JP2001299729A - Blood drawing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blood drawing instrument in which flashback can be easily confirmed without providing an air-permeable and blood in permeable filter. SOLUTION: In a blood drawing instrument 1 consisting of a blood drawing needle 2 with a needle pipe 3 with sharp edges 31 and 32, a hub 4 inserted outside at the middle site of the needle pipe 3 and an elastic cap 5 hermetically fitted on the base end side of the hub 4 and a blood drawing pipe holder 7 connected with the blood drawing needle 2, the above described hub 4 has a communication hole 43 for communicating the inside of the elastic cap 5 with the outside atmosphere and an air passing hole 44, and an elastic member 6 is provided on the exterior opening part 45 of the air-passing hole 44 and the above described blood drawing pipe holder 7 has a tub 73 on its apex, and by pushing down the above described elastic member 6 into the air-passing hole 44 by means of a projection 74 provided in the above described tub 73, the inside of the above described blood drawing needle 2 is communicated with the outside atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood collection device, and more particularly, to puncturing one end of a needle tube into a blood vessel of a subject and connecting 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 device including a blood collection needle capable of collecting a large amount of blood, and a blood collection tube holder for easily attaching a vacuum blood collection tube to the blood collection needle. According to the blood collection device of the present invention, it is possible to confirm that one end of the needle tube has been punctured into the vein of the subject before the other end of the needle tube communicates with the vacuum blood collection tube.

[0002]

2. Description of the Related Art Conventionally, when blood is collected by a vacuum blood collection tube, before attaching a blood collection tube holder and a vacuum blood collection tube,
A blood collection needle has been proposed that can confirm that the needle has been reliably punctured into the vein of a subject, that is, a flashback.

[0003] As such a blood collection needle, for example, a substantially cylindrical hub, a needle tube having a sharp tip extending from both ends in the axial direction of the hub, and a hub attached to the hub so as to surround one end of the needle tube. It consists of a bottomed tubular elastic cap fitted,
A blood sampling needle is provided in the hub with a ventilation hole for communicating the inside and the outside of the elastic cap, and an air-permeable blood impermeable filter is provided in an external opening 45 of the ventilation hole (Japanese Patent Laid-Open No. 4333253, No. 4364831,
JP-A-7-379, JP-A-8-150134, etc.). These blood collection needles, while piercing the blood collection needle into the vein of the subject, to release air so that blood flows into the blood collection needle to confirm flashback, An air-permeable, blood-impermeable filter is provided to prevent leakage to the outside. As the air-permeable blood-impermeable filter, a membrane filter, a sintered filter, or the like is used. However, all of them are expensive and fragile, so that care must be taken when handling them.

[0004] In consideration of the above problems, a blood collection device or a blood collection needle capable of confirming flashback without using an air-permeable blood-impermeable filter has been developed (Japanese Patent Application Laid-Open No. Hei 6-1994).
-7330, JP-A-11-169359). In the blood collection device disclosed in Japanese Patent Application Laid-Open No. H6-7330, a pressure changing means is provided in a blood collection tube holder, and a blood collection needle is placed in a vein of a subject with the pressure inside the elastic cap being negative. The flashback can be confirmed by utilizing the action of trying to return the pressure inside the elastic cap to normal pressure by puncturing and then releasing the pressure changing means. However, because the structure of the transformer is complicated,
Manufacturing costs increase. Further, by providing the pressure transforming means and using an elastic cap having an internal volume in which the pressure can be varied by the pressure transforming means, the blood collecting instrument becomes large in size and is not practical.

On the other hand, in a vacuum blood collection needle disclosed in Japanese Patent Application Laid-Open No. 11-169359, a lumen is formed in a hub, and when the blood collection needle is punctured into a vein of a subject, the blood pressure in the blood vessel causes the blood collection needle. When air in the lumen is compressed and blood flows into the lumen, flashback can be confirmed. However, the vacuum blood collection needle also needs to have a large volume in order for blood to flow into the lumen due to blood pressure in a blood vessel, and the shape of the vacuum blood collection needle becomes large.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is a blood collection device that can easily confirm flashback without providing an air-permeable blood-impermeable filter, and has a simple configuration and a simple shape. An object of the present invention is to provide a blood collection device that does not grow.

[0007]

The inventor of the present invention has made various studies to solve the above-mentioned problems. As a result, the blood sampling needle was replaced with an elastic member instead of the air-permeable blood-impermeable filter conventionally provided. By providing a member that pushes down the elastic member to allow the inside of the blood collection needle to communicate with the external atmosphere on the blood collection tube holder attached to the base end of the blood collection tube, the structure is simple and the flashback can be easily confirmed. The inventors have found that a device can be obtained, and arrived at the present invention.

