In 1983, Bill Cook and Dr. Neal Fearnot began to work under the Cook Pacemaker Company in Leechburg, PA on developing the technology developed by Dr. Fearnot at Purdue University into an improved prototype for a temperature-based exercise responsive pacemaker that was released in 1988 as the Kelvin Sensor rate-responsive pacemaker. One of the first CVT rate-adaptive pacemakers was the Cook Model Kelvin 500 series.
Temperature-sensing pacemakers did not gain wide acceptance, mostly because of their specialized, rather unreliable sensing lead. The last CVT-sensing pacemaker in production (ca. 1994) was the Cook Sensor model 510.
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A very detailed engineering discussion on CVT-sensing pacemakers is available at Mayotte MJ. “Rate adaptation by temperature.” In: Webster JG, ed. Design of Cardiac Pacemakers. IEEE Press, Piscataway, NJ, 1995: 335–368.