JP2002325750A - Blood collection needle - Google Patents

Abstract

(57) [Problem] To provide a blood collection needle in which the filter is not damaged due to attachment / detachment of a blood collection tube or the like and flashback can be confirmed quickly and easily. SOLUTION: A transparent or translucent hub 2 having a hole penetrated in the axial direction, and a needle tube 3 inserted into the hole of the hub 2 and extending from a distal end side and a proximal end side of the hub 2 respectively.
An elastic cap connecting member 4 which is a hollow tube inserted into the space between the hub 2 and the needle tube 3 extending from the proximal end side of the hub 2 from the proximal end side; An elastic cap 5 attached to the end side and capable of accommodating the needle tube 3 and the cutting edge 331 extending from the base end side of the hub 2, and an elastic cap 5 formed by the needle tube 3, the hub 2 and the elastic cap connecting member 4. And a filter 7 provided in the ventilation path 6, and a needle 7 disposed in a hole of the hub 2. This is a blood collection needle 1 in which a notch 31 is formed.

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, so-called flashback.

[0002]

2. Description of the Related Art Conventionally, a blood collection needle has been proposed that allows a flashback to be confirmed before a vacuum blood collection tube is attached when blood is collected by a vacuum blood collection tube. 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 fitted to the hub so as to surround one end of the needle tube The hub is provided with a vent hole for communicating between the inside and the outside of the elastic cap, and an air permeable portion is provided at an outside opening of the vent hole provided at the tip of the hub. Blood collection needle provided with a blood impermeable filter (Japanese Patent Publication No. 7-3)
2766, JP-A-7-379, JP-A-8-
No. 150134). In order to confirm flashback, these blood collection needles allow air to escape to the outside so that blood flows into the blood collection needle when the blood collection needle is punctured into a vein of a subject, 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, the blood collection needle described in the above publication is
When the hub is formed, it is necessary to form a vent inside the hub. In order to reduce the size of the hub itself, it is preferable to form the vent hole as small as possible, so that the structure of the hub naturally becomes complicated and molding becomes difficult. Further, in these blood collection needles, since the filter is provided at the distal end of the hub, there is a possibility that confirmation of flashback cannot be performed easily and quickly because the filter is in the way. Further, the blood collection needle, the blood flowing into the blood collection needle when the blood collection needle punctured the vein of the subject,
Since flashback is confirmed only through the air hole in the hub after once filling the inside of the elastic cap, a certain period of time is required from puncturing the subject to flashback confirmation.

A blood collection needle in which the filter is fixed by fitting without fusing the filter has also been developed (Japanese Patent Publication No. 21809/1990, Japanese Patent No. 3086024).
Publication). The blood collection needle described in Japanese Patent Publication No. 22809/1990 has a first cannula and a second cannula, and blood is collected by fixing a member for fixing the first cannula and a member for fixing the second cannula. When forming the needle, a gap is formed in the fixing surface of the fixing member, and the filter is held in the gap. However, in this blood collection needle, when a vacuum blood collection tube is connected to the proximal end side of the blood collection needle, the negative pressure in the vacuum blood collection tube is directly applied to the filter, so that air may flow in from the outside through the filter. It may also reduce the blood collection volume of the vacuum blood collection tube. Patent No. 3
The blood collection needle described in Japanese Patent Application Laid-Open No. 0886024 has a plate-shaped air-permeable filter interposed in a gap between two members of a hub such that a flat surface has an angle of 70 to 110 degrees with respect to the hub axial direction. It is to let. Such a blood collection needle requires a certain strength of the filter and also requires an air chamber. As a result, the hub structure is complex and large, making it difficult for healthcare professionals to use.

