Polyp retrieval assembly with cauterization loop and suction web

• US 5,417,697 A
• Filed: 03/29/1994
• Issued: 05/23/1995
• Est. Priority Date: 07/07/1993
• Status: Expired due to Fees

• Current Assignee: Cary W. Schneebaum, Peter J. Wilk
• Original Assignee: Cary W. Schneebaum, Peter J. Wilk
• Inventors: Wilk, Peter J., Schneebaum, Cary W.
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): DAWSON, GLENN K
• Application Number:
  US08/219,148
• Time in Patent Office: 420 Days
• Field of Search: 606/1, 606/32, 606/34, 606/37, 606/41, 606/43, 606/45-50, 606/110-115, 606/205-209
• US Class Current: 606/113
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 18/10 Power sources therefor
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61B 2017/308 with suction cups
• CPC Class Codes: A61B 2018/00642 with feedback, i.e. closed loop control
• CPC Class Codes: A61B 2018/1407 Loop

Abstract

A procedure for endoscopically removing a polyp utilizes an elongate tubular member having a cup-shaped web member at a distal end portion and an electrically conductive cauterization loop inserted through the tubular member. Upon insertion of an endoscope assembly into a patient, the distal end portion of the tubular member and the cauterization loop are ejected from the distal end of the biopsy channel of the endoscope assembly. Upon a subsequent opening of the cauterization loop, the cauterization loop is placed over a polyp to be removed, the web member is then opened and suction is applied through the tubular member to entrain the polyp to the web member. Electrical current is conducted to the cauterization loop to sever the polyp from the patient, and the loop is closed. The severed polyp is held in the web member by suction and is subsequently removed from the patient.

Claims

1. A surgical instrument assembly comprising:

an elongate tubular member insertable through a biopsy channel of an endoscope, said tubular member being provided at a distal end with a web member having a cup shape defining a concave inner surface;

a cauterization snare member inserted through said tubular member so that a cauterization loop at a distal end of said snare member is ejectable from the distal end of said tubular member; and

means operatively connected to said tubular member for enabling application of suction to said web member to generate a negative pressure at said inner surface upon an ejection of said web member from the biopsy channel of the endoscope and upon an opening of said web member from a collapsed configuration to said cup shape.

2. The assembly defined in claim 1, further comprising spreading means operatively connected to said web member for automatically opening said web member from said collapsed configuration to said cup shape upon an ejection of said web member from the biopsy channel of the endoscope.

3. The assembly defined in claim 2 wherein said spreading means includes a plurality of ribs attached to said web member, said ribs having a spring bias tending to open said web member from said collapsed configuration to said cup shape.

4. A method for removing an polyp from inside a patient, comprising the steps of:

providing a surgical device including an elongate tubular member having, at a distal end, a web member with a cup shape defining a concave inner surface;

also providing a cauterization snare member insertable through said tubular member so that a cauterization loop at a distal end of said snare member is ejectable from the distal of said tubular member;

inserting an endoscope assembly into a patient, said endoscope assembly having a biopsy channel with a distal end;

upon insertion of said endoscope assembly into the patient, pushing said tubular member through said biopsy channel so that said web member is ejected from the distal end of the biopsy channel;

opening said web member from a collapsed configuration to an opened configuration upon ejection of said web member from said biopsy channel;

also upon insertion of said endoscope assembly into the patient, shifting said snare member through said tubular member so that said cauterization loop is ejected from said tubular member;

opening said cauterization loop from a collapsed configuration to an opened configuration upon ejection of said cauterization loop from said tubular member;

upon the opening of said cauterization loop, maneuvering said cauterization loop from outside the patient to place said cauterization loop over a polyp to be removed;

upon placement of said cauterization loop over the polyp, conducting electrical current to said cauterization loop to sever said polyp from the patient;

during said step of conducting, shifting said cauterization loop and said tubular member relative to one another so that said cauterization loop is drawn back into said tubular member and closes about a portion of the polyp to sever the polyp;

applying suction through said tubular member to generate a vacuum force between said web member and the severed polyp to thereby entrain the severed polyp to the tubular member and removing said tubular member with the entrained severed polyp from the patient.