JPH08257018A - Blood-gathering adapter - Google Patents

Abstract

PURPOSE: To provide a blood-gathering adapter by which the fact that the edge tip is stuck into a blood vessel can be confirmed since blood flows in an intermediate part of its transparent hub when the edge tip of an injection needle connected to this is stuck into a blood vessel. CONSTITUTION: A blood gathering adapter is composed of a hollow cannula 1 having the edge tip 11 on the tip, a transparent hollow hub 2 to support and fix a rear end part of this cannula 1 by its tip part and a cap member 3 which is put on the cannula 1 and is made of a rubber elastic body. An injection needle connecting part 21 is arranged in a rear end part of the hub 2, and a ventilating passage 22 is arranged in an intermediate part of the hub 2, and an outlet of this ventilating passage 22 is blocked up by a gas permeable and liquid impermeable filter member 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood collecting adapter. More specifically, it is a blood collection adapter used for a vacuum blood collection tube for collecting blood from a blood vessel, and it can be used as a blood collection needle by connecting a normal injection needle to this, and the cutting edge was inserted into the blood vessel. The present invention relates to a blood collection adapter that can be confirmed.

[0002]

2. Description of the Related Art Conventionally, when collecting blood from a blood collection tube,
Blood was collected using a blood collection needle as shown in FIG. 4, and it was confirmed by experience and experience that the cutting edge entered the blood vessel.
However, with blood collection that relies on such intuition and experience, in the case of a beginner with little intuition or experience, or a patient with thin blood vessels that are difficult to see or can not see, it is not possible to confirm the insertion of the cutting edge into the blood vessel, so it is stabbed many times. Therefore, it may impose a heavy burden on both the blood collector and the blood recipient, and in some cases, a new vacuum blood collection tube, blood collection needle, or other blood collection device should be prepared. It was uneconomical to collect blood again. Therefore, a blood collection needle that can confirm that the cutting edge has been inserted into a blood vessel has been proposed (JP-A-4-132541 and the like).

In the blood collecting needle disclosed in the above-mentioned JP-A-4-132541, the hub is provided with a ventilation hole for communicating the inner cavity of the elastic tip with the external atmosphere, and the ventilation filter is attached to the external opening of the ventilation hole. The present invention is characterized by confirming that blood has flown into a blood collection needle (so-called flashback) to confirm that the cutting edge has been inserted into a blood vessel. However, since the blood collection needle described above tries to guide the blood flowing into the elastic tip to the ventilation hole of the transparent hub, it takes a long time to confirm the flashback, and the blood accumulated inside the elastic tip is not collected. There is a risk of leakage, which is a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when the cutting edge of the injection needle connected thereto is inserted into a blood vessel, the intermediate portion of the transparent hub thereof. It is an object of the present invention to provide a blood sampling adapter that allows confirmation that blood has flowed into the blood vessel and that the cutting edge has been inserted into the blood vessel. Moreover, it aims at providing the blood-collecting needle which consists of a combination of this blood-collecting adapter and the injection needle.

[0005]

In order to solve the above problems, the present invention provides a hollow canula having a cutting edge at the tip,
While supporting and fixing the rear end of the canula at its tip, a transparent hollow hub having a needle connection portion at the rear end of which the hub of the needle can be inserted in a liquid-tight manner, and the canula A cap member made of a capped rubber elastic body is provided, and an air passage for communicating the hollow portion with the outside air is provided in a hollow portion between the distal end portion of the hub and the injection needle connecting portion. A blood sampling adapter is used whose outlet is blocked by a gas-permeable and liquid-impermeable filter member. In addition, a configuration in which an injection needle is connected to this blood sampling adapter is adopted. Here, the needle connecting portion may be formed on a luer tip that can be fitted with a hub of the needle to be connected thereto, and the outer side of the luer tip may be concentrically formed with the hub of the needle. A female coupling means capable of coupling or lure coupling may be provided.

[0006]

According to the above construction, when the blood collection adapter is attached to the blood collection needle holder, the injection needle is connected to the injection needle connection portion, and the injection needle is inserted into the blood vessel, the hollow portion of the injection needle and the blood collection needle are collected. The air existing in the hollow part of the adapter passes through the air passage of the blood collecting adapter and is expelled to the outside through the gas-permeable filter member by the inflowing blood, so the blood passes through the hollow part of the injection needle for blood collection. It flows into the hollow part of the adapter and further through the ventilation passage to reach the filter member. Therefore, by observing the ventilation passage formed in the transparent hub, it is possible to easily confirm the insertion of the injection needle into the blood vessel. Further, at this time, since the filter member is liquid impermeable, blood does not pass through the filter member and leak to the outside.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical sectional view of a blood collecting adapter according to an embodiment of the present invention, and FIG. 2 is a view showing another embodiment, and FIG.
[Fig. 2] is a view showing a state in which an injection needle is attached to the blood collecting adapter shown in Fig. 1. As shown in FIG. 1, the blood collecting adapter of the present invention comprises a hollow canula 1 having a blade tip 11 at its tip,
It comprises a transparent hollow hub 2 which supports and fixes the rear end of the canula 1 at its tip, and a rubber elastic cap member 3 capped on the canula 1. An injection needle connection portion 21 is provided at the rear end of the hub 2,
An air passage 22 is provided in an intermediate portion of the air passage 22, and an outlet of the air passage 22 is a gas permeable and liquid impermeable filter member 2
It is blocked by 3.

