JP4432326B2 - Indwelling catheter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in the connector portion of an indwelling catheter that is placed in an artery, vein, etc. and used for infusion, blood transfusion, artificial dialysis, etc., and more specifically, when the catheter is placed in an artery, vein, etc. Or it is related with the catheter which improved the connection operativity, preventing the blood leakage from the catheter until it connects an infusion line.
[0002]
[Prior art]
Conventionally, as such an indwelling catheter, a female connector is connected to a tube placed in an artery, vein or the like, a hemostasis valve is provided in the female connector, the hemostasis valve is mounted in the female connector, and a slit is formed. Some have a main body and a pusher that is slidably provided in the female connector and pushes the slit of the main body (see, for example, Patent Document 1).
[0003]
In the above, by inserting and connecting a male connector such as a syringe into the female connector and pressing the pusher, the pusher pushes and opens the slit of the main body, and the flow path is opened. Become.
[0004]
[Patent Document 1]
JP-A-2002-263197 [0005]
[Problems to be solved by the invention]
However, in the above-mentioned indwelling catheter, a dead space is formed between the hemostatic valve body and the pusher in the female connector. Therefore, when the male connector is connected to the female connector, an infusion or the like is present in the dead space. It goes in and out substantially. Therefore, when miscellaneous bacteria are mixed by mistake during the connection operation, the dead space becomes a hotbed of miscellaneous bacteria, which may cause an infection.
[0006]
In addition, since the hemostasis valve is composed of two parts, the structure is complicated, and the slit of the main body of the hemostasis valve is spread by a pusher, so that when the opening and closing of the hemostasis valve is repeated, the slit of the main body closes well. There was also a risk that the function of the hemostasis valve would be lost.
[0007]
The present invention simplifies the structure of the hemostasis valve, reduces the dead space in the female connector, reduces the possibility of causing an infection, and even if the connection operation is repeated, the function of the hemostasis valve is reduced. An object of the present invention is to provide an indwelling catheter that is less likely to be damaged.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the indwelling catheter of the present invention is characterized by A. A tube disposed in the front-rear direction; In an indwelling catheter having a female connector that is open at both front and rear ends and communicated with the rear part of the tube, (i) tapered forward in the front-rear direction intermediate portion of the inner peripheral surface of the female connector And (ii) the whole of the hemostasis valve that is elastically deformable is slidably accommodated in the front-rear direction, inside the taper part for opening of the female connector and the inside thereof. (iii) The hemostasis valve is (a) a hollow shape with both front and rear ends open, and a large diameter portion having an outer diameter larger than the inner diameter of the opening taper portion is formed on the outer surface, and the large diameter portion is for opening. By sliding forward on the inner surface of the taper portion, the main body is elastically deformed radially inward and is urged rearward by the elastic force at the time of the elastic deformation, and (b) the front end portion of the main body. , Integrally formed in a forward projecting shape, tapered With closing the front end opening of the body, by the elastic deformation in the radial direction inward of the body, in that it has a closing part which front end portion is opened radially outward.
In addition, A. A tube disposed in the front-rear direction; A female connector having a hollow opening at both front and rear ends, provided in communication with the rear portion of the tube, and having an inner needle hub detachably connected to the rear portion; In an indwelling catheter having an inner needle that is detachably inserted into a tube and a female connector, and whose front portion protrudes forward from the tube, (i) in the front-rear direction intermediate portion of the inner peripheral surface of the female connector. (Ii) a hemostasis valve that is elastically deformable inside the opening taper portion of the female connector and the rear thereof, and can be pushed forward by the male connector . whole is accommodated, (iii) the hemostasis valve, (a) front and rear ends is a hollow shape opening, the large diameter portion outside diameter than the inside diameter of the opening taper portion on the outer surface is large is formed, the inner When the needle hub is pressed, the large-diameter portion slides forward on the inner surface of the opening taper portion, so that it is elastically deformed radially inward and is urged backward by the elastic force at the time of this elastic deformation. The main body, and (b) the front end of the main body The front end of the main body is tapered, and the front end opening of the main body is closed, and the front end is radially outward by elastic deformation of the main body in the radial direction due to the insertion of the inner needle. It may have an opening / closing part that opens.
Also, the body of the hemostasis valve, by sliding the opening taper portion plane forward by pressing the male connector, while being elastically deformed radially inwardly, by the elastic force at the time of this elastic deformation, the rear The opening and closing portion may be biased and the front end portion may be opened radially outward due to elastic deformation of the main body radially inward by insertion of the male connector.
In addition, a connecting taper portion is formed on the inner peripheral surface of the female connector so as to be connected to the rear of the opening taper portion, and the inner needle hub or the male connector is releasably connected, and the taper ratio of the opening taper portion is May be larger than the taper ratio of the connecting taper portion.
