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Disposable soft tissue biopsy apparatus

  • US 5,036,860 A
  • Filed: 11/24/1989
  • Issued: 08/06/1991
  • Est. Priority Date: 11/24/1989
  • Status: Expired due to Term
First Claim
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1. A soft tissue biopsy apparatus incorporating a cannula means and a needle means for obtaining a tissue specimen comprising:

  • an elongate housing having an opening at the front end thereof;

    a hollow cannula means positioned within said housing, and reciprocally movable therewithin, one end of said cannula means extending through said opening for insertion into tissue from which a specimen is to be taken;

    a needle means positioned within said cannula means and reciprocally movable therewithin, said needle means also having an end extending through said opening for insertion into the tissue and a sampling means adjacent said end in which a tissue specimen is capturable;

    slide means to which the needle means is operably connected and capable of moving said needle means independently of said cannula means;

    cocking means manually operable by a user of the apparatus for moving the slide means to a selected position prior to insertion of said cannula means and needle means into the tissue, whereby rearward movement of said slide means shifts said needle means and said cannula means from a first position to a second position;

    release means operable by the user after insertion of said cannula means and needle means into the tissue for initially returning said needle means to its first position and for then moving said cannula means relative to said needle means towards said first position, and movement of the cannula means into a position causing the end of the cannula means to cover the sampling means of the needle means whereby the tissue specimen is captured between said cannula means and needle means;

    spring means providing a force biasing the cannula means and needle means to their respective first positions, and a motive force for moving the respective means upon operation of the release means;

    said cannula means including a cannula assembly and the needle means including a stylet assembly;

    said cannula assembly including a cannula, a pedestal at one end to which the cannula is connected and from the other end of which a concentric, hollow extension of the cannula extends; and

    the stylet assembly including a stylet, a base to which one end of the stylet is attached, and means interlocking with the pedestal to limit movement of the cannula assembly.

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