TROCAR ENTRY INCORPORATING AN AIRBAG
First Claim
Patent Images
1. An airbag cannula comprising:
- a cannula having a housing and an elongate tubular member extending distally from the housing;
an expandable member positioned on the elongate tubular member proximal of a distal end of the elongate tubular member, the expandable member movable from a collapsed position to an expanded position;
a sensor including a sensor lumen formed through the elongate tubular member and having a sensor opening adjacent to the distal end of the elongate tubular member; and
a trigger mechanism operatively associated with the sensor and the expandable member such that a change of condition sensed at the sensor opening operates to move the expandable member from the collapsed to the expanded position.
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Abstract
A safety trocar assembly incorporating an airbag is provided to prevent overpenetration of the safety trocar assembly through an abdominal wall and into a body cavity. The safety trocar assembly includes an airbag cannula having an expandable airbag proximal of the distal end of the cannula. A sensing device is located at a distal end of the cannula for detecting changes in conditions at the distal end of the cannula. A trigger mechanism is provided on the cannula and operates to inflate the airbag in response to a change in condition detected by the sensing device.
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Citations
20 Claims
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1. An airbag cannula comprising:
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a cannula having a housing and an elongate tubular member extending distally from the housing; an expandable member positioned on the elongate tubular member proximal of a distal end of the elongate tubular member, the expandable member movable from a collapsed position to an expanded position; a sensor including a sensor lumen formed through the elongate tubular member and having a sensor opening adjacent to the distal end of the elongate tubular member; and a trigger mechanism operatively associated with the sensor and the expandable member such that a change of condition sensed at the sensor opening operates to move the expandable member from the collapsed to the expanded position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An airbag cannula comprising:
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a cannula having a housing and an elongate tubular member extending distally from the housing; an expandable member positioned on the elongate tubular member proximal of a distal end of the elongate tubular member, the expandable member movable from a collapsed position to an expanded position; a sensor including a pair of sensor wires extending through the elongate tubular member and terminating in a pair of spaced apart sensor tips adjacent to the distal end of the elongate tubular member; and a trigger mechanism operatively associated with the sensor and the expandable member such that a change of condition sensed between the sensor tips operates to move the expandable member from the collapsed to the expanded position. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method of preventing overpenetration of the distal end of a cannula into an abdominal cavity comprising:
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providing a cannula having a housing and an elongate tubular member extending distally from the housing; an airbag positioned on the elongate tubular member, the elongate tubular member including an inflation lumen in fluid communication with the airbag, the airbag positioned on the elongate tubular member proximal of a distal end of the elongate tubular member, the airbag movable from a collapsed position to an expanded position; a sensor including a sensor lumen fowled through the elongate tubular member and having a sensor opening adjacent to the distal end of the elongate tubular member; and a trigger mechanism operatively associated with the sensor and the airbag, the trigger mechanism including a valve to inflate the airbag in response to a change in conditions detected by the sensor such that a change of condition sensed at the sensor opening operates to move the airbag from the collapsed to the expanded position; positioning the distal end of the elongate tubular member adjacent and abdominal wall such that the sensor opening is sealed against the abdominal wall; sensing a first condition at the sensor opening; advancing the distal end of the elongate tubular member through the abdominal wall and into an abdominal cavity; sensing a second condition at the sensor opening; and inflating the airbag from the collapsed position to the expanded position in response to a change in condition between the first condition and the second condition sensed at the sensor opening.
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Specification