Automated stop/start control in the administration of CPAP treatment

• US 6,240,921 B1
• Filed: 04/22/1997
• Issued: 06/05/2001
• Est. Priority Date: 12/01/1993
• Status: Expired due to Term

• Current Assignee: Resmed Limited (ResMed Incorporated)
• Original Assignee: Resmed Limited (ResMed Incorporated)
• Inventors: Calluaud, Michel, Brydon, John William Ernest
• Primary Examiner(s): Dawson, Glenn K.
• Assistant Examiner(s): Weiss, Jr., Joseph F.
• Application Number:
  US08/837,672
• Time in Patent Office: 1,505 Days
• Field of Search: 128/202.22, 128/204.18, 128/204.21, 128/204.22, 128/204.23, 128/204.24, 128/205.23, 128/205.25
• US Class Current: 128/205.23
• 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 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2039/1005 Detection of disconnection
• CPC Class Codes: A61M 2205/13 with means for the detection of operative contact with patient, e.g. lip sensor
• CPC Class Codes: A61M 2205/3561 local, e.g. within room or hospital

Abstract

Method for automatic stop-start control of a breathing apparatus. Automatic starting and stopping of the device based upon the determination of a user wearing the mask by way of proximity sensors determining that a user is physically in contact with the mask in order to start the device and stopping the device when the proximity sensors determine the user is not in physical contact with the mask.

Claims

1. A method for controlling an apparatus for the administration of continuous positive airway pressure (CPAP) treatment, the apparatus having a controllable flow generator coupled to an air delivery circuit, in turn coupled to a mask for the supply of CPAP treatment to a patient'"'"'s airways, the method comprising the steps of:

determining that the patient is wearing said mask, and if being worn controlling commencement of the administration of CPAP treatment by activating said flow generator, said determining steps comprising;

(a) detecting flow of air in said air delivery circuit;

(b) detecting a pressure change in said air delivery circuit; and

(c) detecting proximity of the patient'"'"'s face with said mask.

2. A method for controlling an apparatus for the administration of continuous positive airway pressure (CPAP) treatment, the apparatus having a controllable flow generator coupled to an air delivery circuit, in turn coupled to a mask for the supply of CPAP treatment to a patient'"'"'s airways, the method comprising the steps of:

determining that the patient is wearing said mask, and if being worn commencing the administration of CPAP treatment, said determining steps comprising;

(a) detecting flow of air in said air delivery circuit;

(b) detecting a pressure change in said air delivery circuit; and

(c) detecting proximity of the patient'"'"'s face with said mask,

wherein said detecting flow of air comprises the steps of detecting a change in pressure drop along at least a portion of said air delivery circuit, comparing said change in pressure drop against a threshold, and if said threshold is exceeded it is determined there is air flow.

3. A method for controlling an apparatus for the administration of continuous positive airway pressure (CPAP) treatment, the apparatus having a controllable flow generator coupled to an air delivery circuit, in turn coupled to a mask for the supply of CPAP treatment to a patient'"'"'s airways, the method comprising the steps of:

determining that the patient is wearing said mask, and if being worn commencing the administration of CPAP treatment, said determining steps comprising;

(a) detecting flow of air in said air delivery circuit;

(b) detecting a pressure change in said air delivery circuit; and

(c) detecting proximity of the patient'"'"'s face with said mask,

wherein said detecting a pressure change comprises the steps of measuring mask pressure or pressure at a point along said air delivery circuit, detecting a change in said measured pressure, comparing said change in pressure against a threshold, and if said threshold is exceeded it is determined that the mask is being worn.

4. A method for controlling an apparatus for the administration of continuous positive airway pressure (CPAP) treatment, the apparatus having a controllable flow generator coupled to an air delivery circuit, in turn coupled to a mask for the supply of CPAP treatment to a patient'"'"'s airways, the method comprising the steps of:

determining that the patient is wearing said mask, and if being worn commencing the administration of CPAP treatment, said determining steps comprising;

(a) detecting flow of air in said air delivery circuit;

(b) detecting a pressure change in said air delivery circuit; and

(c) detecting proximity of the patient'"'"'s face with said mask, to the

wherein said detecting proximity of said mask to the patient'"'"'s face comprises the step of detecting a change in electrical characteristics of circuit means mounted from said mask.

5. The method as claimed in claim 4, wherein said characteristics of said circuit means include the resistance between two electrodes, the capacitance between two electrodes, or the inductance of a coil means.