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Self disabling, single use, hypodermic syringe

  • US 5,084,017 A
  • Filed: 10/10/1989
  • Issued: 01/28/1992
  • Est. Priority Date: 10/10/1989
  • Status: Expired due to Fees
First Claim
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1. A single use, self disabling syringe comprising an elongate barrel tube incorporating an internal smooth bore, a small opening at the distal end of said barrel tube constrictedly configured for a hollow needle to be affixed to said distal end;

  • a plunger assembly axially disposed within said bore, said plunger assembly comprising a piston with incorporated seals of resilient material fitting snugly within said bore, an actuating rod connected to and extending from said piston and protruding through the proximal end of said barrel tube, said plunger assembly facilitates the initial aspiration and dispensing of a solution into and from said bore;

    a means for irreversibly disconnecting said piston from said actuating rod whereby aspiration of a solution into said bore is not possible once originally aspirated solution is partially or fully dispensed, said disconnecting means comprising a spring arm detent and a locking lug on said distal end of said actuating rod; and

    a lug engagement seat on said piston, radiused surface means for releasably interengaging said locking lug in said lug engagement seat, stop means for preventing reengagement of said lug in said seat, such that once disengaged, said lug cannot be reengaged in said seat.

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