Design, Development and in vivo Evaluation of a Wireless Platform for Intracranial Pressure Monitoring Using Inductive Passive Implants
Research output: Book/Report › Doctoral thesis › Collection of Articles
|Publisher||Tampere University of Technology|
|Number of pages||51|
|Publication status||Published - 9 Feb 2018|
|Publication type||G5 Doctoral dissertation (article)|
|Name||Tampere University of Technology. Publication|
Over the past few decades, there has been increasing number of research in the development of fully passive pressure sensors for biomedical applications. Although the previous studies advanced the possibility of wireless pressure readout across the tissue, further development is required to translate the concept to clinically approved devices. In this research work, a complete system for biotelemetric wireless ICP monitoring was designed, developed and evaluated through in vitro and in vivo studies. The proposed system includes an ICP implant, which is wirelessly interrogated by a hand-held external reader. The external reader communicates with the implant through separated wireless channels for concurrent excitation of the implant and collection of the received signal from the sensor. The simultaneous transmit and receive operation is realized through a novel dual-port planar antenna. The reader device is connected to a host PC through a Bluetooth link. The proposed system provides real-time monitoring of the ICP through a dedicated interactive PC software.
The in vivo performance of the implant was evaluated in a canine model. The findings of the in vivo study are consistent with the theoretical analysis of the proposed telemetry scheme as well as the data obtained from the in vitro experiments. The capability of the wireless pressure readout and detection of in vivo ICP variation has been proved through the animal study and the in vivo data was verified using a commercial ICP monitor. The promising outcome of the in-body assessment of the system indicates that the proposed platform can be further developed and potentially used in real-life clinical trials for early detection of increasing ICP in patients with traumatic brain injuries and chronic intracranial hypertension. In addition, the same platform with further modification and customization can be used for other biomedical applications.