CN111208451A - Electrocardio lead falling detection circuit and method and medical monitoring equipment - Google Patents
Electrocardio lead falling detection circuit and method and medical monitoring equipment Download PDFInfo
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- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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- A—HUMAN NECESSITIES
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- A61B2576/00—Medical imaging apparatus involving image processing or analysis
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- A61B2576/023—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part for the heart
Abstract
The invention discloses an electrocardio lead falling detection circuit and method and medical monitoring equipment. The method comprises the following steps: the first input end of the operational amplifier is connected with the lead to be detected, and the second input end of the operational amplifier is connected with the output end of the operational amplifier; the input end of the analog-to-digital converter is connected with the output end of the operational amplifier and used for sampling an output signal of the output end of the operational amplifier, and the processor is connected with the output end of the analog-to-digital converter and used for acquiring the output signal of the analog-to-digital converter, comparing the output signal of the analog-to-digital converter with a second threshold voltage and determining whether the lead to be detected falls off or not according to a comparison result. By the method and the device, the effect of improving the accuracy of detecting the falling of the electrocardio leads is achieved.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to an electrocardio lead falling detection circuit and method and medical monitoring equipment.
Background
When detecting whether the ECG cable is disconnected, a comparator scheme is generally adopted in the prior art, a pull-up or pull-down current source is connected with the input of the ECG cable and then connected to one input end of the comparator, and the other input end of the comparator is connected with a threshold voltage to be compared. When the connection state of all lead wires is good, the voltage of the lead wires is the common-mode voltage of the electrocardio acquisition circuit, and the output level of the comparator represents that the lead wires are normally connected under the condition; when the lead wire falls off, the lead of the lead wire is driven by the current source and then deviates from the original common mode voltage, and the output level of the comparator indicates that the lead falls off under the condition. Large power frequency interference signals are coupled to leads dropped under certain conditions (such as poor grounding of the monitor), and cause periodic jumps in the output state of the comparator, which if filtered completely would cause the leads to be dropped and not recognized.
Aiming at the problem of inaccurate detection result of central electric conduction connecting line falling in the related technology, no effective solution is provided at present.
Disclosure of Invention
The invention mainly aims to provide an electrocardio lead falling detection circuit, an electrocardio lead falling detection method and medical monitoring equipment, and aims to solve the problem that an electrocardio lead falling detection result is inaccurate.
In order to achieve the above object, according to one aspect of the present invention, there is provided an electrocardiograph lead fall-off detection circuit, comprising: the first input end of the operational amplifier is connected with the lead to be detected, and the second input end of the operational amplifier is connected with the output end of the operational amplifier; the first input end of the comparator is connected with the output end of the operational amplifier, the second input end of the comparator is used for inputting a first threshold voltage, the comparator is used for comparing the collected output end voltage of the operational amplifier with the first threshold voltage and outputting a signal from the output end of the comparator based on a comparison result, and the processor determines whether the lead to be detected falls off or not according to the output signal of the output end of the comparator.
Further, the circuit further comprises: a first voltage dividing circuit, a first end of the first voltage dividing circuit being connected to an output end of the operational amplifier; and a second voltage division circuit, wherein a first end of the second voltage division circuit is connected with a second end of the first voltage division circuit, and a second end of the second voltage division circuit is grounded.
Further, the first voltage dividing circuit includes a first resistor; the second voltage division circuit includes a second resistor.
Further, the resistance values of the first resistor R1 and the second resistor R2 satisfy the condition V1 × R2/(R1+ R2) ≦ V2, where V1 represents the maximum output voltage of the operational amplifier, and V2 represents the maximum input voltage of the comparator.
Further, the processor sequentially collects output signals of the comparator at a time interval T, counts the number m of the first threshold voltages which are greater than or equal to the first threshold voltage and the number n of the first threshold voltages which are smaller than the first threshold voltage in the period T, and identifies that the electrode corresponding to the lead to be detected falls off if m is greater than or equal to a set threshold m0 and n is greater than or equal to a set threshold n 0.
