Safety syringe incorporating automatic needle holder release

Details Safety syringe incorporating automatic needle holder release Safety syringe incorporating automatic needle holder release

1993-01-14

1996-11-26

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604110, 604198, A61M 532

Patent

active

055780156

ABSTRACT:
A safety syringe for preventing "needle stick" injury and/or reuse of the syringe includes a body (100), a plunger (127) mounted within the body, a protuberance (129) on the plunger for connecting the plunger to a needle holder (102) adapted in use to carry a needle at the end of an injection stroke of the plunger whereby subsequent retraction of the plunger withdraws the needle into a shielded position within the body. The syringe includes a braking device (123) disposed between the body (100) and the plunger (127) to retard but not stop the withdrawal of the plunger and needle after the injection stroke. The needle holder (102) includes a radially extending flange (108) which engages with a complementary rib (109) or groove on the syringe until the needle holder is engaged by the protuberance (129) on the plunger. Engagement of the protuberance with the needle holder deforms the needle holder by drawing the flange (108) radially inwardly to disengage the flange from the rib or groove on the syringe thereby allowing the needle holder and any needle attached to it to be drawn into the body of the syringe.

REFERENCES:
patent: 4813936 (1989-03-01), Schroeder
patent: 4888002 (1989-12-01), Braginetz et al.
patent: 4986813 (1991-01-01), Blake, III et al.
patent: 4995874 (1991-02-01), Strickland
patent: 5007903 (1991-04-01), Ellard
patent: 5112316 (1992-05-01), Venturini
patent: 5122124 (1992-06-01), Novacek et al.
patent: 5171300 (1992-12-01), Blake, III et al.
patent: 5211628 (1993-05-01), Marshall

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