Electric field and temperature probe
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United States of America Patent
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May 19, 1992
Grant Date -
N/A
app pub date -
Apr 29, 1988
filing date -
Apr 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A catheter is used to insert a probe into a tumor undergoing hyperthermia treatment. The probe is designed to isotropically measure the electric field and temperature in the tumor during the hyperthermia treatment. The probe is constructed on a triangular prism and includes a dipole on each prism face oriented at an angle of 54.74 degrees relative to the axis of the prism. Each dipole includes rectifier means therein and the three dipoles are coupled serially using high resistivity lead means. In addition, high resistivity leads are used to couple the dipoles to a high input impedance amplifier. A pair of thermistors are coupled between the three dipoles, and high resistance lead means couple the thermistors to high input impedance amplifiers. A current source is used to provide current to the thermistors in a time shared manner when the electric field is not being measured. The probe may have a pair of beryllium oxide or diamond layers attached to the ends thereof against which the thermistors may be positioned. With the above construction, the total electric field may be measured as well as the temperature at two locations.
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