US3853119A — Method and system for display of electrocardiogra…

Claim 1

Independent Claim 123 words

A method of displaying analog ECG signals with the aid of an oscilloscope which has a time base input and an amplitude input, said method comprising the steps of a. digitizing said signals to provide a first digital output upon each corresponding recurring portion thereof and a plurality of second digitally coded signals each corresponding to a successive amplitude increment thereof, b. storing said second signals each for predetermined periods of time, c. reconverting said second signals into their analog ECG signal form, d. applying said reconverted second signal to the amplitude input of said oscilloscope, e. generating a time base signal synchronous with said first digital output, and f. applying said time base signal to the time base input of said oscilloscope.

Claim 2

Independent Claim 123 words

A method of displaying analog ECG signals with the aid of an oscilloscope which has a time base input and an amplitude input, said method comprising the steps of a. digitizing said signals to provide a first digital output upon each corresponding recurring portion thereof and a plurality of second digitally coded signals each corresponding to a successive amplitude increment thereof, b. storing said second signals each for predetermined periods of time, c. reconverting said second signals into their analog ECG signal form, d. applying said reconverted second signal to the amplitude input of said oscilloscope, e. generating a time base signal synchronous with said first digital output, and f. applying said time base signal to the time base input of said oscilloscope.

Claim 3

Dependent Claim 74 words

The invention as set forth in claim 1 wherein said digitizing step includes the steps of a. detecting the occurrence of said corresponding recurring portions, b. producing a pulse upon each detection to provide said first digital outputs, c. sampling said ECG signals at a rate very much greater than the expected rate for normal ECG signals of said first outputs, d. producing very many more of said second signals than said first signals.

Claim 4

Dependent Claim 28 words

The invention as set forth in claim 1 wherein said predetermined periods of time are less than the expected period for normal ECG signals of said first outputs.

Claim 5

Dependent Claim 44 words

The invention as set forth in claim 2 wherein said predetermined periods of time for storing second signals during said storing step are each for a period of time of less duration than the expected period between said first signals for normal ECG signals.

Claim 6

Dependent Claim 47 words

The invention as set forth in claim 4 wherein said generating step includes the steps of a. generating a time base signal which increases in amplitude from a certain amplitude, b. resetting said signal to said certain amplitude in accordance with the occurrence of said first output.

Claim 7

Independent Claim 152 words

A system for displaying ECG signals on an oscilloscope having amplitude and time base inputs, said system comprising a. means for digitizing ECG signals to provide first digital outputs upon occurrence of a recurring portion of each said ECG signals and second digital outputs each consisting of a multi-bit digital signal upon successive incremental portions of said ECG signals which corresponds to the amplitude thereof, b. memory means for storing said second digital signals for predetermined periods of time, c. digital to analog converter means responsive to said second signals after storage thereof in said memory means for providing signals corresponding to said first signals, d. means for aPplying said signals from said converting means to said amplitude inputs of said oscilloscope, e. means for generating time base signals synchronous with said first digital signals, and f. means for applying said time base signals to said time base input of said oscilloscope.

Claim 8

Independent Claim 152 words

A system for displaying ECG signals on an oscilloscope having amplitude and time base inputs, said system comprising a. means for digitizing ECG signals to provide first digital outputs upon occurrence of a recurring portion of each said ECG signals and second digital outputs each consisting of a multi-bit digital signal upon successive incremental portions of said ECG signals which corresponds to the amplitude thereof, b. memory means for storing said second digital signals for predetermined periods of time, c. digital to analog converter means responsive to said second signals after storage thereof in said memory means for providing signals corresponding to said first signals, d. means for aPplying said signals from said converting means to said amplitude inputs of said oscilloscope, e. means for generating time base signals synchronous with said first digital signals, and f. means for applying said time base signals to said time base input of said oscilloscope.

Claim 9

Dependent Claim 41 words

The invention as set forth in claim 6 wherein said memory means has a plurality of storage locations for each of said second digital signals, and means for retaining said digital signals in said memory for a predetermined period of time.

Claim 10

Dependent Claim 95 words

The invention as set forth in claim 7 wherein said memory means comprises a random access memory, address counter means for controlling the locations into which said second digital signals are loaded and from which said second digital signals are read out, said retaining means including means for applying timing signals to said counter at a rate much greater than the rate of repetition of said corresponding recurring portions of said ECG signals in normal ECG signals for selecting said loading and readout locations and the time when each thereof is addressed by said counter.

Claim 11

Dependent Claim 76 words

The invention as set forth in claim 7 wherein said memory is a shift register, into the first stage of which said second digital signals are read in and from the last stage of which said signals are read out into said digital to analog conversion means, and said retaining means including means for applying shift pulses to said register at a rate very much greater then the rate of occurrence of said first digital signals.

Claim 12

Dependent Claim 81 words

The invention as set forth in claim 8 wherein said memory means further comprises a plurality of latches each for a different bit of said second digital signal, and said retaining means includes means for applying second timing signals for loading said second digital signals when read out of said random access memory into said latches, said second timing signals being at the same rate as said first named timing signals and displaced in time ahead of said first timing signals.

Claim 13

Dependent Claim 72 words

The invention as set forth in claim 10 wherein said digitizing means includes a R-wave detector for providing as said first digital signal, said generating means includes means coupled to said R-wave detector for providing a pulse synchronous with said first digital signal, a saw-tooth wave generator, and means for reinitiating said wave synchronously with said pulse, said wave from said saw-tooth wave generator providing said time base input to said oscilloscope.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-12-09	1978-06-10	1978-12-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-12-09	1982-06-10	1982-12-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-12-09	1986-06-10	1986-12-10	$7700.00	Window Closed / Lapsed

Method and system for display of electrocardiographic (ecg) signals

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