JP2005319023A - Blood sampling needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle for vacuum blood sampling which can not only effectively prevent the collected blood from flowing backward into a blood vessel of the blood sample provider, but also help conduct the blood sampling works efficiently and conveniently. <P>SOLUTION: This blood sampling needle comprises a blood sampling needle body 2, a communication needle 3, a blood sampling needle body fixing member 4 with one end fixing the blood sampling needle body 2 and the other end having an opening 4b, and a communication needle fixing member 5 with one end fixing the communication needle and the other end having an opening 5b, and a communication member 6 forming a hollow flow passage 6a which links the blood sampling needle fixing member 4 and the communication needle fixing member 5 and is to be compressed in the length direction of the hollow flow passage 6a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a blood collection needle used in a vacuum blood collection system that collects blood using an internal reduced pressure, and more particularly to a blood collection needle provided with a structure that prevents backflow during vacuum blood collection.

  Conventionally, various vacuum blood collection methods have been proposed in which blood collection is performed using the reduced pressure in the vacuum blood collection tube. In such a vacuum blood collection method, a tourniquet is generally used to increase the pressure in the blood vessel of the blood sample. A blood collection needle fixed to the holder is inserted into the blood collection subject's blood vessel while the pressure in the blood collection subject's blood vessel is increased by the tourniquet. At the same time as inserting the blood collection needle into the blood vessel, the vacuum blood collection tube is inserted through the opening of the holder, and the needle part on the vacuum blood collection tube side of the blood collection needle is pierced through the stopper attached to the opening of the vacuum blood collection tube. And the blood collection needle are in communication. The stopper is usually made of a material that can be pierced by a blood collection needle, such as rubber or elastomer. Since the inside of the vacuum blood collection tube is depressurized, blood is guided from the blood vessel of the blood sample to the blood collection needle and collected in the vacuum blood collection tube.

  By the way, normally, in a vacuum blood collection tube for a coagulation function test or a blood sedimentation test, a blood anticoagulant such as heparin or a citrate aqueous solution is stored in the vacuum blood collection tube in order to prevent coagulation of the collected blood. Yes. In a vacuum blood collection tube for biochemical examination, silica-based minerals such as silica, kaolin, and diatomaceous earth are stored in the vacuum blood collection tube as a blood coagulation promoter in order to promote blood coagulation. Furthermore, in some cases, a test reagent may be stored in a vacuum blood collection tube in order to immediately obtain a test result of the collected blood. The storage amount of these blood treatment chemicals is finely managed according to the amount of blood to be collected so that the concentration is determined.

  In blood collection using a vacuum blood collection method, blood collection is performed automatically using a pressure difference, so the blood sampler focuses only on whether the needle tip is positioned correctly in the blood vessel of the blood sample. Just do it. In addition, mixing with blood treatment agents such as the above-mentioned blood anticoagulants and blood coagulation promoters is only a mixing operation with the blood treatment agents stored in advance, and the blood treatment agents were weighed and collected by themselves. It is useful for simplifying and standardizing blood collection work without the need for injection into blood.

  However, if the blood collection operation is inappropriate, the blood collected in the vacuum blood collection tube may flow back into the blood collection vessel. When the reverse flow phenomenon occurs, the above-mentioned blood treatment chemical in the vacuum blood collection tube moves into the blood vessel of the blood collection subject. As these blood treatment agents, those having the action of fixing blood cells in a non-physiological state are used, and it is not preferable that the blood treatment agents are transferred into the living body.

  Therefore, various vacuum blood collection methods using a blood collection needle provided with a structure for preventing the backflow of blood inside the blood collection needle have been proposed.

  For example, Patent Document 1 below discloses a blood collection needle in which a chamber is formed. The blood guided from the blood vessel of the blood sample is once stored in the chamber. Blood stored in the chamber is guided into the vacuum blood collection tube. When a backflow phenomenon occurs, blood stored in the chamber first flows back into the blood vessel of the blood sample. Therefore, the blood collected in the vacuum blood collection tube and mixed with the blood treatment agent can be delayed from flowing back into the blood vessel.

