# US 2016/0256102 A1 · Identification of respiration waveforms during cpr

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- Number: US 2016/0256102 A1
- Document ID: US20160256102A1
- Status: Published application
- Kind: A1
- Application number: 14/639,184
- Filed: 2015-03-05
- Published: 2016-09-08
- Earliest claimed: 2015-03-05
- Assignees: Oridion Medical 1987 Ltd.
- Applicants: Oridion Medical 1987 Ltd.
- Inventors: Jacob Castiel; Keren Davidpur; Michal RONEN
- Web page: https://patentgrep.com/patent/US20160256102A1

## CPC

- A61B 5/4836: {Diagnosis combined with treatment in closed-loop systems or methods (A61B5/0036 takes precedence)}
- A61B 5/0816: {Measuring devices for examining respiratory frequency (measuring frequency of electric signals G01R23/00)}
- A61B 5/0836: {Measuring rate of CO2 production}
- A61B 5/725: {using specific filters therefor, e.g. Kalman or adaptive filters (specific diagnostics methods using using bioelectric or biomagnetic signals A61B5/316)}
- A61B 5/7264: {Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems}
- A61B 5/7278: {Artificial waveform generation or derivation, e.g. synthesizing signals from measured signals}
- A61B 5/7425: {Displaying combinations of multiple images regardless of image source, e.g. displaying a reference anatomical image with a live image}
- A61N 1/39044: {in combination with cardiopulmonary resuscitation [CPR] therapy}
- A61B 5/087: Measuring breath flow
- A61B 5/7207: {of noise induced by motion artifacts}
- A61B 5/7405: {using sound}
- A61B 2505/01: Emergency care
- A61B 2562/0247: Pressure sensors
- A61H 31/007: {Manual driven}
- A61H 2201/0184: by raising an alarm
- A61H 2201/10: with further special therapeutic means, e.g. electrotherapy, magneto therapy or radiation therapy, chromo therapy, infrared or ultraviolet therapy
- A61H 2201/1207: with electric or magnetic drive
- A61H 2201/1619: Thorax
- A61H 2201/5007: computer controlled
- A61H 2201/5043: Displays
- A61H 2201/5089: Gas sensors, e.g. for oxygen or CO2
- A61H 2230/08: Other bio-electrical signals
- A61H 2230/085: used as a control parameter for the apparatus
- A61H 2230/42: Rate
- A61H 2230/425: used as a control parameter for the apparatus
- A61N 1/3993: {User interfaces for automatic external defibrillators}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- 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)
- 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)

## Abstract

Device and method for identifying respiration waveforms during cardiopulmonary resuscitation (CPR), the method including obtaining CO2 measurements from a subject undergoing CPR, processing the CO2 measurements by applying a waveform detection algorithm thereto, wherein the waveform detection algorithm is configured to identify respiration waveforms and filtering out compression derived waveform-like signals; and identifying a respiration rate of the subject based on the identified respiration waveforms.

## Claims

### Claim 1

A method for identifying respiration waveforms during cardiopulmonary resuscitation (CPR) in a subject suffering from cardiac arrest, the method comprising:
obtaining a plurality of CO2 measurements from the subject undergoing CPR, said measurements comprising compression derived waveform-like signals;
processing the plurality of CO2 measurements by applying a waveform detection algorithm thereto, wherein the waveform detection algorithm is configured to identify respiration waveforms and filtering out compression derived waveform-like signals; and
identifying a respiration rate of the subject based on the identified respiration waveforms.

### Claim 2 (depends on 1)

The method of claim 1, wherein the waveform detection algorithm is configured to identify respiration waveforms based on an identification of at least one waveform parameter.

### Claim 3 (depends on 2)

The method of claim 2, wherein the at least one waveform parameter comprise a shape and/or a scale factor.

### Claim 4 (depends on 1)

The method of claim 1, wherein applying the waveform detection algorithm comprises applying differentials and/or heuristic rules to the plurality of CO2 measurements.

### Claim 5 (depends on 1)

The method of claim 1, further comprising obtaining a plurality of flow sensor signals and/or pressure sensor signals.

### Claim 6 (depends on 5)

The method of claim 5, wherein identifying respiration waveforms in the plurality of CO2 measurements further comprises processing the plurality of flow sensor signals and/or pressure sensor signals.

### Claim 7 (depends on 1)

The method of claim 1, further comprising obtaining a background characteristic of the subject.

### Claim 8 (depends on 7)

The method of claim 7, wherein identifying respiration waveforms in the plurality of CO2 measurements is further based on the obtained background characteristic.

### Claim 9 (depends on 1)

The method of claim 1, further comprising obtaining a signal indicative of a compression.

### Claim 10 (depends on 9)

The method of claim 9, wherein identifying respiration waveforms in the plurality of CO2 measurements is further based on the signal indicative of a compression.

### Claim 11 (depends on 1)

The method of claim 1, further comprising displaying the plurality of CO2 measurements and/or the identified respiration waveforms.

### Claim 12 (depends on 1)

The method of claim 1, further comprising identifying a respiration pattern responsive to CPR based on an analysis of plurality of CO2 measurements, the identified respiration waveforms and/or the compression derived waveform-like signals.

### Claim 13 (depends on 12)

The method of claim 12, further comprising adjusting at least one CPR parameter based on said identified respiration pattern.

### Claim 14 (depends on 13)

The method of claim 13, wherein the at least one CPR parameter is selected from frequency of chest compressions, depth of chest compressions, provision of breath, frequency of breath provision, target of breath provision, airway management or any combinations thereof.

### Claim 15 (depends on 13)

The method of claim 13, wherein the adjustment of the at least one CPR parameter is automatic.

### Claim 16

A processor configured to identify respiration waveforms during CPR, the processor comprising a control logic configured to:
obtain a plurality of CO2 measurements from a subject undergoing CPR, said measurements comprising compression derived waveform-like signals; and
process the plurality of CO2 measurements by applying a waveform detection algorithm thereto, wherein said waveform detection algorithm is configured to identify respiration waveforms and filtering out compression derived waveform-like signals; and
identify a respiration rate of the subject based on the identified respiration waveforms.

### Claim 17 (depends on 16)

The processor of claim 16, further comprising a display configured to display the plurality of CO2 measurements and/or the identified respiration waveforms.

### Claim 18

A medical device comprising a processor configured to:
obtain a plurality of CO2 measurements from a subject undergoing CPR, said measurements comprising compression derived waveform-like signals; and
process the plurality of CO2 measurements by applying a waveform detection algorithm thereto, wherein said waveform detection algorithm is configured to identify respiration waveforms and filtering out compression derived waveform-like signals; and
identify a respiration rate of the subject based on the identified respiration waveforms.

### Claim 19 (depends on 18)

The medical device of claim 18 being an automated external defibrillator.