CN106236020B - A blood flow state detection device, system and method - Google Patents

Abstract

The present invention provides a kind of blood flow state detection devices, system and method, the blood flow state detection device includes: alternating voltage offer portion, at least a pair of of detecting electrode and test section, wherein, alternating voltage offer portion, it include: at least a pair of of alternating voltage port, every a pair of alternating voltage port is connected with a pair of of detecting electrode, for exporting alternating voltage for a pair of of detecting electrode；Every a pair of of detecting electrode extremely includes adhesion layer at least a pair of of detecting electrode；Every a pair of detecting electrode adheres to skin surface by adhesion layer, for receiving the alternating voltage of alternating voltage offer portion output；Test section, for when alternating voltage offer portion is that at least a pair of of detecting electrode provides alternating voltage, the impedance variations value detected in the circuit that every a pair of of detecting electrode is formed to determine blood flow state according to impedance variations value.Scheme provided by the invention realizes while detecting thrombus and leakage blood.

Description

A blood flow state detection device, system and method

technical field

The invention relates to the technical field of medical devices, and in particular, to a blood flow state detection device, system and method.

Background technique

In the process of medical operation, doctors often cut the wound with a scalpel to expose the part to be operated on, which is convenient for medical staff to perform the operation. After the operation is completed, the doctor also needs to perform operations such as sutures to the wound to ensure normal blood flow at the wound site and gradual healing. Then, in the process of wound healing, it is often necessary to observe whether there is blood leakage or thrombosis in the wound at all times.

At present, the thrombus in the blood vessel is mainly detected by emitting light of a fixed wavelength into the blood vessel and receiving the returned reflected light. The existing thrombus detection method cannot detect blood leakage at the same time.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a blood flow state detection device, system and method, which realizes the simultaneous detection of thrombus and blood leakage.

A blood flow state detection device, comprising: an alternating voltage supply part, at least one pair of detection electrodes, and a detection part, wherein,

The alternating voltage providing part includes: at least a pair of alternating voltage ports, wherein each pair of alternating voltage ports is connected to a pair of detection electrodes, and is used for outputting alternating voltages for the pair of detection electrodes;

the extreme ends of each of the at least one pair of detection electrodes comprise an adhesive layer;

Each pair of detection electrodes is adhered to the skin surface through the adhesive layer, and is used for receiving the alternating voltage output by the alternating voltage providing part;

The detection part is used to detect the impedance change value in the loop formed by each pair of detection electrodes when the alternating voltage supply part provides the alternating voltage to the at least one pair of detection electrodes, and according to the impedance change value , to determine the blood flow status.

Preferably, the alternating voltage supply part includes: a transformer, wherein,

The transformer, connected to the power supply system of the peripheral device, is used for receiving the first alternating voltage input by the power supply system of the peripheral device, and converting the first alternating voltage into the second alternating voltage;

Each pair of detection electrodes is used for receiving the second alternating voltage output by the alternating voltage providing part.

Preferably, the detection part includes: a current detector, a calculation subunit and a judgment subunit, wherein,

The current detector is used to detect the initial current generated by each pair of detection electrodes, and to detect the running current of each pair of detection electrodes in real time;

The calculation subunit is used to calculate the impedance change value in the loop formed by each pair of detection electrodes according to the initial current detected by the current detector and the corresponding operating current, using the following calculation formula (1);

in, represents the j-th impedance change value between the n-th pair of detection electrodes detected by the current detector; U represents the alternating voltage output by the alternating voltage supply part; I _n0 represents the initial current of the n-th pair of detection electrodes detected by the current detector; The jth running current value between the nth pair of detection electrodes detected by the I _nj current detector;

The judging subunit is configured to determine blood leakage when the impedance change value calculated by the calculation subunit is less than zero; determine the thrombus when the impedance change value calculated by the calculation subunit is greater than zero; When the impedance change value calculated by the calculation subunit is equal to zero, it is determined that the blood flow is normal.

Preferably, the judging subunit is configured to set a first threshold, a second threshold and a third threshold, and determine the first number of impedance variation values calculated by the calculation subunit that is continuously smaller than the first threshold, Determine whether the first number is greater than the third threshold, and if so, determine blood leakage; determine the second number of impedance change values calculated by the calculation subunit that is continuously greater than the second threshold, and determine Whether the second number is greater than the third threshold, and if so, determine blood leakage.

Preferably, the detection part further comprises: a signal converter and a display, wherein,

The signal converter is used to convert the impedance change value calculated by the calculation subunit into a corresponding electrical signal, and output the electrical signal to the display;

The display is used for receiving the electrical signals output by the signal converter, and outputting the electrical signals in time sequence to form a display waveform.

Preferably, the above-mentioned blood flow state detection device is applied to wound blood flow state detection;

The adhesion position of each pair of detection electrodes is 0-10cm away from the edge of the wound;

In each pair of detection electrodes, a line connecting the first detection electrode adhesion position and the first detection electrode adhesion position passes through the wound.

Preferably, the detection part is connected to an alarm system of a peripheral device,

When the detection part determines that the blood flow state is blood leakage, the alarm system of the peripheral device is triggered to give an alarm;

and / or,

When the detection part determines that the blood flow state is thrombus, the alarm system of the peripheral device is triggered to give an alarm.

A blood flow state detection system, comprising: any one of the blood flow state detection equipment described above, a power supply system and an alarm system, wherein,

the power supply system, used to input the first alternating voltage for the blood flow state detection device;

The alarm system is used for alarming when receiving the triggering of the blood flow state detection device.

A blood flow state detection method, each pair of detection electrodes is adhered to the skin surface through an adhesive layer, further comprising:

Each pair of detection electrodes receives an alternating voltage;

Detect the impedance change value in the loop formed by each pair of detection electrodes;

Based on the impedance change value, the blood flow state is determined.

Preferably, the detecting the impedance change value in the loop formed by each pair of detecting electrodes includes: detecting the initial current generated by each pair of detecting electrodes, and detecting the running current of each pair of detecting electrodes in real time;

According to the detected initial current and the corresponding operating current, use the following calculation formula (1) to calculate the impedance change value in the loop formed by each pair of detection electrodes;

in, represents the j-th impedance change value between the n-th pair of detection electrodes detected by the current detector; U represents the alternating voltage output by the alternating voltage supply part; I _n0 represents the initial current of the n-th pair of detection electrodes detected by the current detector; The jth running current value between the nth pair of detection electrodes detected by the I _nj current detector.

Preferably, the above method further comprises: setting a first threshold, a second threshold and a third threshold;

The determining the blood flow state according to the impedance change value includes:

When the impedance change value is smaller than the first threshold value, determining a first number of impedance change values that are continuously smaller than the first threshold value;

Determine whether the first number is greater than the third threshold, and if so, determine blood leakage;

When the impedance change value is greater than the second threshold value, determining a second number of impedance change values that are continuously greater than the second threshold value;

It is judged whether the second number is greater than the third threshold, and if so, blood leakage is determined.

Embodiments of the present invention provide a blood flow state detection device, system, and method. The blood flow state detection device is connected to a corresponding pair of detection electrodes through each pair of alternating voltage ports in the alternating voltage supply unit, to provide The corresponding pair of detection electrodes outputs alternating voltage; and the extreme ends of each pair of detection electrodes contain an adhesive layer, and each pair of detection electrodes can pass through the adhesive layer and adhere to the skin surface. Since the human body is a conductor, then when The two electrodes are adhered to the human body, and the two electrodes and the part of the human body between the two electrodes form a closed circuit, then when a pair of detection electrodes receives the alternating voltage output by the alternating voltage supplying part, a current will pass through The body part located between the two electrodes, and the magnitude of the current is affected by the blood flow state (normal blood flow, leakage blood, and thrombus) in the body part between the two electrodes, that is, the different blood flow states (blood flow (normal, blood leakage and thrombus) generate different impedance values for the closed circuit, then, when the alternating voltage supply part provides alternating voltage for the at least one pair of detection electrodes, the detection part detects the circuit formed by each pair of detection electrodes The impedance change value in the device, according to the impedance change value, determines the blood flow state, and realizes the simultaneous detection of thrombus and blood leakage.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a blood flow state detection device provided by an embodiment of the present invention;

2 is a schematic structural diagram of a blood flow state detection device provided by another embodiment of the present invention;

3 is a schematic structural diagram of a blood flow state detection device provided by another embodiment of the present invention;

4 is a schematic diagram of a blood flow state displayed by a display according to an embodiment of the present invention;

5 is a schematic structural diagram of a blood flow state detection system provided by an embodiment of the present invention;

6 is a flowchart of a blood flow state detection method provided by an embodiment of the present invention;

7 is a schematic structural diagram of a blood flow state detection system provided by another embodiment of the present invention;

FIG. 8 is a flowchart of a blood flow state detection method provided by another embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are protected by the present invention. scope.

As shown in FIG. 1 , an embodiment of the present invention provides a blood flow state detection device. The blood flow state detection device includes: an alternating voltage supply part 101 , at least a pair of detection electrodes 102 and a detection part 103 , wherein,

The alternating voltage supply part 101 includes: at least a pair of alternating voltage ports 1011 , wherein each pair of alternating voltage ports 1011 is connected to a pair of detection electrodes 102 for outputting alternating voltages for the pair of detection electrodes 102 . variable voltage;

The extreme ends of each pair of detection electrodes in the at least one pair of detection electrodes 102 include an adhesive layer 1021;

Each pair of detection electrodes 102 is adhered to the skin surface through the adhesive layer 1021 for receiving the alternating voltage output by the alternating voltage providing part 101;

The detection part 103 is used to detect the impedance change value in the loop formed by each pair of detection electrodes 102 when the alternating voltage supply part 101 provides the alternating voltage to the at least one pair of detection electrodes 102, according to the The impedance change value is used to determine the blood flow state.

