Trocar
First Claim
1. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising a handle, an obturator with a point for piercing the wall of the body cavity, and a protective sleeve mounted concentrically around the obturator, the obturator retracting proximally relative to the handle generally simultaneously as the protective sleeve advances distally relative to the handle after the trocar point has penetrated through the wall of the body cavity.
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Accused Products
Abstract
A pneumatically powered trocar assembly includes a source of compressed gas which releases a metered amount of gas to a chamber. A piston slidably positioned within the chamber is driven forward by the compressed gas introduced therein, and an obturator with a tissue piercing tip are advanced thereby. Optionally, a sensor detects the presence of body tissue within the cutting path of the tip and blocks the passage of compressed gas to the chamber, or alternatively, opens an escape vent to release compressed gas therefrom if insufficient body tissue resistance is encountered. The powered trocar assembly is intended for use in conjunction with a cannula assembly to create a passage to the interior of a body cavity for conducting surgical procedures.
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Citations
21 Claims
- 1. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising a handle, an obturator with a point for piercing the wall of the body cavity, and a protective sleeve mounted concentrically around the obturator, the obturator retracting proximally relative to the handle generally simultaneously as the protective sleeve advances distally relative to the handle after the trocar point has penetrated through the wall of the body cavity.
- 3. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar having a housing, an obturator with a point for piercing the wall of the body cavity, and a protective sleeve mounted concentrically around the obturator, and means for retracting the obturator proximally relative to the housing at approximately the same time the protective sleeve advances distally relative to the housing after the trocar point has penetrated through the wall of the body cavity.
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9. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising:
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a handle;
an obturator extending distally from the handle and having a point on its distal end for piercing the wall of the body cavity;
a protective sleeve mounted concentrically around the obturator for axial movement relative to the obturator, and resiliently biased distally so that the protective sleeve can retract proximally relative to the obturator in response to drag from the wall of the body cavity as the trocar point is advancing through the wall of the body cavity, and can advance distally after the cannula has penetrated through the wall of the body cavity and reduced the drag on the protective sleeve; and
means for retracting the obturator relative to the handle generally at the same time the protective sleeve advances distally relative to the handle after the trocar point has penetrated through the wall of the body cavity. - View Dependent Claims (10, 11)
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12. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising:
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a handle;
an obturator extending distally from the handle and having a point on its distal end for piercing the wall of the body cavity;
a protective sleeve mounted concentrically around the obturator for axial movement relative to the obturator, and resiliently biased distally so that the protective sleeve can retract proximally relative to the obturator in response to drag from the wall of the body cavity as the trocar point is advancing through the wall of the body cavity, and can advance distally after the cannula has penetrated through the wall of the body cavity and reduced the drag on the protective sleeve;
biasing means for biasing the obturator proximally relative to the protective sleeve;
means for releasably securing the obturator from proximal retraction under the bias of the biasing means; and
means for releasing the releasable securing means upon the proximal retraction of the protective sleeve that occurs while the trocar is advancing through the wall of the body cavity, and the subsequent distal advancement of the protective sleeve that occurs after the cannula has penetrated through the wall of the body cavity.
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13. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising a housing, an obturator with a point for piercing the wall of the body cavity, and a member mounted adjacent the obturator, the obturator retracting proximally relative to the housing in response to the member advancing distally relative to the housing.
- 14. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising a housing, an obturator with a point for piercing the wall of the body cavity, and a tubular member mounted concentrically around the obturator, the tubular member defining a distal portion which is adapted to extend beyond the cannula, the obturator retracting proximally relative to the housing generally simultaneously as the tubular member advances distally relative to the housing.
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16. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar having a housing, an obturator with a point for piercing the wall of the body cavity, and a member mounted adjacent the obturator, and means for retracting the obturator proximally relative to the housing at approximately the same time the member advances distally relative to the housing.
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17. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar having a housing, an obturator with a point for piercing the wall of the body cavity, and a member mounted adjacent the obturator, and means for retracting the obturator proximally relative to the housing at approximately the same time the member advances distally relative to the housing after the trocar point has penetrated through the wall of the body cavity.
- 18. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar having a housing, an obturator with a point for piercing the wall of the body cavity, and a tubular member mounted concentrically around the obturator, the tubular member defining a distal portion which is adapted to extend beyond the cannula, and means for retracting the obturator proximally relative to the housing at approximately the same time the tubular member advances distally relative to the housing after the trocar point has penetrated through the wall of the body cavity.
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20. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising:
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a handle;
an obturator extending distally from the handle and having a point on its distal end for piercing the wall of the body cavity;
a member mounted adjacent the obturator for axial movement relative to the obturator, the member being resiliently biased distally;
wherein the member is adapted to retract proximally relative to the obturator in response to drag from the wall of the body cavity and to advance distally after the cannula has penetrated through the wall of the body cavity, and wherein the obturator is adapted to move proximally in response to distal movement of the member.
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21. A trocar for placement in the lumen of a cannula to facilitate inserting the cannula through the wall of a body cavity, the trocar comprising:
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a handle;
an obturator extending distally from the handle and having a point on its distal end for piercing the wall of the body cavity;
a tubular member mounted concentrically around the obturator for axial movement relative to the obturator, the tubular member being resiliently biased distally;
wherein the tubular member is adapted to retract proximally relative to the obturator in response to drag from the wall of the body cavity and to advance distally after the cannula has penetrated through the wall of the body cavity, and wherein the obturator is adapted to move proximally in response to distal movement of the tubular member.
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Specification