Patent Document 2 below discloses a blood collection needle equipped with a device having a mechanism for adjusting the blood collection volume. A blood flow control device having a hollow channel made of an elastic material is provided in a part of the channel of the blood collection needle. When the blood flow control device is pressed with a finger or the like, the pressed portion is easily blocked and the blood flow is blocked.
JP-A-57-11660 JP 56-109643 A

  As described above, the structures described in Patent Document 1 and Patent Document 2 prevent blood collected in a vacuum blood collection tube and mixed with a blood treatment drug from flowing back into the blood vessel of the blood sampled subject. However, it is supposed to be possible.

  However, the structure described in Patent Document 1 only delays the backflow of blood mixed with the blood treatment drug into the body of the blood sample, and does not include a mechanism for preventing the backflow phenomenon itself. Therefore, it has not been possible to completely prevent blood mixed with the blood treatment drug from flowing back into the blood vessel of the blood sample.

  The structure described in Patent Document 2 is effective when it is difficult to continue blood collection due to collapse of blood vessels during blood collection. On the other hand, when it is desired to completely block the blood flow, the blood flow control device must always be held by a finger. When exchanging the vacuum blood collection tube or removing the blood drive body, it was difficult and very inconvenient to perform the work alone.

  Furthermore, when a reverse flow phenomenon occurs, the blood flow control device is pressed by a finger to block the flow path, but if the finger is accidentally released from the blood flow control device, blood mixed with a blood treatment agent However, it was certain that the blood flowed back into the blood vessel of the blood sample, and it was not possible to prevent it completely. The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and not only effectively prevent the collected blood from flowing back into the blood vessel of the blood sample during vacuum blood collection, but also to perform blood collection work. An object of the present invention is to provide a blood collection needle that can be efficiently and conveniently performed.

  The invention of the present application is a blood collection needle used in a vacuum blood collection system, and includes a blood collection needle body inserted into a blood collection subject's blood vessel and a communication needle inserted into the vacuum blood collection tube. A blood collection needle main body fixing member having a flow path which is connected to the blood collection needle main body and has an opening on the other end side opposite to the one end, and a first end A communicating needle is fixed to the portion, and has a communicating needle fixing member having a flow path that is continuous with the communicating needle and opens to the other end side opposite to the one end. A hollow channel is disposed between the blood collection needle main body fixing member and the communication needle fixing member, and communicates the opening of the flow channel of the blood collection needle main body fixing member with the opening of the flow channel of the communication needle fixing member. A communication member is provided that is formed and is closed when the hollow channel is compressed in the length direction. The opening of the flow channel of the blood collection needle main body fixing member and the opening of the flow channel of the communication needle fixing member are brought close together in a state where the communication member is sandwiched between the blood collection needle main body fixing member and the communication needle fixing member. The blood collection needle main body fixing member and the communication needle fixing member are connected to each other.

  In a specific aspect of the present invention, the blood collection needle main body fixing member is formed with a male screw or a female screw, and the communication needle fixing member is formed with a female screw or a male screw that meshes with the male screw or the female screw. The blood collection needle main body fixing member is connected to the communication needle fixing member by a screw structure.

In still another specific aspect of the present invention, the blood collection needle main body fixing member and the communication needle fixing member have a blood collection needle main body or a communication needle main body fixed to an open end and one end, and the blood collection needle main body or communication It is a cylindrical body having an end surface portion in which a flow path that is continuous with the needle body and is open to the other end portion side of the opening end side is formed. Still another aspect of the present invention is characterized in that the communicating member is accommodated in a space formed by connecting the open end of the blood collection needle main body fixing member and the open end of the communicating needle fixing member face to face. In this particular aspect, the communication member is made of a rubber-like elastic body.

