Nuisance alarm reduction method for therapeutic parameters

• US 9,411,494 B2
• Filed: 02/11/2013
• Issued: 08/09/2016
• Est. Priority Date: 01/19/2010
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Baker, Clark R. Jr.
• Primary Examiner(s): Chow, Doon
• Assistant Examiner(s): Varga, Wilson
• Application Number:
  US13/763,852
• Publication Number:
  US 20130159912A1
• Time in Patent Office: 1,275 Days
• US Class Current: 1/1
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0063 Compressors
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/12 by mixing different gases
• CPC Class Codes: A61M 2016/0018 electrical
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2016/1025 the O2 concentration
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: G06F 3/0484 for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
• CPC Class Codes: G16H 40/63 for local operation

Abstract

This disclosure describes systems and methods for reducing nuisance alarms associated with monitoring non-physiological parameters in a ventilatory system. Non-physiological parameters may include, but are not limited to, parameters that are internally monitored by the ventilator based on pre-configured ranges dictated by the manufacturer, by an applicable protocol, or by the clinician. Embodiments described herein seek to mitigate nuisance alarms by basing alarm conditions, at least in part, on an integral threshold such that an alarm is not generated when a monitored parameter briefly falls outside an acceptable range by a slight degree, but such that an alarm is generated when a monitored parameter falls outside an acceptable range by a more significant magnitude and/or duration.

Claims

1. A method for reducing nuisance alarms implemented on a ventilator having a processor and a memory, the method comprising:

receiving one or more alarm conditions, wherein the one or more alarm conditions include a parameter threshold and an integral threshold;

monitoring at least one non-physiological parameter;

detecting a first breach of the parameter threshold;

calculating an integral of the first breach;

when the integral of the first breach is not greater than the integral threshold, applying a weighted constant to the integral of the first breach to incrementally reduce the integral of the first breach;

calculating an integral of a second breach; and

generating an alarm when the integral of the second breach plus the incrementally reduced integral of the first breach is greater than the integral threshold.

2. The method of claim 1, wherein the at least one non-physiological parameter is selected from a group consisting of:

FiO₂, CO, Percent Support, Pressure Support, circuit pressure, circuit flow, and one or more infusates.

3. The method of claim 1, wherein when the integral of the first breach is not greater than the integral threshold, the method further comprising:

applying the weighted constant to incrementally reduce the integral of the first breach over a predetermined period of time.

4. The method of claim 1, wherein when the integral of the first breach is greater than the integral threshold, the method further comprising:

generating an alarm; and

zeroing out the integral of the first breach.

5. The method of claim 1, wherein when the integral of the second breach plus the incrementally reduced integral of the first breach is greater than the integral threshold, the method further comprising:

zeroing out the incrementally reduced integral of the first breach plus the integral of the second breach.

6. The method of claim 1, wherein the one or more alarm conditions are received via voice activation.

7. A ventilator, comprising:

at least one processor; and

at least one memory, communicatively coupled to the at least one processor and containing instructions that, when executed by the at least one processor, cause the ventilator system to;

receive one or more alarm conditions, wherein the one or more alarm conditions include a parameter threshold and an integral threshold;

monitor at least one non-physiological parameter;

detect a first breach of the parameter threshold;

calculate an integral of the first breach;

when the integral of the first breach is not greater than the integral threshold, apply a weighted constant to the integral of the first breach to incrementally reduce the integral of the first breach;

calculate an integral of a second breach; and

generate an alarm when the integral of the second breach plus the incrementally reduced integral of the first breach is greater than the integral threshold.

8. The ventilator of claim 7, wherein the at least one non-physiological parameter is selected from a group consisting of:

FiO₂, CO, Percent Support, Pressure Support, circuit pressure, circuit flow, and one or more infusates.

9. The ventilator of claim 7, wherein when the integral of the first breach is not greater than the integral threshold, the instructions further causing the ventilator system to:

apply the weighted constant to incrementally reduce the integral of the first breach over a predetermined period of time.

10. The ventilator of claim 7, wherein when the integral of the first breach is greater than the integral threshold, the instructions further causing the ventilator system to:

generate an alarm; and

zero out the integral of the first breach.

11. The ventilator of claim 7, wherein when the integral of the second breach plus the incrementally reduced integral of the first breach is greater than the integral threshold, the instructions further causing the ventilator system to:

zero out the incrementally reduced integral of the first breach plus the integral of the second breach.

12. The ventilator of claim 7, wherein the one or more alarm conditions are received via voice activation.

13. A ventilator, comprising:

at least one processor; and

at least one memory, communicatively coupled to the at least one processor and containing instructions that, when executed by the at least one processor, cause the ventilator system to;

receive one or more alarm conditions, wherein the one or more alarm conditions include a parameter threshold and an integral threshold;

monitor at least one non-physiological parameter;

detect a first breach of the parameter threshold;

calculate an integral of the first breach;

detect a second breach of the parameter threshold when the integral of the first breach is not greater than the integral threshold;

calculate an integral of the second breach;

apply a weighted constant to the integral of the first breach to incrementally reduce the integral of the first breach;

add the incrementally reduced integral of the first breach to the integral of the second breach; and

generate an alarm when the sum of the incrementally reduced integral of the first breach and the integral of the second breach is greater than the integral threshold.

14. The ventilator of claim 13, wherein the at least one non-physiological parameter is selected from a group consisting of:

FiO₂, CO, Percent Support, Pressure Support, circuit pressure, circuit flow, and one or more infusates.

15. The ventilator of claim 13, wherein when the integral of the first breach is not greater than the integral threshold, the instructions further causing the ventilator system to:

apply the weighted constant to incrementally reduce the integral of the first breach over a predetermined period of time.

16. The ventilator of claim 13, wherein when an alarm is generated, the instructions further causing the ventilator system to:

zero out the incrementally reduced integral of the first breach and the integral of the second breach.

17. The ventilator of claim 13, wherein the one or more alarm conditions are received via voice activation.

18. The ventilator of claim 13, the instructions further causing the ventilator system to:

generate an alarm when the integral of the first breach is greater than the integral threshold.