Nasopharyngeal airway with reflectance pulse oximeter sensor
CA 2343207 A1 · Owner: Shepherd, John M. · Inventors: Shepherd, John M.; Walker, Steven C.; Alexander, John G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A combined nasopharyngeal airway and pulse oximeter sensor capable of monitoring the posterior pharynx, posterior soft palate or nasal mucosa is disclosed. The nasopharyngeal airway (10) includes a thickened wall section (12) over approximately one-third of its circumference. Pulse oximeter sensor elements (20, 22, 24, 26) may be embedded in the airway. The pulse oximeter sensor elements may include a light source (20) which preferably emits light , at wavelengths around 660 nm (red) and around 940 nm (near infrared) and a , light detector (22). The pulse oximeter sensor elements may be connected to a pulse oximeter monitor (spectrophotometer) or other external device for analysis.
Read the whole patent
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 September 3, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2021.
- 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.