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In-vivo Blood Pressure Sensor

In-vivo Blood Pressure Sensor. Anup Pillai Dhanya Premkumar Nair. Background. Long-Term Implantable Blood Pressure Monitoring System Wireless Battery less In VIVO Blood Pressure Sensing Micro system. Objective. The sensor specified earlier exhibits increased noise levels

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In-vivo Blood Pressure Sensor

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  1. In-vivo Blood Pressure Sensor Anup Pillai Dhanya Premkumar Nair

  2. Background • Long-Term Implantable Blood Pressure Monitoring System • Wireless Battery less In VIVO Blood PressureSensing Micro system

  3. Objective • The sensor specified earlier exhibits increased noise levels • The transmitter of the same dissipated 80% of the system power • Our objectives are: a) To find a solution that will exhibit less noise levels b) To find ways of having a more power efficient transmitter for the sensor

  4. Timelines

  5. Objective 1 • To find a solution which exhibits less noise levels • We began by investigating the reason for the high noise levels in the current design

  6. Reason for noise • Animal body vapor penetration into the device • Affect the functioning of the electrical connections within the sensor.

  7. The in vivo blood pressure sensor inside an actual lab rat

  8. The damage caused • The high impedance node can be highly sensitive to vapor penetration • Electrical connections between the sensor diaphragm and IC chip

  9. Solution proposed • Protection for moisture penetration is required for the sensor diaphragm as well as the electrical connections between the sensor diaphragm and IC chip.

  10. Solution proposed: • A passivation layer, such as silicon dioxide (SiO2) and silicon nitride (Si3N4), can be deposited on the top of diaphragm. • An encapsulant material with strong moisture resistance can be used to protect the bond wires between the sensor and IC before applying silicone passivation layer.

  11. Conclusion • Improve packaging methods • This will enhance the reliability of the micro system for long-term blood pressure monitoring

  12. References • http://etd.ohiolink.edu/view.cgi/Cong%20Peng.pdf?case1228412139 - “Wireless Battery less in Vivo Blood Pressure Sensing Microsystem for Small Laboratory Animal Real-Time Monitoring” Cong, Peng • http://filer.case.edu/djy/publications/Sensor-04-BP.pdf -“Novel Long-Term Implantable Blood Pressure Monitoring System” Peng Cong, Darrin J. Young, and Wen H. Ko • http://resources.metapress.com/pdf-preview.axd?code=t331767305362515&size=largest – “Fibre optic sensors in biomedical sciences” Otto S. Wolfbeis • “Biosensors for real-time in vivo measurements” -George S. Wilson,  and Raeann Gifford

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