# US 12,594,220 B2 · Method and apparatus for monitoring manual chest compression efficiently during CPR

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- Number: US 12,594,220 B2
- Document ID: US12594220B2
- Status: Granted
- Kind: B2
- Application number: 17/304,655
- Filed: 2021-06-24
- Published: 2022-01-13
- Granted: 2026-04-07
- Earliest claimed: 2011-07-27
- Assignees: ZOLL Medical Corporation
- Applicants: ZOLL Medical Corporation
- Inventors: Leszek Bogdanowicz; Brian J Skelton; Michael C Garrett
- Web page: https://patentgrep.com/patent/US12594220B2

## CPC

- A61H 31/007: {Manual driven}
- A61B 5/11: Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb {(A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721)}
- A61B 5/6843: {Monitoring or controlling sensor contact pressure}
- A61B 5/742: {using visual displays (displays for heart-related electrical signals, e.g. ECG, A61B5/339)}
- A61H 2201/1619: Thorax
- A61H 2201/5007: computer controlled
- A61H 2201/5043: Displays
- A61H 2201/5048: Audio interfaces, e.g. voice or music controlled
- A61H 2201/5061: Force sensors
- A61H 2201/5097: wireless
- A61N 1/3993: {User interfaces for automatic external defibrillators}
- 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)
- 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)

## Abstract

A compression measurement and feedback system which measures the magnitude and the angle of manual CPR force applied to a patient and provides the measured magnitude and direction information as compression data feedback to the person applying CPR to the patient. Any variation in the magnitude or direction of the compression force applied may be calculated from the compression data measured by the compression sensor. A monitor receives the compression data and processes the compression data to generate feedback data to the CPR provider indicating the magnitude and direction of the applied CPR compression along with ideal CPR compression characteristics for comparison.

## Claims

### Claim 1

A cardiopulmonary resuscitation (CPR) compression measurement and feedback system, comprising:
a compression sensor for measuring a magnitude and a direction of a CPR compression force, of a CPR compression, applied to a patient undergoing CPR and for providing, as compression data, the measured magnitude and the measured direction; and
a monitor for receiving and processing the compression data, the monitor configured to:
based on the compression data, calculate an extent of variation in the magnitude and an extent of variation in the direction of the applied CPR compression force from desired CPR compression characteristics, and
based on the extent of the variation in the magnitude and the extent of the variation in the direction, generate graphical feedback, for a CPR provider, to indicate the measured magnitude and the measured direction of the applied CPR compression force and to indicate the extent of the variation in the magnitude and the extent of the variation in the direction of the applied CPR compression force from the desired CPR compression characteristics, the graphical feedback comprising an expandable shape that expands as the CPR compression is applied and that moves to provide feedback on the direction of the CPR compression force, the graphical feedback comprising the feedback.

### Claim 2 (depends on 1)

The system of claim 1, wherein the desired CPR compression characteristics comprise a desired magnitude of the CPR compression force, and wherein the feedback indicates the extent of the variation in the magnitude of the applied CPR compression force relative to the desired magnitude of the CPR compression force.

### Claim 3 (depends on 1)

The system of claim 1, wherein the desired CPR compression characteristics comprise a desired direction of the CPR compression force, and wherein the feedback indicates the extent of the variation in the direction of the applied CPR compression force, relative to the desired direction of the CPR compression force, associated with each of two orthogonal horizontal axes, the two orthogonal horizontal axes being horizontal relative to the patient.

### Claim 4 (depends on 3)

The system of claim 3, wherein the desired direction of the CPR compression force is along an anterior-posterior axis of the patient, and wherein the variation in the direction of the applied CPR compression force is along each of the two orthogonal horizontal axes and relative to the anterior-posterior axis of the patient.

### Claim 5 (depends on 4)

The system of claim 4, wherein the two orthogonal horizontal axes comprise a lateral axis relative to the patient and a superior-inferior axis relative to the patient.

### Claim 6 (depends on 1)

The system of claim 1, wherein the compression sensor comprises at least one magnet.

### Claim 7 (depends on 6)

The system of claim 6, wherein the at least one magnet comprises at least one permanent magnet.

### Claim 8 (depends on 6)

The system of claim 6, wherein the compression sensor comprises an array of magnetic sensors.

### Claim 9 (depends on 8)

The system of claim 8, wherein the compression sensor comprises:
a printed circuit board comprising the array of magnetic sensors; and
a compression pad secured to the printed circuit board, the compression pad comprising the at least one magnet.

### Claim 10 (depends on 9)

The system of claim 9, wherein the compression pad is a polymer compression pad.

### Claim 11 (depends on 9)

The system of claim 9, wherein the at least one magnet is suspended above the array of magnetic sensors.

### Claim 12 (depends on 11)

The system of claim 11, wherein the at least one magnet is disposed within the compression pad.

### Claim 13 (depends on 12)

The system of claim 12, wherein the system is configured such that the CPR compression force applied to the compression pad causes movement of the at least one magnet relative to the array of magnetic sensors.

### Claim 14 (depends on 13)

The system of claim 13, wherein the system is configured such that the movement of the at least one magnet relative to the array of magnetic sensors is a function of the magnitude and the direction of the CPR compression force applied to the compression pad.

### Claim 15 (depends on 1)

The system of claim 1, wherein the desired CPR compression characteristics comprise a desired direction, and wherein the extent of the variation in the direction comprises an extent of variation relative to the desired direction.

### Claim 16 (depends on 15)

The system of claim 15, wherein the extent of the variation in the direction comprises an extent of variation along each of two axes.

### Claim 17 (depends on 1)

The system of claim 1, wherein the desired CPR compression characteristics comprise a desired CPR compression force, and wherein the extent of the variation in the magnitude comprises an extent of variation relative to the desired CPR compression force.