System and method for detecting signal artifacts

• US 20060247501A1
• Filed: 08/06/2004
• Published: 11/02/2006
• Est. Priority Date: 08/20/2003
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Ali, Walid
• Granted Patent: US 8,602,986 B2
• Time in Patent Office: Days
• US Class Current: 600/300
• CPC Class Codes: A61B 5/02 Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
• CPC Class Codes: G06F 18/00 Pattern recognition
• CPC Class Codes: G06F 2218/02 Preprocessing

Abstract

A method and system are disclosed that detect signal artifacts in one or more event signals. The system and method may be used with a patient monitoring apparatus that adapts to a patient'"'"'s condition and distinguishes between clinically significant changes in the patient'"'"'s state verse clinically insignificant changes.

Claims

1. A device comprising:

a controller;

a memory coupled to the controller; and

an input interface arranged to received at least two event signals,

wherein the controller is arranged to determine a global correlation for the at least two event signal over a first period of time, determine a local corrlation for the at least two event signals over a second period of time which is shorter than the first period of time, determine a deviation between a local correlation vector and a global correlation vector, determine an average deviation from the deviation and determine whether an artifact was detected in one of the at least two event signals.

2. The device according to claim 1 wherein the device is a patient monitoring system.

3. The device according to claim 2 wherein the at least two event signals are patient monitored data signals.

4. The device according to claim 3 further comprising an alarm indicator coupled to the controller, the alarm indicator being triggered if at least one of the event signals crosses a preset threshold value and the controller determines that no artifact was detected in the at least one event signal.

5. The device according to claim 1 further comprising a memory for recording the at least tow event signals.

6. The device according to claim 1, wherein the device is a server forming part of a client-server network.

8. The method according to claim 1 wherein the method is used with a patient monitoring system.

9. The method according to claim 8 wherein the at least two event signals are patient monitored data signals.

10. The method according to claim 9 further comprising the step of providing an alarm indication if at least one of the event signals crosses a preset threshold value and no artifact was detected in the at least one event signal.

7. A method for detecting a signal artifact in an event signal, the method comprising the steps of:

receiving at least two event signals;

determining a global correlation for the at least two event signal over a first period of time;

determining a local corrlation for the at least two event signals over a second period of time which is shorter than the first period of time;

determining a deviation between a local correlation vector and a global correlation vector;

determining an average deviation from the deviation; and

determining whether an artifact was detected in one of the at least two event signals based upon the average deviation.

11. The method according to claim 7 further comprising the step of recording the at least two event signals.

12. The method according to claim 7, wherein the method is used in a server forming part of a client-server network.

13. A system for detecting a signal artifact in an event signal comprising:

means for receiving at least two event signals;

means for determining a global correlation for the at least two event signal over a first period of time;

means for determining a local corrlation for the at least two event signals over a second period of time which is shorter than the first period of time;

means for determining a deviation between a local correlation vector and a global correlation vector;

means for determining an average deviation from the deviation; and

means for determining whether an artifact was detected in one of the at least two event signals based upon the average deviation.

14. The system according to claim 13 wherein the system is a patient monitoring system.

15. The system according to claim 14 wherein the at least two event signals are patient monitored data signals.