  The blood collection needle according to the present invention includes the communication member. By providing the communication member, even if a reverse flow phenomenon occurs, the hollow flow channel is blocked when the communication member is compressed in the length direction of the hollow flow channel formed in the communication member. . Further, since the communicating member is not compressed by the blood sampler's finger, blood collection operations such as replacement of the vacuum blood collection tube and removal of the blood drive body can be easily performed. In addition, it is possible to reliably prevent the collected blood from flowing back into the blood vessel of the blood sample.

  When the blood collection needle main body fixing member is connected to the communication needle fixing member by a screw structure, the blood collection needle main body fixing member and the communication needle fixing member can be reliably connected. Furthermore, when the blood collection needle main body fixing member is connected to the communication needle fixing member by a screw structure, the blood collection needle main body fixing member and the communication needle fixing member include a blood collection needle main body fixing member, a communication needle fixing member, and A stable pressing force can be applied to the communication member provided between the two. That is, the state where the communication member is compressed can be stably maintained.

  When the blood collection needle main body fixing member and the communication needle fixing member are formed of a cylindrical body having an end surface portion and an opening end, an opening end of the blood collection needle main body fixing member and an opening end of the communication needle fixing member The communication member can be accommodated in a space formed by being connected face to face. Therefore, when the communicating member can be accommodated in the space, the communicating member is not displaced, and the flow path formed in the end surface portion of the blood collection needle main body fixing member and the communicating needle fixing member is reliably communicated. Can do.

  Moreover, when the said communication member is comprised with the rubber-like elastic body, a communication member can be compressed easily.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

  FIG. 1 is a front sectional view showing a blood collection needle according to an embodiment of the present invention. A blood collection needle 1 shown in FIG. 1 has a blood collection needle body 2 that is inserted into a blood vessel of a blood collection subject, and a communication needle 3 that is inserted into a vacuum blood collection tube. The blood collection needle main body 2 and the communication needle 3 are made of a material that can pierce a blood collection subject's blood vessel and a stopper of a vacuum blood collection tube. Usually, a metal such as stainless steel is used. The blood collection needle main body 2 and the communication needle 3 are hollow needles and have a needle portion at the tip.

The blood collection needle main body fixing member 4 is formed of a cylindrical body having an end surface portion and an open end. The blood collection needle main body 2 is fixed to one end portion of the end surface portion of the blood collection needle main body fixing member 4. Further, a channel 4 a having an opening 4 b on the other end side that is continuous with the blood collection needle main body 2 and faces the opening end side of the blood collection needle main body fixing member 4 is formed on the end surface portion of the blood collection needle main body fixing member 4. ing. However, if the blood collection needle main body 2 is fixed at a position where the proximal end opening 2a of the blood collection needle main body 2 reaches the opening 4b of the end surface portion of the blood collection needle main body fixing member 4, the flow path 4b may not be formed. . On the outer peripheral surface near the opening end of the blood collection needle main body fixing member 4, one of a male screw and a female screw 4 c is formed.

  The blood collection needle main body fixing member 4 is preferably made of a hard material. Examples of such hard materials include chain or cyclic olefin resins, styrene resins, acrylic resins, ester resins, acrylonitrile resins, amide resins, alcohol resins, or modified cellulose resins. And a thermoplastic resin such as a copolymer thereof, a thermosetting resin such as a phenol resin, an ester resin, a urea resin, or a melamine resin, or a metal such as stainless steel.

  Similar to the blood collection needle main body fixing member 4, the communication needle fixing member 5 has an end surface portion and an open end, and the inner diameter of the communication needle fixing member 5 is the same as the outer diameter of the blood collection needle main body fixing member 4. Consists of equal cylinders. A cylindrical protrusion 5d is provided inside the communication needle fixing member 5 so that the communication member 6 can be compressed.

