Monitoring system for detecting thrombosis

Abstract

A monitoring system for detecting deep venous thrombosis, relating to the technical field of medical instruments. The monitoring system comprises a signal acquisition module and an ultrasonic hardware system. The signal acquisition module performs ultrasonic transceiving between a plurality of ultrasonic probes and a detected object to acquire ultrasonic detection data of the detected object, converts the ultrasonic detection data to analog signals by means of 128 channels in the ultrasonic probe, and transmits the analog signals to the ultrasonic hardware system. The ultrasonic hardware system comprises a multiplexer module, an analog signal processing module, a beamforming module, and an upper computer module. The monitoring system facilitates medical staff in monitoring the deep venous thrombosis of a patient. By arranging the plurality of ultrasonic probes, the monitoring system can monitor veins at different positions of the patient, thereby avoiding tedious operations during detection, and enabling the real-time detection of thrombosis of multiple lower limb veins of the patient.

Description

A monitoring system for detecting thrombosis Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a monitoring system for detecting thrombosis. Background Art

[0002] Deep venous thrombosis (DVT) of the lower extremities is a common disease in patients undergoing acute and critical illnesses and orthopedic surgery. DVT often leads to life-threatening pulmonary embolism (PE). Even if patients survive a PE attack, they remain at risk for chronic thromboembolic pulmonary hypertension, which can lead to death within 2-3 years of the initial attack. Therefore, early diagnosis of DVT and timely implementation of appropriate clinical decisions can help reduce the incidence and mortality of thrombosis and improve prognosis. Currently, no effective monitoring and early warning methods for DVT have been studied domestically or internationally, making the establishment of a real-time, convenient, and accurate DVT monitoring method particularly important.

[0003] Ultrasound examination of patients' lower limb veins generally requires a conventional bedside ultrasound device and is performed by a professional ultrasound physician. The process is complicated and cannot achieve real-time dynamic monitoring.

[0004] In the prior art, Chinese patent CN103721348A discloses an ultrasonic monitoring treatment device and an ultrasonic monitoring device, which include: an ultrasonic medium containing unit for containing an ultrasonic wave conductive medium; an ultrasonic monitoring probe for emitting ultrasonic waves for imaging, whose emitting surface is located in the ultrasonic medium containing unit; an ultrasonic treatment head for emitting ultrasonic waves for treatment, whose emitting surface is located in the ultrasonic medium containing unit; a sound-absorbing material containing unit located in the ultrasonic medium containing unit, which includes a flexible sound-transmitting membrane for enclosing a liquid sound-absorbing material capable of absorbing ultrasonic waves; and a sound-absorbing material charging and discharging unit for charging or withdrawing liquid sound-absorbing material into or out of the sound-absorbing material containing unit.

[0005] Chinese patent CN215458154U, a portable ultrasonic detection device suitable for human beings or animals, discloses a portable ultrasonic detection device suitable for human beings or animals, which includes a host and a display, the host includes a shell rotatably connected to the display and a control panel mounted on the shell, the shell includes a first side surface, a second side surface arranged opposite to the first side surface, and a periphery connected between the first side surface and the second side surface, the control panel is arranged on the first side surface, wherein the host also includes a buffer protection component, the periphery includes at least two edge portions and a corner portion transitionally connected between two adjacent edges, and the buffer protection component includes a corner protection portion covering the corner portion. By arranging the buffer protection component on the shell of the host, when the host falls, the buffer protection component covering the outside of the host shell first contacts the ground, thereby effectively buffering the impact force of the host falling to the ground, thereby effectively reducing the phenomenon of damage to the host due to falling.

[0006] Prior art uses ultrasound and its various components to facilitate ultrasonic testing and enhance the device's resistance to damage. However, ultrasound equipment generally requires specialized ultrasound physicians to operate, resulting in a complex operation process and inability to achieve real-time dynamic monitoring. To address these issues, the present invention provides a monitoring system for detecting thrombosis. By attaching a patch-like transducer and a solid coupling gel to the corresponding skin surface of a patient's lower limb veins using adhesive tape, this system enables real-time dynamic monitoring of lower limb vein changes, resolving the complex operation process and inability to monitor lower limb venous thrombosis in real time. Summary of the Invention

[0007] A monitoring system for detecting thrombosis employs an ultrasound detection device placed within an ultrasound probe, which is then fabricated into a patch and applied to a patient's lower limb veins for monitoring. The hardware system processes the device, allowing the host computer to display the patient's lower limb vein conditions in real time. This simplifies the lower limb venous thrombosis detection process and enables real-time monitoring of multiple locations. This is the basis for the present invention.

[0008] First aspect

[0009] The present invention provides a monitoring system for detecting thrombosis, which comprises:

[0010] Signal acquisition module and ultrasound hardware system.

[0011] The signal acquisition module receives and transmits ultrasonic waves between multiple ultrasonic probes and the inspected part to obtain ultrasonic detection data of the inspected part, and converts the ultrasonic detection data into analog signals through the 128 channels in the ultrasonic probe and transmits them to the ultrasonic hardware system.

[0012] The ultrasound hardware system includes a multi-path selection module, an analog signal processing module, a beamforming module and a host computer module.

[0013] in

[0014] Multi-channel selection module: receives the 128-channel analog signals output by multiple ultrasonic probes transmitted by the signal acquisition module, selects one of the 128-channel analog signals output by the multiple ultrasonic probes, allows only the 128-channel analog signal of the selected probe to pass, and transmits the 128-channel analog signal to the analog signal processing module; the selection of multiple ultrasonic detection data is based on the observation requirements of the actual detection site;

[0015] Analog signal processing module: The selected 128-channel analog signals enter the analog signal processing module. Each analog signal undergoes low-noise amplification, noise reduction filtering, variable gain amplification, and analog-to-digital signal conversion before being converted into 128 digital 12-bit channel data and transmitted to the beamforming module.

[0016] Beamforming module: The digitized 128-channel 12-bit channel data is input into the beamforming module. According to the delay time calculated by the system, each channel data is delayed compensated so that the compensated digitized 128-channel 12-bit channel data are phase-aligned. Then, the 128-channel 12-bit channel data after delay compensation are synthesized into one channel of data by accumulation operation. The synthesized beam signal data is subjected to IQ demodulation and low-pass filtering to obtain baseband IQ data within a certain bandwidth range.

[0017] The synthesized beam signal data is subjected to IQ demodulation and low-pass filtering to obtain baseband IQ data within a certain bandwidth range.

[0018] Perform image preprocessing on the baseband IQ data, including envelope extraction, logarithmic compression, etc., to finally obtain image data that can be displayed.

[0019] The processed image data is transmitted to the host computer module.

[0020] Host computer module: displays the processed digital signal on the host computer in the form of image data.

[0021] Furthermore, the host computer may be a display.

[0022] Furthermore, the host computer module interactively controls the ultrasound hardware system, specifically controlling the multi-channel selection module to select the incoming analog signal;

[0023] Furthermore, the host computer module issues commands to the ultrasound hardware system, thereby controlling the signal acquisition module to acquire signals. The acquisition method is that the user controls and starts multiple probe scanning functions through the host computer module.

[0024] One implementation mode of the present invention is as follows: the host computer module sends a command to the ultrasound hardware system via WIFI, command 1, instructing the multiplexer to select only probe 1, scan for S seconds, rest for G seconds, and the image of probe 1 is uploaded to the host computer in real time, followed by command 2, instructing the multiplexer to select only probe 2, scan for S seconds, rest for G seconds, and the image of probe 2 is uploaded to the host computer in real time, and finally command 3, instructing the multiplexer to select only probe 3, scan for S seconds, rest for G seconds, and the image of probe 3 is uploaded to the host computer in real time, and then the host computer module controls the multiplexer to switch back to probe 1, and so on, until the time to start the three-probe scanning function exceeds T seconds, the software control system stops scanning, and the host computer module obtains the image data of the three probes respectively.

