Retractable needle medical devices

Details Retractable needle medical devices Retractable needle medical devices

1996-06-20

2000-08-01

McDermott, Corrine

Surgery

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

Treating material introduced into or removed from body...

604164, 604198, A61M 524

Patent

active

060960051

ABSTRACT:
Needle retraction mechanism for a medical device comprising a spring housing at the forward end of the device having an aperture for aligning a needle therein such that the needle extends forwardly out of the device. A spring is positioned concentrically about the needle and compressed within the spring housing. The needle is held within the spring housing against the expansive force of the spring by a needle retainer. The needle retainer forms the rear of the spring housing and comprises a plurality of axially extending resilient fingers. An actuating member, comprising a cavity for receiving the needle, is slidably positioned within a barrel of the device. The actuating member further comprises a forward facing shoulder surface formed to mate with rearward facing angled surfaces on the fingers. When the actuating member is urged in a forward direction within the barrel, the forward facing shoulder surface forcibly move the fingers out of engagement with the needle, thereby releasing the needle and propelling the needle into the cavity.

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