Retractable trocar
First Claim
Patent Images
1. A trocar assembly comprising:
- (a) a primary base member;
(b) an elongate trocar mounted on the primary member for movement between extended and retracted positions relative thereto, said trocar having a proximal portion received in the base member and a pointed distal portion extending from the base member for the application of piercing force;
(c) biasing means to normally urge the trocar to the retracted position relative to the base member;
(d) latch means within the primary base member engageable with the proximal portion of the trocar to secure the trocar in the extended position against the urging of the biasing means; and
(e) release means within the primary base member for releasing the latch means upon the interruption of the application of piercing force to the distal portion of the trocar, wherein the release means includes a moveable member separate from the latch means.
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Accused Products
Abstract
A trocar is received in a trocar tube for movement relative to the tube between a position extended from the tube for piercing and a retracted position shielded by the tube. The trocar is mounted within a housing which carries a spring normally biasing the trocar to the retracted position. A latch mechanism within the housing is engageable with the trocar to maintain the trocar in the extended position. The latch mechanism senses the application of piercing force to the trocar and, upon the interruption of such force in response to the completion of a piercing operation, functions to release the trocar for retraction by the spring.
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Citations
29 Claims
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1. A trocar assembly comprising:
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(a) a primary base member; (b) an elongate trocar mounted on the primary member for movement between extended and retracted positions relative thereto, said trocar having a proximal portion received in the base member and a pointed distal portion extending from the base member for the application of piercing force; (c) biasing means to normally urge the trocar to the retracted position relative to the base member; (d) latch means within the primary base member engageable with the proximal portion of the trocar to secure the trocar in the extended position against the urging of the biasing means; and (e) release means within the primary base member for releasing the latch means upon the interruption of the application of piercing force to the distal portion of the trocar, wherein the release means includes a moveable member separate from the latch means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A trocar assembly comprising:
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(a) an elongate trocar received within a trocar tube for movement relative to the tube between a position extended from the tube for piercing and a retracted position shielded by the tube, said trocar having a groove formed in the proximal portion thereof; (b) a primary housing mounting the trocar for movement relative thereto between the extended and retracted positions; (c) biasing means carried by the housing to normally urge the trocar to the retracted position; (d) latch means within the housing engageable with the trocar to maintain the trocar in the extended position, said latch means being responsive to the application of piercing force to the trocar and functioning to release the trocar for retraction by the biasing means upon the interruption of such force; and (e) wherein the latch means comprises a plate carried by the primary housing for movement relative thereto between an extended condition engaged with the groove to secure the trocar in the extended position and a retracted condition disengaged from the groove to release the trocar for movement by the biasing means. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A trocar assembly comprising:
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a primary base member; a trocar mounted on the primary base member; a secondary base member mutually engageable with the primary base member; a trocar tube carried by the secondary base member for receiving the trocar upon mutual engagement of the primary and secondary base members; a valve in said secondary base member having spring biasing means thereon for closing the trocar tube when the trocar is removed from the tube; and pushbutton means on said secondary base member for opening said valve and thereby opening access to said trocar tube; wherein said spring means is a spring, and said valve further comprises a door and means pivotally connecting said door to said secondary base member; wherein said means pivotally connecting said door to said secondary base member comprises a shaft pivotally mounted in said secondary base member, and wherein said door is mounted on said shaft; wherein said pushbutton comprises a generally tubular boot open at one end, closed at the opposite end, and further including seal means for sealingly connecting said open end to said secondary base member. - View Dependent Claims (29)
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Specification