U.S. patent application number 16/755037 was filed with the patent office on 2021-08-19 for oximeter.
The applicant listed for this patent is CONTEC MEDICAL SYSTEMS CO., LTD.. Invention is credited to Kun HU, Zhichao SONG, Di WU, Yunlong XU, Bohua YAN, Jinling ZHANG, Yatao ZHAO.
Application Number | 20210251537 16/755037 |
Document ID | / |
Family ID | 1000005750113 |
Filed Date | 2021-08-19 |
United States Patent
Application |
20210251537 |
Kind Code |
A9 |
HU; Kun ; et al. |
August 19, 2021 |
OXIMETER
Abstract
Embodiments of the disclosure provide an oximeter, including a
blood oxygen collecting unit that has a first light emitting unit,
a second light emitting unit, and a light receiving sensor, the
first light emitting unit emitting a red light, the second light
emitting unit emitting an infrared light, and the light receiving
sensor receiving the red light emitted by the first light emitting
unit and the infrared light emitted by the second light emitting
unit and not absorbed by the human body, and converting them into
an electrical signal, a storage unit that stores a first threshold
value, a microprocessor that calculates a blood oxygen saturation
of the human body based on the electrical signal detected by the
light receiving sensor, and includes a judging unit that judges
whether the blood oxygen saturation is lower than the first
threshold value, and a display unit.
Inventors: |
HU; Kun; (Qinhuangdao,
CN) ; XU; Yunlong; (Qinhuangdao, CN) ; ZHANG;
Jinling; (Qinhuangdao, CN) ; ZHAO; Yatao;
(Qinhuangdao, CN) ; SONG; Zhichao; (Qinhuangdao,
CN) ; WU; Di; (Qinhuangdao, CN) ; YAN;
Bohua; (Qinhuangdao, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CONTEC MEDICAL SYSTEMS CO., LTD. |
Qinhuangdao |
|
CN |
|
|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20200261004 A1 |
August 20, 2020 |
|
|
Family ID: |
1000005750113 |
Appl. No.: |
16/755037 |
Filed: |
August 15, 2019 |
PCT Filed: |
August 15, 2019 |
PCT NO: |
PCT/CN2019/100795 PCKC 00 |
371 Date: |
April 9, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61B 5/6838 20130101;
A61B 5/6824 20130101; A61B 5/14552 20130101; A61B 5/6826 20130101;
A61B 5/7235 20130101; A61B 5/742 20130101; A61B 5/746 20130101 |
International
Class: |
A61B 5/1455 20060101
A61B005/1455; A61B 5/00 20060101 A61B005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 16, 2018 |
CN |
201810932722.9 |
Claims
1. An oximeter comprising: a blood oxygen collecting unit that has
a first light emitting unit, a second light emitting unit, and a
light receiving sensor, the first light emitting unit emitting a
red light, the second light emitting unit emitting an infrared
light, and the light receiving sensor i) receiving the red light
emitted by the first light emitting unit and not absorbed by a
human body and the infrared light emitted by the second light
emitting unit and not absorbed by the human body, and ii)
converting them into an electrical signal; a storage unit that
stores a first threshold value; a microprocessor that calculates a
blood oxygen saturation of the human body based on the electrical
signal detected by the light receiving sensor, and comprises a
judging unit that judges whether the blood oxygen saturation is
lower than the first threshold value; and a display unit that, in a
case where the judging unit judges that the blood oxygen saturation
is lower than the first threshold value, flickeringly displays the
blood oxygen saturation at a first frequency.
2. The oximeter according to claim 1, wherein the storage unit
further stores a second threshold value smaller than the first
threshold value, wherein the judging unit, in a case where it is
judged that the blood oxygen saturation is lower than the first
threshold value, judges whether the blood oxygen saturation is
lower than the second threshold value, and wherein the display
unit, in a case where the judging unit judges that the blood oxygen
saturation is lower than the second threshold value, flickeringly
displays the blood oxygen saturation at a second frequency greater
than the first frequency.
3. The oximeter according to claim 2, wherein the storage unit
further stores a third threshold value smaller than the second
threshold value, wherein the judging unit, in a case where it is
judged that the blood oxygen saturation is lower than the second
threshold value, judges whether the blood oxygen saturation is
lower than the third threshold value, and wherein the display unit,
in a case where the judging unit judges that the blood oxygen
saturation is lower than the third threshold value, flickeringly
displays the blood oxygen saturation at a third frequency greater
than the second frequency.
4. The oximeter according to claim 1, wherein the storage unit
further stores a first duration, wherein the judging unit, in a
case where it is judged that the blood oxygen saturation is lower
than the first threshold value, judges whether a duration in this
case exceeds the first duration, and wherein the display unit, in a
case where the judging unit judges that the blood oxygen saturation
is lower than the first threshold value and it continues for the
first duration, flickeringly displays the blood oxygen saturation
at the first frequency.
