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A portable modular diagnostic medical device. The medical device is based on a portable multipurpose computerized platform, such as those designed primarily for playing video games. A medical component such as a cartridge is removably connected to the platform, and has specialized circuitry specific

A portable modular diagnostic medical device. The medical device is based on a portable multipurpose computerized platform, such as those designed primarily for playing video games. A medical component such as a cartridge is removably connected to the platform, and has specialized circuitry specific to a predetermined diagnostic medical function, such as the monitoring of electrocardiograms (ECGs). Different medical functionality is provided for by removably connecting different components into the portable multipurpose computerized platform.

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[ I claim:] [1.] A portable and modular electrocardiogram (ECG) medical device comprising:a preprogrammed cartridge comprising:a housing;a connector partially disposed within the housing;a plurality of leads, each lead detecting a lead signal;an analog circuit to measure an ECG from the plurality of

[ I claim:] [1.] A portable and modular electrocardiogram (ECG) medical device comprising:a preprogrammed cartridge comprising:a housing;a connector partially disposed within the housing;a plurality of leads, each lead detecting a lead signal;an analog circuit to measure an ECG from the plurality of leads;a digital circuit for digitizing the ECG into ECG data and to send the ECG data through the connector regarding the ECG means for storing predetermined ECG function software; and,a portable hand-held multipurpose computerized base unit comprising:a second housing;a slot disposed within the second housing such that the connector of the preprogrammed cartridge is removably insertable within the slot;a display screen disposed within the second housing and for displaying the ECG data as a waveform according to a predetermined scale factor;a select control disposed within the second housing to toggle a lead signal displayed on the display screen, the lead signal comprising the lead signal of one of the plurality of leads of the preprogrammed cartridge;a joy pad disposed within the second housing and having left, right, up and down arrow keys, the left and the right arrow keys to change the scale factor of the ECG waveform as displayedon the display screen;an option menu displayed on the display screen in conjunction with the waveform of the ECG and having a plurality of options regarding the ECG and selectable via the up and the down arrow keys of the joy pad, the plurality of options including:a calibration control option to calibrate an amplitude of the waveform of the ECG against a predetermined reference voltage; anda second digital circuit within the second housing for receiving the ECG function software and for programming and controlling the base unit, display screen, select control, joypad, and option menu according to the software.