TeleHealth Module: Difference between revisions
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#REDIRECT [[TeleHealth_Hardware]] |
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=The 10usd TeleHealth Module= |
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* 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. |
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* 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. |
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* 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. |
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** See nirdiagnositics.com for other NIR functions |
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== 3 Electrode EKG == |
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* Uses |
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** This is an excellent way to help children learn about the behavior of the heart. |
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** Can be a way of prevent and diagnose diseases. |
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** Can be a way to recognize congenital defects of the heart. |
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* Key features |
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** Safety |
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** Low Cost |
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** Simplicity of interface |
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** Good documentation, possibly via svg/javascript animations. |
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* How to do it |
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** 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 level readable by the sound-card. |
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** The second part is the safety part, when we are dealing with the heart there is a very real risk of causing serious problems via current leakage. |
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** The third part is adapt [[Measure]] to increase functionality as a [[Telemedicine]] platform. |
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*** To increase interface functionality |
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*** To add software selections for pulse oximeter, EKG, to accommodate the difference in waveform type |
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*** To add diagnosis functionality |
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*** To add graphical depictions of biosign activity(heart-beat?) |
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*Implementation |
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** Multiple Op-Amps pick up, amplify, and filter electrical impulses picked up by near-heart electrodes. |
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*** Older EKGs used suction based reusable electrodes, an adaption of these may be best suited for the third world where replacements are scarce. |
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** DyD/DyDisMe has schematics for an EKG using AD620A style op-amps. |
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*** 4.1044-7.3 usd |
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** 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. |
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** Dirakx(Rafael Ortiz) is currently in the prototyping phase of an EKG, to incorporate into the THM, as of Nov. 14th of 2007 |
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** Now we have an excellent way to do an [http://en.wikipedia.org/wiki/Electrocardiogram ECG] measurement, through [[Measure]]. |
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*Extensions |
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** EEG - Electroencephalography |
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** EMG - Electromyography |
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** EOG - Electro-oculography |
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** SpO2 - Pulse-oximetry. |
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The long time consuming part |
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* Get approval from the health organizations. |
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== NIR Diagnosis Aid == |
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* Based on the principles of the differences in absorption of oxygenated and non oxygenated hemoglobin |
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* 800-1000nm light from LEDs are often used in NIR tools |
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** The most cited frequencies for IR Pulse Oximetery include 805nm, 910nm, and 940nm. |
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** 940nm IR LED; 12.2c per unit |
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* Red light is generated from similar LEDs. |
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** 10-20c per unit |
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* Light is picked up by photodiodes, converted to current. |
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* This current is amplified and converted to voltage by a [http://media.maxim-ic.com/images/qv/3760.gif MAX4006] or equivalent chip |
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** 1.275 usd |
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== ADC/DAC == |
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* C8051F321 or equivalent chip |
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** A/D 5x10b minimum |
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** This specific chip provides A/D 13x10b |
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* alternatively a USB micro-controller may communicate with dedicated ADC/DAC chips via PWM, to lower cost. |
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* Honza Kovar(Jan), from the Czech republic, has acquired development board for the C8051F321 MCU, and will assist with programing and development. |
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==THMDB== |
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[[TeleHealth Database]] |
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== Contributors == |
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* Ian Daniher |
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* Honza Kovar |
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* Ram Dhurjaty (Simple concept suggested elsewhere) |
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* Rafael Ortiz |
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* Steve Burns |
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==Resources== |
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* http://www.olpcnews.com/use_cases/community/medical_application_community.html |
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* http://openeeg.sourceforge.net/doc/links-biopsy.html |
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* http://library.med.utah.edu/kw/ecg/ |
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* [[Electrocardiogram]] |
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[[Category:Hardware ideas]] |
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[[Category:Hardware]] |
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[[Category:Peripherals]] |
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[[Category:Health]] |
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Latest revision as of 00:27, 21 January 2008
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