5. The oximeter according to claim 2, wherein the storage unit
further stores a second duration smaller than or equal to the first
duration, wherein the judging unit, in a case where it is judged
that the blood oxygen saturation is lower than the second threshold
value, judges whether a duration in this case exceeds the second
duration, and wherein the display unit, in a case where the judging
unit judges that the blood oxygen saturation is lower than the
second threshold value and it continues for the second duration,
flickeringly displays the blood oxygen saturation at the second
frequency.
6. The oximeter according to claim 3, wherein the storage unit
further stores a third duration smaller than or equal to the second
duration, wherein the judging unit, in a case where it is judged
that the blood oxygen saturation is lower than the third threshold
value, judges whether a duration in this case exceeds the third
duration, and wherein the display unit, in a case where the judging
unit judges that the blood oxygen saturation is lower than the
third threshold value and it continues for the third duration,
flickeringly displays the blood oxygen saturation at the third
frequency.
7. The oximeter according to claim 1, further comprising an input
unit for setting at least one of the first threshold value, the
second threshold value, the third threshold value, the first
frequency, the second frequency, the third frequency, the first
duration, the second duration, and the third duration.
8. The oximeter according to claim 1, wherein the display unit
further displays cumulative unprocessed alarm information.
9. The oximeter according to claim 1, further comprising a wireless
communication unit that receives a parameter setting instruction
from a mobile terminal and sends alarm information to the mobile
terminal.
10. The oximeter according to claim 1, wherein the oximeter is a
finger clip oximeter, a wrist oximeter, or a head-mounted oximeter,
wherein a blood oxygen collecting unit of the finger clip oximeter
comprises a concave blood oxygen collecting port in which a finger
can be put, wherein the first light emitting unit, the second light
emitting unit, and the light receiving sensor are set in the
concave blood oxygen collecting port, wherein a blood oxygen
collecting unit of the wrist oximeter comprises a blood oxygen
finger clip set outside a casing, and wherein the blood oxygen
finger clip is connected with an interface set at the casing.
11. The oximeter according to claim 2, wherein the display unit, in
the case where the judging unit judges that the blood oxygen
saturation is lower than the first threshold value, displays the
blood oxygen saturation in a first font, and in the case where the
judging unit judges that the blood oxygen saturation is lower than
the second threshold value, displays the blood oxygen saturation in
a second font greater than the first font.
12. The oximeter according to claim 11, wherein the display unit,
in a case where the judging unit judges that the blood oxygen
saturation is lower than the third threshold value, displays the
blood oxygen saturation in a third font greater than the second
font.
13. The oximeter according to claim 2, wherein the display unit, in
the case where the judging unit judges that the blood oxygen
saturation is lower than the first threshold value, displays the
blood oxygen saturation in a first brightness, and in the case
where the judging unit judges that the blood oxygen saturation is
lower than the second threshold value, displays the blood oxygen
saturation in a second brightness greater than the first
brightness.
14. The oximeter according to claim 13, wherein the display unit,
in a case where the judging unit judges that the blood oxygen
saturation is lower than the third threshold value, displays the
blood oxygen saturation in a third brightness greater than the
second brightness.
15. The oximeter according to claim 4, wherein in the case where
the judging unit judges that the blood oxygen saturation is lower
than the first threshold value, counting of the duration is
started, and before the first duration is reached and in a case
where the blood oxygen saturation is lower than a second threshold
value, counting of the duration is continued.
16. The oximeter according to claim 4, wherein the display unit, in
the case where the judging unit judges that the blood oxygen
saturation is lower than the first threshold value and it continues
for the first duration, after further delaying a predetermined
alarm duration, flickeringly displays the blood oxygen saturation
at the first frequency.
17. The oximeter according to claim 1, wherein the display unit
sets a flickering frequency, a display font, and/or a display
brightness based on level of abnormality degree.
18. The oximeter according to claim 17, wherein the level of
abnormality degree is graded based on the rate of change of the
blood oxygen saturation or the number of exceeding the threshold
values of the blood oxygen saturation.
19. The oximeter according to claim 18, wherein the rate of change
of the blood oxygen saturation is calculated based on the following
Equation 1: V.sub.i=((a-1)*(A.sub.i-A.sub.i-1)/T+V.sub.i-1)/a
Equation 1 where a is an adjustment coefficient, T is an overrun
time, V.sub.i is the latest real-time rate of change, V.sub.i-1 is
the last real-time rate of change, A.sub.i is the latest
measurement data, and A.sub.i-1 is the last measurement data.