On the other hand, a blood collection needle capable of easily and quickly confirming flashback without being disturbed by a filter has also been developed (JP-A-58-212455 and JP-A-4-141151). JP-A-58-212
The blood collection needle described in Japanese Patent No. 455 has a filter held at a mouth portion of a rubber sheath, and enables flashback to be confirmed by visually observing blood flowing into the transparent rubber sheath. However, in such a blood collection needle, a holder is provided on a rubber sheath, and further, it is held by hand from above, and it is very difficult to confirm flashback. Further, the filter fitted to the rubber sheath cannot withstand the expansion and contraction of the rubber sheath when attaching and detaching the blood collection tube, and blood may leak. In the blood collection needle described in Japanese Patent Application Laid-Open No. 4-141151, two needles are fixed to a transparent hub at an interval L, and flashback can be confirmed from the interval L via the hub. Things. However, in this blood collection needle, since a part of the soft cap surrounding one of the needles is formed of a filter member, the blood collection needle cannot withstand expansion and contraction of the rubber sheath when attaching and detaching the blood collection tube. May leak.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention enables quick and easy confirmation of flashback,
An object of the present invention is to provide a blood collection needle which does not cause a decrease in the blood collection volume of a vacuum blood collection tube, has a simple hub structure, and is easy to form and manufacture.

[0007]

The inventor of the present invention has made various studies to solve the above-mentioned problems, and as a result, assembling a hub, an elastic cap connecting member and an elastic cap, and forming a ventilation passage through a gap between the members. It has been found that the desired object can be achieved by forming the filter, fitting and fixing the filter in the ventilation path, and further providing a notch in the blood collection needle, and reached the present invention.

That is, the present invention provides a transparent or translucent hub having a communication hole penetrated in the axial direction, and a hub inserted into the communication hole of the hub and extending from the distal end side and the proximal end side in the axial direction of the hub, respectively. Cap connecting member which is a hollow tube inserted into the space between the hub and the needle tube extending from the base end side of the hub from the base end side, and the elastic cap connecting member. An elastic cap that is hermetically attached to the proximal end of the housing and that can accommodate a needle tube extending from the proximal end of the hub and a cutting edge thereof, and a filter inside the elastic cap formed by the needle tube, the hub, and the elastic cap connecting member. An air passage for communicating with an external atmosphere through the air passage, and an air-permeable and blood-impermeable filter provided in the air passage, and at least a part of the needle tube disposed in the communication hole is missing. Parts is a blood collection needle is formed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a blood collection needle of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings, but the present invention is not limited to these descriptions. FIG.
Is a longitudinal sectional view showing an embodiment of the blood collection needle of the present invention,
2, 3 and 4 are longitudinal sectional views showing another embodiment of the blood collection needle of the present invention. In the blood collection needle 1 of the present invention, the distal end refers to the side that punctures the patient (the left side in the figure), and the proximal end refers to the side that punctures the vacuum blood collection tube (not shown) (the right side in the figure).

The blood collection needle 1 of the present invention has a substantially cylindrical transparent or translucent hub 2. The hub 2 is formed into a hollow tube by injection molding or the like, and has a communication hole 21 penetrated in the axial direction.
And an insertion hole 22. The communication hole 21
Is provided on the distal end side of the hub 2 and is for inserting and fixing the needle tube 3. The inner diameter is slightly larger than the outer diameter of the needle tube 3. In addition, an insertion hole 2 having an inner diameter larger than the distal end portion is provided at the base end side of the communication hole 21.
The insertion hole 22 is for inserting and fixing the needle tube 3 and the elastic cap connecting member 4. The filter 7 may be inserted into the insertion hole 22 in addition to the needle tube 3 and the elastic cap connecting member 4 as described later. A rib 23 may be provided on the outer periphery of the distal end portion of the hub 2. The rib 23 is engaged with a needle cap (not shown) for protecting the needle tip on the side where the patient punctures, and is used for preventing the blood collection needle 1 from rotating in the needle cap. Is done. A screw portion 24 is provided on the outer periphery of the base end portion of the hub 2, and a mouth portion of a holder (not shown) for holding a vacuum blood collection tube can be screwed into the screw portion 24. It has become. The hub 2
Is preferably formed of a transparent or translucent material in order to easily confirm flashback. The hub 2
Specifically, specifically, polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polymethylpentene, polycarbonate, polyacrylonitrile, A
It is formed from a BS resin or the like.

