METHOD FOR CONTROLLING DELIVERY OF BREATHING GAS TO A PATIENT USING MULTIPLE VENTILATION PARAMETERS

• US 20090241956A1
• Filed: 03/20/2009
• Published: 10/01/2009
• Est. Priority Date: 03/27/2008
• Status: Abandoned Application

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Nellcor Puritan Bennett LLC (Medtronic Plc)
• Inventors: Karst, Edward F., Vandine, Joseph Douglas, Baker, Clark R. Jr.
• Application Number:
  US12/408,546
• Publication Number:
  US 20090241956A1
• Time in Patent Office: Days
• US Class Current: 128/204.230
• CPC Class Codes: A61M 11/00 Sprayers or atomisers specially adapted for therapeutic purposes in general B05B; aerosol containers B65D83/14
• CPC Class Codes: A61M 16/04 Tracheal tubes catheters in general A61M25/00
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 16/101 using an oxygen concentrator
• CPC Class Codes: A61M 16/12 by mixing different gases
• CPC Class Codes: A61M 16/125 Diluting primary gas with ambient air
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/003 with a flowmeter
• CPC Class Codes: A61M 2202/0208 Oxygen
• CPC Class Codes: A61M 2202/0225 Carbon oxides, e.g. Carbon dioxide
• CPC Class Codes: A61M 2202/0266 Nitrogen (N)
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 2205/52 with memories providing a history of measured variating parameters of apparatus or patient
• CPC Class Codes: A61M 2205/582 by tactile feedback
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2230/005 Parameter used as control input for the apparatus
• CPC Class Codes: A61M 2230/06 Heartbeat rate only
• CPC Class Codes: A61M 2230/205 partial oxygen pressure (P-O2)
• CPC Class Codes: A61M 2230/30 : Blood pressure A61M2230/04 takes precedence
• CPC Class Codes: A61M 2230/42 : Rate
• CPC Class Codes: A61M 2230/432 : partial CO2 pressure (P-CO2)
• CPC Class Codes: A61M 2230/50 : Temperature

Abstract

The disclosure provides a method for controlling the delivery of a breathing gas to a patient. The method may include regulating the fractional inspired oxygen (FiO₂) of the breathing gas delivered to the patient, determining a blood oxygenation level of the patient, determining a ventilation parameter, and automatically adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter.

Claims

1. A method for controlling the delivery of a breathing gas to a patient, the method including:

regulating the fractional inspired oxygen (FiO₂) of the breathing gas delivered to the patient;

determining a blood oxygenation level of the patient;

determining a ventilation parameter; and

automatically adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter.

2. The method of claim 1, wherein the blood oxygenation level is determined by measuring the saturation of peripheral oxygen (SpO₂) in the patient.

3. The method of claim 1, wherein adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter comprises:

adjusting the FiO₂ of the breathing gas delivered to the patient to maintain a target value for the blood oxygenation level of the patient; and

modifying the target value for the blood oxygenation level of the patient based on the determined ventilation parameter.

4. The method of claim 1, wherein the determined ventilation parameter includes a physiologic characteristic of the patient.

5. The method of claim 1, wherein the determined ventilation parameter includes one or more patient respiratory parameters.

6. The method of claim 1, wherein the determined ventilation parameter includes one or more patient cardiovascular parameters.

7. The method of claim 1, wherein the determined ventilation parameter includes a measurement related to the operation of a gas delivery system.

8. The method of claim 1, wherein the determined ventilation parameter includes a measurement related to a signal quality associated with either the blood oxygenation level or the determined ventilation parameter.

9. The method of claim 1, wherein the determined ventilation parameter includes a user input.

10. The method of claim 1, wherein the determined ventilation parameter includes a history of adjustments to the FiO₂ of the breathing gas delivered to the patient.

11. The method of claim 1, wherein adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter includes reducing the magnitude of the adjustment of the FiO₂ of the breathing gas delivered to the patient if the determined ventilation parameter indicates significant variance from a pre-determined baseline value.

12. The method of claim 1, wherein adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter includes inhibiting the adjustment of the FiO₂ of the breathing gas delivered to the patient if the determined ventilation parameter indicates significant variance from a pre-determined baseline value.

13. The method of claim 1, wherein adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter includes changing the frequency of the adjustment of the FiO₂ of the breathing gas delivered to the patient if the determined ventilation parameter indicates significant variance from a pre-determined baseline value.

14. The method of claim 1, wherein adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter includes changing the response rate of the adjustment of the FiO₂ of the breathing gas delivered to the patient if the determined ventilation parameter indicates significant variance from a pre-determined baseline value.

15. The method of claim 1, wherein adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter includes:

adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level if the determined blood oxygenation level moves in a first direction; and

adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter if the determined blood oxygenation level moves in a second direction.

16. The method of claim 1, further comprising:

determining a second ventilation parameter; and

adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined second ventilation parameter.

17. The method of claim 1, further comprising:

regulating a second ventilation parameter characteristic of the breathing gas delivered to the patient; and

automatically adjusting the second ventilation parameter of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter.

18. A system for delivering breathing gas to a patient, the system comprising:

a regulator configured to control the fractional inspired oxygen (FiO₂) of the breathing gas delivered to the patient;

a sensor configured to determine a blood oxygenation level of the patient;

a parameter module configured to determine a ventilation parameter; and

a controller configured to automatically adjust the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter.

19. The system of claim 18, wherein the sensor determines the saturation of peripheral oxygen (SpO₂) of the patient.

20. The system of claim 18, further comprising the controller configured:

to automatically adjust the FiO₂ of the breathing gas delivered to the patient to maintain a target value for the blood oxygenation level of the patient; and

to automatically modify the target value for the blood oxygenation level of the patient based on the determined ventilation parameter.

21. The system of claim 18, further comprising:

the parameter module configured to determine a second ventilation parameter; and

the controller configured to automatically adjust the FiO₂ of the breathing gas delivered to the patient based the second determined ventilation parameter.

22. The system of claim 18, further comprising:

the regulator configured to control a second characteristic of the breathing gas delivered to the patient; and

the controller configured to automatically adjust the second characteristic of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter.

23. The system of claim 18, wherein the sensor and the regulator are integrated.

24. A computer-readable storage medium storing a set of instructions executable on a processor, the set of instructions for controlling the delivery of a breathing gas to a patient, the set of instructions comprising:

instructions for regulating the fractional inspired oxygen (FiO₂) of the breathing gas delivered to the patient;

instructions for determining a blood oxygenation level of the patient;

instructions for determining a ventilation parameter; and

instructions for automatically adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter.

25. A breathing assistance system, comprising:

means for regulating the fractional inspired oxygen (FiO₂) of the breathing gas delivered to the patient;

means for determining a blood oxygenation level of the patient;

means for determining a ventilation parameter; and

means for automatically adjusting the FiO₂ of the breathing gas delivered to the patient based on the determined blood oxygenation level and the determined ventilation parameter.