Adaptive patient trigger threshold detection

• US 7,487,774 B2
• Filed: 08/05/2005
• Issued: 02/10/2009
• Est. Priority Date: 08/05/2005
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Acker, Jaron M.
• Primary Examiner(s): Yu; Justine R
• Assistant Examiner(s): OSTRUP, CLINTON T
• Application Number:
  US11/197,838
• Publication Number:
  US 20070028920A1
• Time in Patent Office: 1,285 Days
• Field of Search: 128/204.21, 128/200.24, 128/204.18, 128/204.22, 128/204.23, 128/204.26, 128/905, 128/920
• US Class Current: 128/204.18
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2016/0042 in the expiratory circuit
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards

Abstract

The present invention is a method and system for adaptively detecting a patient trigger threshold. The system and method uses fuzzy-logic control algorithm to detect an appropriate trigger threshold by monitoring the number of patient triggers within a predetermined time frame. The system and method also detects an appropriated trigger threshold by monitoring the complete absence of false triggers over a predetermined time frame, increases in average flow, increases in pressure differential, and pressure drop, in order to lower the trigger threshold. The method and system of the present invention is selectable to the user, and adaptively changes the inspiratory trigger threshold.

Claims

1. A method of adjusting an inspiratory trigger threshold level of a patient ventilator having a trigger menu, the method comprising:

manually selecting an auto position on the trigger menu of the patient ventilator;

receiving into a processor of the patient ventilator a set of detected data from a flow sensor and a pressure sensor, wherein the set of detected data includes an inspiratory flow component, an expiratory flow component, and a pressure component;

calculating a set of patient data in the processor with the set of detected data, wherein the set of patient data includes a net flow component, a net flow derivative, a volume component and the pressure component;

using a fuzzy logic control algorithm to calculate a control signal with the set of patient data in the processor, wherein the control signal corresponds to an adjusted inspiratory trigger threshold level; and

sending the control signal to a controller of the patient ventilator such that the controller adjusts the inspiratory trigger threshold level of the patient ventilator to reflect the adjusted inspiratory trigger threshold level, wherein the inspiratory trigger threshold level is adjusted according to the method to prevent false triggers.

2. The method as claimed in claim 1, wherein the set of patient data is calculated with a signal processing algorithm in the processor and the control signal is calculated with the fuzzy logic control algorithm, and further wherein the fuzzy logic control algorithm is used by the processor to execute the adjustment of the inspiratory trigger threshold level.

3. The method of claim 1, further comprising displaying the set of patient data on a display device coupled to the patient ventilator.

4. The method as claimed in claim 1, further comprising limiting an adaptive inspiratory trigger adjustment amount to a band specified by a user.

5. A system for adjusting an inspiratory trigger threshold level of a patient ventilator, the system comprising:

a trigger menu of the patient ventilator, wherein the trigger menu is set to an auto position manually;

a flow sensor and a pressure sensor configured to collect a set of detected data, wherein the detected data includes an inspiratory flow component, an expiratory flow component, and a pressure component;

a processor, coupled to the sensor, wherein the processor receives the detected data and calculates a set of patient data with the set of detected data, wherein the patient data includes a net flow component, a net flow derivative, a volume component and the pressure component, and further uses a fuzzy logic control algorithm to calculate a control signal with the set of patient data, and further wherein the control signal corresponds to an adjusted inspiratory trigger threshold level; and

a controller coupled to the processor and configured to receive the control signal, wherein the controller adjusts the inspiratory trigger threshold level of the patient ventilator to reflect the adjusted inspiratory trigger threshold level, wherein the inspiratory trigger threshold level is adjusted to prevent false triggers.

6. The system as claimed in claim 5, further comprising a display coupled to the patient ventilator, wherein the display is configured to display the set of detected data and the set of patient data.

7. The system as claimed in claim 5, wherein the processor applies an algorithm to calculate the control signal.

8. A method of adjusting an inspiratory trigger threshold of a patient ventilator having a trigger menu, the method comprising:

manually selecting an auto position on a the trigger menu of the patient ventilator;

receiving into a processor of the patient ventilator a set of detected data from a flow sensor and a pressure sensor, wherein the set of detected data includes an inspiratory flow component, an expiratory flow component, and a pressure component;

calculating a set of patient data in the processor with the set of detected data, wherein the set of patient data includes a net flow component, a net flow derivative, a volume component and the pressure component;

using a fuzzy logic control algorithm to calculate a control signal with the set of patient data in the processor, wherein the control signal corresponds to an adjusted inspiratory trigger threshold level;

sending the control signal from the processor to a controller;

adjusting the inspiratory trigger threshold level of the patient ventilator with the controller to the adjusted inspiratory trigger threshold level, wherein the inspiratory trigger threshold level is adjusted according to the method to prevent false triggers; and

displaying the set of patient data and the set of detected data on a device coupled to the patient ventilator.