Variable p-r interval pacemaker
CA 1083674 A · Owner: Medtronic, Inc. · Inventors: Adams, John M.; Lin, Heh-Sen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pacemaker has circuitry which allows the time between the detection of an atrial contraction and the provision of an electrical stimulus to cause a ventricular contraction to vary with the rate of the sensed atrial contractions. The circuitry includes a differential amplifier having a reference voltage applied to one input and a capacitor coupled to the second input. The capacitor is charged from the time the atrial contraction is sensed to the time the charge equals the reference voltage, at which time the electrical stimulus is provided and the capacitor is discharged between the time the electrical stimulus is provided and the next atrial contraction is sensed. As the heart rate …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted August 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 12, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.