TeleHealth Module: Difference between revisions

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#REDIRECT [[TeleHealth_Hardware]]
=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.
* Good documentation needed, possibly via svg/javascript animations.
* 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
* The long, time consuming parts
** Getting approval from governmental and medical organizations.
** Providing an intuitive interface and a pictograph manual.
** Drivers, integration with [[Measure]], and construction of a usable [[TeleHealth Database]].

== 3 Electrode EKG ==
* How to do it
** The first part is the actual hardware part. A circuit, possibly USB powered, using op-amps, would amplify the signal received by the sensor array(of three to twelve electrodes in contact with the skin, in proximity to the heart), to a voltage usable by an ADC
** The second part is the safety part, due to the proximity to the heart, strict regulation of leakage current is needed.
** The third part is adapt [[Measure]] to increase functionality as a [[Telemedicine]] platform.

*Implementation
** 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 [http://media.maxim-ic.com/images/qv/3760.gif 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.
* Honza Kovar(Jan), from the Czech republic, has acquired development board for the C8051F321 MCU, and will assist with programing and development.

==THMDB==
[[TeleHealth Database]]

== Contributors ==
* Ian Daniher
* Honza Kovar
* Ram Dhurjaty (Simple concept suggested elsewhere)
* Rafael Ortiz
* Steve Burns

==Resources==
* http://www.olpcnews.com/use_cases/community/medical_application_community.html
* http://openeeg.sourceforge.net/doc/links-biopsy.html
* http://library.med.utah.edu/kw/ecg/
* http://www.uneca.org/itca/healthport/discussions.htm

[[Category:Hardware ideas]]
[[Category:Hardware]]
[[Category:Peripherals]]
[[Category:Health]]

Latest revision as of 00:27, 21 January 2008