Design Concept & Technical Requirements Chest Component

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