Programmable Programmable Biofeedback Chest Biofeedback Chest
ExerciserExerciserGroup 23:Group 23:
Eileen Bock, Lauren Cassell, Eileen Bock, Lauren Cassell, Margaret Gipson, Laurie McAlexanderMargaret Gipson, Laurie McAlexander
Advisors:Advisors:Douglas Sawyer, M.D., Ph.D.Douglas Sawyer, M.D., Ph.D.
Paul King, Ph.D.Paul King, Ph.D.John Newman, M.D.John Newman, M.D.
Heart Failure and Its Heart Failure and Its TreatmentTreatment
StatisticsStatistics Affects 5 million AmericansAffects 5 million Americans 50% mortality rate within 4 50% mortality rate within 4
years of diagnosisyears of diagnosis
PathologyPathologyHeart doesn’t pump nutrients Heart doesn’t pump nutrients to to tissues efficientlytissues efficientlyHeart can’t develop pressure Heart can’t develop pressure toto eject needed stroke volumeeject needed stroke volume
•Benefits of exercise as Benefits of exercise as treatmenttreatment
•Improves vascular functionImproves vascular function•Improves muscle functionImproves muscle function•Reduces arrythmia riskReduces arrythmia risk
•Benefits of deep breathing Benefits of deep breathing as as exerciseexercise
•Targets muscles of chest Targets muscles of chest wallwall•Not as difficult for patientsNot as difficult for patients
Other Possible ApplicationsOther Possible Applications
Device may not be able to generate Device may not be able to generate enough force to exercise chest wallenough force to exercise chest wall
Suggested to look into other applicationsSuggested to look into other applications Exercise monitorExercise monitor Breathing monitorBreathing monitor
Patient-specific usePatient-specific use 46 yo female experiences sudden drops in P 46 yo female experiences sudden drops in P
O2 – stops breathingO2 – stops breathing Breathing patterns normal while sleepingBreathing patterns normal while sleeping Dr. Newman wants to use device to remind Dr. Newman wants to use device to remind
patient to breathepatient to breathe
Current DevicesCurrent Devices Incentive SpirometerIncentive Spirometer
Blow into mouthpieceBlow into mouthpiece Cost: $10 -$1000 Cost: $10 -$1000 Problems: Problems:
Must be stationary Must be stationary
during useduring use Large, awkward shapeLarge, awkward shape
PneumotracePneumotrace Measures chest expansionMeasures chest expansion Cost: $200Cost: $200 Problems:Problems:
Must be lying down for useMust be lying down for use Very complex deviceVery complex device
Current DevicesCurrent Devices
RESPeRATERESPeRATE Tells patient when to breathe Tells patient when to breathe via headphonesvia headphones Cost: $330Cost: $330 Problems:Problems:
Must wear headphonesMust wear headphones Must carry additional deviceMust carry additional device
VivoMetrics LifeShirtVivoMetrics LifeShirt Measures chest expansion and Measures chest expansion and heart rateheart rate Cost: Not Available for saleCost: Not Available for sale Problems:Problems:
Large DeviceLarge Device Uncomfortable to wearUncomfortable to wear Very conspicuousVery conspicuous
Vandy RExVandy REx
Measures chest expansionMeasures chest expansion Cost: less than $100 without PDACost: less than $100 without PDA
$14 for stretch sensor$14 for stretch sensor $18 for batteries and op amps$18 for batteries and op amps
Why it’s better:Why it’s better: No additional devicesNo additional devices Comfortable to wearComfortable to wear Small and inconspicuousSmall and inconspicuous
ApproachApproach
BridgeBridge Differential Differential
amplifieramplifier Bend SensorBend Sensor Voltage threshold Voltage threshold
detectordetector
RRss/R/R22=R=R33/R/R11
DesignDesign
Adjustable inelastic Adjustable inelastic bandband
Elastic sectionElastic section Strain gauge/bend Strain gauge/bend
sensorsensor PDA for digital PDA for digital
outputoutput DAQ systemDAQ system Motor for vibrationMotor for vibration
Acquired Acquired components:components:
Voltage sourceVoltage source Low power Low power
Operational Operational AmplifierAmplifier
TestingTesting
