A system for preventing lower extremity deep vein thrombosis and its use method
By using controllers, restraint belts and electrode tabs in the deep vein thrombosis system of the lower limbs, monitoring blood flow velocity and adjusting the intensity of current stimulation, the problem of inability to detect and prevent deep vein thrombosis in the lower limbs in a timely manner in the prior art, and blood treatment is achieved Real-time monitoring and prevention of flow conditions to avoid delays in treatment.
Patent Information
- Application Number
- CN202210574957.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-05-25
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2042-05-25
AI Technical Summary
The prior art cannot detect and prevent deep vein thrombosis in the lower limbs in a timely manner, resulting in less obvious treatment effects or delayed treatment.
Using a system including a controller, a restraint belt and an electrode sheet, the blood flow velocity is monitored through ultrasonic waves and current stimulation, a prompt is issued according to preset thresholds, and the pulse parameters of the electrode sheet are adjusted to adapt to blood flow changes, so as to achieve the vascular status of the lower limbs. real-time monitoring and prevention.
It can promptly prompt users and medical staff for possible deep venous thrombosis problems, avoid treatment delays, and automatically adjust the intensity of current stimulation to achieve closed-loop control of blood flow velocity and flow, and prevent the formation of deep venous thrombosis in the lower limbs.
Smart Images
Figure CN114796867B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of medical devices, and in particular to a system for preventing lower extremity deep vein thrombosis and a method of using the system. Background Art
[0002] The formation of deep vein thrombosis in the lower extremities is a critical disease, and its incidence rate remains high in surgical wards. The causes of blood stasis include: long-term bed rest, trauma or fracture, major surgery, pregnancy, childbirth, long-distance car or airplane rides, or long periods of sitting and squatting. The above reasons can all lead to slow blood flow and stasis, thus triggering deep vein thrombosis in the lower extremities. After a lower extremity fracture, plaster or other fixation methods will immobilize the affected limb, restrict movement, and the calf muscles will not function normally, resulting in slow blood flow and stasis, which leads to a higher incidence of deep vein thrombosis in the lower extremities.
[0003] However, the existing method of preventing venous thrombosis is to electrically stimulate the patient's body parts through electrodes to cause passive muscle contraction, thereby preventing venous thromboembolism, but it is not possible to detect the patient's problem in time, resulting in the patient's treatment effect being unobvious or even delaying treatment. Summary of the invention
[0004] Based on this, the purpose of the present invention is to provide a system for preventing deep vein thrombosis in the lower limbs, which can promptly inform the user of the situation in the blood vessels and prevent deep vein thrombosis in the lower limbs.
[0005] The present invention is achieved through the following technical solutions:
[0006] A system for preventing deep vein thrombosis of lower limbs comprises a controller, wherein an ultrasonic transmitter for transmitting ultrasonic waves and an ultrasonic receiver for receiving ultrasonic echoes are provided on a first side of the controller; a restraint belt and an electrode sheet, wherein the restraint belt is arranged on the first side of the controller, and the electrode sheet is arranged on a side of the restraint belt facing away from the controller and is electrically connected to the controller, and the restraint belt is used to hold the electrode sheet close to the muscle at the stimulation site; the controller is used to apply a pulse voltage to the electrode sheet so that the electrode sheet generates electric current stimulation to the muscle, and control the ultrasonic transmitter to transmit ultrasonic waves to the blood vessels at the stimulation site, and then calculate the blood flow velocity according to the echo of the ultrasonic wave received by the ultrasonic receiver, and compare the blood flow velocity with a preset first threshold and a second threshold, and when the blood flow velocity is less than the first threshold, a first prompt is issued; when the blood flow velocity is greater than the second threshold, a second prompt is issued; wherein, if the first threshold is less than the second threshold, the first prompt indicates that a certain degree of embolism has occurred, and the second prompt indicates that the blood flow velocity is too fast.
[0007] Compared with the prior art, the present invention generates electric current stimulation to the user's muscles while issuing corresponding prompts based on the blood flow conditions in the user's blood vessels, so that the user, his / her family members and medical staff can timely understand and grasp the user's physical condition, thereby promptly discovering possible deep vein thrombosis problems in the user to avoid delaying treatment.
