Surgical extractor

• US 4,347,846 A
• Filed: 10/14/1980
• Issued: 09/07/1982
• Est. Priority Date: 12/07/1979
• Status: Expired due to Term

• Current Assignee: Porges Societe Anonyme
• Original Assignee: Porges (Johnson & Johnson)
• Inventors: Dormia, Enrico
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US06/196,866
• Time in Patent Office: 693 Days
• Field of Search: 128/328, 128/345, 128/356
• 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

The present invention relates to a surgical extractor for removing foreign bodies from natural passages, of the type constituted by a flexible tube adapted to penetrate in the natural passages where the body to be extracted is located, the distal end of the tube comprising a cage or basket formed by steel wires which are retractable inside the tube in the positioning phase and adapted to be opened out for imprisoning the body to be extracted, expansion being ensured by maneuvering a steel wire housed in said tube and adapted to be maneuvered from the outside, wherein the retractable cage is formed by a plurality of flexible metal wires, for example steel wires, disposed in a helical path, certain of the wires following a helix in clockwise direction, while other wires, in equal number, follow a helix in anti-clockwise direction.

Claims

1. In a surgical extractor for removing bodies from natural passages, of the type comprising a flexible tube adapted to be inserted in a natural passage where the body to be extracted is located, the distal end of the tube having a retractable cage formed by flexible metal wires which are retractable inside the tube for positioning the tube in the passage and extendable for trapping the body to be extracted,

the improvement wherein the retractable cage is formed by a plurality of flexible metal wires arranged in pairs and disposed in helical paths, one wire of each pair being spiralled in clockwise direction and the other in anti-clockwise direction,

the wires of each pair intersecting at a single point between the ends thereof,

the spacing between wires in said cage being sufficient to permit the passage of said body into the interior of said cage.

2. An extractor in accordance with claim 1 wherein said point of intersection lies substantially in a plane located between the equitorial plane of the cage and the distal end thereof, whereby the cage comprises a relatively open proximal face in which the wires are relatively widely spaced, allowing free passage for the body to be trapped, and a relatively closed distal face in which the intersecting wires impede passage therethrough of the trapped body.