JP4464151B2 - Blood collection needle - Google Patents

Description

The present invention relates to a blood collection needle, and more particularly, the present invention relates to a blood collection needle that can be used safely without blood backflow at the time of blood collection and, therefore, medicine in the blood collection tube does not flow back with blood. Is.

In recent years, health examinations have been carried out on a daily basis, and blood tests have been one of the indispensable tests in recent years. . A blood test is generally performed according to a blood collection manual (see Non-Patent Document 1). As shown in FIG. 4, the blood collection needle used for this blood test is provided with a hub 13 on a part of one needle 10 and a protective cover 16 on the blood collection side of the needle 10. ing. The blood collection tube 80 has a medicine 19 inside, and a rubber lid 81 is attached to the opening. Recently, in this blood test, when blood is collected using a conventional blood collection needle, if the blood collection procedure is incorrect, the collected blood will be backflowed, causing adverse effects on the human body (eg, bacterial contamination). (Group of Fujita Health University Junior College, Ichiro Katsuta Associate Professor). In response to this report, a notice from the Ministry of Health, Labor and Welfare was notified. Regarding this content , when an item related to the backflow of blood is picked up , “In the fourth item, it is confirmed that the patient's arm or other puncture site is facing downward. This is to prevent backflow. As soon as blood begins to flow, the tourniquet should be removed and the blood collection tube must not be repositioned until it is removed from the syringe needle, while the contents of the blood collection tube touch the cap. If blood moves back and forth in the blood collection tube, it may flow back into the vein and cause adverse reactions to the patient . " (See Non-Patent Document 2).
Blood collection manual using vacuum blood collection tubes (Tokyo Health Bureau Medical Safety Division, 2003.12.22) Yakushoku Yasushi 1117001 NCCLS guidelines (standard blood sampling method by venipuncture)

However, in the blood test as described above, when a conventional blood collection needle as shown in FIG. 4 is used, it is known that blood flows backward during blood collection. Considering the fact that blood has not been thought to flow backward during blood collection in the past, although there is a manual on blood collection as described in Non-Patent Document 1, it is not always followed. Moreover, the blood collection manual described in Non-Patent Document 1 as described above has many items to be collected and is very troublesome, and the blood collection efficiency and work efficiency are poor. In addition, the NCCLS guideline described in Non-Patent Document 2 has a problem that the number of items for preventing backflow is increased and the blood collection efficiency and the work efficiency are poor. Accordingly, the present inventor has studied various problems of blood backflow during blood collection with a conventional blood collection needle, found that the problem can be solved by employing a check valve, and has made the present invention here.

  Therefore, the problem to be solved by the present invention is to provide a blood collection needle that is safe and has high work efficiency while preventing blood backflow during blood collection.

(1) The needle for blood collection tube fitted with a hub having a hub and blood collection needle having a venous needle, the upstream side of the check valve to rebound elasticity to the fitting portion formed of an elastic member is 30% to 80% And a circular check valve having an annular airtight projection on the downstream side and a through hole in the center, the through hole being formed with a rectangular slit on the downstream side and on the upstream side A blood collection comprising a check valve formed into a square and inclined from the upstream end of the rectangular slit toward the upstream side, and the check valve is housed under compression Tube needle.
(2) In the first aspect of the present invention , a check valve is built in the hub having the venous needle in the blood collection needle in which the hub having the blood collecting needle is fitted to the hub having the venous needle. needle for the blood collection tube.
(3) In the blood collection needle obtained by fitting a hub having a venous needle to a hub having a blood collection needle, a check valve is built in the hub having the blood collection needle . Blood collection needle.

According to the present invention, the needle blood collection tube fitted with a hub having a hub and blood collection needle having a venous needle, a check valve which impact resilience modulus to the fitting portion formed of an elastic member is 30% to 80% A circular check valve having an annular airtight projection on each of the upstream side surface and the downstream side surface and having a through hole in the central portion, the through hole having a rectangular slit formed on the downstream side surface, By incorporating a check valve that is square on the side surface and that is inclined from the upstream end of the rectangular slit toward the upstream side surface, and that the check valve is housed under compression , Blood from the side of the square opening flows but does not flow at all in the opposite direction. As a result, by using such a check valve needle blood collection tube, excellent the effect, namely, it is possible to obtain a good blood collection tube needle of work efficiency while effectively prevented backflow of blood upon blood collection This is an extremely excellent effect. Further, in the blood collection needle, when the rebound resilience of the elastic member is 30 to 80%, it is possible to prevent a back flow of blood during blood collection and to obtain a blood collection needle with high work efficiency. It has an excellent effect. Furthermore, in the blood collection needle, the check valve can be housed under compression, so that it is possible to obtain a highly efficient blood collection needle that can prevent the backflow of blood during blood collection and obtain a work efficiency. It is what you play. In particular, the blood collection needle according to the second aspect of the present invention is a blood collection needle in which a hub having a blood collection needle is fitted to a hub having a vein needle, and a check valve is provided in the hub having the vein needle. By incorporating it, it is possible to completely prevent backflow of blood during blood collection and to obtain a very excellent effect that a blood collection needle with high work efficiency can be obtained. In the blood collection needle according to item 3 of the present invention, a check valve is incorporated in the hub having the blood collection needle in the blood collection needle in which the hub having the vein needle is fitted to the hub having the blood collection needle. Thus, the same excellent effect as the effect of the second item is achieved.