[0008] Furthermore, the controller is also used to adjust the pulse parameters of the current stimulation generated by the electrode sheet when the blood flow velocity is greater than the first threshold and less than the second threshold, so as to adjust the intensity of the current stimulation to the muscle, wherein the pulse parameters include start time, duration, and interval time.
[0009] Furthermore, the controller is also used to compare the change amplitude of the pulse parameter with a first preset value, and at the same time compare the change amplitude of the blood flow velocity caused by the change of the pulse parameter with a second preset value. When the change amplitude of the pulse parameter is greater than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, the current stimulation intensity generated by the electrode sheet is maintained; when the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, the current stimulation intensity generated by the electrode sheet is reduced; when the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is less than the second preset value, the current stimulation intensity generated by the electrode sheet is increased; when the change amplitude of the pulse parameter is greater than the first preset value, and the change amplitude of the blood flow velocity is less than the second preset value, a third prompt is issued to indicate that the user has a blood flow problem.
[0010] Furthermore, the controller is also used for frequency selection to remove signals in non-target frequency domains present in the feedback signal.
[0011] Furthermore, the controller is also used to set the blood flow velocity detected under the condition that the ultrasonic emitter emits ultrasonic waves with a first frequency as the first detected blood flow velocity; and set the blood flow velocity detected under the condition that the ultrasonic emitter emits ultrasonic waves with a second frequency as the second detected blood flow velocity; and then add the first detected blood flow velocity and the second detected blood flow velocity and take the average value to obtain the final blood flow velocity.
[0012] Furthermore, the controller is detachably connected to the restraining belt via a magnetic attraction device.
[0013] Furthermore, a first fastener is provided at the end of the restraining belt on the same side as the electrode sheet, and a second fastener is provided at the end on the other side to be fastened with the first fastener.
[0014] In addition, the present invention also provides a method for using the above system for preventing lower extremity deep vein thrombosis, comprising the following steps:
[0015] S01: Wrap the restraint band around the user's lower limbs so that the electrode sheet adheres to the user's skin and is aligned with the muscle at the stimulation site;
[0016] S02: applying a pulse voltage to the electrode sheet through a controller to generate current stimulation to the muscles at the stimulation site; and controlling the ultrasonic transmitter through the controller to transmit ultrasonic waves to the blood vessels near the stimulation site;
[0017] S03: The controller calculates the blood flow velocity according to the echo of the ultrasonic wave received by the ultrasonic wave receiving electrode;
[0018] S04: The blood flow velocity is compared with a preset first threshold and a second threshold through the controller. When the blood flow velocity is less than the first threshold, a first prompt is issued; when the blood flow velocity is greater than the second threshold, a second prompt is issued; wherein, the first threshold is less than the second threshold, the first prompt indicates that a certain degree of embolism has occurred, and the second prompt indicates that the blood flow velocity is too fast.
[0019] Furthermore, step S04 also includes:
[0020] When the blood flow velocity is greater than the first threshold value and less than the second threshold value, the controller adjusts the pulse parameter to a new pulse parameter, and then compares the change amplitude of the pulse parameter with the first preset value, and at the same time compares the change amplitude of the blood flow velocity caused by the change of the pulse parameter with the second preset value. When the change amplitude of the pulse parameter is greater than the first preset value and the change amplitude of the blood flow velocity is greater than the second preset value, the controller maintains the current stimulation intensity generated by the electrode sheet; when the change amplitude of the pulse parameter is less than the first preset value and the change amplitude of the blood flow velocity is greater than the second preset value, the controller reduces the current stimulation intensity generated by the electrode sheet; when the change amplitude of the pulse parameter is less than the first preset value and the change amplitude of the blood flow velocity is less than the second preset value, the controller increases the current stimulation intensity generated by the electrode sheet; when the change amplitude of the pulse parameter is greater than the first preset value and the change amplitude of the blood flow velocity is less than the second preset value, the controller issues a third prompt to indicate that the user has a blood flow problem.
[0021] Furthermore, the method for preventing lower extremity deep vein thrombosis based on blood flow monitoring also includes:
[0022] S05: The controller records the corresponding relationship between the pulse parameters and the blood flow velocity during the use time.
