CN112155600A - Wearable arteriovenous internal fistula blood flow monitoring device and system - Google Patents
Wearable arteriovenous internal fistula blood flow monitoring device and system Download PDFInfo
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- CN112155600A CN112155600A CN202010922729.XA CN202010922729A CN112155600A CN 112155600 A CN112155600 A CN 112155600A CN 202010922729 A CN202010922729 A CN 202010922729A CN 112155600 A CN112155600 A CN 112155600A
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- 230000017531 blood circulation Effects 0.000 title claims abstract description 99
- 206010016717 Fistula Diseases 0.000 title claims abstract description 73
- 230000003890 fistula Effects 0.000 title claims abstract description 73
- 238000012806 monitoring device Methods 0.000 title claims abstract description 27
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 32
- 238000012544 monitoring process Methods 0.000 claims abstract description 25
- 206010003226 Arteriovenous fistula Diseases 0.000 claims abstract description 16
- 210000004369 blood Anatomy 0.000 claims description 19
- 239000008280 blood Substances 0.000 claims description 19
- 210000000601 blood cell Anatomy 0.000 claims description 14
- 210000002381 plasma Anatomy 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 10
- 210000003205 muscle Anatomy 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 210000003462 vein Anatomy 0.000 claims description 8
- 210000004204 blood vessel Anatomy 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 2
- 208000007536 Thrombosis Diseases 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 3
- 238000001631 haemodialysis Methods 0.000 description 3
- 230000000322 hemodialysis Effects 0.000 description 3
- 208000024891 symptom Diseases 0.000 description 2
- 208000008454 Hyperhidrosis Diseases 0.000 description 1
- 230000003872 anastomosis Effects 0.000 description 1
- 230000008321 arterial blood flow Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001361 intraarterial administration Methods 0.000 description 1
- 238000001990 intravenous administration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 208000013460 sweaty Diseases 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/06—Measuring blood flow
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/42—Details of probe positioning or probe attachment to the patient
- A61B8/4209—Details of probe positioning or probe attachment to the patient by using holders, e.g. positioning frames
- A61B8/4227—Details of probe positioning or probe attachment to the patient by using holders, e.g. positioning frames characterised by straps, belts, cuffs or braces
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/5215—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of medical diagnostic data
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Abstract
The invention discloses a wearable arteriovenous internal fistula blood flow monitoring device and system, which are characterized by comprising: the device comprises a main body shell, a fixing bandage, a contact cushion layer, a display screen, a control button, a buzzer alarm, an ultrasonic signal source, an ultrasonic transmitter, an ultrasonic receiver, a pulse signal receiver, a microprocessor chip, a digital-to-analog converter, a patch piezoelectric film sensor, a noise reducer, an amplifier and a band-pass filter; the device realizes the portable monitoring of the blood flow speed after the operation of the arteriovenous internal fistula, the real-time monitoring of the blood flow speed, the real-time mastering of the blood flow condition at the arteriovenous internal fistula can be realized, and when the risk of thrombus blockage occurs at the arteriovenous internal fistula, the thrombus can be found at the first time and thrombus clearing measures can be taken; and accurately collecting turbulence at the internal arteriovenous fistula to form a waveform, and judging whether the internal arteriovenous fistula is smooth or not through the waveform.
Description
Technical Field
The invention belongs to the field of wearable blood flow monitoring, and particularly relates to a wearable arteriovenous internal fistula blood flow monitoring device and system.
Background
Arteriovenous internal fistula is one of surgical operations and is mainly used for hemodialysis treatment; the arteriovenous internal fistula is a small operation for blood vessel anastomosis, wherein an artery close to a wrist part and an adjacent vein are sutured, so that arterial blood flows in the anastomosed vein to form an arteriovenous internal fistula; the arteriovenous internal fistula can provide sufficient blood for hemodialysis treatment and guarantee the sufficiency of the hemodialysis treatment;
some patients are easy to block within 7 days after arteriovenous internal fistula operation due to too thin blood vessels or thrombus formation, so that the arteriovenous internal fistula is blocked and cannot realize the function; therefore, the blood flow speed at the arteriovenous internal fistula of the patient needs to be monitored, if the blood flow is too slow, the arteriovenous internal fistula has a blockage risk, and measures need to be taken to eliminate thrombus so that the arteriovenous internal fistula is smooth; the normal intra-arterial blood flow is fast, the intra-venous blood flow is slow, the blood flow at the internal arteriovenous fistula is directly flushed into the vein by arterial blood to form turbulent flow, and whether the blood flow at the internal arteriovenous fistula is smooth or not can be further confirmed through the turbulent flow; however, the blood flow velocity monitoring can only be carried out in hospitals by reserving Doppler color ultrasonography at present, and in addition, turbulence at the internal arteriovenous fistula can only be judged simply by listening to vibration sound or touching vibration, and a large error exists; the real-time monitoring of the arteriovenous internal fistula after the operation of the patient can not be realized under the restriction of the conditions.
