Syringe

Details Syringe Syringe

1989-11-15

1990-11-13

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604198, A61M 532

Patent

active

049698770

ABSTRACT:
A syringe assembly which greatly reduces the chances of an operator coming in contact with an infectious needle. The syringe assembly includes an outer casing within which an inner chamber slides. A plunger having a sealing plug at one end extends into both the inner chamber and outer casing such that the sealing plug is fixedly secured within the interior of the inner chamber and outer casing, yet free to slide along the length of the inner chamber. The inner chamber and outer casing are structured such that the needle can be retracted completely within the interior of the outer casing when the inner chamber is releasably locked at the rear end of the outer casing. The needle can also be placed into an operational position when the inner chamber with attached needle is releasably locked at the forefront of the outer casing. The releasable locking of the inner chamber to the outer casing at the forward and rearward ends of the outer casing is achieved by either utilizing frictional contact between the two which is greater than that between the inner chamber and sealing plug. In an alternative embodiment, a knob/groove or ridge/groove locking arrangement is used. The releasable locking arrangement relied on are such that by simply pushing the plunger forward or rearward, the needle can be retracted or placed in operative position without the requirement for complicated alignment and twisting operations.

REFERENCES:
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patent: 2935067 (1960-04-01), Douet
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patent: 4507117 (1985-03-01), Vining et al.
patent: 4631057 (1986-12-01), Mitchell
patent: 4639249 (1987-01-01), Larson
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patent: 4650468 (1987-03-01), Jennings, Jr.
patent: 4675005 (1987-06-01), Deluccia
patent: 4692156 (1987-09-01), Haller
patent: 4710170 (1987-12-01), Haber et al.
patent: 4723945 (1988-02-01), Theiling
patent: 4767413 (1988-08-01), Haber et al.
patent: 4840619 (1989-09-01), Hughes

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