easily guided to the insertion hole by sliding the insertion end of the medical device, and the insertion hole is inclined so that it can be easily opened in only one direction. The hole can be closed to prevent backflow.
[0004]
However, in the check valve, when the insertion end of a medical instrument such as a needle tube is inserted into the insertion end, the medical solution can freely flow in either direction with respect to the medical instrument. Therefore, for example, there has been a problem that a chemical solution or the like can be intentionally extracted and cannot function as a check valve.
[0005]
Further, in FIG. 2 of Utility Model Registration No. 3028435 (Patent Document 2), a ball-shaped valve body that slides in the axial direction of the support tube is fitted inside the cylindrical support tube, and the container An insertion port having a smaller diameter than the valve body sealed by the valve body is provided at the base end portion of the support pipe located on the side, and a discharge port having a diameter larger than that of the valve body is provided at the distal end portion of the support pipe located on the nozzle side There is disclosed a check valve provided with a locking claw piece for locking a valve body on the inner surface thereof. According to this check valve, when the jetted liquid flows backward, the reverse flow is blocked by the ball-shaped valve body portion.
[0006]
However, this check valve has a complicated structure because it has a structure in which a ball-shaped valve element is fitted into a support tube and sealed. Further, since the ball slides freely due to gravity, there is a problem that the ball is in a state where the insertion port is opened depending on the arrangement direction of the check valve.
[0007]
Furthermore, FIG. 3 of Utility Model Registration No. 3028435 (Patent Document 2) discloses a bottomed cylindrical air valve made of a flexible material having an elastic restoring force. This air valve has a slit-like opening formed on the side surface thereof, and this opening is configured to open when inhaling and to close when exhausting.
[0008]
However, when the valve according to this configuration is used as a check valve for a chemical solution, it is difficult for the liquid to easily enter from the slit-shaped opening and to sufficiently perform the function as the check valve.
[0009]
A female lock adapter having a check valve as shown in FIG. 9 is in circulation. This female lock adapter is used by being attached to a syringe, and has a configuration in which an elastic rubber 62 is inserted into a main body 61. The main body 61 has a drainage side communication hole 71 wider than a communication hole 64 provided in the upper part 63 on the syringe connection side, and an inclined surface 65 is formed therebetween. The elastic rubber 62 has an inclined wall 72 that comes into contact with the inclined surface 65, and the inclined wall 72 is held against the inclined surface 65 by the pressing portion 70 to prevent liquid flow.
[0010]
When the syringe is inserted into the communication hole 64 and the tip of the syringe presses the upper surface of the elastic rubber 62, the elastic rubber is deformed, so that the inclined wall 72 is separated from the inclined surface 65 and the spaces 65 and 67 communicate with each other. To flow. In this state, the liquid medicine can pass through the female lock adapter by operating the piston of the syringe.
[0011]
However, the check valve used in the female lock adapter 60 is connected to the syringe, and while the tip of the syringe presses the elastic rubber 62, the drug solution can freely flow in both directions. Therefore, when connected with a syringe, the function as a check valve cannot be achieved, and the user's needs may not be met.
[0012]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-118178
[Patent Document 2]
Utility Model Registration No. 3028435
[0013]
[Problems to be solved by the invention]
Therefore, the technical problem to be solved by the present invention is to solve the above-mentioned problem, and even when a medical instrument is connected with a safe, inexpensive and simple configuration, the flow of the liquid is reduced. It is to provide a medical check valve that can be limited to a direction only.
[0014]
[Means for Solving the Problems]
In order to solve the above technical problem, the present invention provides a medical check valve having the following configuration.
[0015]
  The medical check valve according to the first aspect of the present invention includes a hole communicating with a liquid path of a medical instrument, a first locking protrusion provided in the vicinity of the bottom wall side end of the outer peripheral wall, and the outer periphery. At least one opening provided in the wall and communicating with the holeAnd a groove extending along the outer peripheral surface to the bottom end side end part of the circumferential direction of the outer peripheral wall,
  It is made of an elastic material, and the bottomed cylinder is coaxially inserted into the communication hole, and has an outer cylinder that covers the opening in a stretched state.
  The first locking projection extends over the entire circumference of the bottom wall side end of the outer peripheral wall of the bottomed cylinder.Configured to extend and cut out with groovesConsists of flanges.
[0016]
According to the 2nd aspect of this invention, the said bottomed cylinder equips the said outer peripheral wall with the groove | channel extended to the bottom end side edge part in a part of the circumferential direction of an outer peripheral wall.
[0017]
According to the third aspect of the present invention, in the second aspect, the groove extends in parallel to the axis of the bottomed cylinder from a position on the bottom side of the opening.
[0018]
According to the fourth aspect of the present invention, the bottomed cylinder is tapered toward the bottom end side, and is configured to be tapered so that the outer diameter dimension at the narrowest portion is larger than the inner diameter dimension of the outer cylinder. Yes.
[0019]
According to the fifth aspect of the present invention, the first locking projection is constituted by a flange provided over the entire circumference at the bottom wall side end of the outer peripheral wall of the bottomed cylinder.
[0020]
According to the sixth aspect of the present invention, the first locking protrusion is provided so as to protrude from the outer cylinder surface.
[0021]
According to the seventh aspect of the present invention, the bottomed cylinder includes a second locking projection on the upper end of the outer peripheral wall, and the outer cylinder has a dimension between the first and second locking protrusions. Composed.
[0022]
According to the eighth aspect of the present invention, the outer cylinder is made of synthetic rubber.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the female lock adapter according to each embodiment of the medical instrument using the check valve of the present invention will be described with reference to the drawings.
[0024]
FIG. 1 is a perspective view showing an external configuration of a female lock adapter with a check valve according to a first embodiment of a medical instrument using the check valve of the present invention. FIG. 2A is a partial cross-sectional front view of the female lock adapter of FIG. FIG. 2B is a bottom view of the female lock adapter of FIG. 3 is a side sectional view of the female lock adapter of FIG.
[0025]
The female lock adapter 1 with a check valve is a medical instrument in which a tip of a syringe (see FIG. 4) is inserted into a hole 13 formed in a cylindrical main body 10 and connected thereto. In order to ensure fixation with the syringe, a flange joint is formed at the upper end of the main body, and a thread groove 12 that is screwed with the luer taper of the syringe is cut on the side surface of the collar 11 provided at the upper end. Yes.
[0026]
The hole 13 is configured to become thinner toward the back, and is more firmly attached to the tip of the inserted syringe tip, thereby preventing the liquid medicine in the syringe from leaking from the hole 13. The hole 13 forms a liquid feeding path 18 having a constant diameter in the middle of the hole 13.
[0027]
A check valve 2 for discharging the drug solution in the syringe only in one direction is integrally connected to the tip of the liquid feed path of the female lock adapter 1. The check valve 2 can cause the chemical liquid to flow only in the direction in which the chemical liquid pushed out from the syringe is discharged from the hole 13 of the female lock adapter 1 to the outside, and in the opposite direction, that is, from the outside of the female lock adapter. Block the flow of chemicals to
[0028]
The check valve 2 includes a bottomed cylinder 15 having a hole 20 having a diameter smaller than that of the liquid feeding path 18 and an outer cylinder 14 to which the bottomed cylinder 15 is inserted and fixed. The hole 20 is formed only up to the middle of the bottomed tube 15 in order to reduce the volume thereof. As a result, the bottomed tube 15 is configured such that the bottom wall is thicker than the side wall. By reducing the volume of the hole 20, the amount of the chemical solution can be reduced.
[0029]
Further, at both ends of the bottomed tube 15, protrusions 16 a and 16 b for preventing the displacement of the outer tube are provided. Each of the protrusions 16 a and 16 b is configured by a flange provided over the entire circumferential direction of the bottomed tube 15. The height of the protrusions 16a and 16b is preferably configured to be higher than the surface of the outer cylinder 14 as shown in FIG. With this configuration, the protrusions 16a and 16b protrude from the surface of the outer cylinder 14, and the outer cylinder 14 can be prevented from being displaced or dropped during use.
[0030]
The bottomed cylinder is provided with openings 21 communicating with the holes 20 at two opposing positions. The opening 21 is normally covered and closed by the outer cylinder 14 that functions as a valve.
[0031]
On the front end side of the opening 21 on the outer periphery of the bottomed tube 15, grooves 17 are provided at two locations so as to face each other. The groove 17 starts from the tip side of the protrusion 16 a and extends to the tip of the bottomed tube 15 in parallel to the axis of the bottomed tube 15.
[0032]
The outer cylinder 14 is a cylinder made of rubber, which is an elastic material, and is fixed by inserting a bottomed cylinder 15 into the communication hole. The inner diameter of the outer cylinder is configured to be smaller than the outer diameter of the bottomed cylinder 15, and when attached to the bottomed cylinder 15, the outer cylinder is in a tension state in the direction of tightening the bottomed cylinder 15, and is provided in the bottomed cylinder 15. Cover the aperture.
[0033]
The outer cylinder 14 is preferably made of synthetic rubber, particularly silicon rubber. Synthetic rubber can be configured not to include extraneous components such as proteins that affect the living body contained in natural rubber. Silicone rubber, in particular, has an effect on the living body when used as a medical device. Can be minimized.
[0034]
It is desirable that the length of the outer cylinder 14 be the same as the interval between the protrusions 16 a and 16 b provided at both ends of the bottomed cylinder 15. By configuring the outer cylinder in this way, it is possible to prevent the outer cylinder 14 from shifting in the axial direction with respect to the bottomed cylinder 15.
[0035]
As shown in FIG. 4, the female lock adapter of FIG. 1 is used by being connected to the syringe 3. That is, the tip 4 provided at the tip of the syringe body 3a is inserted into the hole of the female lock adapter 1 and fixed.
[0036]
As described above, the check valve 2 provided at the tip of the female lock adapter 1 is closed in the syringe 3 because the opening 21 is closed by the tension of the outer cylinder 14 in the state where it is only connected to the syringe. This chemical solution does not leak from the female lock adapter 1.
[0037]
When the piston 3b of the syringe 3 is pressed, the chemical solution in the syringe body 3a is fed into the hole 13 of the female lock adapter 1 from the tip 4 of the syringe. The fed chemical solution is fed into the check valve 2 as indicated by an arrow 50 and reaches the check valve hole 20. Since the opening 21 is closed by the outer cylinder 14 as described above, the chemical liquid does not leak out in this state.
[0038]
When the chemical solution is further fed, the pressure in the holes 13 and 20 is increased, and as shown by an arrow 51 in FIG. 5, a force is applied to expand the outer cylinder 14 through the opening 21, and the outer cylinder 14 expands. Deform. As a result, a gap 22 is formed between the outer cylinder 14 and the bottomed cylinder 15. When the gap 22 reaches the groove 17 provided on the outer periphery of the bottomed tube 15, the chemical solution flows out of the female lock adapter 1 through the groove 17 as indicated by arrows 52 and 53.
[0039]
When the force to push down the piston is released and the water pressure applied to the holes 13 and 20 of the female lock adapter 1 is reduced, the outer cylinder 14 returns to its original shape again due to its elastic force and closes the opening 21.
[0040]
On the other hand, when the piston is pulled up with the syringe 3 connected, the hydraulic pressure in the hole 13 of the female lock adapter 1 and the hole 20 of the check valve 2 becomes low, and the outer cylinder 14 firmly holds the opening 21. Since it closes, the backflow into the female lock adapter 1 can be prevented.
[0041]
In addition, when the female lock adapter 1 or the check valve 2 is immersed in the chemical solution and receives pressure from the outside, the outer cylinder 14 comes into close contact with the bottomed cylinder 15 and closes the opening 21. The chemical solution does not flow back into the adapter 1.
[0042]
Accordingly, since the female lock adapter 1 according to the present embodiment does not touch the outer cylinder 14 that is a valve body with the tip or needle tube of the syringe, a medical instrument such as the syringe 3 is connected with a simple configuration. Even if it is a case, a chemical | medical solution can be made to flow only to one direction, and the function as a non-return valve can always be exhibited. Accordingly, by connecting the female lock adapter to other medical instruments, various usage methods can be used depending on the purpose of use.
[0043]
Further, by adjusting the tension of the outer cylinder 14 in the state covered with the bottomed cylinder 15, the pressure for allowing the chemical solution to flow out can be adjusted, and various check valves can be created according to the purpose of use. Can do. Specifically, the tension of the outer cylinder 14 can be adjusted by changing the diameter of the outer cylinder or changing the material of the outer cylinder to a material having a different elastic coefficient.
[0044]
In addition, since the outer cylinder 14 is exposed when the female lock adapter is used, for example, when connecting to an infusion circuit or a blood transfusion circuit, the inserted tube has a small inner diameter or has a projection. May cause the outer cylinder 14 to shift or damage the outer cylinder. Moreover, when the inner diameter of the tube to be inserted is small, there is a risk that the expansion and deformation of the outer cylinder will be hindered and the outflow of the chemical solution may be hindered. These problems can be solved by attaching a cylindrical housing 5 as shown in FIG. 6 to the female lock adapter 1.
[0045]
The housing 5 is a cylindrical body into which the main body 10 of the female lock adapter 1 can be inserted, and the insertion position is fixed by a collar 19 provided on the main body 10. Moreover, the front-end | tip part 6 can accommodate the non-return valve provided in the female lock adapter 1, and has an internal diameter dimension which forms the clearance gap 30 between the surfaces of the non-return valve 2 at the time of accommodation.
[0046]
By attaching such a housing 5, the outer cylinder 14 of the check valve 2 is not exposed from the outer surface, and a shift during use does not occur. In addition, the housing | casing 5 does not need to be comprised as a separate member from the female lock adapter 1, and may be comprised integrally.
[0047]
FIG. 7 is a perspective view showing an external configuration of a female lock adapter according to a second embodiment of the medical instrument using the check valve of the present invention.
[0048]
Since the female lock adapter 1b according to the present embodiment generally has the same configuration as the female lock adapter according to the first embodiment, the description will focus on the differences.
[0049]
The main body 10 of the female lock adapter 1b has a configuration common to the main body of the female lock adapter 1 according to the first embodiment, and the configuration of the check valve 2b attached to the tip of the main body is different.
[0050]
The check valve 2b can flow the chemical liquid only in the direction in which the chemical liquid pushed out from the syringe is discharged to the outside of the female lock adapter 1, and in the reverse direction, that is, outside the female lock adapter. Prevents the flow of drug solution into the syringe.
[0051]
The check valve 2 includes a bottomed cylinder 15 a having a hole 20 having a diameter smaller than that of the liquid feeding path 18 and an outer cylinder 14 to which the bottomed cylinder 15 is inserted and fixed. The hole 20 is formed only up to the middle of the bottomed tube 15 in order to reduce the volume thereof. As a result, the bottomed tube 15 is configured such that the bottom wall is thicker than the side wall. By reducing the volume of the hole 20, the amount of the chemical solution can be reduced.
[0052]
The bottomed cylinder 15a is configured such that its outer diameter gradually decreases toward the tip. However, the dimension of the outer diameter B of the most basic portion of the bottomed cylinder 15a is configured to be the same as the outer diameter dimension of the bottomed cylinder 15 of the female lock adapter 1 according to the first embodiment, and the outer diameter of the distal end portion. The dimension A is preferably larger than the inner diameter dimension of the outer cylinder 14 used.
[0053]
At both ends of the bottomed tube 15a, protrusions 16a and 16b are provided for preventing the displacement of the outer tube. Each of the protrusions 16a and 16b is configured by a flange provided over the entire circumferential direction of the bottomed tube 15a. Moreover, the opening 21 connected to the hole 20 is provided in two places which the bottomed cylinder 15a opposes.
[0054]
The outer cylinder 14 is a cylinder made of rubber, which is an elastic material, and is fixed by inserting a bottomed cylinder 15a into the communication hole. As described above, the inner diameter of the outer cylinder is configured to be smaller than the outer diameter dimension A at the tip of the bottomed cylinder 15a. Then, it becomes a tension state in the tightening direction, and covers and closes the opening provided in the bottomed cylinder 15a.
