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Multi-use cannula system

  • US 5,295,980 A
  • Filed: 09/30/1991
  • Issued: 03/22/1994
  • Est. Priority Date: 10/30/1989
  • Status: Expired due to Term
First Claim
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1. A surgical combination infusion/aspiration cannula comprising an elongated probe member characterized by:

  • (a) a single tubular distal section having a generally cylindrical, axially asymmetrical, hollow interior bore, the asymmetry producing relatively thick and relatively thin sidewall sectors, the interior bore configured to optionally carry a stilette member therein;

    (b) an insertion tip distally contiguous with the tubular section and of asymmetrically reduced outer cross-section with respect to the tubular section;

    (c) a transition portion in the form of a gradual arcuate taper, the taper being generally in the relatively thin wall sector of the tubular section;

    (d) the tip portion further comprising a rounded blunt closed tissue penetration end for atraumatically penetrating subcutaneous tissue and having a generally radially disposed infusion/aspiration opening rearward of the penetration end, the opening being configured with the asymmetry of cross-section so as to be at least partially protected to prevent incursion of foreign material during insertion of the probe; and

    (e) wherein the edges of the opening have a blunt outward directed surface and sharpened inner edge component configured to cooperate with the cutting surface of a compatible stilette member to excise tissue specimens.

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