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Irrigating, cutting and aspirating system for percutaneous surgery

  • US 4,678,459 A
  • Filed: 07/23/1984
  • Issued: 07/07/1987
  • Est. Priority Date: 07/23/1984
  • Status: Expired
First Claim
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1. A surgical instrument comprising:

  • a housing;

    a needle supported by said housing, said needle having a forward portion extending distally of said housing;

    said needle including a first elongated tubular wall member defining a first bore, and having a port formed entirely within the sidewall of the forward portion of said first tubular wall member;

    said needle including a second elongated tubular wall member defining a second bore sized to permit passage of tissue therethrough when said second tubular wall member is connected to a source of suction, said second tubular wall member having a forward portion extending radially outwardly and terminating in a cutting edge;

    said second tubular wall member being positioned within said first tubular wall member with said cutting edge in contact with the sidewall defining said first bore, the forward portion of said first bore adjacent said port defining a tissue receiving portion communicating with said second bore;

    said first and second tubular wall members being the only tubular wall members in said forward portion of said needle;

    the wall of said second tubular wall member spaced inwardly from the wall of said first tubular wall member to define the opposing walls of an annular passageway adapted to be connected to a source of irrigating fluid, said annular passageway being the sole annular chamber in said forward portion of said needle;

    said second tubular wall member being disposed for movement within said first tubular wall member to cause said cutting edge to move from a first position where tissue is drawn through said port into said tissue receiving portion of said first bore under suction to a second position where said cutting edge traverses said port to sever the tissue drawn therethrough, and to permit the severed tissue to be captured in said tissue receiving portion;

    said second tubular wall member having an opening formed in its sidewall adjacent said cutting edge to provide internal communication between said annular passageway and said second bore to permit direct passage within said needle of irrigating fluid between said annular passageway and said second bore;

    the forward portion of the sidewall of said first tubular wall member having no opening rearward of said cutting edge of said second tubular wall member when said cutting edge is in its first position;

    whereby the severed tissue is evacuated through said second bore with the aid of the irrigating fluid.

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