Biomedical Engineering Reference
In-Depth Information
FIGuRE 3.30
Three ultra-small silicon pressure transducers located on the head of a pin.
FIGuRE 3.31
Photograph of the CardioMEMS implantable wireless pressure transducer device.
Importantly, the device requires no power source since the external reader
merely scans the frequency spectrum and remotely detects when a reso-
nant frequency is obtained. This technology has been approved by the FDA
and is being marketed by CardioMEMS [55]. A photograph of the sensor
device is shown in Figure 3.31. The external reader used to wirelessly inter-
rogate the implanted wireless pressure sensor in shown in Figure 3.32.
There are many other applications for wireless pressure sensors. One exam-
ple is the monitoring of the pressure inside a patient's cranium in hydrocepha-
lus. Hydrocephalus is one of the most common birth defects, occurring in one
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