[0055]
The outer cylinder 14 is preferably made of synthetic rubber, particularly silicon rubber. The length of the outer cylinder 14 is preferably the same as the interval between the protrusions 16 a and 16 b provided at both ends of the bottomed cylinder 15.
[0056]
Since the check valve attached to the female lock adapter 1b according to the present embodiment is configured so that the bottomed cylinder 15a is gradually narrowed toward the tip, the outer cylinder 14 covered by the check valve is subjected to its tension. It has an axial distribution. That is, since the outer cylinder 14 is disposed so that the tension becomes weaker in the distal direction, the distal end portion is more easily expanded and deformed by receiving the pressure of the chemical solution sent to the female lock adapter 1b by a syringe or the like. Therefore, the chemical solution flows out from the tip direction that is larger and easily expands, and the flow direction of the chemical solution can be easily controlled.
[0057]
FIG. 8 is a cross-sectional view showing a configuration of an infusion tube according to a third embodiment of a medical instrument using the check valve of the present invention.
[0058]
The infusion tube 1c according to the present embodiment has a configuration in which the check valve 2c according to the present invention is inserted into the infusion channels 40a and 40b of the tube 40.
[0059]
The check valve 2c can flow a liquid such as a drug solution or blood flowing through the infusion tube only in the direction in which the liquid flows from the opening side of the bottomed tube 15b to the bottom wall side of the bottomed tube 15b, and flows in the opposite direction. To prevent.
[0060]
The check valve 2 c includes a bottomed cylinder 15 a having a hole 20 and an outer cylinder 14 to which the bottomed cylinder 15 is inserted and fixed.
[0061]
Further, at both ends of the bottomed tube 15, protrusions 16 a and 16 b for preventing the displacement of the outer tube are provided. Each of the protrusions 16 a and 16 b is configured by a flange provided over the entire circumferential direction of the bottomed tube 15. The heights of the protrusions 16a and 16b are configured to be higher than the surface of the outer cylinder 14, and are substantially equal to the inner diameter of the tube. With this configuration, when the check valve 2c is incorporated in the tube, a gap 31 is formed between the wall of the tube and the surface of the outer cylinder 14.
[0062]
The bottomed cylinder is provided with openings 21 communicating with the holes 20 at two opposing positions. The opening 21 is normally covered and closed by the outer cylinder 14 that functions as a valve.
[0063]
On the front end side of the opening 21 on the outer periphery of the bottomed tube 15, grooves 17 are provided at two locations so as to face each other. The groove 17 starts from the tip side of the protrusion 16 a and extends to the tip of the bottomed tube 15 in parallel to the axis of the bottomed tube 15.
[0064]
The outer cylinder 14 is a cylinder made of rubber, which is an elastic material, and is fixed by inserting a bottomed cylinder 15 into the communication hole. The inner diameter of the outer cylinder is configured to be smaller than the outer diameter of the bottomed cylinder 15. The outer cylinder 14 is preferably made of synthetic rubber, particularly silicon rubber. The length of the outer cylinder 14 is preferably the same as the interval between the protrusions 16 a and 16 b provided at both ends of the bottomed cylinder 15.
[0065]
The infusion tube according to the present embodiment is suitably used in, for example, blood transfusion or infusion. That is, in blood transfusion or infusion, it is necessary to overcome blood pressure and administer blood or chemicals to the human body, so that the pressure on the upstream side 40a of the check valve of the infusion tube is increased. Then, due to these pressures, blood and chemical liquid reach the check valve 2c as shown by the arrow 54 by the same action as the check valve used in the previous embodiment described above, and shown by the arrow 55. So as to flow to the downstream side 40b.
[0066]
At this time, since the protrusions 16a and 16b are provided so as to protrude from the surface of the outer cylinder 14, the outer cylinder 14 can be deformed and expanded in the gap 31, and the flow of blood and chemicals is ensured.
[0067]
On the other hand, when the medicinal solution or blood infusion is completed, the pressure on the upstream side of the check valve 2c decreases, and conversely, blood flows back through the needle tube due to blood pressure. In this case, blood flows back by blood pressure until the position immediately downstream 40b of the check valve, but the check valve 2c prevents further backflow. Therefore, when the medicinal solution or blood infusion is completed, the backflow of blood can be reliably prevented, and the administration by blood transfusion or infusion can be performed safely.
