Hydraulic syringe drive

Details Hydraulic syringe drive Hydraulic syringe drive

A - Human Necessities

61

M

128/82

A61M 1/10 (2006.01)

Patent

CA 1204975

HYDRAULIC SYRINGE DRIVE Abstract A syringe driving unit comprising free pistons (16,25) in interconnected cylindrical chambers (12,13), one of the pistons carrying a syringe plunger driver (31) and being biased, directly or indirectly, in the driving direction, and one piston (16) being movable to force both pistons into primed or loaded positions, the connections between the chambers including a pressure regulator (39), flow regulator (111) and a needle valve (110) to regulate adjustably the return flow or hydraulic fluid corresponding to the movement of the driving piston. The priming piston (16) may be moved mechanically or pneumatically, and a fail safe mechanism may be pro- vided, if needed, to become effective in case of leakage. Bolus delivery, to augment optionally the adjusted flow, is also provided for.

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