CN118319281A - Heart displacement detection system - Google Patents
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- CN118319281A CN118319281A CN202410757754.5A CN202410757754A CN118319281A CN 118319281 A CN118319281 A CN 118319281A CN 202410757754 A CN202410757754 A CN 202410757754A CN 118319281 A CN118319281 A CN 118319281A
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- 238000001514 detection method Methods 0.000 title claims abstract description 113
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 63
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 21
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- 230000005284 excitation Effects 0.000 claims abstract description 19
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims description 60
- 239000003990 capacitor Substances 0.000 claims description 42
- 230000004069 differentiation Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 230000000747 cardiac effect Effects 0.000 description 30
- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 238000012549 training Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000000638 stimulation Effects 0.000 description 5
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- 238000003062 neural network model Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000004217 heart function Effects 0.000 description 2
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- 230000000004 hemodynamic effect Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The embodiment of the application provides a heart displacement detection system, which relates to the technical field of medical appliances, and comprises an excitation signal generation unit, an impedance signal detection unit and a heart displacement detection unit; the signal generator is used for generating a first signal with preset frequency, performing voltage baseline adjustment on the first signal to obtain a second signal, and inputting the second signal into the signal output device; the signal output device is used for adjusting the amplitude of the second signal and applying the adjusted second signal to the target object through the first lead wire according to a preset period; the impedance signal detection unit is used for acquiring a response signal of the target object through the second lead wire, filtering interference signals in the response signal and obtaining an impedance signal; and the heart displacement detection unit is used for estimating the heart displacement of the target object based on the impedance signal. By applying the scheme provided by the embodiment, the heart displacement of the target object can be detected noninvasively and accurately.
Description
Technical Field
The application relates to the technical field of medical equipment, in particular to a heart displacement detection system.
Background
The heart displacement is an important parameter index reflecting the heart function of a patient, knows the pumping function of the heart, calculates related hemodynamic indexes, and guides clinical treatment, and has important value in monitoring the heart function of critical patients and heart patients. The detection mode of the heart displacement is gradually changed from an invasive mode and a minimally invasive mode to a non-invasive mode, and how to realize non-invasive and accurate detection of the heart displacement is a problem to be solved.
Disclosure of Invention
It is an aim of embodiments of the present application to provide a cardiac output detection system to enable noninvasive and accurate detection of cardiac output. The specific technical scheme is as follows:
In a first aspect, an embodiment of the present application provides a cardiac output detection system, the system including an excitation signal generating unit, an impedance signal detecting unit, and a cardiac output detecting unit, the excitation signal generating unit including a signal generator and a signal output; wherein:
The signal generator is used for generating a first signal with preset frequency, adjusting a voltage baseline of the first signal so that the voltage baseline of the first signal is set at a preset value to obtain a second signal, and inputting the second signal into the signal output device;
The signal output device is used for adjusting the amplitude of the second signal so that the adjusted amplitude is smaller than a preset threshold value, and applying the adjusted second signal to a target object according to a preset period through the first lead wire;
The impedance signal detection unit is used for acquiring a response signal of the target object through a second lead wire, filtering interference signals in the response signal to obtain an impedance signal, and inputting the obtained impedance signal into the heart displacement detection unit;
The heart displacement detection unit is used for estimating the heart displacement of the target object based on the impedance signal.
In one embodiment of the present application, the signal generator includes a voltage adjustment circuit, and the voltage adjustment circuit performs voltage adjustment on the first signal to obtain a second signal; wherein the voltage adjustment circuit includes: the first capacitor C1, the second capacitor C2, the first resistor R1, the second resistor R2, the first analog operational amplifier OP1, the third resistor R3, the fourth resistor R4, the third capacitor C3, the fourth capacitor C4 and the second analog operational amplifier OP2;
one end of the first capacitor C1 is used for inputting the first signal, and the other end of the first capacitor C1 is connected with the second capacitor C2 and the first resistor R1 respectively; the other end of the first resistor R1 is respectively connected with the negative input end and the output end of the first analog operational amplifier OP 1;
the other end of the second capacitor C2 is respectively connected with the positive input end of the first analog operational amplifier OP1 and one end of the second resistor R2; the other end of the second resistor R2 is grounded; the output end of the first analog operational amplifier OP1 is also connected with one end of the third resistor R3;
the other end of the third resistor R3 is respectively connected with one end of the fourth resistor R4 and one end of the third capacitor C3; the other end of the third capacitor C3 is respectively connected with the negative input end and the output end of the second analog operational amplifier OP 2;
The other end of the fourth resistor R4 is respectively connected with one end of the fourth capacitor C4 and the positive input end of the second analog operational amplifier OP 2; the other end of the fourth capacitor C4 is grounded; and the output end of the second analog operational amplifier OP2 is used for outputting the second signal.
In one embodiment of the present application, the system further includes a signal calibration unit, where the signal calibration unit is connected in parallel with the excitation signal generating unit and the impedance signal detecting unit, and the signal calibration unit is configured to perform signal error calibration on a signal acquired by the impedance signal detecting unit from the target object.
In one embodiment of the present application, the signal calibration unit includes a first data selector F1, a second data selector F2, and a calibration resistor R5; wherein:
one end of the first data selector F1 is connected with the excitation signal generation unit, and the other end of the first data selector F1 is connected with the target object; one end of the second data selector F2 is connected with the impedance signal detection unit, and the other end of the second data selector F2 is connected with the target object;
The calibration resistor R5 is connected in parallel to the first data selector F1 and the second data selector F2.
In one embodiment of the present application, the impedance signal impedance detection unit includes a common mode filter, a first signal amplifier, and an envelope detector; wherein:
The common mode filter is used for filtering common mode interference signals in the response signals, determining the filtered signals as first impedance signals and inputting the first impedance signals into the amplifier;
The first signal amplifier is configured to amplify the first impedance signal, determine the amplified impedance signal as a second impedance signal, and input the second impedance signal into the envelope detector;
the envelope detector is configured to perform envelope detection on the second impedance signal, determine a signal after envelope detection as an impedance signal, and output the impedance signal.
In one embodiment of the present application, the system further includes an impedance change signal detection unit; wherein:
the impedance change signal detection unit is used for acquiring an impedance signal output by the impedance signal detection unit, processing the impedance signal to obtain an impedance change signal representing the change condition of the impedance signal, and inputting the impedance change signal into the heart displacement detection unit;
The heart displacement detection unit is specifically configured to estimate heart displacement of the target object based on the impedance signal and the impedance variation signal.
In one embodiment of the present application, the impedance change signal detection unit includes a high-pass filter, a second signal amplifier, and a first low-pass filter, wherein:
the high-pass filter is used for filtering direct current components in the impedance signals and inputting the filtered impedance signals into the second signal amplifier;
The second signal amplifier is used for amplifying the filtered impedance signal to obtain an initial impedance change signal, and inputting the initial impedance change signal into the first low-pass filter;
The first low-pass filter is used for filtering high-frequency components in the initial impedance change signal to obtain a final impedance change signal, and outputting the impedance change signal.
In one embodiment of the present application, the system further includes an impedance differential signal detection unit; wherein:
The impedance differential signal detection unit is used for acquiring the impedance change signal output by the impedance change signal detection unit, processing the impedance change signal to obtain a differential signal of the impedance change signal, and inputting the differential signal into the heart displacement detection unit;
The heart displacement detection unit is specifically configured to estimate heart displacement of the target object based on the impedance signal, the impedance variation signal, and the differential signal.
