Invivo Blood Pressure Sensor Anup Pillai Dhanya Premkumar

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 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

Timelines February Research project topic and preparatio n for report 1 Report 1 Objective 1 Presentatio n 2 Objective 2 Final Report March April May

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 Animal body vapor penetration into the device Affect the functioning of the electrical connections within the sensor.

The in vivo blood pressure sensor inside an actual lab rat

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

Solution proposed: A passivation layer, such as silicon dioxide (Si. O 2) and silicon nitride (Si 3 N 4), 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 Improve packaging methods This will enhance the reliability of the micro system for long-term blood pressure monitoring

References http: //etd. ohiolink. edu/view. cgi/Cong%20 Peng. pdf? case 1228 412139 - “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/pdfpreview. axd? code=t 331767305362515&size=largest – “Fibre optic sensors in biomedical sciences” Otto S. Wolfbeis “Biosensors for real-time in vivo measurements” -George S. Wilson, and Raeann Gifford