Back to results
US 9,433,743 B2Granted
Ventilator exhalation flow valve
AssigneeCareFusion 303, Inc.
InventorsMalcolm R. Williams, Adrian D. Desilva, Huy Thanh Vu
Life of this patent
Estimating the term…
Abstract
Described herein is an exhalation valve for a ventilator that controls gas flow through a patient exhalation line in response to a target pressure within the line. The valve controls gas flow by (i) providing both a high frequency signal and a low frequency signal through a coil positioned in a fixed magnetic field, (ii) determining a position of the coil by detecting the high frequency signal, and (iii) controlling a position of the coil by adjusting the low frequency signal.
Claims11
A valve comprising:
- a valve orifice with an adjustable opening;
- a fixed magnetic field;
- a force coil configured to be moved within the fixed magnetic field in response to a low frequency current;
- a current amplifier configured to direct a summed current comprising the low frequency current and a high frequency current into the force coil;
- a feedback coil configured to detect the high frequency current in the force coil, the detected high frequency current having a magnitude that is proportional to a force coil position within the fixed magnetic field;
- a processor configured (i) to receive data relating to the position of the force coil and (ii) to send instructions to the current amplifier;
- and
- a diaphragm configured to adjust the valve orifice opening based on the position of the force coil.
5 more elements
Dependencies are inferred from the claim text.