04449528 is referenced by 117 patents and cites 14 patents.

A miniaturized, endoscopically deliverable thermal cautery probe for cauterizing internal vessels. The probe is applied to tissues cold, and a large number of electric heating pulses of equal energy are then applied to an internal heating element in the probe. The probe has an internal heating element in direct thermal contact with an active heat-transfer portion that has a low heat capacity to insure quick heating and subsequent cooling, thereby adequately coagulating tissue while minimizing heat penetration and resulting tissue damage. The electrical power applied to the probe is continuously measured and is terminated when the energy delivered reaches a preset value. The number of such pulses applied to the probe (and hence the total energy delivered) may be preset while the duration of the period during which the pulses were applied is displayed. Alternatively, the duration of the period during which such pulses are applied to the probe may be preset while the number of pulses applied (and hence the total energy delivered) is displayed. The heating element for the probe is a controlled breakdown diode which has a breakdown voltage that is a function of its temperature so that the temperature can be controlled. The heating element has a resistance of greater than 0.5 ohm to provide adequate power dissipation with relatively low currents. A washing fluid, preferably flowing along the outside of the probe toward its tip, cleans blood from the tissue to be coagulated to make the source of blood more readily visible.

Title
Fast pulse thermal cautery probe and method
Application Number
131897
Publication Number
4449528
Application Date
July 20, 1981
Publication Date
May 22, 1984
Inventor
Tim R Majoch
Tacoma
WA, US
Dale M Lawrence
Lynnwood
WA, US
David C Auth
Bellevue
WA, US
Agent
Seed and Berry
Assignee
University of Washington
WA, US
IPC
A61B 17/36
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