Mechanical respirator
AssigneeSan Diego State University (SDSU) Foundation
InventorsKevin N. Wood, Tyler Lestak, Jack Lucas, Ener Arvizu-Munoz
Life of this patent
Estimating the term…
Abstract
In alternative embodiments, provided are mechanical ventilators and methods for making and using them.
Claims14
A mechanical ventilator, comprising:
- a fluid flow controller disposed to receive a mixed gas along at least a first line, the mixed gas including oxygen from an oxygen source and compressed air from a compressed air source/generator operably connected to the fluid flow controller, the fluid flow controller having a fluid flow controller output line operably connected to a patient line, the fluid flow controller being driven by an on-off valve to deliver the mixed gas to the patient line at appropriate intervals where a tidal volume (TV), inspiratory time, and/or peak inspiratory pressure (PIP) arise from fluid forced to a patient as dictated by the fluid flow controller;
- a controller for the on-off valve;
- a second line disposed to receive the mixed gas, the second line being configured to create a continuous, constantly flowing positive end-expiratory pressure (PEEP) for delivering the mixed gas along a PEEP output line to the patient line;
- a junction combining the fluid flow controller output line and the PEEP output line, the patient line being operatively connected to and downstream of the junction;
- and
- a uni-directional valve disposed within or upstream of the patient line and downstream of the fluid flow controller output line.
A method for operating a mechanical ventilator, the mechanical ventilator including a fluid flow controller disposed to receive a mixed gas along at least a first line, the mixed gas including oxygen from an oxygen source and compressed air from a compressed air source operably connected to the fluid flow controller, the fluid flow controller having a fluid flow controller output line operably connected to a patient line, the fluid flow controller being controlled by a pneumatic actuator powered by an on/off valve to deliver the mixed gas to the patient line at a tidal volume (TV), inspiratory time, and/or peak inspiratory pressure (PIP) provided by the fluid flow controller, a controller for controlling the on/off valve, a second line disposed to receive the mixed gas, the second line being configured to create a continuous positive end-expiratory pressure (PEEP) for delivering the mixed gas along a PEEP output line to the patient line, a junction combining the fluid flow controller output line and the PEEP output line, the patient line being operatively connected to and downstream of the junction, and a three-way valve disposed within or upstream of the patient line and downstream of the fluid flow controller output line, the method comprising:
- receiving an inspiratory time, a patient pressure, and a respiratory rate;
- providing a model that relates the inspiratory time, the patient pressure, a system pressure, and a patient flow pressure to a tidal volume;
- determining one or more ventilator parameters to achieve delivery of desired breaths to a patient along the patient line using the model;
- and
- controlling operation of the mechanical ventilator based on the determined ventilator parameters.
Dependencies are inferred from the claim text.