Disclosure of Invention
In order to solve the technical problems, the wearable arteriovenous internal fistula blood flow monitoring device and system are designed, the wearable arteriovenous internal fistula blood flow monitoring device is wearable, the purpose of carrying about blood flow speed monitoring after an arteriovenous internal fistula operation is achieved, the blood flow speed can be monitored in real time, the blood flow condition at the arteriovenous internal fistula can be mastered in real time, and when thrombus blockage risks occur at the arteriovenous internal fistula, thrombus clearing measures can be taken at the first time; accurately collecting turbulence at the internal arteriovenous fistula to form a waveform, and judging whether the internal arteriovenous fistula is smooth or not through the waveform;
in order to achieve the technical effects, the invention is realized by the following technical scheme: the utility model provides a wear-type arteriovenous internal fistula blood flow monitoring devices, system which characterized in that includes: the device comprises a main body shell, a fixing bandage, a contact cushion layer, a display screen, a control button, a buzzer alarm, an ultrasonic signal source, an ultrasonic transmitter, an ultrasonic receiver, a pulse signal receiver, a microprocessor chip, a digital-to-analog converter, a patch piezoelectric film sensor, a noise reducer, an amplifier and a band-pass filter;
two ends of the main body shell are respectively connected with a fixing bandage; the bottom surface of the main body shell is an arc surface, and a contact cushion layer which is also the arc surface is connected on the arc surface; the upper surface of the main body shell is connected with a display screen and a control key; one side surface of the main body shell is connected with a buzzer alarm; an ultrasonic signal source, an ultrasonic transmitter, an ultrasonic receiver and a pulse signal receiver are arranged in the main body shell; the bottom surface of the contact cushion layer is connected with a patch piezoelectric film sensor; an integrated circuit board is arranged in the main body shell, and a microprocessor chip, a digital-to-analog converter, a noise reducer, an amplifier and a band-pass filter are connected on the integrated circuit board;
furthermore, one of the fixing straps is connected with a connecting buckle, and the inside of the other fixing strap is connected with a magnetic attraction material; the two fixing straps are connected through magnetic attraction;
further, a USB charging port is connected to the main body shell;
further, the ultrasonic signal source is connected with an ultrasonic transmitter; the ultrasonic receiver is connected with the pulse signal receiver; the pulse signal receiver is connected with the microprocessor chip, the microprocessor chip is connected with the digital-to-analog converter, and the digital-to-analog converter is connected with the display screen;
furthermore, the patch piezoelectric film sensor is connected with a noise reducer, the noise reducer is connected with an amplifier, the amplifier is connected with a microprocessor chip, the microprocessor chip is connected with a digital-to-analog converter, the digital-to-analog converter is connected with a band-pass filter, and the band-pass filter is connected with a display screen.
Another objective of the present invention is to provide a working principle of a wearable arteriovenous internal fistula blood flow monitoring system:
the blood flow velocity monitoring principle is that ultrasonic waves are projected from the outside of the skin to the blood flow, the ultrasonic waves are scattered at the interface of blood plasma and blood cells with different impedances to generate frequency shift which is in direct proportion to the movement velocity of the blood cells, and the blood flow velocity can be obtained through system operation after the frequency shift is collected;
an ultrasonic signal is sent by an ultrasonic signal source, then the ultrasonic signal is received by an ultrasonic transmitter and then is transmitted, the ultrasonic wave passes through the skin, muscle tissues reach blood flow in a blood vessel, the ultrasonic wave is scattered and reflected on the surfaces of flowing blood plasma and blood cells and is received by an ultrasonic receiver, the ultrasonic wave can generate frequency deviation in direct proportion to the movement of the blood plasma or the blood cells at the moment, a pulse signal receiver can acquire the frequency deviation signal of the reflected ultrasonic wave and send the frequency deviation signal to a microprocessor chip, a preset algorithm program in the microprocessor chip processes the frequency deviation signal to finally obtain a blood flow speed signal, then the simulated blood flow speed signal is converted into a digital signal by a digital-to-analog converter and then is displayed on a display screen of the device, and a user can observe the blood flow speed information at the arteriovenous fistula in real time through the display; the program in the microprocessor chip stores and writes the range of normal value of blood flow speed, when the blood flow speed monitored in real time exceeds the range, the microprocessor chip can control the buzzer alarm to alarm and remind;
blood flow at an arteriovenous internal fistula is directly flushed into a vein by arterial blood to form turbulent flow, the turbulent flow can generate weak vibration signals through muscle skin, the vibration signals are difficult to be intuitively captured by medical personnel, but can be accurately captured by a patch piezoelectric film sensor, after the patch piezoelectric film sensor is attached to the skin and is subjected to weak vibration, two film electrodes can generate potential difference, and the potential difference is turbulent flow vibration information required to be acquired; the patch piezoelectric film sensor collects turbulence vibration information and then sends the turbulence vibration information to the noise reducer, the noise reducer performs noise filtration on the collected signals, and then the signals are subjected to gain amplification through the amplifier, so that effective signals are reserved, and distortion caused by signal attenuation in the later period is prevented; the turbulence vibration signal after noise reduction and amplification is processed by the microprocessor chip, the processed turbulence vibration signal is sent to the digital-to-analog converter to convert the analog signal into a digital signal, the digital signal is sent to the band-pass filter, the lower frequency and the higher frequency of the turbulence vibration signal are filtered out by the band-pass filter, the waveform of the turbulence vibration signal is imaged by the display screen, and the turbulence condition at the arteriovenous internal fistula can be visually judged through the waveform, so that whether the arteriovenous internal fistula is smooth or not is judged.
Another object of the present invention is to provide a method for using a wearable arteriovenous internal fistula blood flow monitoring device, comprising:
1. placing a contact pad layer of the device at an arteriovenous internal fistula, and fixing the device on an arm by using a fixing bandage;
2. after the power supply of the device is turned on, operating a blood flow monitoring control button to start to monitor the blood flow at the arteriovenous internal fistula in real time, and viewing the monitoring result through a display screen on the device;
3. the arteriovenous internal fistula turbulence monitoring control key is operated to start to monitor the arteriovenous internal fistula turbulence vibration signal, the monitoring data is presented on the display screen in a waveform mode, and the arteriovenous internal fistula turbulence condition can be known through the waveform of the display screen, so that the smooth condition is judged.
The invention has the beneficial effects that:
1. the device is designed into a wearable structure, a user can wear the monitoring device to monitor the blood flow speed at the arteriovenous internal fistula and the turbulent flow condition generated by arterial blood and venous blood in real time, the smooth condition at the arteriovenous internal fistula can be judged in real time according to the turbulent flow condition generated by the blood flow speed and the arterial blood and venous blood, and measures can be taken immediately when the thrombus risk or blockage condition is found to occur, so that the smooth blood flow at the arteriovenous internal fistula is ensured;
2. the device can monitor the blood flow speed and the turbulent flow condition generated by arterial blood and venous blood at the arteriovenous internal fistula in real time, and can visually reflect the monitoring result on a display screen, so that a user or medical personnel can visually judge the unblocked condition of the blood flow according to the monitoring data;
3. the device is designed with an alarm function, when the blood flow speed is too low and the blockage symptom occurs, medical personnel can be reminded to take thrombus clearing measures to the internal arteriovenous fistula of the patient through alarming, and the smoothness is ensured.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic overall structure diagram of a wearable arteriovenous internal fistula blood flow monitoring device and system;
FIG. 2 is a schematic view of a main body housing and its internal structure of a wearable arteriovenous internal fistula blood flow monitoring device and system;
FIG. 3 is a schematic view of the structure of the lower bottom surface of the main body shell of a wearable arteriovenous internal fistula blood flow monitoring device and system;
FIG. 4 is a schematic block diagram of a blood flow velocity monitoring system of a wearable arteriovenous internal fistula blood flow monitoring device and system;
FIG. 5 is a schematic block diagram of a turbulence monitoring system of a wearable arteriovenous internal fistula blood flow monitoring device, system;
in the drawings, the components represented by the respective reference numerals are listed below:
the device comprises a main body shell, 101-a USB charging port, 2-a fixing bandage, 201-a connecting buckle, 3-a contact soft cushion, 4-a display screen, 5-a control button, 6-a buzzer alarm, 7-an ultrasonic signal source, 8-an ultrasonic transmitter, 9-an ultrasonic receiver, 10-a pulse signal receiver, 11-a microprocessor chip, 12-a digital-to-analog converter, 13-a patch piezoelectric film sensor, 14-a noise reducer, 15-an amplifier and 16-a band-pass filter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Example 1
Referring to fig. 1 to 5, a wearable arteriovenous internal fistula blood flow monitoring device and system is characterized by comprising: the device comprises a main body shell 1, a fixing binding belt 2, a contact cushion layer 3, a display screen 4, a control key 5, a buzzer alarm 6, an ultrasonic signal source 7, an ultrasonic transmitter 8, an ultrasonic receiver 9, a pulse signal receiver 10, a microprocessor chip 11, a digital-to-analog converter 12, a patch piezoelectric film sensor 13, a noise reducer 14, an amplifier 15 and a band-pass filter 16;
two ends of the main body shell 1 are respectively connected with a fixing bandage 2; the bottom surface of the main body shell 1 is an arc surface, and a contact cushion layer 3 which is also the arc surface is connected on the arc surface; the upper surface of the main body shell 1 is connected with a display screen 4 and a control key 5; one side surface of the main body shell 1 is connected with a buzzer alarm 6; an ultrasonic signal source 7, an ultrasonic transmitter 8, an ultrasonic receiver 9 and a pulse signal receiver 10 are arranged in the main body shell 1; the bottom surface of the contact cushion layer 3 is connected with a patch piezoelectric film sensor 13; an integrated circuit board is arranged in the main body shell 1, and a microprocessor chip 11, a digital-to-analog converter 12, a noise reducer 14, an amplifier 15 and a band-pass filter 16 are connected on the integrated circuit board;
one of the fixing straps 2 is connected with a connecting buckle 201, and the inside of the other fixing strap 2 is connected with a magnetic attraction material; the two fixing straps 2 are connected through magnetic attraction;
a USB charging port 101 is connected to the main body shell 1; the storage battery of the device is charged through the USB charging port 101, and the storage battery provides electric energy for the work of the whole device;
the ultrasonic signal source 7 is connected with an ultrasonic transmitter 8; the ultrasonic receiver 9 is connected with the pulse signal receiver 10; the pulse signal receiver 10 is connected with the microprocessor chip 11, the microprocessor chip 11 is connected with the digital-to-analog converter 12, and the digital-to-analog converter 12 is connected with the display screen 4; an ultrasonic signal is sent by an ultrasonic signal source 7 and then is received by an ultrasonic emitter 8 for emission, the ultrasonic wave reaches blood flow in a blood vessel through skin and muscle tissue, the ultrasonic wave is scattered on the surface of flowing blood plasma and blood cells and then is reflected, and is received by the ultrasonic receiver 9, and the ultrasonic wave generates a frequency shift proportional to the movement of blood plasma or blood cells, the pulse signal receiver 10 collects the frequency shift signal of the reflected ultrasonic wave, the frequency deviation signal is processed by a preset algorithm program in the microprocessor chip 11 to finally obtain a blood flow velocity signal, the analog blood flow velocity signal is converted into a digital signal by a digital-to-analog converter 12 and then displayed on a display screen 4 of the device, and a user can observe the blood flow velocity information at the internal arteriovenous fistula in real time through the display screen 4; the program in the microprocessor chip 11 is stored and written into the normal value range of the blood flow speed, and when the blood flow speed monitored in real time exceeds the range, the microprocessor chip 11 controls the buzzer alarm 6 to alarm and remind;
the patch piezoelectric film sensor 13 is connected with the noise reducer 14, the noise reducer 14 is connected with the amplifier 15, the amplifier 15 is connected with the microprocessor chip 11, the microprocessor chip 11 is connected with the digital-to-analog converter 12, the digital-to-analog converter 12 is connected with the band-pass filter 16, and the band-pass filter 16 is connected with the display screen 4; blood flow at an arteriovenous internal fistula is directly flushed into a vein by arterial blood to form turbulent flow, the turbulent flow can generate weak vibration signals through muscle skin, the vibration signals are difficult to be intuitively captured by medical personnel, but can be accurately captured by a patch piezoelectric film sensor 13, after the patch piezoelectric film sensor 13 is attached to the skin and is subjected to weak vibration, two film electrodes can generate potential difference, and the potential difference is turbulent flow vibration information required to be acquired; the patch piezoelectric film sensor 13 collects turbulence vibration information and then sends the turbulence vibration information to the noise reducer 14, the noise reducer 14 carries out noise filtration processing on collected signals, then the signals are subjected to gain amplification through the amplifier 15, effective signals are reserved, and distortion caused by signal attenuation in the later period is prevented; the turbulence vibration signal after noise reduction and amplification is processed by the microprocessor chip 11, the processed turbulence vibration signal is sent to the digital-to-analog converter 12 to be converted into a digital signal after the processing of the microprocessor chip 11, the digital signal is sent to the band-pass filter 16, the lower frequency and the higher frequency of the turbulence vibration signal are filtered out by the band-pass filter 16, the waveform of the turbulence vibration signal is imaged by the display screen 4, the turbulence condition at the arteriovenous internal fistula can be visually judged through the waveform, and whether the arteriovenous internal fistula is smooth or not is sequentially judged.
Example 2
Referring to fig. 1 to 5, a wearable arteriovenous internal fistula blood flow monitoring device and system is characterized by comprising: the device comprises a main body shell 1, a fixing binding belt 2, a contact cushion layer 3, a display screen 4, a control key 5, a buzzer alarm 6, an ultrasonic signal source 7, an ultrasonic transmitter 8, an ultrasonic receiver 9, a pulse signal receiver 10, a microprocessor chip 11, a digital-to-analog converter 12, a patch piezoelectric film sensor 13, a noise reducer 14, an amplifier 15 and a band-pass filter 16;
two ends of the main body shell 1 are respectively connected with a fixing bandage 2; the bottom surface of the main body shell 1 is an arc surface, and a contact cushion layer 3 which is also the arc surface is connected on the arc surface; the upper surface of the main body shell 1 is connected with a display screen 4 and a control key 5; one side surface of the main body shell 1 is connected with a buzzer alarm 6; an ultrasonic signal source 7, an ultrasonic transmitter 8, an ultrasonic receiver 9 and a pulse signal receiver 10 are arranged in the main body shell 1; the bottom surface of the contact cushion layer 3 is connected with a patch piezoelectric film sensor 13; an integrated circuit board is arranged in the main body shell 1, and a microprocessor chip 11, a digital-to-analog converter 12, a noise reducer 14, an amplifier 15 and a band-pass filter 16 are connected on the integrated circuit board;
one of the fixing straps 2 is connected with a connecting buckle 201, and the inside of the other fixing strap 2 is connected with a magnetic attraction material; the two fixing straps 2 are connected through magnetic attraction; the fixing bandage 2 is made of waterproof materials, and a plurality of air holes are formed in the surface of the fixing bandage, so that the fixing bandage can play a role in ventilation after being wound and fixed on the arm, and the phenomenon that the wound part of the fixing bandage 2 is sweaty is avoided;
a USB charging port 101 is connected to the main body shell 1; the storage battery of the device is charged through the USB charging port 101, and the storage battery provides electric energy for the work of the whole device;
the ultrasonic signal source 7 is connected with an ultrasonic transmitter 8; the ultrasonic receiver 9 is connected with the pulse signal receiver 10; the pulse signal receiver 10 is connected with the microprocessor chip 11, the microprocessor chip 11 is connected with the digital-to-analog converter 12, and the digital-to-analog converter 12 is connected with the display screen 4; an ultrasonic signal is sent by an ultrasonic signal source 7 and then is received by an ultrasonic emitter 8 for emission, the ultrasonic wave reaches blood flow in a blood vessel through skin and muscle tissue, the ultrasonic wave is scattered on the surface of flowing blood plasma and blood cells and then is reflected, and is received by the ultrasonic receiver 9, and the ultrasonic wave generates a frequency shift proportional to the movement of blood plasma or blood cells, the pulse signal receiver 10 collects the frequency shift signal of the reflected ultrasonic wave, the frequency deviation signal is processed by a preset algorithm program in the microprocessor chip 11 to finally obtain a blood flow velocity signal, the analog blood flow velocity signal is converted into a digital signal by a digital-to-analog converter 12 and then displayed on a display screen 4 of the device, and a user can observe the blood flow velocity information at the internal arteriovenous fistula in real time through the display screen 4; the program in the microprocessor chip 11 is stored and written into the normal value range of the blood flow speed, and when the blood flow speed monitored in real time exceeds the range, the microprocessor chip 11 controls the buzzer alarm 6 to alarm and remind;
the patch piezoelectric film sensor 13 is connected with the noise reducer 14, the noise reducer 14 is connected with the amplifier 15, the amplifier 15 is connected with the microprocessor chip 11, the microprocessor chip 11 is connected with the digital-to-analog converter 12, the digital-to-analog converter 12 is connected with the band-pass filter 16, and the band-pass filter 16 is connected with the display screen 4; blood flow at an arteriovenous internal fistula is directly flushed into a vein by arterial blood to form turbulent flow, the turbulent flow can generate weak vibration signals through muscle skin, the vibration signals are difficult to be intuitively captured by medical personnel, but can be accurately captured by a patch piezoelectric film sensor 13, after the patch piezoelectric film sensor 13 is attached to the skin and is subjected to weak vibration, two film electrodes can generate potential difference, and the potential difference is turbulent flow vibration information required to be acquired; the patch piezoelectric film sensor 13 collects turbulence vibration information and then sends the turbulence vibration information to the noise reducer 14, the noise reducer 14 carries out noise filtration processing on collected signals, then the signals are subjected to gain amplification through the amplifier 15, effective signals are reserved, and distortion caused by signal attenuation in the later period is prevented; the turbulence vibration signal after noise reduction and amplification is processed by the microprocessor chip 11, the processed turbulence vibration signal is sent to the digital-to-analog converter 12 to be converted into a digital signal after the processing of the microprocessor chip 11, the digital signal is sent to the band-pass filter 16, the lower frequency and the higher frequency of the turbulence vibration signal are filtered out by the band-pass filter 16, the waveform of the turbulence vibration signal is imaged by the display screen 4, the turbulence condition at the arteriovenous internal fistula can be visually judged through the waveform, and whether the arteriovenous internal fistula is smooth or not is sequentially judged.