Hereinafter, the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to the specific examples described below. FIG. 1 is a view showing a check valve used in the present invention. 1a is a plan view of the check valve, and FIG. 1b is a cross-sectional view of the check valve. In FIG. 1, since the check valve I is housed in an annular housing, the surfaces on the opening 23 side and the slit 3 side of the check valve body 1 made of a circular elastic body are concentric with respect to the center. Airtight annular projections 41 and 42 are formed in a circular shape. In addition, a through hole 3 is formed at the center, and a rectangular slit is formed on the surface of the through hole 3 on the downstream side (or the slit side), but this shape may be a ship's shape. Further, the surface on the upstream side (opening side) has a rectangular, for example, square opening 23 , and has an inclined portion 2 that is inclined from the surface toward the slit or the through hole 3 (see FIG. 1). b). The inclined portions 21 and 22 reach the side in the longitudinal direction of the slit. Accordingly, in the cross-sectional view of FIG. 1b, the inclined portions 21 and 22 form a taper from the upstream side toward the downstream side. The operation of the check valve 1 according to the present invention is that when blood flows from the upstream side, if the fluid pressure increases, the slit 3 is distorted downstream to open a hole in the slit 3 and blood flows. On the other hand, when blood tries to flow from the downstream side, the slit 3 is distorted upstream. However, since this distortion presses the inclined portion when the check valve 1 is installed (see the fixing member 15 in FIG. 2), the slit 3 does not open. The elastic body used in the present invention preferably has a rebound resilience in the range of 30 to 80%. The range of the rebound resilience used is individually determined by the rebound resilience and the degree of compression when the compression arrangement is performed. Examples of a preferable material for the elastic body include synthetic resins, and particularly preferable are synthetic rubbers such as silicone rubber, nitrile rubber, fluorosilicone rubber, hydrin rubber, fluorine rubber, and ethylene propylene rubber, and silicone, isopropylene, polyurethane, and acrylonitrile- A synthetic resin such as a butadiene-based copolymer or a fluororesin. Among these, silicone rubber, fluorosilicone rubber, silicone, fluorine rubber, ethylene propylene rubber, and isopropylene are particularly preferable.

FIG. 2 is a cross-sectional view showing the blood collection needle of the present invention. In FIG. 2, the vein needle 11 is attached to the hub 13. At this time, the hub 13 is preferably formed integrally with the venous needle, but the needle fixing member 15 may be provided and fixed. A check valve is installed inside the hub 13. On the other hand, the blood collection needle 12 is attached to a hub 14 having a threaded portion or an annular projection 17 on the outer periphery. The hub 14 is fitted to the hub 13 having the vein needle 11. The fitting portion E of the hub 13 has an outer peripheral wall 14a, and has a space 18 inside thereof. When the check valve is installed in the hub 13, the slit 3 (see FIG. 1) can be distorted with respect to the hydraulic pressure because of the space 18. With this outer peripheral wall 14a, the check valve 1 built in the hub 13 is fitted and pressed and fixed. The end surface of the needle fixing member 15 mounted on the opposite vein needle side, that is, the surface in contact with the check valve 1 has a shape corresponding to the opening surface of the check valve 1. Thus, the surface of the check valve 1 on the venous needle side is pressed and fixed. This pressing and fixing does not cause distortion with respect to the backflow pressure. Further, the blood collection needle 12 is usually provided with a protective cover 16 to protect the needle. Thus, in the present invention, the hub 13 having the venous needle 11 and the hub 14 having the blood collection needle 12 are fitted, and a specific check valve (see FIG. 1) is provided on the hub 13 of the fitting portion. As a result, the backflow of blood at the time of blood collection can be completely prevented, and the work can be performed with confidence, so that the work efficiency is improved. In the present invention, the venous needle 11 is fitted to the hub 13 having the blood collection needle 12 and the hub 14 having the blood collection needle 12 when the venous needle 11 is fitted to the hub 13 by inserting the hub 14 having the blood collection needle 12. However, it goes without saying that the hub 13 of the venous needle 11 may be inserted and fitted into the hub 14 having the blood collection needle 12. The fitting part E can use conventionally known means such as plugging and screwing.

