# US 2017/0281052 A1 · Method and apparatus for testing vital capacity

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- Number: US 2017/0281052 A1
- Document ID: US20170281052A1
- Status: Published application
- Kind: A1
- Application number: 15/507,612
- Filed: 2015-06-29
- Published: 2017-10-05
- Earliest claimed: 2014-12-12
- Assignees: Goertek Inc.
- Applicants: Goertek Inc.
- Inventors: Wenming Yan
- Web page: https://patentgrep.com/patent/US20170281052A1

## CPC

- A61B 5/091: Measuring volume of inspired or expired gases, e.g. to determine lung capacity
- A61B 5/085: Measuring impedance of respiratory organs or lung elasticity
- A61B 5/087: Measuring breath flow
- A61B 5/097: Devices for facilitating collection of breath or for directing breath into or through measuring devices
- A61B 5/113: occurring during breathing
- A61B 5/6898: {Portable consumer electronic devices, e.g. music players, telephones, tablet computers}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

The present disclosure discloses a method and apparatus for testing vital capacity. The method comprises: measuring a static pressure P0 of a pressure hole inner cavity of a mobile device; wherein the pressure hole is communicated with the exterior and is purposely disposed on the mobile device or is an already-designed opening; obtaining an air pressure P(t) at each moment by blowing air towards the pressure hole; obtaining an air flow speed v(t) corresponding to each moment according to a correspondence relation formula between the air flow speed v(t) and a pressure differential P(t)−P0; and obtaining vital capacity Vc of the subject according to a correspondence relationship between a measurement time t and the air flow speed v(t). The technical solution obtains the vital capacity of the subject according to the correspondence relationship between the air flow speed and the measurement time, can effectively improve the vital capacity measurement precision, does not cause damages to related components of the testing apparatus, and is completely different from the solution of using a microphone to measure the vital capacity in the prior art.

## Claims

### Claim 1

A method for testing vital capacity, wherein the method comprises:
measuring a static pressure P0 of a pressure hole inner cavity of a mobile device;
wherein the pressure hole is communicated with the exterior and is purposely disposed on the mobile device or is an already-designed opening;
obtaining an air pressure P(t) at each moment by blowing air towards the pressure hole;
obtaining an air flow speed v(t) corresponding to each moment according to a correspondence relation formula between the air flow speed v(t) and a pressure differential P(t)−P0; and
obtaining vital capacity Vc of the subject according to a correspondence relationship between a measurement time t and the air flow speed v(t).

### Claim 2 (depends on 1)

The method for testing vital capacity according to claim 1, wherein, the obtaining an air flow speed v(t) corresponding to each moment according to a correspondence relation formula between the air flow speed v(t) and a pressure differential P(t)−P0 comprises:
obtaining the air flow speed v(t) at the current moment according to a formula
v

(
t
)
=
2

(
P

(
t
)
-
P
0
)
ρ
,
wherein ρ is air density.

### Claim 3 (depends on 1)

The method for testing vital capacity according to claim 1, wherein, the obtaining vital capacity Vc of the subject according to a correspondence relationship between a measurement time t and the air flow speed v(t) comprises:
obtaining the vital capacity Vc of the subject according to a formula
Vc
=
s

∫
0
t

tgv

(
t
)

dt
,
wherein s is a cross section of the pressure hole inner cavity.

### Claim 4 (depends on 1)

The method for testing vital capacity according to claim 1, wherein the obtaining the vital capacity Vc of the subject according to a correspondence relationship between a measurement time t and the air flow speed v(t) comprises:
obtaining the vital capacity Vc of the subject according to a formula
Vc
=
tgs

2

(
P
max
-
P
0
)
ρ
,
wherein ρ is air density, Pmax is a maximum air pressure value obtained within the measurement time t, and s is a cross section of the pressure hole inner cavity.

### Claim 5 (depends on 1)

The method for testing vital capacity according to claim 1, wherein, the mobile device comprises a mobile phone or a wearable device.

### Claim 6

A testing apparatus for vital capacity, wherein the apparatus comprises:
a pressure sensor disposed in a pressure hole inner cavity of the testing apparatus, wherein the pressure hole is communicated with the exterior and is purposely disposed on the testing apparatus or is an already-designed opening, and configured to obtain an air pressure P(t) at each moment by blowing air towards the pressure hole; and
a vital capacity obtaining unit configured to obtain an air flow speed v(t) corresponding to each moment according to a correspondence relation formula between the air flow speed v(t) and a pressure differential P(t)−P0, and obtain vital capacity Vc of the subject according to a correspondence relationship between a measurement time t and the air flow speed v(t), wherein P0 is a static pressure of the pressure hole inner cavity of the testing apparatus.

### Claim 7 (depends on 6)

The testing apparatus for vital capacity according to claim 6, wherein the vital capacity obtaining unit comprises:
an air flow speed obtaining module configured to obtain the air flow speed v(t) at the current moment according to a formula
v

(
t
)
=
2

(
P

(
t
)
-
P
0
)
ρ
,
wherein ρ is air density.

### Claim 8 (depends on 6)

The testing apparatus for vital capacity according to claim 6, wherein the vital capacity obtaining unit is specifically used to,
obtain the vital capacity Vc of the subject according to a formula
Vc
=
s

∫
0
t

tgv

(
t
)

dt
,
wherein s is a cross section of the pressure hole inner cavity.

### Claim 9 (depends on 6)

The testing apparatus for vital capacity according to claim 6, wherein the vital capacity obtaining unit is specifically used to,
obtain the vital capacity Vc of the subject according to a formula
Vc
=
tgs

2

(
P
max
-
P
0
)
ρ
,
wherein ρ is air density, Pmax is a maximum air pressure value obtained within the measurement time t, and s is a cross section of the pressure hole inner cavity.

### Claim 10 (depends on 6)

The testing apparatus for vital capacity according to claim 6, wherein the testing apparatus for vital capacity is disposed in a mobile device, and the mobile device comprises a mobile phone or a wearable device.