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Biopsy channel for endoscope

  • US 4,714,075 A
  • Filed: 02/10/1986
  • Issued: 12/22/1987
  • Est. Priority Date: 02/10/1986
  • Status: Expired due to Term
First Claim
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1. An endoscope including an insertion tube that is connected at its proximal end to a control housing and having a bendable steering unit for maneuvering a viewing head located at the distal end of the tube, the steering unit being located near the distal end of the insertion tube adjacent the viewing head, said endoscope further includinga lubricious biopsy channel passing through the inside of the insertion tube having a first tubular section contained within the steering unit that is joined to a second tubular section that passes back into the control housing,said first section being formed of a bendable heat softenable thermoplastic material that is encircled by open mesh metal fabric,said second section being formed of a stiffer plastic material that has a greater resistance to bending than the first section, andthe open mesh metal fabric having fibers that are at least partially embedded in the outer surface of the first section for reinforcing said section to prevent the section from closing when bent to a small radius.

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