Single use medical needle

Details Single use medical needle Single use medical needle

1991-07-17

1993-06-15

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604177, 604263, A61M 532

Patent

active

052193390

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention is concerned with needles for medical uses such as those used in injection, infusion, blood collection, biopsy, puncture, examination, dialysis, and intra-venous retention, and more particularly with those for single use such as disposable injection needles.


BACKGROUND ART

Medical needles such as those used for injection, infusion, and blood collection generally possess sharp blade tips to puncture into skins of living bodies. Use of such needles in repetition is accompanied with risks of transmitting pathogens from a body to another, and it is now common that needles are used once and discarded.
There are, however, a number of people who handle the needles, including those who actually use the needles such as doctors and nurses, and those who handle the needles until final disposition of the needles. There is a potential danger that the needle tip accidentally injures the users before the use and particularly after the use, or accidentally injures those who handle the needles thereafter. The needles before use are sterile, but there arises risks of infection by transfer of pathogens through a medium such as blood when a needle is once used through the skin of a living body, and the tip then accidentally injures one or more other persons.
It is therefore desirable that such accidental puncturing is prevented throughout the life of needles from a time before the use until they are finally demolished. Needles for medical uses are generally distributed with their tips protected by caps. The caps are put on the tips again after the use for protecting the tips. It happens commonly, however, that the used needles are thrown away without the caps. The Japanese patent laid-open publication JPA62-72367 proposes safety devices for hypodermic needle or the like that connects a hypodermic needle with a sleeve. The sleeve slides along the needle after the use and is locked where the sleeve completely covers the needle.
As discussed in the foregoing, needles for medical uses bear a high risk of accidental puncturing from a time before the use until they are finally demolished.


DISCLOSURE OF INVENTION

An object of the present invention is to provide a medical needle that can be safely handled throughout the life from a time before the use until it is finally demolished.
The present invention provides a needle for medical use comprising of a cannula having a sharp blade tip, a supporting and connecting member holding said cannula and connecting with another functional member, and a cover member engaged with said supporting and connecting member, and being movable forward and backward along a longitudinal direction of the cannula, capable of covering said blade tip of the cannula, having a metastable position both at positions for covering said blade tip of the cannula, wherein when the cover member goes into the stabele position, it is no longer able to transfer to another position.
The cover member has meta-stable and stable positions that completely cover the blade tip of the cannula, and is able to protect the needle tip before the use at the meta-stable position, and after the use at the irreversible stable position.
As elaborated in the above, a needle for medical use according to the present invention can prevent accidental puncturing by having the covering member cover the sharp needle tip before and after the use, wherein it is in the meta-stable position before the use where the needle tip cannot be revealed unless it is intentionally handled, and it is in the locked (stable) position after the use.
The needle therefore makes it possible to keep a wide range of people, from the users like doctors and nurses to those finally demolish the needles, from being accidentally injured at the skin and getting infected with pathogens.


BRIEF DESCRIPTION OF DRAWINGS

FIGS. 1A-1F show an embodiment of the present invention applied to an injection needle.
FIGS. 2 and 3 are partly sectional side views of other embodiments of the present invention applied also to injection needles.
FIGS. 4

REFERENCES:
patent: 4826490 (1989-05-01), Byrne et al.
patent: 4842586 (1989-06-01), Hogan
patent: 4878902 (1989-11-01), Wanderer et al.
patent: 5011479 (1991-04-01), Le et al.

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