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Shielded cannula assembly

  • US 5,312,366 A
  • Filed: 03/03/1993
  • Issued: 05/17/1994
  • Est. Priority Date: 11/16/1992
  • Status: Expired due to Fees
First Claim
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1. A shielded cannula assembly comprisinga housing;

  • a hollow cannula mounted in and extended from said housing, said cannula having a lumen for passage of a fluid therethrough;

    a tubular shield extending from said housing in an exposed manner relative to the surrounding environment, said shield having a resilient longitudinally collapsible tubular portion concentrically about said cannula and a transverse wall at a distal end to form a sealed chamber with said tubular portion to contain said cannula therein in a sterile condition, said wall being made of a material to permit penetration of said needle therethrough in response to longitudinal collapsing of said tubular portion and resealing of said wall in response to expansion of said tubular portion and withdrawal of said cannula therefrom; and

    means for selectively preventing longitudinal collapsing of said tubular portion.

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