In the embodiment shown in FIG. 1 , each pair of alternating voltage ports in the alternating voltage supply part is connected to a corresponding pair of detection electrodes, and an alternating voltage is output for the corresponding pair of detection electrodes; and each pair The extreme end of the detection electrode contains an adhesive layer, and each pair of detection electrodes can pass through the adhesive layer and adhere to the skin surface. Since the human body is a conductor, then when the two electrodes are adhered to the human body, the two electrodes and the two The body part between the electrodes forms a closed circuit, then when a pair of detection electrodes receives the alternating voltage output by the alternating voltage supplying part, a current will flow through the body part between the two electrodes, and the magnitude of the current is affected by the current. Influence of the blood flow state (normal blood flow, leakage blood and thrombus) in the body part between the two electrodes, i.e. different blood flow states (normal blood flow, blood leakage and thrombus) produce different impedance values for the closed circuit , then, when the alternating voltage supply part provides alternating voltage to the at least one pair of detection electrodes, the detection part detects the impedance change value in the loop formed by each pair of detection electrodes, and determines the blood flow state according to the impedance change value , realizing the simultaneous detection of thrombus and blood leakage.

In another embodiment of the present invention, the alternating voltage providing part 101 includes: a transformer (not shown in the figure), wherein,

The transformer, connected to the power supply system of the peripheral device, is used for receiving the first alternating voltage input by the power supply system of the peripheral device, and converting the first alternating voltage into the second alternating voltage;

Each pair of detection electrodes 102 is used for receiving the second alternating voltage output by the alternating voltage supplying part.

Through the above transformer, the 220V voltage of the power supply system of the peripheral device can be converted into a voltage value less than 24V that the human body can bear, such as 10V, 5V, 1V and so on.

In another embodiment of the present invention, in order to ensure that the current passing through the human body is within the acceptable range of the human body, a resistor of a fixed size can also be set between each pair of detection electrodes 102 and the transformer. When the circuit is in use, the generated current is within the range that the human body can withstand.

On the other hand, in order to ensure that the current passing through the human body is within the tolerance range of the human body, an intelligent control switch can also be set between the transformer and each pair of detection electrodes 102 to set a current threshold for the intelligent control switch. When the current threshold is reached, the intelligent control switch is powered off to protect the human body.

As shown in FIG. 2, in another embodiment of the present invention, the detection unit 103 includes: a current detector 201, a calculation subunit 202, and a judgment subunit 203, wherein,

The current detector 201 is used to detect the initial current generated by each pair of detection electrodes 102, and to detect the running current of each pair of detection electrodes 102 in real time;

The calculation sub-unit 202 is used to calculate the impedance change in the loop formed by each pair of detection electrodes 102 according to the initial current detected by the current detector 201 and the corresponding operating current, using the following calculation formula (1). value;

in, represents the j-th impedance change value between the n-th pair of detection electrodes detected by the current detector; U represents the alternating voltage output by the alternating voltage supply part; I _n0 represents the initial current of the n-th pair of detection electrodes detected by the current detector; The jth running current value between the nth pair of detection electrodes detected by the I _nj current detector;

The determination subunit 203 is configured to determine blood leakage when the impedance change value calculated by the calculation subunit 202 is less than zero; when the impedance change value calculated by the calculation subunit 202 is greater than zero, determine the thrombus; When the impedance change value calculated by the calculation subunit 202 is equal to zero, it is determined that the blood flow is normal.

In this embodiment, when the blood flow state detection device is just connected to the human body by default, the current value of each pair of detection electrodes detected by the detection unit is the initial current. The operating current of each pair of detection electrodes is the same as the initial current value. When blood leakage occurs, the blood flow speed is accelerated. Compared with the impedance value generated by the blood flow in the initial state, the impedance value generated by the blood flow in the blood vessel will be reduced. Therefore, in the calculation formula (1), the calculated impedance change value is less than zero, that is, when the impedance change value calculated by the calculation subunit is less than zero, blood leakage is determined. If a thrombus occurs in the blood vessel in the detection part of the detection electrode pair, that is, the blood concentration increases and the blood flow speed slows down, the impedance value generated by the blood flow in the blood vessel will increase compared with the impedance value generated by the blood flow in the initial state. Therefore, in the calculation formula (1), the calculated impedance change value is greater than zero, that is, when the impedance change value calculated by the calculation subunit is greater than zero, the thrombus is determined. Since the current detector detects the running current of each pair of detection electrodes in real time, it is ensured that the blood flow state detection device provided by the embodiment of the present invention can detect blood leakage or thrombus in time, so as to remind the patient or doctor to deal with it in time.

