Surgical sealing surfaces and methods of use

Details Surgical sealing surfaces and methods of use Surgical sealing surfaces and methods of use

2007-05-22

2007-05-22

Robinson, Daniel (Department: 3742)

Electric heating

Capacitive dielectric heating

Specific heating application

C607S096000

Reexamination Certificate

active

11110363

ABSTRACT:
Various embodiments provide compositions that exhibit positive temperature coefficient of resistance (PTCR) properties for use in thermal interactions with tissue—including thermal sensing and I2R current-limiting interactions. Embodiments also provide tissue-engaging surfaces having PTCR materials that provide very fast switching times between low resistance and high, current-limiting resistance. One embodiment provides a matrix for an electrosurgical energy delivery surface comprising a PTCR material and a heat exchange material disposed within an interior of the matrix. The PTCR material has a substantially conductive state and a substantially non-conductive state. The heat exchange material has a structure configured to have an omni-directional thermal diffusivity for exchanging heat with the PTCR material to cause rapid switching of the PTCR material between the conductive state and non-conductive state. Preferably, the structure comprises a graphite foam having an open cell configuration. The matrix can be carried by tissue contacting surfaces of various electrosurgical devices.

REFERENCES:
patent: 659409 (1900-10-01), Mosher
patent: 1586645 (1926-06-01), Bierman
patent: 1798902 (1931-03-01), Raney
patent: 1881250 (1932-10-01), Tomlinson
patent: 2031682 (1936-02-01), Wappler et al.
patent: 3685518 (1972-08-01), Beuerle et al.
patent: 3730188 (1973-05-01), Ellman

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