Total knee arthroplasty lower limb fixing device capable of being adjusted by bending knees

Abstract

The invention discloses a total knee arthroplasty lower limb fixing device capable of being adjusted in a knee bending mode, and relates to the field of medical auxiliary instruments, the total knee arthroplasty lower limb fixing device comprises a base and a supporting plate, the supporting plate is arranged above the base to support limbs, a vertical plate is fixed to the left end of the supporting plate, and a pedal is arranged on the right side of the vertical plate; the pedal plate is attached to the feet of a patient, limiting blocks are arranged above the supporting plate, the limiting blocks are symmetrically arranged front and back relative to the center of the supporting plate and provide a limiting effect for the legs of the patient, and automatic control mechanisms are arranged on the outer sides of the limiting blocks and automatically control the positions of the limiting blocks. According to the total knee replacement operation lower limb fixing device capable of being adjusted in a knee bending mode, the supporting plate is used for supporting the feet of a patient, the supporting plate can horizontally move and automatically rotate while moving, and therefore the supporting plate can adapt to the change of the feet when the patient bends the knee, the knee bending angle of the patient can be adjusted while the fixing effect is provided for the patient, and the patient can conveniently and rapidly bend the knee. And a corresponding operation can be conveniently carried out.

Description

Technical Field

[0001] The invention relates to the technical field of medical auxiliary equipment, and in particular to a lower limb fixation device for total knee replacement surgery with adjustable knee flexion. Background Art

[0002] The knee joint is an important active joint of the lower limbs. The most fundamental treatment method after damage is to remove and replace the knee joint through total knee replacement surgery to relieve joint pain and improve joint function. During knee replacement surgery, the limb needs to be fixed to ensure the stability of the operation.

[0003] Prior art 1 (publication number CN214762043U, Chinese patent published on November 19, 2021) A limb fixation device for knee replacement surgery, including a foot support and a base plate, a row of oblique holes are provided on the upper surface of the base plate, and the angles between the row of oblique holes and the horizontal forward direction increase from back to front, and each oblique hole and the horizontal forward direction are obtuse angles; in summary, this scheme changes the position of the foot support at different oblique holes to meet the adjustment of the angle of flexion or extension of the knee joint during the operation. Compared with the complex mechanical structure in the comparative document, the utility model has a simple structure, which can meet the flexion and extension angles of the knee joint while facilitating overall disinfection and sterilization; Prior art 2 (publication number CN113229956A, 202 A Chinese patent (published on August 10, 2011) is a lower limb fixation device for orthopedic knee replacement surgery, comprising a base plate, a leg support device, a lifting device, a fixing device and a foot support device, the base plate is horizontally arranged, two leg support devices are arranged, and the two leg support devices are symmetrically arranged on the base plate, the lifting device is arranged at the bottom of the base plate and connected to the leg support device, the fixing device is arranged on the base plate and connected to one end of the leg support device, and the foot support device is arranged on the base plate and connected to the other end of the leg support device. In the knee replacement surgery, the patient's legs are placed on the base plate, and the patient's legs are fixed by the fixing device. During the operation, the patient's legs can be bent and lifted up by the lifting device, which is convenient for medical staff to perform surgery on them.

[0004] Although the current lower limb fixation devices can achieve the fixation effect on the lower limbs, their flexibility and adjustability are poor. After supporting the limbs, if the knee needs to be flexed to adjust the joint position, the patient's limbs need to be controlled to be rearranged and adjusted, which is inconvenient to operate and can easily cause harm to the patient during the operation. In addition, the support angle of the joint is generally in a vertical state and cannot be adjusted laterally, and the flexibility is low. Summary of the invention

[0005] The purpose of the present invention is to provide a lower limb fixation device for total knee replacement surgery with adjustable knee flexion, so as to solve the problem raised in the above-mentioned background technology that after the limb is supported, if the knee needs to be flexed to adjust the joint position, it is also necessary to control the patient's limb to be rearranged and adjusted, which is inconvenient to operate and may easily cause harm to the patient during the operation. In addition, the support angle of the joint is generally in a vertical state and cannot be adjusted laterally.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lower limb fixation device for total knee replacement surgery with adjustable knee flexion, comprising a base and a support plate, wherein the support plate is arranged above the base to provide support for the limb, a vertical plate is fixed to the left end of the support plate, and a foot pedal is arranged on the right side of the vertical plate, the foot pedal fits the patient's foot, a limiting block is arranged above the support plate, and the limiting blocks are symmetrically arranged front and back about the center of the support plate to provide a limiting effect for the patient's leg, and an automatic control mechanism is arranged on the outer side of the limiting block to automatically control the position of the limiting block, and a support mechanism is arranged below the support plate. A support seat is provided, and a rotating shaft is rotatably installed on the inner side of the support seat, and the rotating shaft is connected to the support plate, and the rotating shaft is located at the front and rear sides of the support plate, so that the support plate can rotate to adapt to knee bending and adjust the direction of the foot. A movable block is provided at the bottom of the support seat, and a movable adjustment mechanism is provided on the inner side of the base to provide horizontal movement control for the movable block to control the movement of the movable block. The upper part of the movable block is designed with an arc-shaped structure, and a movable ring is rotatably installed inside the movable block, and the movable ring is fixedly connected to the lower end of the support seat, and a rotation control mechanism is provided on the inner side of the movable ring to control the movable ring to drive the support seat to move.

[0007] To further optimize the technical solution, the automatic control mechanism includes a driving block, a first spring, a control rope and a winding mechanism; The driving block is fixed below the limiting block, and a front-to-back sliding structure is formed between the driving block and the supporting plate; A first spring, fixed on the inner side of the driving block, provides a thrust for the driving block to move outward; A control rope, fixed on the inner side of the driving block to control the movement of the driving block; The reeling mechanism is connected to the control rope to control the reeling and releasing of the control rope.

[0008] To further optimize the technical solution, the winding mechanism includes a control shaft, a connecting plate and a control gear; A control shaft is rotatably mounted on the left side of the support plate, and the left end of the control rope is wound around the surface of the control shaft; The connecting plate is fixed on the left side of the footrest, and a left-right sliding structure is formed between the connecting plate and the vertical plate; The control gear is fixed on the surface of the control shaft, and the control gear is located between the side of the connecting plate and the connecting plate to form a meshing connection.

[0009] To further optimize the technical solution, the movable adjustment mechanism includes a threaded rod, which passes through the movable block and forms a threaded connection between the movable blocks. The threaded rod is rotatably installed on the inner side of the base, and a left-right sliding structure is formed between the movable block and the base.

[0010] To further optimize the technical solution, the rotation control mechanism includes a transmission gear, a mounting shaft and a fixing block; A transmission gear is arranged on the inner side of the movable ring, and a rotation connection is formed between the transmission gear and the movable block; The installation shaft penetrates the transmission gear and the movable block and the transmission gear to form a left-right sliding structure, and the installation shaft and the base form a rotation connection; The fixed block is fixed on the inner side of the transmission gear, and the transmission gear keeps synchronous rotation through the fixed block and the mounting shaft.

[0011] To further optimize the technical solution, a manual control mechanism is provided at the right end of the installation shaft and the right end of the threaded rod to control the rotation of the installation shaft and the threaded rod.

[0012] To further optimize the technical solution, the manual control mechanism includes a transmission shaft, a first bevel gear, a second bevel gear, a movable shaft and a transmission locking mechanism; A transmission shaft is fixed to the transmission shaft and the right end of the threaded rod respectively; A first bevel gear is fixed to the right end of the transmission shaft; A second bevel gear is arranged at the front side of the first bevel gear, and the second bevel gear and the first bevel gear are meshedly connected; A movable shaft is fixed on the front side of the second bevel gear, and a rotation connection is formed between the movable shaft and the base; The transmission locking mechanism is arranged on the front side of the movable shaft to control the rotation and locking of the movable shaft.

[0013] To further optimize the technical solution, the transmission locking mechanism includes an operating shaft, a locking block, a locking slot, a release slot and a telescopic connection mechanism; An operating shaft is arranged at the front side of the movable shaft, and a front-to-back sliding structure is formed between the operating shaft and the base; A locking block, fixed to the surface of the operating shaft; A locking groove is arranged on the outer side of the locking block and between the locking blocks to form a snap-fit ​​structure; The release groove is arranged at the rear side of the locking groove, and the release groove is designed in an annular structure; The telescopic connection mechanism is arranged between the operating shaft and the movable shaft to connect them.

[0014] To further optimize the technical solution, the locking grooves are distributed at equal angles with the center of the operating shaft as the center, and the locking grooves and the releasing grooves are arranged to be interconnected.

[0015] To further optimize the technical solution, the telescopic connection mechanism includes a transmission block and a second spring; The transmission block is fixed at the rear end of the operating shaft, and the rear end of the transmission block is located inside the movable shaft and forms a nested connection between the movable shaft; The second spring is fixed to the rear end of the transmission block to provide a forward thrust for the transmission block.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The support plate provides support for the patient's feet, and the support plate can move horizontally and automatically rotate while moving, so as to adapt to the changes in the patient's feet when the patient flexes the knee. It can provide a fixation effect for the patient while also adjusting the patient's knee flexion angle, making it easier to perform the corresponding surgery.

[0017] (2) The limiting block provides a limiting effect on the patient's feet, allowing them to maintain synchronous and stable movement with the support plate, thereby ensuring its fixation effect.

[0018] (3) The limit block can be controlled to move by the foot pedal. After the foot contacts the foot pedal, the foot pedal can be moved by controlling the movement of the support plate to control the limit block to perform the limit operation. The foot pedal is always under pressure during knee flexion adjustment to maintain the limit effect. After the limb is laid flat, the pressure on the foot pedal is released to automatically release the limit. It is flexible and convenient to use.

[0019] (4) The support seat can be controlled by rotating the movable ring to drive the support plate to rotate and move, thereby driving the patient's lower limbs to move, and the legs can be placed sideways to adjust the leakage position at the joint, thereby facilitating surgical operations and increasing the flexibility and functionality of the device.

[0020] (5) The knee flexion adjustment can be controlled by rotating the operating shaft, and the control is done by pressing the operating shaft to rotate. After the adjustment is completed, the operating shaft also has a self-locking function to maintain the stability of the device in its supporting position, thereby improving the ease of use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the top view structure of the present invention; Figure 3 It is a schematic diagram of the side section structure of the present invention; Figure 4 It is a schematic diagram of the side section structure of the support plate of the present invention; Figure 5 This is a schematic diagram of the top-sectional structure of the support plate of the present invention; Figure 6 It is a schematic diagram of the vertical plate cross-section structure of the present invention; Figure 7 It is a schematic diagram of the side section structure of the movable block of the present invention; Figure 8 It is a schematic diagram of the main cross-sectional structure of the present invention; Fig. 9 This is a schematic diagram of the side view of the operating shaft of the present invention; Fig.10 It is a rear structural schematic diagram of the locking block of the present invention.

[0022] In the figure: 1, base; 2, movable block; 3, support plate; 4, vertical plate; 5, foot pedal; 6, limit block; 7, drive block; 8, first spring; 9, control rope; 10, control shaft; 11, connecting plate; 12, control gear; 13, support seat; 1301, rotating shaft; 14, movable ring; 15, transmission gear; 16, mounting shaft; 17, fixed block; 18, threaded rod; 19, transmission shaft; 20, first bevel gear; 21, second bevel gear; 22, movable shaft; 23, operating shaft; 24, transmission block; 25, second spring; 26, locking block; 27, locking groove; 28, release groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 10 , the present invention provides the following technical solutions: a lower limb fixation device for total knee replacement surgery with adjustable knee flexion, comprising a base 1 and a support plate 3, wherein the support plate 3 is arranged above the base 1 to provide support for the limb; Embodiment 1: The present invention provides the following technical solution, which discloses that a vertical plate 4 is fixed to the left end of the support plate 3, and a foot pedal 5 is arranged on the right side of the vertical plate 4, and the foot pedal 5 fits the patient's foot, a limiting block 6 is arranged above the support plate 3, and the limiting block 6 is symmetrically arranged front and back about the center of the support plate 3 to provide a limiting effect for the patient's legs, and an automatic control mechanism is arranged on the outer side of the limiting block 6 to automatically control the position of the limiting block 6, a support seat 13 is arranged below the support plate 3, and a rotating shaft 1301 is rotatably installed on the inner side of the supporting seat 13, and the rotating shaft 1301 and the support plate 3 are connected, and the rotating shaft 1301 is located at the front and rear sides of the support plate 3, so that the support plate 3 can rotate to adapt to the knee bending to adjust the direction of the foot. A movable block 2 is arranged below the support seat 13, and a movable adjustment mechanism is arranged on the inner side of the base 1 to provide horizontal movement control for the movable block 2 to control the movement of the movable block 2. The upper part of the movable block 2 is designed in an arc-shaped structure, and a movable ring 14 is rotatably installed inside the movable block 2, and the movable ring 14 is fixedly connected to the lower end of the support seat 13, and a rotation control mechanism is arranged on the inner side of the movable ring 14 to control the movable ring 14 to drive the support seat 13 to move.

[0025] When in use, the base 1 can be placed on the support surface, and the patient's feet can be placed above the support plate 3 so that they are opposite to the foot pedal 5. The patient's legs can then be limited by the limit block 6 to maintain a stable connection between them and the support plate 3. When knee flexion adjustment is needed later, the support plate 3 can be driven to move by controlling the movement of the movable block 2 in the base 1 to adjust the bending of the patient's lower limbs. When the support plate 3 moves horizontally to drive the limbs to flex the knees, the support plate 3 will rotate on the inner side of the support seat 13 through the movable rotating shaft 1301, so that it can adapt to the placement direction of the patient's feet after the knees are flexed. When the direction of knee flexion needs to be adjusted, the support seat 13 and the support plate 3 can be driven to rotate laterally by controlling the rotation of the movable ring 14 to drive the limbs to move. The direction of knee flexion can be adjusted to facilitate different surgical operations or observations.

[0026] Embodiment 2: On the basis of embodiment 1, an automatic control mechanism is disclosed, including a driving block 7, a first spring 8, a control rope 9 and a winding mechanism. The driving block 7 is fixed below the limit block 6, and a front-rear sliding structure is formed between the driving block 7 and the support plate 3. The first spring 8 is fixed on the inner side of the driving block 7 to provide a thrust for the driving block 7 to move outward. The control rope 9 is fixed on the inner side of the driving block 7 to control the movement of the driving block 7. The winding mechanism is connected to the control rope 9 to control the retraction and release of the control rope 9. The winding mechanism includes a control shaft 10, a connecting plate 11 and a control gear 12. The control shaft 10 is rotatably mounted on the left side of the support plate 3. The left end of the control rope 9 is wound around the surface of the control shaft 10. The connecting plate 11 is fixed on the left side of the foot pedal 5, and a left-right sliding structure is formed between the connecting plate 11 and the vertical plate 4. The control gear 12 is fixed on the surface of the control shaft 10, and the control gear 12 is located between the side of the connecting plate 11 and the connecting plate 11 to form a meshing connection.

[0027] After placing the patient's foot to the right side of the foot pedal 5, the movable block 2 can be controlled to drive the support plate 3 to move, so that the patient's foot presses the foot pedal 5, and the foot pedal 5 drives the connecting plate 11 to move, so that the connecting plate 11 drives the control shaft 10 to rotate through the engagement with the control gear 12, and the control shaft 10 reels the control rope 9, so that the control rope 9 pulls the driving block 7 to drive the limit block 6 to move, and the limit block 6 clamps and fixes the patient's leg. Subsequently, during the knee flexion adjustment, the foot pedal 5 is always under pressure, and the fixing effect of the limit block 6 can be maintained. When the fixation needs to be released, the movable block 2 is controlled to move to the left to release the pressure on the foot pedal 5.