In one embodiment of the present application, the impedance differential signal detection unit includes a signal differentiator, a second low pass filter, wherein:
the signal differentiator is used for acquiring the impedance change signal, differentiating the impedance change signal to obtain an initial impedance differentiation signal, and inputting the initial impedance differentiation signal into the second low-pass filter;
The second low-pass filter is used for filtering high-frequency components in the initial impedance differential signal to obtain a final impedance differential signal, and outputting the impedance differential signal.
From the above, by applying the scheme provided by the embodiment of the application, as the first signal is applied to the target object through the first lead wire, the second object is obtained through the second lead wire, and the first lead wire and the second lead wire act on the target object, namely, signal stimulation/acquisition is performed in a non-invasive manner; the impedance signal is obtained by filtering the response signal by interference signals, the impedance signal can accurately reflect the impedance information of the target object, and the heart displacement of the target object can be accurately detected based on the impedance information. Therefore, the scheme provided by the embodiment realizes noninvasive and accurate detection of the heart displacement.
In addition, since the amplitude of the second signal acting on the target object is smaller than the preset amplitude, when the second signal acts on the target object, the target object is stimulated with lower current, the damage of the continuous stimulation signal to the target object is reduced to the greatest extent, and the second signal is applied to the target object with a preset period, so that the damage to the target object is further reduced. Therefore, the scheme provided by the embodiment also reduces the risk of damage to the target object.
Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and other embodiments may be obtained according to these drawings to those skilled in the art.
FIG. 1 is a schematic diagram of a first system for detecting cardiac output according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a voltage adjusting circuit according to an embodiment of the present application;
FIG. 3a is a schematic diagram of a second embodiment of a cardiac output detection system according to the present application;
Fig. 3b is a schematic structural diagram of a signal calibration unit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a third embodiment of a cardiac output detection system according to the present application;
Fig. 5 is a schematic structural diagram of a fourth cardiac output detection system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art based on the present application are included in the scope of protection of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first cardiac output detection system according to an embodiment of the present application, where the system includes an excitation signal generating unit 101, an impedance signal detecting unit 102, and a cardiac output detecting unit 103.
The excitation signal generation unit 101 includes a signal generator 1011 and a signal output 1012. Wherein:
The signal generator 1011 is configured to generate a first signal with a preset frequency, perform voltage baseline adjustment on the first signal, set the voltage baseline of the first signal at a preset value, obtain a second signal, and input the second signal into the signal output device.
The preset frequency is preset, for example, the preset frequency can be any frequency value of 20KHz-100KHz, such as 20KHz, 30KHz, 40KHz, 50KHz, 60KHz, … …, 100KHz, etc.
The preset value is preset. The preset value can be 0V, when the preset value is 0V, the reference voltage of the first signal can be 0V, the damage to the target object is reduced to the minimum, and the signal carrier function is not affected.
And a signal output unit 1012 for adjusting the amplitude of the second signal so that the adjusted amplitude is smaller than a preset threshold value, and applying the adjusted second signal to the target object through the first lead wire according to a preset period.
The target object may be a human body, an animal body, or the like.
The second signal is applied to a specific portion of the target object, so that the specific portion generates a corresponding response signal to the second signal, and impedance information of the specific portion can be detected. The second signal may also be referred to as an excitation signal.
The amplitude of the second signal is smaller than a preset threshold value. The preset threshold is preset, and the amplitude of the signal with the minimum loss to the target object can be determined in advance in the test environment and used as the preset threshold. The preset threshold value may be any one of 1mA to 4 mA.
Because the amplitude of the second signal is smaller than the preset threshold value, when the second signal acts on the target object, the target object is stimulated by lower current, and the damage of the sustainable stimulation signal to the target object tissue is reduced to the greatest extent.
The first lead line acts on the target object, such as on the aortic position near the anterior triangle on the left side of the neck of the target object. The number of the first lead wires may be one or a plurality of, such as two, etc. The first lead wire may be a shielding lead wire for shielding external environment interference.
When the first lead wires are two, one lead wire is used for transmitting signals, and the other lead wire is a ground wire.
