JPH08275933A - Blood-gathering needle - Google Patents

Abstract

PURPOSE: To provide a blood-gathering needle whose constitution is extremely simple and which is easily manufactured and has a mechanism capable of reliably confirming flashback. CONSTITUTION: A blood-gathering needle is provided with an almost cylindrical hub 10, continuously integrated cannulas 41 and 45 which respectively extend from the shaft directional both ends of the hub 10 and whose internal passages are communicated with each other and have the sharp tip and a bottomed cylindrical elastic chip 50 liquidtightly fitted to and installed on the hub 10 so as to surround one extending ends of the cannulas 41 and 45, and the elastic chip 50 is formed of a transparent or semitransparent construction material, and the hub 10 is provided with a shaft directional communicating hole to insert and fix the cannulas 41 and 45 and air vents 13 and 19 to communicate a lumen part E of the bottomed cylindrical elastic chip 50 and an external atmosphere with each other. A gas permeable filter 8 having pores which pass gas and do not pass liquid is fixed to external port parts of the air vents 13 and 19, and the external port parts where the air vents 13 and 19 communicate with an external atmosphere are constituted so as to be formed on the more tip side than a connecting part with a holder being one unit of a blood-gathering unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood collection needle, and more particularly to a blood collection needle that allows one sample source to communicate with a sample storage chamber that has been made negative pressure in advance to enable one or more sample collections.

[0002]

2. Description of the Related Art Heretofore, in performing a clinical test, a blood collecting unit has been frequently used which enables a plurality of blood collections with one puncture. This unit includes, for example, as shown in FIG. 5, canulas 120 and 130 provided at both ends of a hub 110, and a blood collection needle 1 provided with elastic tips attached so as to surround the canula 130.
00 and a cylindrical holder 20 for fixing the blood collecting needle 100
0, and a blood collection tube 300 that is previously attached to the inside of the holder 200 and has a negative pressure. When collecting blood, first, the holder 200 and the blood collecting needle 100 are preassembled and integrated, and the puncture venous blood vessel is secured on the canula 120 side inside the venous blood vessel. Then, the blood collection tube 300 is placed inside the holder.
The blood collection is started by pushing in and penetrating the rubber stopper 310 with the canula 130, and the blood collection is completed in a state where the pressure inside the blood collection tube 300 and the venous pressure are balanced.

However, in such a conventional vacuum blood sampling system, there is no escape place for gas inside the canula and inside the elastic tip during venipuncture, and so-called flashback confirmation is impossible. Therefore, there is a risk that the blood will start to be collected while leaving the vein and leaving the canula in the body.

In order to solve such a problem, Japanese Patent Publication No. 1-27749, Japanese Patent Publication No. 1-31391,
Japanese Patent Publication No. 21809/1990 discloses a needle assembly having a mechanism for confirming flashback.

[0005]

[Problems to be Solved by the Invention]
In 27749 and Japanese Patent Publication No. 1-31391,
The rubber sheath is transparent or semi-transparent, and a liquid-tight breathable member is provided at least at one place of the rubber sheath or the fitted locking part formed on the rear part of the hub, and the inside of the rubber sheath is only through this liquid-tight breathable member. A structure in which a rubber sheath is fitted on the outer side of the liquid-tight air-permeable member is adopted so that ventilation between the outside and the outside can be achieved. However, the liquid-tight gas-permeable members disclosed in these publications have complicated structures, and it takes time and cost to manufacture and assemble them, and thus they cannot be said to be excellent in mass productivity.

In Japanese Patent Publication No. 21809/1990, a ventilation device as a communication passage provided inside a hub and an annular compressed material having a material characteristic of being swelled by moisture when inserted into the communication passage in the device. Although a blood collecting needle including a sleeve and the like has been disclosed, this also has a problem that its structure is extremely complicated and cannot be mass-produced at low cost. Further, this one adopts a structure in which a housing chamber for accommodating a blood sample and a vent hole are formed by combining two members each having a separated needle, so that the inside of the housing chamber is kept at the time of blood sampling. Negative pressure is applied to the stored sleeve, resulting in insufficient sealing between the outside and safety. Also, the dead volume is large.

The present invention has been made to solve the above problems, and its object is to provide a blood sampling needle having a very simple structure, easy to manufacture, and having a mechanism capable of surely confirming flashback. Especially.

