# US 11,298,491 B1 · System, device, and arrangement for a manual ventilation assistant

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- Number: US 11,298,491 B1
- Document ID: US11298491B1
- Status: Granted
- Kind: B1
- Application number: 16/949,551
- Filed: 2020-11-03
- Granted: 2022-04-12
- Earliest claimed: 2020-11-03
- Assignees: Accenture Global Solutions Limited
- Applicants: Accenture Global Solutions Limited
- Inventors: Narendra Anand; Sarah Crabb; Arnob Bhuyan
- Web page: https://patentgrep.com/patent/US11298491B1

## CPC

- A61M 16/024: {including calculation means, e.g. using a processor}
- A61M 16/06: Respiratory or anaesthetic masks
- A61M 16/0003: {Accessories therefor, e.g. sensors, vibrators, negative pressure}
- A61M 16/0084: {self-reinflatable by elasticity, e.g. resuscitation squeeze bags}
- A61M 16/106: {in a path}
- A61M 16/20: Valves specially adapted to medical respiratory devices
- A61M 16/1055: {bacterial}
- A61M 16/1065: {in the expiratory path}
- A61M 16/107: {in the inspiratory path}
- A61M 16/208: {Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves}
- A61M 2016/0027: {pressure meter}
- A61M 2016/003: {with a flowmeter}
- A61M 2016/0036: {in the breathing tube and used in both inspiratory and expiratory phase}
- A61M 2205/3334: Measuring or controlling the flow rate
- A61M 2205/3592: using telemetric means, e.g. radio or optical transmission
- A61M 2205/50: with microprocessors or computers
- A61M 2205/502: User interfaces, e.g. screens or keyboards
- A61M 2205/581: by audible feedback
- A61M 2205/583: by visual feedback
- A61M 2205/75: with filters
- A61M 2205/7545: for solid matter, e.g. microaggregates
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

In some implementations, a system may receive, from a differential pressure sensor, a differential pressure measurement associated with a differential pressure across an air filter within an airway of a manual ventilator. The system may determine, based on the differential pressure measurement, an air flow rate through the airway. The system may determine timing of a compression cycle of the manual ventilator. The system may determine, based on the timing, a flow threshold associated with a desired breathing cycle. The system may determine a difference between the flow threshold and the air flow rate. The system may provide, via a display associated with the manual ventilator, a representation associated with the difference to indicate whether a compression parameter of the compression cycle is to be adjusted.

## Claims

### Claim 1

A method, comprising:
determining, by a differential pressure sensor of a device capable of being fit within a manual ventilator and via a first sensor line and a second sensor line, a differential pressure measurement associated with a differential pressure across an air filter, of a coupling of the device, positioned within a ventilator airway of the manual ventilator;
receiving, by the device and from an absolute pressure sensor, of the device, via a third sensor line, an absolute pressure measurement associated with an absolute pressure of a patient airway near or toward a patient-side opening;
determining, by the device and based on the differential pressure measurement and the absolute pressure measurement, an air flow rate through the ventilator airway;
determining, by the device, a timing of a compression cycle of the manual ventilator;
determining, by the device, a desired breathing cycle based on one or more characteristics of the device;
determining, by the device and based on the timing, a flow threshold associated with the desired breathing cycle;
determining, by the device, a difference between the flow threshold and the air flow rate; and
providing, by the device and via a display associated with the manual ventilator, a representation associated with the difference to indicate whether a compression parameter of the compression cycle is to be adjusted.

### Claim 2 (depends on 1)

The method of claim 1, wherein a first sensor input of the differential pressure sensor is fluidly coupled to the ventilator airway toward a manual ventilator-side of the air filter and a second sensor input of the differential pressure sensor is fluidly coupled to the ventilator airway toward a patient-side of the air filter.

### Claim 3 (depends on 2)

The method of claim 2, wherein the air filter is a first air filter, and
wherein the second sensor input is fluidly coupled to the ventilator airway between the first air filter and a second air filter within the ventilator airway,
wherein the second air filter is in the ventilator airway toward the patient-side of the second sensor input.

### Claim 4 (depends on 2)

The method of claim 2, wherein the air filter is positioned within the ventilator airway via the coupling, and wherein the coupling is fluidly coupled between the manual ventilator and the patient-side opening.

### Claim 5 (depends on 4)

The method of claim 4, wherein at least one of:
a cross-sectional area of the coupling is greater than a cross-sectional area of a flow line between the coupling and the patient-side opening; or
a cross-sectional area of the air filter is greater than a cross-sectional area of the flow line of the ventilator airway.

### Claim 6 (depends on 1)

The method of claim 1, wherein the air filter is configured to prevent at least 95% of airborne particles within the ventilator airway from entering at least one of the first sensor line or the second sensor line.

### Claim 7 (depends on 1)

The method of claim 1, wherein the manual ventilator is associated with a bag-valve-mask apparatus.

### Claim 8 (depends on 1)

The method of claim 1, wherein the representation indicates at least one of:
whether a compression rate of the compression cycle is to be increased or decreased;
whether a compression rate of a subsequent compression cycle is to be increased or decreased; or
whether a time period between the compression cycle and a subsequent compression cycle is to be longer or shorter than a time period between the compression cycle and a previous compression cycle.