  The communication needle 3 is fixed to one end of the end surface portion of the communication needle fixing member 5. The other end side of the end surface portion of the communication needle fixing member 5 facing the opening end side of the communication needle fixing member 5 is integrated with the bottom surface of the convex portion 5d. A flow path 5 a that is continuous with the communication needle 3 and has an opening 5 b at the tip of the convex portion 5 d of the communication needle fixing member 5 is formed. However, if the communicating needle 3 is fixed at a position where the proximal end opening 3a of the communicating needle 3 reaches the opening 5b of the communicating needle fixing member 5, the flow path 5a may not be formed. On the inner peripheral surface of the communication needle fixing member 5, a female screw or male screw 5c that meshes with the male screw or female screw 4c formed on the blood collection needle main body fixing member 4 is formed.

  The communication needle fixing member 5 is moved on the outer peripheral surface of the communication needle fixing member 5 so that the opening 4b of the blood collection needle main body fixing member 4 and the opening 5b of the communication needle fixing member 5 are brought closer to or away from each other. A knob 7 is provided for adjusting the screw for this purpose. Since the screw may be directly adjusted by moving the communication needle fixing member 5 itself, the knob 7 may not be provided.

  Similarly to the blood collection needle main body fixing member 4, the communication needle fixing member 5 is preferably made of a hard material such as a thermoplastic resin, a thermosetting resin, or a metal mentioned in the above example.

  The communication member 6 is made of an elastic body such as rubber or elastomer. The communication member 6 has a cylindrical shape that fits inside the blood collection needle main body fixing member 4, and is formed with a hollow flow path 6 a that communicates the opening 4 b of the blood collection needle main body fixing member 4 and the opening 5 b of the communication needle fixing member 5. Yes. The communication member 6 is disposed inside the blood collection needle main body fixing member 4 so that the opening 4b of the blood collection needle main body fixing member 4 and the opening 5b of the communication needle fixing member 5 are communicated by the hollow flow path 6a of the communication member 6. Contained. Usually, the hollow flow path 6a of the communication member 6 is not blocked, and a state where the collected blood can easily flow must be maintained. Therefore, the blood collection needle main body fixing member 4 and the communication needle fixing member 5 are such that the opening 4b of the blood collection needle main body fixing member 4 and the hollow flow path 6a of the communication member 6 are in close contact with each other and the communication needle is fixed. The screw 5 is tightened so that the opening 5b of the member 5 and the hollow flow path 6a of the communication member 6 are in close contact with each other and the communication member 6 is not compressed by the convex portion 5d of the communication needle fixing member 5. It is connected.

  Next, a method of using the blood collection needle 1 of the present invention will be described with reference to FIGS. 2 (a) and 2 (b). As shown in FIG. 2A, the blood collection needle 1 is configured such that the opening 4 b of the blood collection needle main body fixing member 4 and the opening 5 b of the communication needle fixing member 5 are communicated by the hollow flow path 6 a of the communication member 6. Yes.

That is, the blood collected from the blood vessel of the blood sample passes through the blood collection needle body 2 and is guided to the flow path 4a. Then, it passes through the hollow flow path of the communication member 6, is guided to the flow path 5 a, and reaches the communication needle 3. One flow path is formed from the needle portion of the blood collection needle main body 2 to the needle portion of the communication needle 3.

  However, in a state where a backflow phenomenon may occur, the hollow flow path 6a of the communication member 6 may be blocked and the blood flow path may be blocked as shown in FIG.

  That is, by turning the knob 7, the screw is tightened, and the opening 4b of the blood collection needle main body fixing member 4 and the opening 5b of the communication needle fixing member 5 are brought closer. When the opening 4 b of the blood collection needle main body fixing member 4 and the opening 5 b of the communication needle fixing member 5 try to approach each other, the communication member 6 accommodated in the blood collection needle main body fixing member 4 is protruded from the convexity of the communication needle fixing member 5. A pressing force is applied by the portion 5d and the compressed state is obtained. Since the communication member 6 is made of an elastic body, it can be easily compressed by a pressing force. When the communication member 6 is compressed, the hollow flow path 6a is crushed by the wall surface of the communication member 6 and closed. Therefore, by closing the hollow flow path 6a, it is possible to block the blood flow path and prevent backflow.