In general, as a check valve , typical ones relating to a blood collection needle to which a duckbill type, a combination of a ball and a rubber plate, an umbrella type and a foot valve type are applied can be listed. FIG. 3 is a cross-sectional view showing various check valve configurations. FIG. 3a is a cross-sectional view showing a duckbill check valve. A hub 14 having a blood collection needle 12 is fitted to a hub 13 having a vein needle 11, and the blood collection needle 12 is covered with a protective cover 16. A duckbill check valve 20 is installed inside the fitting portion E. The duckbill check valve 20 allows blood flowing in from the venous needle side to pass but does not flow in the reverse direction. FIG. 3b is a cross-sectional view showing a combined check valve of a ball and a rubber plate. A hub 14 having a blood collection needle 12 is fitted to a hub 13 having a vein needle 11, and the blood collection needle 12 is covered with a protective cover 16. Inside the fitting portion E, a ball 30 and rubber plates 31 and 32 are provided in parallel as a combined check valve of a ball and a rubber plate. The rubber plate 33b has one large hole, and the rubber plate 32 is provided with one small through hole 32a. The combined check valve of the ball and the rubber plate allows blood flowing in from the venous needle side to pass, but in the opposite direction, the ball 30 is in close contact with the hub 13 or the fixing member 15, and the hub 13 or Since the hole of the fixing member 15 is blocked, it cannot be circulated. FIG. 3c is a cross-sectional view showing a combined check valve of a ball and a rubber plate. A hub 14 having a blood collection needle 12 is fitted to a hub 13 having a vein needle 11, and the blood collection needle 12 is covered with a protective cover 16. Inside the fitting portion E, a ball 30 and a rubber plate 33 are provided in parallel as a combined check valve of a ball and a rubber plate. The rubber plate 33 has a plurality of holes 33a. In the combined check valve of the ball and the rubber plate, blood flowing in from the venous needle side passes, but does not flow in the reverse direction. FIG. 3 d is a cross-sectional view showing an umbrella type check valve. A hub 14 having a blood collection needle 12 is fitted to a hub 13 having a vein needle 11, and the blood collection needle 12 is covered with a protective cover 16. An umbrella type check valve 40 is installed inside the fitting portion E. In the umbrella-type check valve 40, blood flowing in from the venous needle side passes but does not flow in the reverse direction. FIG. 3e is a sectional view showing a foot valve type check valve. A hub 14 having a blood collection needle 12 is fitted to a hub 13 having a vein needle 11, and the blood collection needle 12 is covered with a protective cover 16. A foot valve type check valve 50 is installed inside the fitting portion E. Since one end of the foot valve type check valve 50 is not fixed, the blood flowing in from the venous needle side flows in from there but does not flow in this reverse direction. In addition, as a check valve, the structure and operation of a check valve of a duckbill type, a combination type of a ball and a rubber plate, an umbrella type and a foot valve type have been conventionally known. In the present invention, the venous needle 11 is fitted to the hub 13 having the blood collection needle 12 and the hub 14 having the blood collection needle 12 as described above. Although the case where it fits was demonstrated, it cannot be overemphasized that the needle | hook 11 for veins may be inserted in the hub 14 which has the blood collection needle | hook 12, and the hub 13 may be fitted. The fitting part E can use conventionally known means such as plugging and screwing.

It is sectional drawing which shows the non-return valve used by this invention. a is a plan view of the check valve, and b is a cross-sectional view thereof. It is sectional drawing which shows the needle for blood-collecting tubes of this invention. It is sectional drawing which shows the needle for blood-collecting blood vessels using the other check valve. It is sectional drawing which shows the conventional needle for blood-collecting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Check valve main body 1a Cover body upstream surface 1b Storage body downstream surface 2 Inclined part 21, 22 Inclined part of opening
23 square (square)
3 Slits 41, 42 Airtight annular protrusion 10 Single needle 11 Vein needle 12 Blood collection needles 13, 14 Hub 14 a Outer periphery 15 Fixing member 16 Protective cover 17 Screw part 18 Space 19 Medicine 20 Duckbill type check valve 30 Balls 31, 32 , 33 Rubber or plastic plate 32a Small-diameter hole 33a Hole or through-hole 33b Large-diameter hole 40 Umbrella type check valve 50 Foot valve type check valve 80 Blood collection tube E Fitting part

Claims (3)

The needle blood collection tube fitted with a hub having a blood collection needle hub having an IV needle, an upstream side and a downstream side of the check valve to rebound elasticity to the fitting portion formed of an elastic member is 30% to 80% Are circular check valves that each have an annular airtight projection and a through hole in the center, the through hole being formed with a rectangular slit on the downstream side and a square on the upstream side. And a check valve that is inclined toward the upstream side surface from the longitudinal end portion of the rectangular slit, and the check valve is housed under compression . The blood collection needle according to claim 1 , wherein a check valve is built in the hub having the venous needle in the blood collection needle having the hub having the blood collection needle fitted to the hub having the venous needle. . 2. The blood collection needle according to claim 1 , wherein a check valve is built in the hub having the blood collection needle in the blood collection needle in which the hub having the vein needle is fitted to the hub having the blood collection needle.

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