CN110464318B - Physiological signal acquisition system based on PPG - Google Patents
Physiological signal acquisition system based on PPG Download PDFInfo
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- CN110464318B CN110464318B CN201910772407.9A CN201910772407A CN110464318B CN 110464318 B CN110464318 B CN 110464318B CN 201910772407 A CN201910772407 A CN 201910772407A CN 110464318 B CN110464318 B CN 110464318B
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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
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
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- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
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- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
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- A61B5/113—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing
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Abstract
The embodiment of the invention provides a physiological signal acquisition system based on PPG, which comprises: a signal acquisition device and at least one elastic restraint; the signal acquisition equipment comprises at least one PPG sensing unit, and the PPG sensing unit comprises a light emitting module and a light receiving and converting module; during measurement, the elastic restraint piece is sleeved on the measured body and elastically deforms along with the breathing process of the measured body; the PPG sensing unit is clamped on the elastic restraint piece, so that the elastic restraint piece is positioned between the light emitting module and the light receiving and converting module of the PPG sensing unit; along with the breathing process of the detected body, the light quantity passing through the elastic constraint piece changes, and the light receiving and converting module outputs a respiratory wave signal. According to the embodiment of the invention, the PPG sensing unit and the elastic restraint piece are combined, the elastic restraint piece generates elastic deformation along with the breathing of the detected body, and the output signal of the PPG sensing unit changes along with the elastic deformation, so that the respiratory wave signal is obtained, and the objective and accurate acquisition of the respiratory wave signal is realized.
Description
Technical Field
The invention relates to the technical field of signal acquisition, in particular to a physiological signal acquisition system based on PPG.
Background
The respiration detection is in a very important position in clinical application, can detect the respiration state of a patient in real time, and plays a vital role in judging the physiological condition of the patient by a doctor.
Most of the existing evaluations aiming at dyspnea are based on subjective evaluation of patients, such as BORG (Bilobar rating) and MMRC (MMRC), the dyspnea degree of the patients cannot be objectively and accurately reflected, the subjectivity is strong, and the evaluation is not suitable for the patients with poor understanding and incapability of accurately expressing self-feeling, especially the old.
Another method is that the chest belt with elasticity is worn on the position height of the connecting line of the two nipples, and the chest respiratory effort of the patient is monitored through the tension degree of the chest belt; after wearing for 1 day, the tension degree change information recorded by the chest strap is subjected to noise reduction processing. However, the information on the degree of change in the elastic tension is too small to be calculated accurately, and is easily disturbed.
Disclosure of Invention
In order to solve the problems in the prior art, an embodiment of the present invention provides a PPG-based physiological signal acquisition system, including: a signal acquisition device and at least one elastic restraint; the signal acquisition equipment comprises at least one PPG sensing unit, wherein the PPG sensing unit comprises a light emitting module and a light receiving and converting module; when the respiratory wave signal is measured, the elastic restraint piece is sleeved on the measured body and elastically deforms along with the breathing process of the measured body; the PPG sensing unit is clamped on the elastic restraint piece, so that the elastic restraint piece is positioned between the light emitting module and the light receiving and converting module of the PPG sensing unit; along with the breathing process of the detected body, the light quantity passing through the elastic restraint part changes, so that the light receiving and converting module of the PPG sensing unit outputs a respiratory wave signal.
Further, the PPG sensing unit is also used to independently measure pulse wave signals.
Further, the respiratory wave signal and the pulse wave signal are acquired simultaneously.
Furthermore, each PPG sensing unit is individually provided with an AD conversion module; and during measurement, the AD conversion modules adopt the same clock to acquire signals.
The system further comprises a processing unit, wherein the processing unit is used for preprocessing the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, performing combined analysis on the preprocessed respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, and obtaining a traditional Chinese medicine diagnosis result according to the result of the combined analysis; if the respiratory wave signals are more than one, the respiratory wave signals to be analyzed are statistical results of the respiratory wave signals; and if the number of the pulse wave signals is more than one, the pulse wave signals to be analyzed are the statistical results of the pulse wave signals.