[0023] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 A front view of the system for preventing lower extremity deep vein thrombosis according to the present invention;
[0025] Figure 2 A rear view of the system for preventing lower extremity deep vein thrombosis according to the present invention;
[0026] Figure 3 A schematic diagram of the structure of a controller in a system for preventing deep vein thrombosis of lower extremities according to the present invention;
[0027] Figure 4 A schematic diagram of a process for preventing lower extremity deep vein thrombosis according to the present invention;
[0028] Figure numerals: 10 - controller, 100 - ultrasonic transmitter, 102 - ultrasonic receiver, 104 - display screen, 20 - restraint belt, 30 - electrode sheet, 40 - magnetic device. DETAILED DESCRIPTION
[0029] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0030] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.
[0031] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0032] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0033] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.
[0034] See also Figure 1-2 On the one hand, the present invention provides a system for preventing deep vein thrombosis of the lower extremities based on blood flow monitoring, including a controller 10, an ultrasonic transmitter 100 and an ultrasonic receiver 102 arranged on the first side of the controller 10, a restraint belt 20 arranged on the controller 10 and on the same side as the ultrasonic transmitter 100 and the ultrasonic receiver 102, and three electrode sheets 30 arranged on the restraint belt 20, wherein the ultrasonic transmitter 100 and the ultrasonic transmitter 102 can be integrated on the controller 10, or can be independent functional components and electrically connected to the controller 10 through a wire. The restraint belt 20 can be arranged on the first side of the controller 10 by directly fixing it on the first side of the controller 10, or ... Figure 1 As shown, it is detachably fixed to the first side of the controller via a magnetic attraction device 40.
[0035] Furthermore, a first fastener (not shown) is provided at the end of the restraint belt 20 on the same side as the electrode sheet 30, and a second fastener (not shown) connected to the first fastener (not shown) is provided at the end of the other side. Preferably, the first fastener (not shown) and the second fastener (not shown) are Velcro used in conjunction.
[0036] When in use, the user or the user's family wraps the strap 20 around the user's lower limbs (mainly the thigh or calf) and makes the electrode sheet 30 attached to the user's skin and aligned with the muscle of the stimulation site. The position of the electrode sheet 30 is fixed by the buckle of the first fastener (not shown) and the second fastener (not shown), and the ultrasonic emitter 100 and the ultrasonic emitter 100 are aligned with the blood vessels near the stimulation site. The strap 20 is preferably made of elastic material and can be used by different people. The controller 10 is started. The controller 10 applies a 24V positive and negative pulse voltage to the electrode sheet 30 according to the user's operation. The electrode sheet 30 forms a pulse current to the stimulation site of the fitting part, wherein the stimulation intensity of the generated pulse signal is controlled within the range of 25mA-30mA, the pulse width is 200μs-550μs, and the period is 1 second. At the same time, the controller 10 controls the ultrasonic emitter 100 to emit ultrasonic waves to the blood vessels at the stimulation site. Due to the blood flow in the blood vessels, the ultrasonic waves are reflected by the blood flowing in the blood vessels, and a Doppler effect is generated to obtain a feedback signal. The controller 10 calculates the blood flow velocity according to the echo of the ultrasonic wave received by the ultrasonic transmitter 100, which is the first blood flow velocity; then compares the first blood flow velocity with the preset first threshold and second threshold, wherein the first threshold is less than the second threshold;
[0037] When the first blood flow velocity is less than the first threshold, a first prompt is issued, indicating that the user has developed a certain degree of thrombus; when the second blood flow velocity is greater than the second threshold, a second prompt is issued, indicating that the user's blood flow velocity is too fast.
[0038] Furthermore, when the first blood flow velocity is greater than the first threshold value and less than the second threshold value, the controller 10 adjusts the pulse parameters of the stimulation generated by the electrode sheet 30 to adjust the intensity of the current stimulation to the muscle. Among them, the pulse parameters include the start time, duration and interval time of the current stimulation. The first threshold and the second threshold can be set according to existing medical standards or the advice of medical staff. In this specific embodiment, the first threshold is 5cm / s and the second threshold is 30cm / s. The first prompt and the second prompt can be warning lights of different colors or text messages.
[0039] See also Figure 3 As an implementation mode of the present invention, the controller 10 specifically includes a calculation unit, a pulse unit, a monitoring unit, a regulating unit and an information feedback unit.
