Electrosurgical instrument and method of use

Details Electrosurgical instrument and method of use Electrosurgical instrument and method of use

A - Human Necessities

61

B

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

Patent

CA 2733138

An electrosurgical medical device and method (Fig. 8A) for creating thermal welds in engaged tissue. In one embodiment, at least one jaw of the instrument defines a tissue engagement plane carrying a conductive-resistive matrix of a conductively-doped non-conductive elastomer. The engagement surface portions thus can be described as a positive temperature coefficient material that has a unique selected decreased electrical conductance at each selected increased temperature thereof over a targeted treatment range. The conductive-resistance matrix can be engineered to bracket a targeted thermal treatment range, for example about 60°C to 80°C, at which tissue welding can be accomplished. In one mode of operation, the engagement plane will automatically modulate and spatially localize ohmic heating within the engaged tissue from Rf energy application-across-micron-scale portions of the engagement surface (155A). In another mode of operation, a conductive-resistive matrix can induce a "wave" of Rf energy density to sweep across the tissue to thereby weld tissue

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