Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1981-08-03
1984-03-20
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
A61M 100
Patent
active
044378599
ABSTRACT:
A syringe driving unit comprising free pistons in interconnected cylindrical chambers, one of the pistons carrying a syringe plunger driver and being biased, directly or indirectly, in the driving direction, and one piston being movable to force both pistons into primed or loaded position, the connections between the chambers including a pressure regulator, flow regulator and a needle valve to regulate adjustably the return flow or hydraulic fluid corresponding to the movement of the driving piston. The priming piston may be moved mechanically or pneumatically, and fail-safe mechanism may be provided, if needed, to become effective in case of leakage. Bolus delivery, to augment optionally the adjusted flow, is also provided for.
REFERENCES:
patent: 2101140 (1937-12-01), Hege
patent: 3605745 (1971-09-01), Hodosh
patent: 3640277 (1972-02-01), Adelberg
patent: 3690318 (1972-09-01), Gorsuch
patent: 4065230 (1977-12-01), Gezari
patent: 4150672 (1979-04-01), Whitney et al.
Burt Allan G.
Cox Nigel
Snyder Daniel R.
Whitehouse Craig M.
Berger Peter L.
DRS Infusion Systems, Inc.
Yasko John D.
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