ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,491,331, issued on Dec. 9.
"Dual-pressure respiratory assistance device" was invented by Stephen John (Portage, Mich.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A respiratory delivery system providing a bi-level pressure airflow. The system includes respiratory and pneumatic circuits. The respiratory circuit includes a respiratory gas supply, a patient interface, and a bi-level pressure regulator. The respiratory gas supply supplies a respiratory gas to the patient interface via a first conduit. The bi-level pressure regulator is coupled to the patient interface via a second conduit and is configured to cyclically alternate the respiratory gas passin...