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Design Concept & Technical Requirements
Chest Component
Required Functionality
• Determines heart rate continuously• Records EKG statistics• Records body temperature• Determines if user suffers a severe impact e.g. falls, vehicle
collisions• Communicates information to wrist component• Central processing unit interprets data and determines if
there is need for medical assistance
Technical Requirements
• Ideal weight range 250-500g– About the weight of a men’s shirt
• Ideal power usage 4-6W– The same usage as an iPhone 4G– With an equivalent battery, should only require charging at night
• No more than 2cm thick– Will be nearly invisible underneath a sweater or a loose shirt
• Under $100 to make
Exterior Design
Primary Electronic Components in Plastic Casing
AdjustableElastic Band
Optional Shoulder Supports
Necessary Components
• EKG Sensors
• Accelerometer• Thermometer
• CPU, Communications
iPhone CPU, Components
Power, Weight Breakdown
• Power 4-6W– EKG - approx. 50mW– Accelerometer < 25mW– Processing (at 1GHz) - approx. 4W
• Weight 250-500g– EKG - approx. 17g– Accelerometer < 1g– Thermometer < 1g– Processor and wireless transmitter < 50g– Plastic casing, straps < 100g– Battery < 100g
Research paper on low-cost, low-weight EKG sensors and tech:http://www.eecs.umich.edu/~prabal/teaching/eecs598-w10/readings/PCB+06.pdf
Cost Breakdown
• EKG sensors and module– Most expensive component and based on current retail costs can run
up to $75 to produce. – Maybe have redundancies with processor than can be reduced
• Wireless technology, processor– The costs of these components have all been driven down due to
mass manufacturing in smart phones. On one chip, these will probably cost only $30 to mass produce.
• Accelerometer, Thermometer – Less than $0.50 to buy
• Straps and casing– Less than $2 to make/ buyEKG Sales (pricing info):
http://bio-medical.com/products/thought-technology-ecgekg-sensorwith-wrist-straps.html
iPhone information:http://www.radphone.info/apple-iphone-3g3gsipad-parts-datasheets-componentschematicsdiagram-and-info/
Risks
• Cost– The biggest risk to this project is the cost of the components
• The EKG equipment is extremely expensive• Further research may be required to eliminate cost by reducing redundancy with
central processor
– Processor• Ideally, we will be able to use components like wireless technology,
accelerometers, flash memory and CPU that have been driven down in cost by the production of smart phones
• Power– Integration of components may require more power than anticipated
• Battery may end up being bulky, heavy or expensive