A communication hole 2 provided at the tip end of the hub 2
A needle tube 3 is inserted into and fixed to 1 so as to extend from the distal end side and the proximal end side of the hub 2, respectively. The needle tube 3 in the present invention is a hollow tube, and the needle tube 3 is
A cutout portion is formed in at least a part of the communication hole 21. When one end of the needle tube 3 is punctured into a vein of a patient, the cut-off portion 31 visually confirms the blood flowing into the needle tube 3 from the outside through the cut-out portion 31 via the hub 2 to confirm flashback. It is for doing. The cutout portion 31 may be formed by forming a hole in a part of the needle tube, or may be formed by partially breaking the needle tube. Specifically, as shown in FIG. 1, a needle tube 3 composed of two members, a distal needle tube 32 extending from the distal end of the hub 2 and a proximal needle tube 33 extending from the proximal end of the hub 2. And
As shown in FIG. 2, a needle tube 3 having a sharp cutting edge at both ends and having a side hole 31 and made of a single member is exemplified.
In FIG. 1, the distal needle tube 32 has a sharp cutting edge 321 at the distal end for puncturing a patient, and the proximal needle tube 33 has a proximal end for puncturing a vacuum blood collection tube. It has a sharp cutting edge 331. The needle tube 3 is hermetically fixed to the hub 2 using, for example, an adhesive S. As the adhesive S, an epoxy curing agent, a UV curing adhesive, or the like is used. The adhesive S may be used to fill a part of the gap between the hub 2 and the needle tube 3. In addition, the needle tube 3 does not use the adhesive S, and is fused by ultrasonic waves or high-frequency waves, so that the hub 2
May be fixed. When the needle tube 3 is composed of two members, each needle tube needs to be fixed to the hub 2.
Examples of the material of the needle tube 3 include metal materials such as stainless steel, aluminum, titanium, and alloys thereof.

An insertion hole 2 provided on the base end side of the hub 2
2, the elastic cap connecting member 4 is inserted from the base end side of the insertion hole 22. The elastic cap connecting member 4 is a hollow tube having an inner diameter larger than an outer diameter of the needle tube 3 so that the needle tube 3 can be inserted. At the base end of the elastic cap connecting member 4, a step portion 41 having a larger outer diameter on the base end side is formed, so that an opening of the elastic cap 5, which will be described later, is airtight and cannot be detached. To lock. The step portion 41 has a difference in diameter between a portion having a small outer diameter on the distal side and a portion having a large outer diameter on the proximal side of 0.6 to 1.4 mm.
It is preferred that A shoulder 42 having a smaller outer diameter at the distal end may be provided on the distal end of the elastic cap connecting member 4 beyond the step 41 in order to fix a filter 7 described below at a predetermined location. Further, the base end side of the elastic cap connecting member 4 from the step portion 41 may be formed in a tapered shape whose outer diameter decreases toward the base end side so that the elastic cap can be easily attached.

The elastic cap 5 engaged with the step portion 41 of the elastic cap connecting member 4 has a cylindrical shape with a bottom, and can store the cutting edge 331 on the proximal end side of the needle tube 3. Is formed to have a gap 51 through which blood can pass. The inner diameter of the elastic cap 5 is preferably larger than the outer diameter of the needle tube 3 by 0.1 to 1.0 mm. Examples of the material of the elastic cap 5 include natural rubber, synthetic rubber such as isoprene rubber and silicon rubber, and elastomer.
Those having rubber elasticity can be mentioned.