[0068]
In addition, in FIG.8 (b), the modification of the infusion tube concerning this embodiment is shown. In this infusion tube, the check valve 2d having a structure in which the check valve of FIG. It is the structure inserted in the path | route 40a, 40b. The outer diameter dimension of the housing 5 a is configured to be approximately equal to the inner diameter dimension of the infusion tube 40.
[0069]
According to the infusion tube according to this modification, the casing 5a defines the gap 32 for the outer cylinder 14 to expand and deform. For example, even when the infusion tube is bent, blood or chemicals Can flow from the upstream side 40a to the downstream side 40b of the check valve.
[0070]
【The invention's effect】
As described above, according to the first aspect of the present invention, the opening provided in the outer peripheral surface of the bottomed cylinder is covered with the outer cylinder made of an elastic material. Prevents intrusion of chemicals. On the other hand, the hole in the bottomed cylinder is directly or indirectly connected to the medical device, and the liquid feeding path is communicated, so that the chemical solution flows from the medical device into the hole. Then, when a predetermined pressure is applied to the chemical liquid filled in the hole, the chemical liquid presses the outer cylinder through the opening, and a gap is formed between the bottomed cylinder and the outer cylinder. Leaks out of the water.
[0071]
Therefore, according to the above configuration, for example, in a check valve connected to a syringe or the like, the outer cylinder that functions as a valve is deformed only when a medical solution is fed from a medical instrument such as a syringe into a hole in the bottomed cylinder. In addition, the chemical solution can flow outside. Therefore, even if a medical instrument is connected with an inexpensive and simple configuration, the flow of the liquid can be limited to only one direction, and the flow of the chemical liquid in the reverse direction can be reliably prevented.
[0072]
According to the said 2nd aspect, by forming a groove | channel in the outer periphery of a bottomed cylinder, the chemical | medical solution extruded from the opening tends to flow to the outer side of a non-return valve through the said groove | channel, and the outflow direction of a chemical | medical solution is controlled. can do. Further, when the liquid pressure in the hole of the bottomed cylinder is low, the outer cylinder does not cause the chemical liquid to flow from the groove, and the problem of liquid leakage does not occur.
[0073]
According to the third aspect, since the groove does not reach the opening, when no pressure is applied to the chemical liquid in the hole of the bottomed cylinder, the chemical liquid can be prevented from leaking out. Can flow out through the groove at a distance.
[0074]
According to the fourth aspect, since the diameter of the tip of the bottomed cylinder is narrower, the tension of the outer cylinder that inserts the bottomed cylinder and covers it in a tensioned state gradually increases as it goes in the tip direction. Become. That is, the outer cylinder is easily expanded and deformed with a weaker pressure in the distal direction, and the chemical liquid is more likely to flow out from the distal end side of the check valve.
[0075]
According to the said 5th aspect, since the 1st latching protrusion is provided over the perimeter, the shift | offset | difference of the outer cylinder with respect to the perimeter direction can be prevented. In addition, since the outer cylinder does not constitute the tip of the check valve, it is possible to prevent the outer cylinder from slipping without contacting the outer cylinder, such as when the check valve of the present invention is inserted into the liquid supply path of the medical instrument. it can.
[0076]
According to the sixth aspect, since the first locking protrusion protrudes from the surface of the outer cylinder, the protrusion of the bottomed cylinder is located on the outer peripheral side of the distal end portion of the check valve, and the check according to the present invention. When the valve is inserted into the liquid delivery path of the medical instrument, the outer cylinder can be prevented from being displaced without contacting the outer cylinder.
[0077]
According to the said 7th aspect, the shift | offset | difference of the outer cylinder to the upper end direction of the outer peripheral wall which is the side connected with the liquid feeding path of a medical device can be prevented.
[0078]
According to the said 8th aspect, by comprising an outer cylinder with a synthetic rubber, it can comprise with the material which removed the component which influences a human body, such as the protein contained in a natural rubber, and uses it suitably for a medical device. be able to.
