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Blood lancet device

  • US 4,442,836 A
  • Filed: 03/18/1981
  • Issued: 04/17/1984
  • Est. Priority Date: 03/22/1980
  • Status: Expired due to Term
First Claim
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1. A blood lancet device comprising:

  • a housing having a lancet exit opening;

    means receptive of a lancet for guiding same in the housing for movement between a retracted position and a puncturing position wherein the lancet projects from the exit opening;

    means for releasably spring loading the lancet into the retracted position for impulse-like movement into the puncturing position upon release with immediate return movement towards the retracted position, the releasable spring loading means comprising a movable stop membber for retaining the lancet in the retracted position, two springs, the first spring for applying a force to move the lancet towards the puncturing position and the second spring for applying a force to immediately thereafter move the lancet towards the retracted position and means for transmitting the force of the first spring to the lancet and for discontinuing the application of the force by the first spring during the movement of the lancet towards the puncturing position; and

    triggering means for moving the stop member to enable movement from the retracted position to the puncturing position.

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