System and method for providing a breathing gas

• US 8,066,004 B2
• Filed: 11/23/2009
• Issued: 11/29/2011
• Est. Priority Date: 06/23/2003
• Status: Active Grant

• Current Assignee: Ventec Life Systems, Inc.
• Original Assignee: Invacare Corporation
• Inventors: Flolid, Gregory William, Morris, Make, Curran, Neal Joseph
• Primary Examiner(s): DOUGLAS, STEVEN O
• Application Number:
  US12/623,994
• Publication Number:
  US 20100065055A1
• Time in Patent Office: 736 Days
• Field of Search: 128/204.18, 128/204.21, 128/204.23, 128/205.23, 128/205.24, 128/205.18, 128/200.24, 128/204.22
• US Class Current: 128/204.23
• CPC Class Codes: A61M 16/00 Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes stimulating the respiratory movement by mechanical, pneumatic or electrical means, iron lungs combined with gas breathing means A61H31/00
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/107 in the inspiratory path
• CPC Class Codes: A61M 16/204 used for inhalation control
• CPC Class Codes: A61M 16/205 used for exhalation control
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2230/005 Parameter used as control input for the apparatus
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)

Abstract

Systems and methods for providing a breathing gas are provided. In one embodiment, the method includes sensing a sensed parameter associated with delivery of the breathing gas, changing a control parameter associated with a flow/pressure control element in response to a difference between the sensed parameter and a first predetermined sensed parameter value during a first portion of a breathing cycle, determining a transition from the first portion to a second portion of the breathing cycle based at least in part on the changing control parameter, changing the control parameter to cause a first change in the sensed parameter during the second portion of the breathing cycle based at least in part on the determined transition, and changing the control parameter to cause a second change in the sensed parameter during a third portion of the breathing cycle based at least in part on the first predetermined sensed parameter value.

Claims

1. A system for providing a breathing gas comprising:

a flow path adapted to receive a patient interface;

a blower in fluidic communication with the flow path;

a variable position valve in fluidic communication with the flow path;

a pressure sensor disposed to detect a pressure associated with delivery of breathing gas to the patient interface; and

a controller in operative communication with the pressure sensor, blower, and variable position valve, wherein the controller controls the variable position valve to provide the breathing gas;

i) at a first breathing gas pressure during a first portion of a patient breathing cycle, ii) at a second breathing gas pressure during a second portion of the patient breathing cycle, and iii) at the first breathing gas pressure during a third portion of the patient breathing cycle.

2. The system of claim 1 wherein the variable position valve selectively diverts breathing gas from the flow path.

3. The system of claim 2 wherein the variable position valve directs the diverted breathing gas to a non-ambient input associated with the blower.

4. The system of claim 1 wherein the first portion of the patient breathing cycle is associated with an inhalation state.

5. The system of claim 1 wherein the second portion of the patient breathing cycle is associated with an unload portion of an exhalation state.

6. The system of claim 1 wherein the third portion of the patient breathing cycle is associated with a load portion of an exhalation state.

7. The system of claim 1 wherein the controller changes a control parameter associated with the variable position valve to provide the breathing gas.

8. The system of claim 7 wherein the control parameter includes a valve step position.

9. A system for providing a breathing gas comprising:

a flow path adapted to receive a patient interface;

at least one flow/pressure control element in fluidic communication with the flow path;

at least one sensor element disposed to detect a sensed parameter associated with delivery of the breathing gas; and

a controller in operative communication with the at least one flow/pressure control element and the at least one sensor element, wherein the controller controls the at least one flow/pressure control element to provide the breathing gas;

i) at a first breathing gas pressure during a first portion of a patient breathing cycle, ii) at a second breathing gas pressure during a second portion of the patient breathing cycle, and iii) at the first breathing gas pressure during a third portion of the patient breathing cycle.

10. The system of claim 9 wherein the flow/pressure control element comprises any one or any two or more of the following:

a variable position valve, a variable speed blower, a linear valve, a solenoid valve, and a stepper motor controlled variable position valve.

11. The system of claim 9 wherein the sensor element comprises any one or any two or more of the following:

a pressure sensor, a flow sensor, a temperature sensor, an infra-red light emitter/sensor, a motor current sensor, and a motor speed sensor.

12. The system of claim 9 wherein the sensed parameter comprises any one or any two or more of the following:

breathing gas pressure, breathing gas flow, breathing gas temperature, breathing gas composition, motor current, and motor speed.

13. The system of claim 9 wherein the at least one flow/pressure control element selectively diverts breathing gas from the flow path.

14. The system of claim 9 wherein the first portion of the patient breathing cycle is associated with an inhalation state.

15. The system of claim 9 wherein the second portion of the patient breathing cycle is associated with an unload portion of an exhalation state.

16. The system of claim 9 wherein the third portion of the patient breathing cycle is associated with a load portion of an exhalation state.

17. The system of claim 9 wherein the controller changes a control parameter associated with the at least one flow/pressure control element to provide the breathing gas.

18. The system of claim 17 wherein the control parameter includes a valve step position.

19. The system of claim 17 wherein the control parameter includes a blower speed.