Title: Objective for
1Objective for
2 System of Quality of
3Measure Life
4Team Members
- Maja Middleton Team Leader
- Kayla Ericson Communicator
- Kristin Riching BSAC
- Katherine Davis - BWIG
5- Client
- Dr. Erwin B. Montgomery M.D.
- Department of Neurology
- Advisor
- Prof. Justin Williams
- BME Department
6Problem 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.
7Quality 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.
8Three Aspects of Quality of Life
- Mental Patients feelings and attitudes about
themselves and their abilities as related to
their disease and quality of life - Cognitive assessment (PADLS or MSQOL54)
- Physical Patients ability to perform daily
tasks - Bluetooth accelerometer
- Social Patients daily interactions with
society and personal relationships - GPS
- All three aspects will be measured pre- and
post-surgery
9Product Design Specifications
10Background 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
11Previous 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
12Background 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
13Deep 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/neuroscie
nce/techniques/dbs.htm
14Physical 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
35 mm
Depth 5mm
35 mm
Figure 2 Top picture - front view bottom
picture back view http//www.gvu.gatech.edu/ccg/
resources/btacc/index.html
15Physical 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
16Central 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
1bgucqp0bookmarkbookmark_0oid74016catoi
d-8028m0
17Central 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
18Social 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
19Social 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
20Thank you!
- We just want to extend our thanks to
- Dr. Montgomery
- Prof. Justin Williams
- Dr. Jim Abbs
- Daryn Belden
- Gary Diny, PT
21Future 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
22Overall schematic
Reference Accelerometer
Integrated PDA and GPS
Upload data to PC
Accelerometer
Figure 5 www.circuitcity.com
23References
- 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/s
truct/park/park6.html - Diny, Gary. Personal Interview. 27 Feb. 2004.
- Hobson, J.P., et al., eds. The Parkinsons
Disease Activities of Daily Living Scale a new
simple and brief subjective measure of disability
in Parkinsons disease. Clinical Rehabilitation
151 (2001) 241-246. - Meyers, Allan R., et al., eds. Health-Related
Quality of Life in Neurology. Neurology and
Public Health 571 (2000) 1224-1227. - Montgomery, Erwin B. Personal Interview. 27 Jan.
2004. - Deep Brain Stimulation surgery. Retrieved April
25, 2004. http//www.clevelandclinic.org/neuroscie
nce/techniques/dbs.htm - Deep Brain Stimulation Surgery. Retrieved April
25, 2004. www.wemove.org