20. The oximeter according to claim 4, wherein at least one of the
first duration, the second duration, and the third duration is
calculated based on the following Equation 2:
T=((Ht-Lt)/(B-1)*A+Lt)/(B-A) Equation 2 where A is measured data, B
is a set threshold value, Ht is the maximum delay time, and Lt is
the minimum delay time.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This patent application is a National Stage Entry of
PCT/CN2019/100795 filed on Aug. 15, 2019, which claims the benefit
and priority of Chinese Patent Application No. 201810932722.9 filed
on Aug. 16, 2018, the disclosures of which are incorporated by
reference herein in their entirety as part of the present
application.
BACKGROUND
[0002] Embodiments of the present disclosure relate to an oximeter,
and particularly to an oximeter that performs a flickering alarm at
a low blood oxygen saturation.
[0003] Oximeter is used to detect the blood oxygen saturation of a
human body, and the blood oxygen saturation is one of the important
physiological parameters reflecting human body health. More and
more patients are measuring their health status by monitoring blood
oxygen saturation.
[0004] In the prior art, when it is detected that the blood oxygen
saturation is lower than a threshold value, the patient or the
medical staff is usually alerted by vibration stimulation or sound
stimulation, and the user may also be alerted by visual
stimulation.
[0005] Specifically, Patent Document 1 (CN201720778672.4) relates
to a mobile communication terminal. When the blood oxygen
saturation of a human body is lower than a preset value, an alarm
device issues an alarm and a warning lamp flickers.
[0006] Patent Document 2 (CN201320543579.7) relates to a palm-type
pulse oximeter which is made to have a function of prompt tone for
measured abnormal values by setting a buzzer. At the same time, an
indicator lamp is added to realize a flickering indication function
for abnormal values.
[0007] Patent Document 3 (CN201120199935.9) relates to an oximeter,
in which a control unit controls a display means to display
measurement values in different ranges in different colors based on
judgment result of a judging unit. In Patent Document 3, the
measurement results may be marked or prompted, so that the surveyor
can intuitively and clearly know whether his/her blood oxygen
saturation is normal or not, which improves the user experience of
the oximeter.
BRIEF DESCRIPTION
[0008] Inventor of the present disclosure finds out that the
above-mentioned prior art has the following problems.
[0009] Patent Documents 1 and 2 both alert the user by adding an
alarm, a buzzer, or an indicator lamp, increasing the cost of the
equipment. Patent Document 3 only issues a warning by color change
of the measurement parameters, and the warning effect is not
obvious enough.
[0010] In view of the above-mentioned shortcomings of the prior
art, the present disclosure provides an oximeter that performs a
flickering alarm at a low blood oxygen saturation, and
specifically, provides the following technical solution.
[0011] An oximeter is provided, including a blood oxygen collecting
unit that has a first light emitting unit, a second light emitting
unit, and a light receiving sensor, the first light emitting unit
emitting a red light, the second light emitting unit emitting an
infrared light, and the light receiving sensor receiving the red
light emitted by the first light emitting unit and not absorbed by
a human body and the infrared light emitted by the second light
emitting unit and not absorbed by the human body, and converting
them into an electrical signal, a storage unit that stores a first
threshold value, a microprocessor that calculates a blood oxygen
saturation of the human body based on the electrical signal
detected by the light receiving sensor, and includes a judging unit
that judges whether the blood oxygen saturation is lower than the
first threshold value, and a display unit that, in a case where the
judging unit judges that the blood oxygen saturation is lower than
the first threshold value, flickeringly displays the blood oxygen
saturation at a first frequency.
[0012] The oximeter of the present disclosure, which alerts the
user by flickeringly displaying the blood oxygen saturation at a
predetermined frequency, may significantly improve the warning
effect without increasing the equipment cost. In addition, visual
stimulation is suitable for patients with hearing impairments, and
it is also suitable for noisy environments. At the same time,
sound-free prompts would not affect other people's rest, life, or
work.
[0013] Alternatively, the storage unit further stores a second
threshold value smaller than the first threshold value. The judging
unit, in a case where it is judged that the blood oxygen saturation
is lower than the first threshold value, judges whether the blood
oxygen saturation is lower than the second threshold value. The
display unit, in a case where the judging unit judges that the
blood oxygen saturation is lower than the second threshold value,
flickeringly displays the blood oxygen saturation at a second
frequency greater than the first frequency.
[0014] Alternatively, the storage unit further stores a third
threshold value smaller than the second threshold value. The
judging unit, in a case where it is judged that the blood oxygen
saturation is lower than the second threshold value, judges whether
the blood oxygen saturation is lower than the third threshold
value. The display unit, in a case where the judging unit judges
that the blood oxygen saturation is lower than the third threshold
value, flickeringly displays the blood oxygen saturation at a third
frequency greater than the second frequency.