In order to achieve the above object, according to another aspect of the present invention, there is provided another electrocardiographic lead fall-off detection circuit, comprising: the first input end of the operational amplifier is connected with the lead to be detected, and the second input end of the operational amplifier is connected with the output end of the operational amplifier; the input end of the analog-to-digital converter is connected with the output end of the operational amplifier and used for sampling an output signal of the output end of the operational amplifier, and the processor is connected with the output end of the analog-to-digital converter and used for acquiring the output signal of the analog-to-digital converter, comparing the output signal of the analog-to-digital converter with a second threshold voltage and determining whether the lead to be detected falls off or not according to a comparison result.
Further, the circuit further comprises: a first voltage dividing circuit, a first end of the first voltage dividing circuit being connected to an output end of the operational amplifier; and a second voltage division circuit, wherein a first end of the second voltage division circuit is connected with a second end of the first voltage division circuit, and a second end of the second voltage division circuit is grounded.
Further, the first voltage dividing circuit includes a first resistor; the second voltage division circuit includes a second resistor.
Further, the resistance values of the first resistor R1 and the second resistor R2 satisfy the condition V1 × R2/(R1+ R2) ≦ V2, where V1 represents the maximum output voltage of the operational amplifier, and V2 represents the maximum input voltage of the analog-to-digital converter.
Further, the processor sequentially collects the output signals of the analog-to-digital converter at a time interval T, counts the number m of the second threshold voltages which is greater than or equal to the second threshold voltage number m and the number n of the second threshold voltages which is less than the second threshold voltage number n in the period T, and if m is greater than or equal to a set threshold value m0 and n is greater than or equal to a set threshold value n0, the electrode corresponding to the lead to be detected is identified to fall off.
Further, the processor sequentially collects output signals of the analog-to-digital converter at a time interval T, counts the number m of the second threshold voltages and the number n of the second threshold voltages, wherein the number m of the second threshold voltages is greater than or equal to a set threshold m1, and the number n of the third threshold voltages is less than or equal to a set threshold n1, and identifies that the electrode corresponding to the lead to be detected falls off, wherein the second threshold voltage is greater than the third threshold voltage.
Further, the processor calculates an absolute value of a slope of a rising edge or a falling edge of the acquired waveform according to the output signal of the analog-to-digital converter, compares the absolute value of the slope with a set threshold value, and determines whether the corresponding electrode falls off according to a comparison result.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a parameter measurement module for a medical monitoring device, the module including: the electrocardiosignal input end is used for connecting an electrocardiosignal lead accessory so as to obtain electrocardiosignals collected by each lead; the lead falling detection device comprises the electrocardio lead falling detection circuit, the signal input end of the lead falling detection device is connected to the electrocardio signal input end to obtain a signal of a lead to be detected, and whether the lead to be detected falls off is determined based on the signal of the lead to be detected; the signal input end of the electrocardiosignal processing device is connected to the electrocardiosignal input end so as to obtain electrocardiosignals collected by each lead and process the electrocardiosignals; and the electrocardiosignal output end is used for being connected to the medical monitoring equipment and outputting the electrocardiosignals acquired by each lead after being processed by the electrocardiosignal processing device and the detection result of the lead falling detection device.
Further, the lead to be detected is a right leg lead.
Furthermore, the lead to be detected is multiple, and the multiple leads to be detected are switched into the electrocardio lead falling detection circuit through one-out-of-multiple analog switches.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a medical monitoring apparatus comprising: an electrocardiographic lead attachment; a parameter measurement module according to the present invention; the host is connected with the parameter measuring module and used for processing the measuring result of the parameter measuring module to obtain a processing result; and the display is connected with the host and used for displaying the processing result.
In order to achieve the above object, according to another aspect of the present invention, there is also provided an electrocardiographic lead fall-off detection method, including acquiring a collection signal of a lead to be detected; judging whether the lead to be detected has a saturated power frequency interference signal or not based on the acquired signal of the lead to be detected; and determining that the lead to be detected is in a falling state if the lead to be detected has the saturated power frequency interference signal.
Further, the lead to be detected is a right leg lead.
Further, detecting the saturated power frequency interference signal of the lead to be detected includes: the circuit provided by the invention is used for detecting the saturated power frequency interference signal of the lead to be detected.
According to the invention, through an operational amplifier, a first input end of the operational amplifier is connected with a lead to be detected, and a second input end of the operational amplifier is connected with an output end of the operational amplifier; the device comprises a comparator, wherein a first input end of the comparator is connected with an output end of an operational amplifier, a second input end of the comparator is used for inputting a first threshold voltage, the comparator is used for comparing the collected output end voltage of the operational amplifier with the first threshold voltage and outputting a signal from the output end of the comparator based on a comparison result, and a processor determines whether a lead to be detected falls off or not according to the output signal of the output end of the comparator.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an ECG lead dropout detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an ECG lead dropout detection circuit according to another embodiment of the invention;
FIG. 3 is a schematic diagram of a parameter measurement module for a medical monitoring device according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a medical monitoring device according to an embodiment of the invention;
FIG. 5 is a schematic diagram of multiple leads sharing the same dropout detection circuit in one embodiment of the invention;
FIG. 6 is a schematic diagram of waveforms acquired by the ADC with leads in a first connection state;
FIG. 7 is a schematic diagram of the number of points collected by the ADC when a single threshold is used with the leads in the second connection state;
FIG. 8 is a schematic diagram of ADC acquisition to dot count with dual thresholds of sampling with leads in the second connection state.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all 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 application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides an electrocardio lead falling detection circuit.
The circuit includes: an operational amplifier, a comparator and a processor.
And the first input end of the operational amplifier is connected with the lead to be detected, and the second input end of the operational amplifier is connected with the output end of the operational amplifier.
And the comparator is used for comparing the acquired output end voltage of the operational amplifier with the first threshold voltage and outputting a signal from the output end of the comparator based on a comparison result.
And the processor determines whether the lead to be detected falls off or not according to the output signal of the output end of the comparator.
In the embodiment of the present invention, the first input terminal of the operational amplifier may be a non-inverting input terminal, and the second input terminal is an inverting input terminal. The first input end of the comparator may be a non-inverting input end, the second input end of the comparator may be an inverting input end, the first threshold voltage input by the inverting input end of the comparator may be a reference voltage of the comparator, the reference voltage value may be set according to a specific use scenario, the comparator may compare voltages of the two input ends to obtain a comparison result, and output a signal according to the comparison result, for example, output a high-low potential signal, and the processor determines whether the lead to be detected falls off according to the output signal.
Optionally, the circuit further includes: the first end of the first voltage division circuit is connected with the output end of the operational amplifier; and the first end of the second voltage division circuit is connected with the second end of the first voltage division circuit, and the second end of the second voltage division circuit is grounded. The first voltage division circuit and the second voltage division circuit can be used for carrying out voltage division protection on the electrocardio-coupler falling-off detection circuit.
Optionally, the first voltage dividing circuit may include a first resistor; the second voltage dividing circuit may include a second resistor.
FIG. 1 is a schematic diagram of an ECG lead drop detection circuit according to an embodiment of the present invention, as shown in FIG. 1, the circuit includes: the non-inverting input end of the operational amplifier U1 is connected with a lead to be detected (such as a right leg lead RL), the first resistor R1, the second resistor R2, the comparator U2, and the output end of the comparator U2 is connected with the processor. The R1 and R2 are connected with the positive input end of the comparator U2 after voltage division, the negative input end of the U2 is connected with a threshold voltage V for comparison, when the voltage of the positive input end is greater than or equal to V, the U2_ OUT outputs high level, otherwise, the U2_ OUT outputs low level.
Optionally, the resistance values of the first resistor R1 and the second resistor R2 satisfy the condition V1 × R2/(R1+ R2) ≦ V2, where V1 represents the maximum output voltage of the operational amplifier, and V2 represents the maximum input voltage of the comparator.
Optionally, the processor sequentially collects output signals of the comparator at a time interval T, counts the number m of the first threshold voltages greater than or equal to the first threshold voltage and the number n of the first threshold voltages smaller than the first threshold voltage within the period T, and identifies that the electrode corresponding to the lead to be detected falls off if m is greater than or equal to the set threshold m0 and n is greater than or equal to the set threshold n 0.
Specifically, during detection, the output signals of the comparator can be collected at regular time intervals t, the number of voltages which are greater than or equal to a first threshold voltage and the number of voltages which are smaller than the first threshold voltage in the output signals in a period are counted, and if the number of voltages which are greater than or equal to the first threshold voltage exceeds a preset number, the electrodes corresponding to the leads to be detected fall off. If the falling-off is identified, corresponding prompt information can be sent out, such as a buzzer alarm or a light flashing prompt.