That is, the present invention provides a needle tube having a sharp cutting edge at a distal end and a proximal end, a hub externally inserted at an intermediate portion of the needle tube, and a base tube of the needle tube which is hermetically attached to a base end side of the hub. In a blood collection device including a blood collection needle having an elastic cap formed to house an end edge, and a blood collection tube holder connected to the proximal end of the blood collection needle, the hub is configured so that the inside of the elastic cap is an external atmosphere. An elastic member is provided in the external opening 45 of the air hole, and the blood collection tube holder has a tab at the distal end thereof extending toward the distal end of the blood collection needle. The blood collection device is characterized in that the inside of the blood collection needle is communicated with an external atmosphere by pushing down the elastic member into a ventilation hole by a projection provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a blood collection device of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.
The present invention is not limited to these blood collection devices.
FIG. 1 is a cross-sectional view showing one embodiment of the blood collection device of the present invention, and FIG. 3 is a cross-sectional view showing a state when flashback is confirmed in the blood collection device shown in FIG. Also,
FIG. 5 is a sectional view showing another embodiment of the blood collecting instrument of the present invention. The blood collection device 1 of the present invention includes a needle tube 3 having sharp cutting edges 31 and 32 at the distal end and the proximal end, a hub 4 externally inserted at an intermediate portion of the needle tube 3, and an elasticity attached to the proximal end side of the hub 4. It comprises a blood collection needle 2 having a cap 5 and a blood collection tube holder 7 connected to the blood collection needle 2. In the blood collection device 1 of the present invention, the tip is the side to puncture the patient (in the figure,
The left side) and the proximal end indicate the side (right side in the figure) for puncturing a vacuum blood collection tube (not shown).

The needle tube 3 in the present invention is a hollow tube,
Sharp cutting edges 31, 32 are formed at the distal end and the proximal end. The cutting edge 31 has a sloped blade surface for the patient, and the cutting edge 32 has a slanted cutting surface to reduce piercing resistance when puncturing a vacuum blood collection tube. Examples of the material of the needle tube 3 include metal materials such as stainless steel, aluminum, titanium, and alloys thereof.

A hub 4 is externally inserted at an intermediate portion of the needle tube 3. The hub 4 has an elastic member 6 described later inside.
Is formed from two members, a distal end portion 41 and a proximal end portion 42, as shown in FIG. The distal end portion 41 and the proximal end portion 42 are assembled by fitting, fusion by ultrasonic waves or heat, or by an adhesive or the like.
To form The hub 4 has a communication hole 43 penetrating in the center axis direction therein and a ventilation hole 44 connected to the communication hole 43. The communication hole 43 is a hole for inserting and fixing the needle tube 3. When the needle tube 3 is inserted, the communication hole 43 forms a gap through which blood flowing into the elastic cap 5 described later can pass. In addition, it is formed slightly larger than the outer diameter of the needle tube 3. Further, the ventilation hole 44 is provided in the outer peripheral direction in connection with the communication hole 43, and has one or more external openings 45 for communicating the inside of the elastic cap 5 with the external atmosphere. ing. The needle tube 3 is inserted into the communication hole 43 of the hub 4,
The needle tube 3 is air-tightly fixed to the hub 4 on the distal end side of the distal end portion 41 of the hub 4 by an adhesive S, for example. The adhesive S may be used to fill a part of the gap between the communication hole 43 and the needle tube 3 as shown in FIG. As the adhesive S, an epoxy curing agent, a UV curing adhesive, or the like is used. A screw portion 46 is provided on the outer periphery of the base end portion 42 of the hub 4, and a blood collection tube holder 7 for holding a vacuum blood collection tube (not shown) on the screw portion 46.
Port 71 is screwed. The hub 4
Is preferably formed of a transparent or translucent material in order to easily confirm flashback,
Specifically, polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polymethylpentene, polycarbonate, polyacrylonitrile, ABS
Resins.

An elastic cap 5 is hermetically attached to the base end side of the base end 42 of the hub 4 inside the blood collection tube holder 7. The elastic cap 5 has a cylindrical shape with a bottom and is capable of accommodating the cutting edge 32 at the proximal end side of the needle tube 3 and having a gap between the needle tube 3 and the needle tube 3 through which blood can pass. Is formed. Examples of the material of the elastic cap 5 include natural rubber, synthetic rubber such as isoprene rubber and silicon rubber, and elastomer. Further, the elastic cap 5 may be transparent or translucent so that flashback can be easily confirmed.

An elastic member 6 is hermetically provided in an external opening 45 of a ventilation hole 44 provided in the hub 4. FIG. 2 is a sectional view taken along line AA of the blood collection device 1 shown in FIG. The elastic member 6 may be a tubular body as shown in FIG. When the elastic member 6 is a tubular body, it is preferable that the inner diameter is larger than the outer diameter of the needle tube 3, and the outer diameter and the length are large enough to fit in the air hole 44 in an airtight manner. In order to ensure the airtightness of the ventilation hole 44, a projection 47 for locking the elastic member 6 may be provided in the external opening 45. The elastic member 6 is preferably formed of a material that can be elastically deformed, and specific examples thereof include a thermoplastic elastomer, silicone rubber, and isoprene rubber.