### Claim 9 (depends on 1)

The method of claim 1, wherein the first sensor line and the second sensor line provide a first pressure measurement and a second pressure measurement, respectively,
wherein the differential pressure measurement is based on the first pressure measurement and the second pressure measurement, and
wherein the differential pressure measurement includes a polarity based on whether the first pressure measurement is greater than the second pressure measurement.

### Claim 10

A device, comprising:
an air filter, of a coupling of the device, configured to be positioned within an airway of a manual ventilator;
a differential pressure sensor configured to provide a differential pressure measurement associated with a differential pressure across the air filter via a first sensor line and a second sensor line; and
an absolute pressure sensor configured to measure an absolute pressure of a patient airway near or toward a patient-side opening via a third sensor line; and
a monitor configured to:
receive information indicating a differential pressure measurement and an absolute pressure measurement from the differential pressure sensor and the absolute pressure sensor, respectively;
determine, based on the information indicating the differential pressure measurement and the absolute pressure measurement, an air flow rate through the airway;
determine, based on the air flow rate and a flow threshold, whether a compression parameter of the manual ventilator requires adjustment,
wherein the monitor, when determining whether the compression parameter requires adjustment, is configured to:
determine a desired breathing cycle based on one or more characteristics of the device,
determine a timing of a patient breathing cycle facilitated by the manual ventilator, and
determine the flow threshold based on the timing and the desired breathing cycle; and
provide, via a display associated with the manual ventilator, an indication associated with whether the compression parameter requires adjustment.

### Claim 11 (depends on 10)

The device of claim 10, wherein the air filter is positioned within the coupling,
wherein the coupling is located between the manual ventilator and the patient-side opening, and
wherein a cross-sectional area of the coupling is greater than a cross-sectional area of a flow line of the airway.

### Claim 12 (depends on 11)

The device of claim 11, wherein the monitor is further configured to:
prior to determining the air flow rate, receive an input that identifies the cross-sectional area of the airway,
wherein the air flow rate is determined based on the cross-sectional area of the airway.

### Claim 13 (depends on 10)

The device of claim 10, wherein the monitor, when determining whether the compression parameter requires adjustment, is configured to:
compare the air flow rate with the flow threshold,
wherein the compression parameter requires adjustment based on whether a difference between the flow threshold and the air flow rate satisfies a difference threshold.

### Claim 14 (depends on 10)

The device of claim 10, wherein the flow threshold is based on a timing of the desired breathing cycle that is to be facilitated by the manual ventilator.

### Claim 15 (depends on 10)

The device of claim 10, wherein the manual ventilator is associated with a bag-valve-mask apparatus.

### Claim 16 (depends on 10)

The device of claim 10, wherein the air filter is configured to filter at least 95% of airborne particles within the airway.

### Claim 17

A manual ventilation system comprising:
a manual ventilator including a ventilator airway and a patient-side opening,
wherein the patient-side opening is configured to fluidly couple the ventilator airway with a patient airway;
a manual ventilator assistant, separate from the manual ventilator and configured to assist a user in using the manual ventilator, including a coupling, a differential pressure sensor, an absolute pressure sensor, a first sensor line, a second sensor line, and a third sensor line,
wherein the coupling includes an air filter and is configured to be fluidly coupled to the manual ventilator,
wherein the differential pressure sensor is configured to measure a differential pressure across the air filter via the first sensor line and the second sensor line, and
wherein the absolute pressure sensor is configured to measure an absolute pressure of the patient airway near or toward the patient-side opening via the third sensor line;
a ventilation monitor configured to:
receive information indicating a differential pressure measurement and an absolute pressure measurement from the differential pressure sensor and the absolute pressure sensor, respectively;
determine, based on the information indicating the differential pressure measurement and the absolute pressure measurement, an air flow rate through the ventilator airway,
determine a desired breathing cycle based on one or more characteristics of the manual ventilation system; and
provide, via a display associated with the manual ventilator, an indication associated with the air flow rate and based on the desired breathing cycle.

### Claim 18 (depends on 17)

The manual ventilation system of claim 17, wherein the air filter is a first air filter and the coupling includes a second air filter,
wherein the first sensor line of the differential pressure sensor is fluidly coupled to the ventilator airway between the manual ventilator and the first air filter;
wherein the second sensor line of the differential pressure sensor is fluidly coupled to the ventilator airway between the first air filter and the second air filter; and
wherein the second air filter is positioned within the ventilator airway between the first air filter and the patient-side opening.

### Claim 19 (depends on 17)

The manual ventilation system of claim 17, wherein the ventilation monitor is further configured to:
prior to providing the indication, determine based on the air flow rate whether a compression parameter associated with a compression cycle of the manual ventilator requires adjustment; and
generate the indication based on whether the compression parameter requires adjustment.

### Claim 20 (depends on 17)

The manual ventilation system of claim 17, wherein the indication is configured to assist a user that is manually compressing the manual ventilator to facilitate breathing for a patient based on identifying at least one of:
a compression rate of a compression cycle of the manual ventilator;
whether the compression rate of the compression cycle is to be increased or decreased;
whether a compression rate of a subsequent compression cycle is to be increased or decreased; or
whether a time period between the compression cycle and a subsequent compression cycle is to be longer or shorter than a time period between the compression cycle and a previous compression cycle.