The embodiment of the invention also provides another electrocardio lead falling detection circuit.
The circuit includes: operational amplifier, analog-to-digital converter, treater.
And the first input end of the operational amplifier is connected with the lead to be detected, and the second input end of the operational amplifier is connected with the output end of the operational amplifier.
And the input end of the analog-to-digital converter is connected with the output end of the operational amplifier and is used for sampling the output signal of the output end of the operational amplifier.
And the processor is connected with the output end of the analog-to-digital converter and used for acquiring an output signal of the analog-to-digital converter, comparing the output signal of the analog-to-digital converter with the second threshold voltage and determining whether the lead to be detected falls off or not according to a comparison result.
In this embodiment, the analog-to-digital converter replaces the comparator in the previous embodiment.
Optionally, the circuit further includes: the first end of the first voltage division circuit is connected with the output end of the operational amplifier; and the first end of the second voltage division circuit is connected with the second end of the first voltage division circuit, and the second end of the second voltage division circuit is grounded.
Optionally, the first voltage dividing circuit includes a first resistor; the second voltage division circuit includes a second resistor.
Optionally, the resistance values of the first resistor R1 and the second resistor R2 satisfy the condition V1 × R2/(R1+ R2) ≦ V2, where V1 represents the maximum output voltage of the operational amplifier, and V2 represents the maximum input voltage of the analog-to-digital converter. The output voltage of the operational amplifier may be equal to or greater than the maximum input voltage of the ADC, and the resistors divide the voltage. And if the maximum voltage output by the U1 is V1 and the maximum input voltage of the ADC is V2, the constraint on the resistance value is V1 × R2/(R1+ R2) ≦ V2.
Optionally, the processor sequentially collects the output signals of the analog-to-digital converter at a time interval T, counts the number m of the second threshold voltages greater than or equal to the second threshold voltage and the number n of the second threshold voltages less than the second threshold voltage within the period T, and identifies that the electrode corresponding to the lead to be detected falls off if m is greater than or equal to the set threshold m0 and n is greater than or equal to the set threshold n 0.
Optionally, the processor sequentially collects output signals of the analog-to-digital converter at a time interval T, counts the number m of the second threshold voltages and the number n of the third threshold voltages within the period T, and identifies that the electrode corresponding to the lead to be detected falls off if m is greater than or equal to the set threshold m1 and n is greater than or equal to the set threshold n1, where the second threshold voltage is greater than the third threshold voltage.
In the scheme of the analog-to-digital converter, the processor may set only one threshold voltage for the comparison of the voltage magnitudes, or may set two different threshold voltages for the comparison. The threshold voltage value can also be changed, and corresponding adjustment is carried out according to the circuit power supply voltage and the interference degree in the power frequency environment.
Optionally, the processor calculates an absolute value of a slope of a rising edge or a falling edge of the acquired waveform according to the output signal of the analog-to-digital converter, compares the absolute value of the slope with a set threshold, and determines whether the corresponding electrode falls off according to the comparison result.
FIG. 2 is a schematic diagram of an electrocardiograph lead-off detection circuit according to another embodiment of the present invention, as shown in FIG. 2, the circuit mainly includes an operational amplifier U1, a resistor R1, a resistor R2 and an analog-to-digital converter U2 (i.e., ADC); the positive output end of the operational amplifier U1 is connected with the lead to be detected; the inverting input end of the operational amplifier U1 is connected with the output end thereof; the output end of the operational amplifier U1 is simultaneously connected to one end of a resistor R1; the other end of the resistor R1 is connected with the resistor R2 and the input end of the analog-to-digital converter U2; the other end of the resistor R2 is connected to circuit ground.
The electrocardio lead falling detection circuit can execute the electrocardio lead falling detection method of the embodiment of the invention, firstly, a threshold V of power frequency interference amplitude is set, output voltages of an analog-to-digital converter are sequentially collected at a time interval T, the number m of the threshold voltages which are greater than or equal to the threshold voltage and the number n of the threshold voltages which are less than or equal to the threshold voltage in a statistical period T are counted, and if m is greater than or equal to a set threshold m0, n is greater than or equal to a set threshold n0, corresponding electrode falling is identified at the moment.
