A device for dosing a liquid preparation

Details A device for dosing a liquid preparation A device for dosing a liquid preparation

A - Human Necessities

61

M

A61M 5/315 (2006.01) A61M 5/20 (2006.01) A61M 5/24 (2006.01)

Patent

CA 2138296

An injection device is provided for an infinitely variable metering and administering of a liquid preparation and comprising a holder device for a multi-dose injection cartridge, the rear piston of which may be moved forward by means of a piston rod. The piston rod is provided with releasable locking means comprising at least one longitudinal groove having a wedge-shaped cross section and at least one locking lug having a cross section adapted to that of the groove, and means for urging the locking lug or lugs into said groove or grooves to lock the movement of the piston rod, or to release the locking lug or lugs from said groove or grooves to free the movement of said piston rod. At its rear end, the piston rod is connected to a spring device for moving the piston rod forward and to a device for determining the stroke of the piston rod when the preparation is administered.

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