[0015] Alternatively, the storage unit further stores a first
duration. The judging unit, in a case where it is judged that the
blood oxygen saturation is lower than the first threshold value,
judges whether a duration in this case exceeds the first duration.
The display unit, in a case where the judging unit judges that the
blood oxygen saturation is lower than the first threshold value and
it continues for the first duration, flickeringly displays the
blood oxygen saturation at the first frequency.
[0016] Alternatively, the storage unit further stores a second
duration smaller than or equal to the first duration. The judging
unit, in a case where it is judged that the blood oxygen saturation
is lower than the second threshold value, judges whether a duration
in this case exceeds the second duration. The display unit, in a
case where the judging unit judges that the blood oxygen saturation
is lower than the second threshold value and it continues for the
second duration, flickeringly displays the blood oxygen saturation
at the second frequency.
[0017] Alternatively, the storage unit further stores a third
duration smaller than or equal to the second duration. The judging
unit, in a case where it is judged that the blood oxygen saturation
is lower than the third threshold value, judges whether a duration
in this case exceeds the third duration. The display unit, in a
case where the judging unit judges that the blood oxygen saturation
is lower than the third threshold value and it continues for the
third duration, flickeringly displays the blood oxygen saturation
at the third frequency.
[0018] Alternatively, the oximeter further includes an input unit
for setting at least one of the first threshold value, the second
threshold value, the third threshold value, the first frequency,
the second frequency, the third frequency, the first duration, the
second duration, and the third duration.
[0019] Alternatively, the oximeter further includes an I/O
interface for charging the battery unit and/or connecting to other
blood oxygen collecting devices.
[0020] Alternatively, the oximeter further includes a wireless
communication unit.
[0021] Alternatively, the oximeter is a finger clip oximeter, a
wrist oximeter, or a head-mounted oximeter. A blood oxygen
collecting unit of the finger clip oximeter includes a concave
blood oxygen collecting port in which a finger can be put. The
first light emitting unit, the second light emitting unit, and the
light receiving sensor are set in the concave blood oxygen
collecting port. A blood oxygen collecting unit of the wrist
oximeter includes a blood oxygen finger clip set outside a casing,
and the blood oxygen finger clip is connected with an interface set
at the casing.
[0022] The oximeter according to the present disclosure, in which
the lower the blood oxygen saturation is, the higher the flickering
frequency is, thus can further improve the warning effect in an
emergency situation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to describe the technical solutions of the
embodiments of the present disclosure more clearly, drawings of the
embodiments will be briefly described below. Obviously, the
drawings described below merely relate to some embodiments of the
present disclosure, other than restrictions to the present
disclosure.
[0024] FIG. 1 is a schematic structural diagram of an oximeter
according to an embodiment of the present disclosure.
[0025] FIG. 2 is an example of a screen displayed by a display unit
of an oximeter according to an embodiment of the present
disclosure.
[0026] FIG. 3 is another example of a screen displayed by a display
unit of an oximeter according to an embodiment of the present
disclosure.
[0027] FIG. 4 is an example of a wrist oximeter according to an
embodiment of the present disclosure.
DETAILED DESCRIPTION
[0028] In order to clarify the technical solution and advantages of
the embodiments of the present disclosure, the technical solutions
of the embodiments of the present disclosure will be clearly and
completely described in conjunction with the drawings of the
embodiments of the present disclosure below. Obviously, the
embodiments to be described refer to a part of the embodiments of
the present disclosure, other than all of the embodiments. On the
basis of the embodiments of the present disclosure to be described,
all other embodiments those skilled in the art obtain requiring no
inventive effort also belong to the scope protected by the present
disclosure.
[0029] FIG. 1 is a schematic structural diagram of an oximeter
according to an embodiment of the present disclosure.
[0030] As shown in FIG. 1, the oximeter 1 of the present embodiment
includes a blood oxygen collecting unit 2 that has a first light
emitting unit 21, a second light emitting unit 22, and a light
receiving sensor 23, the first light emitting unit 21 emitting a
red light, the second light 22 emitting unit emitting an infrared
light, and the light receiving sensor 23 receiving the red light
emitted by the first light emitting unit 21 and not absorbed by a
human body and the infrared light emitted by the second light
emitting unit 22 and not absorbed by the human body, and converting
them into an electrical signal, a storage unit 3 that stores a
first threshold value, a microprocessor 4 that calculates a blood
oxygen saturation of the human body based on the electrical signal
detected by the light receiving sensor 23, and includes a judging
unit 41 that judges whether the blood oxygen saturation is lower
than the first threshold value, and a display unit 5 that, in a
case where the judging unit 41 judges that the blood oxygen
saturation is lower than the first threshold value, flickeringly
displays the blood oxygen saturation at a first frequency.