Example 3
Referring to fig. 1 to 5, a wearable arteriovenous internal fistula blood flow monitoring device and system is characterized by comprising: the device comprises a main body shell 1, a fixing binding belt 2, a contact cushion layer 3, a display screen 4, a control key 5, a buzzer alarm 6, an ultrasonic signal source 7, an ultrasonic transmitter 8, an ultrasonic receiver 9, a pulse signal receiver 10, a microprocessor chip 11, a digital-to-analog converter 12, a patch piezoelectric film sensor 13, a noise reducer 14, an amplifier 15 and a band-pass filter 16;
two ends of the main body shell 1 are respectively connected with a fixing bandage 2; the bottom surface of the main body shell 1 is an arc surface, and a contact cushion layer 3 which is also the arc surface is connected on the arc surface; the upper surface of the main body shell 1 is connected with a display screen 4 and a control key 5; one side surface of the main body shell 1 is connected with a buzzer alarm 6; an ultrasonic signal source 7, an ultrasonic transmitter 8, an ultrasonic receiver 9 and a pulse signal receiver 10 are arranged in the main body shell 1; the bottom surface of the contact cushion layer 3 is connected with a patch piezoelectric film sensor 13; an integrated circuit board is arranged in the main body shell 1, and a microprocessor chip 11, a digital-to-analog converter 12, a noise reducer 14, an amplifier 15 and a band-pass filter 16 are connected on the integrated circuit board;
soft fillers are filled in the contact cushion layer 3, so that the comfortable feeling in use can be ensured;
one of the fixing straps 2 is connected with a connecting buckle 201, and the inside of the other fixing strap 2 is connected with a magnetic attraction material; the two fixing straps 2 are connected through magnetic attraction;
a USB charging port 101 is connected to the main body shell 1; the storage battery of the device is charged through the USB charging port 101, and the storage battery provides electric energy for the work of the whole device;
the ultrasonic signal source 7 is connected with an ultrasonic transmitter 8; the ultrasonic receiver 9 is connected with the pulse signal receiver 10; the pulse signal receiver 10 is connected with the microprocessor chip 11, the microprocessor chip 11 is connected with the digital-to-analog converter 12, and the digital-to-analog converter 12 is connected with the display screen 4; an ultrasonic signal is sent by an ultrasonic signal source 7 and then is received by an ultrasonic emitter 8 for emission, the ultrasonic wave reaches blood flow in a blood vessel through skin and muscle tissue, the ultrasonic wave is scattered on the surface of flowing blood plasma and blood cells and then is reflected, and is received by the ultrasonic receiver 9, and the ultrasonic wave generates a frequency shift proportional to the movement of blood plasma or blood cells, the pulse signal receiver 10 collects the frequency shift signal of the reflected ultrasonic wave, the frequency deviation signal is processed by a preset algorithm program in the microprocessor chip 11 to finally obtain a blood flow velocity signal, the analog blood flow velocity signal is converted into a digital signal by a digital-to-analog converter 12 and then displayed on a display screen 4 of the device, and a user can observe the blood flow velocity information at the internal arteriovenous fistula in real time through the display screen 4; the program in the microprocessor chip 11 is stored and written into the normal value range of the blood flow speed, and when the blood flow speed monitored in real time exceeds the range, the microprocessor chip 11 controls the buzzer alarm 6 to alarm and remind;
the patch piezoelectric film sensor 13 is connected with the noise reducer 14, the noise reducer 14 is connected with the amplifier 15, the amplifier 15 is connected with the microprocessor chip 11, the microprocessor chip 11 is connected with the digital-to-analog converter 12, the digital-to-analog converter 12 is connected with the band-pass filter 16, and the band-pass filter 16 is connected with the display screen 4; blood flow at an arteriovenous internal fistula is directly flushed into a vein by arterial blood to form turbulent flow, the turbulent flow can generate weak vibration signals through muscle skin, the vibration signals are difficult to be intuitively captured by medical personnel, but can be accurately captured by a patch piezoelectric film sensor 13, after the patch piezoelectric film sensor 13 is attached to the skin and is subjected to weak vibration, two film electrodes can generate potential difference, and the potential difference is turbulent flow vibration information required to be acquired; the patch piezoelectric film sensor 13 collects turbulence vibration information and then sends the turbulence vibration information to the noise reducer 14, the noise reducer 14 carries out noise filtration processing on collected signals, then the signals are subjected to gain amplification through the amplifier 15, effective signals are reserved, and distortion caused by signal attenuation in the later period is prevented; the turbulence vibration signal after noise reduction and amplification is processed by the microprocessor chip 11, the processed turbulence vibration signal is sent to the digital-to-analog converter 12 to be converted into a digital signal after the processing of the microprocessor chip 11, the digital signal is sent to the band-pass filter 16, the lower frequency and the higher frequency of the turbulence vibration signal are filtered out by the band-pass filter 16, the waveform of the turbulence vibration signal is imaged by the display screen 4, the turbulence condition at the arteriovenous internal fistula can be visually judged through the waveform, and whether the arteriovenous internal fistula is smooth or not is sequentially judged.
