Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
2000-02-09
2001-04-17
Mendez, Manuel (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
Reexamination Certificate
active
06217551
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to an injection needle of an injector.
(2) Description of the Prior Art
FIG. 1
is a diagram showing partly in a section an injector A provided with a conventional injection needle.
The conventional injection needle
9
is so formed that a metal needle
11
is fixed by an adhesive or the like on an attachment base
10
made of resin, and the injection needle
9
is fitted to a shaft portion at the front end of a hollow barrel
1
of the injector A.
There is a social problem that the injection needle of the conventional injector may not be properly handled with respect to the safety after use, and erroneously piercing accidents may occur in medical workers, causing an infection from needles contaminated by HIV, HCV and the like. The present invention is to solve such a problem.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an injection needle which can be easily sealed inside of the injector by a medical worker after use and which can prevent infections by HIV, HCV and the like, due to erroneous piercing of the needle.
The present invention has a construction described below to solve the above problem.
An injection needle according to a first gist of the present invention is an injection needle provided at the tip of an injector, characterized in that the injection needle is provided with a rotatable operation member in front of a base thereof, an engagement member is fixed rearward on the outer periphery of the needle, a spring is provided in such a manner that the front of the needle is protruded toward the front end of the operation member while the engagement member pierces into the center of an axis of the base and the operation member, and the engagement member is energized backward with respect to the base, and the engagement member is latched by the front of the base to hinder the retreat of the engagement member, and when the operation member is rotated with respect to the base from the foregoing state, the hindrance to retreat of the engagement member with respect to the base is released, resulting in a deep retreat of the needle from the front end of the operation member.
An injection needle according to a second gist of the present invention is the injection needle of the first gist, wherein the base can be attached detachably to the shaft portion at the tip of the hollow barrel of the injector.
An injection needle according to a third gist of the present invention is the injection needle of the first gist, wherein the engagement member has a piece portion projecting in the radial direction and extending forward to the front end of a cylinder, and there is provided in the axial center portion of the operation member a manipulation hole to which the piece portion of the engagement member is fitted by insertion to integrate the engagement member with operation member with respect to rotation and there is provided in the axial center portion of a shaft portion in front of the base a retreating hole to which the piece portion is fitted by insertion when the piece portion of the engagement member agrees with the retreating hole, in the state that the front of the needle protrudes from the front end of the operation member, a stepped portion at the rear end of the piece portion of the engagement member is disagreed with the retreating hole and is latched at the front end of the shaft portion in front of the base.
REFERENCES:
patent: 4906236 (1990-03-01), Alberts et al.
patent: 5088986 (1992-02-01), Nusbaum
patent: 5843034 (1998-12-01), Redfern et al.
patent: 6056726 (2000-05-01), Isaacson
patent: 6-142204 (1994-05-01), None
patent: 6-66691 (1994-09-01), None
patent: 7-51372 (1995-02-01), None
patent: 8-141082 (1996-06-01), None
patent: 9-503948 (1997-04-01), None
patent: 9-308690 (1997-12-01), None
Darby & Darby
Mendez Manuel
Mitsubishi Pencil Kabushiki Kaisha
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