Safety trocar
First Claim
Patent Images
1. A trocar comprising:
- (a) a cannula assembly comprising a cannula and a cannula housing defining an internal cannula passage;
(b) a trocar assembly adapted to cooperate with said cannula assembly, said trocar assembly comprising a sharp trocar tip, an obturator shaft, a trocar housing, and obturator sleeve means fixedly secured relative to said trocar housing and extending distally therefrom to surround said obturator shaft and at least a portion of said trocar tip, said trocar tip and at least a portion of each of said obturator shaft and said obturator sleeve means configured and dimensioned for entry into said internal cannula passage;
(c) releasable obturator means associated with said obturator shaft which releasably maintains said trocar tip in an extended position relative to said cannula;
(d) means for releasing said releasable obturator means; and
(e) biasing means for retracting said trocar tip from said extended position to a retracted position in response to release of said releasable obturator means, whereby said obturator sleeve means surrounds said obturator shaft and at least a portion of said trocar tip prior to entry of said trocar tip and said obturator shaft into said internal cannula passage.
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Abstract
A safety trocar is provided in which the cutting tip is withdrawn into the cannula in response to counterforce being removed from the cutting tip, e.g., by the tip entering a body cavity. The cutting tip is maintained in the exposed positioned by a mechanism associated with the obturator shaft, and is automatically withdrawn into the cannula under the force of a spring when the first mechanism is released by a second mechanism associated with the obturator. Penetration force is maintained at a minimum and safe and efficacious trocar entry is facilitated.
147 Citations
34 Claims
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1. A trocar comprising:
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(a) a cannula assembly comprising a cannula and a cannula housing defining an internal cannula passage; (b) a trocar assembly adapted to cooperate with said cannula assembly, said trocar assembly comprising a sharp trocar tip, an obturator shaft, a trocar housing, and obturator sleeve means fixedly secured relative to said trocar housing and extending distally therefrom to surround said obturator shaft and at least a portion of said trocar tip, said trocar tip and at least a portion of each of said obturator shaft and said obturator sleeve means configured and dimensioned for entry into said internal cannula passage; (c) releasable obturator means associated with said obturator shaft which releasably maintains said trocar tip in an extended position relative to said cannula; (d) means for releasing said releasable obturator means; and (e) biasing means for retracting said trocar tip from said extended position to a retracted position in response to release of said releasable obturator means, whereby said obturator sleeve means surrounds said obturator shaft and at least a portion of said trocar tip prior to entry of said trocar tip and said obturator shaft into said internal cannula passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A trocar comprising:
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(a) a cannula assembly comprising a cannula and a cannula housing defining an internal cannula passage; (b) a trocar assembly adapted to cooperate with said cannula assembly, said trocar assembly comprising a shaft trocar tip, and obturator shaft, obturator sleeve means fixedly secured relative to said trocar housing and surrounding said obturator shaft and at least a portion of said sharp trocar tip, an outer trocar housing and an inner trocar housing, said inner trocar housing and outer trocar housing being reciprocally mounted to each other, said trocar tip and at least a portion of said obturator shaft and said obturator sleeve means being configured and dimensioned for entry into said internal cannula passage; (c) releasable obturator means associated with said obturator shaft which releasably maintains said trocar tip in a first extended position relative to said cannula; (d) means for releasing said releasable obturator means; and (e) biasing means for retracting said trocar tip to a second retracted position in response to release of said releasable obturator means. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A method for inserting a trocar, comprising:
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(a) providing a cannula assembly comprising a cannula and a cannula housing defining an internal cannula passage, and a trocar assembly adapted to cooperate with said cannula assembly, said trocar assembly comprising a sharp trocar tip, an obturator shaft, obturator sleeve means fixedly secured relative to said trocar housing and surrounding said obturator shaft and at least a portion of said sharp trocar tip, said trocar tip and at least a portion of said obturator shaft and obturator sleeve means being configured and dimensioned for entry into said internal cannula passage; (b) inserting said obturator shaft, obturator sleeve means and trocar tip into said internal cannula passage; (c) advancing said obturator shaft and said trocar tip to expose said trocar tip from said cannula, said trocar tip being maintained in said exposed position by releasable obturator means associated with said obturator shaft which cooperates with said obturator sleeve means; (d) pressing said trocar tip in said exposed position against a body wall, said body wall thereby exerting a counterforce against said trocar tip; (e) entering said trocar tip into a body cavity, thereby removing said counterforce from said trocar tip and actuating release means associated with said obturator shaft to release said releasable obturator means, whereby said trocar tip is automatically withdrawn into said cannula under the action of a biasing means. - View Dependent Claims (33, 34)
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Specification