[0079]
In addition, this invention is not limited to the said embodiment, It can implement in another various aspect.
[0080]
For example, the type of medical instrument to which the check valve according to the present invention is attached is not particularly limited. For example, by incorporating the check valve according to the present invention into the hole of the tube, it is possible to obtain a tube that allows a chemical solution to flow only in one direction, and can be suitably used for an infusion circuit, a transfusion circuit, etc. . In particular, since back flow can be always prevented, it can be suitably used, for example, as a waste liquid inlet of a waste liquid container.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external configuration of a female lock adapter according to a first embodiment of a medical instrument using a check valve of the present invention.
FIG. 2 is a diagram showing a configuration of the female lock adapter of FIG. 1, and (a) is a partial cross-sectional front view. (B) is a bottom view.
3 is a side sectional view of the female lock adapter of FIG. 1. FIG.
FIG. 4 is a view showing a state in which a female lock adapter and a syringe are connected to each other.
5 is a view for explaining a state in which a chemical solution flows out from the female lock adapter of FIG. 1. FIG.
FIG. 6 is a view showing a modification of the female lock adapter of FIG.
FIG. 7 is a perspective view showing an external configuration of a female lock adapter according to a second embodiment of the medical instrument using the check valve of the present invention.
8A is a cross-sectional view showing a configuration of an infusion tube according to a third embodiment of a medical instrument using the check valve of the present invention, and FIG. 8B shows a modification of FIG. 8A. .
FIG. 9 is a partial cross-sectional view showing a configuration of a conventional female lock adapter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1b ... Female lock adapter, 1c, 1d ... Infusion tube, 2, 2b ... Check valve, 3 ... Syringe, 4 ... Piston, 5 ... Housing, 10 ... Main-body part, 13 ... Hole of female lock adapter, 14 ... outer cylinder, 15, 15a ... bottomed cylinder, 16a, 16b ... projection, 17 ... groove, 18 ... liquid feeding path, 19 ... brim, 20 ... hole of reverse support valve, 21 ... opening, 22 ... gap, 31, 32 ... Gap.

Claims (9)

A hole (20) communicating with the liquid path (18) of the medical device, a first locking projection (16a) provided near the bottom wall side end of the outer peripheral wall, and the hole provided in the outer peripheral wall A bottomed surface provided with at least one opening (21) communicating with (20), and a groove (17) extending along the outer peripheral surface to a bottom end side end part in a circumferential direction of the outer peripheral wall. A tube (15, 15a);
An outer cylinder (14) that is made of an elastic material and that coaxially inserts the bottomed cylinder (15, 15a) into the communication hole and covers the opening (21) in a stretched state;
The first locking protrusion (16a) is a flange configured to extend over the entire circumference of the bottom wall side end of the outer peripheral wall of the bottomed tube (15, 15a) and to be cut out by the groove. A check valve for medical use, comprising:   The medical check according to claim 1, wherein the groove (17) extends parallel to the axis of the bottomed tube (15) from a position on the bottom side of the opening (20). valve.   The medical check valve according to claim 1 or 2, wherein the first locking protrusion (16a) is provided so as to protrude from the outer cylinder surface (14a).   The bottomed cylinder (15a) is tapered toward the bottom end side, and is configured to be tapered so that the outer diameter (A) at the narrowest portion is larger than the inner diameter of the outer cylinder. The medical check valve according to any one of claims 1 to 3.   The bottomed cylinder (15, 15a) includes a second locking projection (16b) at the upper end of the outer peripheral wall, and the outer cylinder (14) is a dimension between the first and second locking protrusions. The medical check valve according to any one of claims 1 to 4, wherein the medical check valve is configured as follows.   The medical check valve according to any one of claims 1 to 5, wherein the outer cylinder (14) is made of synthetic rubber. A medical instrument using the medical check valve according to any one of claims 1 to 6 .   The medical instrument according to claim 7, further comprising a cylindrical housing into which the medical check valve can be inserted.   The medical instrument according to claim 7 or 8, wherein the medical instrument is a female lock adapter or an infusion tube.

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