Surgery – Truss – Pad
Patent
1989-10-27
1991-10-15
Jaworski, Francis
Surgery
Truss
Pad
128786, 128713, A61B 502
Patent
active
050565265
ABSTRACT:
The left ventricular catheter is adapted to be inserted into the heart and has an upstream heater winding near the distal catheter tip. Pulses of regulated electrical energy triggered by the R-wave of an electrocardiogram are supplied to the heater winding on the catheter so that successive heat energy is generated and dissipated in the blood volume of the left ventricle during successive diastoles. A resistance thermometer is mounted downstream from the heater winding to measure successive temperature increases as the heart beats over a 5-10 second measuring period, whereby a exponential temperature rise is recorded. To cancel deviation of temperature readings caused by heat dissipation from the lead wire conductors bypassing the thermometer to the catheter heater, lead wire conductors are provided to an external dummy load heater winding for bypassing the thermometer. By alternating high frequency electrical energy from the catheter heater winding during diastoles to the dummy load heater winding during systoles through the lead wire conductors, a constant environmental temperature is maintained for the thermometer to measure temperature rise after thermodilution for evaluation of the global ejection fraction during diagnostic and intervention catheterization.
REFERENCES:
patent: 3075515 (1963-01-01), Richards
patent: 4153048 (1979-05-01), Magrini
patent: 4576182 (1986-03-01), Norman
patent: 4856530 (1989-08-01), Vandervelden
Jaworski Francis
Manuel George
Vigil Thomas R.
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