Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-10-06
1996-07-09
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604195, A61M 500
Patent
active
055339751
ABSTRACT:
A safety syringe includes: a hollow needle assembly having a hollow needle portion detachably coupled to a shank portion embedded in a sleeve portion of a syringe and having a needle head portion formed on a rear portion of the shank portion, and a plunger slidably held in the syringe and having a biasing socket recessed in the plunger for engaging the needle head portion of the needle assembly for a coupling of the needle assembly with the plunger for a retraction into the syringe for obliquely biasing the needle portion for preventing re-protrusion of the needle outwardly, the shank portion having a pair of bars engageable with any one of the two wedged extensions formed in a cylindrical recess in the sleeve portion for preventing a rotation of the shank portion in the sleeve portion for reliably coupling the hollow needle portion on the shank portion.
REFERENCES:
patent: 5273539 (1993-12-01), Chen
patent: 5295973 (1994-03-01), Chen
patent: 5330440 (1994-07-01), Stanners et al.
patent: 5338304 (1994-08-01), Adams
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