Universal seal for trocar assembly
First Claim
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1. A trocar assembly for providing communication into an anatomical cavity, comprising:
- (a) a trocar tube defining an interior lumen having an open distal end portion and an open proximal end portion for accommodating axial reciprocation of an elongate implement of lesser cross-sectional dimension therethrough;
(b) means adjoining said proximal end portion of said trocar tube defining a chamber having open distal and proximal end portions that communicate with said lumen and permit axial reciprocation of such an elongate implement therethrough;
(c) seal means positioned in said chamber, said seal means having a generally hourglass shape defining generally converging and diverging side walls that form a constricted center bore portion therebetween allowing an elongate implement to pass therethrough in sealing engagement therewith, said seal means sealing said proximal end portion of said chamber(d) compressing means for compressing said center bore portion so as to reduce the inner diameter thereof, said compressing means applying a twisting force to said seal means.
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Abstract
Trocar assembly devices are disclosed that include an improved seal assembly that accommodates instruments having a wide range of diameters. The seal assembly includes a universal seal member that is generally of hourglass shape defining converging and diverging side walls that form a constricted center bore portion therebetween. Various alternative means are provided to either increase or decrease the inner diameter of the center bore portion of the seal member.
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Citations
9 Claims
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1. A trocar assembly for providing communication into an anatomical cavity, comprising:
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(a) a trocar tube defining an interior lumen having an open distal end portion and an open proximal end portion for accommodating axial reciprocation of an elongate implement of lesser cross-sectional dimension therethrough; (b) means adjoining said proximal end portion of said trocar tube defining a chamber having open distal and proximal end portions that communicate with said lumen and permit axial reciprocation of such an elongate implement therethrough; (c) seal means positioned in said chamber, said seal means having a generally hourglass shape defining generally converging and diverging side walls that form a constricted center bore portion therebetween allowing an elongate implement to pass therethrough in sealing engagement therewith, said seal means sealing said proximal end portion of said chamber (d) compressing means for compressing said center bore portion so as to reduce the inner diameter thereof, said compressing means applying a twisting force to said seal means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification