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Needle bearing medical device with three-position shield

  • US 4,752,290 A
  • Filed: 07/27/1987
  • Issued: 06/21/1988
  • Est. Priority Date: 07/27/1987
  • Status: Expired due to Fees
First Claim
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1. In a medical device comprising an elongated structure having proximal and distal end sections and an internal liquid passageway, a hollow needle having a point and an opposite end axially mounted at said proximal end section of the elongated structure in communication with said liquid passageway, and a tubular protective shield having first and second end portions, said shield mounted around a portion of said elongated structure and longitudinally movable from a needle-covering position, wherein the first end portion of said should extends beyond said needle point to a needle-exposing position, the improvement comprising:

  • a plurality of angular, inwardly-depending raked teeth circumferentially formed along an inner surface of the second end portion of said tubular protective shield;

    a plurality of angular, outwardly-extending raked teeth around the distal end section of said elongated structure, the angle of said outwardly-extending teeth being substantially complementary to the angle of the inwardly-depending teeth on said protective shield;

    a distal retaining ring extending annularly around the distal end section of said elongated structure for cooperating with said inwardly-depending teeth on said protective shield to releasably hold said shield in a needle-exposing position;

    an intermediate retaining ring extending annularly around said elongated structure, between said outwardly-extending teeth and said distal retaining ring, for cooperating with said inwardly-depending teeth on said protective shield to releasably hold said shield in a needle-covering position; and

    at least one cut-out in the surface of of said protective shield for facilitating the mounting of said shield around said elongated structure.

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