Limb traction device

Abstract

The invention relates to the technical field of medical apparatuses and instruments, and provides a limb traction device which comprises a traction seat used for fixing a limb of a patient and provided with a mounting via hole and a rotating hole, and the rotating hole and the mounting via hole are arranged at an interval and communicate through a mounting window; the basic shaft is arranged in the mounting through hole in a penetrating manner and is provided with a rack extending in the axial direction of the basic shaft; the driving mechanism comprises a rotating shaft rotationally connected into the rotating hole, a driving gear fixed to the rotating shaft and a clutch locking mechanism arranged on the rotating shaft; the driving gear is positioned in the rotating hole and is meshed with the rack through the mounting window; the clutch locking mechanism is matched with the traction seat, has a locking state and an unlocking state, and is provided with a driving end for receiving driving force; in the locking state, the clutch locking mechanism is in limiting fit with the traction seat to limit rotation of the rotating shaft; when the driving end receives driving force, the clutch locking mechanism and the traction seat are separated from limiting fit to be switched to an unlocking state, so that the rotating shaft drives the driving gear to rotate, and the traction seat is driven to slide along the basic shaft.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a limb traction device. Background Technology

[0002] The traction device used in limb traction surgery typically includes a base component and a limb fixation component, as well as a movable component. The patient lies on the base component (e.g., an operating table), and the movable component is connected to the limb being tractioned. The traction operation is completed by pulling the limb fixation component.

[0003] Existing technologies typically achieve traction between the base component and the limb fixation device via a trapezoidal screw drive mechanism. While these devices can provide the necessary traction force, the large size of the drive structure and its associated traction rod often occupies significant surgical space, making installation and adjustment inconvenient. In practice, medical staff must manually unlock the locking mechanism between the limb fixation device and the drive structure, move the limb fixation device to the target position, and then manually relock it. This entire process involves multiple manual adjustments, which is cumbersome and requires a high level of proficiency, leading to prolonged preoperative preparation time and impacting surgical efficiency and user experience. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a limb traction device.

[0005] This application provides a limb traction device, comprising: A traction seat for fixing a patient's limbs, and is provided with an installation through hole and a rotation hole, wherein the rotation hole and the installation through hole are spaced apart and communicate with each other through an installation window; A base shaft, used to connect the base component, passes through the mounting hole and is provided with a rack extending axially along the base shaft; The drive mechanism includes a rotating shaft rotatably connected in the rotating hole, a drive gear fixed on the rotating shaft, and a clutch locking mechanism provided on the rotating shaft; The drive gear is located in the rotating hole and meshes with the rack through the mounting window; The clutch locking mechanism cooperates with the traction seat and has a locked state and an unlocked state, as well as a drive end that receives driving force; In the locked state, the clutch locking mechanism engages with the traction seat to limit the rotation of the shaft; when the drive end receives driving force, the clutch locking mechanism disengages from the traction seat to switch to the unlocked state, causing the shaft to drive the drive gear to rotate and drive the traction seat to slide along the base shaft.

[0006] Optionally, the clutch locking mechanism includes a limiting ring disposed on the traction seat, a drive disc movably sleeved on the rotating shaft, a driven disc fixedly sleeved on the rotating shaft, and a limiting assembly; The driven disk is located inside the limiting ring and is provided with a mounting groove, and the driving disk is provided with a driving column that extends into the mounting groove; An inclined surface is formed on the groove wall facing the inner wall of the limiting ring of the mounting groove, and the inclined surface gradually moves away from the inner wall of the limiting ring in the circumferential direction of the rotating shaft from the first end to the second end. The limiting component includes a rolling element and a limiting elastic element that abut against the inclined surface; The drive column is located on the side of the rolling element away from the second end, and the limiting elastic element is disposed between the rolling element and the side wall of the mounting groove to drive the rolling element to move toward the drive column. In the locked state, the rolling element is clamped by the inclined surface and the inner wall of the limiting ring to restrict the driven disk from rotating in the direction from the first end to the second end; when the driving disk is driven to rotate, the rolling element moves along the second end facing the inclined surface to release the clamping lock on the rolling element, so that the driving disk drives the rotating shaft to rotate through the driven disk.

[0007] Optionally, the drive column and the mounting groove are spaced apart on both sides of the circumference of the rotating shaft, and the number of the limiting components is two, which are respectively located on both sides of the drive column; The mounting groove has two inclined surfaces corresponding to the two rolling elements. The first ends of the two inclined surfaces are located in the middle of the mounting groove, and the two rolling elements abut against the two inclined surfaces. The two limiting elastic elements drive the two rolling elements to move toward the first end of the corresponding inclined surface, respectively. In the locked state, each of the rolling elements abuts against the inner wall of the limiting ring and the corresponding inclined surface to restrict the driven disk from rotating relative to the limiting ring; When the drive disk is driven to rotate by an external force, the rolling elements on both sides of the drive column move toward the second end of the corresponding inclined surface to release the rotation limit on the driven disk.

[0008] Optionally, the number of mounting slots is multiple, the drive disk is provided with multiple drive columns, and the number of limiting components is multiple sets; The plurality of mounting slots are arranged circumferentially on the driven disk along the rotating shaft, and the plurality of drive columns are correspondingly arranged in the plurality of mounting slots, with the limiting component installed in each mounting slot; And / or, the limiting component further includes a telescopic column arranged circumferentially along the rotating shaft, one end of the telescopic column being connected to the inner wall of the mounting groove, and the other end abutting against the rolling element, the limiting elastic element being disposed on the telescopic column, and the telescopic column extending and retracting synchronously with the deformation of the limiting elastic element.

[0009] Optionally, the drive disc is located on the side of the driven disc away from the drive gear, and a traction knob is rotatably connected to the end of the rotating shaft, the traction knob being fixedly connected to the drive disc.

[0010] Optionally, there are two clutch locking mechanisms, which are respectively located on opposite sides of the traction seat and connected to the rotating shaft. The drive ends of the two clutch locking mechanisms are respectively exposed on opposite sides of the traction seat.

[0011] Optionally, it also includes an unlocking part and a first reset elastic element, wherein the unlocking part is rotatably connected to the traction seat via a pin, so that the unlocking part can move between the locked position and the unlocked position around the pin; The two ends of the first reset elastic member are respectively connected to the traction seat and the unlocking part to drive the unlocking part to move toward the locked position; The limiting ring is rotatably connected to the traction seat; When the locking position is reached, the unlocking part engages with the limiting ring to limit the rotation of the limiting ring relative to the traction seat. When the unlocking part is in the unlocked position, it disengages from the limiting ring, allowing the limiting ring to rotate relative to the traction seat.

[0012] Optionally, the outer wall surface of the limiting ring is provided with a continuous tooth structure, and the unlocking part is provided with positioning teeth that match the tooth structure; When the unlocking part is in the locked position, the positioning tooth engages with the tooth structure; when the unlocking part is in the unlocked position, the positioning tooth disengages from the tooth structure.

[0013] Optionally, the base shaft includes a fixed shaft, an end cap, a sleeve portion, and a first spring; One end of the fixed shaft is a mounting end for connecting the base component. A limiting fit part is protruding on the outer peripheral surface of the fixed shaft. The end cap is movably sleeved on the fixed shaft and is located on the side of the limiting fit part facing the mounting end. The first spring is sleeved on the fixed shaft, and its two ends abut against the end cap and the limiting fitting part, respectively; The sleeve portion is sleeved on the outside of the fixed shaft and the first spring. The sleeve portion is circumferentially limited to the fixed shaft and can slide relative to the fixed shaft along the axial direction of the fixed shaft. The sleeve portion is fixedly connected to the end cap, and the rack is disposed on the outer wall surface of the sleeve portion; As the distance between the traction seat and the end cover gradually decreases, the first spring is compressed, causing the elastic force to gradually increase.

[0014] Optionally, the base shaft may further include a second spring; The second spring is disposed on the side of the limiting fitting part away from the end cover, and the two ends of the second spring abut against the inner wall surface of the sleeve part and the limiting fitting part, respectively. As the distance between the traction seat and the end cover gradually decreases, the elastic force of the second spring gradually decreases. The outer side of the sleeve portion is provided with an identification window that communicates with the interior of the sleeve portion, and part of the fixed shaft is exposed in the identification window; The outer side of the sleeve is provided with an identification part, which is located at the edge of the identification window. The identification part displays the traction force provided by the traction seat by marking the relative movement distance between the fixed shaft and the sleeve along the axial direction of the fixed shaft.

