Safety syringe with retracting needle

Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...

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Details

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.

REFERENCES:
patent: 4507117 (1985-03-01), Vining
patent: 4826489 (1989-05-01), Haber et al.
patent: 4966593 (1990-10-01), Lennox
patent: 5013301 (1991-05-01), Marotta, Jr.
patent: 5064419 (1991-11-01), Gaarde
patent: 5084018 (1992-01-01), Tsao
patent: 5085640 (1992-02-01), Gibbs
patent: 5114410 (1992-05-01), Batlle
patent: 5122118 (1992-06-01), Haber et al.
patent: 5180369 (1993-01-01), Dysarz
patent: 5190526 (1993-03-01), Murray et al.
Engineering sketch of Braun two-piece syringe dated 16 Dec. 1993.

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