Automatic needle-retracting syringe

Details Automatic needle-retracting syringe Automatic needle-retracting syringe

1990-06-01

1992-06-16

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604198, 604218, 604221, 128919, A61M 500

Patent

active

051221187

ABSTRACT:
An automatic needle-retracting syringe (2,80), intended for single use applications, includes a barrel (4), having a needle end (6), a plunger end (8) and a bore (10), and a plunger (12) at the plunger end. A needle gasket (16) is slidably mounted within the bore to define a near region (18) and a far region (20). A hollow needle (28) is mounted to the needle gasket. A path (26) through the needle gasket connects the near region to the needle. A coil spring (40,82) biases the needle gasket from an extended position to a retracted position, the needle fully housed within the barrel at the latter. The extended position is maintained by a retaining capsule (44) wedged between a narrowed bore portion (42) and the needle gasket. The retaining capsule is a gelatin which weakens upon contact with the liquid injectant so that after the liquid injectant contacts the retaining capsule for a period of time, the spring breaks the capsule causing the needle gasket to be moved back to the retracted position, thus retracting the needle back into the barrel. In addition, a supplemental flow path from the near region to the ambient environment can be created by dissolving a gelatin barrier to help prevent reuse of the syringe.

REFERENCES:
patent: 2771880 (1956-11-01), Gotthart
patent: 4921486 (1990-05-01), DeChellis et al.
patent: 4927414 (1990-05-01), Kulli
patent: 4955868 (1990-09-01), Klein
patent: 4966593 (1990-10-01), Lennox
patent: 4973316 (1990-11-01), Dysarz
patent: 4976693 (1990-12-01), Haast
patent: 4994034 (1991-02-01), Botich et al.
patent: 5017187 (1991-05-01), Sullivan
patent: 5019044 (1991-05-01), Tsao
patent: 5049133 (1991-09-01), Villen Pascual
patent: 5053010 (1991-10-01), McGary et al.

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