Syringe with cannula-protecting sheath and sealing center rod

Details Syringe with cannula-protecting sheath and sealing center rod Syringe with cannula-protecting sheath and sealing center rod

1994-08-01

1995-07-18

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604200, A61M 532, A61M 524

Patent

active

054337119

ABSTRACT:
A syringe assembly is comprised of a plunger, a syringe barrel having a cannula collar at one end of the barrel and an interior chamber within the barrel, a hollow cannula secured within the syringe barrel collar with the cannula extending axially from the collar to its distal end, a bore extending axially through the cannula and the syringe barrel collar, a segment of the bore decreasing (e.g., tapering) in diameter as it extends in a direction from the distal end of the cannula toward the barrel interior chamber, and a sheath removably attached to the syringe barrel and covering the cannula, the sheath being affixed to a center rod extending axially from the sheath into the bore at the cannula distal end and then seating in a sealing engagement with said segment of the interior bore.

REFERENCES:
patent: 1279530 (1918-09-01), Fitting
patent: 1711352 (1929-04-01), Jeffreys
patent: 2219301 (1940-10-01), Erhard
patent: 2578813 (1951-12-01), Kollsman
patent: 2668534 (1954-02-01), Barradus et al.
patent: 2742041 (1956-04-01), Lipari
patent: 2757671 (1956-08-01), Haafkens
patent: 3559645 (1971-02-01), Schaller
patent: 5199952 (1993-04-01), Marshall et al.

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