[0040] The calculation unit is used to calculate the blood flow velocity according to the echo of the ultrasound wave received by the ultrasound receiving electrode 102;
[0041] A pulse unit, used for applying a pulse voltage to the electrode sheet 30, so that the electrode sheet 30 generates current stimulation according to a preset first pulse parameter;
[0042] Monitoring unit: used to compare the blood flow velocity with the preset first threshold and second threshold,
[0043] When the blood flow velocity is less than the first threshold, generating a first control instruction;
[0044] When the blood flow velocity is greater than the second threshold, generating a second control instruction;
[0045] When the blood flow velocity is greater than the first threshold value and less than the second threshold value, generating an adjustment instruction;
[0046] An adjustment unit, used for adjusting pulse parameters according to an adjustment instruction;
[0047] The information feedback unit is used to issue a first prompt according to a first control instruction, or to issue a second prompt according to a second control instruction.
[0048] When working, the calculation unit of the controller 10 calculates the blood flow velocity according to the echo of the ultrasound wave received by the ultrasound transmitter 100, which is the first blood flow velocity; the monitoring unit compares the first blood flow velocity calculated by the calculation unit with the preset first threshold value and the second threshold value:
[0049] When the first blood flow velocity is less than the first threshold, a first control instruction is generated, and the information feedback unit issues a first prompt according to the first control instruction, indicating that the user has developed a certain degree of thrombus;
[0050] When the first blood flow velocity is greater than a second threshold, a second control instruction is generated, and the information feedback unit issues a second prompt according to the second control instruction, indicating that the blood flow velocity of the user is too fast;
[0051] When the first blood flow velocity is greater than the first threshold value and less than the second threshold value, an adjustment instruction is generated, and the pulse unit adjusts the first pulse parameter of the current stimulation generated by the electrode sheet 30 to the second pulse parameter according to the adjustment instruction. Since the pulse parameter changes, the blood flow velocity changes, and thus the second blood flow velocity is obtained. At this time, the monitoring unit compares the change amplitude between the first pulse parameter and the second pulse parameter with the first preset value, and compares the change amplitude between the second blood flow velocity and the first blood flow velocity with the second preset value:
[0052] When the change amplitude of the pulse parameter is greater than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, a first execution instruction is generated; the adjustment unit maintains the second pulse parameter according to the first execution instruction to maintain the current stimulation intensity generated by the electrode sheet 30;
[0053] When the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, a second execution instruction is generated, and the adjustment unit adjusts the second pulse parameter according to the second execution instruction to reduce the intensity of the current stimulation generated by the electrode sheet 30;
[0054] When the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is less than the second preset value, a third execution instruction is generated, and the adjustment unit adjusts the second pulse parameter according to the third execution instruction to increase the current stimulation intensity generated by the electrode sheet 30;
[0055] When the change amplitude of the pulse parameter is greater than the first preset value and the change amplitude of the blood flow velocity is less than the second preset value, a fourth execution instruction is generated, and the information feedback unit issues a third prompt according to the fourth execution instruction, prompting the user that there is a problem of poor blood flow.
[0056] The first preset value and the second preset value can be set according to existing medical standards or the advice of medical staff. In this embodiment, the first preset value is 20% and the second preset value is 5%. Here, the third prompt can be a warning light with a specific color or a text message.
[0057] Since Doppler signals are generally below 4500 Hz, the feedback signal obtained after ultrasound enters the blood vessel mainly contains two non-target frequency domain signals: (1) 2 times the main frequency signal of the sound wave; (2) the echo signal of the blood vessel wall below 200 Hz caused by the influence of blood vessel occlusion. These signals are mixed in the effective signal, affecting the analysis of the target frequency domain signal.
[0058] To solve this problem, as an embodiment of the present invention, the computing unit of the controller 10 is also used for frequency selection to remove the signal of the non-target frequency domain in the feedback signal. The frequency selection method can be to use a filter or to filter out the signal of the non-target frequency domain by using an algorithm. In this embodiment, the frequency selection is performed by FFT operation (Fast Fourier Transform) and inverse operation.