  Further, the communication member 6 is compressed by the convex portion 5 d of the communication needle fixing member 5, and the compressed state of the communication member 6 is a screw structure of the blood collection needle main body fixing member 4 and the communication needle fixing member 5. Is reliably maintained. Therefore, the blood collecting person does not need to apply pressure to the communication member 6 with a finger and can use both hands, so that the blood collecting operation can be easily performed.

  In order to prevent the backflow phenomenon, the blood collection needle 1 of the present invention can be used even when the blood sampler accidentally separates the finger from the communication member 6 while applying pressure to the communication member 6 with the finger. Since the communication member 6 is maintained in a compressed state by the screw structure, no backflow occurs, that is, no human error occurs, and the backflow is reliably prevented.

  In addition, embodiment mentioned above is an example, The form by which a communicating member is accommodated in the inside of a communicating needle fixing member, and the convex part is provided in the inside of a blood collection needle main body fixing member, and a blood collection needle main body fixing member and The form in which the communicating member is accommodated so as to be sandwiched between both the communicating needle fixing member and the communicating needle fixing member may be employed.

  Further, the blood collection needle main body fixing member and the communication needle fixing member may be not only a cylindrical body, but also a rectangular tube body or other cylindrical body, and the convex portion may be not only a cylindrical body but also a rectangular column body or other column body. .

The front sectional view of the blood collection needle concerning one embodiment of the present invention. (A), (b) is front sectional drawing for demonstrating the usage method of the blood collection needle by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Blood collection needle 2 ... Blood collection needle main body 2a ... Base end opening 3 ... Communication needle 3a ... Base end opening 4 ... Blood collection needle main body fixing member 4a ... Flow path 4b ... Opening 4c ... Male screw or female screw 5 ... Communication needle fixing member 5a ... Flow path 5b ... Opening 5c ... Female screw or male screw 5d ... Convex part 6 ... Communication member 6a ... Hollow flow path 7 ... Knob

Claims (4)

A blood collection needle used in a vacuum blood collection system,
A blood collection needle inserted into the blood vessel of the blood sample,
A communicating needle inserted into the vacuum blood collection tube;
The blood collection needle main body is fixed to the one end, the blood collection needle main body fixing member having a flow path that is continuous with the blood collection needle main body and is open to the other end side opposite to the one end.
A communicating needle is fixed to the one end, a communicating needle fixing member having a flow path that is continuous with the communicating needle and opens to the other end opposite to the one end,
A hollow channel is disposed between the blood collection needle main body fixing member and the communication needle fixing member, and communicates the opening of the flow channel of the blood collection needle main body fixing member with the opening of the flow channel of the communication needle fixing member. A communication member that is formed and is compressed in the length direction of the hollow flow path, the hollow flow path is closed;
The opening of the flow channel of the blood collection needle main body fixing member and the opening of the flow channel of the communication needle fixing member are brought close together in a state where the communication member is sandwiched between the blood collection needle main body fixing member and the communication needle fixing member. The blood collection needle is characterized in that the blood collection needle main body fixing member and the communication needle fixation member are connected to each other.   The blood collection needle main body fixing member is formed with a male screw or a female screw, and the communication needle fixing member is formed with a female screw or a male screw that meshes with the male screw or the female screw. The blood collection needle according to claim 1, wherein the blood collection needle is connected by a structure. The blood collection needle main body fixing member and the communication needle fixing member have a blood collection needle main body or a communication needle main body fixed to an opening end and one end, and are connected to the blood collection needle main body or the communication needle main body and the other on the opening end side. A cylindrical body having an end surface portion in which a flow path opened to the end side is formed,
3. The communication member is accommodated in a space formed by connecting the open end of the blood collection needle main body fixing member and the open end of the communication needle fixing member facing each other. The blood collection needle described in 1. The blood collection needle according to any one of claims 1 to 3, wherein the communication member is made of a rubber-like elastic body.

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