In order to solve such a problem, the present invention is a continuous / integral structure having a substantially cylindrical hub and sharp tips extending from both axial ends of the hub and having internal passages communicating with each other. And a bottomed cylindrical elastic tip fitted in a liquid-tight manner on the hub so as to surround one extending end of the canula, and the elastic tip is transparent or translucent. The hub is formed of a material, and the hub has an axial communication hole for inserting and fixing a canula, and a vent hole for communicating the inner cavity of the bottomed tubular elastic tip with an external atmosphere, A gas permeable filter having pores that allow gas to pass therethrough and liquid not to pass through is fixed to the outer opening of the air vent, and the outer opening communicating with the outer atmosphere of the air vent is a part of the blood collection unit. The shape is closer to the tip than the connection with the holder, which is a unit. It was constructed as is.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the blood collecting needle of the present invention will be described below with reference to FIG.

The blood collecting needle 1 of the present invention includes a hub 10 having a substantially cylindrical shape,
Canulas 41 and 45 extending from both axial ends of the hub 10, and a bottomed cylindrical elastic tip 50 fitted to one end of the hub 10 so as to surround one extending end of the canula 45. And have. The hub 10 has a substantially cylindrical shape, and a communication hole 13 penetrating in the direction of the central axis, a communication hole 13 for communicating the inner cavity portion E of the bottomed cylindrical elastic tip 50 with the outside atmosphere. And pores 19.

The communication hole 13 is a hole for inserting and fixing the canulas 41 and 45, and has an inner diameter slightly larger than the outer diameters of the canulas 41 and 45. Normally, the diameter difference of the canula is 0
It is about 0.3 mm.

The vent hole 19 is installed so that one end 19a thereof is located at the rear end portion of the hub 10 and communicates with the inner cavity portion E of the elastic tip 50, and the other end portion 19b of the vent hole 19 has an external opening portion. , Is formed so as to communicate with the external atmosphere, and is formed on the outer circumference of the body of the hub 10 on the tip side (the tip side is the direction of the canula 41) with respect to the connecting portion with the holder which is one unit of the blood collecting unit. . That is, in the present embodiment, the vent hole 19 is provided in the axial direction from the one end 19a in the axial direction with a predetermined partition wall 21 separated from the axial communication hole 13, and then the vent hole 19 is oriented in the outer peripheral direction. Instead, it has an L-shape that is provided outside.

The cross-sectional shape of the vent hole 19 is usually a circular shape, but is not limited to this and various shapes can be adopted. The diameter of the vent hole 19 is about 0.2 to 2 mm.

The breathable filter 7 is attached to the other end 19b communicating with the outside atmosphere of the vent hole 19 by ultrasonic welding, heat welding or the like. This breathable filter 7
It has pores that allow gas to pass through and does not allow liquid to pass through. It preferably has water repellency and is constituted by containing a fluorine-based resin such as Teflon or an olefin-based resin such as PP or PE. It

Further, the hub 10 is provided with a threaded portion 15 on the outer periphery of the substantially central portion of the main body of the hub 10, and the mouth portion of the holder 200, which is one unit of the blood sampling unit, is screwed into the threaded portion 15. Has become. Further, a locking portion 17 for locking the elastic tip 50 is formed at the rear end of the hub 10. The locking portion 17 is not particularly limited as long as the elastic tip 50 cannot be easily detached. In the case of the present embodiment, the locking portion 17 is provided with a locking projection 17a protruding like a jaw. There is.

The elastic tip 50 to be engaged with such a locking portion has a cylindrical shape having a bottom portion 51, and has an inner cavity portion E as a space surrounding the extending end of one canula 45. The elastic tip 50 is required to have appropriate elasticity so that it can be resealed again after being temporarily perforated by the canula 45 at the time of blood collection. The elastic tip 50 is
Use a transparent or semi-transparent material so that flashback can be confirmed. Examples of the material used include synthetic rubber and elastomer. The dimensions of such an elastic tip are usually about 10 to 30 mm in length and about 1 to 3 mm in outer diameter.

By the way, the sharp tip of the canula 41 and the sharp tip of the canula 45, which are inserted into the communication hole 13 of the hub 10, are respectively used as a source of a sample such as blood in a venous blood vessel at the time of collecting a sample. It is punctured into a sample storage chamber such as a so-called vacuum blood collection tube. Canula 41 and Canula 45 are
As shown in the figure, the one that is continuous and integrated is used. Such canulas 41 and 45 are fixed by various adhesives while being inserted into the communication hole 13. The hub 10 is usually made of a material molded by injection molding. In the present invention, the flashback can be confirmed at the elastic tip 50.
However, if you want to check flashback,
The hub 10 is made of a transparent or translucent material. Specific examples thereof include resin materials such as polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polymethylpentene, polycarbonate, polyacrylonitrile, and ABS. The size of the hub 10 is 10 to 30 m in length.
m, outer diameter is about 5 to 15 mm.

