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:
Oct. 31, 2000
Filed:
Dec. 21, 1998
Robert Lewis Blythe, Longmont, CO (US);
Sherwood Services AG, Shaffhausen, CH;
Abstract
A method and apparatus detect occlusion in a tube to a passage into a body cavity. An argon gas supply output received by plural selectable flow orifices so one or more of the orifices delivers predetermined metered gas. A duct with a volume of gas selectively provides metered gas to the passage. The tube connects the passage and the duct periodically so a duct pressure transducer can signal. A circuit tests signals of tube equalization with a back pressure. A three way valve controlled by the circuit connects the duct transducer to gas metered to the cavity. Plural orifices provide specific gas flows to the handset and the valve for equalizing them with metered gas as a function of the flow. Connecting plural orifices to meter gas output, delivering the metered gas output with one or more of the orifices, containing the volume of gas in the duct connected to the metered gas output, selectively connecting the duct to the passage, connecting the tube to the passage with the duct and the transducer to periodically signal are steps.