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Method and Apparatus for Reversing a Piston Rod in an Injection Device

  • US 20090124977A1
  • Filed: 01/31/2006
  • Published: 05/14/2009
  • Est. Priority Date: 02/23/2005
  • Status: Abandoned Application
First Claim
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1. A method for reversing a piston rod in an injection device, the piston rod being operatively connected to a motor shaft of an electrical motor so that a rotational movement of the motor shaft is transformed to a translational movement of the piston rod, the piston rod being adapted to be moved between two end positions, the method comprising:

  • providing a first supply voltage level to the electrical motor,measuring sets of corresponding values of current provided to the motor and piston rod position,shutting down the electrical motor in case the measured current provided to the motor exceeds a predetermined value, andcomparing a measured final position of the piston rod with a predetermined position range.

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