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Variable bandwidth ecg high pass filter.

A high-pass filter and low-pass filter technology, used in sensors, cardiac defibrillators, baseband system components, etc., can solve problems such as increased computational complexity and ECG waveform distortion

Active Publication Date: 2016-08-24
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second disadvantage is the amount of computation required
A simple IIR filter with this high corner frequency distorts the ECG waveform very substantially
A FIR filter with this corner frequency will minimize the distortion of the ECG, but will require a significant increase in computation

Method used

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  • Variable bandwidth ecg high pass filter.
  • Variable bandwidth ecg high pass filter.
  • Variable bandwidth ecg high pass filter.

Examples

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Embodiment Construction

[0021] To facilitate understanding of the present invention, an exemplary embodiment of the present invention relating to an ECG high pass filter for a defibrillator will be provided herein.

[0022] refer to figure 1 Defibrillator 20 of the present invention employs a pair of electrode pads or pads 21 , optional ECG leads 22 , ECG monitor 23 (internal or external), defibrillation controller 27 and shock source 29 .

[0023] As is known in the art, the electrode pads / plates 21 are structurally configured to be conductively applied to figure 1 The patient 10 in the anterior apex arrangement shown in , or in an anterior-posterior arrangement (not shown). Electrode pads / pads 21 conduct defibrillation shocks from shock source 29 to heart 11 of patient 10 and conduct ECG signals (not shown) representing the electrical activity of heart 11 of patient 10 to ECG monitor 23 . Alternatively or concurrently, ECG lead 22 is connected to patient 10 to conduct the ECG signal to ECG monito...

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PUM

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Abstract

An electrocardiogram high pass filter (25) employs a baseline low pass filter (40), a signal delay (44) and a signal extractor (45). In operation, baseline low pass filter (40) includes a finite impulse response filter (41) and an infinite impulse response low pass filter (42) cooperatively low pass filtering a baseline unfiltered electrocardiogram signal (ECGbu) to output a filtered baseline signal (BSEf). Baseline low pass filter (40) further includes a baseline wander estimator (43) dynamically adjusting a corner frequency of baseline low pass filter (40) as a function of an estimation of any baseline wander within the baseline unfiltered electrocardiogram signal (ECGbu). Signal delay (44) time delays the baseline unfiltered electrocardiogram signal (ECGbu) to output a delayed baseline unfiltered electrocardiogram signal (ECGdbu), and signal extractor (45) extracts the filtered baseline signal (BSEf) from the delayed baseline unfiltered electrocardiogram signal (ECGdbu) to output a baseline filtered electrocardiogram signal (ECGbf).

Description

technical field [0001] The present invention generally relates to high-pass filtering of electrocardiogram ("ECG") signals. In particular, the present invention relates to variable bandwidth high-pass filtering of ECG signals for diagnostic and emergency medical services ("EMC") purposes. Background technique [0002] As is known in the art, the signal amplitude of an ECG signal is typically about 1 mV, but may have a DC offset ranging from approximately -300 mV to +300 mV. This DC offset can drift with time and / or patient motion, and is often referred to as "baseline drift." Additionally, events such as defibrillation can have a significant impact on baseline. In particular, the DC offset following a defibrillation event is typically due to drift in the current that may flow through the ECG electrodes during the defibrillation event. [0003] Typical ECG signal display settings for gain have a range of + / -2mV in order to visually clearly see a 1mV ECG signal. In respons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N1/39A61B5/0428H03H17/04A61B5/00H04L25/03H03H17/02A61B5/308A61B5/366
CPCA61B5/725A61N1/3925A61B5/316A61B5/30A61N1/3987
Inventor E·C·赫尔雷克森
Owner KONINKLJIJKE PHILIPS NV