×

Syringe with retractable needle

  • US 5,046,508 A
  • Filed: 12/19/1989
  • Issued: 09/10/1991
  • Est. Priority Date: 12/19/1989
  • Status: Expired due to Fees
First Claim
Patent Images

1. A medical instrument comprising a needle and means for mounting said needle for movement between an extended operative position relative to said medical instrument where said needle is exposed for use and a retracted inoperative position where said needle is covered so as to reduce the likelihood of inadvertent contact with said needle;

  • wherein said mounting means comprises support means, needle biasing means, and actuating means, said support means mounting said needle in said extended and retracted positions, said needle biasing means being interposed between said support means and said needle and normally urging said needle toward said retracted position, said actuating means being mounted on said support means for movement between inner and outer positions and adapted to be disposed to retain said needle at said extended position in said inner position of said actuating means, said actuating means further being adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position to permit said needle biasing means to act on said needle thereby to force said needle to said retracted position;

    said actuating means comprising engaging means adapted to be disposed to engage said needle, to retain said needle in said extended position in said inner position of said actuating means, said engaging means being further adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position;

    said mounting means further comprises actuator biasing means interposed between said actuating means and said support means, and normally urging said actuating means toward said inner position, such that said engaging means is in a position of interference with movement of said needle to said retracted position, said actuating means being adapted to be moved toward said outer position, against forces exerted thereon by said actuator biasing means, to dispose said engaging means out of a position, and wherein said actuating means being movable relative to said support means through a limited axial distance, there being stops provided on said actuating means to prevent it from moving further than said limited axial distance within said support means.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×