Multiple-pulse method and apparatus for use in oximetry
CA 1301927 C · Owner: Smith, Robert E. · Inventors: Smith, Robert E.; Prosser, Stephen J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The disclosed invention is for use in extracting more accurate information from signals employed in pulse oximetry. Basically pulse oximetry, involves the illumination of arterial blood flowing in tissue with light at two wavelengths. Upon emerging from the tissue the light is received by a detector (38) that produces signals that are proportional to the intensity of the light received at each of the wavelengths. Each signal includes a slowly varyingbaseline component representing the attenuation .beta. (t) of light produced by bone tissue, skin, and hair. The signals also include pulsatile components representing the attenuation .alpha. (t) produced by the changing blood volume …
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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 May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- 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.