CN113017602A - Respiratory frequency measuring method and physical sign monitor - Google Patents
Respiratory frequency measuring method and physical sign monitor Download PDFInfo
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- CN113017602A CN113017602A CN202110216015.1A CN202110216015A CN113017602A CN 113017602 A CN113017602 A CN 113017602A CN 202110216015 A CN202110216015 A CN 202110216015A CN 113017602 A CN113017602 A CN 113017602A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/0816—Measuring devices for examining respiratory frequency
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
Abstract
The invention discloses a respiratory frequency measuring method and a physical sign monitor. The respiratory frequency measuring method comprises the following steps: acquiring a photoplethysmogram acquired by a blood oxygen saturation sensor; identifying the amplitude and the coordinate value of each beat of pulse of the photoplethysmography, and carrying out interpolation processing on the amplitude and the coordinate value to obtain a respiratory waveform, wherein the respiratory waveform is a waveform representing the relationship between the amplitude and the coordinate value; a respiratory frequency is calculated based on the respiratory waveform. The physical sign monitor executes the respiratory frequency measuring method. According to the invention, no part is required to be additionally arranged on the existing sign monitor, so that the sign monitor can ensure the convenience of the sign monitor while increasing the respiratory frequency measurement function, and the respiratory monitoring can be realized without increasing the cost.
Description
Technical Field
The invention relates to the field of physical sign monitoring, in particular to a respiratory frequency measuring method and a physical sign monitor.
Background
Medical personnel hope at the in-process that vital sign gathered that it is better that carrying equipment is less, and at present, portable guardianship equipment can only detect body temperature, blood pressure, oxyhemoglobin saturation, pulse rate parameter, breathes and can only pass through medical personnel's manual computation and type-in, and the operation is convenient, inefficiency inadequately. And the breathing rate can be detected by using other additional equipment, so that the workload of medical personnel is increased, the operation is inconvenient, and the efficiency is influenced.
Disclosure of Invention
The invention aims to provide a respiratory frequency measuring method capable of being integrated on the existing physical sign monitor and the physical sign monitor integrated with the respiratory frequency measuring function.
In order to achieve the purpose, the invention provides the following scheme:
a respiratory rate measurement method, the respiratory rate measurement method comprising:
step 1: acquiring a photoplethysmogram acquired by a blood oxygen saturation sensor;
step 2: identifying the amplitude and the coordinate value of each beat of pulse of the photoplethysmography, and carrying out interpolation processing on the amplitude and the coordinate value to obtain a respiratory waveform, wherein the respiratory waveform is a waveform representing the relationship between the amplitude and the coordinate value;
and step 3: a respiratory frequency is calculated based on the respiratory waveform.
Optionally, between step 1 and step 2, further comprising:
filtering the photoplethysmographic pulse wave.
Optionally, the filtering the photoplethysmographic pulse wave specifically includes:
and filtering the photoplethysmography by adopting a band-pass filter with the cut-off frequency of 0.1-4.2 Hz.
Optionally, between step 2 and step 3, further comprising:
and performing autocorrelation processing on the respiration waveform.
Optionally, step 3 specifically includes:
according to F-100 n/(x)n+i-xi) Calculating a respiratory frequency F, wherein F is F n/(x)n+i-xi) Calculating a respiratory frequency F, wherein F is a sampling frequency xn+iIs the coordinate value, x, corresponding to the n + i th peak value in the respiratory waveformiAnd the coordinate value is the coordinate value corresponding to the ith peak value in the respiratory waveform.
The invention also provides a sign monitor, comprising: a blood oxygen saturation sensor and a processor, the processor comprising a respiratory rate calculation module, the respiratory rate calculation module comprising:
the photoelectric volume pulse wave acquisition unit is used for acquiring the photoelectric volume pulse wave acquired by the blood oxygen saturation sensor;
the respiratory waveform determining unit is used for identifying the amplitude and the coordinate value of each beat of pulse of the photoplethysmography and carrying out interpolation processing on the amplitude and the coordinate value to obtain a respiratory waveform, wherein the respiratory waveform is a waveform representing the relationship between the amplitude and the coordinate value;
a respiratory frequency calculation unit for calculating a respiratory frequency based on the respiratory waveform.
Optionally, the respiratory rate calculation module further includes:
and the photoelectric volume pulse wave filtering unit is used for filtering the photoelectric volume pulse wave.
Optionally, the photoplethysmography filtering unit specifically includes:
and the photoelectric volume pulse wave filtering subunit is used for filtering the photoelectric volume pulse wave by adopting a band-pass filter with the cut-off frequency of 0.1-4.2 Hz.
Optionally, the respiratory rate calculation module further includes:
and the autocorrelation processing unit is used for carrying out autocorrelation processing on the respiratory waveform.
Optionally, the respiratory frequency calculation unit specifically includes:
a respiratory rate calculation subunit for calculating a respiratory rate from F ═ F × n/(x)n+i-xi) Calculating a respiratory frequency F, wherein F is a sampling frequency xn+iIs the coordinate value, x, corresponding to the n + i th peak value in the respiratory waveformiAnd the coordinate value is the coordinate value corresponding to the ith peak value in the respiratory waveform.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the respiratory frequency measuring method and the physical sign monitor provided by the invention obtain respiratory waves based on the photoplethysmography acquired by the blood oxygen saturation sensor, namely, a relationship curve between the amplitude and the coordinate value is constructed by identifying the amplitude and the coordinate value of each beat of pulse in the photoplethysmography acquired by the blood oxygen saturation sensor, so that the respiratory waveform is obtained. And further realizes the respiratory frequency measurement based on the respiratory waveform. Compared with the method for measuring the respiratory frequency by using the chest impedance and the respiratory airflow method in the prior art, the method for measuring the respiratory frequency of the physical sign monitor does not need to add a part on the conventional physical sign monitor, not only increases the respiratory frequency measurement function of the physical sign monitor, but also ensures the convenience of the physical sign monitor and saves the cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a respiratory rate measuring method according to embodiment 1 of the present invention;
FIG. 2 is a diagram of photoplethysmography in accordance with embodiment 1 of the present invention;
FIG. 3 is a diagram showing a respiratory waveform in example 1 of the present invention;
FIG. 4 is a waveform diagram of a respiration waveform obtained by auto-correlation according to example 1 of the present invention;
figure 5 is a schematic structural diagram of a respiratory rate measurement module in the sign monitor provided in embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a respiratory frequency measuring method capable of being integrated on the existing physical sign monitor and the physical sign monitor integrated with the respiratory frequency measuring function.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
The embodiment provides a respiratory rate measuring method which can be integrated on the existing physical sign monitor, and the respiratory rate measuring function is integrated on the physical sign monitor without adding any accessory. The respiratory rate measuring method comprises the following steps:
step 1: acquiring a photoplethysmogram acquired by the blood oxygen saturation sensor, wherein the photoplethysmogram is shown in figure 2.
Step 2: and identifying the amplitude and the coordinate value of each beat of pulse of the photoplethysmography, and performing interpolation processing on the amplitude and the coordinate value to obtain a respiratory waveform, wherein the respiratory waveform is a waveform representing the relationship between the amplitude and the coordinate value.
Specifically, the amplitude and position of each pulse of the photoplethysmography pulse wave are identified and marked as (x)0，y0),(x1,y1)…(xn,yn) X is coordinate value and y is amplitude. The height of the vertical line in fig. 2 represents the amplitude and the horizontal displacement represents the coordinate position. Selecting a natural boundary condition pair (x) using cubic spline interpolation0，y0),(x1,y1)…(xn,yn) Interpolation is performed to form a respiration waveform, as shown in fig. 3.
And step 3: a respiratory frequency is calculated based on the respiratory waveform. Specifically, F ═ F × n/(x) can be determinedn+i-xi) Calculating the respiratory frequency F, wherein F is the sampling frequency, which is 100 in this embodiment, xn+iIs the coordinate value, x, corresponding to the n + i th peak value in the respiratory waveformiAnd the coordinate value is the coordinate value corresponding to the ith peak value in the respiratory waveform.
As a preferred implementation manner of this embodiment, the photoplethysmography needs to be filtered between step 1 and step 2. Specifically, a band-pass filter with a cut-off frequency of 0.1-4.2Hz may be used to filter the photoplethysmographic pulse wave.
As a preferred implementation manner of this embodiment, in order to reduce the interference, autocorrelation processing may be performed on the respiration waveform between step 2 and step 3. The specific treatment method is as follows:
where m e [2000,3999], R represents the autocorrelation waveform data, y represents the original respiratory waveform data, and m, n represents a position or index in the waveform data. The resulting autocorrelation waveform is shown in fig. 4.
Example 2
Referring to fig. 5, the present embodiment provides a sign monitor comprising: a blood oxygen saturation sensor and a processor, wherein the processor comprises a respiratory rate calculation module, the respiratory rate calculation module comprising:
a photoplethysmography obtaining unit 501, configured to obtain a photoplethysmography acquired by the blood oxygen saturation sensor;
a respiratory waveform determining unit 502, configured to identify an amplitude and a coordinate value of each beat of the photoplethysmography pulse wave, and perform interpolation processing on the amplitude and the coordinate value to obtain a respiratory waveform, where the respiratory waveform is a waveform indicating a relationship between the amplitude and the coordinate value;
a respiratory rate calculating unit 503 for calculating a respiratory rate based on the respiratory waveform, specifically, according to F ═ F × n/(x)n+i-xi) Calculating the respiratory frequency F, wherein F is the sampling frequency, which is 100 in this embodiment, xn+iIs the coordinate value, x, corresponding to the n + i th peak value in the respiratory waveformiFor the seat corresponding to the ith peak in the respiration waveformAnd (5) carrying out value marking.