Further, when the processing unit is configured to pre-process the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, the processing unit is specifically configured to: acquiring the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, wherein the abnormal signals are eliminated and the time of the respiratory wave signal to be analyzed and the time of the pulse wave signal to be analyzed are aligned; then, respectively carrying out normalization processing on the obtained respiratory wave signal to be analyzed and the pulse wave signal to be analyzed; sampling and discretizing the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed according to the same sampling frequency by using the same time axis; and finally, forming a combined matrix by sampling points of the dispersed respiratory wave signals to be analyzed and the pulse wave signals to be analyzed, and arranging according to sampling time points.
Further, when the processing unit is configured to perform joint analysis on the preprocessed respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, the processing unit is specifically configured to: and acquiring time domain information, frequency domain information and difference information of the joint matrix.
Further, the system also comprises an output unit, wherein the output unit is used for outputting the traditional Chinese medicine diagnosis result to a preset terminal device, connecting a display device to display the traditional Chinese medicine diagnosis result and connecting a printing device to print the traditional Chinese medicine diagnosis result.
Further, the processing unit and the output unit are integrated in the signal acquisition device or an upper computer.
According to the physiological signal acquisition system based on the PPG, provided by the embodiment of the invention, the PPG sensing unit and the elastic restraint piece are combined, the elastic restraint piece generates elastic deformation along with the breathing of the detected body, and the output signal of the PPG sensing unit changes along with the elastic deformation, so that a respiratory wave signal is obtained, and the objective and accurate acquisition of the respiratory wave signal is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural principle diagram of a PPG-based physiological signal acquisition system provided by an embodiment of the present invention;
fig. 2 is a schematic application diagram of a PPG-based physiological signal acquisition system provided by an embodiment of the present invention;
fig. 3 is a schematic application diagram of a PPG-based physiological signal acquisition system according to another embodiment of the present invention;
fig. 4 is a schematic diagram of an application of a PPG-based physiological signal acquisition system according to another embodiment of the present invention
Fig. 5 is a schematic diagram of a signal acquisition manner of a physiological signal acquisition system for PPG according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a signal acquisition manner of a PPG-based physiological signal acquisition system according to another embodiment of the present invention;
fig. 7 is a schematic diagram of a signal acquisition manner of a PPG-based physiological signal acquisition system according to another embodiment of the present invention;
fig. 8 is a schematic diagram of a signal acquisition manner of a PPG-based physiological signal acquisition system according to another embodiment of the present invention;
fig. 9 is a waveform diagram of a pulse wave signal and a respiratory wave signal obtained by a PPG-based physiological signal acquisition system provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Fig. 1 is a schematic structural principle diagram of a PPG-based physiological signal acquisition system provided by an embodiment of the present invention. Fig. 2 is an application schematic diagram of a PPG-based physiological signal acquisition system provided in an embodiment of the present invention. Fig. 3 is a schematic application diagram of a PPG-based physiological signal acquisition system according to another embodiment of the present invention. As shown in fig. 1, the system comprises a signal acquisition device and at least one elastic constraint 101; the signal acquisition equipment comprises at least one PPG sensing unit, wherein the PPG sensing unit comprises a light emitting module 2011 and a light receiving and converting module 2012; when a respiratory wave signal is measured, the elastic restraint part 101 (part of the structure is shown in the figure) is used for being sleeved on a tested body and elastically deforming along with the breathing process of the tested body; the PPG sensing unit is configured to be clamped on the elastic restraint 101, such that the elastic restraint 101 is located between the light emitting module 2011 and the light receiving and converting module 2012 of the PPG sensing unit; as the subject breathes, the amount of light passing through the elastic restraint member 101 changes, so that the light receiving and converting module 2012 of the PPG sensing unit outputs a respiratory wave signal.
In the embodiment of the invention, the PPG sensing unit can adopt the existing PPG pulse wave sensor.