[0025] Second aspect

[0026] The present invention provides a monitoring device for detecting thrombosis, which comprises:

[0027] Detection components, detection host 1 and host computer 2,

[0028] in

[0029] A detection component, the detection component includes the signal acquisition module described in the first aspect, wherein the ultrasonic detection probe is a patch probe 3, one end of the probe 3 is connected to a data cable 4, and is connected to the detection host 1 through a plug;

[0030] The detection host 1 includes a control mainboard 1008, a heat sink 1006, a power converter 1007 and a housing 1003.

[0031] in

[0032] The control mainboard 1008, the heat sink 1006, the power converter 1007 and the housing 1003 are placed in the housing 1003.

[0033] The control mainboard 1008 is loaded with the ultrasonic hardware system described in the first aspect, analyzes and processes various data, controls other electrical appliances in the device, and is responsible for information transmission.

[0034] The housing 1003 is connected by snapping together to form a cavity inside the detection host.

[0035] A naked switch 1001 is provided on one side of the housing 1003, which is the power switch of the detection host 1.

[0036] An interface 1002 is provided on one side of the housing 1003 for connecting to an external detection device to achieve signal transmission.

[0037] The detection host is provided with a battery 1005 for supplying power to other electrical devices of the device.

[0038] The radiator 1006 is used to dissipate heat from the control mainboard 8 to prevent it from overheating.

[0039] The power converter 1007 converts electrical energy during charging so that the electrical energy is stored in the battery 1005 .

[0040] Host computer 2, which is connected to the detection host 1 by signal and is used for displaying relevant images and information;

[0041] A connecting plate 5 and a supporting plate 6 for supporting the connecting plate 5 are provided on the upper surface of the detection host 1 . One side of the connecting plate 5 is rotatably connected to the detection host 1 and is connected to the host computer 2 by magnetic attraction.

[0042] Compared with the existing technology, the monitoring system for detecting thrombosis provided by the present invention has the following technical advantages:

[0043] The present invention provides a monitoring system for detecting thrombosis, which uses a patch probe to perform ultrasonic detection on the patient's lower limb veins, making it convenient for medical staff to monitor the patient's lower limb venous thrombosis. By setting up multiple ultrasonic probes, it is possible to monitor the veins at different locations of the patient, avoiding tedious operations during detection, and performing real-time thrombosis detection on multiple veins of the patient.

[0044] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a block diagram of the overall structure of a monitoring system for detecting thrombosis according to the present invention.

[0046] FIG2 is a schematic diagram of the overall structure of a monitoring device for detecting thrombosis according to the present invention.

[0047] FIG3 is a schematic structural diagram of a monitoring device for detecting thrombosis according to the present invention with the host computer removed.

[0048] FIG4 is a schematic diagram of a monitor for detecting thrombosis according to the present invention with a connecting plate removed.

[0049] FIG5 is a schematic diagram of a folded support plate of a monitoring device for detecting thrombosis according to the present invention.

[0050] FIG6 is a schematic diagram of the internal structure of a monitoring device for detecting thrombosis according to the present invention.

[0051] FIG7 is a schematic diagram of the internal structure of a monitoring device for detecting thrombosis according to the present invention.

[0052] FIG8 is a schematic diagram of normal lower limb veins under two-dimensional conditions in Example 2 of the present invention.

[0053] FIG9 is a schematic diagram of thrombosis in lower limb veins under two-dimensional conditions in Example 2 of the present invention.

[0054] FIG10 is a schematic diagram of normal lower limb veins under color Doppler conditions in Example 2 of the present invention.

[0055] FIG11 is a schematic diagram of thrombosis in the lower limb veins under color Doppler conditions in Example 2 of the present invention.

[0056] FIG12 is a schematic diagram of lower limb veins under spectral Doppler conditions in Example 2 of the present invention.

[0057] FIG13 is a schematic diagram of beam synthesis of a monitor for detecting thrombosis in Example 1 of the present invention.

