Sleep apnea treatment apparatus having multiple ramp cycles

• US 5,492,113 A
• Filed: 08/23/1993
• Issued: 02/20/1996
• Est. Priority Date: 11/01/1991
• Status: Expired due to Term

• Current Assignee: RIC INVESTMENTS LLC (Respironics Incorporated)
• Original Assignee: Respironics Incorporated
• Inventors: Estes, Mark C., Mechlenburg, Douglas M., Cattano, Janice M.
• Primary Examiner(s): Asher, Kimberly L.
• Application Number:
  US08/110,537
• Time in Patent Office: 911 Days
• Field of Search: 128/204.8, 128/204.21-204.23, 128/204.26, 128/205.25, 128/716, 128/719
• US Class Current: 128/204.23
• 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 16/024 including calculation means, e.g. using a processor
• 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 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2205/15 Detection of leaks
• CPC Class Codes: A61M 2205/3561 local, e.g. within room or hospital
• CPC Class Codes: A61M 2230/60 Muscle strain, i.e. measured on the user

Abstract

Improved methodology and apparatus for the treatment of sleep apnea through (1) application of alternating high and low level positive airway pressure within the airway of the patient with the high and low airway pressure being coordinated with the spontaneous respiration of the patient, (2) usage of adjustably programmable pressure ramp circuitry capable of producing multiple pressure ramp cycles of predetermined duration and pattern whereby the ramp cycles may be customized to accommodate the specific needs of an individual sleep apnea patient so as to ease the patient'"'"'s transition from wakefulness to sleep, and (3) remote control or patient-sensed operation of the apparatus for assisting those patients whose mobility or capacity for physical exertion is intrinsically limited.

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 said gas;

conduit means for delivery of said gas flow to the airway of said patient;

pressure controller means cooperable with said gas flow generator means to provide for flow of said gas within said conduit means and within the airway of said patient at selectively variable, continuously administered positive airway pressure levels, during inhalation and exhalation of the patient;

ramp control circuitry means operatively connected to said pressure controller means for effecting (1) a first ramp cycle wherein said gas flow from said pressure controller means is initially output at a first continuously administered positive airway pressure level and raises with time to a second continuously administered positive airway pressure level, said first ramp cycle extending over multiple patient breathing cycles and (2) at least one additional ramp cycle for selective activation, wherein said at least one additional ramp cycle comprises gas flow from said pressure controller means being initially output at said first continuously administered positive airway pressure level and raising with time to said second continuously administered positive airway pressure level, said at least one additional ramp cycle extending over multiple patient breathing cycles; and

ramp activation means in communication with said ramp control circuitry means for enabling selective activation of said ramp control circuitry means to effect at least one of said first ramp cycle and said at least one additional ramp cycle.

2. The apparatus of claim 1 further comprising means associated with said ramp control circuitry means for adjusting the magnitude of said first pressure.

3. The apparatus of claim 2 further comprising means associated with said ramp control circuitry means for adjusting the magnitude of said second pressure.

4. The apparatus of claim 3 further comprising means associated with said ramp control circuitry means for adjusting the duration of said first ramp cycle.

5. The apparatus of claim 4 further comprising means associated with said ramp control circuitry means for selecting a fraction of an adjusted duration of said first ramp cycle as established by said means for adjusting the duration of said first ramp cycle.

6. The apparatus of claim 5 wherein said means for selecting a fraction of an adjusted duration of said first ramp cycle permits selection of a fraction of said adjusted duration from zero up to and including said adjusted duration.

7. The apparatus of claim 5 further comprising means associated with said ramp control circuitry means for adjusting the duration of said at least one additional ramp cycle.

8. The apparatus of claim 7 wherein said means for adjusting the duration of said at least one additional ramp cycle permits adjustment of the duration of said at least one additional ramp cycle from substantially zero up to and including said adjusted duration.

9. The apparatus of claim 3 wherein said second pressure comprises at least one prescription pressure unique to said patient.

10. The apparatus of claim 9 wherein said at least one prescription pressure includes an inspiratory gas flow pressure provided by said pressure controller means during inspiration by said patient and an expiratory gas flow pressure provided by said pressure controller means during expiration by said patient.

11. The apparatus of claim 10 wherein said first pressure comprises at least one minimum ramp pressure.

12. The apparatus of claim 11 wherein said at least one minimum ramp pressure includes a minimum ramp pressure of a ramp cycle associated with said inspiratory gas flow pressure and a minimum ramp pressure of a ramp cycle associated with said expiratory gas flow pressure.

13. The apparatus of claim 1 further comprising means associated with said ramp control circuitry means for establishing a predetermined pattern of pressure output from said pressure controller means as said pressure progresses from said first pressure to said second pressure.

14. The apparatus of claim 13 further comprising means associated with said ramp control circuitry means for establishing a pattern of pressure output from said pressure controller means different than said predetermined pattern during said at least one additional ramp cycle.

15. The apparatus of claim 1 further comprising a remote control operable by said patient, said remote control including said ramp activation means.

16. The apparatus of claim 15 wherein said remote control further includes means for selectively activating said apparatus.

17. The apparatus of claim 16 wherein said remote control comprises a first actuator having a first configuration and adapted to be operated by said patient to activate said apparatus and a second actuator having a second configuration substantially different than said first configuration and adapted to activate said ramp control circuitry means, whereby said patient can reliably identify and operate said first and second actuators by sense of touch.

18. The apparatus of claim 1 further comprising sensor means in communication with at least one of said patient, said conduit means and said gas flow generator means for generating a signal to activate said gas flow generator means upon detection of a condition associated with the presence of said patient.

19. The apparatus of claim 1 further comprising sensor means in communication with at least one of said patient, said conduit means and said gas flow generator means for generating a signal to deactivate said gas flow generator means upon failing to detect a condition associated with the presence of said patient.

20. The apparatus of claims 18 or 19 wherein said sensor means is selected from the group comprising pressure, flow, thermal, audio, optic, electrical current, voltage, force and displacement transducers.

21. The apparatus of claim 1 wherein said ramp activation means comprise sensor means for detecting signals consciously produced by said patient and for generating a signal responsive to said consciously produced signals for selectively activating said ramp control circuitry means.

22. The apparatus of claim 1 wherein said ramp activation means comprise a pressure transducer means for detecting pressure produced by said patient and for generating a signal responsive to said pressure for selectively activating said ramp control circuitry means.

23. The apparatus of claim 22 wherein said pressure consists of sound waves associated with speech.

24. The apparatus of claim 22 wherein said pressure transducer means is a microphone.

25. The apparatus of claim 1 further comprising means for generating a substantially stabilized pressurized gas leakage signal and wherein said ramp activation means comprise means for automatically commencing said first ramp cycle upon detection of a substantially stabilized pressurized gas leakage signal generated by said means for generating such signal.

26. The apparatus of claim 25 wherein said means for generating a substantially stabilized pressurized gas signal comprise a low pass filter.

27. The apparatus of claim 25 wherein said means for generating a substantially stabilized pressurized gas leakage signal comprise an estimated leak computer.