JP3400550B2 - Medical puncture needle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indwelling or injection puncture needle for percutaneously puncturing a blood vessel, a bile duct, or the like for medical treatment. The present invention relates to a medical puncture needle having a mechanism capable of discarding an inner needle or an injection needle without exposing it. 2. Description of the Related Art An indwelling needle which indwells in a blood vessel, a bile duct, or the like to perform blood transfusion, infusion or blood removal, and drainage is made of a cannula made of a flexible thin tube and a metal needle which percutaneously punctures the cannula. The inner needle is pulled out when the needle reaches the target site, and the cannula is left. [0003] The inner needle removed from such an indwelling needle or the used needle in a syringe is disposable in order to prevent bacteria, viruses and the like adhering thereto from infecting the next patient. It is common to discard. In this case, when a doctor or nurse removes the inner needle from the cannula or when the injection needle is separated from the syringe, it may inadvertently injure a finger or the like, or throw them into a synthetic resin bag of flexible film and discard them. There is a concern that stakeholders will be infected by the injuries caused by the collection company. [0004] Therefore, a means for separating the injection needle by hooking the needle base of the injection needle and pulling the injection cylinder is provided on the lid so that the separated injection needle is dropped and stored in the container as it is. A rigid waste container has been proposed (JP-A-1-52480, JP-A-1-136).
No. 665). That is, if this waste container is used, the injection needle can be separated without touching the hand,
Further, it is said that the accommodated injection needle does not break through the container body, so that safety of persons involved can be ensured. [0005] However, from the end of use to the time when the container is separated and stored in a waste container, there is no chance that the adhered blood touches or damages a finger or the like, and there is still a risk of infection. In addition, as for the above-mentioned indwelling needle, the inner needle must be removed from the cannula, and the needle base must be gripped until it is put into the container prepared for disposal, so that the attached blood may touch or accidentally injure your finger etc. There are many opportunities to do it. [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 removed from the human body until they are stored in a waste container or the like. However, despite the fact that the blood is handled in an exposed state, there is a concern that the blood may be touched or a finger may be damaged, but sufficient safety measures have not been taken. [0007] The present invention solves the above-mentioned problems, and a medical puncture needle having a function capable of processing a used inner needle and an injection needle without touching it at all. The purpose is to provide. That is, as means for this purpose, a needle case body which can be extended to the entire length of the needle body or longer than that is fixed with its base end to the tip of the needle base and fitted in a contracted state to the base end of the needle body. In a medical puncture needle which is mounted and provided with a contraction preventing means for maintaining an extended state when the needle case body is extended , the contraction preventing means comprises a tip of the needle case body.
It is attached to the end and is in close contact with the outer peripheral surface of the needle body by pressing.
Elastic packing, formed at the tip of the needle body,
An annular groove for fitting and locking the elastic packing; and
did. The needle case body is stretched while the needle case body is held in a contracted state and the punctured needle body is withdrawn from the human body, or the needle case body is extended after the needle body is withdrawn. Is kept wrapped over the entire length and discarded. As a result, the treatment can be performed without the fear that the adhered blood touches a doctor, a nurse, a collection company, or the like or damages a finger or the like. Embodiment 1 Referring to the drawings, an embodiment of the present invention will be described. FIG. 1 shows an example of a puncture needle constituted by applying an outer case body having a telescope structure to an indwelling needle. The inner needle body 1 has a puncture blade 3 at the distal end, and comprises an inner needle 2 constituting the needle body of the present invention and a needle base 4 made of a hard synthetic resin having a proximal end embedded and fixed at the distal end, and a cannula body 6. The cannula 7 made of a thin tube made of a soft synthetic resin to be placed in a blood vessel, a bile duct, or the like, which is fitted in the inner needle 2 without any gap, and the thick large-diameter attachment portion 8 at the base end thereof are detachably fitted. The base 9 is made of a hard synthetic resin and has a joint tube 10 at its tip. The base 9 has a valve piece 11 made of a highly elastic material such as silicone rubber. The valve piece 11 wraps the inner needle 2 and is in close contact with the outer peripheral surface thereof. However, when the inner needle 2 is removed, the insertion hole is closed by its own elastic force, and the outflow of blood is prevented. It is commonly used to prevent this. The needle case body 21 has several short cylindrical bodies 22 made of hard synthetic resin having an outwardly projecting edge 23 at the tail end and an inwardly projecting edge 24 at the tip except for the foremost one.
a, 22b, 22c, 22d, 22e, 22f, and the outwardly projecting edge 2 of the shortest cylinder 22a having the largest diameter at the rear end.