[0028] Embodiment 3: On the basis of embodiment 1, a movable adjustment mechanism is disclosed, which includes a threaded rod 18, the threaded rod 18 passes through the movable block 2 and the movable block 2 forms a threaded connection, the threaded rod 18 is rotatably installed on the inner side of the base 1, and the movable block 2 and the base 1 form a left-right sliding structure, and the rotation control mechanism includes a transmission gear 15, a mounting shaft 16 and a fixed block 17, the transmission gear 15 is arranged on the inner side of the movable ring 14, and the transmission gear 15 and the movable block 2 form a rotation connection, the mounting shaft 16 passes through the transmission gear 15 and the movable block 2 and the transmission gear 15 form a left-right sliding structure, and the mounting shaft 16 and the base 1 form a rotation The fixed block 17 is fixed on the inner side of the transmission gear 15. The transmission gear 15 keeps synchronous rotation with the fixing block 17 and the mounting shaft 16. The right end of the mounting shaft 16 and the right end of the threaded rod 18 are provided with a manual control mechanism to control the rotation of the mounting shaft 16 and the threaded rod 18. The manual control mechanism includes a transmission shaft 19, a first bevel gear 20, a second bevel gear 21, a movable shaft 22 and a transmission locking mechanism. The transmission shaft 19 is respectively fixed on the right end of the transmission shaft 19 and the threaded rod 18. The first bevel gear 20 is fixed on the right end of the transmission shaft 19. The second bevel gear 21 is arranged on the front side of the first bevel gear 20, and the second bevel gear 21 is arranged on the front side of the first bevel gear 20. The wheel 21 and the first bevel gear 20 are meshed and connected, the movable shaft 22 is fixed on the front side of the second bevel gear 21, and the movable shaft 22 and the base 1 are connected in rotation. The transmission locking mechanism is arranged on the front side of the movable shaft 22 to control the rotation and locking of the movable shaft 22. The transmission locking mechanism includes an operating shaft 23, a locking block 26, a locking groove 27, a release groove 28 and a telescopic connection mechanism. The operating shaft 23 is arranged on the front side of the movable shaft 22, and a front-rear sliding structure is formed between the operating shaft 23 and the base 1. The locking block 26 is fixed on the surface of the operating shaft 23, and the locking groove 27 is arranged on the outer side of the locking block 26 and between the locking block 26 to form a The engaging structure, the release groove 28, is opened on the rear side of the locking groove 27, and the release groove 28 is designed in an annular structure. The telescopic connection mechanism is arranged between the operating shaft 23 and the movable shaft 22 to connect them. The locking groove 27 is distributed at equal angles with the center of the circle of the operating shaft 23 as the center, and the locking groove 27 and the release groove 28 are arranged to be interconnected. The telescopic connection mechanism includes a transmission block 24 and a second spring 25. The transmission block 24 is fixed at the rear end of the operating shaft 23, and the rear end of the transmission block 24 is located inside the movable shaft 22 and between the movable shaft 22 to form a nested connection. The second spring 25 is fixed at the rear end of the transmission block 24 to provide a forward thrust for the transmission block 24.

[0029] The rotation of the threaded rod 18 can drive the movable block 2 to rotate and adjust its position, and when the movable block 2 moves, the transmission gear 15 will slide on the surface of the mounting shaft 16, and the rotation of the mounting shaft 16 drives the transmission gear 15 to rotate, and the transmission gear 15 drives the movable ring 14 to rotate to control the support seat 13 to move. When it is necessary to control the threaded rod 18 or the mounting shaft 16 to rotate, the operating shaft 23 can be pressed to move the locking block 26, release the connection between the locking block 26 and the locking groove 27, move the locking block 26 into the release groove 28, and make the operating shaft 23 rotatable State, at the same time, the transmission block 24 squeezes the second spring 25, and then rotates the operating shaft 23, the operating shaft 23 drives the movable shaft 22 to rotate through the transmission block 24, and the movable shaft 22 drives the transmission shaft 19 to rotate through the engagement between the second bevel gear 21 and the first bevel gear 20, so as to realize the rotation control of the installation shaft 16 or the threaded rod 18, and subsequently releases the operating shaft 23, the second spring 25 will push the transmission block 24 and the operating shaft 23 to move forward, so that the locking block 26 is connected to the locking groove 27 again, and the rotation state of the installation shaft 16 and the threaded rod 18 is locked to maintain the stability of the device.

[0030] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lower limb fixation device for total knee replacement surgery with adjustable knee flexion, comprising a base (1) and a support plate (3), wherein the support plate (3) is arranged above the base (1) to provide support for the limb; Features: A vertical plate (4) is fixed to the left end of the support plate (3), and a foot pedal (5) is arranged on the right side of the vertical plate (4), and the foot pedal (5) is fitted with the patient's foot. A limit block (6) is arranged above the support plate (3), and the limit blocks (6) are symmetrically arranged front and back about the center of the support plate (3) to provide a limit effect for the patient's legs, and an automatic control mechanism is arranged on the outside of the limit block (6) to automatically control the position of the limit block (6). A support seat (13) is arranged below the support plate (3), and a rotating shaft (1301) is rotatably installed on the inner side of the support seat (13), and the rotating shaft (1301) is connected to the support plate (3), and the rotating shaft (1301) is located at the front and rear sides of the support plate (3), so that the support plate (3) can rotate to adapt to the knee bending and adjust the direction of the foot. A movable block (2) is arranged below the support seat (13), and a movable adjustment mechanism is arranged on the inner side of the base (1) to provide horizontal movement control for the movable block (2) to control the movement of the movable block (2). The upper part of the movable block (2) is designed in an arc-shaped structure, and a movable ring (14) is rotatably installed inside the movable block (2), and the movable ring (14) and the lower end of the support seat (13) are fixedly connected. A rotation control mechanism is arranged on the inner side of the movable ring (14) to control the movable ring (14) to drive the support seat (13) to move.

2. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 1, characterized in that: The automatic control mechanism comprises a driving block (7), a first spring (8), a control rope (9) and a winding mechanism; A driving block (7) is fixed below the limiting block (6), and a front-to-rear sliding structure is formed between the driving block (7) and the supporting plate (3); A first spring (8) is fixed to the inner side of the driving block (7) to provide a thrust for the driving block (7) to move outward; A control rope (9) fixed on the inner side of the driving block (7) to control the movement of the driving block (7); The reeling mechanism is connected to the control rope (9) and controls the reeling and unreeling of the control rope (9).

3. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 2, characterized in that: The winding mechanism comprises a control shaft (10), a connecting plate (11) and a control gear (12); A control shaft (10) is rotatably mounted on the left side of the support plate (3), and the left end of the control rope (9) is wound around the surface of the control shaft (10); A connecting plate (11) is fixed to the left side of the footrest (5), and a left-right sliding structure is formed between the connecting plate (11) and the vertical plate (4); The control gear (12) is fixed on the surface of the control shaft (10), and the control gear (12) is located on the side of the connecting plate (11) and is meshed with the connecting plate (11).

4. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 1, characterized in that: The movable adjustment mechanism comprises a threaded rod (18), the threaded rod (18) passing through the movable block (2) and forming a threaded connection between the movable blocks (2), the threaded rod (18) being rotatably mounted on the inner side of the base (1), and a left-right sliding structure being formed between the movable block (2) and the base (1).

5. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 4, characterized in that: The rotation control mechanism comprises a transmission gear (15), a mounting shaft (16) and a fixing block (17); A transmission gear (15) is arranged on the inner side of the movable ring (14), and a rotation connection is formed between the transmission gear (15) and the movable block (2); The mounting shaft (16) passes through the transmission gear (15) and the movable block (2) and the transmission gear (15) to form a left-right sliding structure, and the mounting shaft (16) and the base (1) are rotatably connected; The fixing block (17) is fixed on the inner side of the transmission gear (15), and the transmission gear (15) keeps synchronous rotation through the fixing block (17) and the mounting shaft (16).

6. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 5, characterized in that: The right end of the installation shaft (16) and the right end of the threaded rod (18) are both provided with a manual control mechanism to control the rotation of the installation shaft (16) and the threaded rod (18).

7. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 6, characterized in that: The manual control mechanism comprises a transmission shaft (19), a first bevel gear (20), a second bevel gear (21), a movable shaft (22) and a transmission locking mechanism; A transmission shaft (19) is fixed to the transmission shaft (19) and the right end of the threaded rod (18) respectively; A first bevel gear (20) is fixed to the right end of the transmission shaft (19); A second bevel gear (21) is arranged on the front side of the first bevel gear (20), and the second bevel gear (21) and the first bevel gear (20) are meshedly connected; A movable shaft (22) is fixed on the front side of the second bevel gear (21), and a rotation connection is formed between the movable shaft (22) and the base (1); A transmission locking mechanism is arranged on the front side of the movable shaft (22) to control the rotation and locking of the movable shaft (22).

8. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 7, characterized in that: The transmission locking mechanism comprises an operating shaft (23), a locking block (26), a locking slot (27), a release slot (28) and a telescopic connection mechanism; An operating shaft (23) is arranged on the front side of the movable shaft (22), and a front-to-rear sliding structure is formed between the operating shaft (23) and the base (1); A locking block (26) fixed on the surface of the operating shaft (23); A locking groove (27) is arranged on the outer side of the locking block (26) and between the locking block (26) to form a snap-fit ​​structure; A release groove (28) is provided at the rear side of the locking groove (27), and the release groove (28) is designed in an annular structure; The telescopic connection mechanism is arranged between the operating shaft (23) and the movable shaft (22) to connect them.

9. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 8, characterized in that: The locking grooves (27) are distributed at equal angles with the center of the operating shaft (23) as the center, and the locking grooves (27) and the releasing grooves (28) are arranged to communicate with each other.

10. The lower limb fixation device for total knee replacement surgery with adjustable knee flexion according to claim 9, characterized in that: The telescopic connection mechanism comprises a transmission block (24) and a second spring (25); A transmission block (24) is fixed to the rear end of the operating shaft (23), and the rear end of the transmission block (24) is located inside the movable shaft (22) and forms a nested connection between the movable shaft (22); The second spring (25) is fixed to the rear end of the transmission block (24) to provide a forward thrust for the transmission block (24).

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