TeleHealth Module
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The 10usd TeleHealth Module
- This low cost, multifunction peripheral will provide a means through which the XO can relay valuable medical diagnostic data from the field to doctors many kilometers away.
- It will compose of a three lead EKG providing valuable information about the heart's electrical status, enabling diagnosis of congenital defects and various arrhythmias.
- It will also contain a multipurpose NIR diagnosis tool whose primary function is that of a pulse oximeter, providing information about the oxygen saturation of the blood.
- See nirdiagnositics.com for other NIR functions
3 Electrode EKG
- Multiple Op-Amps pick up, amplify, and filter electrical impulses picked up by near-heart electrodes.
- Older EKGs used suction based reusable electrodes, an adaption of these may be best suited for the third world where replacements are scarce.
- DyD/DyDisMe has schematics for an EKG using AD620A style op-amps.
- 4.1044-7.3 usd
- Ram Dhurjaty, a medical device professional who has had substantial experience with EKG amplifiers, has pointed suggested that there are better amplifiers than the AD620.
- Dirakx(Rafael Ortiz) is currently in the prototyping phase of an EKG, to incorporate into the THM, as of Nov. 14th of 2007
NIR Diagnosis Aid
- Based on the principles of the differences in absorption of oxygenated and non oxygenated hemoglobin
- 800-1000nm light from LEDs are often used in NIR tools
- The most cited frequencies for IR Pulse Oximetery include 805nm, 910nm, and 940nm.
- 940nm IR LED; 12.2c per unit
- Red light is generated from similar LEDs.
- 10-20c per unit
- Light is picked up by photodiodes, converted to current.
- This current is amplified and converted to voltage by a MAX4006 or equivalent chip
- 1.275 usd
ADC/DAC
- C8051F321 or equivalent chip
- A/D 5x10b minimum
- This specific chip provides A/D 13x10b
- alternatively a USB micro-controller may communicate with dedicated ADC/DAC chips via PWM, to lower cost.
http://wiki.laptop.org/go/Telehealth_module_database
THMDB
http://wiki.laptop.org/go/Telehealth_module_database
Contributors
- Ian Daniher
- Zdenek Broz
- Ram Dhurjaty (Simple concept suggested elsewhere)
- Rafael Ortiz