Systems and Methods for Providing Active Noise Control in a Breathing Assistance System

• US 20080110459A1
• Filed: 09/29/2006
• Published: 05/15/2008
• Est. Priority Date: 09/29/2006
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Nellcor Puritan Bennett Incorporated (Medtronic Plc)
• Inventors: Farbarik, John M.
• Granted Patent: US 7,891,354 B2
• Time in Patent Office: Days
• US Class Current: 128/204.18
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0057 Pumps therefor
• CPC Class Codes: A61M 16/0063 Compressors
• CPC Class Codes: A61M 16/0066 Blowers or centrifugal pumps
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/026 specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
• CPC Class Codes: A61M 2205/3375 Acoustical, e.g. ultrasonic, measuring means
• CPC Class Codes: A61M 2205/42 Reducing noise

Abstract

A breathing assistance system having active noise control may include a gas delivery system, a patient interface, a connection system, and a noise control system. The gas delivery system may supply breathing gas to a patient via the connection system and the patient interface. The noise control system may include a processor, a speaker, a reference signal source, and a feedback sensor. The processor may generate noise control signals to be output by the speaker for canceling noise caused by a noise source of the breathing assistance system. The reference signal source may communicate reference signals associated with the noise source. The feedback sensor may detect noise caused by the noise source and noise control signals output by the speaker, and communicate to the processor feedback noise signals based on the detected noise. The processor may generate the noise control signals based at least on the reference signals and the feedback noise signals.

Claims

1. A breathing assistance system having active noise control, the system comprising:

a gas delivery system operable to supply breathing gas;

a patient interface configured to interface with a patient for delivering breathing gas to one or more breathing passages of the patient;

a connection system configured to communicate breathing gas supplied by the gas delivery system to the patient interface for delivery to the patient; and

a noise control system configured to control noise caused by a noise source associated with the breathing assistance system, the noise control system including;

a processor configured to generate noise control signals for at least partially canceling noise caused by the noise source;

a reference signal source configured to communicate to the processor reference signals associated with the noise source;

a speaker operable to output the noise control signals generated by the processor for at least partially canceling noise caused by the noise source; and

a feedback sensor configured to detect noise caused by the noise source and noise control signals output by the speaker, and communicate to the processor feedback noise signals based on the detected noise;

wherein the processor is configured to generate the noise control signals based at least on the reference signals and the feedback noise signals.

2. A breathing assistance system according to claim 1, wherein at least one of the speaker and the feedback sensor is located away from the gas delivery system and proximate the patient.

3. A breathing assistance system according to claim 1, wherein at least one of the speaker and the feedback sensor is located at the patient interface or the connection system.

4. A breathing assistance system according to claim 1, wherein:

the reference signal source is located a first distance from the noise source; and

the speaker and the feedback sensor are located further than the first distance from noise source.

5. A breathing assistance system according to claim 1, wherein the reference signal source, the speaker, and the feedback sensor are located along the length of a conduit.

6. A breathing assistance system according to claim 1, wherein the noise source comprises the gas delivery system.

7. A breathing assistance system according to claim 1, wherein the reference signal source comprises a sensor configured to detect noise caused by the noise source.

8. A breathing assistance system according to claim 1, wherein the reference signal source comprises at least one of a microphone and an accelerometer.

9. A breathing assistance system according to claim 1, wherein the reference signal source comprises a sensor configured to detect noise caused by the noise source.

10. A breathing assistance system according to claim 1, wherein:

the noise source has an associated speed; and

the reference signals identify the speed of the noise source.

11. A breathing assistance system according to claim 10, wherein the reference signal source comprises a controller configured to control the speed of the noise source.

12. A breathing assistance system according to claim 10, wherein the reference signal source comprises a tachometer.

13. A breathing assistance system according to claim 1, wherein the noise control system further includes a translator configured to receive reference signals from the reference signal source, translate the reference signals, and communicate the translated reference signals toward the processor.

14. A breathing assistance system according to claim 1, wherein the gas delivery system comprises a motorized blower.

15. A breathing assistance system according to claim 1, wherein the noise control system is configured to control noise caused by gas flowing through one or more passageways associated with the breathing assistance system.

