Ankle movement device for preventing lower limb venous thrombosis

Abstract

The present application relates to the technical field of medical devices, and discloses a foot and ankle stretching and bending exercise device for preventing lower limb venous thrombosis, which comprises a placing base plate capable of being placed on a plane, a driving foot and ankle stretching and bending mechanism, and a controllable damping strength adjusting mechanism, and the structure comprises a driven friction plate capable of generating friction resistance on the driving friction plate, a spiral spring capable of generating elastic force on the driving friction plate and the driven friction plate, and an external thread rod capable of changing the elastic strength of the spiral spring during rotation. The foot and ankle stretching and bending exercise device for preventing lower limb venous thrombosis can play a driving exercise effect in the early stage of exercise, so as to ensure that the patient can perform foot and ankle stretching and bending exercise under the action of external force. In addition, the device can play a damping exercise effect in the later stage of exercise, so as to ensure that the patient can perform foot and ankle stretching and bending exercise by himself / herself, and then realize different degrees of exercise effect on the foot and ankle according to the actual situation, so as to improve the exercise range of the device.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a foot and ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis. Background Technology

[0002] Lower extremity deep vein thrombosis is mainly prevented through foot and ankle flexion and extension exercises. However, some patients do not have enough leg strength, mainly due to leg diseases, making it difficult for them to complete the movements on their own. Relying on medical staff to do it is too time-consuming and energy-intensive for medical staff.

[0003] To this end, Chinese patent publication number "CN221888661U" discloses a "Foot and Ankle Flexion and Extension Exercise Device for the Prevention of Lower Limb Venous Thrombosis". Its main structure includes a lower limb leg seat, and arc-shaped storage grooves are provided on the top of the lower limb leg seat near both sides. A leg fixing structure component is provided between the opposite sides of each arc-shaped storage groove. A foot and ankle flexion and extension component is provided on the top of each leg fixing structure component. This foot and ankle flexion and extension exercise device for the prevention of lower limb venous thrombosis can drive the T-shaped movable block and the foot stop connected to the second hinge seat to move by using an electric telescopic rod. The foot stop is fixed by the first hinge seat and the movable plate. This can assist the foot fixed to the leg support plate and the foot stop to perform foot and ankle flexion and extension movements. This can assist the patient to complete the movement and assist the patient's leg to exert force. It can ensure that the patient can complete the movement by himself as much as possible, replacing the nursing exercise of medical staff and saving medical staff time and energy.

[0004] However, the foot plate in the aforementioned foot and ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis is driven by an electric telescopic rod when rotating around the leg support plate. This means that patients can only perform foot and ankle flexion and extension movements by relying on external force. For patients in the later stages, the effect of foot and ankle flexion and extension movements is more about producing a damping effect, thus achieving a damped exercise effect. However, the aforementioned foot and ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis cannot provide a damped exercise effect at all, resulting in a relatively limited exercise effect. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a foot and ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis. In the initial stage of exercise, it provides a driving exercise effect, ensuring that the patient can perform foot and ankle flexion and extension movements under external force. Furthermore, in the later stage of exercise, the device provides a damping exercise effect, ensuring that the patient can perform foot and ankle flexion and extension movements independently. This allows for different levels of exercise on the foot and ankle based on the actual situation, thereby increasing the device's range of motion and solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a foot and ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis, comprising a placement base plate that can be placed on a flat surface, a drive-type foot and ankle flexion and extension mechanism, the structure of which includes a shoe body that can be worn on the patient's foot, a pivot shaft that can limit the rotation of the shoe body around the heel, a servo motor that can drive the shoe body to rotate in a controllable range of angles and bidirectionally, and a drive friction plate that can rotate with the shoe body; and a controllable damping strength adjustment mechanism, the structure of which includes a driven friction plate that can generate frictional resistance to the drive friction plate, a helical spring that can generate elastic force on the drive friction plate and the driven friction plate, and an externally threaded rod that can change the elastic strength of the helical spring during rotation.

[0007] Preferably, the driven ankle extension and flexion mechanism further includes a shaft driven disk mounted on the bottom surface of the heel of the shoe. The two rotating end faces of the shaft driven disk are respectively provided with a shaft pivot integrated therewith. The shaft of each shaft pivot is mounted in the base hole of a shaft mounting base through a bearing. The two ends of the shaft pivot are respectively fitted with a coupling and a drive friction plate. The servo motor is fixedly mounted at a horizontal angle in the base hole of a motor mounting base. The rotor of the servo motor is fixedly connected to the coupling. The shaft mounting base and the motor mounting base are fixedly mounted on the upper surface of the placement base plate.

[0008] Preferably, the servo motor has the functions of forward rotation and reverse rotation, and its single rotation range is controllable.

[0009] Preferably, the axis of the driven disc and the axis of the rotating shaft are on the same horizontal line, and this horizontal line is balanced with the rotation axis of the patient's ankle.

[0010] Preferably, the controllable damping strength adjustment mechanism further includes a cylindrical hollow shell. The shell of the cylindrical hollow shell is fixedly installed on the upper surface of the substrate by a shell mounting base. The interior of the cylindrical hollow shell is provided with a horizontal component movable cavity. One end of the cylindrical hollow shell is provided with an internal threaded hole connecting one end of the horizontal component movable cavity to the external space. The other end of the cylindrical hollow shell is provided with a rod through hole connecting the other end of the horizontal component movable cavity to the external space. A first built-in movable plate and a second built-in movable plate capable of moving along its axial direction are placed inside the horizontal component movable cavity. A helical spring in a compressed state is placed between the first built-in movable plate and the second built-in movable plate. An external threaded rod passing through the internal threaded hole is fixedly installed at one end of the first built-in movable plate. The rod body of the external threaded rod is installed inside the internal threaded hole through a threaded structure. A knob cap is installed on the outer end face of the external threaded rod. An axial telescopic rod passing through the rod through hole is fixedly installed at one end of the second built-in movable plate. One end of the second built-in movable plate abuts against the end of the driving friction plate.

[0011] Preferably, the thread structure includes an internal thread structure disposed on the inner wall of the internal thread hole and an external thread structure disposed on the external thread rod body, and the internal thread structure and the external thread structure are adapted to each other.

[0012] Preferably, the structural shape of the perforated cross section of the rod is consistent with the structural shape of the cross section of the axial telescopic rod, both being polygonal structures, and the structural dimensions of the perforated cross section of the rod are adapted to the structural dimensions of the cross section of the axial telescopic rod.

[0013] Preferably, when the driving friction plate and the driven friction plate are in contact with each other, the second built-in movable plate is located inside the middle section of the movable cavity of the horizontal component.

[0014] Compared with the prior art, the present invention provides a foot and ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis, which has the following beneficial effects: In the early stages of training, the device provides a driving exercise effect, ensuring that patients can perform ankle flexion and extension movements under external force. In the later stages of training, the device provides a damping exercise effect, ensuring that patients can perform ankle flexion and extension movements on their own. This allows for different levels of training effects on the ankle based on the actual situation, thereby increasing the range of motion of the device. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a perspective view of the driven ankle flexion and extension mechanism in this invention; Figure 4This is a three-dimensional cross-sectional view of the driven ankle extension and flexion mechanism in this invention; Figure 5 This is a perspective view of the controllable damping strength adjustment mechanism in this invention; Figure 6 This is a three-dimensional cross-sectional view of the controllable damping strength adjustment mechanism in this invention.