In addition, the hemostasis valve may be duckbill shaped.
The hemostasis valve may be made of a rubber elastic material.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a trocar indwelling catheter will be described with reference to the drawings. FIG. 1 shows a catheter, which includes a tube (catheter tube, trocar) 1 and a female connector ( It has a catheter connector (outer needle hub) 2, a hemostasis valve 3, an inner needle (hollow needle) 4, an inner needle hub 5, a filter cap 6, a hydrophobic filter 7 and the like.
[0010]
As shown in FIGS. 2 to 9, the tube 1 is elongated (semi-) transparent, has flexibility, is integrally formed of a plastic (resin) material, and is disposed in the front-rear direction. As this plastic material, for example, a thermoplastic resin is used. The thermoplastic resin is preferably ethylene / tetrafluoroethylene copolymer (ETFE), tetrafluoroethylene / perfluoroalkyl ether copolymer (PFA), polypropylene resin, polyethylene resin, polyvinyl chloride resin, acrylonitrile. -Butadiene / styrene copolymer, polycarbonate resin, polyamide resin, polyoxymethylene resin and the like.
[0011]
The female connector 2 is connected to the inner portion of the rear portion thereof so that the inner needle hub 5 or the male connector can be releasably connected. The female connector 2 has a hollow cylindrical shape with both front and rear ends open, and is connected to the rear portion of the tube 1. It is externally fitted and fixed with an adhesive 8. On the inner peripheral surface of the female connector 2, a connecting taper part (first taper part) 9 located at the rear part, an opening taper part (second taper part) 10 located in the middle part in the front-rear direction, and a fixed part located at the front part The part 11 is connected continuously toward the front in the above order. 2, 5, and 8, L <b> 1 to L <b> 3 indicate the lengths of the tapered portions 9 and 10 and the fixing portion 11, respectively. Both tapered portions 9 and 10 are tapered toward the front, and the taper ratio (taper angle) of the opening taper portion 10 is larger than that of the connecting taper portion 9. A male connector such as an inner needle hub 5 or a syringe is releasably connected in the connecting taper portion 9, and the tube 1 is fixed to the fixing portion 11. The female connector 2 is integrally formed of a plastic (resin) material, and examples of the plastic material include the same material as the tube 1.
[0012]
The hemostasis valve 3 is provided so as to be slidable in the front-rear direction over the connecting taper portion 9 and the opening taper portion 10 in the female connector 2, and is elastically deformable. The hemostasis valve 3 is moved forward by the inner needle hub 5 or the male connector. It can be pressed. The hemostasis valve 3 has a tapered shape, for example, a duckbill (beak platypus beak) shape or a shape incorporating this, and the hemostasis valve 3 is formed by integrally forming a main body 13 and an opening / closing portion 14. The hemostasis valve 3 is formed of a rubber elastic material such as silicone, synthetic polyisoprene rubber, natural rubber, butyl rubber, chloroprene rubber, urethane rubber, styrene-butadiene rubber, ethylene propylene rubber, acrylic rubber, fluororubber, and thermoplastic elastomer. Yes. The hemostasis valve 3 may be provided with elasticity by a metal material such as spring steel and shape memory alloy disposed in the resin material, a combination of a rubber elastic material and a metal material, or the like.
[0013]
Body 13, with front and rear ends is a hollow shape opening, the front and rear part, are the large diameter portion 16 having an outer diameter greater than the inner diameter of the rear end of the opening taper portion 10, the main body 13 Is located in the connecting taper portion 9 and is in contact with the inner surface thereof. When pressed by the inner needle hub 5 or the male connector, the main body 13 slides forward in the opening taper portion 10 and elastically deforms inward in the radial direction. Be energized by. In the present invention, the opening taper portion 10 refers to a taper portion whose inner diameter at the rear end is smaller than the outer diameter of the main body 13.
[0014]
The opening / closing portion 14 is formed integrally with the front end portion of the main body 13 so as to project forward and is tapered. In this example, the opening / closing portion 14 is formed in a duckbill shape. The opening is closed so that it can be opened and closed. That is, in the front view of the opening / closing part 14, the slit 18 located in the longitudinal direction (radial direction) of the front end of the opening / closing part 14 and at the center in the width direction of the front end of the opening / closing part 14 The front end of the opening / closing part 14 can be opened and closed. The front end of the opening / closing part 14 is elastically deformed radially outward by the elastic deformation of the main body 13 radially inward by the insertion of the inner needle 4 and is opened.
[0015]
The inner needle 4 is inserted through the tube 1 and the female connector 2 so as to be detachable, and the front portion protrudes forward from the tube 1. The inner needle 4 is shaped like an elongated tube 1 (tube) and has flexibility. The front end is sharp. The inner needle 4 is integrally formed of, for example, stainless steel (SUS304 is preferable).
