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Plunger and driver mechanism for an analyzer

  • US 5,271,896 A
  • Filed: 04/16/1993
  • Issued: 12/21/1993
  • Est. Priority Date: 04/16/1993
  • Status: Expired due to Term
First Claim
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1. In an analyzer for detecting analytes in a patient liquid deposited into a test element, the analyzer comprising a source of test elements including means for providing the test elements in stack, a plunger for moving the stack linearly to a test element dispensing location, a driver operatively connected to said plunger to drive said plunger to and away from said stack, said driver including means for converting rotary motion into linear motion, and a patient liquid depositor for depositing liquid into a dispensed test element;

  • the improvement wherein said plunger further includes a housing within which said plunger is reciprocatingly mounted for linear movement, and biasing means for biasing said plunger to move into said housing against the action of said biasing means, a portion of said driver being mounted on said housing; and

    a first sensing means for sensing when said plunger has moved into said housing against the action of said biasing means, so that a signal can be generated that said plunger has encountered said stack.

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