In an embodiment of the present invention, in order to ensure the accuracy of detection, the judging subunit 203 is configured to set a first threshold, a second threshold and a third threshold, and determine the calculation subunit that is continuously smaller than the first threshold The first number of the impedance change value calculated by the unit, determine whether the first number is greater than the third threshold, and if so, determine blood leakage; determine the calculation subunit that is continuously greater than the second threshold The second number of impedance change values obtained by calculation is used to determine whether the second number is greater than the third threshold value, and if so, blood leakage is determined. Due to the influence of the change of the impedance value generated by the skin during the measurement process or other positions in the backflow, or the fluctuation generated by the current detector, it is inevitable that the operating current measured by the current detector will fluctuate. The first threshold, the second threshold and the third threshold set by the subunit avoid current fluctuations caused by external factors. For example: set the first threshold to -10Ω, the second threshold to 10Ω, and the third threshold to 15, and the calculation subunit calculates the mth pair of detection electrodes to generate 15 consecutive impedance changes as {0Ω, -1Ω, 0Ω , -2Ω, -1Ω, 0Ω, -1Ω, 1Ω, 0Ω, -1Ω, 1Ω, -10Ω, -5Ω, 0Ω, -1Ω, 1Ω}, it can be seen from this that the continuous 15 impedance change values If only one reaches the first threshold value -10Ω, the blood flow state is normal in these 15 detection time periods. Another example: another group of continuous impedance changes are {-10Ω, -11Ω, -10Ω, -12Ω, -11Ω, -11Ω, -12Ω, -13Ω, -14Ω, -13Ω, -10Ω, -15Ω, - 15Ω, -16Ω, -15Ω, -16Ω, -10Ω, -11Ω, -12Ω}, and the impedance change value that is less than the first threshold -10Ω reaches 19 consecutively, and exceeds the third threshold value, it means that blood vessels leak blood . In this embodiment of the present invention, a timer may be set to count the number of continuous impedance change values smaller than the first threshold or count the number of continuous impedance change values greater than the second threshold, for example: the counter counts the continuous impedance change values When the number is greater than the second threshold, when the calculation subunit calculates that the second impedance change value is greater than 10Ω, the timer adds 1 to it, and then the calculation subunit calculates the lower value of the second impedance change value. If an impedance change value (the third impedance change value) is less than 10Ω, the impedance change value greater than 10Ω does not appear continuously, and the timer is cleared; when the calculation subunit calculates that the fifth impedance change value is greater than 10Ω, the timer Add 1 to it, and then the calculation subunit calculates that the next change value of the sixth impedance change value (the sixth impedance change value) is still greater than 10Ω, then the timer adds 1 to it, and the counter counts The number is 2; the calculation subunit calculates that the seventh impedance change value is still greater than 10Ω, then the timer adds 1 to it, and the counter statistics are 3 and so on. That is, only when the impedance change value is smaller than the first threshold value, and the impedance change value smaller than the first threshold value lasts for a certain period of time (that is, the number of impedance change values continuously smaller than the first threshold value reaches the third threshold value), blood vessel leakage is determined; When the impedance change value is greater than the third threshold, and the impedance change value greater than the third threshold lasts for a certain period of time (that is, the number of impedance change values continuously greater than the third threshold reaches the third threshold), the blood vessel is determined to have thrombosis, thereby ensuring detection accuracy.

As shown in FIG. 3, in another embodiment of the present invention, the detection part further includes: a signal converter 301 and a display 302, wherein,

The signal converter 301 is configured to convert the impedance change value calculated by the calculation subunit 202 into a corresponding electrical signal, and output the electrical signal to the display 302;

The display 302 is configured to receive the electrical signals output by the signal converter 301, and output the electrical signals in time sequence to form a display waveform. In this embodiment, the signal converter can convert the strength of the corresponding electrical signal according to the magnitude of the impedance change value, for example: the impedance change value is 0Ω, the corresponding signal change value is 0Hz, and the impedance change value is 10Ω, corresponding to The change value of the electrical signal is 20Hz, the impedance change value is -10Ω, and the corresponding electrical signal size is -20Hz, as shown in Figure 4, where Figure 4A is the waveform of the electrical signal displayed on the display when blood leakage occurs; Figure 4 4B is the waveform of the electrical signal displayed by the monitor when blood leakage occurs; that is, when blood leakage occurs, the electrical signal is kept at -20Hz and below for a certain period of time; when thrombus occurs, the electrical signal is kept at 20Hz and above for a certain period of time. .

It is worth noting that, in order to ensure that the difference between the displayed signals of the monitor is obvious, a signal amplifier can be set up between the signal converter and the monitor to amplify the signal, so that the monitor can display the amplified signal, which is convenient for medical staff. Check.

In another embodiment of the present invention, the above-mentioned blood flow state detection device is applied to the detection of the blood flow state of the wound to realize the detection of the blood flow state of the wound, so as to continuously monitor the state of the wound, so as to facilitate the medical staff to deal with the wound in time and ensure the patient safety. In this process, the adhesion position of each pair of detection electrodes is 0-10 cm away from the edge of the wound; the connecting line between the adhesion position of the first detection electrode and the adhesion position of the first detection electrode in each pair of detection electrodes passes through Said wound, this process ensures that the current passes through the wound, so as to realize the detection of the blood flow state of the wound.

