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Selectable seal cannula

  • US 5,211,633 A
  • Filed: 06/24/1992
  • Issued: 05/18/1993
  • Est. Priority Date: 06/24/1992
  • Status: Expired due to Term
First Claim
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1. A surgical cannula, comprising:

  • a tubular member insertable into a medical patient and having a side wall defining a lumen through which a medical device is to be inserted;

    a housing mounted to a proximal end of said tubular member, wherein said housing has a passage allowing insertion of a medical device therethrough and into said lumen;

    a movable member mounted to said housing and selectively movable between a first position, a second position and a third position across said passage, wherein when said movable member is in said first position said passage accommodates insertion of a first medical device having a first outer cross-sectional dimension;

    a first valve body mounted in said movable member and having a first opening therein corresponding in size to an outer cross-sectional dimension of a smaller second medical device, wherein said first opening is smaller than said passage, and wherein when said movable member is in said second position said first valve body provides a fluid tight seal around said second medical device; and

    a second valve body mounted in said movable member and having a second opening therein corresponding in size to an outer cross-sectional dimension of a smaller third medical device, wherein said second opening is smaller than said first opening, and wherein when said movable member is in said third position said second valve body provides a fluid tight seal around said third medical device.

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