As a preferred implementation manner of this embodiment, the respiratory rate calculation module further includes:
and the photoelectric volume pulse wave filtering unit is used for filtering the photoelectric volume pulse wave. Specifically, a band-pass filter with a cut-off frequency of 0.1-4.2Hz can be used for filtering the photoplethysmographic pulse wave.
As a preferred implementation manner of this embodiment, the respiratory rate calculation module further includes:
and the autocorrelation processing unit is used for carrying out autocorrelation processing on the respiratory waveform.
In this embodiment, the physical sign monitor includes a blood oxygen analog front end, which is a chip for measuring blood oxygen saturation, and is used to drive the on-off timing and the light intensity of the red light and the infrared light in the blood oxygen saturation sensor, and convert the blood volume change signal into a digital signal. After the processor receives the digital signal, the respiratory frequency calculation module calculates the respiratory frequency according to the digital signal, and the screen displays the calculated respiratory frequency. In this embodiment, the blood oxygen saturation sensor is in a model of TJS2011J9, the blood oxygen simulation front end is in a model of AFE4490, the processor adopts a single chip microcomputer in a model of STM32H743, and the screen signal is KD 035C-4-CTP-005.
The respiratory frequency measuring method and the physical sign monitor provided by the invention obtain respiratory waves based on the photoplethysmogram acquired by the blood oxygen saturation sensor. Compared with the method for measuring the respiratory frequency by using the chest impedance and the respiratory airflow method in the prior art, the method for measuring the respiratory frequency of the physical sign monitor does not need to add a part on the conventional physical sign monitor, not only increases the respiratory frequency measurement function of the physical sign monitor, but also ensures the convenience of the physical sign monitor, and realizes respiratory monitoring without increasing the cost.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A respiratory rate measurement method, characterized by comprising:
step 1: acquiring a photoplethysmogram acquired by a blood oxygen saturation sensor;
step 2: identifying the amplitude and the coordinate value of each beat of pulse of the photoplethysmography, and carrying out interpolation processing on the amplitude and the coordinate value to obtain a respiratory waveform, wherein the respiratory waveform is a waveform representing the relationship between the amplitude and the coordinate value;
and step 3: a respiratory frequency is calculated based on the respiratory waveform.
2. The respiratory rate measurement method according to claim 1, further comprising, between step 1 and step 2:
filtering the photoplethysmographic pulse wave.
3. The method for measuring respiratory rate according to claim 2, wherein the filtering the photoplethysmographic pulse wave specifically comprises:
and filtering the photoplethysmography by adopting a band-pass filter with the cut-off frequency of 0.1-4.2 Hz.
4. The respiratory rate measurement method according to claim 1, further comprising, between step 2 and step 3:
and performing autocorrelation processing on the respiration waveform.
5. The method for measuring respiratory rate according to claim 1, wherein step 3 specifically comprises:
according to F ═ F × n/(x)n+i-xi) Calculating a respiratory frequency F, wherein F is a sampling frequency xn+iIs the coordinate value, x, corresponding to the n + i th peak value in the respiratory waveformiAnd the coordinate value is the coordinate value corresponding to the ith peak value in the respiratory waveform.
6. A sign monitor, the sign monitor comprising: oxyhemoglobin saturation sensor and processor, characterized in that, the processor includes respiratory rate calculation module, respiratory rate calculation module includes:
the photoelectric volume pulse wave acquisition unit is used for acquiring the photoelectric volume pulse wave acquired by the blood oxygen saturation sensor;
the respiratory waveform determining unit is used for identifying the amplitude and the coordinate value of each beat of pulse of the photoplethysmography and carrying out interpolation processing on the amplitude and the coordinate value to obtain a respiratory waveform, wherein the respiratory waveform is a waveform representing the relationship between the amplitude and the coordinate value;
a respiratory frequency calculation unit for calculating a respiratory frequency based on the respiratory waveform.
7. The sign monitor of claim 6, wherein the respiratory rate calculation module further comprises:
and the photoelectric volume pulse wave filtering unit is used for filtering the photoelectric volume pulse wave.
8. The sign monitor of claim 7, wherein the photoplethysmography filtering unit comprises:
and the photoelectric volume pulse wave filtering subunit is used for filtering the photoelectric volume pulse wave by adopting a band-pass filter with the cut-off frequency of 0.1-4.2 Hz.
9. The sign monitor of claim 6, wherein the respiratory rate calculation module further comprises:
and the autocorrelation processing unit is used for carrying out autocorrelation processing on the respiratory waveform.
10. The sign monitor of claim 6, wherein the respiratory rate calculation unit comprises:
a respiratory rate calculation subunit for calculating a respiratory rate from F ═ F × n/(x)n+i-xi) Calculating a respiratory frequency F, wherein F is a sampling frequency xn+iIs the coordinate value, x, corresponding to the n + i th peak value in the respiratory waveformiAnd the coordinate value is the coordinate value corresponding to the ith peak value in the respiratory waveform.
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