Orthopedic postoperative lower limb training device

Abstract

This application belongs to the field of medical devices and relates to a lower limb training device after orthopedic surgery. The lower limb training device includes a base, a slider, a first connecting rod, a second connecting rod, a third connecting rod, a positioning mechanism, and a driving device. The slider is slidably mounted on the base. The lower end of the first connecting rod is hinged to the slider, the side wall of the second connecting rod is hinged to the upper end of the first connecting rod, and one end of the second connecting rod is equipped with an ankle fixation device. One end of the third connecting rod is hinged to the base, and the other end of the third connecting rod is hinged to the second connecting rod. The third connecting rod is equipped with a leg fixation device. The positioning mechanism switches the second and third connecting rods between a coaxial fixed state and a hinged movable state. The driving device can drive the switching between the two states. This lower limb training device can perform straight leg raise and leg bend training with a single unit, reducing hospital procurement costs and reducing the overall space occupied by the device compared to equipping separate straight leg raise and leg bend training devices.

Description

Technical Field

[0001] This application belongs to the field of medical devices and relates to a lower limb training device after orthopedic surgery. Background Technology

[0002] With the continuous development of medical technology, medical professionals are paying more attention to postoperative recovery while focusing on the surgery itself. Many doctors recommend straight leg raises or leg bending exercises after knee, patella, or lumbar spine surgeries to improve rehabilitation outcomes.

[0003] Patent CN209437615U discloses a portable straight leg raise trainer, including a body with a U-shaped groove at the top and a straight groove on one side of the U-shaped groove at the top. A telescopic rod is rotatably connected to one end of a fixed rod, and a strap is attached to the outer side of the upper end of the telescopic rod. A lifting mechanism is installed through the inner side of the U-shaped groove. The lifting mechanism drives the telescopic rod to rise or fall at a certain angle along the fixed rod, thereby achieving the purpose of training the patient's legs.

[0004] However, the aforementioned training device can only provide straight leg raise training. In actual clinical practice, in addition to straight leg raise training, many patients also need leg bending exercises. The aforementioned training device cannot meet multiple needs, and hospitals can only add a separate leg bending training device, which is costly and takes up a lot of space. Utility Model Content

[0005] In order to enable the lower limb trainer to meet the requirements of straight leg raise and bent leg exercises, this application provides a lower limb trainer after orthopedic surgery.

[0006] The technical solution for a lower limb training device after orthopedic surgery provided in this application is as follows: A lower limb training device for post-orthopedic surgery, comprising: Base; A slider, which is slidably disposed on the base along the length direction of the base; Link 1, the lower end of which is hinged to the slider; Link 2, the side wall of link 2 is hinged to the upper end of link 1, and one end of link 2 is provided with an ankle fixation device for fixing the patient's ankle; Link three, one end of which is hinged to the base, and the other end of which is hinged to the end of link two away from the ankle fixation device. Link three is provided with a leg fixation device for fixing the patient's thigh. A positioning mechanism is provided at the hinge between link two and link three, and is used to switch link two and link three between a coaxial fixed state and a hinged movable state. The driving device is fixed on the base and can switch between two states: driving the slider to slide along the base and driving the connecting rod to swing.

[0007] By adopting the above technical solution, when the patient needs to perform straight leg training after surgery, the patient's ankle is fixed to the ankle fixation device, and the thigh is fixed to the leg fixation device. The positioning mechanism keeps links two and three coaxially fixed. The drive device is set to drive the slider to slide along the base. At this time, the drive device does not drive link three to swing. When the slider slides, it can drive link one to swing, causing link two to swing up and down, thus enabling the patient to perform straight leg raising training. When the patient needs to perform leg bending training after surgery, the positioning mechanism is in an unlocked state, and links two and three are in a hinged working state. The patient's knee is located at the hinge of links two and three, and the drive device is set to drive link three to swing. When link three swings, it can drive links two and one to swing, achieving leg bending training. This lower limb trainer can achieve both straight leg raising and leg bending training with a single device, reducing hospital procurement costs and reducing the overall space occupied by the equipment compared to equipping separate straight leg raising and leg bending trainers.

[0008] Preferably, the second connecting rod and the third connecting rod are hinged together by a pin. The positioning mechanism includes a positioning block, a positioning pin one, a positioning pin two, a positioning hole one, and a positioning hole two. The positioning hole one is coaxial with the pin and is opened on the second connecting rod. The positioning hole two is coaxial with the pin and is opened on the third connecting rod. One end of the positioning pin one is fixed to the positioning block, and the other end of the positioning pin one is inserted into the positioning hole one. One end of the positioning pin two is fixed to the positioning block, and the other end of the positioning pin two is inserted into the positioning hole two.

[0009] By adopting the above technical solution, when straight leg raise training is required, link two and link three are rotated to a coaxial position, and then positioning pin one and positioning pin two in the positioning block are respectively inserted into positioning hole one and positioning hole two to fix link two and link three coaxially; when bending leg training is required, positioning pin one and positioning pin two are removed from positioning hole one and positioning hole two to restore link two and link three to the hinged engagement state.

[0010] Preferably, the end of the first positioning pin away from the positioning block passes through the first positioning hole and is threadedly connected to the first nut; the positioning block is in contact with one side of the second connecting rod, and the first nut is in contact with the other side of the second connecting rod; the end of the second positioning pin away from the positioning block passes through the second positioning hole and is threadedly connected to the second nut; the positioning block is in contact with one side of the third connecting rod, and the second nut is in contact with the other side of the third connecting rod.

[0011] By adopting the above technical solution, Nut 1 and Nut 2 are connected to Positioning Pin 1 and Positioning Pin 2 respectively, and can cooperate with Positioning Block to fix Positioning Block to Link 2 and Link 3, thereby fixing Link 2 and Link 3 coaxially; when leg bending training is required, Positioning Pin 1 and Positioning Pin 2 are removed from Positioning Hole 1 and Positioning Hole 2, and Link 2 and Link 3 return to the hinged engagement state.

[0012] Preferably, the ankle fixation device includes an ankle support strip, the end of which is provided with a sleeve, the sleeve being fitted onto the connecting rod, and the ankle support strip is provided with Velcro for fixing the patient's ankle.

[0013] By adopting the above technical solution, the patient's ankle can be fixed to the ankle support strip through the Velcro strap, thereby fixing it to the connecting rod.

[0014] Preferably, the leg fixation device includes a leg support strip, the end of which is provided with a second sleeve, the second sleeve being fitted onto the third connecting rod, and the leg support strip is provided with a second Velcro fastener for fixing the patient's leg.

[0015] By adopting the above technical solution, the patient's leg can be fixed to the leg support strip through the Velcro strap 2, thereby fixing it to the connecting rod 3.

[0016] Preferably, the driving device includes a dual-head motor fixed to the base. The base is rotatably provided with a lead screw along its length. The lead screw passes through the slider and is threadedly engaged with the slider. A spline one is provided along its length at the end of the lead screw near the dual-head motor. An output shaft one is provided at the end of the dual-head motor near the lead screw. The end of the output shaft one is spaced apart from the end of the lead screw, and a spline two is provided along its length at the output shaft one. A connecting sleeve one is sleeved on the lead screw. The connecting sleeve one is slidably engaged with the spline one, and the connecting sleeve one can slide simultaneously with both the spline one and the spline two by sliding.

[0017] By adopting the above technical solution, when the dual-head motor is running, the output shaft rotates and the sliding connecting sleeve 1 slides. When the connecting sleeve 1 is connected to both spline 1 and spline 2, the torque of the output shaft 1 is transmitted to the lead screw, and the lead screw rotates to drive the slider to move for use in the straight leg lifting state. When the connecting sleeve 1 is separated from spline 2, the dual-head motor 1 runs, and the torque of the output shaft 1 is not transmitted to the lead screw. At this time, the slider does not move and is used for bent leg training.

[0018] Preferably, the dual-head motor has an output shaft two at the end opposite to the output shaft one, and the base has a rotating shaft coaxial with the output shaft two. A transmission mechanism is provided between the rotating shaft and the connecting rod three. When the rotating shaft rotates, it can drive the connecting rod three to swing through the transmission mechanism. A spline three is provided at the end of the rotating shaft near the dual-head motor, and an output shaft two is provided at the end of the dual-head motor near the rotating shaft. The output shaft two is provided with a spline four. A connecting sleeve two is sleeved on the rotating shaft. The connecting sleeve two is slidably connected to the spline three, and the connecting sleeve two can be slidably connected to both the spline three and the spline four at the same time.

[0019] By adopting the above technical solution, when connecting sleeve two is connected to spline three and spline four at the same time, the dual-head motor runs, and output shaft two can transmit torque to the rotating shaft. The rotating shaft drives connecting rod three to swing through the transmission mechanism to realize leg bending training. At this time, output shaft one of the dual-head motor is not connected to the lead screw. When connecting sleeve two is not connected to spline four, the dual-head motor runs, and the torque of output shaft two will not be transmitted to the rotating shaft.

[0020] Preferably, a pin two is fixed to one end of the connecting rod three near the base, and the pin two is rotatably mounted on the base. The transmission mechanism includes a transmission shaft, a driving gear, a driven gear, a driving wheel, a driven wheel, and a belt. The transmission shaft is rotatably mounted on the base. The driving gear is fixed to the rotating shaft. The driven gear is fixed to the transmission shaft and meshes with the driving gear. The driving wheel is coaxially fixed to the transmission shaft. The driven wheel is coaxially fixed to the pin two. The belt is connected to the driving wheel and the driven wheel to achieve transmission.

[0021] By adopting the above technical solution, the rotating shaft rotates, driving the driving gear to rotate, which in turn drives the transmission shaft to rotate through the driven gear. The transmission shaft drives the driven gear to rotate through the driving wheel and belt, thereby causing the second pin to rotate, which in turn causes the third link to swing to achieve the leg bending exercise.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. This lower limb training device can perform straight leg raise and leg bend training with one device, reducing hospital procurement costs and reducing the overall space occupied by the device compared with equipping a straight leg raise trainer and a leg bend trainer. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the structure of this application embodiment with the base omitted.

[0025] Figure 3 yes Figure 2 Enlarged view of part A.

[0026] Figure 4 yes Figure 2 Enlarged view of part B.

[0027] Explanation of reference numerals in the attached drawings: 1. Base; 11. Slide groove; 2. Slider; 3. Link 1; 4. Link 2; 5. Link 3; 6. Ankle fixation device; 61. Ankle support strip; 62. Hoop 1; 63. Velcro 1; 7. Leg fixation device; 71. Leg support strip; 72. Hoop 2; 73. Velcro 2; 8. Positioning mechanism; 81. Pin 1; 82. Positioning block; 83. Positioning pin 1; 84. Positioning pin 2; 85. Nut 1; 86. Nut 2 9. Drive unit; 91. Dual-head motor; 92. Lead screw; 921. Spline 1; 93. Output shaft 1; 931. Spline 2; 94. Connecting sleeve 1; 95. Output shaft 2; 951. Spline 4; 96. Rotating shaft; 961. Spline 3; 97. Transmission mechanism; 971. Pin 2; 972. Transmission shaft; 973. Drive gear; 974. Driven gear; 975. Drive wheel; 976. Driven wheel; 977. Belt; 98. Connecting sleeve 2. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0029] like Figure 1 , Figure 2 As shown, the lower limb trainer includes a base 1 and a slider 2, with the slider 2 slidably mounted on the base 1 along its length.

[0030] In this embodiment, the base 1 is in the shape of a long plate, and a groove 11 is provided along its length. The groove 11 extends through both sides of the base 1 along its width, and the slider 2 is slidably disposed in the groove 11.

[0031] As an alternative, a slide rail can be directly installed on the base 1, and the slider 2 can be slidably connected to the slide rail, which can also achieve the sliding cooperation between the slider 2 and the slide rail.

[0032] like Figure 1 , Figure 2 As shown, the lower limb trainer also includes a first link 3, a second link 4, and a third link 5. The lower end of the first link 3 is hinged to the slider 2; the side wall of the second link 4 is hinged to the upper end of the first link 3, and one end of the second link 4 is provided with an ankle fixation device 6 for fixing the patient's ankle; one end of the third link 5 is hinged to the base 1, and the other end of the third link 5 is hinged to the end of the second link 4 away from the ankle fixation device 6, and the third link 5 is provided with a leg fixation device 7 for fixing the patient's thigh.

[0033] In this embodiment, there are two connecting rods 1 3, 2 connecting rods 4, and 3 connecting rods 5, forming two sets of linkage mechanisms formed by connecting rods 1 3, 2 connecting rods 4, and 3 connecting rods 5, wherein the lower ends of the two connecting rods 1 3 are respectively hinged to the two ends of the slider 2.

[0034] like Figure 1 , Figure 2 As shown, in this embodiment, the ankle fixation device 6 includes an ankle support strip 61. The end of the ankle support strip 61 is provided with a collar 62, which is sleeved on the connecting rod 4. The ankle support strip 61 is provided with Velcro 63 for fixing the patient's ankle. The Velcro 63 can fix the patient's ankle on the ankle support strip 61, thereby fixing it to the connecting rod 4.

[0035] like Figure 1 , Figure 2 As shown, the leg fixation device 7 is similar to the ankle fixation device 6, including a leg support strip 71. The end of the leg support strip 71 is provided with a second sleeve 72, which is sleeved on the third connecting rod 5. The leg support strip 71 is provided with a second Velcro 73 for fixing the patient's leg. The second Velcro 73 can fix the patient's leg to the leg support strip 71, thereby fixing it to the third connecting rod 5.

[0036] As alternative solutions, ankle fixation device 6 and leg fixation device 7 can also be made using methods such as cable ties or restraint straps.

[0037] like Figure 1 , Figure 2 As shown, the lower limb trainer also includes a positioning mechanism 8, which is located at the hinge between the second link 4 and the third link 5, and is used to switch the second link 4 and the third link 5 between a coaxial fixed state and a hinged movable state.

[0038] In this embodiment, connecting rod 2 4 and connecting rod 3 are hinged together by pin 1 81. The positioning mechanism 8 includes positioning block 82, positioning pin 1 83, positioning pin 2 84, positioning hole 1 and positioning hole 2. Positioning hole 1 is coaxial with pin 1 81 and is opened on connecting rod 2 4. Positioning hole 2 is coaxial with pin 1 81 and is opened on connecting rod 3 5. One end of positioning pin 1 83 is fixed to positioning block 82, and the other end of positioning pin 1 83 is inserted into positioning hole 1. One end of positioning pin 2 84 is fixed to positioning block 82, and the other end of positioning pin 2 84 is inserted into positioning hole 2.

[0039] Preferably, the end of locating pin 83 furthest from locating block 82 passes through locating hole 1 and is threadedly connected to nut 85. Locating block 82 is in contact with one side of connecting rod 4, and nut 85 is in contact with the other side of connecting rod 4. The end of locating pin 84 furthest from locating block 82 passes through locating hole 2 and is threadedly connected to nut 86. Locating block 82 is in contact with one side of connecting rod 5, and nut 86 is in contact with the other side of connecting rod 5. Nuts 85 and 86 are connected to locating pins 83 and 84 respectively, and can cooperate with locating block 82 to fix locating block 82 to connecting rods 4 and 5, thereby fixing connecting rods 4 and 5 coaxially. When leg bending training is required, locating pins 83 and 84 are removed from locating holes 1 and 2, and connecting rods 4 and 5 return to their hinged engagement state.

[0040] like Figure 1 , Figure 2 As shown, the lower limb trainer also includes a drive device 9, which is fixed on the base 1 and can switch between two states: driving the slider 2 to slide along the base 1 and driving the linkage 3 5 to swing.

[0041] like Figure 2 , Figure 3 As shown, in this embodiment, the driving device 9 includes a dual-head motor 91, which is fixed on the base 1. The base 1 is rotatably provided with a lead screw 92 along its own length direction. The lead screw 92 passes through the slider 2 and is threadedly engaged with the slider 2. A spline 921 is provided along its own length direction at one end of the lead screw 92 near the dual-head motor 91. An output shaft 93 is provided at one end of the dual-head motor 91 near the lead screw 92. The end of the output shaft 93 is spaced apart from the end of the lead screw 92, and a spline 931 is provided along its own length direction at the output shaft 93. A connecting sleeve 94 is sleeved on the lead screw 92. The connecting sleeve 94 is slidably engaged with the spline 921, and the connecting sleeve 94 can slide simultaneously with both the spline 921 and the spline 931 by sliding.

[0042] When connecting sleeve 94 is connected to both spline 921 and spline 931, the torque of output shaft 93 is transmitted to lead screw 92. The rotation of lead screw 92 drives slider 2 to move for use in the straight leg lifting state. When connecting sleeve 94 is separated from spline 931, the dual-head motor 91 runs, and the torque of output shaft 93 is not transmitted to lead screw 92. At this time, slider 2 will not move for use in bent leg training.

[0043] like Figure 2 , Figure 4As shown, the dual-head motor 91 has an output shaft 95 at one end away from the output shaft 93. The base 1 has a rotating shaft 96 coaxial with the output shaft 95. A transmission mechanism 97 is provided between the rotating shaft 96 and the connecting rod 5. When the rotating shaft 96 rotates, it can drive the connecting rod 5 to swing through the transmission mechanism 97.