When the respiratory wave signal is collected, the elastic restraint part 101 is used for being sleeved on a tested body and elastically deforming along with the breathing process of the tested body. The tested body is a human body or an animal body. The position of the elastic restraining element 101 should be such that the elastic restraining element 101 is elastically deformable, e.g. stretched and contracted, during breathing, such as the chest or abdomen of a human body (see fig. 2). The PPG sensing unit 201 includes a light emitting module 2011 and a light receiving and converting module 2012, and the PPG sensing unit 201 is clamped on the elastic restraint 101, so that the elastic restraint 101 is located between the light emitting module 2011 and the light receiving and converting module 2012. The elastic restraint 101 may be constructed of, but is not limited to, a translucent material such as a rubber band. As the subject breathes, the thickness of the elastic restraint member 101 between the light emitting module 2011 and the light receiving and converting module 2012 changes, and the amount of light passing through the elastic restraint member 101 changes, so that the light receiving and converting module 2012 outputs a respiratory wave signal reflecting the breathing fluctuation.
During measurement, the PPG sensing unit 201 is clamped on the elastic restraint part 101, and the elastic restraint part 101 is bound on the chest or waist of a human body and is tightly attached; the position of the clip does not need to be fixed, and the clip can be clipped at any position of the elastic restraint part 101; the material of the elastic restraint 101 is selected to meet the required characteristics of PPG measurement, and can be perforated by light, such as translucent material, which may be, but is not limited to, a rubber band; during measurement, the human body cannot move and keeps stable.
The principle for realizing respiratory wave signal measurement in the embodiment of the invention is as follows: along with the breathing process of a detected body, the elastic restraint part is stretched or contracted to deform, so that thickness change is generated, the light quantity of the light emitted by the light emitting module 2011 of the PPG sensing unit 201 and reaching the light receiving and converting module 2012 through the elastic restraint part 101 is changed, and the output waveform can reflect the thickness change condition.
According to the embodiment of the invention, the PPG sensing unit is combined with the elastic restraint piece, the elastic restraint piece generates elastic deformation along with the respiration of the detected body, and the output signal of the PPG sensing unit changes along with the elastic deformation, so that the respiratory wave signal is obtained, and the objective and accurate acquisition of the respiratory wave signal is realized.
Further, based on the above embodiment, the PPG sensing unit 201 is also used to independently measure pulse wave signals.
According to actual needs, the PPG-based physiological signal acquisition system provided by the embodiment of the present invention can measure pulse waves alone or respiratory waves alone. As shown in fig. 3, since the PPG sensing unit itself can measure the pulse wave, the PPG sensing unit 201 can be clamped at the measured position, such as a finger, so as to measure the finger volume pulse wave signal. In addition, as shown in fig. 4, the PPG sensing unit 201 can be clamped on the elastic restraint member sleeved at the measured position, so as to measure the respiratory wave signal, and thus, the signal acquisition of the dual-mode wave can be realized by using one sensor.
Fig. 5 is a schematic diagram of a signal acquisition manner of a physiological signal acquisition system for PPG according to another embodiment of the present invention. As shown in fig. 5, the PPG-based physiological signal acquisition system provided in the embodiment of the present invention can measure pulse wave signals and respiratory wave signals by using one channel, so as to realize dual-mode wave signal acquisition by using one acquisition channel. While the conventional dual mode requires at least two channels for respective measurement, the embodiment of the present invention can realize the acquisition of dual mode waves by using one channel.
As can be seen from the above, in the embodiment of the present invention, the PPG sensing unit 201 and the elastic restraint 101 may be combined to measure the respiratory wave signal, and the PPG sensing unit 201 may be used alone to measure the pulse wave signal. The number of PPG sensing units 201 and elastic restraints 101 may be set as desired, depending on the different pathways that need to be measured simultaneously.
It should be noted that the structures of the PPG sensing unit and the elastic constraining member shown in fig. 1 to 4 are only schematic, and the structures may be changed as long as the functions provided by the embodiments of the present invention can be implemented. Moreover, the PPG sensing unit 201 may employ an existing PPG photoplethysmography sensor.
According to the embodiment of the invention, the PPG sensing unit is combined with the elastic restraint piece, the elastic restraint piece generates elastic deformation along with the breathing of the detected body, and the output signal of the PPG sensing unit changes along with the elastic deformation, so that a respiratory wave signal is obtained, and the objective and accurate acquisition of the respiratory signal is realized; meanwhile, the PPG sensing unit can measure pulse waves, and the signal acquisition of respiratory waves and pulse wave dual-mode waves by utilizing one sensor channel is realized.
