Patent ID: 7328703
Filing Date: 2008-02-12
Classification: A61M

Abstract:
1. A pulmonary oxygen flow control system comprising: a structure, said structure having an oxygen inlet connection and an outlet connection, an inlet passage in such structure connected to said inlet connection, said inlet passage terminating in a venturi orifice, an outlet passage in said structure, said outlet passage being positioned in the flow path of said venturi orifice to receive oxygen flowing through said venturi orifice, a reservoir passage adjoining said outlet passage and lying adjacent said venturi orifice, a reservoir connected to said reservoir passage; a nasal cannula connected to said outlet passage; said venturi orifice, said outlet passage and said reservoir passage being configured so that when a patient is inhaling from said nasal cannula, oxygen flows through said venturi orifice and draws oxygen from said reservoir because of low pressure in said outlet passage due to venturi caused decrease in pressure with oxygen flow delivered to said cannula, and when the patient is not inhaling, oxygen is directed from said orifice into said reservoir passage and into said reservoir due to increased pressure in said outlet passage so that said passages act as a gas dynamic valve directing oxygen flow to deliver at the very beginning of inhalation and to permit pursed lip breathing.