[0044] In this embodiment, a pin 971 is fixed at one end of the connecting rod 3 5 near the base 1. The pin 971 is rotatably mounted on the base 1. The transmission mechanism 97 includes a transmission shaft 972, a driving gear 973, a driven gear 974, a driving wheel 975, a driven wheel 976, and a belt 977. The transmission shaft 972 is rotatably mounted on the base 1. The driving gear 973 is fixed on the rotating shaft 96. The driven gear 974 is fixed on the transmission shaft 972 and meshes with the driving gear 973. The driving wheel 975 is coaxially fixed on the transmission shaft 972. The driven wheel 976 is coaxially fixed on the pin 971. The belt 977 is connected to the driving wheel 975 and the driven wheel 976 to achieve transmission.

[0045] Alternatively, the structure of the driving wheel 975, driven wheel 976, and belt 977 can also be achieved by using two meshing gears.

[0046] like Figure 2 , Figure 4 As shown, a spline 3 961 is provided at the end of the rotating shaft 96 near the dual-head motor 91, and an output shaft 2 95 is provided at the end of the dual-head motor 91 near the rotating shaft 96. The output shaft 2 95 is provided with a spline 4 951. A connecting sleeve 2 98 is fitted onto the rotating shaft 96. In the attached figure, for ease of display, the connecting sleeve 2 98 is moved onto the output shaft 2. In actual use, as another option, the connecting sleeve 2 98 can also be fitted onto the output shaft 2 95.

[0047] Connecting sleeve 2 98 is slidably connected to spline 3 961, and connecting sleeve 2 98 can be simultaneously connected to spline 3 961 and spline 4 951 by sliding.

[0048] When connecting sleeve 2 98 is connected to both spline 3 961 and spline 4 951, the dual-head motor 91 operates, and output shaft 2 95 can transmit torque to rotating shaft 96. Rotating shaft 96 drives connecting rod 3 5 to swing through transmission mechanism 97 to achieve leg bending training. At this time, output shaft 1 93 of dual-head motor 91 is not connected to lead screw 92. When connecting sleeve 2 98 is not connected to spline 4 951, dual-head motor 91 operates, and the torque of output shaft 2 95 is not transmitted to rotating shaft 96.

[0049] The working principle of this embodiment is as follows: When the patient needs to perform straight leg training after surgery, the patient's ankle is fixed to the ankle fixation device 6, and the thigh is fixed to the leg fixation device 7. The positioning mechanism 8 keeps the second link 4 and the third link 5 in a coaxial fixed state. The driving device 9 selects to drive the slider 2 to slide along the base 1. At this time, the driving device 9 will not drive the third link 5 to swing. When the slider 2 slides, it can drive the first link 3 to swing, so that the second link 4 can swing up and down, thereby enabling the patient to perform straight leg raising training. When the patient needs to perform leg bending training after surgery, the positioning mechanism 8 is in an unlocked state, and the second link 4 and the third link 5 are in a hinged movable cooperation state. The patient's knee is at the hinge of the second link 4 and the third link 5, and the driving device 9 selects to drive the third link 5 to swing. When the third link 5 swings, it can drive the second link 4 and the first link 3 to swing, thereby enabling leg bending training.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lower limb training device for post-orthopedic surgery, characterized in that, include: Base (1); Slider (2), the slider (2) is slidably disposed on the base (1) along the length direction of the base (1); Linkage 1 (3), the lower end of which is hinged to the slider (2); Link 2 (4), the side wall of link 2 (4) is hinged to the upper end of link 1 (3), and one end of link 2 (4) is provided with an ankle fixation device (6) for fixing the patient's ankle; Link three (5), one end of which is hinged to the base (1), and the other end of which is hinged to the end of link two (4) away from the ankle fixation device (6). Link three (5) is provided with a leg fixation device (7) for fixing the patient's thigh. Positioning mechanism (8), the positioning mechanism (8) is set at the hinge between link two (4) and link three (5), and is used to switch link two (4) and link three (5) between a coaxial fixed state and a hinged movable state; The driving device (9) is fixed on the base (1) and can switch between two states: the driving slider (2) slides along the base (1) and the driving linkage (5) swings.

2. The lower limb training device after orthopedic surgery according to claim 1, characterized in that, The second connecting rod (4) and the third connecting rod are hinged together by a pin (81). The positioning mechanism (8) includes a positioning block (82), a positioning pin (83), a positioning pin (84), a positioning hole (1), and a positioning hole (2). The positioning hole (1) is coaxial with the pin (81) and is opened on the second connecting rod (4). The positioning hole (2) is coaxial with the pin (81) and is opened on the third connecting rod (5). One end of the positioning pin (83) is fixed to the positioning block (82), and the other end of the positioning pin (83) is inserted into the positioning hole (1). One end of the positioning pin (84) is fixed to the positioning block (82), and the other end of the positioning pin (84) is inserted into the positioning hole (2).

3. The lower limb training device after orthopedic surgery according to claim 2, characterized in that, The end of the positioning pin 1 (83) away from the positioning block (82) passes through the positioning hole 1 and is threadedly connected to the nut 1 (85). The positioning block (82) is in contact with one side of the connecting rod 2 (4), and the nut 1 (85) is in contact with the other side of the connecting rod 2 (4). The end of the positioning pin 2 (84) away from the positioning block (82) passes through the positioning hole 2 and is threadedly connected to the nut 2 (86). The positioning block (82) is in contact with one side of the connecting rod 3 (5), and the nut 2 (86) is in contact with the other side of the connecting rod 3 (5).

4. The lower limb training device after orthopedic surgery according to claim 3, characterized in that, The ankle fixation device (6) includes an ankle support strip (61), and the end of the ankle support strip (61) is provided with a sleeve (62). The sleeve (62) is sleeved on the connecting rod (4). The ankle support strip (61) is provided with a Velcro strap (63) for fixing the patient's ankle.

5. The lower limb training device after orthopedic surgery according to claim 3, characterized in that, The leg fixation device (7) includes a leg support strip (71), and the end of the leg support strip (71) is provided with a sleeve two (72). The sleeve two (72) is sleeved on the connecting rod three (5). The leg support strip (71) is provided with Velcro two (73) for fixing the patient's leg.

6. The lower limb training device after orthopedic surgery according to claim 3, 4, or 5, characterized in that, The driving device (9) includes a dual-head motor (91), which is fixed on the base (1). The base (1) is rotatably provided with a lead screw (92) along its own length direction. The lead screw (92) passes through the slider (2) and is threadedly engaged with the slider (2). A spline (921) is provided at the end of the lead screw (92) near the dual-head motor (91) along its own length direction. A spline (921) is provided at the end of the dual-head motor (91) near the lead screw (92). There is an output shaft (93), the end of the output shaft (93) is spaced apart from the end of the lead screw (92), and the output shaft (93) is provided with a spline (931) along its own length direction. The lead screw (92) is fitted with a connecting sleeve (94), the connecting sleeve (94) is slidably engaged with the spline (921), and the connecting sleeve (94) can slide simultaneously with the spline (921) and the spline (931) by sliding.

7. The lower limb training device after orthopedic surgery according to claim 6, characterized in that, The dual-head motor (91) has an output shaft two (95) located at the end opposite to the output shaft one (93). The base (1) has a rotating shaft (96) coaxial with the output shaft two (95). A transmission mechanism (97) is provided between the rotating shaft (96) and the connecting rod three (5). When the rotating shaft (96) rotates, it can drive the connecting rod three (5) to swing through the transmission mechanism (97). The rotating shaft (96) is close to the dual-head motor (91). One end of the motor (91) is provided with a spline three (961), and the end of the dual-head motor (91) near the rotating shaft (96) is provided with an output shaft two (95). The output shaft two (95) is provided with a spline four (951). The rotating shaft (96) is fitted with a connecting sleeve two (98). The connecting sleeve two (98) is slidably connected to the spline three (961), and the connecting sleeve two (98) can be slidably connected to both the spline three (961) and the spline four (951).

8. The lower limb training device after orthopedic surgery according to claim 7, characterized in that, The connecting rod 3 (5) is fixed with a pin 2 (971) at one end near the base (1). The pin 2 (971) is rotatably mounted on the base (1). The transmission mechanism (97) includes a transmission shaft (972), a driving gear (973), a driven gear (974), a driving wheel (975), a driven wheel (976), and a belt (977). The transmission shaft (972) is rotatably mounted on the base (1). The driving gear (973) is fixed on the rotating shaft (96). The driven gear (974) is fixed on the transmission shaft (972) and meshes with the driving gear (973). The driving wheel (975) is coaxially fixed on the transmission shaft (972). The driven wheel (976) is coaxially fixed on the pin 2 (971). The belt (977) is connected to the driving wheel (975) and the driven wheel (976) to achieve transmission.

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