SYSTEM AND METHOD FOR PROVIDING A BREATHING GAS

• US 20100065055A1
• Filed: 11/23/2009
• Published: 03/18/2010
• Est. Priority Date: 06/23/2003
• Status: Active Grant

• Current Assignee: Ventec Life Systems, Inc.
• Original Assignee: Invacare Corporation
• Inventors: Flolid, Gregory William, Morris, Make, Curran, Neal Joseph
• Granted Patent: US 8,066,004 B2
• Time in Patent Office: Days
• US Class Current: 128/204.220
• CPC Class Codes: A61M 16/00 Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes stimulating the respiratory movement by mechanical, pneumatic or electrical means, iron lungs combined with gas breathing means A61H31/00
• 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 16/107 in the inspiratory path
• 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 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2230/005 Parameter used as control input for the apparatus
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)

Abstract

Systems and methods for providing a breathing gas are provided. In one embodiment, the method includes sensing a sensed parameter associated with delivery of the breathing gas, changing a control parameter associated with a flow/pressure control element in response to a difference between the sensed parameter and a first predetermined sensed parameter value during a first portion of a breathing cycle, determining a transition from the first portion to a second portion of the breathing cycle based at least in part on the changing control parameter, changing the control parameter to cause a first change in the sensed parameter during the second portion of the breathing cycle based at least in part on the determined transition, and changing the control parameter to cause a second change in the sensed parameter during a third portion of the breathing cycle based at least in part on the first predetermined sensed parameter value.

Claims

1-60. -60. (canceled)

61. A system for providing a breathing gas comprising:

a flow path adapted to receive a patient interface;

a blower in fluidic communication with the flow path;

a variable position valve in fluidic communication with the flow path;

a pressure sensor disposed to detect a pressure associated with delivery of breathing gas to the patient interface; and

a controller in operative communication with the pressure sensor, blower, and variable position valve, wherein the controller controls the variable position valve to provide the breathing gas;

i) at a first breathing gas pressure during a first portion of a patient breathing cycle, ii) at a second breathing gas pressure during a second portion of the patient breathing cycle, and iii) at the first breathing gas pressure during a third portion of the patient breathing cycle.

62. The system of claim 61 wherein the variable position valve selectively diverts breathing gas from the flow path.

63. The system of claim 62 wherein the variable position valve directs the diverted breathing gas to a non-ambient input associated with the blower.

64. The system of claim 61 wherein the first portion of the patient breathing cycle is associated with an inhalation state.

65. The system of claim 61 wherein the second portion of the patient breathing cycle is associated with an unload portion of an exhalation state.

66. The system of claim 61 wherein the third portion of the patient breathing cycle is associated with a load portion of an exhalation state.

74. The system of claim 61 wherein the controller changes a control parameter associated with the variable position valve to provide the breathing gas.

75. The system of claim 74 wherein the control parameter includes a valve step position.

67-73. -73. (canceled)

76. A system for providing a breathing gas comprising:

a flow path adapted to receive a patient interface;

at least one flow/pressure control element in fluidic communication with the flow path;

at least one sensor element disposed to detect a sensed parameter associated with delivery of the breathing gas; and

a controller in operative communication with the at least one flow/pressure control element and the at least one sensor element, wherein the controller controls the at least one flow/pressure control element to provide the breathing gas;

i) at a first breathing gas pressure during a first portion of a patient breathing cycle, ii) at a second breathing gas pressure during a second portion of the patient breathing cycle, and iii) at the first breathing gas pressure during a third portion of the patient breathing cycle.

77. The system of claim 76 wherein the flow/pressure control element comprises any one or any two or more of the following:

a variable position valve, a variable speed blower, a linear valve, a solenoid valve, and a stepper motor controlled variable position valve.

78. The system of claim 76 wherein the sensor element comprises any one or any two or more of the following:

a pressure sensor, a flow sensor, a temperature sensor, an infra-red light emitter/sensor, a motor current sensor, and a motor speed sensor.

79. The system of claim 76 wherein the sensed parameter comprises any one or any two or more of the following:

breathing gas pressure, breathing gas flow, breathing gas temperature, breathing gas composition, motor current, and motor speed.

80. The system of claim 76 wherein the at least one flow/pressure control element selectively diverts breathing gas from the flow path.

81. The system of claim 76 wherein the first portion of the patient breathing cycle is associated with an inhalation state.

82. The system of claim 76 wherein the second portion of the patient breathing cycle is associated with an unload portion of an exhalation state.

83. The system of claim 76 wherein the third portion of the patient breathing cycle is associated with a load portion of an exhalation state.

84. The system of claim 76 wherein the controller changes a control parameter associated with the at least one flow/pressure control element to provide the breathing gas.

85. The system of claim 84 wherein the control parameter includes a valve step position.

86. The system of claim 84 wherein the control parameter includes a blower speed.