[0015] Optionally, a limit post may also be included; The traction seat is provided with a limiting hole that communicates with the mounting through hole, and the limiting post is slidably disposed in the limiting hole, so that the limiting post can move between the limiting position and the releasing position. The sleeve portion includes an inner sleeve and an outer sleeve, both sleeved on the fixed shaft; The inner sleeve is connected to the end cap and is circumferentially limited to the fixed shaft. The outer wall surface of the inner sleeve is provided with a plurality of teeth extending axially along the fixed shaft, and the plurality of teeth are arranged circumferentially along the fixed shaft. The outer sleeve is fitted onto the outside of the inner sleeve and has a mating through hole extending axially. The limiting post is inserted into the mating through hole to restrict the relative rotation of the outer sleeve and the traction seat; The limiting post extends out of the mating through hole at the limiting position to engage with the teeth, thereby restricting the rotation of the outer sleeve relative to the inner sleeve; the limiting post retracts into the mating through hole at the releasing position and disengages from the teeth, so that the traction seat and the outer sleeve can rotate synchronously relative to the inner sleeve.

[0016] Optionally, the limb traction device further includes an unlocking handle rotatably connected to the traction seat. The unlocking handle is connected to the limiting post. The unlocking handle can rotate relative to the traction seat to drive the limiting post to slide within the limiting hole, thereby switching the limiting post between the release position and the limiting position.

[0017] Optionally, the end of the limiting post away from the inner sleeve is connected to a fixed cover via an auxiliary spring. The fixed cover is fixedly connected to the traction seat, and the auxiliary spring drives the limiting post to move toward the limiting position.

[0018] Optionally, it also includes a traction bracket and a limiting structure. The traction seat is provided with an assembly groove, and the limiting structure is disposed in the assembly groove. The traction bracket is plugged into the assembly groove. When the limiting structure is in the limiting state, it can prevent the traction bracket from disengaging from the assembly groove. When the limiting structure is in the releasing state, the traction bracket can disengage from the assembly groove.

[0019] Optionally, the limiting structure includes a frame portion, a second reset elastic element, and a mounting cover; The traction seat is provided with a sliding channel and an operating hole that are both connected to the assembly groove, and the operating hole is arranged opposite to the sliding channel; The frame portion is slidably disposed within the sliding channel and partially extends into the assembly slot, allowing the frame portion to move between a snap-in position and a release position; The mounting cover is fixed to the port of the sliding channel away from the assembly groove, and the second reset elastic element is connected between the frame part and the mounting cover to drive the frame part to move toward the snap-fit ​​position; The frame portion has a button portion formed on its outer wall surface. The button portion passes through the operation hole. The button portion is pressed to drive the frame portion to slide to the release position. The traction bracket has a mating part and a positioning part, and the mating part is disposed on the positioning part; When the frame part is in the snap-fit ​​position, the positioning part is inserted into the assembly slot, and the fitting part is snap-fitted with the frame part; when the frame part is in the release position, it can disengage from the fitting part.

[0020] Optionally, the mating part includes a connector fixed to the positioning part and a limiting head fixed to the end of the connector; The radial dimension of the limiting head is larger than that of the connector, and the frame part is provided with an assembly through hole in the middle; When the frame is in the released position, the mounting through hole is located at the set position facing the connector, allowing the limiting head to pass through the mounting through hole; when the frame is in the snap-fit ​​position, the mounting through hole deviates from the set position, causing the limiting head to be blocked on the side of the frame facing away from the mounting groove, thereby restricting the traction bracket from disengaging from the traction seat.

[0021] Optionally, one of the outer peripheral surface of the positioning part and the inner wall of the assembly groove is provided with a positioning protrusion, and the other is provided with a positioning groove. When the positioning part is inserted into the assembly groove, the positioning protrusion engages with the positioning groove to restrict the rotation of the traction bracket relative to the traction seat. The technical solution provided in this application has the following advantages compared with the prior art: The limb traction device provided in this application, when the driving end is not subjected to driving force, has a clutch locking mechanism that engages with the traction seat to limit the rotation of the rotating shaft relative to the traction seat, thereby restricting the sliding of the traction seat relative to the base shaft and locking the traction position. When the traction position needs to be adjusted, the driving end of the clutch locking mechanism is subjected to force to switch the clutch locking mechanism to the unlocked state. At this time, the rotating shaft rotates, driving the drive gear to rotate synchronously. Through the meshing of the drive gear and the rack, the traction seat is driven to slide axially along the base shaft, thereby tractioning the patient's limb. After the driving force is stopped, the clutch locking mechanism automatically resets to the locked state, completing the traction positioning. The transmission structure using a rack and gear engagement replaces the traditional trapezoidal screw transmission mechanism, which helps to reduce the size of the transmission structure and the matching traction rod, effectively saving surgical space and simplifying the overall structure of the device. The automatic locking and unlocking of the shaft is achieved through a clutch locking mechanism, eliminating the need for medical staff to manually perform multiple locking and unlocking operations. This simplifies the operation process, reduces the requirement for operational proficiency, significantly shortens preoperative preparation time, and improves surgical efficiency and user experience. Furthermore, the locked state can stably restrict the movement of the traction seat, ensuring the safety and stability of the traction process. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the limb traction device described in the embodiments of this application; Figure 2 This is an exploded view of the limb traction device described in the embodiments of this application; Figure 3 This is an exploded view of the drive mechanism described in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the traction seat described in the embodiment of this application; Figure 5 This is a schematic diagram of the structure of the rotating shaft described in the embodiment of this application; Figure 6 This is a schematic diagram of the limiting ring described in an embodiment of this application; Figure 7 This is a schematic diagram of the driven disk described in an embodiment of this application; Figure 8 This is a schematic diagram of the drive disk structure described in the embodiments of this application; Figure 9 This is a schematic diagram of the structure of the fixed shaft described in an embodiment of this application; Figure 10 This is a schematic diagram of the end cap structure described in an embodiment of this application; Figure 11 This is a schematic diagram of the inner sleeve structure described in the embodiments of this application; Figure 12 This is a schematic diagram of the outer sleeve structure described in an embodiment of this application; Figure 13 The unlocking handle described in the embodiments of this application; Figure 14 This is a schematic diagram of the unlocking part described in an embodiment of this application; Figure 15 This is a schematic diagram of the structure of the limiting post described in the embodiment of this application; Figure 16 This is a schematic diagram of the frame section described in an embodiment of this application; Figure 17 This is a schematic diagram of the structure of the mounting cover described in an embodiment of this application; Figure 18 This is a schematic diagram of the traction bracket described in the embodiment of this application; Figure 19 This is a schematic diagram of the connector described in an embodiment of this application.

[0025] Among them, 1. Traction seat; 11. Mounting through hole; 12. Rotating hole; 13. Mounting window; 14. Limiting hole; 15. Assembly groove; 151. Positioning protrusion; 16. Sliding channel; 17. Unlocking handle; 2. Base shaft; 21. Rack; 22. Fixed shaft; 221. Limiting mating part; 222. First keyway; 23. End cover; 24. Inner sleeve; 240. Marking window; 241. Marking part; 242. Gear part; 243. Second keyway; 25. Outer sleeve; 251. Mating through hole; 26. First spring; 27. Second spring; 28. Bushing; 3. Drive mechanism; 31. Rotating shaft; 32. Drive gear; 33. Limiting ring; 33 1. Gear structure; 34. Drive disc; 341. Drive column; 35. Driven disc; 351. Mounting groove; 352. Inclined surface; 36. Limiting assembly; 361. Rolling element; 362. Limiting elastic element; 37. Traction knob; 41. Unlocking part; 411. Positioning tooth; 42. First reset elastic element; 43. Pin; 5. Limiting column; 51. Mating tooth; 52. Pin hole; 53. Mounting surface; 61. Frame part; 611. Assembly through hole; 62. Second reset elastic element; 63. Mounting cover; 7. Traction bracket; 71. Mating part; 711. Connector; 712. Limiting head; 72. Positioning part; 721. Positioning groove; 8. Connecting part. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0028] In limb traction surgery, commonly used traction devices typically include a base component (such as an operating table) and a limb fixation device for immobilizing the patient's limb. In existing technologies, traction is often achieved through a mechanical transmission mechanism, such as a trapezoidal screw, between the base component and the limb fixation device. While these devices can provide the necessary traction force, their transmission structure and connected traction rods are often large, occupying significant surgical space and making installation and adjustment inconvenient.

[0029] In practice, medical staff need to manually release the lock between the limb fixation device and the transmission mechanism, move the fixation device to the required position, and then manually lock it again. This process involves multiple manual adjustments, which is tedious and requires a high level of skill from the operator. It can easily lead to a prolonged preoperative preparation time, thereby affecting surgical efficiency and the overall user experience.

[0030] To solve the above technical problems, refer to Figures 1 to 19 As shown, this application provides a limb traction device, including: a traction seat 1 for fixing a patient's limb, and having an installation through hole 11 and a rotating hole 12, the rotating hole 12 being spaced apart from the installation through hole 11 and communicating through an installation window 13; a base shaft 2 for connecting a base component, passing through the installation through hole 11, and having a rack 21 extending axially along the base shaft 2; and a drive mechanism 3 including a rotating shaft 31 rotatably connected in the rotating hole 12, a drive gear 32 fixed on the rotating shaft 31, and a drive gear 32 disposed on the rotating shaft 31. The clutch locking mechanism is located in the rotating hole 12 and meshes with the rack 21 through the mounting window 13. The clutch locking mechanism cooperates with the traction seat 1 and has a locked state and an unlocked state, as well as a drive end that receives driving force. In the locked state, the clutch locking mechanism and the traction seat 1 are in a limiting cooperation to restrict the rotation of the rotating shaft 31. When the drive end receives driving force, the clutch locking mechanism and the traction seat 1 are disengaged from the limiting cooperation to switch to the unlocked state, so that the rotating shaft 31 drives the drive gear 32 to rotate and drives the traction seat 1 to slide along the base shaft 2.

[0031] The limb traction device provided in this application, when the driving end is not subjected to driving force, has a clutch locking mechanism that engages with the traction seat 1 to limit the rotation of the rotating shaft 31 relative to the traction seat 1, thereby restricting the sliding of the traction seat 1 relative to the base shaft 2 and locking the traction position. When the traction position needs to be adjusted, the driving end of the clutch locking mechanism is subjected to force to switch the clutch locking mechanism to the unlocked state. At this time, the rotating shaft 31 rotates, driving the driving gear 32 to rotate synchronously. Through the meshing of the driving gear 32 and the rack 21, the traction seat 1 is driven to slide along the axial direction of the base shaft 2, thereby tractioning the patient's limb. After the driving force is stopped, the clutch locking mechanism automatically resets to the locked state, completing the traction positioning. The transmission structure using a rack and gear engagement replaces the traditional trapezoidal screw transmission mechanism, which helps to reduce the volume of the transmission structure and the matching traction rod, effectively saving surgical space and simplifying the overall structure of the device. The automatic locking and unlocking of the rotating shaft 31 is achieved through a clutch locking mechanism, eliminating the need for medical staff to manually perform multiple locking and unlocking operations. This simplifies the operation process, reduces the requirement for operational proficiency, significantly shortens preoperative preparation time, and improves surgical efficiency and user experience. Furthermore, the locked state can stably restrict the movement of the traction seat, ensuring the safety and stability of the traction process.

[0032] Specifically, the traction seat 1, as the core supporting component for supporting and fixing the patient's limb, has a block-shaped structure and two pre-set functional channels inside: an installation through hole 11 and a rotation hole 12. The installation through hole 11 is set through the length of the traction seat 1 for the base shaft 2 to pass through, and the rotation hole 12 is set through the width of the traction seat 1.

[0033] One end of the mounting window 13 forms an opening in the inner wall of the mounting hole 11, and the other end forms an opening in the inner wall of the rotating hole 12. The size of the mounting window 13 is adapted to the meshing requirements of the subsequent drive gear 32 and rack 21, ensuring stable transmission between the two. The top or side of the traction seat 1 may also be provided with a slot or strap mounting structure adapted to limb fixation to achieve stable fixation of the patient's limb.

[0034] The base shaft 2 is a long, rigid structure. One end is used for fixed connection to the base components such as the operating table, which can be detachably fixed using conventional connectors such as flanges and bolts. The outer diameter of the base shaft 2 is matched with the inner diameter of the mounting hole 11 of the traction seat 1, ensuring that the base shaft 2 can slide smoothly relative to the traction seat 1 after passing through the mounting hole 11, without significant shaking during the sliding process. On the outer wall of the base shaft 2, a rack 21 is integrally formed or fixedly connected along its axial direction. The tooth profile and pitch of the rack 21 are matched with the drive gear 32. The length of the rack 21 covers the maximum stroke range required for traction operation, ensuring the continuity of the traction process.

[0035] The drive mechanism 3 is the core of power transmission that enables the traction seat 1 to move along the base shaft 2. The rotating shaft 31 is a cylindrical rigid shaft whose outer diameter is adapted to the inner diameter of the rotating hole 12 of the traction seat 1. It is rotatably connected to the inner wall of the rotating hole 12 through a bearing. At least one end of the rotating shaft 31 is exposed on the outside of the traction seat 1, so that the drive end of the clutch locking mechanism can be exposed on the outside of the traction seat 1, which facilitates the operator to apply force to the drive end. The drive end can receive the driving force output by manual or motor.

[0036] The drive gear 32 is a ring gear structure, which is fixedly sleeved in the middle of the rotating shaft 31 by key connection or interference fit. The entire drive gear 32 is located inside the rotating hole 12, and part of its teeth extends into the area of ​​the mounting hole 11 through the mounting window 13 to precisely mesh with the rack 21 on the base shaft 2 to realize the transmission of power.

[0037] Reference Figures 3 to 8As shown, in some embodiments, the clutch locking mechanism includes a limiting ring 33 disposed on the traction seat 1, a drive disc 34 movably sleeved on the rotating shaft 31, a driven disc 35 fixedly sleeved on the rotating shaft 31, and a limiting assembly 36; the driven disc 35 is located inside the limiting ring 33 and is provided with a mounting groove 351, and the drive disc 34 is provided with a drive post 341 extending into the mounting groove 351; an inclined surface 352 is formed on the groove wall of the mounting groove 351 facing the inner wall of the limiting ring 33, and the inclined surface 352 gradually moves away from the inner wall of the limiting ring 33 in the circumferential direction of the rotating shaft 31 from the first end to the second end; the limiting assembly 36 includes a rolling element 36 abutting against the inclined surface 352. 1. A limiting elastic element 362; the drive column 341 is located on the side of the rolling element 361 away from the second end, and the limiting elastic element 362 is disposed between the rolling element 361 and the side wall of the mounting groove 351 to drive the rolling element 361 to move toward the drive column 341; in the locked state, the rolling element 361 is clamped by the inclined surface 352 and the inner wall of the limiting ring 33 to restrict the driven disk 35 from rotating in the direction from the first end to the second end; when the drive disk 34 is driven to rotate, the rolling element 361 moves along the inclined surface 352 toward the second end to release the clamping lock on the rolling element 361, so that the drive disk 34 drives the rotating shaft 31 to rotate through the driven disk 35.

[0038] This configuration utilizes the cooperation of the rolling element 361, the inclined surface 352, and the limiting elastic element 362 to achieve locking and unlocking. The rolling element 361 reduces friction during clutch switching, making the unlocking operation smoother and less strenuous, thus reducing the workload for medical personnel. Simultaneously, the combined space occupied by the rolling element 361, the limiting elastic element 362, and the mounting groove 351 is small, reducing the size of the drive mechanism 3 and thereby miniaturizing the limb traction device.

[0039] Specifically, the limiting ring 33 is a ring structure, which is fixed at the end of the traction seat 1 by bolts or snap-fit, and is arranged coaxially with the rotating hole 12. The rotation of the limiting ring 33 relative to the traction seat 1 is restricted, that is, the limiting ring 33 and the traction seat 1 remain relatively stationary.

[0040] The drive disc 34 is a circular disc-shaped structure with a through hole in its center that matches the rotating shaft 31. It is movably fitted onto the rotating shaft 31 with a clearance fit. The drive disc 34 can rotate relative to the rotating shaft 31, thus constituting the drive end of the clutch locking mechanism. On the end face of the drive disc 34 facing the driven disc 35, at least one drive post 341 is integrally formed. The drive post 341 is a cylindrical or prismatic structure that extends along the axial direction of the drive disc 34, and its number matches the number of mounting slots 351 of the driven disc 35.

[0041] The driven disk 35 has a circular disc structure, with its outer diameter slightly smaller than the inner diameter of the limiting ring 33. It is fixedly sleeved on the rotating shaft 31 by key connection or interference fit to achieve synchronous rotation between the driven disk 35 and the rotating shaft 31. The driven disk 35 is located entirely within the inner region of the limiting ring 33 so that the rolling element 361 can fully cooperate with the inner wall of the limiting ring 33.

[0042] The outer peripheral surface of the driven disk 35 is recessed to form a mounting groove 351, and the mounting groove 351 is provided with a notch on the side wall near the drive disk 34. The notch extends along the circumference of the driven disk 35. The drive column 341 extends into the mounting groove 351 through the notch. When the drive disk 34 rotates, the drive column 341 moves in the mounting groove 351 and pushes the rolling element 361.

[0043] An inclined surface 352 is formed on the side of the mounting groove 351 facing the inner wall of the limiting ring 33. The two ends of the inclined surface 352 along the circumference of the rotating shaft 31 are a first end and a second end, respectively. The distance between the first end and the inner wall of the limiting ring 33 is less than the distance between the second end and the limiting ring 33. The rolling element 361 abuts against the inclined surface 352. When the drive column 341 moves from the first end to the second end, the rolling element 361 can move along the inclined surface 352 towards the second end, so that the rolling element 361 moves away from the inner wall of the limiting ring 33, thereby releasing the clamping of the inner wall of the limiting ring 33 and the inclined surface 352 on the rolling element 361.

[0044] The rolling element 361 can be either a cylindrical roller or a spherical ball. The rolling element 361 abuts against the inclined surface 352 and the inner wall of the limiting ring 33. When the rolling element 361 moves along the inclined surface 352 toward the first end, it will also move toward the inner wall of the limiting ring 33 under the action of the inclined surface 352, so that the rolling element 361 acts as a wedge and engages between the driven disk 35 and the limiting ring 33, restricting the driven disk 35 from rotating in the direction from the first end toward the second end.

[0045] Taking an inclined surface 352 formed in the mounting groove 351 and a rolling element 361 installed as an example: when the drive disk 34 rotates in the direction from the first end to the second end, the drive column 341 will push the rolling element 361 to move towards the second end, so that the rolling element 361 moves away from the inner wall of the limiting ring 33 along the inclined surface 352 and is released from the clamped state, so that the driven disk 35 can rotate within the limiting ring 33. At this time, the drive disk 34 drives the driven disk 35 to rotate in the direction from the first end to the second end.

[0046] When the drive disc 34 rotates in the direction from the second end to the first end, the drive column 341 abuts against the side wall of the mounting groove 351 and pushes the driven disc 35 to move in the direction from the second end to the first end. At this time, the relative movement direction of the rolling element 361 and the driven disc 35 is towards the first end, which is equivalent to the rolling element 361 moving towards the first end, so that the driven disc 35 can rotate relative to the limiting ring 33.

[0047] When traction is applied to the limb, the force is applied to the traction seat 1. The traction seat 1 will apply a force to the rotating shaft 31 through the cooperation of the drive gear 32 and the rack 21. That is, the driven plate 35 will rotate under force during traction. When the driven plate 35 rotates in the direction from the first end to the second end, it is equivalent to the rolling element 361 moving towards the first end. At this time, the rotation of the driven plate 35 is restricted, and the position of the traction seat 1 is fixed and will not move, so that the traction seat 1 can stably traction the limb.

[0048] When the operator pushes the traction seat 1 in the opposite direction of the force applied to the traction limb, the driven plate 35 rotates in the direction from the second end toward the first end, which is equivalent to the rolling element 361 moving toward the second end. At this time, the driven plate 35 can rotate, and the position of the traction seat 1 can be coarsely adjusted.

[0049] When the limb applies an external force to the traction seat 1 in a direction away from the base component, and the drive disc 34 is not subjected to a force, the external force of the limb on the traction seat 1 causes the traction seat 1 to move in a direction away from the base component. The corresponding rotation direction of the driven disc 35 is the direction from the first end to the second end. At this time, the rotation of the driven disc 35 is restricted, the locking clutch mechanism is in a locked state, and the position of the traction seat 1 is locked and will not move in a direction away from the base component.

[0050] The operator can apply an external force to the traction seat 1, causing the traction seat 1 to move along the base shaft 2 toward the base component. The rotation direction of the driven plate 35 is the direction from the second end to the first end. The driven plate 35 can rotate within the limiting ring 33, thereby allowing for convenient adjustment of the position of the coarse adjustment traction seat 1.

[0051] The operator can drive the drive disk 34 to rotate clockwise or counterclockwise to disengage the rolling element 361 from the clamped state, so that the driven disk 35 can drive the rotating shaft 31 to rotate, thereby adjusting the position of the traction seat 1.

[0052] The limiting elastic element 362 is a compression spring, with one end abutting against the side wall of the mounting groove 351 and the other end abutting against the rolling element 361. The limiting elastic element 362 always applies an elastic driving force to the rolling element 361 in the direction of the drive column 341, pushing the rolling element 361 to move along the inclined surface 352 toward the drive column 341.

[0053] In the locked state, the limiting elastic element 362 pushes the rolling element 361 to move along the inclined surface 352 toward the drive column 341, that is, the limiting elastic element 362 drives the rolling element 361 to move toward the first end, so that the rolling element 361 simultaneously forms a tight abutment with the inclined surface 352 and the inner wall of the limiting ring 33. The rolling element 361 is squeezed between the inclined surface 352 and the inner wall of the limiting ring 33, and the position of the rolling element 361 is fixed and cannot rotate, so that the driven disk 35 cannot rotate relative to the limiting ring 33; since the limiting ring 33 is fixed relative to the traction seat 1, the rotation of the driven disk 35 is restricted, thus restricting the rotation of the rotating shaft 31, and finally achieving the position locking of the traction seat 1.

[0054] When it is necessary to unlock and adjust the position of the traction seat 1, a driving force is applied to the drive disc 34, causing the drive disc 34 to rotate in the direction from the first end to the second end. This causes the drive column 341 to rotate synchronously. The side wall of the drive column 341 generates a thrust on the rolling element 361 towards the second end. This thrust overcomes the elastic force of the limiting elastic element 362 and pushes the rolling element 361 to move along the inclined surface 352 towards the second end, causing the rolling element 361 to disengage from the clamped state. This releases the limit between the driven disc 35 and the limiting ring 33. At this time, the driven disc 35 can rotate relative to the limiting ring 33, causing the drive disc 34 to drive the rotating shaft 31 to rotate through the driven disc 35. This drives the traction seat 1 to slide along the base shaft 2 away from the base component through the meshing transmission of the drive gear 32 and the rack 21.

[0055] When the drive disc 34 rotates in the direction from the second end toward the first end, the drive column 341 abuts against the side wall of the mounting groove 351 and pushes the driven disc 35 to rotate in the direction from the second end toward the first end, causing the traction seat 1 to slide in the direction along the base shaft 2 toward the base component.

[0056] After the driving force is stopped, the elastic force of the limiting elastic member 362 pushes the rolling member 361 to reset again. The rolling member 361 returns to the state of abutting against the inner wall of the inclined surface 352 and the limiting ring 33, and relocks the rotating shaft 31, ensuring that the traction position will not move away from the base component, so that the traction seat 1 can maintain a stable position and continuously traction the limb.

[0057] Furthermore, in some embodiments, the drive column 341 and the mounting groove 351 are spaced apart on both sides of the circumference of the rotating shaft 31, and the number of limiting components 36 is two, which are respectively disposed on both sides of the drive column 341; two inclined surfaces 352 corresponding to the two rolling elements 361 are formed in the mounting groove 351, the first ends of the two inclined surfaces 352 are located in the middle of the mounting groove 351, and the two rolling elements 361 abut against the two inclined surfaces 352; the two limiting elastic elements 362 drive the two rolling elements 361 to move toward the first end of the corresponding inclined surface 352 respectively; in the locked state, each rolling element 361 abuts against the inner wall of the limiting ring 33 and the corresponding inclined surface 352 to restrict the driven disk 35 from rotating relative to the limiting ring 33; when the drive disk 34 is driven by the outside to rotate, the rolling elements 361 on both sides of the drive column 341 move toward the second end of the corresponding inclined surface 352 to release the rotation limitation on the driven disk 35.

[0058] This configuration, with the symmetrical arrangement of the two limiting components 36, makes the locking state of the clutch locking mechanism more stable, effectively withstanding bidirectional impact forces that may occur during traction, improving the safety and reliability of the device, and preventing traction accidents caused by a single limiting component 36 only automatically limiting the traction seat 1 in one direction. The synergistic effect of the two limiting components 36 balances the force on the drive column 341, reducing component wear and extending the service life of the device. When the clutch locking mechanism is in the locked state, the bidirectional limiting structure effectively avoids the problem of uneven force distribution that may occur with a single limiting component 36, making the locking more stable, and ensuring that the traction seat 1 will not slip unexpectedly even when subjected to reverse impact forces during traction.

[0059] Specifically, the drive column 341 on the drive disk 34 extends into the mounting groove 351 of the driven disk 35. Both the drive column 341 and the mounting groove 351 have reserved space for movement on both sides of the circumference of the rotating shaft 31. That is, the drive column 341 is located in the middle of the mounting groove 351, and both sides form areas for the installation and movement of the limiting component 36.

[0060] Two limiting components 36 are provided, symmetrically positioned on both sides of the drive column 341 and equidistant from it. The limiting elastic element 362 is also a compression spring with identical specifications to ensure that the elastic driving force of the two limiting components 36 is the same.

[0061] Two inclined surfaces 352 are machined into the bottom of the mounting groove 351 of the driven disc 35. The two inclined surfaces 352 are symmetrically arranged, with their first ends close to each other, so that the first ends of the two inclined surfaces 352 are located in the middle of the bottom of the mounting groove 351. The inclination angle and surface smoothness of the two inclined surfaces 352 are consistent to ensure that the two rolling elements 361 can accurately abut against the corresponding inclined surfaces 352.

[0062] Two limiting elastic elements 362 are respectively installed between the side walls on both sides of the mounting groove 351 and the corresponding rolling elements 361. The two limiting elastic elements 362 simultaneously apply an elastic driving force to their respective corresponding rolling elements 361 in the direction of the drive column 341, pushing the two rolling elements 361 to move along the corresponding inclined surface 352 toward the drive column 341. Since the two limiting components are symmetrically arranged, the two rolling elements 361 exert equal forces on the driven plate 35 when they are clamped.

[0063] In the locked state, the two rolling elements 361, driven by the limiting elastic element 362, form tight contact with the corresponding inclined surface 352 and the inner wall of the limiting ring 33, respectively. Due to the symmetrical arrangement of the two rolling elements 361, they form a bidirectional rigid limit on the drive column 341, thereby restricting the rotation of the driven disk 35 relative to the limiting ring 33 through the cooperation between the drive column 341 and the mounting groove 351, ultimately achieving the locking of the rotating shaft 31.

[0064] When the drive disk 34 rotates clockwise, the rolling element 361 on the clockwise side of the drive column 341 moves toward the second end of the corresponding inclined surface 352, and the corresponding limiting elastic element 362 is compressed, thus releasing the clockwise rolling element 361 from the clamped state. The drive column 341 applies a clockwise force to the driven disk 35, causing the driven disk 35 to tend to rotate clockwise. Since the two inclined surfaces 352 are mirror symmetrical, the rolling element 361 on the counterclockwise side of the drive column 341 moves toward the second end of the corresponding inclined surface 352, so that the rolling element 361 does not restrict the rotation of the driven disk 35. That is, the rolling elements 361 on both sides of the drive column 341 are released from the clamped state, allowing the drive disk 34 to drive the driven disk 35 and the rotating shaft 31 to rotate.

[0065] When the drive disk 34 rotates counterclockwise, the rolling element 361 on the counterclockwise side of the drive column 341 moves toward the second end of the corresponding inclined surface 352, and the corresponding limiting elastic element 362 is compressed, thus releasing the counterclockwise rolling element 361 from the clamped state. The drive column 341 applies a counterclockwise force to the driven disk 35, causing the driven disk 35 to tend to rotate counterclockwise. Since the two inclined surfaces 352 are mirror symmetrical, the rolling element 361 on the clockwise side of the drive column 341 is equivalent to moving toward the second end of the corresponding inclined surface 352, so that the rolling element 361 does not restrict the rotation of the driven disk 35. That is, the rolling elements 361 on both sides of the drive column 341 are released from the clamped state, allowing the drive disk 34 to drive the driven disk 35 and the rotating shaft 31 to rotate.

[0066] When the drive disc 34 rotates, the rolling elements 361 on both sides of the drive column 341 move towards the second end of the corresponding inclined surface 352, causing the two rolling elements 361 to disengage from the limiting ring 33 at the same time, and the two limiting elastic elements 362 are compressed.

[0067] After the driving force is stopped, the two limiting elastic members 362 respectively push the two rolling members 361 to move toward the first end of the corresponding inclined surface 352, so that the two rolling members 361 return to the state of being clamped by the inclined surface 352 and the inner wall of the limiting ring 33, and re-form bidirectional abutment lock to ensure the stability of the traction position.

[0068] In other embodiments, a clutch locking mechanism is provided on the rotating shaft 31. The clutch locking mechanism may include a ratchet and a pawl. The pawl is provided on the traction seat 1. Normally, the traction direction of the traction seat 1 is fixed when traction is applied, that is, the traction seat 1 moves towards the part of the base shaft 2 that is connected to the base component. When the ratchet is set to rotate in a set direction, the pawl can move relative to the ratchet, so that the traction seat 1 moves in the traction direction. When the rotating shaft 31 is stopped, since the traction force of the patient's limb on the traction seat 1 is opposite to the traction direction, the traction seat 1 has a tendency to move in the opposite direction of the traction direction. At this time, the pawl engages with the ratchet to keep the position of the traction seat 1 stable.

[0069] In some embodiments, there are multiple mounting slots 351, multiple drive posts 341 are provided on the drive disk 34, and multiple sets of limiting components 36 are provided; multiple mounting slots 351 are arranged circumferentially on the driven disk 35 along the rotating shaft 31, multiple drive posts 341 are correspondingly arranged in multiple mounting slots 351, and a limiting component 36 is installed in each mounting slot 351.

[0070] This configuration, with multiple mounting slots 351 evenly arranged circumferentially and each slot 351 containing a limiting component 36, achieves multi-point coordinated locking of the clutch locking mechanism. This significantly improves locking reliability and the device's fault tolerance; even if a limiting component in one mounting slot 351 fails, the clutch locking mechanism can still guarantee its locking function. Simultaneously, the synchronous unlocking and locking of multiple sets of limiting components 36 makes operation smoother, avoiding potential jamming issues caused by a single component. Furthermore, the structure of multiple mounting slots 351 and multiple limiting components 36 does not increase the size of the clutch locking mechanism, allowing the limb traction device to remain compact.

[0071] Specifically, the driven plate 35 has a circular disc-shaped structure, and multiple mounting slots 351 are evenly spaced along the circumference of the rotating shaft 31. The number of mounting slots 351 can be three or six, or the driven plate 35 can have three to six mounting slots 351. The structure of each mounting slot 351 is completely identical, all including an inclined surface 352 facing the inner wall of the limiting ring 33. The inclination angle and size of the inclined surface 352 are the same, ensuring that the force state of each limiting component 36 is consistent. The circumferential spacing of the multiple mounting slots 351 is uniform, so that the distance from each mounting slot 351 to the center of the rotating shaft 31 is equal, forming a symmetrical distribution structure.

[0072] The number of limiting components 36 can be chosen to be the same as the number of mounting slots 351, with one set of limiting components 36 installed in each mounting slot 351. Alternatively, the number of limiting components 36 can be twice the number of mounting slots 351, allowing two limiting components 36 to be installed in one mounting slot 351.

[0073] Multiple drive posts 341 on the drive disk 34 are evenly arranged circumferentially and correspond one-to-one with multiple mounting slots 351 on the driven disk 35. Each drive post 341 extends into the corresponding mounting slot 351 and has a reserved space for movement with the inner wall of the mounting slot 351, so as to ensure that the drive disk 34 can push the rolling element 361 to move through the drive post 341 when it rotates.

[0074] In some embodiments, the limiting component further includes a telescopic column arranged circumferentially along the rotating shaft 31. One end of the telescopic column is connected to the inner wall of the mounting groove 351, and the other end abuts against the rolling element 361. The limiting elastic element 362 is disposed on the telescopic column, and the telescopic column extends and retracts synchronously with the deformation of the limiting elastic element 362.

[0075] With this configuration, the telescopic column guides the deformation of the limiting elastic element 362, preventing deflection or displacement of the limiting elastic element 362 during deformation. The telescopic column's own extension and retraction can adapt to the deformation of the limiting elastic element 362, preventing the telescopic column from affecting the movement of the rolling element 361.

[0076] The telescopic column can be selected as multiple hollow cylinders that are sequentially and movably connected. The telescopic column can be extended or retracted by the relative movement of the multiple cylinders. The mounting groove 351 can be provided with mounting holes on the side wall along the circumference of the rotating shaft 31. One end of the telescopic column is inserted into the mounting hole, and the other end abuts against the rolling element 361.

[0077] The limiting elastic element 362 can be installed in the internal space of the telescopic column, so that the end of the telescopic column away from the side wall of the mounting groove 351 abuts against the rolling element 361. Alternatively, the limiting elastic element 362 can be sleeved on the outside of the telescopic column, and the end of the limiting elastic element 362 away from the side wall of the mounting groove 351 is connected to the outer wall surface of the telescopic column, so that the limiting elastic element 362 drives the end of the telescopic column to abut against the rolling element 361.

[0078] Reference Figure 3 As shown, in some embodiments, the drive disk 34 is disposed on the side of the driven disk 35 away from the drive gear 32, and the end of the rotating shaft 31 is rotatably connected to the traction knob 37, which is fixedly connected to the drive disk 34.

[0079] This design allows medical staff to manually rotate the traction knob 37 to turn the drive disc 34. The manual drive eliminates the need for additional motors or other power equipment, simplifying the overall structure of the device, reducing equipment costs and the risk of failure. It also allows medical staff to adjust the traction speed and stroke in real time according to surgical needs, improving operational flexibility and precision.

[0080] Specifically, the traction knob 37 has a disc structure, and its outer circumferential surface has multiple spaced grooves, forming an anti-slip texture to facilitate the operator's grip and rotation. The traction knob 37 can be rotatably connected to the shaft 31 via a bearing, or it can have a through hole with a diameter larger than the shaft 31, with the shaft 31 fitting within the through hole with a clearance fit.

[0081] The traction knob 37 is located at the end of the rotating shaft 31 and is positioned opposite to the drive disk 34. The traction knob 37 and the drive disk 34 can be connected by multiple bolts, or the traction knob 37 and the rotating shaft 31 can be connected by welding. As long as rotating the traction knob 37 can drive the drive disk 34 to rotate synchronously, it is acceptable.

[0082] Reference Figure 3 As shown, in some embodiments, there are two clutch locking mechanisms. The two clutch locking mechanisms are respectively located on opposite sides of the traction seat 1 and are both connected to the rotating shaft 31. The drive ends of the two clutch locking mechanisms are respectively exposed on opposite sides of the traction seat 1.

[0083] This configuration, with its symmetrical arrangement of the dual-clutch locking mechanism, creates two locking points on the rotating shaft 31, enhancing the stability of the lock and enabling the traction seat 1 to withstand greater reverse traction force, thus adapting to more complex traction surgery requirements. Simultaneously, the synchronized operation of the dual-clutch locking mechanism ensures uniform transmission of driving force, reduces eccentric wear on the rotating shaft, and extends the service life of the device.

[0084] Both limiting rings 33 are annular structures with identical structural dimensions. They are respectively set on opposite sides of the traction seat 1, and the two limiting rings 33 are coaxial. The rotating hole 12 passes through the traction seat 1, so that the axis of the rotating hole 12 coincides with the axis of the two limiting rings 33.

[0085] The rotating shaft 31 is still a cylindrical rigid shaft, which is rotatably connected to the rotating hole 12 of the traction seat 1 through the bearing. The rotating shaft 31 passes through the rotating hole 12, so that both ends of the rotating shaft 31 extend to the outside of the traction seat 1. Two clutch locking mechanisms are respectively located on both sides of the traction seat 1 along the axial direction of the rotating shaft 31, so that both clutch locking mechanisms are installed on the rotating shaft 31.

[0086] Two clutch locking mechanisms engage with two limit rings 33, with the two drive ends exposed on both sides of the traction seat 1. When a limit component 36 is provided in the mounting groove 351 of the clutch locking mechanism, the driven discs 35 of the two clutch locking mechanisms are mirror-symmetrical about the traction seat 1 along the axial direction of the rotating shaft 31. Rotating one drive disc 34 in the direction that the first end of the corresponding driven disc 35 faces the second end unlocks the clutch locking mechanism and applies a driving force to the rotating shaft 31. The driving force on the rotating shaft 31 causes the driven disc 35 of the other clutch locking mechanism to rotate in the same direction. Because the two driven discs 35 are mirror-symmetrical, when the driven disc 35 rotates, the rolling element 361 moves towards the first end, and the other clutch locking mechanism remains locked. The operator must simultaneously rotate both drive discs 34 relative to the traction seat 1 with both hands to make the two driven discs 35 drive the rotating shaft 31 to rotate.

[0087] Of course, one driven disk 35 can also be reversed 180° and overlapped with another driven disk 35. That is, in one direction around the circumference of the rotating shaft 31, the first end of the inclined surface 352 of one driven disk 35 is upstream of the second end, and the second end of the inclined surface 352 of the other driven disk 35 is downstream of the second end. At this time, the drive disk 34 in one clutch locking mechanism rotates, causing the rolling element 361 to move toward the second end of the corresponding inclined surface 352 to complete the unlocking. The rotating shaft 31 receives the driving force, and the driving force on the rotating shaft 31 is transmitted to the driven disk 35 in the other clutch locking mechanism, so that the driven disk 35 has a rotational tendency relative to the corresponding drive disk 34. This rotational tendency of the driven disk 35 relative to the drive disk 34 can cause the rolling element 361 to move toward the second end of the corresponding inclined surface 352, thereby completing the unlocking. That is, when the operator drives the drive disk 34 of one clutch locking mechanism to rotate to complete the unlocking, the other clutch locking mechanism can also complete the unlocking.

[0088] When the mounting slot 351 of the clutch locking mechanism is provided with two limiting components 36, the drive disk 34 can be rotated in either direction to complete the unlocking. At this time, after one of the two clutch locking mechanisms is unlocked, the driving force will be transmitted to the rotating shaft 31. The rotating shaft 31 applies a force to the driven disk 35 in the other clutch locking mechanism, so that the driven disk 35 has a tendency to rotate relative to the corresponding drive disk 34, which is equivalent to the drive disk 34 rotating relative to the driven disk 35 to complete the unlocking. Therefore, rotating one drive disk 34 can unlock both clutch locking mechanisms.

[0089] Reference Figure 3 and Figure 14 As shown, in some embodiments, the limb traction device further includes an unlocking part 41 and a first reset elastic member 42. The unlocking part 41 is rotatably connected to the traction seat 1 via a pin 43, allowing the unlocking part 41 to move between a locked position and an unlocked position around the pin 43. The two ends of the first reset elastic member 42 are respectively connected to the traction seat 1 and the unlocking part 41 to drive the unlocking part 41 to move toward the locked position. A limiting ring 33 is rotatably connected to the traction seat 1. When the unlocking part 41 is in the locked position, it engages with the limiting ring 33 to limit the rotation of the limiting ring 33 relative to the traction seat 1. When the unlocking part 41 is in the unlocked position, it disengages from the limiting ring 33, allowing the limiting ring 33 to rotate relative to the traction seat 1.

[0090] With this configuration, when the unlocking part 41 is in the unlocked position, the limiting ring 33 and the clutch locking mechanism can rotate together relative to the traction seat 1, allowing the rotating shaft 31 to rotate freely. At this time, applying a force along the axial direction of the base shaft 2 to the traction seat 1 allows it to slide freely along the base shaft 2, facilitating quick adjustment of the position of the traction seat 1 when no traction is applied. The first reset elastic element 42 ensures that the unlocking part 41 is in the locked position when there is no external force, preventing accidental locking from affecting normal operation.

[0091] Specifically, the unlocking part 41 is a rigid structure in the shape of a rod or a plate, which is rotatably connected to the side wall of the traction seat 1 by a pin or hinge. The axis of rotation of the unlocking part 41 is parallel to the axis of the limiting ring 33, ensuring that the unlocking part 41 can rotate flexibly between the locked position and the unlocked position around the rotation axis.

[0092] The side of the traction seat 1 can be provided with a groove, and the bottom of the groove is provided with an opening. The limiting ring 33 is rotatably disposed in the groove. The unlocking part 41 is rotatably connected to the traction seat 1 through the pin 43. The pin 43 is parallel to the axis of the limiting ring 33. The unlocking part 41 is located on the bottom side of the traction seat 1. When the unlocking part 41 is in the locked position, the unlocking part 41 is attached to the bottom side of the traction seat 1, so that the unlocking part 41 is limited and engaged with the limiting ring 33 through the opening.

[0093] Alternatively, the pin 43 of the unlocking part 41 can be perpendicular to the axis of the limiting ring 33. The end of the unlocking part 41 away from the traction seat 1 is used to engage with the limiting ring 33 for limiting. The unlocking part 41 can rotate toward the traction seat 1 to move to the locked position, or rotate away from the traction seat 1 to move to the unlocked position.

[0094] The limiting ring 33 can be rotatably connected to the traction seat 1 via a bearing, or the side of the traction seat 1 is provided with a circular groove, and a part of the outer wall surface of the limiting ring 33 is smooth, so that the smooth outer wall surface of the limiting ring 33 is located in the circular groove and abuts against the inner wall of the circular groove, thereby allowing the limiting ring 33 to rotate in the circular groove.

[0095] The first reset elastic element 42 can be a compression spring, with one end connected to the outer wall of the traction seat 1 and the other end connected to the unlocking part 41. Alternatively, the first reset elastic element 42 can be a torsion spring, with a connecting window on the rotating hole 12. The torsion spring is sleeved on the rotating shaft 31, and a crossbar is formed in the middle of the torsion spring. The two ends of the torsion spring are located on two opposite inner wall surfaces of the connecting window. The crossbar extends through the connecting window to the outside of the traction seat 1, and a hook is provided on the unlocking part 41, which hooks into the crossbar.

[0096] When the unlocking part 41 is in the locked position, the first reset elastic member 42 is in a compressed or stretched elastic deformation state, and the elastic force of the first reset elastic member 42 keeps the unlocking part 41 stably in the locked position; when the unlocking part 41 moves to the unlocking position, the elastic deformation of the first reset elastic member 42 increases, and the elastic force of the first reset elastic member 42 drives the unlocking part 41 to reset to the locked position.

[0097] Furthermore, the outer wall surface of the limiting ring 33 is provided with a continuous tooth structure 331, and the unlocking part 41 is provided with a positioning tooth 411 that matches the tooth structure 331; when the unlocking part 41 is in the locked position, the positioning tooth 411 engages with the tooth structure 331, and when the unlocking part 41 is in the unlocked position, the positioning tooth 411 disengages from the tooth structure 331.

[0098] This design, through the meshing of the tooth structure 331 and the positioning tooth 411, makes the limiting engagement between the unlocking part and the limiting ring more precise and stable, with higher limiting strength of the tooth meshing, effectively withstanding greater reverse traction force. The continuous tooth structure 331 design ensures that the limiting ring 33 can lock with the unlocking part 41 at any angle, improving the convenience of operation and the accuracy of positioning.

[0099] Specifically, the limiting ring 33 is an annular structure with a continuous tooth structure 331 integrally formed on its outer wall. The tooth structure 331 consists of circumferentially evenly distributed gear teeth with involute or rectangular tooth profiles. The tooth pitch is precisely designed to ensure that it can accurately mesh with the positioning teeth 411 of the unlocking part 41. The circumferential length of the tooth structure 331 covers the entire outer circumferential surface of the limiting ring 33, ensuring that the unlocking part 41 can mesh with it at any angle.

[0100] The unlocking part 41 has a positioning tooth 411 on the side facing the limiting ring 33. The tooth shape and tooth pitch of the positioning tooth 411 are perfectly matched with the tooth structure 331 of the limiting ring 33. The end of the unlocking part 41 away from its rotation axis has a protruding handle or lever, which makes it easy to push the unlocking part 41 to rotate.

[0101] When the unlocking part 41 is in the locked position, the positioning tooth 411 engages with the tooth structure 331, and the limiting ring 33 cannot rotate relative to the traction seat 1. At this time, the operator can precisely control the position of the traction seat 1 by controlling the clutch locking mechanism to switch between the locked and unlocked states, and by rotating the shaft 31. When the unlocking part 41 is in the unlocked position, the limiting ring 33 can rotate relative to the traction seat 1. The locking of the clutch locking mechanism and the limiting ring 33 can not restrict the rotation of the shaft 31 relative to the traction seat 1. At this time, pushing the traction seat 1 will allow the traction seat 1 to slide freely along the base shaft 2.

[0102] Reference Figure 2 and Figures 9 to 12 As shown, in some embodiments, the base shaft 2 includes a fixed shaft 22, an end cap 23, a sleeve portion, and a first spring 26; one end of the fixed shaft 22 is an installation end for connecting the base component, and a limiting fit portion 221 is protruding from the outer circumferential surface of the fixed shaft 22; the end cap 23 is movably sleeved on the fixed shaft 22 and is located on the side of the limiting fit portion 221 facing the installation end; the first spring 26 is sleeved on the fixed shaft 22, and its two ends abut against the end cap 23 and the limiting fit portion 221 respectively; the sleeve portion is sleeved on the outside of the fixed shaft 22 and the first spring 26, and the sleeve portion is circumferentially limited to the fixed shaft 22, and can slide relative to the fixed shaft 22 along the axial direction of the fixed shaft 22; the sleeve portion is fixedly connected to the end cap 23, and a rack 21 is disposed on the outer wall surface of the sleeve portion; when the distance between the traction seat 1 and the end cap 23 gradually decreases, the first spring 26 is compressed, causing the elastic force to gradually increase.

[0103] With this configuration, the base shaft 2 adopts a separate structure of fixed shaft 22 and sleeve part, and a first spring 26 is added so that the first spring 26 provides traction force to the traction seat 1. During the traction process, the traction is mainly completed by the movement of the sleeve part relative to the fixed end, and the position of the traction seat 1 relative to the fixed end remains basically stable, so as to adjust the magnitude of the traction force on the limb without changing the position of the limb.

[0104] Specifically, the fixed shaft 22 is a long, rigid shaft, with one end serving as the mounting end for fixed connection to base components such as the operating table. The fixed shaft 22 acts as the load-bearing foundation for the entire base shaft 2, providing stable support. A limiting fitting part 221 is provided in the middle of the fixed shaft 22. The limiting fitting part 221 can be an annular protrusion serving as a shoulder. The first spring 26 is a compression spring, sleeved on the fixed shaft 22, with one end abutting against the inner end face of the end cap 23 and the other end abutting against the shoulder of the fixed shaft 22 facing the end cap 23. Alternatively, the limiting fitting part 221 can be multiple pins located in the middle of the fixed shaft 22, spaced circumferentially along the fixed shaft 22. One end of the first spring 26 abuts against the side of the end cap 23 facing the limiting fitting part 221, and the other end abuts against the limiting fitting part 221.

