A device for metering and administering a liquid preparation

Details A device for metering and administering a liquid preparation A device for metering and administering a liquid preparation

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2138295

An injection device is provided for the infinitely variable metering and administering of a liquid preparation from a multi-dose injection cartridge having a rear piston which may be moved forward by means of a piston rod. The longitudinal movement of the piston rod is governed by two couplings arranged along said piston rod and each being capable of releasably gripping the piston rod by locking means. The piston rod has a wedge-shaped cross section and each of the couplings comprises a clamping shoe which has wedge-shaped groove, the cross section of which is adapted to that of the piston rod, and lever means, by means of which the piston rod and each clamping shoe rosy be releasably clamped together to lock the piston rod in the groove of said clamping shoe.

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