Trocar
First Claim
Patent Images
1. A surgical trocar comprising:
- a cannula handle, and a hollow cannula connected to said cannula handle;
an obturator handle comprising an obturator with a sharpened tip connected to said obturator handle, a shield with a proximal end connected to said obturator handle and a distal end, and spring means connecting said obturator to said obturator handle such that said obturator is slidable relative to said shield; and
control means attached to said obturator handle and interoperative with said spring means to generally urge said obturator tip past said shield distal end.
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Accused Products
Abstract
A safety trocar is provided which includes a spring-loaded shield that shields the cutting tip of the obturator after the obturator penetrates tissue. The distal end of the shield is hemispheric in profile and contains slides within cutting tip. The rounded distal end enables the shield to spring forward to shield the cutting tip as soon as the tip perforates the tissue. In other embodiments, positive mechanical means effect shielding.
347 Citations
26 Claims
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1. A surgical trocar comprising:
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a cannula handle, and a hollow cannula connected to said cannula handle; an obturator handle comprising an obturator with a sharpened tip connected to said obturator handle, a shield with a proximal end connected to said obturator handle and a distal end, and spring means connecting said obturator to said obturator handle such that said obturator is slidable relative to said shield; and control means attached to said obturator handle and interoperative with said spring means to generally urge said obturator tip past said shield distal end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A trocar comprising:
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an obturator having a sharpened tip; a shield capable of extending past said tip, said shield connected to said obturator and movable relative to said obturator; said tip connected by spring means to said shield; and positive placement means comprising a channel in said shield placed in mating relationship with a pin on said obturator wherein said channel contains a longitudinal portion for positively urging said pin away from said spring means, and a closure portion connected to said longitudinal portion operable by rotating said shield about said obturator such that said pin is guided within said closure portion to a position restricting longitudinal movement of said shield with said obturator. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification