Auxiliary device for preventing joint contracture

Abstract

The invention relates to an auxiliary device for preventing joint contracture. The auxiliary device comprises an upper arm fixing plate, a front arm fixing plate, a rotating seat, a rear extending plate, a front limiting rope and a rear limiting rope. An upper arm fixing sleeve is arranged on the inner side of the upper arm fixing plate; a forearm fixing sleeve is arranged on the inner side of the forearm fixing plate; the rotating seat is used for rotationally connecting the upper arm fixing plate and the front arm fixing plate and is provided with an angle sensor; one end of the rear extension plate is connected with the forearm fixing plate, and the other end crosses the rotating seat and extends behind the forearm fixing plate; the two ends of the front limiting rope are connected to the upper arm fixing sleeve and the front arm fixing sleeve respectively; the two ends of the rear limiting cable are connected to the upper arm fixing plate and the rear end of the rear extending plate respectively. Compared with the prior art, the device can effectively prevent joint contracture caused by ankylosis, ectopic ossification and the like at the elbow joint of a patient due to trauma after elbow joint fracture and dislocation; and muscle training treatment is carried out by utilizing a myoelectricity biofeedback technology, so that the patient is helped to reconstruct and recover normal movement functions of muscles required by elbow joint movement.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices and relates to an auxiliary device for preventing joint contracture, and in particular to an auxiliary device for preventing joint contracture after elbow fracture and dislocation surgery. Background Art

[0002] Elbow stiffness and contracture are one of the more common complications of orthopedic rehabilitation. Common vegetative state, long-term bed rest or joint immobilization, upper limb fractures, soft tissue injuries, burns and other postoperative problems are also common and difficult to treat problems in orthopedic rehabilitation. After orthopedic surgery, the function cannot be restored, often leaving different degrees of limited joint movement, which greatly affects work and daily activities. For example, when the elbow flexion is limited to less than 130 degrees, the hand cannot be close to the mouth, making it impossible to take care of oneself when eating. If the elbow extension is limited to more than 40 degrees, it is not easy for the upper limbs to be put into the sleeves when dressing. Restoring elbow mobility is a tricky problem for patients, clinicians and rehabilitation therapists.

[0003] After elbow fracture and dislocation surgery, patients are usually required to perform elbow flexion and extension training to prevent elbow stiffness and contracture. However, the degree of training, that is, the range of motion of the elbow, is difficult to guarantee with the patient's subjective consciousness, and excessive flexion and extension will lead to secondary injury of the elbow. Therefore, an auxiliary device for preventing joint contracture is needed to warn and ensure that patients perform rehabilitation training within a reasonable range guided by doctors. Summary of the invention

[0004] The purpose of the present invention is to provide an auxiliary device for preventing joint contracture, which is used for comprehensively preventing joint contracture in patients after elbow fracture and dislocation surgery.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An auxiliary device for preventing joint contracture, comprising:

[0007] An upper arm fixing plate, with an upper arm fixing sleeve provided on the inner side for fixing the upper arm;

[0008] A forearm fixing plate, with a forearm fixing sleeve provided on the inner side for fixing the forearm;

[0009] A rotating seat is used to rotatably connect the upper arm fixing plate and the forearm fixing plate, and an angle sensor is provided at the rotating connection;

[0010] A rear extension plate, one end of which is connected to the forearm fixing plate, and the other end of which extends beyond the rotating seat to the rear of the forearm fixing plate;

[0011] A front limiting cable, with two ends respectively connected to the upper arm fixing sleeve and the forearm fixing sleeve;

[0012] The two ends of the rear limit rope are respectively connected to the upper arm fixing plate and the rear end of the rear extension plate.

[0013] Further, the upper arm fixing sleeve and the forearm fixing sleeve each include a first strap and a second strap connected to the corresponding fixing plate;

[0014] The end of the first strap is provided with a connecting ring, the outer side of the end of the second strap is provided with a fitting portion, and the outer side of the second strap is also provided with a fitting matching portion, so that

[0015] The end of the second binding belt passes through the connecting ring and is folded backward from the outside, so that the fitting portion is connected with the fitting matching portion to form a fixing sleeve.

[0016] Furthermore, the fitting portion and the fitting matching portion are respectively the hook surface and the loop surface of the Velcro.

[0017] Furthermore, the front limiting cable is connected between the connecting ring of the upper arm fixing sleeve and the connecting ring of the forearm fixing sleeve.

[0018] Furthermore, one end of the front limiting cable is connected to one of the connecting rings, and the other end passes around the other connecting ring and is connected to the middle section of the front limiting cable through a fixing member;

[0019] The fixing part includes a fixing part body connected to one end of the front limiting cable, a through hole opened on the fixing part body and used for the middle section of the front limiting cable to pass through, a pulling rod sliding through the side wall of the through hole, a pressure seat arranged in the through hole and connected to the end of the pulling rod, and a compression spring arranged between the pressure seat and the side wall of the through hole; the pressure seat can clamp and fix the middle section of the front limiting cable between the pressure seat and the side wall of the through hole under the elastic pressure of the compression spring.

[0020] Further, a slide rail is provided on the rear side of the upper arm fixing plate, a slide seat is slidably provided on the slide rail, the slide rail extends along the length direction of the upper arm fixing plate, and a plurality of positioning holes are arranged at intervals on one side, a positioning pin is slidably provided on the slide seat, and the slide seat is limited on the slide rail by the plug-in cooperation of the positioning pin and the positioning hole;

[0021] One end of the rear limit rope is fixedly connected to the slide seat on the upper arm fixing plate, and the other end is fixedly connected to the rear end of the rear extension plate.

[0022] Furthermore, the front limiting rope or the rear limiting rope is a rope or an elastic belt.

[0023] Furthermore, the auxiliary device also includes an auxiliary telescopic rod, both ends of which are hinged to the upper arm fixing plate and the rear extension plate respectively.

[0024] Furthermore, the auxiliary telescopic rod is a telescopic electric cylinder, and the angle sensor is electrically connected to the auxiliary telescopic rod and the alarm via the controller. When the angle sensor detects that the rotation angle of the upper arm fixing plate and the forearm fixing plate exceeds a preset angle, an alarm signal is issued and the extension and retraction of the auxiliary telescopic rod is braked, so that the patient's elbow is bent and extended within a preset range.

[0025] Furthermore, the auxiliary device also includes an electromyographic feedback biotherapy device, and the electromyographic feedback biotherapy device includes:

[0026] The signal acquisition module is used to collect electromyographic signals through electrodes and convert the electrical signals generated by human muscle activity into processable electrical signals;

[0027] The signal processing module is used to amplify and filter the electromyographic signal collected by the signal collection module;

[0028] A digital-to-analog conversion module is used to convert the analog signal processed by the signal processing module into a digital signal;

[0029] The main control module is electrically connected to the digital-to-analog conversion module, and is used to form an elbow joint rehabilitation exercise treatment plan based on the input setting parameters, the collected electromyographic signals, and the built-in evaluation algorithm; and to determine the degree of elbow joint flexion based on the set elbow joint range of motion and the feedback electromyographic signals;

[0030] The electrical stimulation output module is provided with an electrode sheet and is electrically connected to the main control module, and is used to output a muscle electrical stimulation signal according to the treatment plan formed by the main control module, and adjust the intensity and frequency of the muscle electrical stimulation signal, so as to perform electrical stimulation treatment on the muscles at the elbow joint;

[0031] The electrical stimulation feedback module is electrically connected to the main control module through the signal processing module and the digital-to-analog conversion module in sequence, and is used to collect feedback information and feed it back to the main control module;

[0032] A display module, electrically connected to the main control module, for displaying treatment parameters and feedback information;

[0033] The human-computer interaction module is electrically connected to the main control module and is used to input and adjust parameters;

[0034] An alarm module is electrically connected to the main control module and is used to issue an alarm when the main control module determines that the degree of elbow flexion exceeds a set range of elbow joint movement;

[0035] A storage module, electrically connected to the main control module, and used for storing treatment data and electromyographic signals;

[0036] The power module is used to provide power. Preferably, the main control module is electrically connected to the angle sensor and the auxiliary telescopic rod.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention fixes the upper arm fixing plate to the outer side of the upper arm through the upper arm fixing sleeve, and fixes the forearm fixing plate to the outer side of the forearm through the forearm fixing sleeve, so that the upper arm fixing plate and the forearm fixing plate rotate with the elbow, and at this time the angle sensor can accurately monitor the rotation angle of the elbow; the front limit cable is arranged on the inner side of the rotation of the elbow to limit the maximum outward rotation angle of the elbow, and the rear limit cable is arranged on the outer side of the elbow to limit the maximum inward rotation angle of the elbow. For example, when the elbow joint is flexed and moved within a set range (0°~135°), the front limit cable and the rear limit cable are in a relaxed state and do not affect the movement of the elbow joint. When the movement exceeds the range, the limit cable on the corresponding side is straightened to limit the movement, thereby ensuring that the elbow joint is flexed and moved within the set range after surgery, avoiding further damage to the affected area, and thus effectively preventing joint contracture caused by joint stiffness, heterotopic ossification, etc. caused by trauma in the patient's elbow joint after elbow fracture and dislocation surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 , Figure 3 It is a schematic structural diagram of an auxiliary device for preventing joint contracture in an embodiment;

[0040] Figure 2 It is a schematic structural diagram of an auxiliary device for preventing joint contracture in an embodiment with the fixing sleeve opened;

[0041] Figure 4 , Figure 5 It is a schematic diagram of the assembly of the front limit cable and the fixing part;

[0042] Figure 6 It is a schematic diagram of the assembly of the slide seat and the slide rail;

[0043] Figure 7 It is a structural diagram of an electromyographic biofeedback therapeutic apparatus;

[0044] Figure 8 It is a schematic diagram of the assembly of the electromyographic biofeedback therapeutic device and the auxiliary telescopic rod;

[0045] Description of the markings in the figure:

[0046] 1-upper arm fixing plate, 2-forearm fixing plate, 3-rotating seat, 4-rear extension plate, 5-front limiting cable, 6-rear limiting cable, 7-upper arm fixing sleeve, 8-forearm fixing sleeve, 9-first strap, 10-second strap, 11-connecting ring, 12-fitting part, 13-fitting matching part, 14-fixing piece, 1401-through hole, 1402-pull rod, 1403-pressure seat, 1404-compression spring, 15-slide rail, 16-slide seat, 17-positioning hole, 18-positioning pin, 19-auxiliary telescopic rod, 20-electromyographic biofeedback therapeutic device. DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0050] Example:

[0051] like Figures 1 to 3 As shown, an auxiliary device for preventing joint contracture comprises: an upper arm fixing plate 1, a forearm fixing plate 2, a rotating seat 3, a rear extension plate 4, a front limiting cable 5 and a rear limiting cable 6. An upper arm fixing sleeve 7 is provided on the inner side of the upper arm fixing plate 1 for fixing the upper arm; a forearm fixing sleeve 8 is provided on the inner side of the forearm fixing plate 2 for fixing the forearm; the rotating seat 3 is used to rotatably connect the upper arm fixing plate 1 and the forearm fixing plate 2, and an angle sensor is provided at the rotating connection; one end of the rear extension plate 4 is connected to the forearm fixing plate 2, and the other end passes over the rotating seat 3 and extends to the rear of the forearm fixing plate 2; the two ends of the front limiting cable 5 are respectively connected to the upper arm fixing sleeve 7 and the forearm fixing sleeve 8; the two ends of the rear limiting cable 6 are respectively connected to the rear ends of the upper arm fixing plate 1 and the rear extension plate 4.

[0052] In this embodiment, the upper arm fixing plate 1 is fixed to the outer side of the upper arm by the upper arm fixing sleeve 7, and the forearm fixing plate 2 is fixed to the outer side of the forearm by the forearm fixing sleeve 8, so that the upper arm fixing plate 1 and the forearm fixing plate 2 rotate with the elbow. At this time, the angle sensor can accurately monitor the rotation angle of the elbow; the front limit cable 5 is arranged on the inner side of the elbow to limit the maximum outward rotation angle of the elbow, and the rear limit cable 6 is arranged on the outer side of the elbow to limit the maximum inward rotation angle of the elbow. Specifically, when the elbow joint is flexed within the set range (70°~90°), the front limit cable 5 and the rear limit cable 6 are in a relaxed state and do not affect the movement of the elbow joint. When the movement exceeds the range, the limit cable on the corresponding side is straightened to limit the movement, thereby ensuring that the elbow joint is flexed within the set range after surgery to avoid further damage to the affected area.

[0053] In some specific embodiments, an elbow support is also provided at the rotating seat 3 for supporting the elbow from the outside, and is preferably fixed at the olecranon of the ulna of the elbow joint.

[0054] In some specific embodiments, the upper arm fixing sleeve 7 and the forearm fixing sleeve 8 both include a first strap 9 and a second strap 10 connected to the corresponding fixing plate; a connecting ring 11 is provided at the end of the first strap 9, a fitting portion 12 is provided at the outer side of the end of the second strap 10, and a fitting matching portion 13 is also arranged on the outer side of the second strap 10, so that the end of the second strap 10 passes through the connecting ring 11 and is folded backward from the outer side, and the fitting portion 12 is connected to the fitting matching portion 13 to form a fixing sleeve. By adjusting the folding position of the second strap 10 and the fitting position of the fitting portion 12 and the fitting matching portion 13, the size of the fixing sleeve can be adjusted to adapt to the affected limbs of different arm circumferences and maintain a good fixing effect.

[0055] In some specific embodiments, the fitting portion 12 and the fitting matching portion 13 are respectively the hook surface and the fleece surface of Velcro. In other embodiments, the forearm fixing sleeve 8 and the upper arm fixing sleeve 7 can also fix the upper arm and the forearm through the structure of a belt and a belt buckle.

[0056] In some specific embodiments, the front limiting cable 5 is connected between the connecting ring 11 of the upper arm fixing sleeve 7 and the connecting ring 11 of the forearm fixing sleeve 8 .

[0057] In some more specific embodiments, Figure 4 and Figure 5 As shown, one end of the front limit cable 5 is connected to one of the connecting rings 11, and the other end passes through the other connecting ring 11 and is connected to the middle section of the front limit cable 5 through a fixing member 14; wherein the fixing member 14 includes a fixing member body connected to one end of the front limit cable 5, a through hole 1401 opened on the fixing member body and used for the middle section of the front limit cable 5 to pass through, a pull rod 1402 slidingly arranged on the side wall of the through hole, a pressure seat 1403 arranged in the through hole 1401 and connected to the end of the pull rod 1402, and a compression spring 1404 arranged between the pressure seat 1403 and the side wall of the through hole 1401; the pressure seat 1403 can clamp and fix the middle section of the front limit cable 5 between the pressure seat 1403 and the side wall of the through hole under the elastic pressure of the compression spring 1404. When in use, the limiting length of the front limiting cable 5 between the two connecting rings 11 can be adjusted by the fixing member 14, specifically, the pull rod 1402 is pulled outward to make the middle section of the front limiting cable 5 slide between the pressure seat 1403 and the side wall of the through hole until it reaches the distance between the connecting rings 11 corresponding to the set maximum outward rotation angle, and then the pull rod 1402 is loosened, and the pressure seat 1403 can press and fix the middle section of the front limiting cable 5. Preferably, the bottom of the pressure seat 1403 and the side wall of the through hole are respectively provided with anti-slip structures, including an anti-slip layer of materials such as rubber, and / or a concave-convex matching structure composed of multiple ridges and grooves.

[0058] In some specific embodiments, both ends of the front limiting cable 5 may also be connected to adjacent sides of the upper arm fixing plate 1 and the forearm fixing plate 2, for example Figure 1More specifically, an annular structure can be provided on the front side of the upper arm fixing plate 1 and the upper side of the forearm fixing plate 2, and they are connected by the same connecting ring 11.

[0059] In some specific embodiments, the connection between the fixing body and one end of the front limiting cable 5 includes bonding, or drilling a U-shaped hole on the fixing body, passing one end of the front limiting cable 5 through the hole and tying it to fix it.

[0060] In some specific embodiments, Figure 6 As shown, a slide rail 15 is provided on the rear side of the upper arm fixing plate 1, and a slide seat 16 is slidably provided on the slide rail 15. The slide rail 15 extends along the length direction of the upper arm fixing plate 1, and a plurality of positioning holes 17 are arranged at intervals on one side. A positioning pin 18 is slidably provided on the slide seat 16, and the slide seat 16 is limited on the slide rail 15 by the plugging and matching of the positioning pin 18 with the positioning hole 17; one end of the rear limit cable 6 is fixedly connected to the slide seat 16 on the upper arm fixing plate 1, and the other end is fixedly connected to the rear end of the rear extension plate 4. When in use, the limit length of the rear limit cable 6 between the upper arm fixing plate 1 and the rear end of the rear extension plate 4 can be adjusted by the slide rail 15 and the slide seat 16, specifically, the slide seat 16 is slid to the spacing corresponding to the set maximum inward rotation angle, and then the positioning pin 18 is inserted into the positioning hole 17 adjacent to the slide seat 16 at this time, so that the position of the slide seat 16 can be fixed, and then the relative rotation angle of the upper arm fixing plate 1 and the forearm fixing plate 2 can be limited by the fixed length of the rear limit cable 6.

[0061] In some preferred embodiments, the positioning hole 17 is arranged to be inclined downward.

[0062] In some specific embodiments, the front limiting cable 5 or the rear limiting cable 6 is a rope or an elastic band. When the maximum rotation angle is reached, the rope is a rigid brake, and the elastic band can gradually increase the active impedance through elasticity, thereby relatively flexible braking.

[0063] In some specific embodiments, the auxiliary device further includes an auxiliary telescopic rod 19, the two ends of which are respectively hinged to the upper arm fixing plate 1 and the rear extension plate 4. The auxiliary telescopic rod 19 can assist the patient's elbow joint to reciprocate and rotate and flex and extend by reciprocating extension.

[0064] In some specific embodiments, the auxiliary telescopic rod 19 is a telescopic electric cylinder, and the angle sensor is electrically connected to the auxiliary telescopic rod 19 and the alarm via the controller. When the angle sensor detects that the rotation angle of the upper arm fixing plate 1 and the forearm fixing plate 2 exceeds a preset angle, an alarm signal is issued and the extension of the auxiliary telescopic rod 19 is braked to allow the patient's elbow to bend and extend within a preset range.

[0065] In some specific embodiments, the auxiliary device also includes a display electrically connected to the angle sensor and the controller, for displaying at least one of the real-time activity angle of the elbow joint, the number of reciprocating rotations of the elbow joint, the angular force distance, and the estimated amount of movement based on the number of rotations and the average rotational work.

[0066] In some specific embodiments, biofeedback electrical components are also included and connected to a therapeutic device, such as a biofeedback therapeutic device, which uses electromyographic biofeedback technology and combines multiple electrical stimulation modes to perform muscle training therapy to improve muscle function and help patients rebuild and restore the normal movement function of the muscles required for elbow joint movement.

[0067] The functions of biofeedback electrical components are as follows: The feedback information used in electromyographic biofeedback is electromyographic signal. The principle is to amplify, filter, bidirectionally rectify and integrate the collected electromyographic signal, and use the integrated voltage to drive sound, light, electricity, digital and other display devices. Since the integrated voltage is proportional to muscle tension, the level of muscle tension or relaxation can be directly observed. Because skeletal muscle is controlled by voluntary nerves, electromyographic self-regulation is relatively easy to learn, the treatment method is also easier to be accepted by patients, and the effect is reliable.

[0068] In some specific embodiments, it also includes an electromyographic biofeedback biotherapy device 20, such as Figure 7 As shown, it includes

[0069] The signal acquisition module is used to collect electromyographic signals (sEMG) through electrodes and convert the weak electrical signals generated by human muscle activity into processable electrical signals;

[0070] The signal processing module performs a series of processing such as amplification and filtering on the electromyographic signals collected by the signal acquisition module for easy analysis and application; the human body surface is affected and acted upon by the external electric field and electromagnetic field to generate induced potential, which can be received by the signal acquisition module and form noise interference to the muscle electromyographic signals, with a relatively fixed frequency range. The signal processing module can eliminate the corresponding noise interference and improve the signal-to-noise ratio of the collected electromyographic signals;

[0071] The digital-to-analog conversion module converts the analog signal processed by the signal processing module into a digital signal so that it can be processed by a computer or digital circuit;

[0072] The main control module, usually composed of a microprocessor or microcontroller, is responsible for the control logic of the entire system, including signal processing, parameter adjustment and user interface interaction, etc. It is electrically connected to the digital-to-analog conversion module, and forms an elbow joint rehabilitation exercise treatment plan based on the input setting parameters, the collected electromyographic signals, and the built-in evaluation algorithm; the evaluation algorithm can limit the elbow joint flexion range based on the elbow joint function evaluation standards such as Flynn's elbow joint function standard; and judge the elbow joint flexion degree according to the elbow joint range of motion set by the medical staff or the patient and the feedback electromyographic signals;

[0073] The electrical stimulation output module is provided with an electrode sheet and is electrically connected to the main control module. It outputs a muscle electrical stimulation signal according to the treatment plan formed by the main control module and adjusts the intensity and frequency of the muscle electrical stimulation signal, thereby effectively performing electrical stimulation treatment on the muscles at the elbow joint;

[0074] The electrical stimulation feedback module has the same structure as the signal acquisition module and is electrically connected to the main control module through the signal processing module and the digital-to-analog conversion module in sequence, and is used to collect feedback information to the main control module and adjust the treatment plan according to the feedback information;

[0075] A display module, electrically connected to the main control module, for displaying treatment parameters and feedback information, which may be an LCD screen or a digital tube display;

[0076] The human-computer interaction module is electrically connected to the main control module and provides a user interface, allowing the user to input instructions, adjust parameters, and display the current stimulation parameters and myoelectric characteristic values; a touch screen can also be used, integrated with the display module;

[0077] Detection feedback module, detect the output status of the electrode, including short circuit and open circuit, to ensure the safety of treatment;

[0078] The alarm module takes timely control and issues an alarm when the electrode sheet is short-circuited or open-circuited, thereby increasing safety. The module is also electrically connected to the main control module, and issues an alarm when the main control module determines that the degree of elbow flexion exceeds the set range of elbow joint motion;

[0079] A storage module, electrically connected to the main control module, for storing treatment data and electromyographic signals for subsequent analysis and recording;

[0080] The power module provides stable power for the entire system, including converting AC power into DC power and powering the chips of each module.

[0081] In some specific embodiments, it may also include

[0082] The waveform modulation module is provided between the main control module and the electrical stimulation output module, and is used to generate and modulate the required low-frequency waveform signals, which can be used for electrical stimulation therapy;

[0083] The constant current power amplifier module performs power amplification on the intensity-adjusted signal to ensure that the signal can effectively act on the patient through the electrode sheet.

[0084] In some specific embodiments, the signal acquisition module, the electrical stimulation output module, and the electrical stimulation feedback module collect or output corresponding signals through electrode stickers. In some specific embodiments, after the electromyographic biofeedback collects the electrical signal, the contracted elbow joint is moved within the set safe joint movement range through the human-machine exchange module to passively increase the elbow joint range of motion.

[0085] In some specific embodiments, the main control module is electrically connected to the angle sensor and the auxiliary telescopic rod 19 to monitor the flexion state of the elbow joint and control the auxiliary telescopic rod 19 to assist the flexion of the elbow joint.

[0086] For patients who already have elbow contracture, the elbow joint can be passively moved within a set safety angle through the telescopic effect of the auxiliary telescopic rod 19.

[0087] When in use, the therapeutic device can be used to treat the elbow joint, and then the patient is asked to perform active joint movements within a certain range. The flexion and extension range of the elbow joint is preset and controlled according to the angle sensor and the front limit cable 5 and the rear limit cable 6. When the angle of the patient's elbow joint movement exceeds the preset angle, the device will sound an alarm, or limit it through the front limit cable 5 and the rear limit cable 6. At the same time, according to the angle displayed on the display, the patient is reminded to control the angle of the elbow joint movement within a safe range.

[0088] This embodiment targets the numerous factors that may cause joint contracture in patients after elbow fracture and dislocation surgery, and conducts multi-faceted and multi-strategic interventions to prevent joint stiffness. At the same time, the equipment is safe and easy to use, and develops the rehabilitation after elbow fracture and dislocation surgery from being blind, non-standardized, and having safety risks to being refined, accurate, digital, and visual and adjustable at any time.

[0089] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An auxiliary device for preventing joint contracture, characterized in that: include: An upper arm fixing plate (1) is provided with an upper arm fixing sleeve (7) on its inner side for fixing the upper arm; A forearm fixing plate (2) is provided with a forearm fixing sleeve (8) on the inner side thereof for fixing the forearm; A rotating seat (3) is used to rotationally connect the upper arm fixing plate (1) and the forearm fixing plate (2), and an angle sensor is provided at the rotating connection; A rear extension plate (4), one end of which is connected to the forearm fixing plate (2), and the other end of which passes over the rotating seat (3) and extends to the rear of the forearm fixing plate (2); The front limiting cable (5) has two ends respectively connected to the upper arm fixing sleeve (7) and the forearm fixing sleeve (8); The two ends of the rear limit rope (6) are respectively connected to the upper arm fixing plate (1) and the rear end of the rear extension plate (4).

2. The auxiliary device for preventing joint contracture according to claim 1, characterized in that: The upper arm fixing sleeve (7) and the forearm fixing sleeve (8) both include a first binding strap (9) and a second binding strap (10) connected to the corresponding fixing plates; The end of the first binding strap (9) is provided with a connecting ring (11), the outer side of the end of the second binding strap (10) is provided with a fitting portion (12), and the outer side of the second binding strap (10) is also provided with a fitting matching portion (13), so that: The end of the second binding belt (10) passes through the connecting ring (11) and is folded backward from the outside, so that the fitting part (12) is connected to the fitting matching part (13) to form a fixing sleeve.

3. The auxiliary device for preventing joint contracture according to claim 2, characterized in that: The fitting portion (12) and the fitting matching portion (13) are respectively the hook surface and the fleece surface of the Velcro.

4. The auxiliary device for preventing joint contracture according to claim 2, characterized in that: The front limiting cable (5) is connected between a connecting ring (11) of the upper arm fixing sleeve (7) and a connecting ring (11) of the forearm fixing sleeve (8).

5. The auxiliary device for preventing joint contracture according to claim 4, characterized in that: One end of the front limiting cable (5) is connected to one of the connecting rings (11), and the other end passes through the other connecting ring (11) and is connected to the middle section of the front limiting cable (5) through a fixing member (14); The fixing member (14) includes a fixing member body connected to one end of the front limiting cable (5), a through hole (1401) opened on the fixing member body and used for the middle section of the front limiting cable (5) to pass through, a pull rod (1402) slidingly arranged on the side wall of the through hole, a pressure seat (1403) arranged in the through hole (1401) and connected to the end of the pull rod (1402), and a compression spring (1404) arranged between the pressure seat (1403) and the side wall of the through hole (1401); the pressure seat (1403) can clamp and fix the middle section of the front limiting cable (5) between the pressure seat (1403) and the side wall of the through hole under the elastic pressure of the compression spring (1404).

6. The auxiliary device for preventing joint contracture according to claim 1, characterized in that: A slide rail (15) is provided on the rear side of the upper arm fixing plate (1), a slide seat (16) is slidably provided on the slide rail (15), the slide rail (15) extends along the length direction of the upper arm fixing plate (1), and a plurality of positioning holes (17) are arranged at intervals on one side, a positioning pin (18) is slidably provided on the slide seat (16), and the slide seat (16) is limited on the slide rail (15) by the plug-in fit of the positioning pin (18) and the positioning hole (17); One end of the rear limit rope (6) is fixedly connected to the slide seat (16) on the upper arm fixing plate (1), and the other end is fixedly connected to the rear end of the rear extension plate (4).

7. The auxiliary device for preventing joint contracture according to claim 1, characterized in that: The front limiting rope (5) or the rear limiting rope (6) is a rope or an elastic belt.

8. The auxiliary device for preventing joint contracture according to claim 1, characterized in that: The auxiliary device also includes an auxiliary telescopic rod (19), the two ends of which are respectively hinged on the upper arm fixing plate (1) and the rear extension plate (4).

9. The auxiliary device for preventing joint contracture according to claim 1, characterized in that: The auxiliary telescopic rod (19) is a telescopic electric cylinder, and the angle sensor is electrically connected to the auxiliary telescopic rod (19) and the alarm via a controller.

10. The auxiliary device for preventing joint contracture according to claim 1, characterized in that: The auxiliary device also includes an electromyographic biofeedback therapeutic device (20), The myoelectric feedback biotherapy device (20) comprises: The signal acquisition module is used to collect electromyographic signals through electrodes and convert the electrical signals generated by human muscle activity into processable electrical signals; The signal processing module is used to amplify and filter the electromyographic signal collected by the signal collection module; A digital-to-analog conversion module is used to convert the analog signal processed by the signal processing module into a digital signal; The main control module is electrically connected to the digital-to-analog conversion module, and is used to form an elbow joint rehabilitation exercise treatment plan based on the input setting parameters, the collected electromyographic signals, and the built-in evaluation algorithm; and to determine the degree of elbow joint flexion based on the set elbow joint range of motion and the feedback electromyographic signals; The electrical stimulation output module is provided with an electrode sheet and is electrically connected to the main control module, and is used to output a muscle electrical stimulation signal according to the treatment plan formed by the main control module, and adjust the intensity and frequency of the muscle electrical stimulation signal, so as to perform electrical stimulation treatment on the muscles at the elbow joint; The electrical stimulation feedback module is electrically connected to the main control module through the signal processing module and the digital-to-analog conversion module in sequence, and is used to collect feedback information and feed it back to the main control module; A display module, electrically connected to the main control module, for displaying treatment parameters and feedback information; The human-computer interaction module is electrically connected to the main control module and is used to input and adjust parameters; An alarm module is electrically connected to the main control module and is used to issue an alarm when the main control module determines that the degree of elbow flexion exceeds a set range of elbow joint movement; A storage module, electrically connected to the main control module, and used for storing treatment data and electromyographic signals; A power module, used for providing power; Preferably, the main control module is electrically connected to the angle sensor and the auxiliary telescopic rod (19).

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