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Auto-retracting needle injector system

  • US 5,167,641 A
  • Filed: 05/29/1991
  • Issued: 12/01/1992
  • Est. Priority Date: 05/29/1991
  • Status: Expired due to Fees
First Claim
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1. A safety medicament injection system comprising:

  • (a) an ampule comprising;

    (i) a housing forming at least a portion of a medicament chamber and having a front opening in fluid communication with the chamber;

    (ii) a resilient closure member for sealingly closing the front opening;

    (iii) resilient seal means for sealingly closing a rear portion of the chamber;

    (iv) a tubular tissue-piercing needle movably supported within the housing for axial movement from a cocked position to an extended position, the needle having a front outlet and an inlet rearwardly located relative to the outlet and in fluid communication therewith, the needle piercing the seal means and the closure member when moving from the cocked position to the extended position; and

    (v) needle biasing means for biasing the needle rearwardly from the extended position;

    (b) actuation means for advancing the needle from the cocked position to the extended position in response to external force, the chamber being compressed by the actuation means for feeding the medicament from the chamber, into the inlet and out of the outlet of the needle; and

    (c) the needle biasing means automatically moving the needle from the extended position to a final position in response to removal of the external force, the outlet of the needle being enclosed within the chamber in the final position for preventing accidental contact therewith following use of the system.

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