In addition to counting the number of voltages, the judgment can also be performed by calculating the slope, when a saturated power frequency interference signal exists, the absolute value k of the slope of the rising edge or the falling edge of the acquired waveform is calculated according to the acquired voltage value, and if the k is greater than or equal to a set threshold value k0, the corresponding electrode is identified to fall off.
The electrocardio lead wire falling detection device can identify whether saturated power frequency interference signals exist or not by detecting the form of the electrocardio lead signals, sets the corresponding lead connection state to be in falling when the saturated power frequency signals are detected, and gives a lead falling alarm on a monitor interface to prompt a client to check the connection condition of the lead wires.
Compared with the analog-to-digital converter adopted in the second embodiment, the comparator adopted in the first embodiment of the invention has the advantages that the ADC peripheral integrated by the existing processor on the board card can be used, and devices do not need to be added independently, so that the cost is lower; in addition, after the ADC acquires the voltage, the comparison process is processed by software, the number of the threshold values is more flexibly set, and only one threshold value can be set by one comparator when a comparator scheme is adopted.
The embodiment of the invention also provides a parameter measuring module for the medical monitoring equipment. Fig. 3 is a schematic diagram of a parameter measurement module for a medical monitoring device according to an embodiment of the present invention, as shown in fig. 3, the module includes: the electrocardiosignal input end is used for connecting an electrocardiosignal lead accessory so as to obtain electrocardiosignals collected by each lead; the lead falling detection device comprises the electrocardio lead falling detection circuit, the signal input end of the lead falling detection device is connected to the electrocardio signal input end to obtain a signal of the lead to be detected, and whether the lead to be detected falls off is determined based on the signal of the lead to be detected; the signal input end of the electrocardiosignal processing device is connected to the electrocardiosignal input end so as to obtain electrocardiosignals collected by each lead and process the electrocardiosignals; and the electrocardiosignal output end is used for being connected to the medical monitoring equipment and outputting the electrocardiosignals acquired by each lead after being processed by the electrocardiosignal processing device and the detection result of the lead falling detection device. The parameter measuring module can be plugged into a plug-in medical monitoring device (such as a plug-in monitor) to perform electrocardiogram monitoring.
Optionally, the lead to be detected is a right leg lead.
Optionally, the number of the leads to be detected is multiple, and the multiple leads to be detected are switched to be connected into the electrocardio lead falling detection circuit through one more-out-of-multiple analog switches.
The electrocardiosignal input end of the parameter measuring module for the medical monitoring equipment can be directly connected with the right leg lead, and other leads adopt the same detection circuit as the detection circuit in the related technology, or all leads to be detected are switched to be alternately connected with the electrocardiolead falling detection circuit through one-out-of-multiple analog switches. The one-out-of-multiple analog switch may be a one-out-of-ten analog switch.
An embodiment of the present invention further provides a medical monitoring device, fig. 4 is a schematic diagram of the medical monitoring device according to the embodiment of the present invention, and as shown in fig. 4, the medical monitoring device includes: an electrocardiographic lead attachment; the parameter measuring module of the invention; the host is connected with the parameter measuring module and used for processing the measuring result of the parameter measuring module to obtain a processing result; and the display is connected with the host and used for displaying the processing result.
In order to achieve the above object, according to another aspect of the present invention, there is also provided an electrocardiographic lead fall-off detection method, including acquiring a collection signal of a lead to be detected; judging whether the lead to be detected has a saturated power frequency interference signal or not based on the acquired signal of the lead to be detected; and determining that the lead to be detected is in a falling state if the saturated power frequency interference signal exists in the lead to be detected.
Whether a saturated power frequency interference signal exists is identified by detecting the form of the electrocardio lead signal, when the saturated power frequency signal is detected, the corresponding lead connection state is set to be off, and simultaneously, a lead off alarm is given on a monitor interface to prompt a client to check the connection condition of a lead wire.
Optionally, the lead to be detected is a right leg lead.
Optionally, the detecting the saturated power frequency interference signal of the lead to be detected includes: the circuit of the invention is adopted to detect the saturated power frequency interference signal of the lead to be detected.
