A peripheral circulation function evaluation device based on bioelectrical impedance detection

Abstract

The application discloses a kind of based on biological electrical impedance detection peripheral circulation function evaluation device, comprising: airbag finger sleeve, electrode, air pump and control evaluation device.This device compared with other detection devices innovative use electrical impedance detection method, reliable result;Its simple structure, convenient operation, not affected by using environment;In addition to be applicable to routine patient, it can also be applicable to critical patients, neonates and other patients with poor cooperation ability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical devices, and particularly relates to a peripheral circulation function evaluation device based on bioelectrical impedance detection. BACKGROUND

[0002] Microcirculation is the bridge connecting macrocirculation and cells, normal microcirculation and tissue perfusion are the key to guarantee cell respiration and energy metabolism and the basis for maintaining the function of tissues and organs, and microcirculation disorder is usually manifested as reduced skin temperature, abnormal skin color, increased central-peripheral temperature gradient, etc., and if effective monitoring and intervention are not implemented in time, a series of symptoms will be caused, such as multiple organ failure, and even life-threatening.

[0003] At present, the technology for directly observing microcirculation has not been popularized, and in clinical practice, indicators related to oxygen and carbon dioxide metabolism, such as lactic acid, central venous oxygen saturation, arteriovenous carbon dioxide partial pressure difference and gastric mucosal pH value monitoring, are used to indirectly reflect the microcirculation state, and there is a lack of intuitive and real-time method for monitoring the microcirculation state.

[0004] Peripheral blood circulation of skin and muscle is defined as peripheral circulation, and the latest Beijing consensus on critical care hemodynamic therapy points out that peripheral circulation is close to microcirculation. Capillary refill time (CRT) is the most convenient and commonly used observation index for evaluating peripheral circulation function, and in 2011, the CRT measurement method described in the American Pediatric Advanced Life Support Guidelines is specifically described as follows: the end of the limb is raised to be higher than the heart level, the skin of the end of the limb is pressed and then quickly released, and the time required for the skin to restore its original color is observed. Peripheral circulation is a part of peripheral circulation, and the evaluation of peripheral circulation function at the end of the limb by the CRT method can reflect the state of microcirculation. SUMMARY

[0005] The purpose of the present application is to overcome the defects of the prior art, and provide a peripheral circulation function evaluation device based on bioelectrical impedance detection, which can be used to evaluate the peripheral circulation function by the detected capillary refill time and the change of electrical impedance value before and after compression.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme: a peripheral circulation function evaluation device based on bioelectrical impedance detection, comprising: an airbag finger sleeve, an electrode, an air pump and a control evaluation device.

[0007] The electrode is arranged in the airbag finger sleeve and is used to be fitted on the fingertip of a measured person, the electrode is attached to the skin of the fingertip, the airbag is inflated or deflated by the air pump to compress the capillary vessels of the fingertip or to restore the filling of the vessels.

[0008] The electrode is used to detect the electrical impedance of the finger before and after inflation after being attached to the skin of the finger, and to send the real-time monitoring electrical impedance value to the control evaluation device;

[0009] The control evaluation device is used to control the inflation and deflation of the air pump to the air bag finger sleeve, record the pressure value, receive the real-time electrical impedance value, and evaluate the peripheral circulation function of the measured person according to the detected capillary refill time and the change of the electrical impedance value before and after compression.

[0010] Further, the air bag finger sleeve comprises a shell and a three-section air bag; the inside of the shell is a cavity, one end is open, the three-section air bag is arranged in the shell, the air bag is connected as a whole and divided into three sections, the first section and the third section are arranged on both sides of the shell cavity, and the second section is arranged at the bottom of the shell cavity. The three-section air bag is connected with the air pump through the control evaluation device and the air guide pipe, and the three-section air bag is attached to the back of the finger joint, the top of the finger and the inside of the finger joint, respectively.

[0011] Further, a pressure sensor is arranged in the air bag.

[0012] Further, the electrode comprises a first electrode, a second electrode and a third electrode, which are respectively fixed on one side of the three-section air bag facing the limb end, and are respectively attached to the back of the second finger joint, the inside of the second finger joint and the inside of the first finger joint after the air bag is inflated.

[0013] Further, the control evaluation device comprises an excitation signal output unit, a signal detection unit, a main control unit, a display screen and a key;

[0014] The excitation signal output unit is used to send excitation signals to different electrodes in turn in each detection cycle, and the electrodes receiving the excitation signals are used as excitation electrodes, and the remaining electrodes are used as detection electrodes.