In an embodiment of the present invention, in order to remind medical staff or patients in time, the detection part in the blood flow state detection device is connected to an alarm system of a peripheral device; when the detection part determines that the blood flow state is blood leakage, triggering The alarm system of the peripheral device alarms; when the detection unit determines that the blood flow state is thrombus, the alarm system of the peripheral device is triggered to alarm, so that when blood leakage or thrombosis occurs, it can be informed in time, and corresponding nursing care can be carried out .

As shown in FIG. 5 , an embodiment of the present invention provides a blood flow state detection system. The system includes: any of the blood flow state detection devices 501 described above, a power supply system 502 and an alarm system 503 , wherein,

The power supply system 502 is used to input the first alternating voltage for the blood flow state detection device 501;

The alarm system 503 is configured to issue an alarm when a trigger from the blood flow state detection device 501 is received.

As shown in FIG. 6, an embodiment of the present invention provides a blood flow state detection method, and the method may include the following steps:

Step 601: each pair of detection electrodes is adhered to the skin surface through the adhesive layer;

Step 602: each pair of detection electrodes receives an alternating voltage;

Step 603: Detect the impedance change value in the loop formed by each pair of detection electrodes;

Step 604: Determine the blood flow state according to the impedance change value.

Due to the different blood flow states in the blood vessels, the impedance value in the circuit constructed by the blood flow and a pair of detection electrodes will be different, that is, the blood flow state changes, and the impedance value will also change accordingly. The change value can qualitatively determine the change of the blood flow state. For example, when a thrombus is formed, the impedance value will increase, and when blood leaks, the impedance value will decrease, thereby realizing the simultaneous detection of blood leakage and thrombus.

In an embodiment of the present invention, in order to obtain the impedance change value in the loop formed by each pair of detection electrodes, the specific implementation of step 603 includes: detecting the initial current generated by each pair of detection electrodes, and detecting each pair of detection electrodes in real time. The operating current of a pair of detection electrodes; and according to the detected initial current and the corresponding operating current, using the following calculation formula (1), calculate the impedance change value in the loop formed by each pair of detection electrodes;

in, represents the j-th impedance change value between the n-th pair of detection electrodes detected by the current detector; U represents the alternating voltage output by the alternating voltage supply part; I _n0 represents the initial current of the n-th pair of detection electrodes detected by the current detector; The jth running current value between the nth pair of detection electrodes detected by the I _nj current detector.

Since the above process is to detect the running current of each pair of detection electrodes in real time, such as detecting the running current every 1s, the real-time change of the impedance change value in the loop can be obtained by calculating formula (1), thereby ensuring the accuracy of the detection.

In an embodiment of the present invention, in order to ensure the accuracy of the blood flow state determination, the above method further includes: setting a first threshold, a second threshold and a third threshold; a specific implementation of step 604 includes: when the impedance When the change value is smaller than the first threshold, determine the first number of impedance change values that are continuously smaller than the first threshold; determine whether the first number is greater than the third threshold, and if so, determine blood leakage ; When the impedance change value is greater than the second threshold, determine the second number of impedance change values that are continuously greater than the second threshold; determine whether the second number is greater than the third threshold, if Yes, blood leakage is determined. Since the impedance change value is obtained in real time, only when the impedance change value is outside a certain threshold value for a continuous period of time can it be determined as blood leakage or thrombosis, and the individual impedance change value outside a certain threshold value may be due to detection, etc. It is caused by the error generated by the process. Therefore, through this embodiment, the number of continuous impedance change values outside the threshold (the number of impedance change values less than the first threshold value, or the impedance change value greater than the first threshold value) As the duration consideration, the blood state is determined by two parameters, the magnitude of the impedance change value and the duration, so as to ensure the accuracy of determining the blood state.

In an embodiment of the present invention, in order to more intuitively display the change of the impedance change value with the detection time, the above method further includes: converting the calculated impedance change value into a corresponding electrical signal, and outputting it in a chronological order through the display The electrical signal forms a display waveform, and the medical staff can clearly see the change of the impedance change value through the change of the waveform, so as to obtain the change of the blood flow state intuitively.

In an embodiment of the present invention, the above-mentioned blood flow state detection method is applied to wound blood flow state detection; the adhesion position of each pair of detection electrodes is 0-10 cm away from the edge of the wound; the first detection method in each pair of detection electrodes The connection line between the electrode adhesion position and the first detection electrode adhesion position passes through the wound, so as to ensure that the current passes through the wound, and realize the detection of the blood flow state of the wound.

It should be noted that the above process is implemented in the state of alternating voltage, which can avoid the influence on the blood flow state.

Taking the blood flow state detection system shown in FIG. 7 to detect the blood flow state of a wound as an example, the blood flow state detection method is explained. As shown in FIG. 8 , the blood flow state detection method may include the following steps:

Step 800: Connect the blood flow state detection device to the power supply system and the alarm system respectively;

As shown in FIG. 7 , the blood flow state detection system includes: a blood flow state detection device 701, a power supply system 702 and an alarm system 703, wherein the blood flow state detection device 701 includes at least one pair of detection electrodes. In this embodiment of the present invention, Take two pairs of electrodes as an example, namely, the electrode pair 1 (electrode a and electrode b) marked as 7011 and the electrode pair 2 (electrode c and electrode d) marked as 7012 shown in FIG. A positive electrode and a negative electrode are included. Since the power supply system 702 provides an alternating voltage, the positive electrode and the negative electrode in each pair of electrodes change with the change of the alternating voltage. Since the voltage of the current power supply system is generally 220V, in order to realize the output of human safety voltage for the above-mentioned two pairs of electrodes 7011 and 7012, a transformer 7013 is set between the two pairs of electrodes 7011 and 7012 and the power supply system. To detect the current in the circuit formed with the wound, the blood flow state detection device 701 includes a detection unit 7015, and the detection unit 7015 includes: a current detector 70151, a calculation subunit 70152, a judgment subunit 70153, and a signal converter 70154 and the display 70155, the detection of the blood state is realized by each subunit in the detection part 7015, and the specific connection method can be seen intuitively from FIG. 7, and will not be repeated here.

Step 801: Set a first threshold, a second threshold and a third threshold;

The first threshold set in this step is the blood leakage threshold, that is, when the impedance change value is less than the first threshold, it indicates that blood leakage may occur in the wound, and the second threshold is the thrombus threshold, that is, when the impedance change value is greater than the second threshold When the threshold value is set, it means that there may be thrombosis in the wound, and the determination of blood leakage and thrombosis still needs to pass the third threshold value, that is, when the number of impedance change values that are continuously smaller than the first threshold value reaches the third threshold value, it means that the wound occurs. Blood leakage situation; when the number of impedance change values that are continuously greater than the second threshold value reaches the third threshold value, it means that there is a thrombus in the wound.

Step 802: Adhering at least one pair of detection electrodes in the blood flow state detection device to the skin surface around the wound through the adhesive layer;

As shown in FIG. 7 , two pairs of detection electrodes 7011 and 7012 are respectively attached around the wound 704, and at the same time, the adhesion position of each pair of detection electrodes is 0-10 cm away from the edge of the wound to ensure the accuracy of wound detection. , the connection line between the first detection electrode adhesion position and the first detection electrode adhesion position in each pair of detection electrodes passes through the wound. As can be seen from FIG. 7 , the connection line L between the detection electrode a and the detection electrode b in the detection electrode pair 7011 passes through the wound 704; the connection P between the detection electrode c and the detection electrode d in the detection electrode pair 7012 passes through the wound 704; thus ensuring that Accuracy of wound detection.

Step 803: Receive the first alternating voltage output by the power supply system through the transformer in the blood flow state detection device;

Step 804: the transformer converts the first alternating voltage into a second alternating voltage, and outputs the second alternating voltage to each pair of detection electrodes;

The process of the above steps 803 and 804 is the process of inputting alternating voltages for the three pairs of detection electrodes shown in FIG.

Step 805: Detect the initial current of the loop formed by each pair of detection electrodes through the detection unit in the blood flow state detection device;

The initial current in this step is by default the detection electrode pair and the wound forming a loop. When the second alternating voltage is just received, the first value detected by the detection unit is actually the first value detected by the detection unit. If the blood flow state is relatively stable at the initial stage, the current generated by the relatively stable blood flow state at the initial stage can be used as the initial current.

Step 806: Detect the running current of the loop formed by each pair of detection electrodes in real time;

The real-time detection is to ensure the integrity of the running current acquisition, for example, the running current is detected every 1s or every 0.5s.

Step 807: Calculate the impedance change value of the loop formed by each pair of detection electrodes according to the initial current and the operating current;

In this step, the calculation process is mainly completed by using the following calculation formula (1).

in, represents the j-th impedance change value between the n-th pair of detection electrodes detected by the current detector; U represents the alternating voltage output by the alternating voltage supply part; I _n0 represents the initial current of the n-th pair of detection electrodes detected by the current detector; The jth running current value between the nth pair of detection electrodes detected by the I _nj current detector.

Step 808: Convert the impedance change value into a corresponding electrical signal;

Step 809: Output the electrical signals in time sequence to form a display waveform, and display the display waveform through the display. When the impedance change value is less than the first threshold, execute step 810, and when the impedance change value is greater than the second threshold, execute step 809 813;

The above steps 808 and 809 are mainly for the purpose of visually displaying the impedance change value in the form of a waveform diagram, so as to provide a reference for medical staff to perform wound treatment. The above presentation process is mainly that the signal converter 70154 shown in FIG. 7 converts the impedance change value into the corresponding electrical signal strength. For example, when the impedance change value is 0Ω, the corresponding signal strength is 0Hz; when the impedance change value is 12Ω, the corresponding signal strength is 0Hz. The signal strength is 24Hz and so on. And through the display 70155, the change of the signal intensity with the extension of the detection time is displayed. Since the impedance change value may be relatively small, in order to ensure the obviousness of the display, a signal amplifier can also be set between the signal converter 70154 and the display 70155 to amplify the strength of the signal output by the signal converter 70154 by a certain multiple, so that the display 70155 can display The waveform is clearer.