[0058] FIG14 is a schematic diagram of demodulation and filtering of a monitoring device for detecting thrombosis in Example 1 of the present invention.

[0059] The accompanying drawings are numbered as follows: 1-detection host; 2-host computer; 3-patch probe; 4-data cable; 5-connection board; 6-support board; 1001-power switch; 1002-interface; 1003-housing; 1004-protective shell; 1005-battery; 1006-radiator; 1007-power converter; 1008-mainboard. DETAILED DESCRIPTION

[0060] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0061] Example 1 A monitoring device for detecting thrombosis

[0062] As shown in Figures 1-7, 13, and 14

[0063] A monitoring device for detecting thrombosis, comprising:

[0064] Detection components, detection host 1 and host computer 2.

[0065] in

[0066] Detection components,

[0067] The detection component includes a signal acquisition module, which transmits and receives ultrasonic waves between multiple ultrasonic probes and the inspected part to obtain ultrasonic detection data of the inspected object, and converts the ultrasonic detection data into an analog signal through the 128 channels in the ultrasonic probe, and transmits it to the detection host 1; wherein the ultrasonic detection probe is a patch probe 3, one end of the probe 3 is connected to the data cable 4, and is connected to the detection host 1 through a plug.

[0068] Detect host 1,

[0069] The detection host 1 includes a control mainboard 1008 and an ultrasonic hardware system mounted on the control mainboard 1008, a radiator 1006, a power converter 1007 and a housing 1003.

[0070] in

[0071] The control mainboard 1008, the heat sink 1006, and the power converter 1007 are placed in the housing 1003, and the housing 1003 is connected by a snap-on method to form a cavity inside the detection host.

[0072] A naked switch 1001 is provided on one side of the housing 1003, which is the power switch of the detection host 1.

[0073] An interface 1002 is provided through a hole on one side of the housing 1003 for connecting to an external detection device to achieve signal transmission.

[0074] The detection host is internally provided with a battery 1005 for supplying power to other electrical devices of the device.

[0075] The radiator 1006 is used to dissipate heat from the control mainboard 8 to prevent it from being overheated.

[0076] The power converter 1007 converts electrical energy during charging so that the electrical energy is stored in the battery 1005 .

[0077] The ultrasound hardware system includes a multi-path selection module, an analog signal processing module, a beamforming module and a host computer module.

[0078] in

[0079] Multi-channel selection module: receives the 128-channel analog signals output by the three ultrasonic probes transmitted by the signal acquisition module, selects one of the 128-channel analog signals output by the three ultrasonic probes, and only allows the 128-channel analog signal of the selected probe to pass through, and transmits the 128-channel analog signal to the analog signal processing module; the selection of the three ultrasonic detection data is based on the observation requirements of the actual detection site;

[0080] Analog signal processing module: The selected 128-channel analog signals enter the analog signal processing module. Each analog signal undergoes low-noise amplification, noise reduction filtering, variable gain amplification, and analog-to-digital signal conversion before being converted into 128 digital 12-bit channel data and transmitted to the beamforming module.

[0081] The single-channel analog signal chain parameters are as follows:

[0082] 1. The low noise gain amplifier (LNA) of the receiving circuit supports adjustable gain of +12dB or +18dB.

[0083] 2. The variable gain amplifier (VGA) of the receiving circuit supports linear adjustable gain from 0dB to +30dB.

[0084] 3. The anti-aliasing filter (AAF) of the receiving circuit supports bandwidths of 9MHz, 10MHz, 15MHz, and 18MHz

[0085] The ADC resolution of the receiving circuit is 12 bits and the sampling rate is 50MHz;

[0086] Beamforming module: The digitized 128-channel 12-bit channel data is input into the beamforming module. According to the delay time calculated by the system, each channel data is delayed compensated so that the compensated digitized 128-channel 12-bit channel data are phase-aligned. Then, the 128-channel 12-bit channel data after delay compensation are synthesized into one channel of data by accumulation operation. The synthesized beam signal data is subjected to IQ demodulation and low-pass filtering to obtain baseband IQ data within a certain bandwidth range.

