bwsn accelerometer - sintef
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BWSN AccelerometerJani MäkipääArto Rantala
Wireless biomedical sensors at the hospitalFeb 8th 2008
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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Outline
• VTT• Heart acceleration monitoring method• Acceleration monitoring vs. other methods• BWSN solution• Chip integration• Future possibilities
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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VTT – Finnish National Research Center
• State operated scientific research institute• Academic and commercial research
• Scientific knowhows include• Electronics and ICT• Chemistry• Biotechnologies• Material technology
• BWSN project• VTT Sensors center, a national center of excellence• Knowhows include: smart sensors, micro mechanical systems,
nanophysics, RFsystems, integrated circuits
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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Heart Acceleration Monitoring
• Accelerometer is sutured to the heart
• Acceleration monitoring gives real time myocardial information
• Hearts acceleration changes indicate disturbed blood flow to myocardium
• Beat to beat detection of Beat to beat detection of regional myocardial ischemiaregional myocardial ischemia
• Instant occlusion indication!Instant occlusion indication!
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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Acceleration Method vs. Other Methods
• More sensitive than• EKG• Hemodynamic monitoring
• Constant monitoring possible• Not possible for echogardiography or angiocardiography
• Added value: facilitation of local detection of parenchymal ischemia• Instant response• Invasive!• Signal processing requirements!
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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BWSN Heart Acceleration Monitoring
• Heart acceleration monitoring during surgery
• Commercial accelerometer• 3 axis• ± 2 g
• Biocompatible molding and wiring
• Integration with BWSN wireless monitoring system
• Mechanical problems: both sensor and plug end
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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Future IC Implementation
• Integration of VTT MEMS and readout electronics
• Challenges:• Form factor critical• Packaging, chip scale• Attachment• Developing costs
• Benefits:• Monitoring during surgery,
transportation and after surgery treatment
➔ Full time heart monitoring!Full time heart monitoring!
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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Holistic Heart Monitoring
VTT TECHNICAL RESEARCH CENTRE OF FINLAND
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Future Possibilities
• Total integration• Onchip processing
• Reduced bandwidth• Smart alerts• Cost effective
• Neural network• Adaptive system• Reduced power
• Multiple parameter monitoring• Better predictability
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