[0015] The signal detection unit is used to receive the real-time monitoring electrical impedance signal of the detection electrode and convert it into an electrical impedance value; six electrical impedance values are obtained in each detection cycle, and the electrical impedance between each two electrodes corresponds to two electrical impedance values, and the average value is taken as the electrical impedance value between the two electrodes. The electrical impedance value between the first electrode and the second electrode is denoted as R I , the electrical impedance value between the first electrode and the third electrode is denoted as R V , and the electrical impedance value between the second electrode and the third electrode is denoted as R H ;

[0016] The main control unit is used to control the inflation and deflation of the air pump to the air bag finger sleeve, and calculate the refill rate a and the recovery rate REC according to the detected capillary refill time and the change of the electrical impedance value before and after compression, so as to evaluate the peripheral circulation function of the measured person;

[0017] The display screen is used to display the detection data and the evaluation result.

[0018] The key is used to start and close the entire control evaluation device.

[0019] Further, the host unit detects the capillary refill time and the change of the electrical impedance value before and after compression by the following steps: starting the air pump to inflate the air bag, one of the three electrodes as the excitation electrode, and the other two detection electrodes can detect the electrical impedance signal, then it is considered that the wearing is completed.

[0020] The three electrical impedance values obtained in the first detection cycle are taken as the pre-compression electrical impedance values, respectively denoted as R I1 , R V1 and R H1 , and the current air bag pressure is taken as the pressure threshold value.

[0021] The air bag is continuously inflated until the three detected electrical impedance values are no longer significantly changed, then it is considered that the compression is completed, and after 2 seconds of continuous compression, the three detected electrical impedance values are taken as the electrical impedance values in compression, respectively denoted as R I2 , R V2 and R H2 , and the air bag pressure is taken as the pressure peak value.

[0022] The air bag is rapidly deflated to release the pressure, and when the air bag pressure drops to the pressure threshold value, the deflation is stopped, and the air bag pressure value is maintained as the pressure threshold value. The air bag starts to deflate at the same time, and the change of the electrical impedance value is recorded as the post-release electrical impedance value, respectively denoted as R I3 , R V3 and R H3 . The time required for the post-release electrical impedance value to return to the pre-compression electrical impedance value or the post-release electrical impedance value to reach a stable level is taken as the capillary refill time T, and the detection is completed.

[0023] Further, the calculation formulas of the refill rate a and the recovery rate REC are shown in formulas 1 and 2:

[0024]

[0025]

[0026] Further, the control evaluation device further comprises a power supply unit for providing power to the entire control evaluation device.

[0027] Compared with the traditional CTR method, the device has the following advantages:

[0028] (1) The air bag compression replaces the finger squeezing, the pressure is more accurate, the compression time is more accurate, and the result deviation caused by the deviation during operation is avoided.

[0029] (2) The method of electrical impedance detection is used to replace human eye observation, and the obtained result is more objective and reliable, and the deviation of the result caused by factors such as observation angle, environmental light and visual difference of the observer is avoided.

[0030] (3) The device uses the electrical impedance detection method, and the result is reliable; the structure is simple, the operation is convenient, and the device is not affected by the use environment; in addition to being suitable for conventional patients, the device can also be suitable for critically ill patients, neonates and other patients with poor cooperation ability.

[0031] (4) The device is non-invasive and painless, has fast detection speed and good use experience. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic diagram of an embodiment of a peripheral circulation function evaluation device. DETAILED DESCRIPTION

[0033] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0034] It should be noted that the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0035] As shown in Figure 1 A peripheral circulation function evaluation device based on bioelectrical impedance detection, comprising: an airbag finger sleeve, an electrode, an air pump 1 and a control evaluation device.

[0036] The airbag finger sleeve comprises a shell 2 and a three-section airbag 3. The shell is made of hard material, the inside is a cavity, one end is open, the three-section airbag is arranged inside the shell, the whole airbag is connected and divided into three sections, the first section and the third section are arranged on both sides of the shell cavity, and the second section is arranged at the bottom of the shell cavity. The three-section airbag is connected with the air pump through a gas guide pipe and the control evaluation device, and the three-section airbag is respectively attached to the back of the finger joint, the top of the finger and the inside of the finger joint. A pressure sensor is arranged in the airbag for detecting the pressure of the airbag.

[0037] The electrode is arranged in the air bag finger sleeve, and is used for detecting the electrical impedance of the finger before and after inflation after being attached to the skin of the finger, and sending the real-time monitoring electrical impedance value to the control evaluation device. The electrode includes a first electrode 4, a second electrode 5 and a third electrode 6, which are respectively fixed on one side of the three-section air bag facing the limb end, and are respectively attached to the back side of the second knuckle, the inner side of the second knuckle and the inner side of the first knuckle after the air bag is inflated. The electrode is attached to the surface skin of the finger, and the air bag is inflated or deflated by the air pump, so that the air bag compresses the capillary vessels of the finger or restores the filling of the vessels.

[0038] The control evaluation device includes an excitation signal output unit, a signal detection unit, a main control unit, a display screen and a key. The excitation signal output unit is used for sequentially sending excitation signals to different electrodes in each detection cycle, and the electrodes receiving the excitation signals are used as excitation electrodes, and the remaining electrodes are used as detection electrodes; the signal detection unit is used for receiving the electrical impedance signals monitored by the detection electrodes in real time, and converting the electrical impedance signals into electrical impedance values; six electrical impedance values are obtained in each detection cycle, and the electrical impedance between each two electrodes corresponds to two electrical impedance values, and the average value of the two electrical impedance values is taken as the electrical impedance value between the two electrodes; the electrical impedance value between the first electrode and the second electrode is recorded as R I , the electrical impedance value between the first electrode and the third electrode is recorded as R V , and the electrical impedance value between the second electrode and the third electrode is recorded as R H ; the main control unit is used for controlling the inflation and deflation of the air pump to the air bag finger sleeve, and calculating the refilling rate α and the recovery rate REC according to the detected capillary refilling time and the change of the electrical impedance values before and after compression, so as to evaluate the peripheral circulation function of the measured person; the display screen is used for displaying the detection data and the evaluation result; and the key is used for starting and closing the whole control evaluation device.

[0039] The air pump, the recording signal output unit, the signal detection unit, the main control unit, the display screen 7 and the key 8 are all integrated in a selection control panel 9. The guide tube and the electrode lead wire form a connection line pipe 10.

[0040] The main control unit detects the capillary refilling time and the change of the electrical impedance values before and after compression by the following steps:

[0041] (1) Start the air pump to inflate the air bag, one of the three electrodes is used as an excitation electrode, and the other two electrodes can detect the electrical impedance signals, then it is considered that the wearing is completed;

[0042] (2) The three electrical impedance values obtained in the first detection cycle are taken as the electrical impedance values before compression, and are recorded as R I1 , R V1 and R H1 , respectively, and the current air bag pressure is taken as the pressure threshold value;

[0043] (3) continuously inflate the air bag until the three detected electrical impedance values are no longer obviously changed, then consider that the compression is completed, and after 2 seconds of continuous compression, take the three detected electrical impedance values as the electrical impedance values in the compression, and record them as R I2 , R V2 and R H2 , respectively, and take the air bag pressure as the pressure peak value;

[0044] (4) quickly deflate the air bag to release the pressure, and stop deflation when the air bag pressure drops to the pressure threshold value, and maintain the air bag pressure value as the pressure threshold value, start timing and record the change of the electrical impedance value at the same time when the air bag starts to deflate, and record the electrical impedance value after release as R I3 , R V3 and R H3 , respectively, and take the time required for the electrical impedance value after release to return to the electrical impedance value before compression or to reach a stable level as the capillary refill time T, and the detection is completed.

[0045] The calculation formulas of the refill rate α and the recovery rate REC are shown in formulas 1 and 2:

[0046]

[0047]

[0048] The refill rate α is the amount of change of the electrical impedance caused by the vascular refill in a unit of time. The greater the value of α, the greater the rate of vascular refill and the better the peripheral circulation function, and correspondingly, the smaller the value of α, the worse the peripheral circulation function.

[0049] The recovery rate REC is the deviation rate of the detected electrical impedance before compression and after release, and is used to represent the ability of the blood vessels to return to the state before compression. The greater the value of REC, the smaller the deviation of the detected electrical impedance before compression and after release, and the stronger the ability of the blood vessels to return to the state before compression, that is, the stronger the peripheral circulation function, and correspondingly, the smaller the value of REC, the greater the deviation of the detected electrical impedance before compression and after release, and the weaker the ability of the blood vessels to return to the state before compression, that is, the weaker the peripheral circulation function.

[0050] The three electrodes are respectively used as excitation electrodes, in order to ensure that the three electrodes can be detected to be attached to the extremity. In the subsequent detection, multiple groups of data measured in each cycle are averaged. The purpose is to reduce the deviation caused by errors and interference.

[0051] The control evaluation device can further include a power supply unit for providing power to the entire control evaluation device.

[0052] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A device for evaluating peripheral circulation function based on bioelectrical impedance detection, characterized in that The utility model relates to a kind of peripheral circulation function evaluation device, including: Airbag finger sleeve, electrode, air pump and control evaluation device; Wherein the airbag finger sleeve is provided with electrode, for being worn on the fingertip of the person to be measured, electrode is attached to the skin of finger surface, and airbag is inflated or deflated by air pump, so that airbag compresses capillary vessels or makes blood vessel restore fullness; The electrode is used to detect the electrical impedance of the finger before and after inflation after attaching to the skin of finger, and send real-time monitoring electrical impedance value to control evaluation device; The control evaluation device is used to control air pump to inflate and deflate airbag finger sleeve, record pressure value, receive real-time electrical impedance value, and evaluate peripheral circulation function of the person to be measured according to detected capillary reperfusion time and the change of electrical impedance value before and after compression; The airbag finger sleeve includes shell and three-section airbag;The inside of the shell is cavity, one end is open, and the three-section airbag is arranged in the shell, and the whole airbag is connected and divided into three sections, the first section and the third section are arranged on both sides of the cavity of the shell, and the second section is arranged at the bottom of the cavity of the shell, and the three-section airbag is connected with air pump through control evaluation device and air guide pipe, and the three-section airbag is attached to the dorsal side of the second knuckle, the top end of the finger and the medial side of the second knuckle respectively; Pressure sensor is arranged in the airbag; The electrode includes first electrode, second electrode and third electrode, which are fixed on one side of the three-section airbag facing the limb end, and are attached to the dorsal side of the second knuckle, the medial side of the second knuckle and the medial side of the first knuckle respectively after inflation of the airbag; The control evaluation device includes excitation signal output unit, signal detection unit, main control unit, display screen and button; The excitation signal output unit is used to send excitation signal to different electrodes in each detection cycle, and the electrode receiving excitation signal is used as excitation electrode, and the rest electrodes are used as detection electrodes to detect signal; The signal detection unit is used for receiving the electrical impedance signal monitored by the detection electrode in real time and converting into an electrical impedance value; 6 electrical impedance values are obtained in each detection cycle, 2 electrical impedance values corresponding to the electrical impedance between each two electrodes, and the average value of the two is taken as the electrical impedance value between the two electrodes; the electrical impedance value between the first electrode and the second electrode is recorded as R I , the electrical impedance value between the first electrode and the third electrode is recorded as R V , and the electrical impedance value between the second electrode and the third electrode is recorded as R H . The main control unit is used to control air pump to inflate and deflate airbag finger sleeve, and calculate reperfusion rate α and recovery rate REC according to detected capillary reperfusion time and the change of electrical impedance value before and after compression, to evaluate peripheral circulation function of the person to be measured; The display screen is used to display detection data and evaluation results; The button is used to start and close the whole control evaluation device; The main control unit detects capillary reperfusion time and the change of electrical impedance value before and after compression by the following steps: Start air pump to inflate airbag, one of the three electrodes is used as excitation electrode, and the other two electrodes can detect electrical impedance signal, then it is considered that wearing is completed; The three electrical impedance values obtained in the first detection cycle are taken as the pre-compression electrical impedance values, denoted as R I1 , R V1 , and R H1 , respectively, and the current air bag pressure is taken as the pressure threshold value; The airbag is continuously inflated until the three detected electrical impedance values are no longer obviously changed, and it is considered that the compression is completed. After 2 seconds of continuous compression, the three currently detected electrical impedance values are taken as the electrical impedance values in compression, and are respectively recorded as R I2 , R V2 , and R H2 . The airbag pressure is taken as the pressure peak value; The air bag is rapidly deflated to release pressure, and when the air bag pressure falls to a pressure threshold, the deflation is stopped and the air bag pressure value is maintained at the pressure threshold. The air bag starts to deflate at the same time as the timer starts and records the change in electrical impedance value, which is recorded as the post-release electrical impedance value, denoted as R I3 , R V3 , and R H3 . The post-release electrical impedance value is restored to the pre-compression electrical impedance value or the time required for the post-release electrical impedance value to reach a stable level is taken as the capillary refill time T, and the detection is completed. The calculation formula of reperfusion rate α and recovery rate REC is shown as formula 1 and 2: （1） （2）。 2. The bioelectrical impedance detection based peripheral circulation function evaluation device according to claim 1, characterized in that: The control evaluation device further includes power supply unit, which is used to provide electric energy for the whole control evaluation device.

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