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Device for dosing a liquid preparation

  • US 5,679,111 A
  • Filed: 03/10/1995
  • Issued: 10/21/1997
  • Est. Priority Date: 04/30/1993
  • Status: Expired due to Fees
First Claim
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1. An injection device for continuously variable metering and administering of a liquid injectable preparation, comprising a holder device for a multi-dose injection cartridge which comprises a front fixed wall through which may be arranged a liquid connection for discharging the preparation, and a rear movable wall which may be moved forward by means of a piston rod to expel the preparation from said cartridge, characterized in that the piston rod is provided with releasable locking means consisting of 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 said locking lug into said groove to lock the longitudinal movement of said piston rod, and to release said locking lug from said groove to free said piston rod, and that the piston rod at its rear end is connected to a spring device for moving said piston rod forward at the administering, and a device for setting the stroke of the piston rod when the preparation is administered.

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