Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-09-08
1988-07-19
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
128765, A61M 5315
Patent
active
047582324
ABSTRACT:
A suction syringe for facilitating blood withdrawing operation by use of a vacuum produced and retained therein in advance is disclosed. This suction syringe comprises a barrel and a plunger slidably positioned in the barrel and is characterized in that the inner periphery of the bore at its proximal open end is provided with at least two chamfered portions and at least two un-chamfered portions in an alternative and equally spaced manner; and that at least two radially deformable elastic portions corresponding, in number and angular positions, to the chamfered portions of the bore in the barrel are integrally formed with the plunger; the elastic portions being depressed and completely received within the bore when the plunger is pushed into the bore of the barrel, and extending radially outwardly and engaging at the un-chamfered portions of the proximal end of the bore when the plunger is pulled rearwardly to a location where the depression force of the bore of the barrel against the elastic portions of the plunger is released; whereby the plunger, when pulled rearwardly to the above location, is locked in same location due to a vacuum produced within the bore, and also due to the engagement of the elastic portions of the plunger with the un-chamfered portions at the proximal end of the bore in the barrel.
REFERENCES:
patent: 2959170 (1960-11-01), Laub
patent: 3478937 (1969-11-01), Solowey
patent: 3747812 (1973-07-01), Karman et al.
patent: 4267846 (1981-05-01), Kontos
patent: 4386606 (1983-07-01), Tretinyak et al.
patent: 4562844 (1986-01-01), Carpenter et al.
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