The first lead wire can be connected with an antistatic surge circuit in parallel to inhibit the influence of external static electricity and surge on signals and interfere the normal operation of the system.
The preset period is preset, and may be 5s, 10s, 20s, etc.
The impedance signal detection unit 102 is configured to obtain a response signal of the target object through the second lead line, filter an interference signal in the response signal, obtain an impedance signal, and input the obtained biological impedance signal into the cardiac output detection unit.
The second lead wire acts on the target object, the position of the second lead wire corresponds to the position of the first lead wire, if the first lead wire acts on the front triangle of the left side of the neck of the target object, the second lead wire correspondingly acts on the right side of the xiphoid process of the target object and the lower two transverse fingers. The number of the second lead wires may be one or a plurality of, such as two. The second lead wire may be a shielding lead wire for shielding external environment interference.
The second lead wire can be connected with an antistatic surge circuit in parallel to inhibit the influence of external static electricity and surge on signals and interfere the normal operation of the system.
The response signal includes an interference signal such as an electrocardiograph signal and a motion signal in addition to the impedance signal, and therefore, it is necessary to filter the interference signal in the response signal to obtain the impedance signal.
In the extracting of the impedance signal, in one embodiment, the interference signal may be filtered by a preset signal filtering algorithm based on the time-domain correlation of the signal. Other ways of extracting the impedance signal may be found in the subsequent embodiments and will not be described in detail here.
And a heart displacement detection unit 103 for estimating the heart displacement of the target object based on the impedance signal.
In estimating the cardiac output, in one embodiment, signal features of the impedance signal may be extracted, and the cardiac output corresponding to the extracted signal features may be determined based on a correspondence between pre-constructed signal features and cardiac output. In another embodiment, the impedance signal may be input into a first heart displacement detection model constructed in advance, to obtain the heart displacement output by the first heart displacement detection model, where the first heart displacement detection model may be a model that is obtained by training a first initial neural network model by using a large number of sample impedance signals as training samples and using the actual heart displacement of the sample object as a training reference in advance, and is used for estimating the heart displacement.
From the above, by applying the scheme provided by the embodiment, since the first signal is applied to the target object through the first lead wire, the second object is obtained through the second lead wire, and the first lead wire and the second lead wire both act on the target object, that is, signal stimulation/acquisition is performed in a non-invasive manner; the impedance signal is obtained by filtering the response signal by interference signals, the impedance signal can accurately reflect the impedance information of the target object, and the heart displacement of the target object can be accurately detected based on the impedance information. Therefore, the scheme provided by the embodiment realizes noninvasive and accurate detection of the heart displacement.
In addition, since the amplitude of the second signal acting on the target object is smaller than the preset amplitude, when the second signal acts on the target object, the target object is stimulated with lower current, the damage of the continuous stimulation signal to the target object is reduced to the greatest extent, and the second signal is applied to the target object with a preset period, so that the damage to the target object is further reduced. Therefore, the scheme provided by the embodiment also reduces the risk of damage to the target object.
The foregoing embodiment corresponding to fig. 1 relates to a signal generator, where the signal generator includes a voltage adjustment circuit, and the voltage adjustment circuit performs voltage adjustment on the first signal to obtain the second signal. The configuration of the voltage adjustment circuit will be described below. Based on this, referring to fig. 2, fig. 2 is a schematic structural diagram of a voltage adjusting circuit according to an embodiment of the application.
The voltage adjustment circuit includes: the first capacitor C1, the second capacitor C2, the first resistor R1, the second resistor R2, the first analog operational amplifier OP1, the third resistor R3, the fourth resistor R4, the third capacitor C3, the fourth capacitor C4 and the second analog operational amplifier OP2; wherein:
The resistance of the first resistor R1 is equal to that of the second resistor R2, and the resistance of the resistors R1 and R2 can be 20k omega-25 k omega.