At the base end of the hub 2, the needle tube 3 and the elastic cap connecting member 4 are inserted into the insertion hole 22 of the hub 2 from the base end side. A ventilation path 6 is formed to allow the inside of 5 to communicate with the outside atmosphere via a filter 7. As shown in FIG. 1, for example, the ventilation path 6 includes an elastic cap connecting member 4 and a needle tube 3.
, A gap 62 between the needle tube 3 and the hub 2, a gap 63 between the hub 2 and the elastic cap connecting member 4, and a gap 64 between the hub 2 and the elastic cap 5. Accordingly, the blood collection needle 1 of the present invention does not require a hole in the hub 2 to form a ventilation path to allow the inside of the elastic cap 5 to communicate with the outside atmosphere via the filter 7, and is easy to manufacture. Further, since the ventilation path 6 communicates with the external atmosphere through a gap 64 between the hub 2 and the elastic cap 5, an external opening 65 of the ventilation path 6, which is an outer end of the gap 64, is connected to the hub. The second screw portion 24 is formed on the base end side. As shown in FIG. 3, the air passage 6 has a hole 6 penetrated in a direction perpendicular to the axial direction of the elastic cap connecting member 4.
6 may be used. In this case, the inside of the elastic cap 5 communicates with the external atmosphere through the gap 61 between the elastic cap connecting member 4 and the needle tube 3, the hole 66 and the gap 64 between the hub 2 and the elastic cap 5. Therefore,
A gap 62 between the hub 2 and the needle tube 3 as in the ventilation path shown in FIG.
Further, it is not necessary to form the gap 63 between the hub 2 and the elastic cap connecting member 4. That is, the hub 2 and the elastic cap connecting member 4 are fitted in the insertion hole 22 in a liquid-tight manner. The elastic cap connecting member 4 in the gap forming the ventilation path 6
The gap 61 between the needle tube 3 and the needle tube 3 may be provided on the entire outer periphery of the needle tube 3, or may be provided on at least a part of the outer periphery, for example, provided at two locations above and below the needle tube 3. Also, the gap 63 between the hub 2 and the elastic cap connecting member 4 may be provided on the entire outer periphery similarly to the gap 61,
It may be provided on at least a part of the outer periphery. The gaps 61, 62, 63 and 64 forming the ventilation path 6 are:
The size and shape are not particularly limited as long as air and blood can be pushed and passed by venous pressure, but the cross-sectional area of the gap is preferably 0.01 to 10 mm ² .
Further, the gap may have a large cross-sectional area only at a portion where the air-permeable blood-impermeable filter 7 is fixed. The cross-sectional shape of the outer opening 65 of the ventilation passage 6 is preferably circular, and the inner diameter thereof is 2 to 4
mm is preferred. Since the air passage 6 in the blood collection needle 1 of the present invention is not for confirming flashback but for communicating the inside of the elastic cap 5 with the external atmosphere, the entire length may be formed as short as possible. preferable.