[0031] The oximeter 1 of the present embodiment may be a portable
oximeter such as a finger clip oximeter, a wrist oximeter, or a
head-mounted oximeter well-known in the art, and it may further be
a table oximeter used in hospital, and the present disclosure has
no limitation on this.
[0032] The blood oxygen collecting unit 2 of the present embodiment
has a first light emitting unit 21, a second light emitting unit
22, and a light receiving sensor 23. The first light emitting unit
21 and the second light emitting unit 22 are, for instance, LEDs,
which are light emitting diodes. The first light emitting unit 21
emits a red light of 660 nm for instance, and the second light
emitting unit 22 emits an infrared light of 905 nm, 910 nm, or 940
nm for instance. The light receiving sensor 23 is, for instance, a
photosensitive sensor, receiving lights emitted by the first light
emitting unit 21 and the second light emitting unit 22 and not
absorbed by the human body, and converting them into an electrical
signal.
[0033] In a specific working process, the first light emitting unit
21 and the second light emitting unit 22 may alternately emit
light. In this way, the light receiving sensor 23 can alternately
receive the red light emitted by the first light emitting unit 21
and not absorbed by the human body and the infrared light emitted
by the second light emitting unit 22 and not absorbed by the human
body. In addition, the light receiving sensor 23 may include two
sensors, each of which independently receives the lights emitted by
the first light emitting unit 21 and the second light emitting unit
22 and not absorbed by the human body. In this way, the first light
emitting unit 21 and the second light emitting unit 22 do not need
to emit light alternately, but may emit light continuously.
[0034] Furthermore, the blood oxygen collecting unit 2 may also
include three or more light emitting units to improve the
collection accuracy.
[0035] In a case where the oximeter 1 is a finger clip oximeter, a
blood oxygen collecting unit 2 includes a concave blood oxygen
collecting port in which a finger can be put, and the first light
emitting unit 21, the second light emitting unit 22, and the light
receiving sensor 23 are set in the concave blood oxygen collecting
port.
[0036] In a case where the oximeter 1 is a wrist oximeter, a blood
oxygen collecting unit 2 includes a blood oxygen finger clip set
outside a casing, and the blood oxygen finger clip is connected
with an interface set at the casing. In addition, the blood oxygen
collecting unit 2 of the wrist oximeter may also be set inside the
casing.
[0037] Specifically, FIG. 4 is an example of a wrist oximeter
according to an embodiment of the present disclosure. As shown in
FIG. 4, the blood oxygen collecting unit 2 of the wrist oximeter,
i.e., a blood oxygen finger clip, is set outside, and the blood
oxygen finger clip is set to be connected with an interface of the
casing.
[0038] In a case where the oximeter 1 is a head-mounted oximeter, a
blood oxygen collecting unit 2 may be set outside or inside the
casing like a wrist oximeter. When set outside, the blood oxygen
collecting unit 2 is connected through an interface set on the
casing.
[0039] The blood oxygen collecting unit 2 sends the collected
electrical signal to the microprocessor 4 which calculates the
blood oxygen saturation of the human body based on the received
electrical signal. The method for the microprocessor 4 to calculate
the blood oxygen saturation based on the electrical signal
collected by the blood oxygen collecting unit 2 may be any method
known in the art, and is not described in detail in the present
disclosure.
[0040] The microprocessor 4 includes a judging unit 41 that judges
whether the calculated blood oxygen saturation is lower than a
first threshold value stored in the storage unit 3.
[0041] The display unit 5, in a case where the judging unit 41
judges that the blood oxygen saturation is lower than the first
threshold value, flickeringly displays the blood oxygen saturation
at the first frequency. Any one or more of a bar graph, a blood
oxygen value, a pulse rate value, a PI value, and a waveform graph
can be displayed on the display unit 5 of the present embodiment,
and the present disclosure has no limitation on this.
[0042] Specifically, FIG. 2 is an example of a screen displayed by
a display unit of an oximeter according to an embodiment of the
present disclosure. FIG. 3 is another example of a screen displayed
by a display unit of an oximeter according to an embodiment of the
present disclosure. As shown in FIG. 2, a bar graph, a blood oxygen
value, a pulse rate value, and a waveform graph are displayed on
the display unit 5. As shown in FIG. 3, a bar graph, a blood oxygen
value, a pulse rate value, and a PI value are displayed on the
display unit 5.
[0043] In the present embodiment, the display unit 5 may
flickeringly display the blood oxygen saturation. In addition, the
entire screen of the display unit 5 may be flickeringly displayed,
or the blood oxygen saturation and other parameter values may be
alternately flickeringly displayed to alert the user.