Step 810: Count the first number of impedance change values that are continuously smaller than the first threshold;

The number of impedance change values that are continuously smaller than the first threshold will directly determine whether the wound is leaking blood. For example, if the number of impedance change values less than the first threshold is 1, it may be an occasional detection error, which does not explain During blood leakage, when the fifth impedance change value is detected to be smaller than the first threshold, the sixth impedance change value, seventh impedance change value, and eighth impedance change value are all smaller than the first threshold value, but the ninth impedance change value is smaller than the first threshold value. If the change value is greater than the first threshold value, the number of impedance change values that are continuously smaller than the first threshold value is 4; for another example: from the 100th impedance change value to the 115th impedance change value is smaller than the first threshold value, then the continuous value is less than the first threshold value. The number of impedance change values of the first threshold is 16.

Step 811: Determine whether the first number is not less than the third threshold, if so, go to Step 812, otherwise, go to Step 810;

For example: the set third threshold value is 15; then in the above step 810, when the number of impedance change values that are continuously smaller than the first threshold value is 4, and 4 is smaller than 15, it means that there is no blood leakage; When the number of impedance change values is 16, if 16 is greater than 15, it means blood leakage, and the blood leakage alarm is performed through the alarm system, so that the medical staff can deal with the wound in time and ensure the safety of the patient.

Step 812: determine that blood leakage occurs in the wound, trigger the alarm system to alarm for blood leakage, and end the current process;

Step 813: Count the second number of impedance change values that are continuously greater than the second threshold;

Step 814: Determine whether the second number is not less than the third threshold, if so, go to Step 815, otherwise, go to Step 813;

In the process of the above steps 813 and 814: the number of impedance change values that are continuously greater than the second threshold will directly determine whether thrombosis occurs in the wound. For example, when the number of impedance change values greater than the second threshold is 1, it may be Occasional detection errors do not mean the occurrence of thrombus. When the 200th impedance change value is detected to be greater than the second threshold, the 201st impedance change value, the 202nd impedance change value, and the 203rd impedance change value are all smaller than the first threshold value. , however, if the 204th impedance change value is smaller than the second threshold value, the number of impedance change values continuously greater than the second threshold value is 4; For the second threshold, the number of impedance change values that are continuously greater than the second threshold is 16. For example: the set third threshold is 15; then when the number of impedance change values that are continuously greater than the second threshold is 4, and 4 is less than 15, it means that there is no thrombus in the wound; When the number is 16, if 16 is greater than 15, it means that there is a thrombus in the wound, and the blood leakage alarm is issued through the alarm system, so that the medical staff can deal with the wound in time and ensure the safety of the patient.

Step 815: It is determined that thrombus occurs in the wound, and the alarm system is triggered to alarm for thrombus.

According to the above scheme, each embodiment of the present invention has at least the following beneficial effects:

1. Each pair of alternating voltage ports in the alternating voltage supply part is connected to a corresponding pair of detection electrodes to output alternating voltages for the corresponding pair of detection electrodes; and the extreme ends of each pair of detection electrodes include an adhesive layer , each pair of detection electrodes can be adhered to the skin surface through the adhesive layer. Since the human body is a conductor, then when the two electrodes are adhered to the human body, the two electrodes and the part of the human body between the two electrodes are closed. circuit, then when a pair of detection electrodes receive the alternating voltage output by the alternating voltage supplying part, a current will flow through the body part between the two electrodes, and the magnitude of the current is affected by the body part between the two electrodes. The influence of the blood flow state (normal blood flow, blood leakage and thrombus) in When the at least one pair of detection electrodes is provided with alternating voltage by the detection part, the impedance change value in the circuit formed by each pair of detection electrodes is detected by the detection part, and the blood flow state is determined according to the impedance change value, thereby realizing the simultaneous detection of thrombus and leakage. Blood.

2. In the embodiment of the present invention, the voltage of the power supply system is converted into a voltage that the human body can withstand through a transformer. Then, during the detection process, the voltage input to the human body by each pair of detection electrodes is a voltage value that the human body can withstand, thereby ensuring that Security of the inspection process.

3. By detecting the initial current generated by each pair of detection electrodes, and real-time detection of the operating current of each pair of detection electrodes, and according to the initial current detected by the current detector and the corresponding operating current, calculate the current formed by each pair of detection electrodes. The impedance change value in the loop; and by setting the first threshold value and the second threshold value for the impedance change value, and setting the third threshold value for the number of impedance change values, that is, when the impedance change value is less than the first threshold value, and at the same time, it is continuously less than When the number of impedance change values of the first threshold reaches the third threshold, it is determined to be blood leakage; when the impedance change value is greater than the second threshold, and at the same time, the number of impedance change values continuously greater than the second threshold reaches the third threshold, then It is determined to be a thrombus, thereby ensuring the accuracy of detecting blood leakage and thrombus.

4. Convert the calculated impedance change value into a corresponding electrical signal through the signal converter, and output the electrical signal to the display, and through the display, it is used to receive the electrical signal output by the signal converter, and output the electrical signal in time sequence. signal, forming a display waveform, so that the change of the impedance change value with the detection time can be more intuitively displayed.

5. By attaching each pair of detection electrodes in the blood flow state detection device to a distance of 0-10 cm from the edge of the wound; The connection line passes through the wound to realize the detection of the blood state of the wound.

6. By connecting the blood flow state detection equipment with the alarm system, when blood leakage or thrombosis is determined, the alarm system is triggered to alarm, so that the blood leakage or thrombosis can be alarmed, so that medical staff can take emergency measures or carry out timely treatment. The wound treatment further ensures the safety of the patient.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply a relationship between these entities or operations. There is no such actual relationship or sequence. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, the inclusion of an element by the phrase "comprising a..." does not preclude the presence of additional such elements in the process, method, article or apparatus that includes the element.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by program instructions related to hardware, the aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, execute It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other mediums that can store program codes.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, but not to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (6)

1. A blood flow state detection apparatus characterized by comprising: an alternating voltage supply unit, at least one pair of detection electrodes, and a detection unit,

the alternating voltage supply section includes: at least one pair of alternating voltage ports, wherein each pair of alternating voltage ports is connected with a pair of detection electrodes and is used for outputting alternating voltage for the pair of detection electrodes;

the extreme end of each of the at least one pair of detection electrodes comprises an adhesion layer;

each pair of detection electrodes is adhered to the surface of the skin through the adhesive layer and used for receiving the alternating voltage output by the alternating voltage supply part;

the detection part is used for detecting an impedance change value in a loop formed by each pair of detection electrodes when the alternating voltage supply part supplies alternating voltage to the at least one pair of detection electrodes, and determining the blood flow state according to the impedance change value;

the detection section includes: the device comprises a current detector, a calculating subunit and a judging subunit, wherein the current detector is used for detecting initial current generated by each pair of detection electrodes and detecting the operating current of each pair of detection electrodes in real time;

the calculating subunit is configured to calculate, according to the initial current and the corresponding operating current detected by the current detector, an impedance change value in a loop formed by each pair of detection electrodes by using a first calculation formula;

wherein,characterizing a j-th impedance change value between the n-th pair of detection electrodes detected by the current detector; u represents the alternating voltage output by the alternating voltage supply part; i is_n0Characterizing an initial current of the nth pair of sensing electrodes sensed by the current sensor; i is_njThe j operation current value between the n pair of detection electrodes detected by the current detector;

the judgment subunit is used for determining blood leakage when the impedance change value calculated by the calculation subunit is less than zero; when the impedance change value calculated by the calculating subunit is larger than zero, determining the thrombus; and when the impedance change value calculated by the calculating subunit is equal to zero, determining that the blood flow is normal.

2. The blood flow state detection apparatus according to claim 1, wherein the alternating voltage supply section includes: a transformer, wherein,

the transformer is connected with an external power supply system and used for receiving a first alternating voltage input by the external power supply system and converting the first alternating voltage into a second alternating voltage;

each pair of detection electrodes is used for receiving the second alternating voltage output by the alternating voltage supply part.

3. The blood flow state detection apparatus according to claim 1, wherein the judgment subunit is configured to set a first threshold value, a second threshold value, and a third threshold value, the first threshold value is a blood leakage threshold value, the second threshold value is a thrombus threshold value, determine the number of impedance change values calculated by the calculation subunit that are successively smaller than the first threshold value, judge whether the number reaches the third threshold value, and if so, determine blood leakage; determining the number of impedance change values obtained by calculation of the calculation subunit continuously larger than the second threshold, judging whether the number reaches the third threshold, and if so, determining that thrombus occurs;

and/or the presence of a gas in the gas,

the detection section further includes: a signal converter and a display, wherein,

the signal converter is used for converting the impedance change value obtained by the calculation of the calculating subunit into a corresponding electric signal and outputting the electric signal to the display;

and the display is used for receiving the electric signals output by the signal converter and outputting the electric signals according to a time sequence to form a display waveform.

4. The blood flow state detection apparatus according to any one of claims 1 to 3, applied to wound blood flow state detection;

the adhesion position of each pair of detection electrodes is 0-10cm away from the wound edge;

the line connecting the first detection electrode adhesion position and the first detection electrode adhesion position in each pair of detection electrodes passes through the wound.

5. The blood flow state detection apparatus according to any one of claims 1 to 3, wherein the detection portion is connected to an external alarm system,

when the detection part determines that the blood flow state is blood leakage, the peripheral alarm system is triggered to alarm;

and/or the presence of a gas in the gas,

and when the detection part determines that the blood flow state is thrombus, triggering an alarm system of the peripheral equipment to alarm.

6. A blood flow condition detection system, comprising: the blood flow state detecting apparatus, the power supply system, and the alarm system according to any one of claims 1 to 5,

the power supply system is used for supplying a first alternating voltage to the blood flow state detection equipment;

and the alarm system is used for giving an alarm when receiving the trigger of the blood flow state detection equipment.