[0087] As shown in Figure 13

[0088] Assume that at time t, 128 receiving channels input data x1(t), x2(t)...x128(t). After delay accumulation calculation, each channel ch will calculate a corresponding path delay τ ch (t), each channel data uses its own τ ch (t) is delayed and then all are accumulated to form the beamformed data S(t).

[0089] The synthesized beam signal data is subjected to IQ demodulation and low-pass filtering to obtain baseband IQ data within a certain bandwidth range.

[0090] As shown in Figure 14

[0091] The beamformed signal S(t) is a modulated signal containing a carrier wave. To facilitate subsequent processing, it needs to be aligned for demodulation and low-pass filtering to convert it into a baseband signal with a center frequency of 0 and suppress useless signals outside the design bandwidth.

[0092] Demodulate the signal, that is, multiply S(t) by a complex demodulation factor,

[0093] ei*2*π*fc*t=Cos(2*π*fc*t)-j*sin(2**π*fc*t), where fc is the demodulation frequency. In this way, IQ demodulation data containing the baseband signal can be obtained. In actual operation, S(t) is copied into two signals and multiplied by cos(2*π*fc*t) and sin(2*π*fc*t) respectively. dem (t)=S(t)*cos(2*π*fc*t) Q dem (t) = S(t)*-sin(2*π*fc*t)

[0094] The demodulated IQ data contains unnecessary high-frequency components, so we need to pass the above IQ data through a low-pass filter (LPF) to obtain the IQ signal within the desired bandwidth. Assuming that the signal bandwidth we need is B, we set the cutoff frequency of the low-pass filter function H(t) to B / 2 to obtain the final IQ data.

[0095] I(t)=I dem (t)ΦH(t), Q(t)=Q dem (t)ΦH(t),

[0096] In the above formula, Φ represents the convolution operator symbol.

[0097] Perform image preprocessing on the baseband IQ data, including envelope extraction, logarithmic compression, etc., to finally obtain image data that can be displayed.

[0098] The IQ data obtained by demodulation and filtering carries the phase and amplitude information of the original beam data, and the B mode requires amplitude, so it is necessary to perform envelope operation on the IQ data to obtain the amplitude of the original beam data.

[0099] The amplitude range of the envelope data A(t) far exceeds the pixel range (0 to 255) that can be realized by the computer, so it needs to be logarithmically compressed so that it is within the range of 0 to 255. P(t) = A*log 10 (A(t))+B,

[0100] Where A and B are compression parameters, which are adjusted according to the actual debugging situation to obtain a good image display effect. Usually the initial value of A is 20, the initial value of B is 0, and P(t) is the final pixel value of the image to be displayed;

[0101] The processed image data is transmitted to the host computer 2.

[0102] The host computer 2, the display component 2 is connected to the detection host 1 by signal, and is used for displaying relevant images and information.

[0103] The host computer 2 interactively controls the ultrasonic hardware system, specifically controls the multi-way selection module to select the incoming analog signal; sends commands to the ultrasonic hardware system, and then controls the signal acquisition module to acquire signals. The acquisition method is that the user controls the start of the three probe scanning function through the host computer 2. The host computer 2 sends commands to the ultrasonic hardware system via WIFI. At the beginning, the multi-way selector only selects probe 1, scans for S seconds, rests for G seconds, and the image of probe 1 is uploaded to the host computer in real time. Then the software controls the multi-way selector only selects probe 2, scans for S seconds, rests for G seconds, and the image of probe 2 is uploaded to the host computer 2 in real time. Finally, the software controls the multi-way selector only selects probe 3, scans for S seconds, rests for G seconds, and the image of probe 3 is uploaded to the host computer 2 in real time. Then the host computer 2 controls the multi-way selector to switch back to probe 1, and so on. Until the time for starting the three-probe scanning function exceeds T seconds, the software control system stops scanning, and the host computer 2 obtains the image data of the three probes respectively.

