Lung ventilator device
AssigneeUniversity of Manitoba
InventorMagdy Younes
Life of this patent
Estimating the term…
Abstract
Ventilation to a patient is provided in response to patient effort. The free flow of gas from a piston, or similar air source, in response to patient inhalation is detected, the instantaneous rate and volume of flow are measured and the measurements are used as control signals to a drive motor for the piston to move the piston to generate a pressure which is proportional to the sum of measured and suitably amplified rate and volume of flow signals. Since the command signal to the pressure generator only changes subsequent to, and not in advance of, a change in flow and volume, the ventilator is subservient to the patient and provides a proportional assist to patient ongoing breathing effort during inspiration (Proportional Assist Ventilation, PAV).
Claims16
A method for providing breathing assistance in proportion to patient ongoing inspiratory effort, which comprises:
- providing a free flow of gas from a gas delivery system to a patient in response to a pressure gradient generated by patient inspiratory effort,
- determining the rate and volume of flow of said gas to said patient,
- independently amplifying signals corresponding to said determined rate and volume of flow, and
- providing a pressure assist to said gas in proportion to the sum of said determined and amplified rate and volume of flow.
Apparatus for delivering proportional assist ventilation to a patient, comprising:
- means for delivering a free flow of gas to said patient in response to patient inhalatory effort,
- means operatively connected to said gas delivery means for generating pressure in said free flow of gas in response to an electrical command signal,
- detection means for detecting the instantaneous volume and rate of gas flow to said patient and for generating a separate electrical signal corresponding in magnitude to each of said detected values,
- means for selectively applying amplification to each of said electrical signals, and
- means for generating said electrical command signal to said pressure generating means in proportion to the sum of said amplified electrical signals corresponding in magnitude to said instantaneous rate and volume of flow.
Dependencies are inferred from the claim text.