# US 10,499,824 B2 · Reducing electrocardiogram artifacts during and post CPR

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- Number: US 10,499,824 B2
- Document ID: US10499824B2
- Status: Granted
- Kind: B2
- Application number: 15/396,037
- Filed: 2016-12-30
- Published: 2017-06-22
- Granted: 2019-12-10
- Earliest claimed: 2012-03-27
- Assignees: Physio-Control, Inc.
- Applicants: Physio-Control, Inc.
- Inventors: Joseph L. Sullivan
- Web page: https://patentgrep.com/patent/US10499824B2

## CPC

- A61B 5/7217: {of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker}
- A61B 5/053: Measuring electrical impedance or conductance of a portion of the body
- A61B 5/346: Analysis of electrocardiograms
- A61B 5/361: Detecting fibrillation
- A61H 31/005: {with feedback for the user}
- A61H 31/006: {Power driven}
- A61H 31/007: {Manual driven}
- A61N 1/3925: {Monitoring; Protecting}
- A61H 2201/0103: inflatable
- A61H 2201/5007: computer controlled
- A61H 2201/5043: Displays
- A61H 2201/5071: Pressure sensors
- A61H 2201/5097: wireless
- A61H 2230/04: Heartbeat characteristics, e.g. E.G.C., blood pressure modulation
- A61H 2230/045: used as a control parameter for the apparatus
- A61H 2230/206: used as a control parameter for the apparatus
- A61H 2230/208: used as a control parameter for the apparatus
- A61H 2230/305: used as a control parameter for the apparatus (A61H2230/045 takes precedence)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61H: PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY (electrotherapy, magnetotherapy, radiation therapy or ultrasound therapy A61N)
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)

## Abstract

A portable medical device having improved ECG trace display and reporting. Embodiments implement features to ameliorate artifacts created by virtue of attempting to eliminate compression artifacts due to mechanical compression devices. Other embodiments additionally implement features to seek to detect the occurrence of ROSC while chest compressions are ongoing.

## Claims

### Claim 1

A method for processing an ECG signal, comprising:
receiving the ECG signal, the ECG signal including ECG data that is representative of one or more QRS complexes of a patient;
receiving an impedance signal, the impedance signal including impedance data representative of an impedance between at least two electrodes on the patient;
applying a first filter to the ECG signal to remove compression artifacts that result from mechanical chest compressions delivered to the patent at a periodic rate;
applying a second filter to the impedance signal to remove compression artifacts that result from the mechanical chest compressions delivered to the patient at the periodic rate;
correlating at least a portion of the impedance data with the ECG data;
assessing the correlated ECG and impedance data to determine that the patient has return of spontaneous circulation based on a temporal alignment of a QRS complex with at least a feature of the impedance data indicative of circulation; and
generating an instruction to stop mechanical chest compressions based on the determination that the patient has return of spontaneous circulation.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first filter is a comb filter.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first filter is a non-adaptive filter.

### Claim 4 (depends on 1)

The method of claim 1, wherein the second filter is a comb filter.

### Claim 5 (depends on 1)

The method of claim 1, wherein receiving the impedance signal includes applying a known signal to the at least two electrodes and measuring a corresponding voltage.

### Claim 6 (depends on 1)

The method of claim 1, wherein the impedance signal is received from a circuit separate from an external defibrillator containing the filter mechanism.

### Claim 7 (depends on 1)

The method of claim 1, wherein the second filter is a non-adaptive filter.

### Claim 8 (depends on 1)

The method of claim 1, wherein the first filter and the second filter are the same filter.

### Claim 9 (depends on 1)

The method of claim 1, further including transmitting the instruction to a mechanical chest compression device that is providing the mechanical chest compressions.