Next, a second embodiment of the blood collecting needle of the present invention will be described with reference to FIG.

The blood collection needle 2 of the second embodiment is fundamentally different from that of the first embodiment in the structure of the vent hole formed in the hub. That is, the vent hole 69 of the second embodiment.
Is formed such that a part thereof, particularly, a portion formed in the axial direction is connected to the axial communication hole 63. Therefore, when the canula is inserted into the communication hole 63, a part of the outer circumference of the canula constitutes a part of the communication hole 69. With such a structure, the outer diameter of the locking portion 67 for locking the elastic tip 50 can be reduced, and the communication hole can be easily formed by injection molding.

[0020]

The operation and effect of the present invention will be described below. As shown in FIG. 3, the threaded portion 15 provided on the outer periphery of the hub 10 of the blood collection needle 1 has a holder 2
The mouth of No. 00 is screwed, and the blood collection needle and the holder 200 are integrated. In this state, the first canula 41 of the blood collecting needle is punctured into the blood vessel V. Then, the blood in the blood vessel V becomes canula 4
1 through the inner hole of the canula 45 and then flows into the inner cavity E of the elastic tip. At this time, since the elastic chip is made of a transparent or translucent material, flashback can be confirmed. Thereafter, the blood in the inner cavity portion E of the elastic tip further rises inside the ventilation hole and stops at the ventilation filter 7.

When the inventors of the present invention actually conducted a flashback confirmation experiment, it was confirmed that 5 cm aq. Flashback was confirmed even at low venous pressure.

In the present invention, in order to ensure the inflow of blood and to visually confirm this by providing a gas escape place in the inner cavity of the elastic tip 50,
In particular, it adopts an ingenious hub structure. That is, the hub used in the present invention has an axial communication hole for inserting and fixing a canula, and a vent hole for communicating the inner cavity portion of the bottomed tubular elastic tip with the external atmosphere, A gas permeable filter having pores that allow gas to pass but does not allow liquid to pass is fixed to the external opening of the vent,
Since the external opening portion communicating with the external atmosphere of the vent hole is configured to be formed on the tip side with respect to the connection portion with the holder which is one unit of the blood sampling unit, the structure is extremely simple and easy to mold, Can be easily manufactured.

Therefore, the blood collecting needle of the present invention has an effect that flashback can be surely confirmed with an extremely simple structure.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a blood collection needle as a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a blood collection needle as a second embodiment of the present invention.

FIG. 3 is a schematic view for explaining the action of the blood collection needle of the present invention.

FIG. 4 is a cross-sectional view for explaining a state during blood collection.

FIG. 5 is an exploded perspective view of a blood collection unit.

[Explanation of symbols]

 1, 2 ... Blood collection needle 7 ... Breathable filter 10, 60 ... Hub 13, 63 ... Communication hole 19, 69 ... Vent hole 41 ... First canula 45 ... Second canula 50 ... Elastic tip E ... Lumen part

Claims (3)

[Claims] 1. A substantially cylindrical hub, a continuous / integrated canula that extends from both axial ends of the hub, and has a sharp tip that communicates with an internal passage, and one extension of the canula. And a bottomed tubular elastic tip that is liquid-tightly fitted to the hub so as to surround the end, the elastic tip is made of a transparent or translucent material, and the hub is a canula. Has an axial communication hole for inserting and fixing, and a vent hole that communicates the inner cavity of the bottomed tubular elastic tip with an external atmosphere, and gas is provided at the external opening of the vent hole. An air-permeable filter having pores that allow the liquid to pass therethrough is fixed, and the external port communicating with the external atmosphere of the vent has a tip end side with respect to a connection portion with a holder that is one unit of the blood sampling unit. A blood collection needle, which is formed on the. 2. The blood collecting needle according to claim 1, wherein the vent hole is formed to have a predetermined length in the axial direction, and then has an L shape which is turned to the outer peripheral direction and is bored outside. . 3. The vent hole includes a portion bored in the axial direction, and the portion bored in the axial direction is connected to an axial communication hole for inserting and fixing the canula. The blood collecting needle according to claim 1, which is formed by: