Knee joint traction therapeutic instrument

Abstract

The present application relates to lower limb rehabilitation training apparatus, especially to a knee joint traction therapy instrument, which mainly comprises a brace, an instrument shell, a guide sleeve, a drive shaft and a guide assembly, the instrument shell is internally provided with an installation chamber, and the installation chamber is provided with a driving mechanism; the guide sleeve is arranged on one side of the instrument shell and is in communication with the installation chamber, and the guide sleeve is provided with a spiral installation slot; the drive shaft is arranged in the guide sleeve, one end of the drive shaft is connected with the brace, the other end of the drive shaft is rotationally connected with the driving mechanism, and the circumferential outer surface of the drive shaft is provided with a spiral rotation guide slot; the guide assembly is connected with the guide sleeve, and the guide assembly is provided with a guide shaft which passes through the installation slot and extends into the rotation guide slot; when the drive shaft moves in the axial direction, the rotation guide slot and the guide shaft produce relative movement, the guide shaft extending into the rotation guide slot relatively slides along the rotation guide slot, so as to constrain the drive shaft and drive the drive shaft to rotate around the axis thereof while moving in the axial direction.

Description

Technical Field

[0001] This invention relates to lower limb rehabilitation training equipment, and more particularly to a knee joint traction therapy device. Background Technology

[0002] Knee pain, joint space narrowing, and deformity are common clinical conditions in orthopedics and acupuncture, particularly prominent in patients with severe knee osteoarthritis, postoperative joint adhesions, or post-traumatic functional impairment. These pathological changes not only affect the normal range of motion of the knee joint but also significantly reduce patients' quality of life. Existing treatments include acupuncture, joint manipulation, joint mobilization, and physical therapy (such as heat therapy and electrotherapy). While these can alleviate pain and improve local circulation to some extent, their actual effect on improving the joint space is limited, and they cannot fundamentally solve the problem of joint space narrowing caused by cartilage wear, joint capsule contracture, or ligament adhesions. In addition, some severely affected patients eventually require knee replacement surgery. However, postoperative complications such as joint swelling, limited mobility, and restenosis of the joint space may still occur, leading to a prolonged recovery period and even affecting the surgical outcome. Therefore, there is an urgent need for a knee traction therapy device that can effectively improve the knee joint space and assist the therapist in internal or external rotation of the affected limb while providing traction force. This device can effectively release and correct abnormal patellofemoral joint position and adhesions around the joint after knee injury. Summary of the Invention

[0003] To address the aforementioned issues, this application discloses a knee joint traction therapy device. This device, through the cooperation of a spiral guide groove and a guide shaft, enables the drive shaft to output rotational motion while moving linearly, thereby driving the affected limb to complete internal or external rotation, thus forming a compound action that combines traction and rotation. It can effectively loosen and correct patellofemoral joint positional abnormalities and periarticular adhesions that occur after knee joint injury.

[0004] It adopts the following technical solution, which includes: braces; The instrument housing has an internal mounting chamber, and a drive mechanism is installed inside the mounting chamber. A guide sleeve is disposed on one side of the instrument housing and communicates with the mounting chamber. A spiral mounting groove is formed on the outer circumferential surface of the guide sleeve. A drive shaft passes through the guide sleeve. One end of the drive shaft is connected to the support, and the other end is rotatably connected to the drive mechanism. A spiral rotating guide groove is formed on the circumferential outer surface of the drive shaft. A guide assembly connected to the guide sleeve, the guide assembly having a guide shaft passing through the mounting groove and extending into the rotary guide groove; The drive mechanism is configured to drive the drive shaft to move axially relative to the guide sleeve, so that the support moves closer to or further away from the instrument housing. When the drive shaft moves axially, the rotary guide groove and the guide shaft move relative to each other. The guide shaft, which extends into the rotary guide groove, slides relative to the rotary guide groove to constrain the drive shaft and drive the drive shaft to rotate about its own axis while moving axially.

[0005] In one illustrative embodiment of the knee traction therapy device, The mounting slot includes: a first mounting slot and a second mounting slot with opposite rotation directions and connected at both ends; The rotary guide groove includes: a first rotary guide groove and a second rotary guide groove with opposite rotation directions. The first rotary guide groove has the same rotation direction as the first mounting groove, and the second rotary guide groove has the same rotation direction as the second mounting groove. The ends of the first rotary guide groove and the second rotary guide groove that are away from the support are connected. The guide assembly has a locked state and an unlocked state. In the locked state, the relative position between the guide assembly and the guide sleeve is fixed. In the unlocked state, the guide assembly can slide relative to the guide sleeve so that the guide shaft slides within the first mounting groove and the second mounting groove. When the guide shaft is located in the first mounting groove, when the drive shaft moves to the instrument housing, the drive shaft rotates in a first rotation direction; When the guide shaft is located in the second mounting groove, the drive shaft rotates in a second rotation direction as the drive shaft moves toward the instrument housing.

[0006] In one illustrative embodiment of the knee traction therapy device, the guiding component further includes: A sliding housing, which is slidably connected to the guide sleeve, wherein the sliding housing has a receiving cavity; A spring, which is disposed within the receiving cavity; The guide shaft passes through the receiving cavity and extends along the length of the guide shaft. The guide shaft is provided with a first abutting part and a second abutting part at intervals. The first abutting part is located inside the receiving cavity, and the second abutting part is located between the outer surfaces of the sliding housing and the guide sleeve. The spring abuts against the first abutting part and provides a thrust to the first abutting part to move in the direction of the guide sleeve, so that the second abutting part is always in close contact with the outer surface of the guide sleeve to form the locking state; When the guide shaft moves axially to move the second abutting portion away from the guide sleeve, the second abutting portion separates from the outer surface of the guide sleeve to form the unlocked state.

[0007] In one illustrative embodiment of the knee traction therapy device, the drive shaft is further provided with a pair of clearance grooves, the length extension direction of the pair of clearance grooves being parallel to the axial extension direction of the drive shaft; One end of each of the two clearance grooves is connected to the end of the first rotary guide groove and the second rotary guide groove that is away from the instrument housing.

[0008] In one illustrative embodiment of the knee traction therapy device, in the height direction of the device housing, the device housing further includes a support arm located below the guide sleeve; One end of the support arm is fixedly connected to the instrument housing, and the other end of the support arm has a sliding groove, with the drive shaft located within the sliding groove.

[0009] In one illustrative embodiment of the knee traction therapy device, the driving mechanism includes: A connector is located in the mounting cavity and is rotatably connected to the end of the drive shaft opposite to the support. The connector has a first connecting part on one side, and the first connecting part has a threaded hole. A drive motor is fixedly disposed in the mounting cavity, wherein the drive motor is provided with an output shaft; A threaded rod, one end of which is fixedly connected to the output shaft, and the other end of which extends out from the threaded channel and is threadedly engaged with the threaded channel; When the output shaft rotates, the threaded rod rotates synchronously with the output shaft to drive the connector to move along the axial extension direction of the guide sleeve, and to drive the drive shaft to move axially relative to the guide sleeve.

[0010] In one illustrative embodiment of the knee traction therapy device, the driving mechanism further includes a limiting rod, which is fixedly disposed within the mounting cavity and located on one side of the axis of the guide sleeve. The connector is provided with a second connecting part, which has a connecting channel and is slidably connected to the limiting rod through the connecting channel.

[0011] In one illustrative embodiment of the knee traction therapy device, the brace includes: a leg support plate, a foot support plate, and several fixing straps. The leg support plate is fixedly connected to the foot support plate, and the leg support plate is perpendicular to the foot support plate. The side of the foot support plate opposite to the leg support plate is fixedly connected to the drive shaft. Several of the aforementioned fixing straps are respectively connected to the leg support plate and the foot support plate.

[0012] In one illustrative embodiment of the knee traction therapy device, both the leg support plate and the foot support plate have a first mounting side and a second mounting side, and the two ends of each fixing strap are respectively fixedly connected to the first mounting side and the second mounting side.

[0013] In one illustrative embodiment of the knee traction therapy device, several casters are provided at the bottom of the device housing in the height direction.

[0014] The following description, in a clear and easy-to-understand manner and with reference to the accompanying drawings, will further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the knee traction therapy device. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram illustrating one embodiment of a knee traction therapy device.

[0016] Figure 2 This is a schematic diagram illustrating the structure of the drive mechanism.

[0017] Figure 3 yes Figure 2 Enlarged diagram of point B in the middle.

[0018] Figure 4 This is a schematic diagram illustrating the structure when the drive shaft rotates.

[0019] Figure 5 This diagram illustrates the fit between the drive shaft and the guide sleeve.

[0020] Figure 6 This is a schematic diagram illustrating the structure of the first mounting groove and the first rotary guide groove.

[0021] Figure 7 This is a schematic diagram illustrating the structure of the second mounting groove and the second rotary guide groove.

[0022] Figure 8 This is a structural diagram illustrating the guide component in the locked state.

[0023] Figure 9 This is a structural diagram illustrating the guide component in the unlocked state.

[0024] Figure 10 A schematic diagram illustrating one possible implementation of a guide component.

[0025] Figure 11 A schematic diagram illustrating one possible implementation of the drive mechanism.

[0026] Figure 12 This is a schematic diagram illustrating the structure after the connector has been moved.

[0027] Figure 13 A structural diagram illustrating one possible embodiment of the support arm.

[0028] Figure 14 A schematic diagram illustrating one possible implementation of the brace.

[0029] Label Explanation 1. Instrument housing; 11. Mounting chamber; 12. Support arm; 2. Guide sleeve; 21. Mounting groove; 211. First mounting groove; 212. Second mounting groove; 3. Guide assembly; 31. Guide shaft; 311. First abutment part; 312. Second abutment part; 32. Sliding housing; 321. Receiving cavity; 33. Spring; 4. Drive shaft; 41. Rotary guide groove; 411. First rotary guide groove; 412. Second rotary guide groove; 42. Clearance groove; 5. Drive mechanism; 51. Connector; 511. First connecting part; 512. Second connecting part; 52. Drive motor; 521. Output shaft; 53. Threaded rod; 54. Limiting rod; 6. Support; 61. Leg support plate; 62. Foot support plate; 63. Fixing strap. Detailed Implementation

[0030] To provide a clearer understanding of the technical features, objectives, and effects of this application, specific embodiments of this application are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0031] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0032] To keep the drawings concise, only the parts relevant to this application are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0033] Figure 1 A schematic diagram illustrating one embodiment of a knee traction therapy device. Figure 2 This is a schematic diagram illustrating the structure of the drive mechanism. Figure 3 yes Figure 2 Enlarged diagram of point B in the middle. Figure 4 This is a schematic diagram illustrating the structure when the drive shaft rotates. Figure 5 This diagram illustrates the fit between the drive shaft and the guide sleeve. (Combined with...) Figure 1-5 This knee traction therapy device includes: a brace 6, an instrument housing 1, a guide sleeve 2, a drive shaft 4, and a guide assembly 3. The brace 6 is used to support part of the patient's lower leg, ankle joint, and foot.

[0034] like Figure 2 As shown, the instrument housing 1 has an internal mounting chamber 11, and the outer wall of the instrument housing 1 has a circular hole communicating with the mounting chamber 11. The mounting chamber 11 contains a driving mechanism 5, and a guide sleeve 2 is fixedly connected to the outer wall of the instrument housing 1 and is concentric with the circular hole. Figure 1-5 As shown, the drive shaft 4 passes through the guide sleeve 2, and one end of the drive shaft 4 is connected to the support 6, while the other end is rotatably connected to the drive mechanism 5. In this configuration, the guide sleeve 2 not only provides axial guidance for the drive shaft 4, but also effectively resists the radial bending moment and lateral force generated by the weight of the patient's affected limb, ensuring the straightness and stability of the drive shaft 4 during traction, and avoiding jamming or deviation caused by uneven force.

[0035] Combination Figure 2 as well as Figure 4 The drive mechanism 5 is configured to drive the drive shaft 4 to move axially relative to the guide sleeve 2, so that the brace 6 moves closer to or further away from the instrument housing 1. Taking the patient's right leg as an example, in the actual treatment process, the patient's foot is first placed on the brace 6, and then the drive mechanism 5 drives the drive shaft 4 to move axially in the direction of the instrument housing 1. Correspondingly, the brace 6 moves synchronously, thereby applying an axial traction force to the knee joint along the long axis of the patient's lower limb. Under the traction, the joint space between the femur and tibia increases, thereby reducing the direct pressure and friction between the bones, relieving joint compression, and improving the range of motion of the joint.

[0036] Of course, as those skilled in the art will understand, the traction force applied to the patient's knee joint is related to the amount of movement of the drive shaft 4. In actual treatment, doctors can control the amount of movement of the drive shaft 4 according to the patient's condition and tolerance, thereby applying an appropriate traction force to the patient's knee joint.

[0037] In addition, during knee traction, it is usually necessary to internally or externally rotate the affected limb at a certain angle, such as... Figure 1-3 As shown, the outer surface of the guide sleeve 2 is provided with a spiral mounting groove 21, and the outer surface of the drive shaft 4 is also provided with a spiral rotating guide groove 41. The mounting groove 21 and the rotating guide groove 41 correspond to each other. The guide assembly 3 is connected to the guide sleeve 2, and... Figure 3 as well as Figure 5 The guide assembly 3 has a guide shaft 31 that passes through the mounting groove 21 and extends into the rotary guide groove 41, and the outer surface of the guide shaft 31 is in tangential contact with the inner wall of the rotary guide groove 41, such as... Figure 2 , Figure 4 , Figure 5 As shown, when the drive mechanism 5 drives the drive shaft 4 to move axially, the rotating guide groove 41 moves relative to the guide shaft 31. Since the position between the guide shaft 31 and the guide sleeve 2 is determined, the guide shaft 31 extending into the rotating guide groove 41 will slide relative to the rotating guide groove 41 to constrain the drive shaft 4, forcing the drive shaft 4 to rotate around its own axis while moving axially. This rotation is then transmitted to the brace 6 through the drive shaft 4, thereby achieving axial traction of the affected limb while also driving the affected limb to achieve internal or external rotation.

[0038] Under the above configuration, the cooperation between the spiral guide groove and the guide shaft 31 allows the drive shaft 4 to output rotational motion while moving linearly, thereby driving the affected limb to complete internal or external rotation. This forms a compound action that combines traction and rotation, which can further loosen the adhesions of the soft tissues around the joint and improve the treatment effect. Secondly, with the cooperation of the drive mechanism 5, guide sleeve 2, guide assembly 3, and drive shaft 4, the linear movement and rotation of the drive shaft 4 are both generated by the same drive mechanism 5. This not only eliminates the need for an additional power source but also allows the rotation angle to change gradually with the axial movement, thereby driving the patient's affected limb to rotate smoothly and gently, avoiding secondary damage to the affected limb caused by sudden rotation, and improving patient tolerance. Furthermore, the above-mentioned cooperation between the drive shaft 4, guide sleeve 2, and guide assembly 3 can minimize the space occupied by the device and maintain the compactness of the overall structure.

[0039] Figure 6 This is a schematic diagram illustrating the structure of the first mounting groove and the first rotary guide groove. Figure 7This is a schematic diagram illustrating the structure of the second mounting groove and the second rotary guide groove. Specifically, the mounting groove 21 includes a first mounting groove 211 and a second mounting groove 212 with opposite rotation directions, wherein both the first mounting groove 211 and the second mounting groove 212 have a first starting end and a first ending end, as shown below. Figure 6-7 As shown, the two first starting ends are connected, and the two first ending ends are connected.

[0040] Combination Figure 6-7 The rotary guide groove 41 includes: a first rotary guide groove 411 and a second rotary guide groove 412 with opposite rotation directions, such as... Figure 6-7 As shown, the first rotary guide groove 411 and the first mounting groove 211 rotate in the same direction, and the second rotary guide groove 412 and the second mounting groove 212 rotate in the same direction. The first rotary guide groove 411 and the second rotary guide groove 412 each have a second starting end and a second ending end, and the two second ending ends are connected to form a closed guide path with bidirectional rotation on the surface of the guide sleeve 2.

[0041] Figure 8 This is a structural diagram illustrating the guide component in the locked state. Figure 9 This is a structural diagram illustrating the guide component in the unlocked state. (Combined with...) Figure 6-9 The guide component 3 has a locked state and an unlocked state. In the locked state, the relative position between the guide component 3 and the guide sleeve 2 is fixed. In the unlocked state, the guide component 3 can slide relative to the guide sleeve 2 so that the guide shaft 31 can slide in the first mounting groove 211 and the second mounting groove 212. In the above-mentioned setting direction, since the rotation directions between the first mounting groove 211 and the second mounting groove 212 and the first rotating guide groove 411 and the second rotating guide groove 412 are opposite, the doctor can select the rotation direction of the affected limb as needed and move the guide component 3 in the unlocked state so that the guide shaft 31 slides into the corresponding first mounting groove 211 or second mounting groove 212.

