Safety mechanism for trocar
First Claim
Patent Images
1. A trocar comprising:
- a trocar tube having a proximal end and a distal end, said tube proximal end connected to a trocar handle;
an obturator having a perforating tip and extendable through the tube to perforate tissue at the distal end of the tube;
a safety shield extendable to shield the tip of the obturator, said safety shield exhibiting a rounded distal end with a slot for passage of said obturator tip therethrough; and
wherein said shield and obturator are connected to a handle having a top and a bottom, and said handle comprising;
a first spring;
a securement plate for maintaining said shield and said obturator in a closed position wherein said shield encloses said obturator, said securement plate movable by said first spring into an open position wherein said obturator tip may be exposed; and
wherein said first spring comprises a retainment spring, said retainment spring pivoted about a pair of points on said handle such that when in said open position said retainment spring contacts said plate, and in said closed position said retainment spring rotates out of the path of said plate.
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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 a slot which conforms to the geometry of the cutting tip. Instead of using a discrete shield component the shielding function may be provided by spring-loading the trocar tube itself to spring forward and shield the obturator tip after the tip penetrates tissue. Alternately a safety mechanism insures the tip is covered by the shield after the tip penetrates tissue.
251 Citations
9 Claims
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1. A trocar comprising:
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a trocar tube having a proximal end and a distal end, said tube proximal end connected to a trocar handle; an obturator having a perforating tip and extendable through the tube to perforate tissue at the distal end of the tube; a safety shield extendable to shield the tip of the obturator, said safety shield exhibiting a rounded distal end with a slot for passage of said obturator tip therethrough; and wherein said shield and obturator are connected to a handle having a top and a bottom, and said handle comprising; a first spring; a securement plate for maintaining said shield and said obturator in a closed position wherein said shield encloses said obturator, said securement plate movable by said first spring into an open position wherein said obturator tip may be exposed; and wherein said first spring comprises a retainment spring, said retainment spring pivoted about a pair of points on said handle such that when in said open position said retainment spring contacts said plate, and in said closed position said retainment spring rotates out of the path of said plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification