Transcript Programmable Chest Exerciser

Programmable Biofeedback
Chest Exerciser
Group 23:
Eileen Bock, Lauren Cassell,
Margaret Gipson, Laurie McAlexander
Advisors:
Douglas Sawyer, M.D., Ph.D.
Paul King, Ph.D.
John Newman, M.D.
Heart Failure and Its Treatment
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Statistics
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Affects 5 million Americans
50% mortality rate within 4
years of diagnosis
•Benefits of exercise as treatment
•Improves vascular function
•Improves muscle function
•Reduces arrythmia risk
•Benefits of deep breathing as
exercise
•Targets muscles of chest wall
•Not as difficult for patients
Pathology
Heart doesn’t pump nutrients to
tissues efficiently
Heart can’t develop pressure to
eject needed stroke volume
Other Possible Applications
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Device may not be able to generate enough
force to exercise chest wall
Suggested to look into other applications
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Exercise monitor
Breathing monitor
Patient-specific use
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46 yo female experiences sudden drops in P O2 –
stops breathing
Breathing patterns normal while sleeping
Dr. Newman wants to use device to remind patient to
breathe
Current Devices
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Incentive Spirometer
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Blow into mouthpiece
Cost: $10 -$1000
Problems:
Must be stationary
during use
 Large, awkward shape
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Pneumotrace
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Measures chest expansion
Cost: $200
Problems:
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Must be lying down for use
Very complex device
Current Devices
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RESPeRATE
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Tells patient when to breathe
via headphones
Cost: $330
Problems:
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Must wear headphones
Must carry additional device
VivoMetrics LifeShirt
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Measures chest expansion and
heart rate
Cost: Not Available for sale
Problems:
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Large Device
Uncomfortable to wear
Very conspicuous
Vandy REx
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Measures chest expansion
Cost: less than $100 without PDA
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$14 for stretch sensor
$18 for batteries and op amps
Why it’s better:
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No additional devices
Comfortable to wear
Small and inconspicuous
Approach
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Bridge
Differential amplifier
Bend Sensor
Voltage threshold
detector
Rs/R2=R3/R1
Design
Acquired components:
 Voltage source
 Low power
Operational Amplifier
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Adjustable inelastic
band
Elastic section
Strain gauge/bend
sensor
PDA for digital output
DAQ system
Motor for vibration
Testing
Part 1
 10 subjects wear the
device for 1 hour
each
 Subject will perform
breathing exercises
and various common
activities
 Subject survey
Part 2
 Previous 10 subjects
will return and wear
device for 3 hours
 Subject survey
Testing
Part 3
 Clinical testing: requires another IRB
protocol submission
 2 control groups, 1 experimental group
 Measure improvement of negative
inspiratory force with incentive
spirometer
Tidal Volume Experiments
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Determine
relationship between
chest circumference
and lung volume
Determine the output
voltage of the device
during a normal and a
deep breath
Measurements used
to adjust resistor
ratings and gain
Expected Results
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Output voltage correlates to lung volume
Deep breath threshold will correspond to a
given output voltage
If threshold not reach in a predetermined
time period, alarm will sound
Expect that the use of this device will
increase lung capacity and force of
expiration from lungs
Tidal Volume Results
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3.5
y = 1.1539x + 0.3692
R2 = 0.8503
Exhaled Air (L)
3
2.5
2
1.5
1
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0.5
0
0
0.5
1
1.5
2
Chest Expansion (cm)
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4
y = 0.8493x + 0.6736
R2 = 0.842
Exhaled Air (L)
3.5
3
2.5
2
1.5
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1
0.5
0
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0
0.5
1
1.5
2
2.5
Chest Expansion
3
3.5
4
Graphs show relationship
between exhaled air and
chest expansion
Data from 2 group
members
Shows what constitutes
deep breaths
May have to calibrate for
each person
Breath greater than 500
mL needed for detection
Resources
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REST1 Impedance Pneumograph by UFI.
http://www.ufiservingscience.com/ DSRsp11.html
"How to Use an Incentive Spirometer". The Cleveland Clinic Foundation.
<http://www.clevelandclinic.org/health/healthinfo/docs/0200/0239.asp?index= 4302& src=news>.
"Anaesthesia Products," Lifeline Systems Pvt. Ltd.
<http://www.lifelinedelhi.com/ catheter-mount.html>
"RESPeRATE High Blood Pressure and Hypertension." Buyamag.
<http://www.buyamag.com/high_blood_pressure_hypertension.php>.
"Smart textiles at Hightex 2005". Hightex 2005.
<http://www.hightex2005.com/smart_textiles.htm>.
“Learning to Whistle”. November 2005.
<http://learningtowhistle.blogspot.com/2005_11_01_learningtowhistle_arch
ive.html>.
http://www.answers.com/topic/lung