Retractable syringe

Details Retractable syringe Retractable syringe

1998-09-22

2000-07-04

McDermott, Corrine

Surgery

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

Treating material introduced into or removed from body...

604195, A61M 500

Patent

active

060831995

ABSTRACT:
A single use retractable syringe (1) comprises a hollow barrel (2), a needle (3) engaged with a first end (4) of the hollow barrel (2) and a plunger (5) slideably disposed in the hollow barrel (2). Corresponding interlocking portions (6,7) are provided on the plunger (5) and needle (3) and are engageable only when radially aligned. The syringe (1) is provided with means for rotating the plunger (5) relative to the needle (3) from an orientation where the corresponding interlocking portions (6,7) are radially non-aligned on an initial depression of the plunger (5) toward the hollow barrel first end (4) to expel air to an orientation where the corresponding interlocking portions (6,7) are radially aligned on a subsequent depression of the plunger (5) to dispense fluid from the hollow barrel (2), thereby enabling the corresponding interlocking portions (6,7) to engage and retract the needle (3) into the hollow barrel (2) on a subsequent retraction of the plunger (5) away from the first end (4) following use.

REFERENCES:
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patent: 5292314 (1994-03-01), D'Alessio et al.
patent: 5338311 (1994-08-01), Mahurkar
patent: 5346480 (1994-09-01), Hess et al.
patent: 5411487 (1995-05-01), Castagna
patent: 5429613 (1995-07-01), D'Amico
patent: 5514097 (1996-05-01), Knauer
patent: 5531694 (1996-07-01), Clemes et al.
patent: 5562623 (1996-10-01), Shonfeld et al.
patent: 5643222 (1997-07-01), Mahurkar
patent: 5762634 (1998-06-01), Davis
patent: 5879338 (1999-03-01), Mahurkar

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