Gas flow control method in a blower based ventilation system
US7487773B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 2004 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Sep 21, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/3365
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention is directed to a system and method for controlling the flow of gas from a medical ventilator into a patient's lungs. The control system provides for a non-linear feedforward controller to correct for disturbances caused by back pressure at the outlet of the blower of the medical ventilator. For this purpose, a pressure transducer is provided to measure the back pressure. Additionally, the invention allows for a feedback controller to correct for the differences between the rate of the actual gas flow and the targeted gas flow rate. For this purpose a flow rate transducer is provided. The control system may account for each of the gas flow rate error and the back pressure disturbance to provide for a quick and accurate adjustment to achieve the targeted gas flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.