The electrocardio lead falling detection circuit can be applied to each input electrode, and the deformation form is that all the input electrodes share the same lead falling detection circuit through a multi-channel data selector (see figure 5); the other variant is that the electrodes except the right leg use a comparator scheme in an electrocardio acquisition analog front-end chip, the lead falling detection circuit is only used on the output of a right leg drive amplifier, and all electrodes are arranged in a falling state after the circuit detects a saturated power frequency interference signal. In fig. 5, LA, RA, LL, V1-V6 in the electrocardiographic lead configuration are measurement electrodes, RL electrode is a neutral electrode, and when the RL electrode falls off, the measurement results on all leads are abnormal, and at this time, all electrodes should be placed in a falling state. At this time, the technical alarm ECG leads are usually dropped on the monitor. That is, RL electrode falloff and all other measurement electrode falloff are equivalent.
Fig. 6 to 8 are schematic diagrams of waveforms acquired by the ADC when the leads are in different connection states.
As shown in fig. 6, when the connection of the lead wires is normal, the voltage collected by the ADC is the common mode voltage of the circuit, and is smaller than the drop detection threshold voltage V.
After the lead wire falls off, the waveform of the fallen lead coupled with the power frequency interference is shown in fig. 7, and the number m of points greater than or equal to V in the period T and the number n of points smaller than V in the period T are counted.
Using only one threshold value does not determine that the signal is saturated. As shown in fig. 8, when two threshold voltages are used, the threshold values VA and VB are set for the upper limit value and the lower limit value of the saturation signal, respectively, so that the power frequency signal is more accurately characterized.
The threshold value adjusting scheme of the embodiment of the invention is as follows: the power supply voltage V1 of the ECG acquisition circuit and the maximum input voltage V2 of the ADC acquisition circuit are respectively 0 to V2 of the voltage threshold V (or VA or VB). The waveform on the drop lead is collected by means of a device (e.g. an isolation oscilloscope, a data acquisition card, etc.), and the voltage threshold V (or VA or VB) and the number thresholds m0, n0 are selected according to the waveform morphology.
By the technical scheme of the embodiment of the invention, the lead falling can be accurately identified, and the ECG lead falling can still be accurately judged when the whole monitor is in poor grounding or is not grounded.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
An embodiment of the present invention provides a storage medium having a program stored thereon, where the program, when executed by a processor, implements the method for detecting an ecg lead drop.
The embodiment of the invention provides a processor, which is used for running a program, wherein the electrocardio lead falling-off detection method is executed when the program runs.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that 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 an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (19)
1. An electrocardiograph lead fall-off detection circuit, comprising:
the first input end of the operational amplifier is connected with the lead to be detected, and the second input end of the operational amplifier is connected with the output end of the operational amplifier;
a comparator, a first input terminal of which is connected to an output terminal of the operational amplifier, a second input terminal of which is used for inputting a first threshold voltage, the comparator being used for comparing the collected output terminal voltage of the operational amplifier with the first threshold voltage and outputting a signal from an output terminal of the comparator based on the comparison result,
and the processor determines whether the lead to be detected falls off or not according to the output signal of the output end of the comparator.
2. The circuit of claim 1, further comprising:
a first voltage dividing circuit, a first end of the first voltage dividing circuit being connected to an output end of the operational amplifier;
and a second voltage division circuit, wherein a first end of the second voltage division circuit is connected with a second end of the first voltage division circuit, and a second end of the second voltage division circuit is grounded.
3. The circuit of claim 2,
the first voltage division circuit comprises a first resistor;
the second voltage division circuit includes a second resistor.
4. The circuit of claim 3, wherein the resistance values of the first resistor R1 and the second resistor R2 satisfy the condition V1R 2/(R1+ R2). ltoreq.V 2, wherein V1 represents the maximum output voltage of the operational amplifier, and V2 represents the maximum input voltage of the comparator.
5. The circuit of claim 1, wherein the processor sequentially collects the output signals of the comparators at time intervals T, counts a number m greater than or equal to a first threshold voltage and a number n less than the first threshold voltage within a period T, and identifies the electrode falling corresponding to the lead to be detected if m is greater than or equal to a set threshold m0 and n is greater than or equal to a set threshold n 0.
