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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

In-vivo Blood Pressure Sensor

Anup Pillai

Dhanya Premkumar Nair


Background
Background

  • Long-Term Implantable Blood Pressure Monitoring System

  • Wireless Battery less In VIVO Blood PressureSensing Micro system


Objective
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



Objective 1
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


Reason for noise
Reason for noise

  • Animal body vapor penetration into the device

  • Affect the functioning of the electrical connections within the sensor.



The damage caused
The damage caused

  • The high impedance node can be highly sensitive to vapor penetration

  • Electrical connections between the sensor diaphragm and IC chip


Solution proposed
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.


Solution proposed1
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.


Conclusion
Conclusion

  • Improve packaging methods

  • This will enhance the reliability of the micro system for long-term blood pressure monitoring


References
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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