JP2001000424A - Needle for blood sampling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable confirmation of secure centesis of a needle immediately after centesis for blood sampling. SOLUTION: This needle comprises a tubular needle portion 1 that has a hole on at least one part of the lateral side and edges on both ends, a needle support 2 arranged to cover the hole and provided with a path connecting its outside and inside through the hole, air permeating and blood non-permeating member 23 engaged with the open end on the outside of the path, a rubber cap connected to the needle support 2 to seal one end of the tubular needle 1, and a sealing member 22 capable of sealing said hole or path provided in the path.

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 puncture one end of a blood vessel of a subject and connect the other end to a vacuum blood collection tube to respond to a negative pressure in the vacuum blood collection tube. The present invention relates to a blood collection needle capable of collecting an amount of blood. According to the blood collection needle of the present invention, it is possible to confirm that one end has been punctured into the vein of the subject before the other end communicates with the vacuum blood collection tube.

[0002]

2. Description of the Related Art Conventionally, a blood collection needle has been proposed which can confirm that a needle is securely inserted into a vein of a subject, that is, a so-called flashback, before attaching the vacuum blood collection tube when collecting blood using a vacuum blood collection tube. ing. Such a conventional blood collection needle is disclosed in, for example, JP-A-61-64234.
The publication discloses a housing having a sample collection chamber having a front end and a rear end and a passage for communicating with the outside air, a cannula extending from the front end and the rear end, and an inflatable container which comes into contact with blood and expands. A blood collection needle provided with a tablet that shuts off the communication with the outside air is disclosed. However, in this blood collection needle, when a vacuum blood collection tube is attached, negative pressure is applied to the tablet, so that outside air may flow into the blood collection needle, and a predetermined blood collection amount may not be obtained.

Japanese Patent Application Laid-Open No. Hei 4-132541 has a ventilation hole for communicating an inner space of an elastic chip with an external atmosphere, and a ventilation filter is provided at an outer opening of the ventilation hole. In addition, a blood collection needle that can confirm flashback with a translucent hub or an elastic tip is disclosed. However, since the elastic tip of the blood collection needle is housed inside the blood collection needle holder and is held by hand from above, it is very difficult to confirm flashback with the elastic tip. Further, the blood that has entered the inside of the needle tube due to venous pressure when one end is punctured into the vein of the subject has a structure in which the inside of the elastic tip cavity is filled and then enters the ventilation hole. It takes time to confirm flashback.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. When a vacuum blood collection tube is installed, a negative pressure is not applied to a filter portion (hereinafter referred to as an air-permeable blood-impermeable member). It is another object of the present invention to provide a blood collection needle that can confirm flashback immediately after one end of the blood collection needle is punctured into a vein.

[0005]

As a result of intensive studies, the present inventors have made a hole in the side wall of the needle tube, provided a passage for communicating the outside with the inside of the needle tube through the hole, and further attached a vacuum blood collection tube. At times, they have found that a blood collection needle provided with a mechanism for shutting off the inside of the needle tube from the outside solves the above problem, and has reached the present invention.

That is, according to the present invention, a needle tube (A) having a hole in at least a part of a side wall and both ends being blade surfaces is provided so as to cover the hole, and the outside and the inside of the needle tube are communicated through the hole. Needle tube support (B) having a passage formed therein, an air-permeable blood impermeable member (C) locked at an open end to the outside of the passage, and the needle tube so as to seal one end of the needle tube. A blood collection needle having a rubber-like cap (D) locked to a support and a sealing member (E) provided in the passage and capable of closing the hole or the passage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the blood collection needle of the present invention. The needle tube 1 is preferably made of stainless steel. One end 1a is a blade surface and is formed so as to pierce the blood vessel of the subject, and the other end 1b is also a blade surface and formed to be inserted into a vacuum blood collection tube (not shown).

A hole 11 is provided in a side wall of the needle tube 1. The hole 11 may be provided in any part of the needle tube 1 as long as it is in the needle tube support 2. The needle tube 1 has the hole 1
1, a transparent or translucent needle tube support 2 is provided. The needle tube support 2 is hermetically fixed to the needle tube 1 on one end 1a side of the needle tube 1 by, for example, an adhesive 3.

In the needle tube support 2, there is formed a passage 21 for communicating the outside with the inside of the needle tube 1 through the hole 11. As long as the passage 21 communicates with the outside, the open end to the outside may be provided anywhere. When the blade surface of one end 1 a of the needle tube 1 is punctured into the vein of the subject by the passage 21, the blood that has entered the inside of the needle tube 1 passes through the hole 11.
The flashback can be confirmed by visually checking the invaded blood from the side of the needle tube support 2 through the passage 21 through the passage 21.