[0059] Due to the complex tissue structure near human blood vessels, the blood flow velocity calculated based on a single ultrasonic frequency is less accurate. To solve this problem, the inventors found during the experiment that piezoelectric ceramic ultrasonic waves can vibrate at multiple frequencies. Therefore, as an embodiment of the present invention, the ultrasonic emitter 100 of the present invention is a piezoelectric ceramic ultrasonic emitter, and the ultrasonic emitter 100 is a piezoelectric ceramic ultrasonic receiver, which generates ultrasonic waves at two or more frequencies, and then passes through the calculation unit of the controller 10:
[0060] The blood flow velocity detected under the condition that the ultrasonic transmitter 100 emits ultrasonic waves with a first frequency is set as the first detection blood flow velocity;
[0061] The blood flow velocity detected under the condition that the ultrasonic transmitter 100 emits ultrasonic waves with a second frequency is set as the second detected blood flow velocity;
[0062] Then the first detected blood flow velocity and the second detected blood flow velocity are added together and the average value is taken to obtain the blood flow velocity.
[0063] The value of the blood flow velocity calculated by generating ultrasonic waves at two or more frequencies is more accurate than the value of the blood flow velocity calculated by generating ultrasonic waves at only one frequency.
[0064] The present invention automatically adjusts the pulse parameters according to the blood flow velocity in the user's blood vessels, thereby adjusting the current stimulation intensity generated by the electrode sheet 30. In order to enable medical staff to understand the user's blood vessel conditions, as an embodiment of the present invention, the information feedback unit of the present invention is also used to generate prompt information, and upload the prompt information to the server through any method of wifi, Bluetooth or wired network, to ask medical staff for further diagnosis. Preferably, the second side of the controller 10 of the present invention opposite to the first side is provided with a display screen 104 for displaying prompt information, so that the user and his family can understand their blood vessel conditions in a timely manner.
[0065] Furthermore, in order to record the changing patterns of the user's blood flow under different pulse parameters in the process of using the system of the present invention in the form of data for reference by medical staff, as an embodiment of the present invention, the controller 10 of the present invention also includes a recording unit for recording the corresponding relationship between the changes in the pulse parameters (including start time, duration and interval time) of the pulse unit and the changes in blood flow velocity during the use time, and uploading it to the server through the information feedback unit for reference by medical staff to determine the vascular occlusion status of the user.
[0066] On the other hand, the present invention also provides Figure 4 A method for using the above-mentioned system for preventing lower extremity deep vein thrombosis is shown, comprising the following steps:
[0067] S01: Wrap the restraint belt 20 around the user's lower limbs, so that the electrode sheet 30 is attached to the user's skin and is aligned with the muscle at the stimulation site;
[0068] S02: applying a pulse voltage to the electrode sheet 30 through the controller 10 to generate current stimulation to the muscles at the stimulation site; and controlling the ultrasonic transmitter 100 through the controller 10 to transmit ultrasonic waves to the blood vessels near the stimulation site;
[0069] S03: The controller 10 calculates the blood flow velocity according to the echo of the ultrasound wave received by the ultrasound receiving electrode 102;
[0070] S04: The blood flow velocity is compared with a preset first threshold and a second threshold through the controller 10. When the blood flow velocity is less than the first threshold, a first prompt is issued; when the blood flow velocity is greater than the second threshold, a second prompt is issued; wherein, if the first threshold is less than the second threshold, the first prompt indicates that a certain degree of embolism has occurred, and the second prompt indicates that the blood flow velocity is too fast.
[0071] Furthermore, step S04 of the method of using the present invention further includes:
[0072] When the blood flow velocity is greater than the first threshold value and less than the second threshold value, the pulse parameter is adjusted to a new pulse parameter by the controller 10, and then the change amplitude of the pulse parameter is compared with the first preset value, and the change amplitude of the blood flow velocity caused by the change of the pulse parameter is compared with the second preset value:
[0073] When the change amplitude of the pulse parameter is greater than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, the current stimulation intensity generated by the electrode sheet is maintained by the controller;
[0074] When the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, the controller 10 reduces the current stimulation intensity generated by the electrode sheet;
[0075] When the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is less than the second preset value, the controller 10 increases the current stimulation intensity generated by the electrode sheet;
[0076] When the change amplitude of the pulse parameter is greater than the first preset value, and the change amplitude of the blood flow velocity is less than the second preset value, the controller 100 issues a third prompt to indicate that the user has a problem with poor blood flow.
[0077] Preferably, the method of use of the present invention further comprises:
[0078] S05: The controller 10 records the corresponding relationship between the pulse parameters and the blood flow velocity during the use time, and provides it to medical staff as a basis for analysis and diagnosis.
