Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1991-04-26
1992-01-28
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
050840185
ABSTRACT:
A safety syringe having a sliding base with a hole in a barrel to hold a locking tip to fix a needle cannula, in which the hole has a flange at the bottom to prevent downward sliding of the locking tip, the barrel being provided with a plurality of ventilation holes at the front end and a limiting flange at its inner wall to prevent from downward sliding of the sliding base so that the locking tip is positioned for injection, and a spring disposed at the locking tip between an end of the barrel and a needle extender so that when a hollow plunger with a cork at the top is pushed axially to the foremost position, the sliding base is forced to displace forwardly, and consequently the locking tip is forced to keep close contact with the extender and displace in an opposite direction. A further pushing of the plunger causes the fixed locking tip to pass through the flange at the bottom of the hole at the sliding base and then push the cork away from the plunger by upward displacement of the plunger. The cork, with the needle cannula and the locking tip, are displaced into the interior space of the plunger at the end of injection to prevent injury and infection from the used needle cannula.
REFERENCES:
patent: 4747831 (1988-05-01), Kulli
patent: 4838863 (1989-06-01), Allard et al.
patent: 4850977 (1989-07-01), Bayess
patent: 4874382 (1989-10-01), Lindemann et al.
patent: 4921486 (1990-05-01), Dechellis et al.
patent: 4978343 (1990-12-01), Dysarz et al.
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