A needle 3 is fixed to the distal end surface of the needle base 4 by an adhesive or by thermal welding. And the short cylindrical body 22 which becomes a small diameter sequentially
a, 22b, 22c, 22d, 22e, and 22f are fitted to the base end of the inner needle 2 in a contracted state in which they are fitted to each other. The tail end of the base 9 is fixed by an adhesive or by thermal welding. Therefore, in the present embodiment, the base 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 9 when extended. I have. A short cylinder 22 at the forefront of the needle case 21
All short cylinders 22a, 22b, 22c, 22 except f
d, 22e are formed with inward projections 25 formed by grooves provided discontinuously in the circumferential direction, which are located slightly rearward from the front end, and the inward projections 25 and the short cylindrical body in front thereof are formed. The outwardly projecting edge 23 constitutes a shrinkage preventing means which cooperates with each other and serves as a detent. In this embodiment having such a configuration, the cannula 7 is fitted to the inner needle 2 by exposing the puncture blade 3 to the front, 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, a cannula 7 is used for performing blood transfusion and the like.
Is left punctured in the blood vessel, and the inner needle 2 is withdrawn. This withdrawal is performed in exactly the same manner as in the prior art, in which the needle base 4 is pulled, and the needle case body 21 having the leading end fixed to the base 9 and the tail end fixed to the needle base 4 is a short cylindrical body 22b, 22c, 2
As the 2d, 22e, and 22f are sequentially extracted, the inner needle 2 always extends in the state shown in FIG. 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 located inside the base 21. Accordingly, when the cannula 7 is fixed and the needle base 4 or the base 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 needle case 21 having the base 9 as a part of a component can be disposed of while completely wrapping the inner needle 2. In this embodiment, the short cylinders 22a, 22b, 2
2c, 22d, 22e, 22f tail edge outward protrusion 23
As shown in the enlarged portion of FIG. 1 (C), the inclined edge protrudes rearwardly in a trumpet shape, so that when it extends, it comes into contact with the inward projection 25 and contracts elastically to pass through. However, when trying to return to the contraction direction, it cannot pass because the force in the expanding direction acts on the inward protrusion 25, so that the short cylinders 22b, 22c, 22d, 22e, and 22f are short rear cylinders. The body 22 a, 22 b, 22 c, 22 d, 22 e only has a play which expands and contracts in the longitudinal direction by a length corresponding to the distance between the inward protruding edge 24 and the protrusion 25. Further, since the inward protruding edge 24 at the tip is a slanted needle protruding edge which is gradually narrowed forward, it does not come out even if it is extended in contact with the outward protruding edge 23 with a strong force. Embodiment 2 FIG. 2 shows an example of a puncture needle constituted by applying an outer case body having a bellows structure to a syringe needle of a syringe. Injection needle 3 that constitutes
Numeral 2 is embedded and fixed to the distal end of a hard synthetic resin needle base 34 whose base end is connected to the distal end of the syringe barrel. The needle case body 41 comprises a bellows body 42 made of a soft synthetic resin, and a pipe-shaped cover body 43 formed integrally with the tip thereof or formed separately from the tip thereof with an adhesive or heat welding. Near the base end of the cover 43, an elastic packing 44 made of a highly elastic material such as silicon rubber is provided. The bellows body 42 of the needle case body 41
Is made to contract when left unattended, and is fitted to the proximal end of the injection needle 32 in this state, and the proximal end of the bellows 42 is attached to the distal end surface of the needle base 34 with an adhesive or by heat welding. Is fixed. The puncture blade 33 is located inside the cover body 43 when the bellows body 42 is extended. An annular groove 35 is provided at a tip portion of the injection needle 32 near the puncture blade 33, and the annular groove 35 functions to insert and lock the elastic packing 44 to prevent the bellows body 42 from contracting. Therefore, the annular groove 35 and the elastic packing 4
4 constitutes a means for preventing shrinkage of the needle case body 41. The present embodiment having such a configuration is used in the state shown in FIG. 2A in which the needle case body 41 is contracted, and the elastic packing 44 wraps around the injection needle 32 and It is in close contact with the outer peripheral surface in a pressure contact state. For this reason,
The resilient packing 44 acts as a brake to prevent the bellows 42 from inadvertently extending. When the injection needle 32 is withdrawn from the human body after the injection, or while the extraction, the cover body 43 pulls in the distal direction by overcoming the braking force of the elastic packing 44 so that the bellows body 42 pulls the injection needle 32 to the distal end. It elongates while gradually wrapping toward. Then, when fully extended, the elastic packing 44 is fitted and locked in the annular groove 35 as shown in FIG.
