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Plug device for endoscopic instrument channel

  • US 6,117,070 A
  • Filed: 11/26/1997
  • Issued: 09/12/2000
  • Est. Priority Date: 11/28/1996
  • Status: Expired due to Fees
First Claim
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1. A plug device for endoscopic instrument channel, comprising:

  • an outer shell member to be fitted in an entrance passage to an endoscopic instrument channel;

    a valve member formed of a resilient material and removably fitted in said shell member; and

    an instrument insertion passaged provided in and through said valve member and which is normally closed unless a treating instrument is inserted therein;

    said instrument insertion passage including;

    a slit wall portion located in an outermost portion of said instrument insertion passage, said slit wall portion being normally closed but being opened upon insertion of said treating instrument,an auxiliary pressure relief chamber provided on the inner side of said slit wall portion,a first throttle portion formed on the inner side of said first pressure relief chamber and having an open aperture area of a predetermined diameter,a main pressure relief chamber provided on the inner side of said first throttle portion,a main throttle portion provided on the inner side of said second pressure relief chamber, and including a flexible membrane having a smaller open aperture area than said first throttle portion, andsaid auxiliary pressure relief chamber forming an extended chamber of said main pressure relief chamber when a treating instrument having a predetermined diameter is inserted therein.

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