Method for rejecting electrical interference from physiological measurements
CA 2129553 C · Owner: Mckown, Russell C. · Inventors: Mckown, Russell C.; Eckert, Chris; Quinn, Michael D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods and apparatus for eliminating the effects of electrosurgical interference on continuous, heat-based cardiac output measurements employing several procedures including the steps of (1) , supplying power via an isolation transformer (12) and carrier frequency to a catheter-mounted heating element (16); (2) measuring the voltage and current on the primary side (10) of the isolation transformer (12); (3) determining the voltage and current on the secondary side (14) of the transformer (12) on the basis of the measured primary side voltage and current; and (4) calculating the power delivered to and resistance of the cathetermounted heater (16) on the basis of the secondary voltage …
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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
- Filed January 28, 1993 and granted May 8, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 2015.
- 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.