Simplified safety syringe with retractable self-biased needle

Details Simplified safety syringe with retractable self-biased needle Simplified safety syringe with retractable self-biased needle

1993-12-16

1994-07-12

Hirsch, Paul J.

Surgery

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

Treating material introduced into or removed from body...

604195, A61M 532

Patent

active

053284755

ABSTRACT:
A safety syringe includes: a hollow needle normally held in a front portion of a syringe, a plunger slidably held in the syringe for injection use, a coupling member retained in the plunger engageable with at least a biasing socket recessed in a rear needle portion of the hollow needle with the biasing socket generally formed as a conical shape having a longitudinal conical axis inclined from a needle axis of the needle when normally fixed in the syringe with the needle axis aligned with a syringe axis longitudinally formed in a center line of the syringe, whereby upon retraction of the plunger and the needle coupled to the plunger, with the biasing socket of the needle forcibly coupled with the coupling member, into a bore portion in the syringe, the needle will be automatically inclined as the biasing socket of the needle is restored by the coupling member retained in the plunger to prevent an outward protruding of the retracted needle from the syringe for preventing its pricking to the others.

REFERENCES:
patent: 4955870 (1990-09-01), Reddersheim et al.
patent: 4986813 (1991-01-01), Blake, III et al.
patent: 5171300 (1992-12-01), Blake, III et al.
patent: 5205826 (1993-04-01), Chen
patent: 5232458 (1993-08-01), Chen
patent: 5242402 (1993-09-01), Chen
patent: 5273539 (1993-12-01), Chen

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