The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1978
Filed:
Nov. 03, 1976
Robert Lee Cannon, III, Waltham, MA (US);
Other;
Abstract
An improved atrial synchronous heart pacer includes means for generating an atrio-ventricular (A-V) interval control signal of automatically variable duration, which duration is a function of the sensed atrial heart rate (i.e. P-wave rate). A timing circuit establishes a basic timing interval for the generation of ventricular stimulation pulses, which interval may be modified by the control of the A-V interval signal. The A-V interval control signal preferably comprises the output of a P-wave triggered monostable multivibrator. The time constants of the multivibrator's timing circuits are scaled such that operation within the heart-rate range of 55-150 beats per minute prevents full recovery of the multivibrator following each sensed atrial beat and generation of an A-V output pulse, resulting in an A-V output pulse whose duration is a function of the time since the preceding trigger (i.e. rate). By appropriately coupling the variable duration A-V interval pulse to the ventricular stimulation pulse timing circuitry, it is possible to adjust the threshold voltage of a relaxation oscillator such that the ventricular stimulation pulse is generated at the end of an A-V delay following a sensed P-wave, the interval of the A-V delay being variable and dependent on the P-wave rate.