Further, based on the above embodiment, the respiratory wave signal and the pulse wave signal are acquired simultaneously.
The respiratory wave signal and the pulse wave signal are acquired simultaneously. The respiratory wave signal and the pulse wave signal can be set to be multipath. Since the PPG sensing unit 201 itself can measure the pulse wave signal, and the PPG sensing unit 201 and the elastic constraint member 101 can measure the respiratory wave signal together, the number of the PPG sensing units 201 and the number of the elastic constraint members 101 included in the physiological signal acquisition system based on the PPG can be set according to the number of paths of the respiratory wave signal and the pulse signal that need to be measured simultaneously.
The same sensor can be adopted by each PPG sensing unit, so that the acquisition of multiple paths of dual-mode waves can be realized by using one type of sensor.
Fig. 6 to 8 are schematic diagrams of signal acquisition manners of a PPG-based physiological signal acquisition system according to another embodiment of the present invention. The physiological signal acquisition system based on PPG provided by the embodiment of the invention can realize the simultaneous acquisition of respiratory wave signals and pulse wave signals. As shown in fig. 6, one channel is used to measure pulse wave signals, and one channel is used to measure respiratory signals; as shown in fig. 7, two channels measure pulse wave signals, and then one channel respiration signal is added; as shown in fig. 8, two channels measure pulse wave signals and the other two channels measure respiratory signals.
On the basis of the embodiment, the embodiment of the invention realizes more comprehensive acquisition of human physiological signals at the same time by simultaneously acquiring respiratory wave signals and pulse wave signals.
Further, based on the above embodiment, each PPG sensing unit is separately provided with an AD conversion module; and during measurement, the AD conversion modules adopt the same clock to acquire signals.
The simultaneous acquisition of each signal path will generate a time difference. The analysis of the acquired respiratory wave signals and pulse wave signals requires signal synchronization. In the embodiment of the invention, each PPG sensing unit is independently provided with an AD conversion module, and during measurement, each AD conversion module adopts the same clock to acquire signals, so that signal synchronization is realized.
On the basis of the above embodiments, in the embodiments of the present invention, an AD conversion module is separately provided for each PPG sensing unit; during measurement, the AD conversion modules adopt the same clock to acquire signals, and synchronization of signal acquisition is realized.
Further, based on the above embodiment, the system further includes a processing unit, where the processing unit is configured to pre-process the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, perform joint analysis on the pre-processed respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, and obtain a diagnosis result of the traditional Chinese medicine according to a result of the joint analysis; if the respiratory wave signals are more than one, the respiratory wave signals to be analyzed are statistical results of the respiratory wave signals; and if the number of the pulse wave signals is more than one, the pulse wave signals to be analyzed are the statistical results of the pulse wave signals.
The physiological signal acquisition system based on the PPG provided by the embodiment of the invention can acquire the respiratory and pulse dual-mode signals simultaneously. The system further comprises a processing unit, wherein the processing unit is used for preprocessing the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, performing combined analysis on the preprocessed respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, and obtaining a traditional Chinese medicine diagnosis result according to the result of the combined analysis.
According to the different set of the acquisition channels or the different acquisition results, the respiratory wave signal to be analyzed can be the one-path respiratory wave signal or a signal obtained by performing statistical processing on two or more paths of respiratory wave signals, such as a signal obtained by averaging. The pulse wave signal may be the one-path pulse wave signal, or may be a signal obtained by performing statistical processing on two or more paths of pulse wave signals, such as a signal obtained by weighted averaging. The processing modes of the respiratory wave signal to be analyzed and the respiratory wave signal to be analyzed can be the same or different.
Fig. 9 is a waveform diagram of a pulse wave signal and a respiratory wave signal obtained by a PPG-based physiological signal acquisition system provided by an embodiment of the present invention. Wherein, the bigger amplitude is respiratory wave signal, and the smaller amplitude is pulse wave signal.
