Surgical extractor

• US 20050055033A1
• Filed: 07/23/2004
• Published: 03/10/2005
• Est. Priority Date: 02/02/1995
• Status: Active Grant

• Current Assignee: Boston Scientific Corporation
• Original Assignee: Boston Scientific Corporation
• Inventors: Bates, James S., Leslie, Stephen W.
• Granted Patent: US 7,591,825 B2
• Time in Patent Office: Days
• US Class Current: 606/127
• 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 2017/2212 having a closed distal end, e.g. a loop

Abstract

A surgical extractor for removing objects from a body including, for example, calculi, such as kidney stones and gall stones. The extractor includes a handle at an proximal end of the extractor with a slider for operation by a physician. At the distal end the extractor includes a plurality of wires with each wire comprising a first portion having an individual strand and a second portion comprising a plurality of filaments. When a retaining sheath is retracted, the wires, formed of a shape memory material such as stainless steel, expand such that each of strands assume a spaced relationship to define a first section of a basket and the plurality of the filaments assume a spaced relationship to define a second section of the basket. The use of a basket formed by wires having a first section comprising an individual strand and a second section comprising the plurality of filaments promotes capture of objects within the body by having widely spaced wires in the first section, retention of such objects in the second section by multiplying the number of contacts with entrapped object, and improved selective release of such objects without any deleterious effect on the reliability or size of the extractor. Additionally, use of the basket enables improved dislodgment and capture of embedded or impacted objects.

Claims

1. In a surgical extractor for removing an object from a body including a retrieval basket with distal and proximal ends and a retractable sheath for retaining in a first position said retrieval basket in a compact condition and in a second position, freeing said retrieval basket for expansion to form an enlarged basket for retrieving an object, the improvement wherein said basket comprises a plurality of wires extending between said distal and proximal ends of said basket, each of said wires comprising an individual strand extending from one of said distal and proximal ends of said basket and a plurality of spaced filaments extending between said strand and the other of said distal and proximal ends.

2-44. -44. (Cancelled)