TeleHealth Module: Difference between revisions
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(Completely redid page to reflect current progress) |
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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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* Plugs into left USB, LineIn, LineOut |
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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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* USB for power |
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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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** USB ADC? |
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** See nirdiagnositics.com for other NIR functions |
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*** If so, AVR/Amtel is the way to go |
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*** http://www.atmel.com/dyn/resources/prod_documents/doc3302.pdf |
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== 3 Lead EKG == |
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*** http://www.atmel.com/dyn/resources/prod_documents/6120s.pdf |
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* Multiple Op-Amps pick up, amplify, and filter electrical impulses picked up by near-heart electrodes. |
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* Manual-Switched input selector |
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* DyD/DyDisMe has schematics for an EKG using 714 style op-amps. |
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* Comprised of |
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** [[Pulse Oximeter]] |
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== NIR Diagnosis Aid == |
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*** IR LED |
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* Based on the principles of the differences in absorption of oxygenated and non oxygenated hemoglobin |
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*** Red LED |
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* 800-1000nm light from LEDs are often used in NIR tools |
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*** Photodiode |
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* Red light is generated from similar LEDs. |
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*** Op-Amp Chain |
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** 5-15c ea |
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**** Outputs into line-in |
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* Light is picked up by photodiodes, converted to current. |
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** [[Stethoscope]] |
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* This current is amplified and converted to voltage by a [MAX4006|http://media.maxim-ic.com/images/qv/3760.gif] or equivalent chip |
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*** Audio pickup(mic) |
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** 1.275 usd |
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**** Outputs into line-in |
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== ADC/DAC == |
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**[[Blood Pressure Cuff]] |
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* C8051F321 or equivalent chip |
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*** Electroconstrictive polymer |
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** A/D 5x10b minimum |
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*** Audio pickup(mic) |
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** This specific chip provides A/D 13x10b |
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*** Audio amplifier |
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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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**** Outputs into line-in |
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** [[Electrocardiogram]] |
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*** Analog Filters |
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*** Op-Amp Chain |
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**** Outputs into line-in |
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** Digital [[Thermometer]] |
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*** Simple LM35 based circuit |
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** Digital [[Eye-Ear-Nose Camera]] |
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*** Plastic Fiber-optic attachment to XO's camera? |
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** [[Blood Chemistry Monitor]] |
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*** Glucose meter |
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==How To Do It== |
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* reuse Op-Amp Chains |
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** LM324 |
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* reuse Audio Amp circuits |
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** Patch into existing audio I/O channels? |
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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://www.avrfreaks.net/ |
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* http://www.nirdiagnostics.com/ |
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** A company specializing in NIR Diagnosis Aids |
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Revision as of 16:08, 31 October 2007
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 Lead EKG
- Multiple Op-Amps pick up, amplify, and filter electrical impulses picked up by near-heart electrodes.
- DyD/DyDisMe has schematics for an EKG using 714 style op-amps.
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
- Red light is generated from similar LEDs.
- 5-15c ea
- Light is picked up by photodiodes, converted to current.
- This current is amplified and converted to voltage by a [MAX4006|http://media.maxim-ic.com/images/qv/3760.gif] 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.