Nuisance alarm reduction method for therapeutic parameters

• US 8,400,290 B2
• Filed: 01/19/2010
• Issued: 03/19/2013
• 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): Nguyen, Tai T
• Application Number:
  US12/689,900
• Publication Number:
  US 20110175728A1
• Time in Patent Office: 1,155 Days
• Field of Search: 340/500, 340/611, 340/614, 340/626, 340/679, 128/202.16, 128/204.18, 128/205.25, 600/300, 600/301, 600/323, 600/324, 600/365
• US Class Current: 340/500
• 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 while monitoring one or more non-physiological parameters in a ventilatory system, the method comprising:

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

monitoring at least one parameter of the one or more non-physiological parameters;

detecting a breach of the parameter threshold;

calculating an integral of the breach;

determining whether the integral of the breach is greater than the integral threshold

detecting an additional breach of the parameter threshold;

calculating an integral of the additional breach;

adding an incrementally reduced integral of the breach to the integral of the additional breach; and

generating an alarm when the incrementally reduced integral of the breach and the integral of the additional breach are greater than the integral threshold.

2. The method of claim 1, further comprising:

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

3. The method of claim 1, wherein the one or more non-physiological parameters are selected from a group consisting of:

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

4. The method of claim 1, wherein when the integral of the breach is not greater than the integral threshold, the integral of the breach is incrementally reduced over a predetermined period of time.

5. The method of claim 1, wherein when an alarm is generated, zeroing out the incrementally reduced integral of the breach and the integral of the additional breach.

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

7. A ventilatory system for reducing nuisance alarms while monitoring one or more non-physiological parameters, 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, perform a method comprising;

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

monitoring at least one parameter of the one or more non-physiological parameters;

detecting a first breach of the parameter threshold;

calculating a first integral of the first breach;

determining whether the first integral of the first breach is greater than the integral threshold;

when the first integral of the first breach is not greater than the integral threshold, incrementally reducing the first integral of the first breach over a predetermined period of time;

detecting a second breach of the parameter threshold;

calculating a second integral of the second breach; and

determining whether a sum of the incrementally reduced first integral plus the second integral is greater than the integral threshold.

8. The system of claim 7, further comprising:

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

9. The system of claim 8, wherein when an alarm is generated, zeroing out the incrementally reduced first integral and the second integral.

10. The system of claim 7, wherein the one or more non-physiological parameters are selected from a group consisting of:

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

11. The system of claim 7, wherein alarm conditions are received via voice activation.