[0044] The oximeter 1 according to the present embodiment, which
alerts the user by flickeringly displaying the blood oxygen
saturation at a first frequency, may significantly improve the
warning effect without increasing the equipment cost. In addition,
visual stimulation is suitable for patients with hearing
impairments, and it is also suitable for noisy environments. At the
same time, sound-free prompts would not affect other people's rest,
life, or work.
[0045] Alternatively, the storage unit further stores a second
threshold value smaller than the first threshold value. The judging
unit, in a case where it is judged that the blood oxygen saturation
is lower than the first threshold value, judges whether the blood
oxygen saturation is lower than the second threshold value. The
display unit, in a case where the judging unit judges that the
blood oxygen saturation is lower than the second threshold value,
flickeringly displays the blood oxygen saturation at a second
frequency greater than the first frequency.
[0046] Alternatively, the storage unit further stores a third
threshold value smaller than the second threshold value. The
judging unit, in a case where it is judged that the blood oxygen
saturation is lower than the second threshold value, judges whether
the blood oxygen saturation is lower than the third threshold
value. The display unit, in a case where the judging unit judges
that the blood oxygen saturation is lower than the third threshold
value, flickeringly displays the blood oxygen saturation at a third
frequency greater than the second frequency.
[0047] Alternatively, the storage unit further stores a first
duration. The judging unit, in a case where it is judged that the
blood oxygen saturation is lower than the first threshold value,
judges whether a duration in this case exceeds the first duration.
The display unit, in a case where the judging unit judges that the
blood oxygen saturation is lower than the first threshold value and
it continues for the first duration, flickeringly displays the
blood oxygen saturation at the first frequency.
[0048] Alternatively, the storage unit further stores a second
duration smaller than or equal to the first duration. The judging
unit, in a case where it is judged that the blood oxygen saturation
is lower than the second threshold value, judges whether a duration
in this case exceeds the second duration. The display unit, in a
case where the judging unit judges that the blood oxygen saturation
is lower than the second threshold value and it continues for the
second duration, flickeringly displays the blood oxygen saturation
at the second frequency.
[0049] Alternatively, the storage unit further stores a third
duration smaller than or equal to the second duration. The judging
unit, in a case where it is judged that the blood oxygen saturation
is lower than the third threshold value, judges whether a duration
in this case exceeds the third duration. The display unit, in a
case where the judging unit judges that the blood oxygen saturation
is lower than the third threshold value and it continues for the
third duration, flickeringly displays the blood oxygen saturation
at the third frequency.
[0050] The above embodiment will be described with a specific
example below.
Example 1
[0051] The first threshold value is 90%, the second threshold value
is 85%, and the third threshold value is 80%. When the real-time
monitored blood oxygen saturation is greater than or equal to 90%,
no action is triggered; when it is lower than 90% and lasts for 10
seconds within this range (which means, the first duration is 10
seconds), the display parameter (i.e., the blood oxygen saturation)
in the display screen of the display module flickers at a frequency
of 0.5 times/second (i.e., at the first frequency); when it is
lower than 85% and lasts for 9 seconds within this range (which
means, the second duration is 9 seconds), the display parameter
flickers at a frequency of 1 time/second (i.e., at the second
frequency); and when it is lower than 80% and lasts for 8 seconds
within this range (which means, the third duration is 8 seconds),
the display parameter flickers at a frequency of 2 times/second
(i.e., at the third frequency).
[0052] Specifically, it is shown in Table 1 below.
TABLE-US-00001 TABLE 1 threshold value duration frequency first 90%
10 seconds 0.5 times/second second 85% 9 seconds .sup. 1
time/second third 80% 8 seconds .sup. 2 times/second
[0053] In the oximeter of the above embodiment of the present
disclosure, the lower the blood oxygen saturation is, the shorter
the waiting time for flickering is, and the higher the flickering
frequency is, so that the warning effect in an emergency situation
can be further improved.
[0054] In the above embodiment, although three threshold values as
well as three durations and three flickering frequencies
corresponding thereto are set, the present disclosure is not
limited thereto. A curve of threshold values corresponding to
durations and flickering frequencies may also be stored in the
storage unit 3. The curve may satisfy that the lower the blood
oxygen saturation is, the shorter the duration is, and the higher
the flickering frequency is.
[0055] Furthermore, when it is judged that the blood oxygen
saturation is lower than the first threshold value, counting the
duration is started. If the blood oxygen saturation is lower than
the second threshold value before the first duration is reached, it
is preferable to continue counting the duration without recounting
the duration. This can ensure that the user is alerted by a
flickering display in time in a case where the blood oxygen
saturation continuously decreases.
[0056] The oximeter 1 according to the present embodiment may
further include an input unit 7, and at least one of the first
threshold value, the second threshold value, the third threshold
value, the first frequency, the second frequency, the third
frequency, the first duration, the second duration, and the third
duration is set by the input unit 7.
