Selectable seal cannula
First Claim
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.
1 Assignment
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Accused Products
Abstract
A surgical cannula with selectable seals which assure a fluid-tight fit around medical devices of a variety of sizes. The cannula includes a tubular member insertable into a medical patient and having a side wall defining a lumen through which a medical device may be inserted. The cannula also includes a housing mounted to a proximal end of the tubular member wherein the housing has a passage allowing insertion of a medical device therethrough and into the lumen. A movable member is mounted to the housing and is selectively movable between a first position and a second position across the passage. When the movable member is in its first position the passage accommodates insertion of a first medical device having a first outer cross-sectional dimension. A first valve body is mounted in the movable member and has a first opening therein corresponding in size to the outer cross-sectional dimension of a smaller second medical device, wherein the first opening is smaller than the passage. When the movable member is in its second position the first valve body provides a fluid tight seal around the second medical device.
255 Citations
12 Claims
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1. A surgical cannula, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification