# US 11,305,080 B2 · Respiratory assistance device and respiratory assistance method

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- Number: US 11,305,080 B2
- Document ID: US11305080B2
- Status: Granted
- Kind: B2
- Application number: 16/336,310
- Filed: 2017-09-21
- Published: 2020-01-16
- Granted: 2022-04-19
- Earliest claimed: 2016-09-26
- Assignees: Metran Co., Ltd.
- Applicants: Metran Co., Ltd.
- Inventors: Kazufuku Nitta
- Web page: https://patentgrep.com/patent/US11305080B2

## CPC

- A61M 16/026: {specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis}
- A61M 16/16: Devices to humidify the respiration air {(A61M16/1045 takes precedence)}
- A61M 16/024: {including calculation means, e.g. using a processor}
- A61M 16/10: Preparation of respiratory gases or vapours
- A61M 16/1095: {in the connecting tubes}
- A61M 16/145: {using hollow fibres}
- A61M 16/161: {with means for measuring the humidity}
- A61M 16/0069: {the speed thereof being controlled by respiratory parameters, e.g. by inhalation}
- A61M 16/06: Respiratory or anaesthetic masks
- A61M 16/0666: {Nasal cannulas or tubing (devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02)}
- A61M 16/109: {the humidifying liquid or the beneficial agent}
- A61M 16/204: {used for inhalation control}
- A61M 2016/0039: {in the inspiratory circuit}
- A61M 2205/18: with alarm
- A61M 2205/3368: Temperature
- A61M 2205/3606: cooled
- A61M 2205/3653: by Joule effect, i.e. electric resistance
- A61M 2205/368: by electromagnetic radiation, e.g. IR waves
- A61M 2205/50: with microprocessors or computers
- A61M 2230/10: Electroencephalographic signals
- A61M 2230/18: Rapid eye-movements [REM]
- A61M 2230/50: Temperature
- A61M 2230/63: Motion, e.g. physical activity
- 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

A respiratory assistance device including a respiratory interface device configured to be worn by a user and deliver a gas, a gas temperature measurement unit configured to measure a gas temperature that is a temperature of the gas, a warming unit configured to warm the gas, and a temperature change unit configured to change the gas temperature by controlling the warming unit. The respiratory assistance device can administer comfortable respiratory assistance even during sleep.

## Claims

### Claim 1

A respiratory assistance device comprising:
a respiratory interface device configured to be worn by a user and deliver a gas;
a gas temperature measurement unit configured to measure a gas temperature that is a temperature of the gas;
a warming unit configured to warm the gas;
a temperature change unit configured to change the gas temperature by controlling the warming unit; and
an outside air temperature measurement unit configured to measure an outside air temperature that is a temperature of a place where the user is, wherein the temperature change unit controls the gas temperature on a basis of the outside air temperature;
wherein the outside air temperature is defined as Tout (in units of degrees Celsius), and the temperature change unit controls the gas temperature between (Tout-1) and (Tout-3).

### Claim 2 (depends on 1)

The respiratory assistance device according to claim 1, further comprising a humidifying device configured to humidify the gas.

### Claim 3 (depends on 2)

The respiratory assistance device according to claim 2, wherein
the humidifying device includes:
a water storage unit configured to store water intended for humidification; and
a porous hollow fiber unit to which the water in the water storage unit is supplied.

### Claim 4 (depends on 2)

The respiratory assistance device according to claim 2, comprising:
a gas humidity measurement unit configured to measure a gas humidity that is a humidity of the gas; and
a humidity change unit configured to control the humidifying device to change the gas humidity to a predetermined humidity.

### Claim 5 (depends on 4)

The respiratory assistance device according to claim 4, wherein the humidity change unit controls the humidifying device to supply a predetermined amount of water vapor on a basis of a correlation between the gas humidity and the gas temperature.

### Claim 6 (depends on 4)

The respiratory assistance device according to claim 4, comprising a living body information acquisition unit configured to obtain living body information about the user, wherein
the humidity change unit controls the humidifying device to change the gas humidity on a basis of the living body information.

### Claim 7 (depends on 1)

The respiratory assistance device according to claim 1, comprising a living body information acquisition unit configured to obtain living body information about the user, wherein
the temperature change unit controls the warming unit to change the gas temperature on a basis of the living body information.

### Claim 8 (depends on 7)

The respiratory assistance device according to claim 7, wherein the living body information acquisition unit includes a core temperature measurement unit configured to measure a core temperature that is a temperature of a deep part of the user's living body.

### Claim 9 (depends on 8)

The respiratory assistance device according to claim 8, wherein the temperature change unit controls the warming unit to decrease the gas temperature when the core temperature measured by the core temperature measurement unit decreases.

### Claim 10 (depends on 8)

The respiratory assistance device according to claim 8, wherein the temperature change unit controls the gas temperature to or below the core temperature.

### Claim 11 (depends on 7)

The respiratory assistance device according to claim 7, wherein the living body information acquisition unit includes a body surface temperature measurement unit configured to measure a body surface temperature that is a temperature of a body surface of the user.

### Claim 12 (depends on 11)

The respiratory assistance device according to claim 11, wherein the temperature change unit controls the warming unit to decrease the gas temperature when the body surface temperature measured by the body surface temperature measurement unit increases.

### Claim 13 (depends on 7)

The respiratory assistance device according to claim 7, wherein the living body information acquisition unit includes a body movement measurement unit configured to measure body movement of the user.

### Claim 14 (depends on 13)

The respiratory assistance device according to claim 13, comprising a sleep depth determination unit configured to determine depth of sleep of the user from the body movement measured by the body movement measurement unit, wherein
the gas temperature is lowered when the depth of sleep increases.

### Claim 15 (depends on 7)

The respiratory assistance device according to claim 7, further comprising a sleep level determination unit configured to determine a sleep level indicating a level of sleep of the user on a basis of the living body information obtained by the living body information acquisition unit, wherein
the temperature change unit controls the warming unit to change the gas temperature on a basis of the sleep level.