Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-12-29
1995-01-17
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604195, A61M 500, A61M 532
Patent
active
053822358
ABSTRACT:
Existing syringes are retrofittable with structure for capturing and enabling retraction of so-called extended needles proximally into the cylinders of the syringes upon complete expulsion of a medicament, without requiring alteration of the existing structure for attaching pistons and piston stems in order to mount the capturer. At complete expulsion of fluid from the cylinder, the typical rubber piston is pierced by a sharp proximal end of the needle. Flexible tabs of the capturer deflect proximally while maintaining engagement with the intruding needle, in order to cooperate with particular structure of the needle so as to maintain the captured state. The modification of the extended needle cannula also may include providing side ports which serve the dual functions of ensuring complete expulsion of the medicament and of cooperating with tabs of the capturer so as to cause canting of the retracted needle. Other or further modification of the needle may include a cone-shaped deflector for deflecting the capturer tabs proximally during capture and for preventing disengagement of the captured needle. An audible indicator provides the user with an indication that the needle is captured or, alternatively, that the piston has traveled distally sufficiently to effect the capture.
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R.M.S. Safety, Inc.
Rosenbaum C. Fred
Wilkens III Frank
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