Electrocardiograph with digitally-printing waveform display
First Claim
Patent Images
1. An electrocardiograph for connection to sensors outputting analog electrical signals, comprising:
- at least one sensor outputting analog electrical signals;
sampling means for selectively sensing at intervals at least one of such analog signals from at least one of said sensors;
analog to digital conversion means for receiving said sampled analog signals and outputting digitized signals corresponding thereto;
memory means including a plurality of addresses for storage of data therein;
processor means for writing said consecutively sampled digitized signals representative of a predetermined duration of the at least one analog sensor output signal into said addresses of said memory means for storage therein in consecutive order;
printer means for recording on a print medium in response to digital data input thereto, said processor means being further adapted to automatically read said stored date from said addresses in said memory means in said consecutive order and input said data to said printer means for printing a series of portions of a curve representative of the analog signal from said at least one sensor, said printer means being adapted to advance said print medium after printing each said curve portion, a cardiogram of said predetermined duration of said selectively sensed at least one analog signal being produced on said print medium extending in the direction of advance of said print medium, said processor means inputting said data to said printer during the time that data is written into said memory means but at a rate slower than the rate said data is written into said memory means.
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Abstract
An electrocardiograph included microprocessor control of signals not only from conventional electrocardiograph electrodes but also from a phonocardiographic pickup. The signals are multiplexed, converted to digital representations for processing and are displayed on a printer. Keyboard control of the microprocessor and both analog signal and modem outputs are provided.
42 Citations
20 Claims
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1. An electrocardiograph for connection to sensors outputting analog electrical signals, comprising:
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at least one sensor outputting analog electrical signals; sampling means for selectively sensing at intervals at least one of such analog signals from at least one of said sensors; analog to digital conversion means for receiving said sampled analog signals and outputting digitized signals corresponding thereto; memory means including a plurality of addresses for storage of data therein; processor means for writing said consecutively sampled digitized signals representative of a predetermined duration of the at least one analog sensor output signal into said addresses of said memory means for storage therein in consecutive order; printer means for recording on a print medium in response to digital data input thereto, said processor means being further adapted to automatically read said stored date from said addresses in said memory means in said consecutive order and input said data to said printer means for printing a series of portions of a curve representative of the analog signal from said at least one sensor, said printer means being adapted to advance said print medium after printing each said curve portion, a cardiogram of said predetermined duration of said selectively sensed at least one analog signal being produced on said print medium extending in the direction of advance of said print medium, said processor means inputting said data to said printer during the time that data is written into said memory means but at a rate slower than the rate said data is written into said memory means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification