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Locking syringe

  • US 5,057,078 A
  • Filed: 03/17/1989
  • Issued: 10/15/1991
  • Est. Priority Date: 03/17/1989
  • Status: Expired due to Term
First Claim
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1. A locking syringe, comprising:

  • a barrel including a set of internal threads;

    a plunger disposed at lest partially within the barrel, the plunger comprising a set of external threads disposed on at least a portion of said plunger along the longitudinal axis thereof and which may threadably engage the set of internal threads; and

    a triggering means attached to the plunger for selectively retracting said external threads, such that when the triggering means is actuated, the external and internal threads maintain a position of disengagement, thereby enabling the plunger to be freely moved with respect to the barrel.

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