On the basis of the above embodiment, the embodiment of the invention processes the dual-mode signal formed by the obtained respiratory wave signal and pulse wave signal, so as to obtain the diagnosis result of the traditional Chinese medicine, thereby improving the practicability.
Further, based on the above embodiment, when the processing unit is configured to pre-process the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, the processing unit is specifically configured to: acquiring the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, wherein the abnormal signals are eliminated and the time of the respiratory wave signal to be analyzed and the time of the pulse wave signal to be analyzed are aligned; then, respectively carrying out normalization processing on the obtained respiratory wave signal to be analyzed and the pulse wave signal to be analyzed; sampling and discretizing the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed according to the same sampling frequency by using the same time axis; and finally, forming a combined matrix by sampling points of the dispersed respiratory wave signals to be analyzed and the pulse wave signals to be analyzed, and arranging according to sampling time points.
When the processing unit is used for preprocessing the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, an abnormal waveform is generated due to the possibility of interference in the signal acquisition process, and the abnormal waveform needs to be removed in the subsequent analysis. Therefore, the processing unit firstly performs abnormality judgment on the synchronized respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, cuts the waveform of each rhythm, judges whether the waveform is abnormal or not, if the waveform is abnormal, eliminates the waveform, and sets the original waveform part to zero or sets a corresponding mark and label, and if the waveform is normal, keeps the waveform. And after the abnormity is judged and processed, extracting the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed which have normal waveforms and are aligned in time for further processing.
After the pulse wave signal p (t) to be analyzed and the respiratory wave signal v (t) to be analyzed are synchronized and abnormal waveforms are removed, the dual-mode signal joint analysis is carried out. Respectively carrying out normalization processing on the obtained respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, acquiring a maximum value and a minimum value of the respiratory wave signal to be analyzed, and normalizing the maximum value and the minimum value to be between 0 and 1, such as P (t); the pulse wave signal to be analyzed acquires its maximum and minimum values, also normalized to between 0 and 1, as denoted by v (t). Sampling the two signals according to the same sampling frequency by using the same time axis, and discretizing; the discretized sampling points form a combined matrix; arranging according to sampling time points; a union matrix U is obtained.
On the basis of the above embodiment, the embodiment of the invention preprocesses the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed by constructing a joint matrix and the like, thereby improving the accuracy of the analysis result.
Further, based on the above embodiment, when the processing unit is configured to perform joint analysis on the preprocessed respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, the processing unit is specifically configured to: and acquiring time domain information, frequency domain information and difference information of the joint matrix.
When the processing unit is used for performing joint analysis on the preprocessed respiratory wave signal to be analyzed and the preprocessed pulse wave signal to be analyzed, the processing unit is specifically used for: and acquiring time domain information, frequency domain information and difference information of the joint matrix U. The time domain information comprises a mean value, a variance, a standard deviation and the like; the frequency domain information comprises energy, spectral distribution and the like; the difference information includes a first derivative of rhythm, a second derivative of rhythm, etc. The processing unit further obtains a diagnosis result of the traditional Chinese medicine according to the result of the joint analysis.
On the basis of the above embodiment, the embodiment of the invention performs joint analysis on the preprocessed respiratory wave signal and pulse wave signal by acquiring the time domain information, the frequency domain information and the difference information of the joint matrix, thereby further improving the accuracy of the analysis result.
Further, based on the above embodiment, the system further includes an output unit, where the output unit is configured to output the diagnosis result of the chinese medical science to a preset terminal device, connect a display device to display the diagnosis result of the chinese medical science, and connect a printing device to print the diagnosis result of the chinese medical science.
The system also comprises an output unit, wherein the output unit is used for sending the traditional Chinese medicine diagnosis result to preset terminal equipment, and the terminal equipment is a mobile phone of a user so as to output the traditional Chinese medicine diagnosis result and facilitate the user to check. The output unit can output and display or print the traditional Chinese medicine diagnosis result in a wired/wireless mode. The system can be connected with display equipment through the output unit, and the traditional Chinese medicine diagnosis result is output to the display equipment to be displayed; the output unit can be connected with a printer, and the traditional Chinese medicine diagnosis result is output to the printer for printing.
