JPH07328116A - Medical puncture needle - Google Patents

Abstract

PURPOSE:To safely discard an inner needle of an indwelling needle used and an injection needle of an injector without being afraid of possible secondary infection. CONSTITUTION:A stretchable needle case body 21 is fitted into a base end part of a needle body 2 as an inner needle or injection needle being shrunk and the base end thereof is fastened at the tip of a needle base 4. As the needle case body 21 is stretched to wrap the whole of the needle body, telescope- structured short cylinder bodies 22a... and 22f are made unable to shrink with an outward protruded rim 23 at the tail end thereof bumping an inward protruded rim 25 thereby keeping the needle case body stretched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puncture needle for indwelling or injection for percutaneously puncturing a blood vessel, a bile duct or the like for medical treatment, and more specifically, without exposing a metal inner needle or injection needle after use. The present invention relates to a medical puncture needle having a mechanism that can be discarded.

[0002]

2. Description of the Related Art Indwelling needles for transfusion, infusion or blood removal, and drainage placed in blood vessels or bile ducts are composed of a flexible thin tube cannula and a metal inner needle for percutaneously piercing the cannula. When the target site is reached, the inner needle is pulled out and the cannula is left.

The inner needle taken out from such an indwelling needle or the needle after use in a syringe is made disposable so as to prevent bacteria and viruses adhering to the inner needle from infecting the next subject. It is usually discarded. In this case, when a doctor or a nurse accidentally injures a finger or the like when pulling out the inner needle from the cannula or separating the injection needle from the syringe barrel, or when putting them in a synthetic resin bag of a flexible film and discarding them. There is concern that the collectors may hurt their fingers and infect people involved.

Therefore, in the case of a syringe, the lid body is provided with means for separating the injection needle by hooking the needle base of the injection needle and pulling the injection cylinder so that the separated injection needle can be dropped and stored in the container body as it is. Has been proposed (JP-A-1-52480 and JP-A-1-136).
665 publication). That is, by using this waste container, the injection needle can be separated without touching the hand,
Moreover, since the contained injection needle does not break through the container body, it is said that the safety of persons concerned can be expected.

However, from the end of use to the separation and storage in a waste container, there is no chance of the adhered blood touching or injuring fingers, and the risk of infection still remains. Also, for the indwelling needles described above, the inner needle must be pulled out of the cannula and handled by gripping the needle base until it is placed in the prepared container for disposal. There are many opportunities to do

[0006]

The problem to be solved by the present invention is that the inner needle of the indwelling needle and the injection needle of the syringe are exposed from the human body until they are stored in a waste container or the like. Although there is a concern that the adhered blood will be touched or the finger or the like will be injured because it will be handled in Japan, sufficient safety measures have not been taken.

[0007]

The present invention solves the above problems and provides a medical puncture needle having a function of treating a used inner needle and an injection needle without touching them at all. That is the purpose.

That is, as a means therefor, a needle case body which is capable of extending the entire length of the needle body or longer than the needle body is fixed to the distal end of the needle base and is fitted to the base end portion of the needle body in a contracted state. In addition, the needle case body is provided with shrinkage preventing means for holding the stretched state when the needle case body is stretched.

The needle case body has a telescope structure composed of several short cylinders or a bellows structure.

When the needle case body has a telescopic structure, the contraction preventing means has an outwardly projecting edge at the tail end of the front short tubular body,
It may be constituted by an inward projection that acts as a detent against the outward protruding edge formed slightly rearward from the tip of the rear short tubular body that has an inward protruding edge at the tip that engages with this and acts as a retainer. . Alternatively, regardless of whether the needle case body has a telescope structure or a bellows structure, the elastic packing that is attached to the distal end portion of the needle case body in close contact with the outer peripheral surface of the needle body in a compressed state, and the tip of the needle body There may be a case where it is constituted by an annular groove for fitting and locking the elastic packing formed in the portion or a taper outer peripheral surface portion formed in at least the tip portion of the needle body and having a large diameter toward the tip.

[0011]

[Operation] While the needle case body is kept contracted and the punctured needle body is pulled out from the human body, or after the needle body is pulled out, the needle case body is extended, and the needle body is wrapped in the entire length by the shrinkage preventing means. Let it be discarded. As a result, it is possible to carry out the treatment without worrying that the adhered blood may come into contact with doctors, nurses, and recovery companies, or the fingers may be injured.

[0012]

Embodiment 1 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a puncture needle configured by applying an outer case body having a telescopic structure to an indwelling needle. Reference numeral 1 denotes an inner needle 2 having a puncture blade 3 at the tip and constituting the needle body of the present invention, and a needle base 4 made of a hard synthetic resin having its base end embedded and fixed at the tip, and the cannula body 6 is an inner needle. A cannula 7 made of a thin tube of soft synthetic resin, which is fitted into the blood vessel 2, a bile duct, etc., and which is fitted tightly to 2 and a fitting part 8 having a thick wall and a large diameter at its base end is detachably fitted. The base body 9 is made of a hard synthetic resin having a tip 10 and the base body 9 is internally provided with a valve piece 11 made of a highly elastic material such as silicon rubber. The valve piece 11 encloses the inner needle 2 and is in close contact with the outer peripheral surface thereof, but when the inner needle 2 is removed, its insertion hole is closed by its own elastic force, which prevents blood from flowing out. It is commonly used to prevent.

