Electricity: measuring and testing – Electrical speed measuring – Including 'event' sensing means
Patent
1974-12-12
1977-01-11
Demeo, Palmer C.
Electricity: measuring and testing
Electrical speed measuring
Including 'event' sensing means
324 78D, G04F 800
Patent
active
040029794
ABSTRACT:
Electrical pulse width measuring apparatus wherein the presence of a pulse of unknown time duration is utilized to initiate generation of a reference pulse of known time duration. The reference pulse is generated by means including a monostable multivibrator together with a controlled driving circuit connected to the multivibrator timing capacitor. The time duration of the reference pulse accordingly is made linearly proportional to an input control variable such as a manually adjustable dial setting. The unknown and reference pulses are applied as inputs to a flip-flop circuit, the final state of which is determined by the pulse of longer time duration. An indicator coupled to the flip-flop circuit provides a visual indicator of the final state thereof. The apparatus can be used to measure or monitor a signal occuring in the body of a patient, such as the artifact pulse from an implanted cardiac pacemaker. The apparatus includes means to condition the artifact pulse and to generate a standardized pulse which accurately represents the width of the pacemaker pulse, and the apparatus further includes means for indicating when the width of the pacemaker pulse changes by a predetermined amount.
REFERENCES:
patent: 3337796 (1967-08-01), Hentschel
patent: 3535620 (1970-10-01), Johnston
patent: 3559066 (1971-01-01), Pincus
patent: 3711772 (1973-01-01), Brown
patent: 3735347 (1973-05-01), Whitney
patent: 3766818 (1973-10-01), Prohofsky
DiTusa Anthony J.
Giori Francis A.
DeMeo Palmer C.
Electro Sciences for Medicine, Inc.
Tokar Michael J.
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