[0079] Compared with the prior art, the system of the present invention, while generating electric current stimulation to the user's muscles, issues corresponding prompts according to the blood flow conditions in the user's blood vessels, and automatically adjusts the pulse parameters according to the blood velocity and flow rate in the user's lower limb blood vessels, thereby adjusting the intensity of electrical stimulation to the muscles, and realizing closed-loop control of the blood velocity and flow rate in the blood vessels, thereby achieving the effect of preventing deep vein thrombosis in the lower limbs. In addition, the system of the present invention adjusts the pulse parameters to adapt to the user's blood vessel conditions based on the comparison results of the amplitude of the pulse parameter change with the preset value, and the comparison results of the amplitude of the blood flow velocity change caused by the pulse parameter change with the preset value. When there is a situation of poor blood flow, a prompt will be issued and a prompt message will be generated, so that the user and medical staff can know the user's own status in time, so that the user's possible deep vein thrombosis problem can be discovered in time to avoid delaying treatment.
[0080] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.
Claims
1. A system for preventing deep vein thrombosis of lower extremities, characterized in that: include: A controller, wherein a first side of the controller is provided with an ultrasonic transmitter for transmitting ultrasonic waves and an ultrasonic receiver for receiving ultrasonic echoes; A strap and an electrode sheet, wherein the strap is arranged on a first side of the controller, the electrode sheet is arranged on a side of the strap facing away from the controller and is electrically connected to the controller, and the strap is used to place the electrode sheet close to the muscle at the stimulation site; The controller is used to apply a pulse voltage to the electrode sheet so that the electrode sheet generates electric current stimulation to the muscle, and control the ultrasonic transmitter to transmit ultrasonic waves to the blood vessels at the stimulation site, and then calculate the blood flow velocity according to the echo of the ultrasonic wave received by the ultrasonic receiver, and compare the blood flow velocity with a preset first threshold and a second threshold. When the blood flow velocity is less than the first threshold, a first prompt is issued; when the blood flow velocity is greater than the second threshold, a second prompt is issued; wherein, if the first threshold is less than the second threshold, the first prompt indicates that a certain degree of embolism has occurred, and the second prompt indicates that the blood flow velocity is too fast; The controller is further used to adjust the pulse parameters of the current stimulation generated by the electrode sheet to adjust the intensity of the current stimulation to the muscle when the blood flow velocity is greater than the first threshold value and less than the second threshold value, wherein the pulse parameters include the start time, duration and interval time of the current stimulation; The controller is also used to compare the change amplitude of the pulse parameter with a first preset value, and to compare the change amplitude of the blood flow velocity caused by the change of the pulse parameter with a second preset value. When the change amplitude of the pulse parameter is greater than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, the current stimulation intensity generated by the electrode sheet is maintained; when the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is greater than the second preset value, the current stimulation intensity generated by the electrode sheet is reduced; when the change amplitude of the pulse parameter is less than the first preset value, and the change amplitude of the blood flow velocity is less than the second preset value, the current stimulation intensity generated by the electrode sheet is increased; when the change amplitude of the pulse parameter is greater than the first preset value, and the change amplitude of the blood flow velocity is less than the second preset value, a third prompt is issued to indicate that the user has a blood flow problem.
2. The system for preventing lower extremity deep vein thrombosis according to claim 1, characterized in that: The controller is also used for frequency selection to remove signals in non-target frequency domains present in the ultrasonic echo.
3. The system for preventing lower extremity deep vein thrombosis according to claim 2, characterized in that: The controller is also used to set the blood flow velocity detected under the condition that the ultrasonic emitter emits ultrasonic waves with a first frequency as the first detected blood flow velocity; and set the blood flow velocity detected under the condition that the ultrasonic emitter emits ultrasonic waves with a second frequency as the second detected blood flow velocity; and then add the first detected blood flow velocity and the second detected blood flow velocity and take the average value to obtain the final blood flow velocity.
4. The system for preventing lower extremity deep vein thrombosis according to claim 1, characterized in that: The controller is detachably connected to the restraining belt via a magnetic attraction device.
5. The system for preventing lower extremity deep vein thrombosis according to claim 1, characterized in that: The end of the restraining belt on the same side as the electrode sheet is provided with a first fastener, and the end on the other side is provided with a second fastener that is fastened with the first fastener.