[0057] The input unit 7 is, for instance, a button. The button may
be one or more elastic cylindrical buttons set in the casing and
protruding from the surface of the casing. By pressing the button,
the machine can be turned on and off, the function can be set, and
the threshold values, frequencies, and durations can be set.
[0058] Furthermore, instead of setting the input unit 7, the input
function may be set at the display unit 5. For instance, the
display unit 5 has a touch control function, and the user
implements the input control described above through the display
unit 5.
[0059] Furthermore, the oximeter 1 according to the present
embodiment may further include a wireless communication unit 8 that
receives a parameter setting instruction from a mobile terminal and
sends alarm information to the mobile terminal. The user can
communicate with the wireless communication unit 8 through the
mobile terminal, control the oximeter 1, or transmit the data
detected by the oximeter 1 to the mobile terminal.
[0060] Furthermore, the oximeter 1 according to the present
embodiment may further include a power supply unit 6. The battery
unit 6 may be a dry battery or a rechargeable battery, and supplies
power to various components of the oximeter 1.
[0061] Furthermore, the oximeter 1 according to the present
embodiment may further include an I/O interface 9 which is, for
instance, a USB interface. In a case where the battery unit 6 is a
rechargeable battery, the battery unit 6 may be charged through the
I/O interface 9.
[0062] Furthermore, the I/O interface 9 can be used as a collecting
interface for externally connecting to other blood oxygen
collecting devices 10, so that it can be connected to a traditional
finger clip or finger sleeve blood oxygen collecting device, which
is suitable for nighttime or long-term monitoring.
[0063] Furthermore, the display unit 6, in the case where the
judging unit judges that the blood oxygen saturation is lower than
the first threshold value, displays the blood oxygen saturation in
a first font, and in the case where the judging unit judges that
the blood oxygen saturation is lower than the second threshold
value, displays the blood oxygen saturation in a second font
greater than the first font. The display unit, in a case where the
judging unit judges that the blood oxygen saturation is lower than
the third threshold value, displays the blood oxygen saturation in
a third font greater than the second font.
[0064] Furthermore, the display unit 6, in the case where the
judging unit judges that the blood oxygen saturation is lower than
the first threshold value, displays the blood oxygen saturation in
a first brightness, and in the case where the judging unit judges
that the blood oxygen saturation is lower than the second threshold
value, displays the blood oxygen saturation in a second brightness
greater than the first brightness. The display unit, in a case
where the judging unit judges that the blood oxygen saturation is
lower than the third threshold value, displays the blood oxygen
saturation in a third brightness greater than the second
brightness.
[0065] Specifically, the display font of the measurement parameters
can be enlarged and displayed along with the levels; for instance,
the size of the font can be changed from 12*12 pixels to 20*20
pixels, and further changed to 30*30 pixels. Along with the levels,
different levels of backlight intensity are used, such as low
brightness, medium brightness, and high brightness. The brightness
can be changed by changing the power supply voltage of the display
screen, and the voltage can be changed by connecting resistors with
different resistance values in series or by PWM adjustment. To make
it easier to see the flickering effect, small fonts and low
brightness are used for the default display. This is to extend the
life of the machine, and large font or high brightness is intended
to attract attention. The font size and display levels of a
backlight can be set.
[0066] Furthermore, in the case where the judging unit judges that
the blood oxygen saturation is lower than the first threshold
value, counting of the duration is started, and before the first
duration is reached and in a case where the blood oxygen saturation
is lower than a second threshold value, counting of the duration is
continued.
[0067] Furthermore, the display unit 6, in the case where the
judging unit judges that the blood oxygen saturation is lower than
the first threshold value and it continues for the first duration,
after further delaying a predetermined alarm duration, flickeringly
displays the blood oxygen saturation at the first frequency.
[0068] Specifically, in order to further increase the stability of
the alarm, judging of delaying the alarm duration is added. When
the measured data exceeds the threshold value, the duration is
counted, and when the corresponding duration is exceeded, an alarm
is triggered after delaying the corresponding alarm duration.
[0069] Furthermore, the display unit 6 sets a flickering frequency,
a display font, and/or a display brightness based on level of
abnormality degree. The level of abnormality degree is graded based
on the rate of change of the blood oxygen saturation or the number
of exceeding the threshold values of the blood oxygen
saturation.
[0070] The rate of change of the blood oxygen saturation is
calculated based on the following Equation 1:
V.sub.i=((a-1)*(A.sub.i-A.sub.i-1)/T+V.sub.i-1)/a Equation 1
[0071] where a is an adjustment coefficient, T is an overrun time,
V.sub.i is the latest real-time rate of change, V.sub.i-1 is the
last real-time rate of change, A.sub.i is the latest measurement
data, and A.sub.i-1 is the last measurement data.