In the passage 21, a sealing member 22 is provided. As the sealing member 22, a plastic material such as polypropylene, Teflon (registered trademark) and silicon rubber can be used, but a metal such as stainless steel or a ceramic may be used. In the passage 21, there is a gap between the sealing member 22 and the needle tube support 2 through which air and blood can pass.

An air-permeable, blood-impermeable member 23 is hermetically locked at the open end of the passage 21 to the outside of the needle tube 1. With this member 23, the blood that has flowed in during blood collection does not leak to the outside while maintaining the air permeability in the passage 21. As the air-permeable blood impermeable member 23, a layered filter made of a polymer sintered body such as polypropylene or polyethylene is preferably used, but a so-called film-shaped so-called film made of a hydrophobic resin such as polypropylene or polyethylene is normally used. It may be a membrane filter.

As shown in FIG. 2, when one end 1a of the needle tube 1 is punctured into a subject, blood flowing into the passage 21 from the inside of the needle tube 1 through the hole 11 is sealed by the sealing member 22 and the needle tube support. It passes through the gap with the body 2 and is blocked by the air-permeable blood-impermeable member 23. Thereafter, when the vacuum blood collection tube is attached to the other end 1b of the needle tube 1, the sealing member 22 is drawn to the needle tube 1 by the negative pressure of the vacuum blood collection tube, as shown in FIG.
Block passage 21. Thus, since a negative pressure is not directly applied to the air-permeable blood-impermeable member 23, a predetermined blood collection amount can be obtained. The passage 21 has a sealing member 22 therein.
It is more preferable to provide the convex portion 24 for locking the needle tube 1 in consideration of the sealing property inside the needle tube 1. As the shape of the convex portion 24, in addition to the shape shown in FIG. 1 having an L-shaped cross-section, a shape that expands in a tapered shape toward the open end, or a shape that projects inward of the passage at an intermediate portion of the passage 21 And the like.

As the air-permeable blood-impermeable member 23, a swelling substance such as an acrylic acid-based copolymer, starch and gelatin can be used alone or as a mixture with other compounds. When one end 1a of the needle tube 1 is punctured into the subject, the air-permeable blood-impermeable member 23 expanded by the inflowing blood passes the sealing member 22 directly to the needle tube 1 or a passage as shown in FIG. Convex part 2 in 21
4 to close the hole 11 or the passage 21. Thereby, immediately after confirming the flash bag, the inside of the needle tube 1 is sealed. When the vacuum blood collection tube is attached, the sealing member 22 is further connected to the needle tube 1 by the negative pressure of the vacuum blood collection tube.
Alternatively, the sealing property of the inside of the needle tube 1 is further improved because it is in close contact with the convex portion 24.

On the other end 1b side of the needle tube support 2, a rubber cap 4 for sealingly covering the blade surface of the needle tube 1 is locked by a flange 25. As a material for the rubber cap 4, synthetic isoprene rubber, silicon rubber, or the like is employed. A thread 26 is formed in the needle tube support 2, and by screwing into a mouth (not shown) of the holder, the blood collection needle and the holder can be integrated.

[0015]

By providing a hole in a part of the side wall of the blood collection needle of the present invention, flashback can be immediately confirmed after one end of the blood collection needle is punctured into a vein. Also,
Because it has a sealing member, when attaching a vacuum blood collection tube,
There is no possibility that negative pressure is applied to the air-permeable blood-impermeable member.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a blood collection needle according to one embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a needle tube support part of the blood collection needle of FIG. 1;

FIG. 3 is an enlarged cross-sectional view of a needle tube support portion of the blood collection needle of FIG. 1 when a vacuum blood collection tube is attached.

FIG. 4 is an enlarged sectional view of a needle tube support portion of another blood collection needle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Needle tube 11 hole 2 Needle tube support 21 Passage 22 Sealing member 23 Air permeable blood impermeable member 24 Convex part 4 Rubber cap

Claims (4)

[Claims] 1. A needle tube (A) having a hole in at least a part of a side wall, both ends of which are blade surfaces, provided so as to cover the hole,
A needle tube support (B) having a passage communicating the outside with the inside of the needle tube through the hole, an air-permeable blood-impermeable member (C) locked at the open end of the passage to the outside, A rubber-like cap (D) locked to the needle tube support so as to seal one end, and provided in the passage;
A blood collection needle having a sealing member (E) capable of closing the hole or the passage. 2. The blood collection needle according to claim 1, wherein the passage has a projection for locking the sealing member. 3. The blood collection needle according to claim 1, wherein the air-permeable blood-impermeable member is a swelling substance. 4. The blood collection needle according to claim 1, wherein the needle tube support is transparent or translucent.