16. A breathing assistance system according to claim 1, wherein the speaker is operable to output audible feedback regarding the operation of the breathing assistance system in addition to outputting the noise control signals.

17. A breathing assistance system according to claim 1, wherein the noise control signals provide both noise cancellation and noise leveling functions, wherein noise leveling comprises leveling the perceived noise over a plurality of breath cycles.

18. A noise control system for controlling noise associated with a breathing assistance system, the noise control system comprising:

a processor configured to generate noise control signals for at least partially canceling noise associated with a noise source of a breathing assistance system;

a reference signal source configured to communicate to the processor reference signals associated with the noise source;

a speaker operable to output the noise control signals generated by the processor for at least partially canceling noise caused by the noise source; and

a feedback sensor configured to;

detect noise caused by the noise source and noise control signals output by the speaker; and

communicate to the processor feedback noise signals based on the detected noise;

wherein the processor is configured to generate the noise control signals based at least on the reference signals and the feedback noise signals.

19. A noise control system according to claim 18, wherein:

the breathing assistance system includes a ventilation system; and

at least one of the speaker and the feedback sensor is located away from the ventilation system and proximate the patient.

20. A noise control system according to claim 18, wherein the reference signal source comprises a sensor configured to detect noise caused by the noise source.

21. A noise control system according to claim 18, wherein the reference signal source comprises at least one of a microphone and an accelerometer.

22. A noise control system according to claim 18, wherein the reference signal source comprises a sensor configured to detect noise caused by the noise source.

23. A noise control system according to claim 18, wherein:

the breathing assistance system includes a device having an associated speed; and

the reference signals identify the speed of the device.

24. A noise control system according to claim 23, wherein the device comprises a motorized blower.

25. A noise control system according to claim 18, further comprising a translator configured to receive reference signals from the reference signal source, translate the reference signals, and communicate the translated reference signals toward the processor.

26. A system for providing active noise control in a breathing assistance system, the system comprising:

a gas delivery device operable to supply pressurized gas for a breathing assistance system;

a sensor operable to detect noise associated with the breathing assistance system, including noise caused by the gas delivery device;

a processor operable to generate noise cancellation signals based at least on the detected noise, the noise cancellation signals operable to at least partially cancel the noise associated with the breathing assistance system; and

a speaker operable to output the generated noise control signals for at least partially reducing the noise caused associated with the breathing assistance system.

27. A method for controlling noise associated with a breathing assistance system, the method comprising:

using a first sensor to detect noise caused by a noise source of a breathing assistance system;

communicating the detected noise as reference signals to a processor;

using a speaker to output noise control signals for at least partially canceling the noise caused by the noise source;

using a second sensor to detect (a) noise caused by the noise source and (b) noise control signals output by the speaker;

communicating to the processor feedback signals based on the noise detected by the second sensor; and

using the processor to generate noise control signals for output by the speaker based at least on the received reference signals and feedback signals.

28. A method according to claim 27, wherein the noise source comprises a gas delivery system.

29. A method according to claim 27, wherein the noise source comprises a motorized blower.

30. A method according to claim 27, wherein the noise control signals provide both noise cancellation and noise leveling functions, wherein noise leveling comprises leveling the perceived noise over a plurality of breath cycles.

31. A breathing assistance system having active noise control, the system comprising:

gas delivery means for supplying breathing gas;

patient interfacing means for interfacing with a patient for delivering breathing gas to one or more breathing passages of the patient;

gas communication means for communicating breathing gas supplied by the gas delivery means to the patient interfacing means for delivery to the patient; and

noise controlling means for controlling noise caused by a noise source associated with the breathing assistance system, the noise controlling means including;

processing means for generating noise control signals for at least partially canceling noise caused by the noise source;

reference signal communication means for communicating to the processor reference signals associated with the noise source;

sound output means for outputting the noise control signals generated by the processor for at least partially canceling noise caused by the noise source; and

feedback communication means for detecting noise caused by the noise source and noise control signals output by the speaker, and communicating to the processor feedback noise signals based on the detected noise;

wherein the processing means is configured to generate the noise control signals based at least on the reference signals and the feedback noise signals.