[0042] Combination Figure 4 as well as Figure 8 For example, when the guide shaft 31 is located in the first mounting groove 211, the drive mechanism 5 drives the drive shaft 4 to move in the direction of the instrument housing 1 (i.e., the traction direction). The guide shaft 31 slides along the first mounting groove 211 and the corresponding first rotating guide groove 411, forcing the drive shaft 4 to rotate along the first rotation direction while moving axially, thereby driving the affected limb to complete, for example, an external rotation action.

[0043] If internal rotation is required, the doctor switches the guide assembly 3 to the unlocked state, manually slides the guide assembly 3, and allows the guide shaft 31 to slide into the second mounting groove 212 via the first termination end, and then locks it again. At this time, under the same axial traction action, the guide shaft 31 will slide along the second mounting groove 212 and the second rotation guide groove 412, forcing the drive shaft 4 to rotate in the second rotation direction opposite to the first rotation direction, thus driving the affected limb to complete the internal rotation action.

[0044] Combination Figure 6-7 The second starting end is closer to the brace 6 than the second ending end. It should be noted that the maximum rotation angle of the drive shaft 4 corresponds to the distance between the guide shaft 31 and the second starting end. The farther the guide shaft 31 is from the second starting end, the greater the maximum rotation angle of the drive shaft 4. Therefore, in the above setting, the guide component 3 in the unlocked state can also be moved relative to the guide groove to change the distance between the guide shaft 31 and the second starting end, thereby adjusting the maximum rotation angle of the drive shaft 4. In actual use, the doctor can preset the initial position of the guide shaft 31 by unlocking and sliding the guide component 3 according to the actual situation of the patient's limb, thereby setting the maximum rotation angle that the patient's limb can withstand, so as to perform safe traction operation on the patient. Of course, the internal or external rotation angle can also be gradually increased according to different rehabilitation stages, that is, the training intensity can be increased, which can not only reduce the treatment risk, but also improve the treatment effect.

[0045] Combination Figure 6-7 To avoid the second starting ends of the first rotary guide groove 411 and the second rotary guide groove 412 restricting the axial movement of the drive shaft 4, such as Figure 6-7 As shown, the drive shaft 4 is also provided with a pair of clearance grooves 42. The length extension direction of the pair of clearance grooves 42 is parallel to the axial extension direction of the drive shaft 4, and the pair of clearance grooves 42 are respectively connected to two second starting ends. When the drive shaft 4 rotates to the maximum rotation angle, as the drive shaft 4 moves axially, the guide shaft 31 will slide from the first rotation guide groove 411 or the second rotation guide groove 412 into the corresponding clearance groove 42. At this time, the drive shaft 4 can continue to move axially while maintaining the maximum rotation angle. Under this setting, not only can the axial movement range of the drive shaft 4 be avoided, but the patient's affected limb can also be kept in an internal or external rotation posture. In this way, it can be stably maintained at the maximum rotation angle set by the doctor throughout the entire subsequent traction stroke, thereby improving the therapeutic effect of joint stretching.

[0046] Figure 10 A structural schematic diagram illustrating one possible implementation of a guide component. (Combined with...) Figure 8-10In this embodiment, the guide assembly 3 further includes a sliding housing 32 and a spring 33. The sliding housing 32 is slidably connected to the guide sleeve 2. The sliding housing 32 has a receiving cavity 321 inside; the spring 33 is disposed within the receiving cavity 321. Figure 10 As shown, the guide shaft 31 passes through the receiving cavity 321, and along the length extension direction of the guide shaft 31, the guide shaft 31 is provided with a first abutting part 311 and a second abutting part 312 at intervals. The first abutting part 311 is located inside the receiving cavity 321, and the second abutting part 312 is located between the outer surface of the sliding housing 32 and the guide sleeve 2.

[0047] Combination Figure 7-10 Spring 33 is sleeved on guide shaft 31, with one end of spring 33 abutting against the inner wall of receiving cavity 321 and the other end abutting against first abutting part 311. This provides a thrust to the first abutting part 311 to move in the direction of guide sleeve 2, so that the second abutting part 312 is always in close contact with the outer surface of guide sleeve 2 to form a locked state. When guide shaft 31 moves axially to move the second abutting part 312 away from guide sleeve 2, the second abutting part 312 separates from the outer surface of guide sleeve 2. At the same time, guide shaft 31 disengages from the first rotary guide groove 411 or the second rotary guide groove 412 to form an unlocked state.

[0048] With the above setup, the doctor only needs to pull the guide shaft 31 axially with one hand to release the locking state, and the guide shaft 31 will automatically return to the locking state when released. The operation is intuitive, labor-saving, and tool-free, which can shorten the operation time when switching the rotation direction of the drive shaft 4 and adjusting the angle. In addition, the continuous elastic preload provided by the spring 33 ensures that the guide assembly 3 is always in an automatic locking state during traction treatment. The friction generated by the close contact between the second abutment part 312 and the guide sleeve 2 prevents the guide assembly 3 from shifting its position due to vibration or accidental contact, ensuring that the set rotation direction and rotation angle remain constant during treatment, which can effectively reduce the chance of secondary injury to the patient during treatment.

[0049] Figure 11 A schematic diagram illustrating one possible implementation of the drive mechanism. Figure 12 This is a schematic diagram illustrating the structure after the connector has moved. (Combined with...) Figure 1-2 as well as Figure 11-12 In this embodiment, the drive mechanism 5 includes: a connector 51, a drive motor 52, and a threaded rod 53, such as... Figure 11As shown, the connector 51 is located inside the mounting chamber 11 and is rotatably connected to the end of the drive shaft 4 opposite to the support 6. A first connecting portion 511 is provided on one side of the connector 51, and the first connecting portion 511 has a threaded channel. The drive motor 52 is fixedly mounted inside the mounting chamber 11. The drive motor 52 has an output shaft 521. One end of a threaded rod 53 is fixedly connected to the output shaft 521, and the other end of the threaded rod 53 extends out from the threaded channel and is threadedly engaged with the threaded channel. Figure 11-12 As shown, the axis of the output shaft 521 of the drive motor 52 coincides with the axis of the threaded rod 53 and is parallel to the axis of the guide sleeve 2. In this configuration, the connecting piece 51 can be restricted in the axial extension direction by the drive shaft 4. At the same time, since the axis of the threaded rod 53 is located on one side of the axial direction of the drive shaft 4, when the output shaft 521 drives the threaded rod 53 to rotate, the connecting piece 51 will not rotate synchronously with the threaded rod 53, but will only move along the axial direction of the drive shaft 4, thereby smoothly pulling the drive shaft 4. As will be understood by those skilled in the art, the drive motor 52 can be a stepper motor or a servo motor. When in use, the output shaft 521 can be rotated forward or backward by changing the direction of the current input. For example, in the forward rotation state, the connector 51 drives the drive shaft 4 to move away from the patient to pull the patient's knee joint. Conversely, in the reverse rotation state, the connector 51 drives the drive shaft 4 to move towards the patient to relax the patient's knee joint. Of course, as will be understood by those skilled in the art, the range of movement of the connector 51 can be controlled by controlling the speed and running time of the drive motor 52, thereby driving the drive shaft 4 to apply a suitable traction force to the patient's knee joint.

[0050] Of course, as those skilled in the art will understand, the moving speed of the drive shaft 4 is related to the output torque of the drive motor 52. When it is necessary to quickly traction the patient's limb, the maximum torque output by the drive motor 52 at the moment of startup can be adjusted to make the drive shaft 4 move quickly to the limit position that the patient can bear through the brace 6, thereby achieving rapid traction of the patient's limb.

[0051] To further improve the stability of connector 51, such as Figure 11-12As shown, a limiting rod 54 is also provided in the installation chamber 11. The limiting rod 54 is located on one side of the axis of the guide sleeve 2 and is parallel to the axis of the guide sleeve 2. The connector 51 is provided with a second connecting part 512. The second connecting part 512 has a connecting channel and is slidably connected to the limiting rod 54 through the connecting channel. In this arrangement, the circumferential constraint of the connector 51 can be formed by the sliding cooperation between the limiting rod 54 and the connecting channel. When the threaded rod 53 rotates, it ensures that the connector 51 is always in a stable state. At the same time, the limiting rod 54 also provides axial guidance for the connector 51. When the drive shaft 4 bears the weight or lateral force of the affected limb, the connector 51 can maintain a stable linear motion posture by relying on the limiting rod 54, avoiding swaying, shaking or jamming due to uneven force.

[0052] Figure 13 This is a schematic structural diagram illustrating one possible implementation of the support arm. To enhance the support stiffness of the drive shaft 4 and further resist the bending moment generated by the weight of the patient's affected limb, such as... Figure 7 as well as Figure 13 As shown, in this embodiment, a support arm 12 is provided below the guide sleeve 2 in the height direction of the instrument housing 1. One end of the support arm 12 is fixedly connected to the outer wall of the instrument housing 1, and the other end of the support arm 12 extends away from the instrument housing 1, with a sliding groove at its end. The extension direction of the sliding groove is parallel to the axis of the guide sleeve 2, and its opening faces the drive shaft 4. The drive shaft 4 is partially accommodated in the sliding groove. In this arrangement, the support arm 12 can provide a support point for the drive shaft 4 near the side of the brace 6. When the patient's limb is placed in the brace 6, the downward bending moment generated by its gravity is transmitted through the drive shaft 4. The guide sleeve 2 can act as the main support point to bear the proximal load, while the support arm 12 forms a lifting load on the drive shaft 4 at the distal end. The two work together to effectively support the drive shaft 4, thereby preventing the drive shaft 4 from bending and deforming due to force.

[0053] Figure 14 A structural diagram illustrating one illustrative embodiment of the brace. For example... Figure 14 As shown, the brace 6 includes: a leg support plate 61, a foot support plate 62, and several fixing straps 63. The leg support plate 61 and the foot support plate 62 are fixedly connected, and the leg support plate 61 is perpendicular to the foot support plate 62. The side of the foot support plate 62 facing away from the leg support plate 61 is fixedly connected to the drive shaft 4. Both the leg support plate 61 and the foot support plate 62 have a first mounting side and a second mounting side. The two ends of each fixing strap 63 are respectively fixedly connected to the first mounting side and the second mounting side. Figure 14 As shown, the leg support plate has two fixing straps 63, and the two fixing straps 63 are arranged sequentially along the length extension direction of the leg support plate 61, while the foot support plate 62 has one fixing strap 63.

[0054] Specifically, the fixation strap 63 is a flexible strap without elasticity. Each fixation strap 63 is equipped with an adjustment buckle, which can be a D-ring buckle. The restraint of the fixation strap 63 can be adjusted through the adjustment buckle. In actual use, the patient's lower leg and foot are first passed through each fixation strap 63, and then placed on the leg support plate 61 and foot support plate 62. Then, the restraint of each fixation strap 63 is adjusted through the adjustment buckle to fix the patient's affected limb.

[0055] like Figure 14 As shown, in the height direction of the instrument housing 1, the bottom of the instrument housing 1 is provided with four casters. These casters can be casters with braking function. With this setting, it is easy for medical staff to move the instrument. In actual use, the patient usually lies flat on the hospital bed and places part of the lower leg and foot on the brace. Then, the casters are adjusted to the braking state, and then traction treatment is performed on the patient's affected limb.

[0056] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0057] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of this application and are not intended to limit the scope of protection of this application. All equivalent implementations or modifications made without departing from the spirit of the art of this application, such as combinations, divisions or repetitions of features, should be included within the scope of protection of this application.

Claims

1. A knee joint traction therapy device, characterized in that, It includes, braces; The instrument housing has an internal mounting chamber, and a drive mechanism is installed inside the mounting chamber. A guide sleeve is disposed on one side of the instrument housing and communicates with the mounting chamber. A spiral mounting groove is formed on the outer circumferential surface of the guide sleeve. A drive shaft passes through the guide sleeve. One end of the drive shaft is connected to the support, and the other end is rotatably connected to the drive mechanism. A spiral rotating guide groove is formed on the circumferential outer surface of the drive shaft. A guide assembly connected to the guide sleeve, the guide assembly having a guide shaft passing through the mounting groove and extending into the rotary guide groove; The drive mechanism is configured to drive the drive shaft to move axially relative to the guide sleeve, so that the support moves closer to or further away from the instrument housing. When the drive shaft moves axially, the rotary guide groove and the guide shaft move relative to each other. The guide shaft, which extends into the rotary guide groove, slides relative to the rotary guide groove to constrain the drive shaft and drive the drive shaft to rotate about its own axis while moving axially.

2. The knee traction therapy device as described in claim 1, characterized in that, The mounting slot includes: a first mounting slot and a second mounting slot with opposite rotation directions and connected at both ends; The rotary guide groove includes: a first rotary guide groove and a second rotary guide groove with opposite rotation directions. The first rotary guide groove has the same rotation direction as the first mounting groove, and the second rotary guide groove has the same rotation direction as the second mounting groove. The ends of the first rotary guide groove and the second rotary guide groove that are away from the support are connected. The guide component has a locked state and an unlocked state. In the locked state, the relative position between the guide component and the guide sleeve is fixed. In the unlocked state, the guide component can slide relative to the guide sleeve so that the guide shaft slides within the first mounting groove and the second mounting groove. When the guide shaft is located in the first mounting groove, when the drive shaft moves to the instrument housing, the drive shaft rotates in a first rotation direction; When the guide shaft is located in the second mounting groove, the drive shaft rotates in a second rotation direction as the drive shaft moves toward the instrument housing.

3. The knee traction therapy device as described in claim 2, characterized in that, The guiding component also includes: A sliding housing, which is slidably connected to the guide sleeve, wherein the sliding housing has a receiving cavity; A spring, which is disposed within the receiving cavity; The guide shaft passes through the receiving cavity and extends along the length of the guide shaft. The guide shaft is provided with a first abutting part and a second abutting part at intervals. The first abutting part is located inside the receiving cavity, and the second abutting part is located between the outer surfaces of the sliding housing and the guide sleeve. The spring abuts against the first abutting part and provides a thrust to the first abutting part to move in the direction of the guide sleeve, so that the second abutting part is always in close contact with the outer surface of the guide sleeve to form the locking state; When the guide shaft moves axially to move the second abutting portion away from the guide sleeve, the second abutting portion separates from the outer surface of the guide sleeve to form the unlocked state.

4. The knee joint traction therapy device as described in claim 2, characterized in that, The drive shaft is also provided with a pair of clearance slots, the length of which extends parallel to the axial extension direction of the drive shaft. One end of each of the two clearance grooves is connected to the end of the first rotary guide groove and the second rotary guide groove that is away from the instrument housing.

5. The knee traction therapy device as described in claim 1, characterized in that, In the height direction of the instrument housing, the instrument housing also includes a support arm located below the guide sleeve; One end of the support arm is fixedly connected to the instrument housing, and the other end of the support arm has a sliding groove, with the drive shaft located within the sliding groove.

6. The knee traction therapy device as described in claim 1, characterized in that, The drive mechanism includes: A connector is located in the mounting cavity and is rotatably connected to one end of the drive shaft away from the support. The connector has a first connecting part on one side, and the first connecting part has a threaded hole. A drive motor is fixedly disposed in the mounting cavity, wherein the drive motor is provided with an output shaft; A threaded rod, one end of which is fixedly connected to the output shaft, and the other end of which extends out from the threaded channel and is threadedly engaged with the threaded channel; When the output shaft rotates, the threaded rod rotates synchronously with the output shaft to drive the connector to move along the axial extension direction of the guide sleeve, and to drive the drive shaft to move axially relative to the guide sleeve.

7. The knee traction therapy device as described in claim 6, characterized in that, The driving mechanism further includes a limiting rod, which is fixedly disposed within the mounting cavity and located on one side of the axis of the guide sleeve. The connector is provided with a second connecting part, which has a connecting channel and is slidably connected to the limiting rod through the connecting channel.

8. The knee traction therapy device as described in claim 1, characterized in that, The brace includes: a leg support plate, a foot support plate, and several fixing straps. The leg support plate is fixedly connected to the foot support plate, and the leg support plate is perpendicular to the foot support plate. The side of the foot support plate opposite to the leg support plate is fixedly connected to the drive shaft. Several of the aforementioned fixing straps are respectively connected to the leg support plate and the foot support plate.

9. The knee traction therapy device as described in claim 8, characterized in that, Both the leg support plate and the foot support plate have a first mounting side and a second mounting side, and the two ends of each fixing strap are respectively fixedly connected to the first mounting side and the second mounting side.

10. The knee traction therapy device as described in claim 1, characterized in that, Several casters are provided at the bottom of the instrument housing along its height direction.

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