[0016]
The inner needle hub 5 has a hollow cylindrical shape that is open at both front and rear ends. The front portion of the inner needle hub 5 is externally fitted to the rear portion of the inner needle 4 and is fixed by an adhesive 19. It is removably inserted in the rear part. The inner needle hub 5 is integrally formed of a plastic (resin) material. As this plastic material, for example, the same material as the tube 1 can be mentioned.
[0017]
The filter cap 6 confirms flashback of blood and body fluid to the inner needle 4 and prevents leakage of blood and the like to the outside. The filter cap 6 has a hollow cylindrical shape with both front and rear ends opened. Is removably inserted into the rear portion of the inner needle hub 5. The cap 6 is integrally formed of a (semi) transparent plastic (resin) material. Examples of the plastic material include the same material as the tube 1.
[0018]
The filter 7 is mounted in the rear end portion of the filter cap 6.
[0019]
According to the above configuration example, when performing infusion or blood collection from a blood vessel such as a peripheral vein on the back of the patient's hand or the like, blood collection, etc., first, in the catheter, as shown in FIGS. The inner needle hub 5 is inserted into the female connector 2 from the rear, and by inserting the inner needle 4 , the opening / closing part 14 of the hemostasis valve 3 is pushed open and inserted into the tube 1, and hemostasis is performed by the inner needle hub 5. The valve 3 is pressed forward, the main body 13 of the hemostasis valve 3 is slid into the opening taper portion 10, and the main body 13 is elastically deformed radially inward. In this state, the main body 13 is urged rearward by its elasticity.
[0020]
Next, the inner needle 4 and the tube 1 are punctured into a patient's blood vessel or the like. At this time, blood or body fluid in the patient's blood vessel flashes back and flows out from the inner needle 4 into the inner needle hub 5. To do. Since this outflow can be visually recognized through the inner needle hub 5, it can be easily confirmed whether or not the puncture has been successfully performed.
[0021]
Further, at the time of puncturing, since the rear end opening of the inner needle hub 5 is closed by the filter cap 6 and the filter 7, there is no possibility that germs or the like enter from the rear end opening of the inner needle hub 5.
[0022]
As described above, after the inner needle 4 and the tube 1 are punctured into the blood vessel or the like of the patient, the female connector 2 or the like is fixed to the back of the patient's hand with tape or the like.
[0023]
Next, the inner needle 4 and the inner needle hub 5 are removed from the tube 1 and the female connector 2 and the like. By this removal, the pressure of the hemostasis valve 3 by the inner needle hub 5 is released. The main body 13 slides backward due to its elastic force and returns into the connecting taper portion 9 and is deformed radially outward to return to its original size, whereby the hemostasis valve 3 is restored. The opening / closing part 14 is closed. This can prevent blood leakage and the like when the inner needle 4 is removed.
[0024]
Thereafter, when infusion or blood collection is started, as shown in FIGS. 7 to 9, for example, a tip 21 of a syringe 20 exemplified as a male connector is inserted into the female connector 2, and the tip 21 is inserted into the female connector. The connecting taper portion 9 of the connector 2 is releasably tapered and connected, and the hemostasis valve 3 is pressed forward. As a result, similarly to the above, the main body 13 of the hemostasis valve 3 slides into the opening taper portion 10, the main body 13 is elastically deformed radially inward, and the opening / closing portion 14 of the hemostasis valve 3 is opened. Then, infusion, blood collection, and the like are started with the syringe 20.
[0025]
When the infusion or blood collection is completed, the syringe 20 is removed from the female connector 2. By this removal, the pressure of the hemostasis valve 3 by the syringe 20 is released. However, by its elastic force, it slides backward and returns into the connecting taper portion 9 and is deformed radially outward to return to its original size, thereby opening and closing the hemostasis valve 3. Part 14 is closed. This can prevent blood leakage and the like when the syringe is removed.
[0026]
In the above configuration example, since the hemostasis valve 3 is composed of a single member, the dead space formed between the female connector 2 and the hemostasis valve 3 can be reduced. Thus, since the dead space serving as a hotbed for various germs can be reduced, the possibility of causing infections can be reduced.
[0027]
Further, since the hemostasis valve 3 is composed of a single member, the structure is simple, and when the female connector 2 and the male connector are connected, the opening / closing portion 14 of the hemostasis valve 3 is expanded by the male connector or the like to be opened. Instead, the opening / closing part 14 is opened by sliding the hemostasis valve 3 with the male connector. Therefore, even if the connection between the female connector 2 and the male connector is repeated, the function of the opening / closing part 14, i.e. There is little possibility that the function will be damaged.
