# US 11,076,769 B2 · Human body wearable device and operation method thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,076,769 B2
- Document ID: US11076769B2
- Status: Granted
- Kind: B2
- Application number: 15/566,299
- Filed: 2016-04-12
- Published: 2018-04-12
- Granted: 2021-08-03
- Earliest claimed: 2015-04-14
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: Sang Hun Lee
- Web page: https://patentgrep.com/patent/US11076769B2

## CPC

- A61B 5/02438: {with portable devices, e.g. worn by the patient}
- A61B 5/6844: {Monitoring or controlling distance between sensor and tissue}
- A61B 5/00: Measuring for diagnostic purposes (radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00); Identification of persons
- A61B 5/1455: using optical sensors, e.g. spectral photometrical oximeters
- A61B 5/14551: {for measuring blood gases}
- A61B 5/681: {Wristwatch-type devices}
- G06F 3/011: {Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00)}
- A61B 5/1118: {Determining activity level}
- A61B 5/6843: {Monitoring or controlling sensor contact pressure}
- A61B 5/7221: {Determining signal validity, reliability or quality (preventing, reducing or removing noise induced by motion artefacts A61B5/7207; noise originating from a therapeutic or surgical apparatus A61B5/7217)}
- A61B 2560/0242: adapted to measure environmental factors, e.g. temperature, pollution
- G06F 1/3231: Monitoring the presence, absence or movement of users
- H10F 55/25: wherein the radiation-sensitive devices and the electric light source are all semiconductor devices
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION

## Abstract

According to an embodiment of the present disclosure, there is provided a human body wearable device including: a light emitting unit for generating light to outside, a light receiving unit for receiving light incident from outside; and a control unit for controlling an operation of the light emitting unit and detecting an intensity of light incident on the light receiving unit depending on the operation of the light emitting unit, and detecting a wearing state of the human body wearable device based on an intensity of detected light, wherein the control unit detects the wearing state using a difference value between an intensity of the light incident on the light receiving unit in an ON section of the light emitting unit and that of the light incident on the light receiving unit in an OFF section of the light emitting unit.

## Claims

### Claim 1

A human body wearable device, comprising:
a first light emitting unit configured to generate first light;
a second light emitting unit configured to generate second light;
a first light receiving unit configured to receive light incident from outside depending on an operation of the first light emitting unit;
a second light receiving unit configured to receive light incident from outside depending on operations of the second light emitting unit; and
a control unit configured to detect a wearing state of the human body wearable device in response to the operation of the first light emitting unit and an operation of the first light receiving unit in a wearing state detection mode, and to detect a state of the human body according to the operations of the second light emitting unit and an operation of the second light receiving unit in a human body signal detection mode,
wherein the control unit is also configured to
determine whether the human body wearable device is worn based on a difference value between a first intensity of the light incident on the first light receiving unit in an ON section of the first light emitting unit and that of the light incident on the first light receiving unit in an OFF section of the first light emitting unit while being in the wearing state detection mode, determine that the human body wearable device is not worn if the difference value is zero, while being in the wearing state detection mode,
determine that the human body wearable device is worn on a specific object if the difference value is greater than zero, while being in the wearing state detection mode,
detect a raw signal waveform of a pulse wave based on the first intensity if the human body wearable device is worn on the specific object, while being in the wearing state detection mode,
generate a waveform of a secondary differential signal by secondarily differentiating the detected raw signal waveform of the pulse wave while being in the wearing state detection mode,
generate a peak signal waveform by detecting a peak signal from the generated second-order differential signal waveform while being in the wearing state detection mode,
determine that the human body wearable device is worn on the human body if a heart rate (HR) of the peak signals of the generated peak signal waveform is within a range of 30 to 240 bpm, while being in the wearing state detection mode,
determine that the human body wearable device is worn on a thing if the heart rate (HR) exceeds the range of 30 to 240 bpm, and
enter the human body signal detection mode if the human body wearable device is worn on the human body,
detect a state of the human body according to the operations of the second light emitting unit and the second light receiving unit while being in the human body signal detection mode, and
detect whether the human body wearable device previously worn is separated from the human body in response to the operations of the first light emitting unit and the first light receiving unit while being in the human body signal detection mode.

### Claim 2

A method of operating a human body wearable device, comprising:
entering a wearing state detection mode;
outputting a pulse signal including ON and OFF sections while being in the wearing state detection mode;
operating a first light emitter depending on the pulse signal while being in the wearing state detection mode;
determining whether the human body wearable device is worn based on a difference value between a first intensity of light incident on a first light receiving unit in an ON section of the first light emitting unit and that of light incident on the first light receiving unit in an OFF section of the first light emitting unit, while being in the wearing state detection mode,
determining that the human body wearable device is not worn if the difference value is zero, while being in the wearing state detection mode,
determining that the human body wearable device is worn on a specific object if the difference value is greater than zero, while being in the wearing state detection mode,
detecting a raw signal waveform of a pulse wave based on the first intensity if the human body wearable device is worn on a specific object, while being in the wearing state detection mode,
generating a waveform of a secondary differential signal by secondarily differentiating the detected raw signal waveform of the pulse wave while being in the wearing state detection mode,
generating a peak signal waveform by detecting a peak signal from the generated second-order differential signal waveform while being in the wearing state detection mode,
determining that the human body wearable device is worn on a human body if a heart rate (HR) of the peak signals of the generated peak signal waveform is within a range of 30 to 240 bpm, while being in the wearing state detection mode,
determining that the human body wearable device is worn on a thing if the heart rate (HR) exceeds the range of 30 to 240 bpm,
entering a human body signal detection mode if the human body wearable device is worn on the human body,
detecting a state of the human body according to operations of a second light emitting unit and a second light receiving unit while being in the human body signal detection mode, and
detecting whether the human body wearable device previously worn is separated from the human body in response to operations of the first light emitting unit and the first light receiving unit while being in the human body signal detection mode.