A blood collection tube holder 7 is connected to the proximal end side of the blood collection needle 2 of the present invention by screwing a screw portion 46 of the blood collection needle 2 and an opening 71 of the blood collection tube holder 7. The blood collection tube holder 7, like the hub 4, is a hollow tube made of a transparent or opaque material, and has a tapered shape whose outer diameter increases toward the base end. Further, the blood collection tube holder 7 needs to have an inner diameter and a length capable of holding a vacuum blood collection tube (not shown) in its inner cavity. The needle tube 3 is inserted into the vacuum blood collection tube by inserting the rubber stopper provided at the mouth of the vacuum blood collection tube into the needle tube 3 until the cutting edge 32 is joined to the shoulder 72. 7
Inserted into and used.

A tab 73 extending toward the distal end of the blood collection needle 2 is provided outside the distal end of the blood collection tube holder 7, and a projection 74 is formed on the tab 73 on the blood collection needle 3 side.
A blood collection tube holder 7 is connected to the proximal end side of the needle tube 3.
After piercing the patient with the blade edge 31 at the tip of the tab 73, the tab 73 is pushed by a finger or the like from the outside and urged toward the blood collection needle 2 to be provided on the tab 73 as shown in FIG. The elastic member 6 provided on the blood collection needle 2 is
Push down inward. At this time, the ventilation hole 44 airtightly closed by the elastic member 6 is communicated with the external atmosphere by pushing down the elastic member 6, so that the needle tube 3, the elastic cap 5, the communication hole 43, and the ventilation hole The air inside 44 escapes to the outside and blood flows in from the blade edge 31. Flashback is confirmed by viewing the blood with the elastic cap 5 or the hub 4. FIG. 4 is a sectional view taken along line BB of the blood collection device 1 shown in FIG. The tab 73
The shape of the projection 74 is, as shown in FIG.
Of the elastic member 6 through the opening of the ventilation hole 44.
The shape is not particularly limited as long as the shape does not prevent the inward depression of the inward direction.

Further, a rib 48 as shown in FIGS. 1, 2 and 4 may be provided on the outer periphery of the distal end side of the hub 4. The rib 48 is used to engage with a needle cap (not shown) to prevent the blood collection needle 2 from rotating in the needle cap. FIG.
As shown in FIG. 4 and FIG. 4, the screw portion 46 of the blood collection needle 2 and the opening 71 of the blood collection tube holder 7 are incompletely screwed by interposing the opening of the ventilation hole 44 so that the tab 73 and the projection are not provided. Even if the 74 is shifted left and right from a predetermined position, the projection 74 is guided to the opening of the ventilation hole 44 by the rib 48 and the elastic member 6 can be pushed down.

Further, the blood collection device 1 of the present invention may use a blood collection needle 3 having a hole 33 on a side surface as shown in FIG. When the blood collection needle 3 having the hole 33 is used, the blood flowing into the needle tube 3 when confirming flashback passes through the hole 33 and the communication hole 43 and the ventilation hole earlier than flowing into the elastic cap 5. Since it flows into 44, flashback can be confirmed quickly.

[0018]

The blood collection device of the present invention does not require a conventional air-permeable blood-impermeable filter as a means for confirming flashback, so that the manufacturing cost is very low. In addition, since the blood collection needle is provided with an elastic member and the blood collection tube holder is provided with a tab and a projection, flashback can be confirmed, and there is no possibility that the shape becomes large.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a blood collection device of the present invention.

FIG. 2 is a sectional view taken along line AA of the blood collection device shown in FIG.

FIG. 3 is a cross-sectional view showing a state when flashback is confirmed in the blood collection device shown in FIG. 1;

FIG. 4 is a sectional view taken along line BB of the blood collection device shown in FIG. 3;

FIG. 5 is a cross-sectional view showing another embodiment of the blood collecting device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blood-collecting apparatus 2 Blood-collecting needle 3 Needle tube 31 and 32 Cutting edge 4 Hub 5 Elastic cap 6 Elastic member 7 Blood-collecting-vessel holder

Claims (2)

[Claims] 1. A needle tube having a sharp cutting edge at a distal end and a proximal end, a hub externally inserted at an intermediate portion of the needle tube, and a hermetically attached to a proximal end side of the hub and a proximal end of the needle tube. In a blood collection device including a blood collection needle having an elastic cap formed to house a cutting edge and a blood collection tube holder connected to a proximal end side of the blood collection needle, the hub communicates the inside of the elastic cap with an external atmosphere. An elastic member is provided at an external opening of the air hole, and the blood collection tube holder has a tab at a distal end thereof extending toward the distal end of the blood collection needle, and a projection provided on the tab. A blood collection device, wherein the interior of the blood collection needle is communicated with an external atmosphere by pushing down the elastic member into a vent hole. 2. The hub is formed of two members, a distal end portion and a proximal end portion, the distal end portion is fixed to a needle tube at a distal end side, and the base end portion has an elastic cap on the proximal end side. The blood collection device according to claim 1, wherein the blood collection device is attached, and the elastic member is fitted and fixed in the hub by the distal end portion and the proximal end portion.