The needle case body 21 has a plurality of short cylinders 22 made of a hard synthetic resin having an outward projecting edge 23 at the tail end and an inward projecting edge 24 at the tip except the frontmost one.
a, 22b, 22c, 22d, 22e, 22f, and the outward protruding edge 2 of the shortest tubular body 22a having the largest diameter at the rearmost side.
3 is fixed to the tip surface of the needle base 4 by an adhesive or heat welding. Then, the short cylindrical body 22 is gradually reduced in diameter.
a, 22b, 22c, 22d, 22e, 22f are fitted to the proximal end portion of the inner needle 2 in a contracted state in which they are fitted to each other, and the tip of the shortest tubular member 22f having the smallest diameter at the forefront is the cannula body 6. It is fixed to the tail end of the base body 9 with an adhesive or by heat welding.

Therefore, in this embodiment, the base body 9 of the cannula body 6 is a component of the needle case body 21, and the puncture blade 3 of the inner needle 2 is located inside the base body 9 when extended. There is.

A short cylindrical body 22 which is the frontmost of the needle case body 21
All the short cylinders 22a, 22b, 22c, 22 except f
d and 22e are formed with an inward projection 25 formed by a groove which is located slightly rearward from the tip end and is provided discontinuously in the circumferential direction. The inward projection 25 and the short tubular body in front of the inward projection 25 are formed. The outward protruding edge 23 constitutes a contraction preventing means which cooperates with each other to function as a detent.

In the present embodiment having such a structure, the puncture blade 3 is exposed to the front and the cannula 7 is fitted to the inner needle 2, so that the needle case body 21 is contracted, as shown in FIG. In the state shown, a target site, for example, a blood vessel is punctured.

Next, the cannula 7 is used for blood transfusion.
The inner needle 2 is pulled out while leaving the needle punctured in the blood vessel. This withdrawal is carried out by the same method as in the conventional method of pulling the needle base 4, and the needle case body 21 whose front end is fixed to the base body 9 and whose rearmost end is fixed to the needle base 4 is a short cylinder 22b, 22c, 2
By sequentially withdrawing 2d, 22e, and 22f, the inner needle 2 is always wrapped and extended in the state shown in FIG. 1 (B).

When the needle case body 21 is completely extended, the inner needle 2 is withdrawn from the cannula 7 and the puncture blade 3 is positioned inside the base body 21. Therefore, when the cannula 7 is set in place and the needle base 4 or the base body 9 is held and further pulled, the joint tube portion 10 is pulled out from the attachment portion 8 and the cannula body 6 is separated, as shown in FIG. The inner case 2 can be discarded while the inner case 2 is completely wrapped by the needle case body 21 having the base body 9 as a component.

In this embodiment, the short cylinders 22a, 22b, 2
2c, 22d, 22e, and 22f of the tail end outward protruding edge 23
As shown in the enlarged portion of (C) of FIG. 1, since it is a tilted needle protrusion edge that spreads backward in a trumpet shape, if it collides with the inward protrusion 25 when it is extended, it elastically contracts and passes. However, when it tries to return to the contracting direction, if it collides with the inward projection 25, a force in the direction of further spreading acts and it becomes impossible to pass through it. For this reason, the short cylinders 22b, 22c, 22d, 22e, 22f are rear short cylinders. The body 22a, 22b, 22c, 22d, 22e has a rattling that expands and contracts in the longitudinal direction by a length corresponding to the distance between the inwardly projecting edge 24 and the protrusion 25.

Further, since the inward protruding edge 24 at the tip is a tilted needle protruding edge that is gradually narrowed forward, it does not come out even if it makes surface contact with the outward protruding edge 23 and is extended with a strong force.

[0021]

[Embodiment 2] FIG. 2 shows an example of a puncture needle configured by applying an outer case body having a bellows structure to an injection needle of a syringe, and has a puncture blade 33 at the tip to constitute the needle body of the present invention. Injection needle 3
No. 2 is embedded and fixed at the tip of a needle base 34 made of a hard synthetic resin, the base end of which is connected to the tip of the injection cylinder.

The needle case body 41 is composed of a bellows body 42 made of a soft synthetic resin, and a pipe-shaped cover body 43 which is integrally formed at the tip thereof or formed separately from the bellows body 42 by an adhesive or heat welding to project. An elastic packing 44 made of a highly elastic material such as silicon rubber is provided near the base end of the cover body 43.

Then, the bellows body 42 of the needle case body 41
Is made to shrink when left standing, and is fitted to the base end portion of the injection needle 32 in that state, and the base end of the bellows body 42 is adhered to the distal end surface of the needle base 34 with an adhesive or by heat welding. It is fixed by. The puncture blade 33 is positioned inside the cover body 43 when the bellows body 42 is extended.

