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Protective device for cannula used to draw blood

  • US 4,900,310 A
  • Filed: 10/07/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 10/07/1988
  • Status: Expired due to Fees
First Claim
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1. A protective device for a cannula used to draw blood, the device comprising:

  • an elongated sheath open at one end and including a longitudinal slot;

    stop means at the other end of the sheath;

    a piston disposed in the sheath to be longitudinally slidable between an extended position against the stop means and a retracted position away from the stop means, the piston having a bore extending through it in the direction in which the piston slides;

    means for securing an elongated cannula in the piston bore so the cannula extends longitudinally through the bore with one end of the cannula in the sheath and the scarf end of the cannula extending outwardly away from the sheath when the piston is in the extended position; and

    a slidable sleeve disposed around the sheath and connected to the piston through the slot so that as the sleeve slides relative to the sheath and away from the stop means, the piston is moved longitudinally within the sheath to the retracted position and thus moves the scarf end of the cannula to a safely enclosed position within the sheath.

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