[0104] A connecting plate 5 and a supporting plate 6 for supporting the connecting plate are provided on the upper surface of the detection host 1 . One side of the connecting plate 5 is rotatably connected to the detection host 1 and is connected to the host computer 2 by magnetic attraction.

[0105] Example 2: Use of a monitoring device for detecting thrombosis

[0106] The instrument used in this example is the same as that in Example 1.

[0107] Research subjects

[0108] The study subjects were patients who were bedridden for a long time (>72 hours) in the Emergency Intensive Care Unit of Shanghai Sixth People's Hospital. The purpose and methods of the study were explained to the patients, and their consent was obtained. The patients signed an informed consent form.

[0109] The monitor is operated by professional ward physicians or nurses who have received professional ultrasound training and can determine the presence of thrombosis early and in a timely manner.

[0110] Operation process

[0111] 1) Turn on the detection host 1 of the monitoring instrument and connect the detection host 1 to the host computer 2 via wireless.

[0112] 2) Place the patch probes of the monitor on the corresponding skin surfaces of the femoral vein, popliteal vein, and calf muscle vein of the subject's left lower limb, and use tape to stick the three patch probes to the corresponding positions. Adjust the ultrasound image of the host computer 2 so that its gain and depth are in the optimal image state.

[0113] 3) The detection host 1 of the monitor is tied to the waist of the subject, so that the subject can realize real-time dynamic monitoring of the ultrasound image of the lower limb veins no matter lying flat on the bed or walking, and predict the formation of thrombosis at an early stage.

[0114] 4) Professional ward physicians or nursing staff should detect precursors of thrombosis on lower extremity venous ultrasound images: 2D images: increased venous diameter, roughened venous wall, echogenicity within the lumen, inability to close under pressure, and an increase in venous diameter of <10% under fatigue maneuvers;

[0115] Color Doppler image: The blood flow in the venous lumen cannot be completely filled, and there is no color flow enhancement after the probe is pressurized;

[0116] Spectral Doppler image: The changes in blood flow velocity with respiration disappear, and the fatigue test response disappears.

[0117] When the above signs appear on ultrasound images, doctors and nurses should report to their superiors in a timely manner and provide appropriate drug treatment.

[0118] The incidence of left lower limb venous thrombosis is higher than that of right lower limb, which is 2 to 3 times that of the right side.

[0119] In a statistical experiment of 1,432 cases, the incidence of left lower limb venous thrombosis was 69.3%, right limb venous thrombosis was 26.6%, and bilateral venous thrombosis was 4.1%. Therefore, the probe was first placed on the left lower limb to monitor the occurrence of thrombosis.

[0120] The incidence of calf muscle vein thrombosis is higher than that of the femoral vein and popliteal vein in the thigh, but the mortality rate of femoral vein and popliteal vein thrombosis is higher than that of the calf muscle vein, and the ultrasound images of the femoral vein and popliteal vein are easier to show. Therefore, we chose to place three patch probes on the corresponding skin surface of the femoral vein, popliteal vein and calf muscle vein to monitor the occurrence of thrombosis.

[0121] Image Examples and Interpretation

[0122] In two-dimensional conditions:

[0123] Under normal circumstances: 1. The walls of the lower limb veins are relatively smooth and continuous, and the lumen is well permeable to sound; 2. The diameter of the veins can be closed by applying pressure with the probe; 3. The inner diameter of the veins increases by ≥10% under fatigue maneuvers.

[0124] In the case of lower extremity venous thrombosis: 1. The lower extremity venous wall is thickened and roughened, exceeding 2mm in thickness, with fine, suspended hypoechoic, low-echoic, or high-echoic features within the lumen; 2. The venous diameter cannot be closed with transducer pressure; 3. The venous internal diameter increases by less than 10% during fatigue maneuvers.

