Figure 1.
Cross-section of a model of the modified hip implant with a metal head.
The temperature telemetry with thermistor, electronic circuit and power/data coil are placed inside the neck of the implant.
Figure 2.
Principle of the temperature telemetry.
Energy and temperature data are transferred through the titanium implant by induction.
Figure 3.
The power coil with GMR sensor are fixed near the patient’s hip and connected to the external device TELETEMP.
Figure 4.
Screen shot from test measurements. Left: pulse signal from implant. Marked peak values and time points for counting temperature-dependent pulse intervals. Right: sudden temperature increase in a water bath.
Figure 5.
The implants were calibrated in a circulating water bath at temperatures between 23°C and 58°C.
Figure 6.
The temperature-dependent signals of 5 implants are plotted.