In summary, 1, the device is designed to be a wearable structure, a user can wear the monitoring device to monitor the blood flow speed at the arteriovenous internal fistula and the turbulent flow condition generated by arterial blood and venous blood in real time, the smooth condition at the arteriovenous internal fistula can be judged in real time according to the blood flow speed and the turbulent flow condition generated by the arterial blood and the venous blood, and measures can be taken immediately when a thrombus risk or blockage condition is found to occur, so that the smooth blood flow at the arteriovenous internal fistula is ensured;
2. the device can monitor the blood flow speed and the turbulent flow condition generated by arterial blood and venous blood at the arteriovenous internal fistula in real time, and can visually reflect the monitoring result on a display screen, so that a user or medical personnel can visually judge the unblocked condition of the blood flow according to the monitoring data;
3. the device is designed with an alarm function, when the blood flow speed is too low and the blockage symptom occurs, medical personnel can be reminded to take thrombus clearing measures to the internal arteriovenous fistula of the patient through alarming, and the smoothness is ensured.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The utility model provides a wear-type arteriovenous internal fistula blood flow monitoring device which characterized in that includes: the device comprises a main body shell, a fixing bandage, a contact cushion layer, a display screen, a control button, a buzzer alarm, an ultrasonic signal source, an ultrasonic transmitter, an ultrasonic receiver, a pulse signal receiver, a microprocessor chip, a digital-to-analog converter, a patch piezoelectric film sensor, a noise reducer, an amplifier and a band-pass filter;
two ends of the main body shell are respectively connected with a fixing bandage; the bottom surface of the main body shell is an arc surface, and a contact cushion layer which is also the arc surface is connected on the arc surface; the upper surface of the main body shell is connected with a display screen and a control key; one side surface of the main body shell is connected with a buzzer alarm; an ultrasonic signal source, an ultrasonic transmitter, an ultrasonic receiver and a pulse signal receiver are arranged in the main body shell; the bottom surface of the contact cushion layer is connected with a patch piezoelectric film sensor; an integrated circuit board is arranged in the main body shell, and a microprocessor chip, a digital-to-analog converter, a noise reducer, an amplifier and a band-pass filter are connected on the integrated circuit board.
2. The wearable arteriovenous internal fistula blood flow monitoring device of claim 1, wherein one of the securing straps is connected with a connector link, and the other securing strap is internally connected with a magnetic attraction material; the two fixing straps are connected through magnetic attraction.
3. The wearable arteriovenous internal fistula blood flow monitoring device of claim 1 wherein a USB charging port is connected to the main body housing.
4. The wearable arteriovenous internal fistula blood flow monitoring device of claim 1 wherein the ultrasonic signal source is connected to an ultrasonic transmitter; the ultrasonic receiver is connected with the pulse signal receiver; the pulse signal receiver is connected with the microprocessor chip, the microprocessor chip is connected with the digital-to-analog converter, and the digital-to-analog converter is connected with the display screen.
5. The wearable arteriovenous internal fistula blood flow monitoring device of claim 1, wherein the patch piezoelectric film sensor is connected with a noise reducer, the noise reducer is connected with an amplifier, the amplifier is connected with a microprocessor chip, the microprocessor chip is connected with a digital-to-analog converter, the digital-to-analog converter is connected with a band-pass filter, and the band-pass filter is connected with a display screen.