6. An electrocardiograph lead fall-off detection circuit, comprising:
the first input end of the operational amplifier is connected with the lead to be detected, and the second input end of the operational amplifier is connected with the output end of the operational amplifier;
an analog-to-digital converter, the input end of which is connected with the output end of the operational amplifier and is used for sampling the output signal of the output end of the operational amplifier,
and the processor is connected with the output end of the analog-to-digital converter and used for acquiring the output signal of the analog-to-digital converter, comparing the output signal of the analog-to-digital converter with a second threshold voltage and determining whether the lead to be detected falls off or not according to the comparison result.
7. The circuit of claim 6, further comprising:
a first voltage dividing circuit, a first end of the first voltage dividing circuit being connected to an output end of the operational amplifier;
and a second voltage division circuit, wherein a first end of the second voltage division circuit is connected with a second end of the first voltage division circuit, and a second end of the second voltage division circuit is grounded.
8. The circuit of claim 7,
the first voltage division circuit comprises a first resistor;
the second voltage division circuit includes a second resistor.
9. The circuit of claim 8, wherein the resistance values of the first resistor R1 and the second resistor R2 satisfy the condition V1 × R2/(R1+ R2) ≦ V2, wherein V1 represents the maximum output voltage of the operational amplifier and V2 represents the maximum input voltage of the analog-to-digital converter.
10. The circuit according to claim 6, wherein the processor sequentially collects the output signals of the analog-to-digital converter at time intervals T, counts the number m greater than or equal to the second threshold voltage and the number n less than the second threshold voltage within a period T, and identifies that the electrode corresponding to the lead to be detected is detached if m is greater than or equal to a set threshold m0 and n is greater than or equal to a set threshold n 0.
11. The circuit according to claim 6, wherein the processor sequentially collects the output signals of the analog-to-digital converter at time intervals T, counts a number m greater than or equal to the second threshold voltage and a number n less than a third threshold voltage within a period T, and identifies that the electrode corresponding to the lead to be detected is detached if m is greater than or equal to a set threshold m1 and n is greater than or equal to a set threshold n1, wherein the second threshold voltage is greater than the third threshold voltage.
12. The circuit of claim 6, wherein the processor calculates an absolute value of a slope of a rising edge or a falling edge of the acquired waveform according to the output signal of the analog-to-digital converter, compares the absolute value of the slope with a set threshold, and determines whether the corresponding electrode is detached according to the comparison result.
13. A parameter measurement module for a medical monitoring device, comprising:
the electrocardiosignal input end is used for connecting an electrocardiosignal lead accessory so as to obtain electrocardiosignals collected by each lead;
a lead fall-off detection device comprising the electrocardiographic lead fall-off detection circuit according to any one of claims 1 to 11, wherein a signal input end of the lead fall-off detection device is connected to the electrocardiographic signal input end to obtain a signal of a lead to be detected, and determine whether the lead to be detected falls off based on the signal of the lead to be detected;
the signal input end of the electrocardiosignal processing device is connected to the electrocardiosignal input end so as to obtain electrocardiosignals collected by each lead and process the electrocardiosignals;
and the electrocardiosignal output end is used for being connected to the medical monitoring equipment and outputting the electrocardiosignals acquired by each lead after being processed by the electrocardiosignal processing device and the detection result of the lead falling detection device.
14. The module of claim 13, wherein the lead to be detected is a right leg lead.
15. The module of claim 13, wherein the lead to be detected is multiple, and the multiple leads to be detected are switched into the electrocardiograph lead falling detection circuit through a one-out-of-multiple analog switch.
16. A medical monitoring device, comprising:
an electrocardiographic lead attachment;
the parameter measurement module of any of claims 13 to 15;
the host is connected with the parameter measuring module and used for processing the measuring result of the parameter measuring module to obtain a processing result;
and the display is connected with the host and used for displaying the processing result.
17. An electrocardiographic lead fall-off detection method is characterized by comprising the following steps:
acquiring a collection signal of a lead to be detected;
judging whether the lead to be detected has a saturated power frequency interference signal or not based on the acquired signal of the lead to be detected;
and determining that the lead to be detected is in a falling state if the lead to be detected has the saturated power frequency interference signal.
