Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-12-22
1995-10-17
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604218, 604222, 604195, A61M 500
Patent
active
054585767
ABSTRACT:
A retracting needle safety syringe (2) includes a barrel (4) having a tip (10), to which a needle assembly (28) is mounted, and a plunger (6) including a stem (34) and a piston (40) at the distal end of the stem. The piston has a piston body (46) and a piston seal (58) which engages the barrel inner surface. The piston seal is detached from the piston, the piston body is secured to the tip, and the tip of the barrel is detached from the remainder of the barrel when the plunger is moved to its distal position. Pulling the plunger proximally from the distal position back towards a proximal position causes the piston body, the tip and needle assembly to be pulled into the interior (56) of the barrel, but without the piston seal sliding against the barrel. This retraction can take place manually or automatically.
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Engineering sketch of Braun two-piece syringe dated 16 Dec. 1993.
Foster Clark B.
Haber Terry M.
Smedley William H.
Habley Medical Technology Corp.
Yasko John D.
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