Part 1Part 1 10 subjects wear 10 subjects wear
the device for 1 the device for 1 hour eachhour each
Subject will Subject will perform breathing perform breathing exercises and exercises and various common various common activitiesactivities
Subject surveySubject survey
Part 2Part 2 Previous 10 Previous 10
subjects will return subjects will return and wear device and wear device for 3 hoursfor 3 hours
Subject surveySubject survey
TestingTestingPart 3Part 3 Clinical testing: requires another Clinical testing: requires another
IRB protocol submissionIRB protocol submission 2 control groups, 1 experimental 2 control groups, 1 experimental
groupgroup Measure improvement of negative Measure improvement of negative
inspiratory force with incentive inspiratory force with incentive spirometerspirometer
Tidal Volume ExperimentsTidal Volume Experiments
Determine Determine relationship between relationship between chest circumference chest circumference and lung volumeand lung volume
Determine the output Determine the output voltage of the device voltage of the device during a normal and during a normal and a deep breatha deep breath
Measurements used Measurements used to adjust resistor to adjust resistor ratings and gainratings and gain
Expected ResultsExpected Results
Output voltage correlates to lung volumeOutput voltage correlates to lung volume Deep breath threshold will correspond to Deep breath threshold will correspond to
a given output voltagea given output voltage If threshold not reach in a predetermined If threshold not reach in a predetermined
time period, alarm will soundtime period, alarm will sound Expect that the use of this device will Expect that the use of this device will
increase lung capacity and force of increase lung capacity and force of expiration from lungsexpiration from lungs
Tidal Volume ResultsTidal Volume Results
Graphs show relationship Graphs show relationship between exhaled air and between exhaled air and chest expansionchest expansion
Data from 2 group Data from 2 group membersmembers
Shows what constitutes Shows what constitutes deep breathsdeep breaths
May have to calibrate for May have to calibrate for each personeach person
Breath greater than 500 Breath greater than 500 mL needed for detectionmL needed for detection
y = 1.1539x + 0.3692
R2 = 0.8503
0
0.5
1
1.5
2
2.5
3
3.5
0 0.5 1 1.5 2
Chest Expansion (cm)
Exh
aled
Air
(L
)
y = 0.8493x + 0.6736
R2 = 0.842
0
0.5
1
1.5
2
2.5
3
3.5
4
0 0.5 1 1.5 2 2.5 3 3.5 4
Chest Expansion
Exh
aled
Air
(L
)
ResourcesResources
REST1 Impedance Pneumograph by UFI. REST1 Impedance Pneumograph by UFI. http://www.ufiservingscience.com/ DSRsp11.htmlhttp://www.ufiservingscience.com/ DSRsp11.html
"How to Use an Incentive Spirometer". The Cleveland Clinic "How to Use an Incentive Spirometer". The Cleveland Clinic Foundation. Foundation. <http://www.clevelandclinic.org/health/health-info/docs/0200/0239<http://www.clevelandclinic.org/health/health-info/docs/0200/0239.asp?index= 4302& src=news>. .asp?index= 4302& src=news>.
"Anaesthesia Products," Lifeline Systems Pvt. Ltd. "Anaesthesia Products," Lifeline Systems Pvt. Ltd. <http://www.lifelinedelhi.com/ catheter-mount.html><http://www.lifelinedelhi.com/ catheter-mount.html>
"RESPeRATE High Blood Pressure and Hypertension." Buyamag. "RESPeRATE High Blood Pressure and Hypertension." Buyamag. <http://www.buyamag.com/high_blood_pressure_hypertension.ph<http://www.buyamag.com/high_blood_pressure_hypertension.php>.p>.
"Smart textiles at Hightex 2005". Hightex 2005. "Smart textiles at Hightex 2005". Hightex 2005. <http://www.hightex2005.com/smart_textiles.htm>.<http://www.hightex2005.com/smart_textiles.htm>.
““Learning to Whistle”. November 2005. Learning to Whistle”. November 2005. <http://learningtowhistle.blogspot.com/2005_11_01_learningtowhi<http://learningtowhistle.blogspot.com/2005_11_01_learningtowhistle_archive.html>.stle_archive.html>.
http://www.answers.com/topic/lung http://www.answers.com/topic/lung
Top Related