Radio Frequency Thermothermai With The Single Cavity Center Ductus Venosus Temperature Measurement Of The Feasibility Study

Objective:In the clinical hyperthermia temperature meas-ureement catheter is sometimes needed to advance into the treatment site, and then the catheter through the preset temperature measurement. Intraperitoneal chemotherapy for patients with hyperthermia, the patient's own abdominal cavity has been carrying the perfusion catheter. So when in the use of radiofrequency hyperthermia, can temperature by intrap-eritoneal perfusion catheter line temperature, and abdominal perfusion catheter what is the extent of the temperature is not yet clear. Through this project sets a single lumen central venous catheter sensor (experimental group) and the casing of the sensor without (control group) on the water temperature, body core temperature and the cancer patients die in the pots of hyperthermia, abdominal temperature contrast associated measurement and identification experiments of single lumen central venous catheters and abdominal temperature whether the impact factors to guide the intraperitoneal chemotherapy in patients when the temperature radiofrequency hyperthermia, in order to address the problem of clinical hyperthermia temperature. Methods:Single lumen central venous catheter for the thermal conductivity was identified, a preliminary study using a single lumen central venous catheter temperature is feasible. The sensor head temperature sensor (control group) and set a single-lumen central venous catheter sensor head temperature sensor (experimental group) immersed in water, the vertical water container (water temperature about 50℃), water containers placed in ice block, so that the water temperature inside the container from the surface (temperature about 50℃) to bottom (about 0℃and the temperature) decreased in the vertical plane to form a horizontal temperature gradient and only a flat vertical temperature field. Single-lumen central venous catheter through the inside and outside the sensor head through two sensors 45℃～36℃when the temperature gradient difference between the temperature readings to verify the single-lumen central venous catheter sensors measuring the temperature inside the tube horizontal level can represent near the point of the true temperature. Without magnetic fields and uniform thermal field, that the insulation cup of water at different temperatures to identify the single chamber temperature measurement of central venous catheters on whether the impact of temperature sensors. Perpendicular to the magnetic field and uniform thermal field, the RF heating of phantom phantom center temperature measurements to identify the single lumen central venous catheters on whether the impact of temperature sensors. Cancer patients in clinical hyperthermia on pots, abdominal temperature measurements to identify the single lumen central venous catheters on whether the impact of temperature sensors. Results:Single lumen central venous catheter, the sensor head outside through the two sensors 45℃～36℃when the temperature gradient difference of temperature readings agree within 0.1℃; in the absence of magnetic field, thermal field uniformity of water temperature monitoring sites for each via central venous catheter temperature and temperature from the temperature sensor directly to the maximum relative error is 0.3℃, but the difference was not statistically significant (P> 0.05); phantom RF heating process, the two sensors and the magnetic field perpendicular to, and at the same a hot venue, through the central venous catheter temperature and the temperature from the temperature sensor directly to the maximum relative error is 0.3℃, but the difference was not statistically significant (P> 0.05); basin, the process of peritoneal hyperthermia through central venous tube temperature and the temperature sensor from direct temperature measurement was no significant difference between (P> 0.05), only in the individual time zones, individual temperature measurement points have a greater measurement error. Conclusion:At 45℃～36℃temperature gradient inside, single lumen central venous catheter in the heat conduction effects can be neglected; in various temperature points, sets of a central venous catheter sensors measured temperature value to accurately reflect the catheter outside the horizontal level near organizational point of the real temperature; in drainage region RF heating, the RF hyperthermia is safe; cancer basin, abdominal RF heating process, the single lumen central venous catheter had no significant effect of temperature sensors in the individual time zone individual temperature measurement points have larger error may be the direction of the magnetic field, thermal field distribution in the different relevant.