The hub 2 is a hollow member made of transparent synthetic resin such as polyethylene, polypropylene, polyester, polystyrene or the like, and has a front end portion, an intermediate portion and a rear end portion. The rear end of the canula 1, which is generally made of stainless steel, is inserted into the hollow portion 25 at the tip of the hub 2 and fixed with an adhesive. The canula 1 is made of a rubber elastic material such as natural rubber or A cap member 3 made of isoprene rubber, butadiene rubber, nitrile rubber or the like is covered. Further, a male screw 26 such as a male coupling means is formed on the outer wall of the distal end portion of the hub 2 so that it can be screwed into a blood collection needle holder (not shown).

The needle connecting portion 2 having a hollow portion 24 at the rear end portion of the hub 2 which communicates with a hollow portion 25 at the front end portion of the hub 2.
The outer diameter is generally tapered to form a so-called luer tip so that the hub 41 of the injection needle 4 can be fitted. The hub 4 of the injection needle 4 is provided outside the injection needle connection portion 21 formed on the lure tip during the blood collection operation.
1 so that it does not fall from the needle connection portion 21,
For example, as shown in FIG. 2, a hood-shaped female coupling means 27 extending concentrically from the intermediate portion of the hub 2 in the direction of the injection needle connection portion 21 is provided, and provided on the outer wall of the end portion of the hub 41 of the injection needle 4. Alternatively, a male type coupling means (not shown) may be screwed or luered. As the injection needle connecting portion 21, a male coupling member that is inserted into the hub 41 of the injection needle 4 is usually adopted, but a female coupling member is formed by forming the injection needle hub at the male coupling end. It is also possible to employ the coupling member of.

An intermediate portion of the hub 2 is a wide brim-like protruding portion, and a ventilation passage 22 for communicating the hollow portion 24 with the outside air is provided. The outlet of the ventilation passage 22 is the filter member 2.
It is blocked by 3. The filter member 23 is a gas permeable and liquid impermeable filter (hydrophobic filter).
As such a filter, a layered filter made of a polymer sintered body such as polypropylene or polyethylene is usually preferably used, but a membrane-shaped so-called membrane filter made of a hydrophobic resin such as polypropylene or polyethylene is preferably used. It doesn't matter.

Next, the use of the blood collecting adapter of the present invention will be described with reference to FIG. First, the blood collecting adapter A is attached to a blood collecting needle holder (not shown), and the injection needle 4 is connected to the injection needle connecting portion 21 of the blood collecting adapter A.
Next, when the cutting edge 43 of the injection needle 4 is inserted into the blood vessel, the injection needle 4
Hollow portion 44 of blood vessel 2 and hollow portion 2 of adapter A for blood collection
The air existing in Nos. 4 and 25 is expelled to the outside by the inflowing blood, passing through the air passage 22 of the blood collecting adapter A, permeating the gas permeable filter member 23. Then, the blood flows through the hollow portion 44 of the injection needle 4 into the hollow portion 24 of the blood collecting adapter A, and further reaches the filter member 23 through the air passage 22. Therefore, by observing the injection needle connection portion 21 and the air passage 22 provided on the transparent hub 2, it is possible to easily confirm the insertion of the cutting edge 43 of the injection needle 4 into the blood vessel. Further, at this time, since the filter member 23 is liquid impermeable, blood does not pass through the filter member 23 and leak to the outside.

[0012]

As is apparent from the above description, the following effects can be obtained by adopting the blood collecting adapter of the present invention. It is economical because it can be used as a blood sampling needle by connecting an ordinary injection needle. Since it is possible to easily confirm that the blade tip of the injection needle connected thereto has been inserted into the blood vessel, it is possible to eliminate the burden on the blood collecting person due to the reinsertion of the injection needle. No need to collect blood again.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a blood collection adapter according to an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a view showing a state in which an injection needle is attached to the blood collecting adapter shown in FIG.

FIG. 4 is a diagram showing a conventional blood collection needle.

[Explanation of symbols]

 1 Canula 2 Hub 21 Injection needle connection part 22 Ventilation path 23 Filter member 27 Female coupling means 3 Cap member 4 Injection needle A Blood collection adapter

Claims (4)

[Claims] 1. A hollow canula having a cutting edge at its tip and an injection needle capable of supporting and fixing the rear end of the canula at its tip, and at the rear end of which a hub of the injection needle is liquid-tightly inserted. A transparent hollow hub provided with a connecting portion, and a rubber elastic cap member capped on the canula, wherein the hollow portion is provided in the hollow portion between the distal end portion of the hub and the injection needle connecting portion. A blood sampling adapter in which a vent passage communicating with the outside air is provided, and an outlet of the vent passage is closed with a gas-permeable and liquid-impermeable filter member. 2. The blood collecting adapter according to claim 1, wherein the injection needle connecting portion is formed on a luer tip capable of fitting with a hub of the injection needle. 3. A female coupling means concentric with the luer tip and provided outside the luer tip so as to be capable of coupling with a hub of an injection needle.
Blood collection adapter described in. 4. A blood collecting needle comprising an injection needle connected to the blood collecting adapter according to claim 1.