[0016] The components include: 1. Driven ankle flexion and extension mechanism; 11. Shoe body; 12. Shaft driven disc; 13. Shaft pivot; 14. Shaft mounting base; 15. Coupling; 16. Servo motor; 17. Motor mounting base; 18. Drive friction plate; 2. Controllable damping strength adjustment mechanism; 21. Cylindrical hollow shell; 22. Shell mounting base; 23. Horizontal component movable cavity; 24. Internal threaded hole; 25. Rod through hole; 26. No. 1 built-in movable plate; 27. No. 2 built-in movable plate; 28. Helical spring; 29. ​​External threaded rod; 210. Axial telescopic rod; 211. Knob cap; 212. Driven friction plate; 3. Placement base plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 and Figure 2 An ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis includes a placement base plate 3 that can be placed on a flat surface. The patient can sit on a chair and insert their foot into the shoe body 11 to complete the preparation work before use.

[0019] To perform driven ankle flexion and extension exercises for the patient's ankle, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 3 and Figure 4A driven ankle flexion-extension mechanism 1 needs to be set up. Its structure includes a shoe body 11 that can be worn on the patient's foot, a central pivot 13 that can limit the rotation of the shoe body 11 around the heel, a servo motor 16 that can drive the shoe body 11 to rotate in a controllable range of angles and in both directions, and a driving friction plate 18 that can rotate with the shoe body 11. In the early stage of exercise, the control system that can control the servo motor 16 enables the servo motor 16 to generate forward and reverse rotation and a rated rotation angle. When the servo motor 16 is started, the rotor will drive the central pivot 13 and the shoe body 11 to rotate. The shoe body 11 will then generate a rated rotation angle at the heel, and the shoe body 11 will drive the patient's ankle to perform driven ankle flexion-extension exercises to cope with the traction and coordination exercises of more severe patients in the early stage of exercise.

[0020] For the specific structure of the driven ankle flexion-extension mechanism 1, please refer to [link / reference]. Figure 3 and Figure 4 It also includes a driven disk 12 of the shaft body installed on the bottom surface of the heel of the shoe body 11. The two rotating end faces of the driven disk 12 are respectively provided with a central rotating shaft 13 integrally formed with it. The shaft of each central rotating shaft 13 is mounted in the base hole of a shaft mounting base 14 through a bearing. The two ends of the central rotating shaft 13 are respectively fitted with a coupling 15 and a drive friction plate 18. The servo motor 16 is fixedly installed in the base hole of a motor mounting base 17 at a horizontal angle. The rotor of the servo motor 16 is fixedly connected to the coupling 15. The shaft mounting base 14 and the motor mounting base 17 are fixedly installed on the upper surface of the placement base plate 3. The servo motor 16 has the function of forward rotation and reverse rotation, and its single rotation range is controllable. The axis of the driven disk 12 and the axis of the central rotating shaft 13 are on the same horizontal line, and this horizontal line is balanced with the rotation axis of the patient's ankle.

[0021] To perform damped ankle flexion and extension exercises on the patient's ankle, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 5 and Figure 6A controllable damping strength adjustment mechanism 2 needs to be set up. Its structure includes a driven friction plate 212 that can generate frictional resistance to the driving friction plate 18, a helical spring 28 that can generate elastic force to the driving friction plate 18 and the driven friction plate 212, and an external threaded rod 29 that can change the elastic strength of the helical spring 28 when rotating. When the patient's ankle recovers to a certain extent, there is no need to start the servo motor 16. The patient can use the mobility of the ankle to perform ankle flexion and extension movements independently. During the exercise, when the shoe body 11 rotates, it must overcome the driving friction plate 18 and the driven friction plate 212. The friction between plates 212, and the friction between the driving friction plate 18 and the driven friction plate 212 comes from the elastic strength of the coil spring 28. Therefore, the patient can rotate the knob cap 211. Due to the threaded connection, the external thread rod 29 will drive the first built-in movable plate 26 to move axially. At this time, the distance between the first built-in movable plate 26 and the second built-in movable plate 27 will change, and the elastic force of the coil spring 28 on the second built-in movable plate 27 will change, thereby changing the friction between the driving friction plate 18 and the driven friction plate 212, thus making it controllable.

[0022] For details regarding the specific structure of the controllable damping strength adjustment mechanism 2, please refer to [link / reference]. Figure 5 and Figure 6It also includes a cylindrical hollow shell 21, the shell of which is fixedly mounted on the upper surface of the substrate 3 via a shell mounting base. The cylindrical hollow shell 21 has a horizontal component movable cavity 23 inside. One end of the cylindrical hollow shell 21 has an internal threaded hole 24 connecting one end of the horizontal component movable cavity 23 to the external space, and the other end of the cylindrical hollow shell 21 has a rod through hole 25 connecting the other end of the horizontal component movable cavity 23 to the external space. Inside the horizontal component movable cavity 23 are a first built-in movable plate 26 and a second built-in movable plate 27 capable of moving along its axial direction. A compressed helical spring 28 is placed between the first built-in movable plate 26 and the second built-in movable plate 27. One end of the first built-in movable plate 26 is fixedly mounted with an external threaded rod 29 that passes through the internal threaded hole 24. The rod of the external threaded rod 29 is mounted to the internal threaded hole 24 via a threaded structure. Inside the threaded hole 24, a knob cap 211 is installed on the outer end face of the external threaded rod 29. One end of the second built-in movable plate 27 is fixedly installed with an axial telescopic rod 210 that passes through the rod body through hole 25. One end of the second built-in movable plate 27 abuts against the end of the driving friction plate 18. The threaded structure includes an internal thread structure set on the inner circumference of the internal threaded hole 24 and an external thread structure set on the rod body of the external threaded rod 29. The internal thread structure is adapted to the external thread structure. The cross-sectional shape of the rod body through hole 25 is consistent with the cross-sectional shape of the axial telescopic rod 210, both being polygonal structures. The cross-sectional dimensions of the rod body through hole 25 are adapted to the cross-sectional dimensions of the axial telescopic rod 210. When the driving friction plate 18 and the driven friction plate 212 abut against each other, the second built-in movable plate 27 is located inside the middle section of the horizontal component movable cavity 23.

[0023] In use, the placement base plate 3 is placed on the ground or a flat surface. The patient sits on a chair and inserts their foot into the shoe body 11. The control system, which controls the servo motor 16, enables the servo motor 16 to rotate in both forward and reverse directions at a predetermined angle. Activating the servo motor 16 causes the rotor to drive the shaft 13 and the shoe body 11 to rotate. The shoe body 11 then rotates at a predetermined angle at the heel, driving the patient's ankle to perform flexion and extension exercises. Once the patient's ankle has recovered to a certain extent, the servo motor 16 no longer needs to be activated; the patient can then independently perform ankle extension exercises using their ankle mobility. During the flexion exercise, when the shoe body 11 rotates, it must overcome the friction between the driving friction plate 18 and the driven friction plate 212. The friction between the driving friction plate 18 and the driven friction plate 212 comes from the elastic strength of the coil spring 28. Therefore, the patient can rotate the knob cap 211. Due to the threaded connection, the external thread rod 29 will drive the first internal movable plate 26 to move axially. At this time, the distance between the first internal movable plate 26 and the second internal movable plate 27 will change, and the elastic force of the coil spring 28 on the second internal movable plate 27 will change, thereby changing the friction between the driving friction plate 18 and the driven friction plate 212.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foot and ankle flexion and extension exercise device for the prevention of lower extremity deep vein thrombosis, comprising a placement base plate (3) capable of being placed on a flat surface, characterized in that: include, The driven ankle extension and flexion mechanism (1) includes a shoe body (11) that can be worn on the patient's foot, a pivot shaft (13) that can limit the shoe body (11) to rotate around the heel, a servo motor (16) that can drive the limited shoe body (11) to rotate in a controllable range of angles and in both directions, and a drive friction plate (18) that can rotate with the limited shoe body (11). And a controllable damping strength adjustment mechanism (2), the structure of which includes a driven friction plate (212) that can generate frictional resistance to the driving friction plate (18), a helical spring (28) that can generate elastic force to the driving friction plate (18) and the driven friction plate (212), and an external thread rod (29) that can change the elastic strength of the helical spring (28) when rotating.

2. The foot and ankle flexion / extension exercise device for the prevention of lower extremity venous thrombosis according to claim 1, characterized in that: The driven ankle extension and flexion mechanism (1) further includes a shaft driven disk (12) installed on the bottom surface of the heel of the shoe body (11). The two rotating end faces of the shaft driven disk (12) are respectively provided with a shaft pivot (13) integral with it. The shaft of each shaft pivot (13) is installed in the base hole of a shaft mounting base (14) by bearing. The two ends of the shaft pivot (13) are respectively fitted with a coupling (15) and a driving friction plate (18). The servo motor (16) is fixedly installed in the base hole of a motor mounting base (17) at a horizontal angle. The rotor of the servo motor (16) and the coupling (15) are fixedly connected. The shaft mounting base (14) and the motor mounting base (17) are fixedly installed on the upper surface of the placement base plate (3).

3. The foot and ankle flexion / extension exercise device for the prevention of lower extremity venous thrombosis according to claim 2, characterized in that: The servo motor (16) has the functions of forward rotation and reverse rotation, and its single rotation range is controllable.

4. The foot and ankle flexion / extension exercise device for the prevention of lower extremity venous thrombosis according to claim 3, characterized in that: The axis of the driven disc (12) and the axis of the rotating shaft (13) are on the same horizontal line, and the horizontal line is in balance with the rotation axis of the patient's ankle.

5. The foot and ankle flexion / extension exercise device for the prevention of lower extremity venous thrombosis according to claim 4, characterized in that: The controllable damping strength adjustment mechanism (2) further includes a cylindrical hollow shell (21). The shell of the cylindrical hollow shell (21) is fixedly installed on the upper surface of the placement base plate (3) through a shell mounting base. The cylindrical hollow shell (21) has a horizontal component movable cavity (23) inside. One end of the cylindrical hollow shell (21) is provided with an internal threaded hole (24) connecting one end of the horizontal component movable cavity (23) to the external space. The other end of the cylindrical hollow shell (21) is provided with a rod through hole (25) connecting the other end of the horizontal component movable cavity (23) to the external space. The horizontal component movable cavity (23) contains a first built-in movable plate (26) that can move along its axial direction. A coil spring (28) in a compressed state is placed between the first built-in movable plate (26) and the second built-in movable plate (27). An external thread rod (29) that passes through the internal thread hole (24) is fixedly installed at one end of the first built-in movable plate (26). The rod body of the external thread rod (29) is installed inside the internal thread hole (24) through a threaded structure. A knob cap (211) is installed on the outer end face of the external thread rod (29). An axial telescopic rod (210) that passes through the rod body through hole (25) is fixedly installed at one end of the second built-in movable plate (27). One end of the second built-in movable plate (27) abuts against the end of the driving friction plate (18).

6. The foot and ankle flexion / extension exercise device for the prevention of lower extremity venous thrombosis according to claim 5, characterized in that: The threaded structure includes an internal threaded structure located on the inner wall of the internal threaded hole (24) and an external threaded structure located on the body of the external threaded rod (29), and the internal threaded structure is adapted to the external threaded structure.

7. The foot and ankle flexion / extension exercise device for the prevention of lower extremity deep vein thrombosis according to claim 6, characterized in that: The cross-sectional shape of the rod through hole (25) is consistent with the cross-sectional shape of the axial telescopic rod (210), both being polygonal structures, and the structural dimensions of the cross-sectional shape of the rod through hole (25) are adapted to the structural dimensions of the cross-sectional shape of the axial telescopic rod (210).

8. The foot and ankle flexion / extension exercise device for the prevention of lower extremity deep vein thrombosis according to claim 7, characterized in that: When the driving friction plate (18) and the driven friction plate (212) abut against each other, the second built-in movable plate (27) is located inside the middle section of the horizontal component movable cavity (23).

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