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Obesity Surgery

Biopsy-channel-for-endoscope

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Biopsy channel for endoscope

Details

Inventors: Krauter, Allan I.; Vivenzio, Robert L.;
Assignee: Welch Allyn, Inc. (Skaneateles Falls, NY)
Primary Examiner: Kamm; William E.
Assistant Examiner: Hindenburg; Max F.
Attorney, Agent or Firm: Bruns and Wall

A biopsy channel for use in the insertion tube of an endoscope or borescope having a reinforced length that passes through the steering section of the tube which can be bent to a small radius without collapsing or losing its circularity. The tubing is preferably a heat softenable thermoplastic and the reinforcement is a metal knitted fabric that is heat bonded into the outer surface of the tubing.

DETAILED DESCRIPTION It is therefore an object of the present invention to improve endoscopes and borescopes that are equipped with a tool access channel.
It is a further object of the present invention to provide an improved biopsy channel for use in an endoscope or a borescope that has a tubular section that is adapted to pass through the steering unit of the insertion tube which is flexible in bending and yet able to maintain a circular cross-sectional configuration when bent to a small radius.
Another object of the present invention is to reinforce a relatively thin-walled biopsy channel of an endoscope or borescope so that the channel will not close when it is bent to a tight radius.
Yet another object of the present invention is to provide an improved biopsy channel that is able to freely pass a tool therethrough when the channel is placed in a tight bend.
A still further object of the present invention is to provide a relatively inexpensive and easily fabricated lubricious biopsy channel having a reinforced section that has torsional stiffness and hoop strength for preventing the channel from closing when placed under torsional and/or bending stress.
These and other objects of the present invention are attained by a biopsy channel suitable for use in either an endoscope or a borescope that has a reinforced section that is situated within the steering unit of the instrument's insertion tube.
The reinforced section of channel includes a tubular substrate formed of a heat softenable thermoplastic material having an open weave metal fabric heat bonded to its outer surface which furnishes both high torsionable and hoop strength to the reinforced section.
The reinforced section is fabricated by placing the tubular substrate upon a mandrel and wrapping the outside of the substrate with an open mesh metal fabric.
The tube and fabric assembly is drawn through a heated die that is maintained at a temperature high enough to soften the outer periphery of the tubular substrate.
The metal fabric is forced inwardly into the softened material as it passes through the die cavity which, in turn, displaces substrate material outwardly through the mesh openings whereby the fabric is embedded in the outer surface of the reinforced section

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