Sleep apnea treatment apparatus and passive humidifier for use therewith

• US 5,537,997 A
• Filed: 06/07/1995
• Issued: 07/23/1996
• Est. Priority Date: 01/26/1995
• Status: Expired due to Term

• Current Assignee: RIC INVESTMENTS LLC (Koninklijke Philips N.V.)
• Original Assignee: Respironics Incorporated (Koninklijke Philips N.V.)
• Inventors: Mechlenburg, Douglas M., Kimmel, Steven A., Fiore, John H.
• Primary Examiner(s): Lewis, Aaron J.
• Application Number:
  US08/484,526
• Time in Patent Office: 412 Days
• Field of Search: 128/204.18, 128/204.21, 128/204.23, 128/716, 128/203.16, 128/205.23
• US Class Current: 128/204.23
• CPC Class Codes: A61M 16/0051 with alarm devices
• 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 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• 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

Abstract

Apparatus for delivering pressurized gas to the airway of a patient including: a gas flow generator for providing a flow of gas, a breathing appliance for sealingly communicating with the airway of the patient, and a conduit for delivery of the gas flow to the airway of the patient, the conduit having a first end connected to the gas flow generator and a second end connected to the breathing appliance. The apparatus further includes at least one sensor in fluid communication with the conduit and located substantially at the gas flow generator for detecting conditions corresponding to breathing patterns of the patient and generating signals corresponding to the conditions, and an information processor for receiving the signals and for controlling the output of the gas flow generator responsive to the signals. The apparatus further includes a humidifier connected to the gas flow generator for moisturizing a flow of pressurized gas provided by the gas flow generator and includes an outlet chamber including a diameter transition portion and a dissipation hole for acoustically tuning snoring sounds received by the patient.

Claims

1. Apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising:

gas flow generator means for providing a flow of pressurized gas;

an acoustically compatible humidifier means connected to said gas flow generator means for moisturizing the flow of pressurized gas provided by said gas flow generator means, said humidifier means comprising a means for optimally transmitting sound frequencies falling within a frequency range which is known to be associated with upper airway obstructions;

patient interface means for sealingly communicating with the airway of a patient;

conduit means for delivery of said gas flow to the airway of a patient, said conduit means having a first end connected to said humidifier means and a second end connected to said patient interface means;

sensor means in fluid communication with said conduit means and located substantially at said gas flow generator means for detecting conditions corresponding to breathing patterns of a patient and generating signals corresponding to said conditions, said sensor means being acoustically tuned to optimally transmit sound frequencies falling within a frequency range which is known to be associated with upper airway obstructions; and

information processing means for receiving said signals and for controlling the output of said gas flow generator means responsive to said signals.

2. The apparatus of claim 1 wherein the means for optimally transmitting sound frequencies comprises an outlet chamber having a diameter transition portion, the position of the diameter transition portion along the length of the outlet chamber controlling the resonant frequency such that an optimal resonant frequency is achieved.

3. The apparatus of claim 1 wherein the means for optimally transmitting sound frequencies comprises an outlet chamber having a dissipation means for dissipating energy stored in each oscillation cycle of snore sound in the outlet chamber to adjust the quality factor (Q) of the outlet chamber to be comparable to the Q of an apparatus for delivering pressurized gas to the airway of a patient which does not include a humidifier means.

4. The apparatus of claim 3 wherein the dissipation means comprises a dissipation hole extending from an outlet chamber inlet to an outlet portion of the outlet chamber.

5. Apparatus for delivering pressurized gas to the airway of a patient, said apparatus comprising:

gas flow generator means for providing a flow of said gas;

an acoustically compatible humidifier means connected to said gas flow generator means for moisturizing the flow of pressurized gas provided by said gas flow generator means, said humidifier means comprising a means for optimally transmitting sound frequencies falling within a frequency range which is known to be associated with upper airway obstructions;

patient interface means for sealingly communicating with the airway of a patient;

first conduit means for delivery of said gas flow to the airway of a patient, said conduit means having a first end connected to said humidifier means and a second end connected to said patient interface means;

sensor means in fluid communication with said conduit means for detecting conditions corresponding to breathing patterns of a patient and generating signals corresponding to said conditions;

second conduit means for communicating said conditions to said sensor means, said second conduit means having one end communicating with said sensor means and an opposite end communicating with said conduit means and located substantially at said humidifier means, said second conduit means being acoustically tuned to optimally transmit sound frequencies falling within a range which is known to be associated with upper airway obstructions;

information processing means for receiving said signals and for controlling the output of said gas flow generator means responsive to said signals.

6. The apparatus of claim 5 wherein the means for optimally transmitting sound frequencies comprises an outlet chamber having a diameter transition portion, the position of the diameter transition portion along the length of the outlet chamber controlling the resonant frequency such that an optimal resonant frequency is achieved.

7. The apparatus of claim 5 wherein the means for optimally transmitting sound frequencies comprises an outlet chamber having a dissipation means for dissipating energy stored in each oscillation cycle of snore sound in the outlet chamber to adjust the quality factor (Q) of the outlet chamber to be comparable to the Q of an apparatus for delivering pressurized gas to the airway of a patient which does not include a humidifier means.

8. The apparatus of claim 7 wherein the dissipation means comprises a dissipation hole extending from an outlet chamber inlet to an outlet portion of the outlet chamber.