Electrosurgical instrument reducing thermal spread

Details Electrosurgical instrument reducing thermal spread Electrosurgical instrument reducing thermal spread

A - Human Necessities

61

B

A61B 18/14 (2006.01) A61B 17/28 (2006.01) A61B 18/12 (2006.01)

Patent

CA 2443246

An electrosurgical instrument which includes opposing end effectors and a handle for effecting movement of the end effectors relative to one another. The instrument includes a housing and a pair of electrodes. Each electode preferably includes an electrically conductive surface (e.g., which can be dimensioned for sealing, clamping and/or cutting) and an insulating substrate which is dimensioned to be engageable with the end effectors such that the electrodes reside in opposing relation relative to one another. The dimensions of the insulating substrate are different from the dimensions of the electrically conductive surface to reduce thermal spread to adjacent tissue structures. The insulating substrate is made from a material having a Comparative Tracking Index of about 300 volts to about 600 volts to reduce the incidence of flashover.

L'invention concerne un instrument électrochirurgical qui comprend des effecteurs terminaux opposés et une poignée destinée à réaliser le mouvement de ces effecteurs les uns par rapport aux autres. L'instrument comporte un logement et une paire d'électrodes, chacune comportant une surface électro-conductrice (par exemple, que l'on peut dimensionner pour suturer, pincer et/ou couper) et un substrat isolant dimensionné pour venir en contact avec les effecteurs terminaux de façon que les électrodes soient disposées à l'opposé l'une de l'autre. Les dimensions du substrat isolant diffèrent de celles de la surface électro-conductrice, ce qui permet de réduire la propagation thermique vers des structures tissulaires contiguës. Le substrat isolant est à base d'un matériau ayant un indice comparatif de résistance à l'érosion se situant entre environ 300 volts et environ 600 volts pour réduire l'incidence du contournement.

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