6. The monitoring system of a wearable arteriovenous fistula blood flow monitoring device of any one of claims 1 to 5 wherein:
the blood flow velocity monitoring principle is that ultrasonic waves are projected from the outside of the skin to the blood flow, the ultrasonic waves are scattered at the interface of blood plasma and blood cells with different impedances to generate frequency shift which is in direct proportion to the movement velocity of the blood cells, and the blood flow velocity can be obtained through system operation after the frequency shift is collected;
an ultrasonic signal is sent by an ultrasonic signal source, then the ultrasonic signal is received by an ultrasonic transmitter and then is transmitted, the ultrasonic wave passes through the skin, muscle tissues reach blood flow in a blood vessel, the ultrasonic wave is scattered and reflected on the surfaces of flowing blood plasma and blood cells and is received by an ultrasonic receiver, the ultrasonic wave can generate frequency deviation in direct proportion to the movement of the blood plasma or the blood cells at the moment, a pulse signal receiver can acquire the frequency deviation signal of the reflected ultrasonic wave and send the frequency deviation signal to a microprocessor chip, a preset algorithm program in the microprocessor chip processes the frequency deviation signal to finally obtain a blood flow speed signal, then the simulated blood flow speed signal is converted into a digital signal by a digital-to-analog converter and then is displayed on a display screen of the device, and a user can observe the blood flow speed information at the arteriovenous fistula in real time through the display; the program in the microprocessor chip stores and writes the range of normal value of blood flow speed, when the blood flow speed monitored in real time exceeds the range, the microprocessor chip can control the buzzer alarm to alarm and remind;
blood flow at an arteriovenous internal fistula is directly flushed into a vein by arterial blood to form turbulent flow, the turbulent flow can generate weak vibration signals through muscle skin, the vibration signals are difficult to be intuitively captured by medical personnel, but can be accurately captured by a patch piezoelectric film sensor, after the patch piezoelectric film sensor is attached to the skin and is subjected to weak vibration, two film electrodes can generate potential difference, and the potential difference is turbulent flow vibration information required to be acquired; the patch piezoelectric film sensor collects turbulence vibration information and then sends the turbulence vibration information to the noise reducer, the noise reducer performs noise filtration on the collected signals, and then the signals are subjected to gain amplification through the amplifier, so that effective signals are reserved, and distortion caused by signal attenuation in the later period is prevented; the turbulence vibration signal after noise reduction and amplification is processed by the microprocessor chip, the processed turbulence vibration signal is sent to the digital-to-analog converter to convert the analog signal into a digital signal, the digital signal is sent to the band-pass filter, the lower frequency and the higher frequency of the turbulence vibration signal are filtered out by the band-pass filter, the waveform of the turbulence vibration signal is imaged by the display screen, and the turbulence condition at the arteriovenous internal fistula can be visually judged through the waveform, so that whether the arteriovenous internal fistula is smooth or not is judged.
7. The method of using a wearable arteriovenous fistula blood flow monitoring device of any one of claims 1-5 wherein:
(1) placing a contact pad layer of the device at an arteriovenous internal fistula, and fixing the device on an arm by using a fixing bandage;
(2) after the power supply of the device is turned on, operating a blood flow monitoring control button to start to monitor the blood flow at the arteriovenous internal fistula in real time, and viewing the monitoring result through a display screen on the device;
(3) the arteriovenous internal fistula turbulence monitoring control key is operated to start to monitor the arteriovenous internal fistula turbulence vibration signal, the monitoring data is presented on the display screen in a waveform mode, and the arteriovenous internal fistula turbulence condition can be known through the waveform of the display screen, so that the smooth condition is judged.
8. The wearable arteriovenous internal fistula blood flow monitoring device of any one of claims 1-5 which discloses the use of a wearable arteriovenous internal fistula blood flow monitoring device in the field of wearable blood flow monitoring.
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| CN113243903A (en) * | 2021-04-16 | 2021-08-13 | 顺德职业技术学院 | Device and system are protected to ease heart of arteriovenous fistula |
| CN113289108A (en) * | 2021-04-16 | 2021-08-24 | 顺德职业技术学院 | Arteriovenous fistula cardio-illumination protective belt and method for detecting hemodialysis |
| CN114190982A (en) * | 2021-11-03 | 2022-03-18 | 江苏大学 | Ultrasonic flow device for cardiovascular medium flow detection |
| CN114504345A (en) * | 2022-02-24 | 2022-05-17 | 南充市中心医院 | Convenient wearing detection ring capable of monitoring internal fistula function of dialysis patient in daily life |
| WO2023078151A1 (en) * | 2021-11-02 | 2023-05-11 | 深圳市人民医院 | Bracelet-type anterior wall artery puncture postoperative binding device having blood flow monitoring functionality |
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