[0028]
In the above embodiment, the taper ratio of the connecting taper portion and the opening taper portion are different from each other, but they may be the same.
[0029]
【The invention's effect】
As described above in detail, according to the present invention, since the hemostasis valve is constituted by a single member, the dead space formed between the female connector and the hemostasis valve can be reduced. Thus, since the dead space serving as a hotbed for various germs can be reduced, the possibility of causing infections can be reduced.
In addition, since the hemostasis valve is composed of a single member, the structure is simple, and when the female connector and the male connector are connected, the opening and closing part of the hemostasis valve is expanded by the male connector, etc. Since the opening / closing part is opened by sliding the hemostasis valve with the male connector, even if the connection between the female connector and the male connector is repeated, the function of the opening / closing part, that is, the function of the hemostasis valve is less likely to be impaired.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
3 is a cross-sectional view taken along line AA in FIG.
4 is an exploded perspective view of FIG. 1. FIG.
FIG. 5 is an enlarged view of a main part of FIG.
6 is a cross-sectional view taken along line BB in FIG.
7 is a cross-sectional view showing a state in which the inner needle or the like in FIG. 1 is replaced with a syringe.
8 is an enlarged view of a main part of FIG.
9 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tube 2 Female connector 3 Hemostatic valve 4 Inner needle 5 Inner needle hub 9 Taper part for connection 10 Taper part for opening 13 Main body 14 Opening / closing part 20 Syringe
21 chip (male connector)

Claims (6)

A. Tubes arranged in the front-rear direction;
B. In the indwelling catheter having a female connector provided in communication with the rear part of the tube, the front and rear both ends being hollow,
(I) An opening taper portion tapered toward the front is formed in the front-rear direction intermediate portion of the inner peripheral surface of the female connector;
(Ii) The entire hemostatic valve , which is elastically deformable, is accommodated in the taper portion for opening the female connector and the interior extending behind the taper portion so as to be slidable in the front-rear direction.
(iii) the hemostasis valve
(A) A hollow shape having both front and rear ends open, a large diameter portion having an outer diameter larger than the inner diameter of the opening taper portion is formed on the outer surface, and the large diameter portion slides forward on the inner surface of the opening taper portion. The main body that is elastically deformed radially inward by being moved, and is urged rearward by the elastic force at the time of this elastic deformation,
(B) The front end of the main body is integrally formed in a forward projecting shape, is tapered, closes the front end opening of the main body, and is elastically deformed radially inward of the main body so that the front end is radially outward. An indwelling catheter having an opening / closing portion that opens to the side. A. Tubes arranged in the front-rear direction;
B. A female connector in which the front and rear ends are hollow and are provided in communication with the rear part of the tube, and the inner needle hub is detachably connected to the rear part,
C. In the indwelling catheter having an inner needle that is inserted through the tube and the female connector so as to be detachable and the front part protrudes forward from the tube.
(I) An opening taper portion tapered toward the front is formed in the front-rear direction intermediate portion of the inner peripheral surface of the female connector;
(Ii) The entire hemostatic valve which is elastically deformable and can be pushed forward by the male connector is accommodated in the taper portion for opening the female connector and the interior extending behind the tapered portion.
(Iii) The hemostasis valve
(A) A hollow shape with both front and rear ends open, a large diameter portion having an outer diameter larger than the inner diameter of the opening taper portion is formed on the outer surface, and the large diameter portion is an opening taper by pressing of the inner needle hub. By sliding forward on the inner surface of the part, the main body is elastically deformed radially inward, and is urged rearward by the elastic force at the time of the elastic deformation,
(B) The front end of the main body is integrally formed in a forward projecting shape, is tapered, closes the front end opening of the main body, and is elastically deformed radially inward by insertion of the inner needle. The indwelling catheter which has an opening-and-closing part which a part opens to radial direction outward. Body of the hemostasis valve, by sliding the opening taper portion plane forward by pressing the male connector, while being elastically deformed radially inwardly, by the elastic force at the time of this elastic deformation, urged rearward The indwelling catheter according to claim 1, wherein the opening / closing portion is opened radially outwardly by elastic deformation of the main body radially inward by insertion of the male connector. On the inner peripheral surface of the female connector, there is formed a connecting taper part connected to the rear of the opening taper part and releasably connected to the inner needle hub or male connector, and the taper ratio of the opening taper part is connected. The catheter for indwelling in any one of Claims 1-3 made larger than the taper ratio of the taper part for use. The indwelling catheter according to any one of claims 1 to 4 , wherein the hemostasis valve has a duckbill shape. The indwelling catheter according to any one of claims 1 to 5 , wherein the hemostasis valve is made of a rubber elastic material.

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