The processing unit and the output unit may be integrated in the signal acquisition device or in an upper computer. The signal acquisition equipment can work independently and output intelligent diagnosis results to the outside; the signal acquisition equipment can also be connected with other upper computers, the acquired signals are transmitted to the upper computers through wired transmission or wireless transmission modules for intelligent diagnosis, and the intelligent diagnosis results are output by the upper computers.
On the basis of the embodiment, the embodiment of the invention improves the practicability and convenience by outputting the traditional Chinese medicine diagnosis result to the preset terminal equipment, connecting the display equipment to display the traditional Chinese medicine diagnosis result and connecting the printing equipment to print the traditional Chinese medicine diagnosis result.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A PPG-based physiological signal acquisition system, comprising: a signal acquisition device and at least one elastic restraint; the signal acquisition equipment comprises at least one PPG sensing unit, wherein the PPG sensing unit comprises a light emitting module and a light receiving and converting module;
when the respiratory wave signal is measured, the elastic restraint piece is sleeved on the measured body and elastically deforms along with the breathing process of the measured body; the PPG sensing unit is clamped on the elastic restraint piece, so that the elastic restraint piece is positioned between the light emitting module and the light receiving and converting module of the PPG sensing unit; with the breathing process of a detected body, the thickness of the elastic restraint part changes, and the light quantity passing through the elastic restraint part changes, so that the light receiving and converting module of the PPG sensing unit outputs a respiratory wave signal; wherein the material of the elastic restraint comprises a translucent material.
2. The PPG-based physiological signal acquisition system of claim 1 wherein the PPG sensing unit is further configured to independently measure pulse wave signals.
3. The PPG-based physiological signal acquisition system of claim 2 wherein the respiratory wave signal and the pulse wave signal are acquired simultaneously.
4. The PPG-based physiological signal acquisition system according to claim 3, wherein each PPG sensing unit is separately provided with an AD conversion module; and during measurement, the AD conversion modules adopt the same clock to acquire signals.
5. The PPG-based physiological signal acquisition system according to claim 4, further comprising a processing unit, wherein the processing unit is configured to pre-process the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, perform joint analysis on the pre-processed respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, and obtain a diagnosis result of traditional Chinese medicine according to a result of the joint analysis;
if the respiratory wave signals are more than one, the respiratory wave signals to be analyzed are statistical results of the respiratory wave signals; and if the number of the pulse wave signals is more than one, the pulse wave signals to be analyzed are the statistical results of the pulse wave signals.
6. The PPG-based physiological signal acquisition system of claim 5, wherein the processing unit, when being configured to pre-process the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, is specifically configured to: acquiring the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, wherein the abnormal signals are eliminated and the time of the respiratory wave signal to be analyzed and the time of the pulse wave signal to be analyzed are aligned; then, respectively carrying out normalization processing on the obtained respiratory wave signal to be analyzed and the pulse wave signal to be analyzed; sampling and discretizing the respiratory wave signal to be analyzed and the pulse wave signal to be analyzed according to the same sampling frequency by using the same time axis; and finally, forming a combined matrix by sampling points of the dispersed respiratory wave signals to be analyzed and the pulse wave signals to be analyzed, and arranging according to sampling time points.
7. The PPG-based physiological signal acquisition system of claim 6, wherein the processing unit, when being configured to jointly analyze the preprocessed respiratory wave signal to be analyzed and the pulse wave signal to be analyzed, is specifically configured to: and acquiring time domain information, frequency domain information and difference information of the joint matrix.
8. The physiological signal acquisition system according to claim 5, further comprising an output unit, wherein the output unit is used for outputting the diagnosis result of the TCM to a preset terminal device, connecting a display device to display the diagnosis result of the TCM, and connecting a printing device to print the diagnosis result of the TCM.
9. The PPG-based physiological signal acquisition system of claim 8 wherein the processing unit and the output unit are integrated with the signal acquisition device or with a host computer.
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| JPH01207037A (en) * | 1988-02-15 | 1989-08-21 | Matsushita Electric Works Ltd | Photoelectric conversion type respiration sensor |
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