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| Remote unit for controlling the operation of a television receiver |
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Trocar-cannula device
| Details |
Inventors: Gentelia, John S.; Longo, Sharyn E.; Bowers, Thomas F.;
Assignee: Conmed Corporation (Utica, NY)
Primary Examiner: Buiz; Michael Powell
Assistant Examiner: Tao; Ellen S.
Attorney, Agent or Firm: Larson & Taylor
A trocar device, comprising a trocar cutting element, a surrounding insulating sheath, and a cannula surrounding the sheath, also includes an arrangement providing a substantially smooth transition between the sheath and cannula at the distal end of the cannula during the insertion of the trocar device into a patient so as to reduce drag on the device at the transition. In one embodiment, the sheath includes a shaped portion of enlarged diameter, and the cannula includes, at the distal end thereof, inwardly directed slits forming corresponding resilient leaf members which engage the shaped portion to provide the smooth transition. The shaped portion includes oppositely tapered surfaces meeting at a common apex. In another embodiment, an expandable section, when expanded, provides the smooth transition. |
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DETAILED DESCRIPTION In accordance with the invention, a trocar device is provided which comprises a trocar cutting element such as an electrosurgical cutting element, an insulating sheath surrounding the cutting element, a cannula surrounding the sheath and having an inner diameter greater than the outer diameter of the sheath, and transition means for providing a substantially smooth transition between the sheath and cannula at the distal end of the cannula during the insertion of the trocar device into a patient so as to reduce drag on the device at the transition.
According to one preferred embodiment, the sheath includes a shaped portion of enlarged diameter, and the cannula includes, at the distal end thereof, a plurality of inwardly directed slits forming a plurality of resilient leaf members which engage the shaped portion to provide said smooth transition and which, in cooperation with the shaped portion, enable withdrawal of the sheath.
Preferably, the shaped portion includes first and second oppositely tapered surfaces meeting at a common apex of said enlarged diameter.
In a further advantageous implementation, the sheath device further comprises means for providing a further smooth transition between the cutting element and the sheath at the distal end of the sheath.
In this implementation, the trocar element also includes a shaped portion of enlarged diameter, and the sheath includes, at the distal end thereof, a plurality of inwardly directed slits forming a plurality of resilient leaf members which engage the shaped portion of the trocar element to provide said further smooth transition.
Preferably, the shaped portion of the trocar element also includes first and second oppositely tapered surfaces meeting at a common apex of enlarged diameter.
In a further preferred embodiment, the transition means includes expandable means for, when expanded, providing said smooth transition.
Advantageously, the expandable means includes a resilient annular element of a low durometer material, preferably a rubber grommet
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