In the ventilation passage 6, a cylindrical air-permeable and blood-impermeable filter 7 is provided so as to block communication with the atmosphere outside the ventilation passage 6. The filter 7
When the blood collection needle 1 has the ventilation path 6 shown in FIG.
It is preferable to be arranged in the gap 63 between the hub 2 and the elastic cap connecting member 4. The outer diameter of the filter 7 is formed slightly larger than the inner diameter of the insertion hole 22 of the hub 2, and the inner diameter is formed slightly smaller than the outer diameter of the elastic cap connecting member 4. Therefore, by disposing the filter 7 in the gap 63, the filter 7 is securely fitted and fixed by the hub 2 and the elastic cap connecting member 4. Thus, the filter 7 of the present invention allows the air in the ventilation path 6 to pass to the outside, but does not leak blood to the outside, and maintains the liquid tightness in the ventilation path 6. The filter 7
May be arranged not only in the gap 63 between the hub 2 and the elastic cap connecting member 4 but also in the gap 64 between the hub 2 and the elastic cap 5. The filter 7 needs to be provided on the proximal end side of the hub 2 as much as possible so as not to hinder confirmation of flashback in the cutout 31 of the needle tube 3.
And at the outer end 65 of the ventilation path 6 at the base end side, preferably at the base end side of the screw part 24. When the elastic cap connecting member 4 is provided with the shoulder 42 described above, the inner diameter of the filter 7 is formed to be slightly smaller than the outer diameter of the elastic cap connecting member 4 on the distal end side of the shoulder 42. Is preferred. As a result, the elastic cap connecting member 4 may move from the predetermined position to the distal end side of the filter 7, and the cutting edge 331 on the proximal end side of the needle tube 3 may protrude from the elastic cap 5 fixed to the elastic cap connecting member 4. Absent. The hub 2 and the elastic cap connecting member 4
The filter 7 is fixed by fitting the hub 2 and the filter 7 and the elastic cap connecting member 4 and the filter 7 to each other. To more reliably fix these members, an axially extending rib may be provided inside the insertion hole 22 of the hub 2 to directly fix the hub 2 and the elastic cap connecting member 4. Further, the hub 2 and the elastic cap connecting member 4 may be fixed by fusion or adhesion to such an extent that the ventilation path 6 is not blocked. On the other hand, when the blood collection needle 1 has the ventilation path 6 shown in FIG. 3, the filter 7 is disposed in the gap 64 between the hub 2 and the elastic cap 5 so as to close the hole 66 provided in the elastic cap connecting member 4. Is preferably performed. The filter 7
Is formed to be slightly smaller than the outer diameter of the elastic cap connecting member 4. The filter 7 is tightly fitted or fused to the elastic cap connecting member 44 so as to close the hole 66 of the elastic cap connecting member 4, so that the air in the ventilation path 6 passes to the outside. However, blood does not leak to the outside, and the liquid tightness in the air passage 6 is maintained. The filter 7 is not particularly limited as long as it has pores that allow gas to pass therethrough and does not allow liquid to pass therethrough, such as a membrane filter or a sintered filter, but preferably polyethylene, polypropylene, polymethyl methacrylate,
It is a sintered body made of polystyrene or the like, and more preferably contains a water-absorbing polymer that swells when it comes into contact with blood and closes the pores of the sintered body. Examples of the water-absorbing polymer include starch and acrylate, and the content thereof is preferably 1 to 30% based on the total weight of the sintered filter.

The blood collection needle 1 of the present invention has a threaded portion 24 of the hub 2.
In a state where a holder (not shown) is screwed into the needle, the cutting edge 321 at the tip of the needle tube 3 is used by puncturing a vein of a patient. At this time, the air in the needle tube 3 passes through the elastic cap 5, escapes to the outside through the ventilation path 6, and blood flows into the needle tube 3. After filling the gap 51 in the elastic cap 5, the blood flows into the air passage 6 and is blocked by the air-permeable blood-impermeable filter 7. The blood collection needle 1 can confirm flashback by visually checking the blood flowing into the needle tube 3 by such a mechanism from the outside at the cutout 31 of the needle tube 3 via the hub 2. Therefore, the blood collection needle 1 of the present invention can be used as a conventional blood collection needle for visually checking the blood flowing into the elastic cap to confirm flashback, or for a ventilation path for communicating the inside of the elastic cap with the external atmosphere. The time required for flashback confirmation can be greatly reduced, and the burden on the patient can be reduced, as compared with the case where flashback is confirmed by visually checking the inflowing blood. Further, as shown in FIG. 4, the communication hole 21 of the hub 2 near the notch 31 may be formed to have a large inner diameter so that flashback at the notch 31 can be easily confirmed. Thereby, the blood that has flowed into the needle tube 3 overflows from the cutout portion 31 to the communication hole 21, so that it is easier to confirm flashback via the hub. Thus, the communication hole 2
In order to increase the diameter of a part of the hub 1, the hub 2 may be formed of two members if necessary for molding. After confirming the flashback, a vacuum blood collection tube (not shown) is inserted into the holder, and the cutting edge 331 on the proximal end side of the needle tube 3 punctures a rubber stopper provided at the mouth of the vacuum blood collection tube. By being inserted into the vacuum blood collection tube, blood flows into the vacuum blood collection tube and blood is collected.

[0017]

According to the blood collection needle of the present invention, the flashback is confirmed by visually observing the blood from the outside via the hub at the cutout provided in the needle tube. The time required for flashback confirmation can be greatly reduced. Further, the blood collection needle is formed when the hub, the elastic cap connecting member and the elastic cap are assembled, and the gap between the respective members is used as an air passage, so there is no need to form an air passage inside the hub itself, Its structure is simple, and it is easy to mold and manufacture. Further, in the blood collection needle of the present invention having the above structure, when a vacuum blood collection tube is connected to the base end side of the blood collection needle, negative pressure in the vacuum blood collection tube is not directly applied to the filter. There is no danger of inflow, and there is no danger that the blood collection volume of the vacuum blood collection tube will decrease. Furthermore, since an air-permeable blood-impermeable filter is provided on the proximal end side of the hub, when checking the blood that has flowed back into the ventilation path through the hub at the cut-off portion of the needle tube, the filter is not used. However, there is no danger of getting in the way of confirmation. Furthermore, the blood collection needle of the present invention fixes the filter to the air passage by fitting, and unless the air and blood leak in the filter portion, the material and shape, the arrangement angle and the like are specially set. There is no need to limit, and manufacture is easy.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing another embodiment of the blood collection needle of the present invention.

FIG. 3 is a longitudinal sectional view showing another embodiment of the blood collection needle of the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the blood collection needle of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 blood collection needle 2 hub 3 needle tube 31 notch 321, 331 cutting edge 4 elastic cap connecting member 5 elastic cap 6 air passage 61, 62, 63, 64 gap 7 filter

Claims (7)

[Claims] 1. A transparent or translucent hub having a hole penetrated in the axial direction, and a sharp cutting edge inserted into the hole of the hub and extending from the distal end side and the proximal end side of the hub in the axial direction, respectively. A resilient cap connecting member that is a hollow tube inserted from the base end side into a space between the needle tube having the hub and the needle tube extending from the base end side of the hub; and a base end side of the elastic cap connecting member. An elastic cap that is hermetically attached and that can accommodate a needle tube extending from the base end side of the hub and its cutting edge, and an inside of an elastic cap formed by the needle tube, the hub, and the elastic cap connecting member through an external atmosphere through a filter. A cut-off portion is formed in at least a part of the needle tube disposed in the hole of the hub, comprising a ventilation path for communicating with the air passage, and an air-permeable blood-impermeable filter provided in the ventilation path. Blood sampling needle. 2. The needle tube comprises two needle tubes having a sharp cutting edge at one end, and a needle tube extending from the distal end of the hub is inserted into a hole of the hub with the sharp cutting edge directed toward the distal end,
The needle tube extending from the proximal end of the hub is inserted into the hole of the hub with a sharp cutting edge facing the proximal end, and the two needle tubes are fixed at an interval to form a cutout. The blood collection needle according to claim 1, wherein 3. The needle tube comprises a single needle tube having sharp cutting edges at both ends, and a cutout portion is formed by providing a hole in a part of a side surface of the needle tube disposed in a hole of the hub. The blood collection needle according to claim 1. 4. The air passage comprises a gap between the elastic cap connecting member and the needle tube, a gap between the needle tube and the hub, a gap between the hub and the elastic cap connecting member, and a gap between the hub and the elastic cap. The blood collection needle according to any one of claims 1 to 3, wherein the blood collection needle communicates with an external atmosphere via a gap with the elastic cap. 5. The blood collection needle according to claim 4, wherein the air-permeable blood-impermeable filter is provided from a gap between the hub and the elastic cap connecting member to a gap between the hub and the elastic cap. 6. The elastic cap connecting member is provided with a hole penetrated in a direction perpendicular to the axial direction, and the ventilation path is provided in a gap between the elastic cap connecting member and the needle tube, and in the elastic cap connecting member. The blood collection needle according to any one of claims 1 to 3, comprising a hole provided and a gap between the hub and the elastic cap, and communicating with an external atmosphere through the gap between the hub and the elastic cap. 7. The blood collection needle according to claim 6, wherein the air-permeable blood-impermeable filter is provided in a gap between the hub and the elastic cap so as to close a hole provided in the elastic cap connection member.