18. The method of claim 17, wherein the lead to be detected is a right leg lead.
19. The method of claim 17, wherein detecting the saturated power frequency interference signal of the lead to be detected comprises:
the circuit according to any one of claims 1 to 12 is used for detecting the saturated power frequency interference signal of the lead to be detected.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114224352A (en) * | 2022-01-17 | 2022-03-25 | 武汉吉星医疗科技有限公司 | System and method for detecting lead falling of electrocardiograph based on RBF neural network |
| CN114305437A (en) * | 2020-10-10 | 2022-04-12 | Oppo（重庆）智能科技有限公司 | Electrocardio characteristic detection device and method and electrocardio characteristic detection system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2158107C2 (en) * | 1995-09-13 | 2000-10-27 | Научно-исследовательский институт кардиологии Минздравмедпрома РФ | Monitor device for measuring arterial blood pressure |
| US6421554B1 (en) * | 1998-12-31 | 2002-07-16 | Samsung Electronics Co., Ltd. | Method and device for detecting fault of lead in electrocardiogram system |
| US20030083584A1 (en) * | 2000-08-15 | 2003-05-01 | Cardiac Pacemakers, Inc. | Electrocardiograph leads-off indicator |
| CN102068247A (en) * | 2011-01-27 | 2011-05-25 | 深圳市理邦精密仪器股份有限公司 | Method and device for carrying out ECG (Electrocardiograph) lead-off detection |
| CN103371816A (en) * | 2012-04-25 | 2013-10-30 | 深圳迈瑞生物医疗电子股份有限公司 | Bio-electricity signal detection circuit, lead wire detection circuit and medical device |
| CN104000582A (en) * | 2014-05-04 | 2014-08-27 | 山东中医药大学 | Lead falling detection device for electrocardiogram monitoring device |
| CN205179005U (en) * | 2015-03-02 | 2016-04-20 | 上海鲁交测控科技有限公司 | Speed sensor signal conditioning circuit |
| CN108013875A (en) * | 2016-10-28 | 2018-05-11 | 深圳市理邦精密仪器股份有限公司 | Electrocardioelectrode comes off monitoring device and its detection method |
-
2018
- 2018-11-22 CN CN201811401023.8A patent/CN111208451B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2158107C2 (en) * | 1995-09-13 | 2000-10-27 | Научно-исследовательский институт кардиологии Минздравмедпрома РФ | Monitor device for measuring arterial blood pressure |
| US6421554B1 (en) * | 1998-12-31 | 2002-07-16 | Samsung Electronics Co., Ltd. | Method and device for detecting fault of lead in electrocardiogram system |
| US20030083584A1 (en) * | 2000-08-15 | 2003-05-01 | Cardiac Pacemakers, Inc. | Electrocardiograph leads-off indicator |
| US6597942B1 (en) * | 2000-08-15 | 2003-07-22 | Cardiac Pacemakers, Inc. | Electrocardiograph leads-off indicator |
| CN102068247A (en) * | 2011-01-27 | 2011-05-25 | 深圳市理邦精密仪器股份有限公司 | Method and device for carrying out ECG (Electrocardiograph) lead-off detection |
| CN103371816A (en) * | 2012-04-25 | 2013-10-30 | 深圳迈瑞生物医疗电子股份有限公司 | Bio-electricity signal detection circuit, lead wire detection circuit and medical device |
| CN104000582A (en) * | 2014-05-04 | 2014-08-27 | 山东中医药大学 | Lead falling detection device for electrocardiogram monitoring device |
| CN205179005U (en) * | 2015-03-02 | 2016-04-20 | 上海鲁交测控科技有限公司 | Speed sensor signal conditioning circuit |
| CN108013875A (en) * | 2016-10-28 | 2018-05-11 | 深圳市理邦精密仪器股份有限公司 | Electrocardioelectrode comes off monitoring device and its detection method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305437A (en) * | 2020-10-10 | 2022-04-12 | Oppo（重庆）智能科技有限公司 | Electrocardio characteristic detection device and method and electrocardio characteristic detection system |
| CN114305437B (en) * | 2020-10-10 | 2024-01-30 | Oppo（重庆）智能科技有限公司 | Electrocardiogram feature detection device and method, and electrocardiograph feature detection system |
| CN114224352A (en) * | 2022-01-17 | 2022-03-25 | 武汉吉星医疗科技有限公司 | System and method for detecting lead falling of electrocardiograph based on RBF neural network |
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