Disposable syringe with automatic needle retraction

Details Disposable syringe with automatic needle retraction Disposable syringe with automatic needle retraction

1991-10-15

1992-06-30

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604195, A61M 532

Patent

active

051258986

ABSTRACT:
A disposable medicinal syringe including a tubular plunger from which air has been evacuated and a seal member releasably attached on the distal end of the plunger. The plunger is slidingly and sealingly disposed in the barrel of the syringe. A luer lock assembly is mounted within the barrel and includes a releasable hub portion which is securely engageable with the releasable plunger seal member, the securely engaged members when released being actuated by ambient air pressure into retraction into the evacuated plunger. The luer lock assembly is adapted for receiving a hypodermic needle or other medical device. Following use of the syringe, longitudinal axial force is applied to the proximal end of the plunger, thereby detaching, in sequence, first and second annular thin-walled portions of the luer lock assembly to release the hub portion for movement within the barrel, securely mounting the plunger seal member into the luer lock hub, and detaching the plunger seal member from the plunger at an annular thin-walled portion. The combined luer lock hub/plunger seal member and attached needle or other medical device are then forced into the evacuated interior of the plunger, safely isolating the needle or other medical device inside the plunger.

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