Endoscope cutting and retrieving snare instrument

• US 8,206,401 B2
• Filed: 07/15/2005
• Issued: 06/26/2012
• Est. Priority Date: 07/15/2005
• Status: Active Grant

• Current Assignee: Granit Medical Innovations LLC
• Original Assignee: Granit Medical Innovations LLC
• Inventors: Nakao, Naomi L.
• Primary Examiner(s): Nguyen, Tuan
• Assistant Examiner(s): McEvoy, Thomas
• Application Number:
  US11/182,543
• Publication Number:
  US 20070016224A1
• Time in Patent Office: 2,538 Days
• Field of Search: 606/113, 606/114, 606/127, 606/110, 606/128, 606/200, 606/170, 601/4
• 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 17/32056 Surgical snare instruments for removing or smashing calculi A61B2017/2212; tonsillotomes A61B17/26
• CPC Class Codes: A61B 2017/00287 Bags for minimally invasive surgery
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop

Abstract

An endoscopic cutting and retrieval instrument includes an elongate electrically conductive wire and an inner loop and an outer loop both connected to a distal end of the wire. The inner loop and the outer loop have a common proximal loop portion and different distal loop portions. The distal loop portion of the outer loop is longer than the distal loop portion of the inner loop so that the outer loop is larger than the inner loop. A net attached to the outer loop forms a retrieval basket for capturing severed polyps and other tissues masses.

Claims

1. A surgical instrument used for endoscopic resection and retrieval of internal tissues, comprising:

a. a tubular member insertable through a biopsy channel of an endoscope, said tubular member having an inner diameter;

b. an elongate slider member movably extendible through said tubular member;

c. an end-effector connected to a distal end of said slider member, said end-effector having a collapsed configuration inside said tubular member and an expanded configuration outside said tubular member, said end effector comprising an inner and an outer loop portion, said loop portions having a common proximal loop portion and different distal loop portions, said proximal loop portion comprising two loop arms each connected at a proximal end to a respective connector section and in turn at least indirectly connected to said slider member, the connector sections having a fixed configuration relative to one another, said two loop arms being movable relative to one another so as to reconfigure said end-effector from said collapsed configuration to said expanded configuration, said two loop arms each extending in a distal direction away from the respective connector section and at least in part at an ever increasing distance away from the other of said two loop arms in the expanded configuration of said end-effector so that distal ends of said two loop arms are spaced from one another by a distance substantially larger than said inner diameter;

d. said inner and outer loop portions each including, at respective distal ends thereof, a nose, each said nose being a substantially U shaped bend wherein two arms of each said U shaped bend remain in a fixed configuration relative to one another;

e. said end effector further comprising a capture pouch, said pouch being fixedly attached at a distal end thereof to the nose of said outer loop portion, and slidably extendable around at least the distal portion of said outer loop portion; and

f. at least one tether fastened at one end thereof to said pouch, and anchored at another end thereof to a point inside said tubular member, wherein said tether has a length that is less than the distance between the anchor point inside said tubular member and a mouth opening at a distal end of said tubular member.