The capacitance value of the first capacitor C1 is equal to that of the second capacitor C2, and the capacitance values of the first capacitor C1 and the second capacitor C2 can be between 95nF and 105 nF.
The resistance of the third resistor R3 is equal to that of the fourth resistor R4, and the resistance of the R3 and the R4 can be 500 omega-520 omega.
The third capacitor C3 may have a capacitance value between 195pF and 205pF and the fourth capacitor C4 may have a capacitance value between 95pF and 105 pF.
One end of the first capacitor C1 is used for inputting a first signal, and the other end of the first capacitor C1 is connected with the second capacitor C2 and the first resistor R1 respectively; the other end of the first resistor R1 is respectively connected with the negative input end and the output end of the first analog operational amplifier OP 1;
The other end of the second capacitor C2 is respectively connected with the positive input end of the first analog operational amplifier OP1 and one end of the second resistor R2; the other end of the second resistor R2 is grounded; the output end of the first analog operational amplifier OP1 is also connected with one end of a third resistor R3;
The other end of the third resistor R3 is respectively connected with one end of the fourth resistor R4 and one end of the third capacitor C3; the other end of the third capacitor C3 is respectively connected with the negative input end and the output end of the second analog operational amplifier OP 2;
The other end of the fourth resistor R4 is respectively connected with one end of the fourth capacitor C4 and the positive input end of the second analog operational amplifier OP 2; the other end of the fourth capacitor C4 is grounded; the second analog operational amplifier OP2 output end is used for outputting a second signal.
In this embodiment, after the first signal passes through the circuit corresponding to the first analog OP1, the dc component in the first signal may be filtered out; and filtering clutter components in the direct current components after passing through a circuit corresponding to the second analog operational amplifier OP2, and adjusting a voltage baseline and filtering the clutter components without gain by using a second signal output by the two combined circuits.
In the foregoing embodiment corresponding to fig. 1, the cardiac output detection system may further include a signal calibration unit, based on which, referring to fig. 3a, fig. 3a is a schematic structural diagram of a second cardiac output detection system according to an embodiment of the present application, where the system includes a signal calibration unit 304 in addition to the excitation signal generation unit, the impedance signal detection unit, and the cardiac output detection unit in fig. 1.
The signal calibration unit 304 is connected in parallel with the excitation signal generation unit 301 and the impedance signal detection unit 302.
The signal calibration unit 304 is configured to perform signal error calibration on a signal acquired from the target object by the impedance signal detection unit.
Because the signal error calibration is carried out on the signal, the signal acquired by the impedance signal detection unit from the target object is more accurate, and the accuracy of heart displacement detection is improved.
Referring to fig. 3b, fig. 3b is a schematic structural diagram of a signal calibration unit according to an embodiment of the present application, where the signal calibration unit includes a first data selector F1, a second data selector F2, and a calibration resistor R5; wherein:
One end of the first data selector F1 is connected to the excitation signal generation unit, and the other end is connected to the target object.
One end of the second data selector F2 is connected to the impedance signal detection unit, and the other end is connected to the target object.
The calibration resistor R5 is connected in parallel to the first data selector F1 and the second data selector F2.
Specifically, the output signal of the excitation signal generating unit may be applied to the calibration resistor R5 through the first data selector, collect the signal of the target object through the second data selector, obtain the impedance deviation value of the collected signal based on the resistance value of the calibration resistor R5, and calibrate the impedance deviation value of the signal.
In the foregoing embodiment, an impedance signal detection unit is related to an embodiment of the present application, and the impedance signal detection unit includes a common mode filter, a first signal amplifier, and an envelope detector; wherein:
and the common mode filter is used for filtering common mode interference signals in the response signals, determining the filtered signals as first impedance signals and inputting the first impedance signals into the amplifier.
The common mode interference signals comprise electrocardiosignals, motion signals and the like. The common mode filter can be a common mode choke inductor and is used for filtering common mode interference signals.