An annular groove 35 is provided at the tip portion of the injection needle 32 near the puncture blade 33, and the annular groove 35 works to prevent the bellows body 42 from contracting by inserting and locking the elastic packing 44. Therefore, the annular groove 35 and the elastic packing 4
The numeral 4 constitutes a means for preventing the needle case body 41 from contracting.

The present embodiment having such a structure is used in the state shown in FIG. 2A in which the needle case body 41 is contracted, and the elastic packing 44 wraps the injection needle 32 and wraps it. It is in close contact with the outer peripheral surface with pressure contact. For this reason,
The elastic packing 44 acts as a brake that prevents the bellows body 42 from being inadvertently extended.

When the injection needle 32 is removed from the human body after the injection is completed, or while the injection needle 32 is removed from the human body, the cover body 43 overcomes the braking force of the elastic packing 44 and is pulled in the distal direction so that the bellows body 42 causes the injection needle 32 to reach the distal end. It gradually wraps up and grows. Then, when fully extended, the elastic packing 44 is fitted and locked in the annular groove 35 as shown in FIG.
Keeps the stretched state without contracting and restoring, and the cover body 4
By projecting 3 to the front of the puncture blade 33, the needle case body 41 can be discarded while completely enclosing the injection needle 32.

According to this embodiment, the needle case body 41 maintains the extended state without rattling due to the engagement between the annular groove 35 and the elastic packing 44.

FIG. 3 shows a different embodiment of the shrinkage prevention means provided on the needle body side for holding the outer case body 41 having a bellows structure in cooperation with the elastic packing 44 in an extended state. Has a tapered shape with a large diameter toward the tip over almost the entire length, and the elastic packing 44 pressed against the tapered outer peripheral surface portion 52 is gradually compressed as the tip moves to increase the frictional force. Is.

However, the shrinkage prevention function has a needle case body 41.
Should work when the needle 51 is completely wrapped,
The tapered outer peripheral surface portion 52 may be formed only on the tip portion of the injection needle 51.

Needless to say, the needle case body 21 having a telescopic structure can be applied to the injection needle 32, and the needle case body 41 having a bellows structure can be applied to the indwelling needle 1. Of course, the needle bases 4, 34, the short cylinder 22a or the bellows body 42, the base body 9 or the cover body 43 may be fixed to each other by mechanical means such as screw connection or luer connection.

[0031]

As described above, according to the present invention, the needle case body is fitted to the proximal end portion of the needle body in a contracted state, and means for preventing the contraction when the needle case body is extended to wrap the entire length of the needle body. According to this, both the inner needle of the indwelling needle and the injection needle of the syringe can be completely wrapped and discarded without being touched at all. Therefore, the concern that the adhered blood touches or injures a finger or the like to persons such as doctors, nurses, and collection companies is completely eliminated, and the treatment can be performed without the risk of secondary infection.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is a partial view showing a modification of the second embodiment.

[Explanation of symbols]

2 inner needles, 4 needle bases, 21, 41 needle case body,
22a, 22b, 22c, 22d, 22e, 22f Short tubular body, 23 Outward protruding edge, 24 Inward protruding edge, 2
5 inward projections, 32 injection needles, 34 needle bases, 3
5 annular groove, 42 bellows, 44 elastic packing,

Claims (6)

[Claims] 1. A needle case body, which is capable of extending the entire length of the needle body or longer than the needle body, is fixed to the base end portion of the needle body in a contracted state with its base end fixed to the tip of the needle base. A puncture needle for medical use, further comprising shrinkage prevention means for holding the stretched state when the needle case body is stretched. 2. The medical puncture needle according to claim 1, wherein the needle case body has a telescope structure composed of several short cylinders. 3. The medical puncture needle according to claim 1, wherein the needle case body has a bellows structure. 4. The needle case body has a telescope structure composed of several short cylinders, and the contraction preventing means engages with an outwardly projecting edge of the tail end of the front short cylinder and engages therewith as a retainer. The medical puncture needle according to claim 1, wherein the medical puncture needle comprises an inward projection that is formed slightly rearward from the tip of a rear short tubular body having an inward projection edge at its tip and that serves as a detent for the outward projection edge. 5. An elastic packing that is attached to the tip of the needle case body and has shrinkage prevention means that is in close contact with the outer peripheral surface of the needle body in a compressed state, and an elastic packing that is formed at the tip of the needle body and is fitted and locked. The medical puncture needle according to claim 1, wherein the medical puncture needle comprises a circular groove. 6. An elastic packing which is attached to the distal end of the needle case body and is in close contact with the outer peripheral surface of the needle body in a compressed state, and a shrinking prevention means which extends toward the distal end formed at least at the distal end portion of the needle body. The medical puncture needle according to claim 1, wherein the medical puncture needle has a taper outer peripheral surface portion having a diameter.