Objective for. System of Quality of Measure Life.
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Transcript of Objective for. System of Quality of Measure Life.
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Objective
for
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System of
Quality of
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Measure Life
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Team Members
Maja Middleton – Team LeaderKayla Ericson – Communicator
Kristin Riching – BSACKatherine Davis - BWIG
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ClientDr. Erwin B. Montgomery M.D.
Department of Neurology
AdvisorProf. Justin Williams
BME Department
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Problem Statement
• Design a system or tool to measure the quality of life for a patient suffering from movement disorders.
• The system/device must provide evidence that the quality of life has improved post surgery so that insurance companies will continue to fund deep-brain stimulus rehabilitation.
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Quality of Life• Definition: Quality of life is a measure of
the means that people live within their own environments in ways that are best for them
• Applicable Definition: The ultimate goal of deep brain stimulation surgery is to enable people to live quality lives -- lives that are both meaningful and enjoyed, but are also functional mentally, physically and socially.
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Three Aspects of Quality of Life
• Mental – Patient’s feelings and attitudes about themselves and their abilities as related to their disease and quality of life – Cognitive assessment (PADLS or MSQOL54)
• Physical – Patient’s ability to perform daily tasks – Bluetooth accelerometer
• Social – Patient’s daily interactions with society and personal relationships– GPS
All three aspects will be measured pre- and post-surgery
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Product Design SpecificationsPerformance Requirements
Repeated use, all types of patients, non-invasive, easy to operate
Safety Safe for patient and operator
Accuracy and Reliability Dependable, durable, precise, fulfill companies requirements for objective measure
Life in Service 7 days of operation and battery life, record tri-axial motion, 20 cycles per seconds (accelerometer)
Quantity Five (5) accelerometers Bluetooth enabled, one (1) PDA Bluetooth enabled, one (1) GPS CompactFlash card – one unit can be used for many repeated patients
Target Production Cost Approximately $1600
Ergonomics Light, non-invasive
Size Minimal, fitting watch or PDA (GPS)
Weight Not more than 750 grams (accelerometer)
Materials Hypo-allergenic for all types of patients
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Background Material and Research
Movement Disorder Symptoms• Rigidity• Postural Instability• Tremor• Bradykinesia / akinesia
– Slowness– Absence of movement
• Dyskinesia– Abnormal, involuntary
movement– Side effect of drug therapy
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Previous Methods
• No previous devices for objective measure of movement disorders found besides written questionnaires and doctor judgment.
• Doctor observation is becoming less accepted as insurance companies lean toward evidence based medicine
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Background Material and Research
• Insurance companies only pay for necessary rehabilitation treatments that bring the patient to a normal functioning level for their environment– They continue to fund treatments so
long as progress continues – All progress is marked on a scale that
relates to daily functions of life• Reaching, lifting, standing, walking, dressing, etc…
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Deep Brain Stimulation
• For neurologically based movement disorders
• Two electrodes implanted in the brain are fed to a pulse generator implanted in the chest
• The generator delivers high-frequency electrical stimulation that shuts down nerve cells to allow cells to regain self-control
Figure 1: http://www.clevelandclinic.org/neuroscience/techniques/dbs.htm
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Physical Design Specifications
•Accelerometers–5 subunits
•One for each wrist (2 total)•One for each ankle (2 total)•One on the trunk as a reference
–Bluetooth enabled•Allows for wireless messaging of data to the central PDA
Figure 2: Top picture - front view; bottom picture – back view
http://www.gvu.gatech.edu/ccg/resources/btacc/index.html
35 mm
35 mmDepth: 5mm
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Physical Technical Aspects • All accelerometers need to
communicate together – done via the PDA and Bluetooth technology
• Each signal must be recognized individually by the PDA (X, Y, Z data in ASCII format – number for a character)
• Will sample at 20 Hz (Nyquis’ Theorem)• Battery life (Lithium ion) is about 60
hours (840 mAh – 3.7V)• Has A-D conversion
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Central Integration Unit
•Hewlett Packard - Personal Desktop Assistant (PDA)
–Bluetooth enabled PDA–CompactFlash slot–Expansion slot in
PDA for memory capabilities–USB port for easy
PC interfacing
HP iPAQ2215
Figure 3: http://www.circuitcity.com/detail.jsp?c=1&b=g&u=c&qp=0&bookmark=bookmark_0&oid=74016&catoid=-8028&m=0
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Central Unit Technical Aspects• PDA
– 64 MB internal RAM– Up to 512 MB of add-on memory– 900 mAh lithium rechargeable battery– Software must be programmed for PDA
to record and store GPS data (every half hour)
– Software must also be programmed to receive, store, and manipulate accelerometer data
– All programming will be done using the software development kit (SDK) from Microsoft
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Social Design Specifications
• Laipac Global Positioning System (GPS)
–Tracking GPS compact flash card (to log distance and location)–Low power consumption–Windows compatible
Figure 4: http://www.laipac.com/gps_tf30cf_eng.htm
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Social Technical Aspects
• GPS– Record readings every half hour– Accurate to 25 m– 3.3 V– .2 W power consumption– PDA driver is downloadable from the
website
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Thank you!
•We just want to extend our thanks to:
•Dr. Montgomery•Prof. Justin Williams•Dr. Jim Abbs•Daryn Belden•Gary Diny, PT
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Future Work• The plan for the device is thoroughly
mapped out. The next steps include:– Purchasing the PDA and CompactFlash
card– Writing the software with the SDK for the
GPS– Purchasing the pieces for the
accelerometer – Purchasing the circuit board and
assembling the system– Design and build casing for the
accelerometers– Write software using the SDK for the
accelerometer– Test the integrated system
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Overall schematic
Accelerometer
Integrated PDA and GPS
Reference Accelerometer
Upload data to PC
Figure 5: www.circuitcity.com
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References
• Davis, William R. Personal Interview. 14 Feb. 2004.• Department of Neurology. (2001). What are Movement
Disorders and How are they Treated? Retrieved March 8, 2004, from Baylor College of Medicine Web site: http://www.bcm.tmc.edu/neurol/struct/park/park6.html
• Diny, Gary. Personal Interview. 27 Feb. 2004.• Hobson, J.P., et al., eds. “The Parkinson’s Disease
Activities of Daily Living Scale: a new simple and brief subjective measure of disability in Parkinson’s disease.” Clinical Rehabilitation 15:1 (2001): 241-246.
• Meyers, Allan R., et al., eds. “Health-Related Quality of Life in Neurology.” Neurology and Public Health 57:1 (2000): 1224-1227.
• Montgomery, Erwin B. Personal Interview. 27 Jan. 2004.• Deep Brain Stimulation surgery. Retrieved April 25, 2004.
http://www.clevelandclinic.org/neuroscience/techniques/dbs.htm
• Deep Brain Stimulation Surgery. Retrieved April 25, 2004. www.wemove.org