Keeps the extended state without recovering the contraction,
By projecting the needle 3 to the front of the puncture blade 33, the needle case body 41 can completely discard the injection needle 32 and can be discarded. 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 another embodiment of the shrinkage preventing means provided on the needle body side for holding the outer case body 41 having the bellows structure in the extended state in cooperation with the elastic packing 44. Is formed to have a tapered shape having a large diameter toward the distal end over substantially the entire length, and the elastic packing 44 pressed against the tapered outer peripheral surface portion 52 is gradually compressed as the distal end moves to increase the frictional force. It is. The shrinkage prevention function is provided by the needle case body 41.
Should work when the needle 51 is completely wrapped,
The tapered outer peripheral surface 52 may be formed only at the tip of the injection needle 51. Needless to say, the needle case body 21 having the telescope structure can be applied to the injection needle 32 and the needle case body 41 having the bellows structure can be applied to the indwelling needle 1. Needless to say, the needle bases 4 and 34, the short cylindrical body 22a or the bellows body 42, the base body 9 and the cover body 43 may be fixed to each other by mechanical means such as screw connection or luer connection. As described above, the total length of the needle body or
The needle case body, which can be extended to a large length, has the base end at the tip of the needle base
Fixed and fitted to the base end of the needle body in a contracted state.
And maintain the extended state when the needle case body is extended.
Medical puncture needles equipped with
The shrinkage preventing means is attached to the tip of the needle case body.
An elastic patch that is attached to the outer peripheral surface of the needle
King and the elastic packing formed at the tip of the needle body
The annular groove that fits and locks the ring
When the injection needle is removed from the human body after shooting, or
While removing the needle case,
By pulling in the direction of the tip to overcome the
Body gradually wraps the needle toward the tip of the needle
The elastic packing fits into the annular groove and locks
Therefore, even if you release your hand, the needle case
And it can maintain the stretched state without rattling.
It has the following effects.

BRIEF DESCRIPTION OF THE 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 needle, 4 needle base, 21, 41 needle case body,
22a, 22b, 22c, 22d, 22e, 22f Short cylindrical body, 23 Outward projecting edge, 24 Inward projecting edge, 2
5 inward projection, 32 injection needle, 34 needle base, 3
5 annular groove, 42 bellows, 44 elastic packing,

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61M 5/00 373 A61M 5/158 A61M 5/32

Claims (1)

(57) [Claims 1] A needle case body which can be extended to the entire length of the needle body or longer than the needle body has its base end fixed to the tip of the needle base and attached to the base end of the needle body. In a medical puncture needle fitted in a contracted state and provided with a contraction preventing means for holding the extended state when the needle case body is extended , the contraction preventing means may include a distal end portion of the needle case body. Attached to
Elastic packing tightly pressed against the outer peripheral surface of the needle body
And the elastic packing formed at the tip of the needle body.
A medical puncture needle comprising: an annular groove that fits and locks .