[0125] As shown in Figure 8, where: A: normal circumference common femoral vein cross section, B: normal femoral vein longitudinal section;

[0126] Under normal circumstances, the walls of the lower limb veins are relatively smooth and continuous, and the lumen is well permeable. The diameter of the vein can be compressed by the probe, and the inner diameter of the vein increases by ≥10% under fatigue maneuvers.

[0127] As shown in Figure 9, where: A: longitudinal section of common femoral vein thrombosis, B: transverse section of femoral vein thrombosis;

[0128] In the case of lower extremity vein thrombosis: the lower extremity vein wall is thickened, there is a real echo in the lumen, the vein diameter cannot be closed by probe pressure, and the vein diameter increases by <10% under fatigue maneuver

[0129] Under color Doppler conditions:

[0130] Under normal circumstances: 1. The blood flow in the venous lumen of the lower limbs is well filled; 2. Manual compression of the distal limbs will enhance the color filling of the venous blood flow.

[0131] In the case of thrombosis in the lower limb veins: 1. Partial embolism, there is a filling defect in the lumen of the lower limb veins, discontinuous blood flow filling, and only a narrow blood flow signal filling is seen; complete embolism, there is no blood flow filling in the lower limb veins; 2. Manual compression of the distal limb, the venous blood flow color filling enhancement disappears or weakens.

[0132] As shown in Figure 10, A: normal popliteal vein color Doppler image, B: normal femoral vein color Doppler image; Under normal circumstances, the blood flow in the vein lumen of the lower limbs is well filled.

[0133] As shown in Figure 11, A: Color Doppler image of partial femoral vein embolism: there is a filling defect in the venous lumen, discontinuous blood flow filling, and only a narrow blood flow signal filling is seen; B: Color Doppler image of complete femoral vein embolism: there is no blood flow filling in the lower limb vein

[0134] Under spectral Doppler conditions:

[0135] Under normal circumstances: 1. The spectrum of the lower limb veins, that is, the blood flow velocity will change with breathing; 2. The blood flow in the fatigue test will show a reverse spectrum, which lasts no more than 0.5s.

[0136] In the case of lower limb venous thrombosis: 1. The spectrum of the lower limb veins, that is, the change in blood flow velocity with breathing disappears; 2. The fatigue test reaction disappears.

[0137] As shown in Figure 12, A: Spectral Doppler image of normal femoral vein; B: Spectral Doppler image of femoral vein with thrombus at the proximal end:

[0138] Under normal circumstances, the waveform of the lower limb venous spectrum is affected by respiration and the amplitude varies;

[0139] When thrombus appears at the proximal end of the lower limb vein, the spectral waveform of the lower limb vein disappears with the change of breathing.

[0140] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A monitoring system for detecting lower extremity venous thrombosis, comprising: A signal acquisition module and an ultrasonic hardware system; The signal acquisition module transmits and receives ultrasonic waves between multiple ultrasonic probes and the part to be examined, obtains ultrasonic detection data of the part to be examined, and forms an analog signal through 128 channels in the ultrasonic probe, and transmits the ultrasonic detection data to the ultrasonic hardware system; The ultrasonic hardware system includes a multiplexing module, an analog signal processing module, a beamforming module, and a host computer module; Wherein Multiplexing module: receives the 128-channel analog signals output by multiple ultrasonic probes transmitted by the signal acquisition module, and selects one from the 128-channel analog signals output by multiple ultrasonic probes, only allowing the 128-channel analog signal of the selected probe to pass through, and transmits the 128-channel analog signal to the analog signal processing module; the selection of multiple ultrasonic detection data is based on the observation requirements of the actual detection site; Analog signal processing module: The selected 128-channel analog signal enters the analog signal processing module. Each analog signal will go through low-noise amplification, noise reduction filtering, variable gain amplification, analog-to-digital signal conversion, and finally be converted into digital 128-channel 12-bit channel data and transmitted to the beamforming module; Beamforming module: The digital 128-channel 12-bit channel data is input into the beamforming module. According to the delay time calculated by the system, each channel data is compensated for delay, so that the digital 128-channel 12-bit channel data after compensation is phase-aligned, and then by cumulative operation, the digital 128-channel 12-bit channel data after delay compensation is synthesized into one data, and IQ demodulation and low-pass filtering are performed on the synthesized beam signal data to obtain baseband IQ data within a certain bandwidth range, Perform image preprocessing on the baseband IQ data, including envelope extraction and logarithmic compression, and finally obtain displayable image data, and the processed image data is transmitted to the host computer module; Host computer module: Displays the processed digital signal in the form of image data on the host computer.