[0072] When the threshold values or/and the delay time ranges are
too great due to improper setting by the user, it may not respond
in time to a sharp deterioration. However, the sharp deterioration
is worthy of attention, so dynamic change may be used to improve
the reliability of the alarm.
[0073] The abnormality degree is actually the change speed, the
rate of change or the number of exceeding the threshold values of
data within the overrun time. The greater the change speed, the
rate of change or the number of exceeding the threshold values is,
the higher the abnormality degree is.
[0074] For instance, the change speeds of data are 2%/overrun time,
5%/overrun time, and 10%/overrun time, and correspond to the first,
second, and third levels of abnormality degree, respectively. The
rate of change is the difference between the latest measurement
data and the last measurement data. There are positive rates of
change and negative rates of change. A positive rate of change
indicates that the latest value is greater than the last value, for
example, when describing blood oxygen saturation, it indicates that
the value is increasing. A negative rate of change indicates a
decrease in value, and a decrease in value indicates a trend of
deterioration. In order to avoid the influence of the fluctuation
of the single data difference, the actually adopted rate of change
is calculated using the above Equation 1, where a can be adjusted
accordingly according to the collection frequency of data. For
instance, when the collection frequency is 120 Hz, the value of a
is 32. False alarms due to interference data can be avoided by
using this Equation to calculate the actually adopted rate of
change.
[0075] Furthermore, the number of exceeding the threshold values of
the data measured within the overrun time is described as follows:
when the measurement data exceeds a threshold value for the first
time, the number is counted as 1. When the data falls back to the
normal value, and then exceeds the threshold value again, the
number is added with 1 and counted as 2. Accumulation is performed
sequentially in the duration (where the measured data is not stable
enough within the overrun time, and this mechanism is introduced in
order to draw attention to data fluctuation).
[0076] When the abnormality degree exceeds a preset value, as the
abnormality degree increases, the delay time becomes shorter, the
threshold value range becomes smaller, and the frequency becomes
higher. Conversely, as the abnormality degree becomes lower, the
delay time becomes longer, the threshold value range becomes
greater, and the frequency becomes lower.
[0077] Specifically, when the change speed exceeds a preset value,
the greater the absolute value of the change speed is, the smaller
the threshold value setting range and/or the shorter the delay time
and/or the higher the frequency is, and otherwise the parameters
will not be adjusted. Correspondingly, when the number of exceeding
the threshold values exceeds a preset value, the greater the number
is, the smaller the threshold value setting range and/or the
shorter the delay time and/or the higher the frequency is, and
otherwise the parameters will not be adjusted.
[0078] Furthermore, the delay time, for instance, at least one of
the first duration, the second duration, and the third duration is
calculated based on the following Equation 2:
T=((Ht-Lt)/(B-1)*A+Lt)/(B-A) Equation 2
[0079] where A is measured data, B is a set threshold value, Ht is
the maximum delay time, and Lt is the minimum delay time.
[0080] When the measured data is smaller than a low threshold
value, the smaller the measured data (i.e., the greater the
abnormality degree) is, the shorter the delay time is, and the
higher the response rate is. If the measured data is A and the set
threshold is B, the maximum value is B-1 when the measured data
meets the alarm, which corresponds to the maximum delay time Ht.
The minimum value of the measured data is 0, which corresponds to
the minimum delay time Lt. The setting of the delay time takes into
account the convenience of data processing and the requirements for
processor processing capacity. As for the relationship between the
data, the calculation amount of a linear function is relatively
minimal. At the same time, the conditions for generating the alarm
need to be added, and it is derived that the relationship between
the measured data A and the delay time T is the above Equation 2,
wherein the numerator is composed of a linear function determined
by the set maximum delay time and the minimum delay time, while the
denominator is obtained according to the minimum requirements for
generating an alarm under actual conditions.
[0081] Furthermore, the display unit 6 further displays cumulative
unprocessed alarm information.
[0082] After an alarm is generated, it can be turned off by medical
staff. Or, if it is not effectively processed for a certain period
of time and has returned to the normal value for a period of time,
the alarm is turned off and a cumulative non-alarm reminder flag is
added. The alarms under different threshold values are displayed
separately, and the displaying can be numerical values, icons, etc.
The flag is set to indicate that an alarm has occurred to draw
attention, which can make it easier for medical staff to review the
incident and guide care.
[0083] Although the oximeter according to the present disclosure
has been described in detail through some exemplary embodiments,
the above embodiments are not exhaustive. Those skilled in the art
may implement various changes and modifications within the spirit
and scope of the present invention. Therefore, the present
disclosure is not limited to these embodiments, and the protection
scope of the present disclosure is determined only by the appended
claims.
* * * * *