Dilator to facilitate endoscope insertion into the body

  • US 4,449,532 A
  • Filed: 06/30/1981
  • Issued: 05/22/1984
  • Est. Priority Date: 07/08/1980
  • Status: Expired due to Term
First Claim
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1. A dilator for opening a path in the human body for the subsequent introduction of an endoscope shaft, said dilator having a distal end to enter the body, and a proximal end, comprising:

  • a probe comprising a stiff rod and a ball on the end of said rod; and

    a plurality of expansion tubes adapted sequentially to enlarge a path formed by the introduction of the probe, ball first, into the body, each said tube having an inside and an outside diameter, the outside diameter of one tube being substantially equal to the inside diameter of the next larger tube, whereby to permit a close sliding axial telescopic fit, said rod being within and extending beyond said expansion tubes whereby the path opened by the ball can be incrementally opened by pressing next sequential tubes toward said ball.

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