Oval-shaped cardiac cannula
First Claim
1. An improved cannula for use in conducting fluid to or from a body, the cannula comprising a cannula body having a proximal end, a distal end, a lumen extending between the proximal and distal ends, a fluid outlet formed on the proximal end and at least one fluid inlet formed adjacent the distal end, the improvement comprising:
- a cannula body wherein the cross section of a first portion of the cannula body is non-circular and has a major cross-sectional axis and a minor cross-sectional axis, the length of the major axis being greater than the length of the minor axis and the lumen extending through said first portion of the cannula body having a cross-sectional shape the same as the cross section of the first portion of the cannula body; and
a second portion of the cannula body which is non-circular, said second portion having a major cross-sectional axis and a minor cross-sectional axis, the length of the major axis being greater than the length of the minor axis, the major and minor axes of the first and second portions, respectively, being non-parallel.
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Abstract
A cannula comprises a proximal end, a distal end, and a lumen extending between the proximal and distal ends, wherein at least a portion of the cannula body is non-circular in cross section, preferably oval. A cannula wherein a portion of the cannula body is oval in cross section is ideally suited in surgical procedures wherein the cannula extends through a percutaneous aperture. The oval portion of the cannula body utilizes the space of the percutaneous aperture efficiently, thereby minimizing the necessary size of the access aperture.
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Citations
17 Claims
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1. An improved cannula for use in conducting fluid to or from a body, the cannula comprising a cannula body having a proximal end, a distal end, a lumen extending between the proximal and distal ends, a fluid outlet formed on the proximal end and at least one fluid inlet formed adjacent the distal end, the improvement comprising:
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a cannula body wherein the cross section of a first portion of the cannula body is non-circular and has a major cross-sectional axis and a minor cross-sectional axis, the length of the major axis being greater than the length of the minor axis and the lumen extending through said first portion of the cannula body having a cross-sectional shape the same as the cross section of the first portion of the cannula body; and a second portion of the cannula body which is non-circular, said second portion having a major cross-sectional axis and a minor cross-sectional axis, the length of the major axis being greater than the length of the minor axis, the major and minor axes of the first and second portions, respectively, being non-parallel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of positioning a fluid conducting cannula in a body comprising the steps of:
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providing a cannula comprising; a cannula body having a proximal end, a distal end, a lumen extending between the proximal and distal ends, a fluid outlet formed on the proximal end, and at least one fluid inlet formed adjacent the distal end, the cross section of a first portion of the cannula body being non-circular and having a major cross-sectional axis and a minor cross-sectional axis, the length of the major axis being greater than the length of the minor axis; and an obturator telescopically received in the lumen of the cannula, the obturator comprising a proximal end, a distal end and a radially expandable foam member mounted on the distal end of the obturator, the foam member being sufficiently pliable so that the foam member can be telescopically received in the cannula lumen and effectively seal at least a portion of the at least one fluid inlet when the obturator is received in the cannula lumen; providing a percutaneous aperture in a body; inserting the distal end of the cannula into the body through the percutaneous aperture; and positioning the cannula so that the non-circular first portion of the cannula extends through the percutaneous aperture. - View Dependent Claims (14, 15, 16)
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17. A method of positioning a fluid conducting cannula in a body comprising the steps of:
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providing a cannula comprising; a cannula body having a proximal end, a distal end, a lumen extending between the proximal and distal ends, a fluid outlet formed in the proximal end and at least one fluid inlet formed adjacent the distal end, wherein the cross section of a first portion of the cannula body is non-circular and has a major cross-sectional axis and a minor cross-sectional axis, the length of the major axis being larger than the length of the minor axis, and the lumen extending through said first portion of the cannula body having a configuration substantially similar to the cross section of the first portion of the cannula body; and an obturator telescopically received in the lumen of the cannula, the obturator comprising a proximal end, a distal end, and a foam member mounted on the distal end, the foam member being sufficiently pliable so that the foam member can be telescopically received in the cannula lumen and effectively seal at least a portion of the at least one fluid inlet when the obturator is fully received in the cannula lumen; providing a percutaneous aperture in a body; inserting the distal end of the cannula into the body through the percutaneous aperture; and positioning the cannula so that the non-circular first portion of the cannula extends through the percutaneous aperture.
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Specification