And the first signal amplifier is used for amplifying the first impedance signal, determining the amplified impedance signal as a second impedance signal and inputting the second impedance signal into the envelope detector.
The first signal amplifier may amplify the first impedance signal by a predetermined factor, such as 10. The first signal amplifier may be an instrumentation amplifier.
And the envelope detector is used for carrying out envelope detection on the second impedance signal, determining the signal subjected to envelope detection as an impedance signal and outputting the impedance signal.
In one embodiment of the present application, the cardiac output detection system may further include an impedance change signal detection unit, based on which, in one embodiment of the present application, referring to fig. 4, fig. 4 is a schematic structural diagram of a third cardiac output detection system provided in an embodiment of the present application, where the system further includes an impedance change signal detection unit 404 in addition to the excitation signal generation unit, the impedance signal detection unit, and the cardiac output detection unit.
The excitation signal generation unit 401 includes a signal generator and a signal outputter for applying the second signal to the target object at a preset period.
The impedance signal detection unit 402 is configured to obtain a response signal of the target object through the second lead line, filter an interference signal in the response signal, obtain an impedance signal, and input the obtained impedance signal to the cardiac output detection unit.
The impedance change signal detection unit 404 is configured to obtain an impedance signal output by the impedance signal detection unit, process the impedance signal to obtain an impedance change signal representing a change condition of the impedance signal, and input the impedance change signal to the cardiac output detection unit.
Based on this, the heart displacement detection unit 403 is specifically configured to estimate the heart displacement of the target object based on the impedance signal, the impedance change signal.
In estimating the cardiac output, in one embodiment, signal features of the impedance signal and the impedance variation signal may be extracted, and the cardiac output corresponding to the extracted signal features may be determined based on a pre-constructed correspondence between the signal features and the cardiac output. In another embodiment, the impedance signal and the impedance variation signal may be input into a second heart displacement detection model constructed in advance, so as to obtain heart displacement output by the second heart displacement detection model, where the second heart displacement detection model may be a model obtained by training a second initial neural network model by using a large number of sample impedance signals and sample impedance variation signals as training samples and using actual heart displacement of a sample object as a training reference, and is used for estimating heart displacement.
Specifically, the impedance change signal detection unit 404 may include a high-pass filter, a second signal amplifier, and a first low-pass filter. Wherein:
And the high-pass filter is used for filtering low-frequency components in the impedance signals and inputting the filtered impedance signals into the second signal amplifier.
And the second signal amplifier is used for amplifying the filtered impedance signal to obtain an initial impedance change signal, and inputting the initial impedance change signal into the first low-pass filter.
The first low-pass filter is used for filtering high-frequency components in the initial impedance change signal to obtain a final impedance change signal and outputting the impedance change signal.
Based on the foregoing embodiment corresponding to fig. 4, in one embodiment of the present application, the cardiac output detection system may further include an impedance differential signal detection unit, and based on this, in one embodiment of the present application, referring to fig. 5, fig. 5 is a schematic structural diagram of a fourth cardiac output detection system provided in an embodiment of the present application, where the system further includes an impedance differential signal detection unit 505.
The excitation signal generation unit 501 includes a signal generator and a signal output for applying a second signal to the target object at a preset period.
The impedance signal detection unit 502 is configured to obtain a response signal of the target object through the second lead line, filter an interference signal in the response signal, obtain an impedance signal, and input the obtained impedance signal to the cardiac output detection unit.
The impedance change signal detection unit 504 is configured to obtain an impedance signal output by the impedance signal detection unit, process the impedance signal to obtain an impedance change signal representing a change condition of the impedance signal, and input the impedance change signal to the cardiac output detection unit.
An impedance differential signal detection unit 505, configured to obtain an impedance change signal output by the impedance change signal detection unit 505, process the impedance change signal to obtain a differential signal of the impedance change signal, and input the differential signal to the cardiac output detection unit.
The heart displacement detection unit 503 is specifically configured to estimate the heart displacement of the target object based on the impedance signal, the impedance change signal, and the differential signal.
In estimating the heart displacement, in one embodiment, signal features of the impedance signal, the impedance change signal, and the differential signal may be extracted, and the heart displacement corresponding to the extracted signal features may be determined based on a correspondence between the pre-constructed signal features and the heart displacement. In another embodiment, the impedance signal, the impedance change signal, and the differential signal may be input into a third heart displacement detection model constructed in advance, to obtain the heart displacement output by the third heart displacement detection model, where the third heart displacement detection model may be a model that is obtained by training a third initial neural network model in advance using a large number of sample impedance signals, sample impedance change signals, and sample differential signals as training samples, and using the actual heart displacement of the sample object as a training reference, and is used for estimating the heart displacement.
Specifically, the impedance-differential-signal detecting unit 505 includes a signal differentiator, a second low-pass filter, wherein:
the signal differentiator is used for acquiring the impedance change signal, differentiating the impedance change signal to obtain an initial impedance differentiation signal, and inputting the initial impedance differentiation signal into the second low-pass filter;
And the second low-pass filter is used for filtering high-frequency components in the initial impedance differential signal to obtain a final impedance differential signal and outputting the impedance differential signal.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (9)
1. A heart displacement detection system, which is characterized by comprising an excitation signal generation unit, an impedance signal detection unit and a heart displacement detection unit, wherein the excitation signal generation unit comprises a signal generator and a signal output device; wherein:
The signal generator is used for generating a first signal with preset frequency, adjusting a voltage baseline of the first signal so that the voltage baseline of the first signal is set at a preset value to obtain a second signal, and inputting the second signal into the signal output device;
The signal output device is used for adjusting the amplitude of the second signal so that the adjusted amplitude is smaller than a preset threshold value, and applying the adjusted second signal to a target object according to a preset period through the first lead wire;
The impedance signal detection unit is used for acquiring a response signal of the target object through a second lead wire, filtering interference signals in the response signal to obtain an impedance signal, and inputting the obtained impedance signal into the heart displacement detection unit;
The heart displacement detection unit is used for estimating the heart displacement of the target object based on the impedance signal.
2. The system of claim 1, wherein the signal generator includes a voltage adjustment circuit, the voltage adjustment circuit performing voltage adjustment on the first signal to obtain a second signal; wherein the voltage adjustment circuit includes: the first capacitor (C1), the second capacitor (C2), the first resistor (R1), the second resistor (R2), the first analog operational amplifier (OP 1), the third resistor (R3), the fourth resistor (R4), the third capacitor (C3), the fourth capacitor (C4) and the second analog operational amplifier (OP 2);
One end of the first capacitor (C1) is used for inputting the first signal, and the other end of the first capacitor is respectively connected with the second capacitor (C2) and the first resistor (R1); the other end of the first resistor (R1) is respectively connected with the negative input end and the output end of the first analog operational amplifier (OP 1);
the other end of the second capacitor (C2) is respectively connected with the positive input end of the first analog operational amplifier (OP 1) and one end of the second resistor (R2); the other end of the second resistor (R2) is grounded; the output end of the first analog operational amplifier (OP 1) is also connected with one end of the third resistor (R3);
The other end of the third resistor (R3) is respectively connected with one end of the fourth resistor (R4) and one end of the third capacitor (C3); the other end of the third capacitor (C3) is respectively connected with the negative input end and the output end of the second analog operational amplifier (OP 2);
The other end of the fourth resistor (R4) is respectively connected with one end of the fourth capacitor (C4) and the positive input end of the second analog operational amplifier (OP 2); the other end of the fourth capacitor (C4) is grounded; the second analog operational amplifier (OP 2) output end is used for outputting the second signal.