2. The monitoring system for detecting lower limb venous thrombosis according to claim 1, characterized in that: The host computer can be a display.

3. The monitoring system for detecting lower extremity venous thrombosis according to claim 1, characterized in that: The host computer module performs interactive control on the ultrasonic hardware system, specifically controls the multiplexing module, and selects the incoming analog signal.

4. A monitoring system for detecting lower limb venous thrombosis according to claim 3, characterized in that: The host computer module issues commands to the ultrasonic hardware system, and further controls the signal acquisition module to collect signals. The acquisition method is that the user controls the start of the multiple probe scanning function through the host computer module.

5. A monitoring system for detecting lower limb venous thrombosis according to claim 1, characterized in that: The host computer module sends commands to the ultrasound hardware system via WIFI. Command 1 allows the multiplexer to select only probe 1, scan for S seconds, rest for G seconds, and the image of probe 1 is uploaded to the host computer in real time. Then command 2 allows the multiplexer to select only probe 2, scan for S seconds, rest for G seconds, and the image of probe 2 is uploaded to the host computer in real time. Finally, command 3 allows the multiplexer to select only probe 3, scan for S seconds, rest for G seconds, and the image of probe 3 is uploaded to the host computer in real time. Then the host computer module controls the multiplexer to switch back to probe 1, and so on, until the time to start the three-probe scanning function exceeds T seconds, the software control system stops scanning, and the host computer module obtains the image data of the three probes respectively.

6. A monitoring device for detecting lower extremity venous thrombosis, comprising: Detection component, detection host (1) and host computer (2), in A detection component, the detection component comprising the signal acquisition module as claimed in claim 1, wherein the ultrasonic detection probe is a patch probe (3), one end of the probe (3) is connected to a data line (4), and is data-connected to a detection host (1) via a plug; The detection host (1) comprises a control mainboard (1008), a heat sink (1006), a power converter (1007) and a housing (1003); in The control mainboard (1008), the heat sink (1006), and the power converter (1007) are placed in the housing (1003). The control mainboard (1008) is loaded with the ultrasonic hardware system as claimed in claim 1, analyzes and processes various data, controls other electrical appliances in the device, and is responsible for information transmission; A host computer (2) is connected to the detection host (1) by signal and is used for displaying relevant images and information.

7. The monitor for detecting the formation of lower limb venous thrombosis according to claim 6, characterized in that: The housing (1003) is connected by means of a snap-on method, so that a cavity is formed inside the detection host. A naked switch (1001) is provided on one side of the housing (1003), which is the power switch of the detection host (1). One side of the housing (1003) is perforated with an interface (1002) for connecting with an external detection device to achieve signal transmission. The detection host (1) is provided with a battery (1005) inside, which is used to supply power to other electrical devices of the device.

8. A monitor for detecting lower limb venous thrombosis according to claim 6, characterized in that: The radiator (1006) is used to dissipate heat from the control mainboard (8) to prevent it from being overheated.

9. The monitor for detecting lower limb venous thrombosis according to claim 6, characterized in that: The power converter (1007) converts the electric energy during charging so that the electric energy is stored in the battery (1005).

10. A monitor for detecting lower limb venous thrombosis according to claim 6, characterized in that: The upper surface of the detection host (1) is provided with a connecting plate (5) and a supporting plate (6) for supporting the connecting plate; one side of the connecting plate (5) is rotatably connected to the detection host (1) and is connected to the host computer (2) by magnetic attraction.

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