3. The system according to claim 1 or2, further comprising a signal calibration unit connected in parallel with the excitation signal generation unit, the impedance signal detection unit, the signal calibration unit being configured to perform signal error calibration on a signal acquired by the impedance signal detection unit from the target object.
4. A system according to claim 3, characterized in that the signal calibration unit comprises a first data selector (F1), a second data selector (F2) and a calibration resistor (R5); wherein:
one end of the first data selector (F1) is connected with the excitation signal generation unit, and the other end of the first data selector is connected with the target object; one end of the second data selector (F2) is connected with the impedance signal detection unit, and the other end of the second data selector is connected with the target object;
the calibration resistor (R5) is connected in parallel to the first data selector (F1) and the second data selector (F2).
5. The system according to claim 1 or 2, wherein the impedance signal reactance detection unit comprises a common mode filter, a first signal amplifier, an envelope detector; wherein:
The common mode filter is used for filtering common mode interference signals in the response signals, determining the filtered signals as first impedance signals and inputting the first impedance signals into the amplifier;
The first signal amplifier is configured to amplify the first impedance signal, determine the amplified impedance signal as a second impedance signal, and input the second impedance signal into the envelope detector;
the envelope detector is configured to perform envelope detection on the second impedance signal, determine a signal after envelope detection as an impedance signal, and output the impedance signal.
6. The system according to claim 1 or 2, further comprising an impedance change signal detection unit; wherein:
the impedance change signal detection unit is used for acquiring an impedance signal output by the impedance signal detection unit, processing the impedance signal to obtain an impedance change signal representing the change condition of the impedance signal, and inputting the impedance change signal into the heart displacement detection unit;
The heart displacement detection unit is specifically configured to estimate heart displacement of the target object based on the impedance signal and the impedance variation signal.
7. The system of claim 6, wherein the impedance-varying signal detection unit comprises a high-pass filter, a second signal amplifier, a first low-pass filter, wherein:
the high-pass filter is used for filtering direct current components in the impedance signals and inputting the filtered impedance signals into the second signal amplifier;
The second signal amplifier is used for amplifying the filtered impedance signal to obtain an initial impedance change signal, and inputting the initial impedance change signal into the first low-pass filter;
The first low-pass filter is used for filtering high-frequency components in the initial impedance change signal to obtain a final impedance change signal, and outputting the impedance change signal.
8. The system of claim 6, further comprising an impedance differential signal detection unit; wherein:
The impedance differential signal detection unit is used for acquiring the impedance change signal output by the impedance change signal detection unit, processing the impedance change signal to obtain a differential signal of the impedance change signal, and inputting the differential signal into the heart displacement detection unit;
The heart displacement detection unit is specifically configured to estimate heart displacement of the target object based on the impedance signal, the impedance variation signal, and the differential signal.
9. The system of claim 8, wherein the impedance-differentiated signal detection unit comprises a signal differentiator, a second low pass filter, wherein:
the signal differentiator is used for acquiring the impedance change signal, differentiating the impedance change signal to obtain an initial impedance differentiation signal, and inputting the initial impedance differentiation signal into the second low-pass filter;
The second low-pass filter is used for filtering high-frequency components in the initial impedance differential signal to obtain a final impedance differential signal, and outputting the impedance differential signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410757754.5A CN118319281A (en) | 2024-06-13 | 2024-06-13 | Heart displacement detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410757754.5A CN118319281A (en) | 2024-06-13 | 2024-06-13 | Heart displacement detection system |
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| Publication Number | Publication Date |
|---|---|
| CN118319281A true CN118319281A (en) | 2024-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410757754.5A Pending CN118319281A (en) | 2024-06-13 | 2024-06-13 | Heart displacement detection system |
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| Country | Link |
|---|---|
| CN (1) | CN118319281A (en) |
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- 2024-06-13 CN CN202410757754.5A patent/CN118319281A/en active Pending
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