[0105] The end cap 23 has a disc-shaped structure with a through hole in the center that matches the outer diameter of the fixed shaft 22. It is movably fitted onto the fixed shaft 22 with a clearance fit, allowing the end cap 23 to slide freely along the axial direction of the fixed shaft 22. The end cap 23 is located on the side of the traction seat 1 near the mounting end. Normally, during traction, the traction seat 1 moves towards the mounting end to apply traction force to the limb, with the traction force applied to the limb directed towards the mounting end.

[0106] The sleeve portion is a hollow cylindrical structure, with its inner diameter adapted to the outer diameter of the fixed shaft 22 and the first spring 26, and is sleeved on the outside of the fixed shaft 22 and the first spring 26. The sleeve portion and the fixed shaft 22 are connected circumferentially by a key or spline to achieve a limiting fit, ensuring that the sleeve portion cannot rotate circumferentially relative to the fixed shaft 22, but can slide freely axially relative to the fixed shaft 22. For example, the fixed shaft 22 has a first keyway extending axially, and the sleeve portion has a through groove. The key is inserted into the through groove and the first keyway 222. The key is limited to fit with the first keyway 222 circumferentially along the fixed shaft 22, and can slide relative to the first keyway 222 axially along the fixed shaft 22.

[0107] The rotating shaft 31 drives the traction seat 1 to move relative to the sleeve portion toward the mounting end. Since the sleeve portion can slide along the fixed shaft 22, it means that the sleeve portion moves away from the mounting end. At this time, the distance between the traction seat 1 and the end cover 23 decreases, and the first spring 26 is gradually compressed, so that the elastic force of the first spring 26 gradually increases. The elastic force of the first spring 26 applied to the sleeve is opposite to the direction of the required traction force. The reaction force applied by the sleeve portion to the traction seat 1 is in the same direction as the required traction force, that is, the elastic force of the first spring 26 provides the traction force of the traction seat 1.

[0108] When the traction seat 1 is not applying traction, the first spring 26 is not compressed or deformed. After the traction seat 1 begins to apply traction, the sleeve part moves away from the installation end, causing the first spring 26 to compress and apply an elastic force to the sleeve part. The elastic force on the sleeve part is transmitted to the traction seat 1 through the clutch locking mechanism, so that the traction seat 1 applies traction force to the limb.

[0109] Furthermore, the base shaft 2 also includes a second spring 27; the second spring 27 is disposed on the side of the limiting fit portion away from the end cover 23, and the two ends of the second spring 27 abut against the inner wall surface of the sleeve portion and the limiting fit portion 221 respectively; as the distance between the traction seat 1 and the end cover 23 gradually decreases, the elastic force of the second spring 27 gradually decreases; the outer side of the sleeve portion is provided with an identification window 240 communicating with the interior of the sleeve portion, and part of the fixed shaft 22 is exposed in the identification window 240; the outer side of the sleeve portion is provided with an identification portion 241, which is located at the edge of the identification window 240. The identification portion 241 marks the relative movement distance between the fixed shaft 22 and the sleeve portion along the axial direction of the fixed shaft 22 to correspondingly display the traction force provided by the traction seat 1.

[0110] With this configuration, by providing a marking section 241 on the sleeve, medical personnel can directly determine the traction force of the limb traction device on the limb in the current state based on the marking section 241. The second spring 27, together with the first spring 26, forms a synergistic buffering effect, making the buffering force of the base shaft 2 more stable and preventing excessive compression of the first spring 26.

[0111] Specifically, an opening may be provided on the side wall of the sleeve as an identification window 240. The identification window 240 is connected to the internal space of the sleeve, so that part of the fixed shaft 22 is exposed in the identification window 240. When the sleeve moves relative to the fixed shaft 22, the fixed shaft 22 moves in the identification window 240, and the identification part 241 can mark the moving distance of the fixed shaft 22 through the identification window 240.

[0112] The marking section 241 can be a scale set on the outer wall of the sleeve, and the marking window 240 can be set at the end of the sleeve away from the end cover 23. The distance the end face of the fixed shaft 22 moves in the marking window 240 can be read through the scale. Alternatively, the marking section 241 can be an electronic rangefinder, which measures the distance the fixed shaft 22 moves through the marking window 240.

[0113] The second spring 27 is a compression spring, which is located on the side of the first spring 26 away from the end cover 23 and is sleeved on the outside of the fixed shaft 22.

[0114] A stepped structure is formed on the inner wall surface of the sleeve portion. One end of the second spring 27 abuts against the stepped structure on the inner wall surface of the sleeve portion, while the other end abuts against the side of the limiting fit portion 221 of the fixed shaft 22 away from the end cover 23.

[0115] In its natural state, both the first spring 26 and the second spring 27 are in a compressed state. The elastic force of the first spring 26 pushes the sleeve part to move toward the fixed end of the fixed shaft 22, and the elastic force of the second spring 27 pushes the sleeve part to move away from the fixed end of the fixed shaft 22. The elastic forces of the first spring 26 and the second spring 27 are equal in magnitude and opposite in direction.

[0116] When the traction seat 1 is being pulled, the sleeve part moves away from the mounting end; the first spring 26 is compressed, increasing the elastic force, and the compressed part of the second spring 27 is restored, decreasing the elastic force.

[0117] The elastic force exerted by the second spring 27 on the sleeve portion is directed away from the mounting end, while the elastic force exerted by the first spring 26 on the sleeve portion is directed towards the mounting end. When the clutch locking mechanism is in the locked state, the rotating shaft 31 and the traction seat 1 can be considered as rigid bodies. During traction, the force exerted by the limb on the traction seat 1 is directed away from the mounting end. Force analysis of the limb traction device shows that the sum of the traction force of the limb on the traction seat 1 and the elastic force of the second spring 27 is equal to the elastic force of the first spring 26. The formula is summarized as follows: F + F2 = F1 Where F is the traction force of the limb on the traction seat 1, F1 is the elastic force of the first spring 26, and F2 is the elastic force of the second spring 27; Based on the fact that the extension and contraction of the first spring 26 and the second spring 27 are equal to the change in length of the fixed shaft 22 outside the sleeve, and that the length changes of the first spring 26 and the second spring 27 are in opposite directions, and after simplification using Hooke's Law, we can obtain F = x (k1+k2); in x is the change in length of the fixed shaft 22 on the outside of the sleeve, k1 is the elastic coefficient of the first spring 26, and k2 is the elastic coefficient of the second spring 27.

[0118] The magnitude of the traction force provided by the traction seat 1 can be determined by measuring the distance the fixed shaft 22 moves using the above formula.

[0119] When the traction seat 1 is not in use, the fixed shaft 22 has the longest length in the marking window 240. When the traction seat 1 is in use, as the traction force increases, the length of the portion of the fixed shaft 22 outside the sleeve gradually decreases. That is, the end of the marking portion 241 away from the sleeve is the starting point of the scale line, and the scale line gradually increases in the direction closer to the sleeve.

[0120] Reference Figure 1 and Figure 15As shown, in some embodiments, the limb traction device further includes a limiting post 5; the traction seat 1 is provided with a limiting hole 14 communicating with the mounting through hole 11, and the limiting post 5 is slidably disposed in the limiting hole 14, so that the limiting post 5 can move between the limiting position and the releasing position; the sleeve part includes an inner sleeve 24 and an outer sleeve 25 both sleeved on the fixed shaft 22; the inner sleeve 24 is connected to the end cap 23 and is circumferentially limited to the fixed shaft 22, and the outer wall surface of the inner sleeve 24 is provided with a plurality of teeth 242 extending axially along the fixed shaft 22, and the plurality of teeth 242 The outer sleeve 25 is sleeved on the outside of the inner sleeve 24 and has a mating through hole 251 extending axially. The limiting post 5 passes through the mating through hole 251 to restrict the relative rotation of the outer sleeve 25 and the traction seat 1. The limiting post 5 extends out of the mating through hole 251 in the limiting position to engage with the tooth 242 to restrict the rotation of the outer sleeve 25 relative to the inner sleeve 24. The limiting post 5 retracts into the mating through hole 251 in the releasing position and disengages from the tooth 242, so that the traction seat 1 and the outer sleeve 25 can rotate synchronously relative to the inner sleeve 24.

[0121] This configuration, by adding the limiting post 5 and the teeth 242, achieves the dual functions of linear traction and angle adjustment of the traction seat 1, expanding the applicability of the limb traction device and meeting the traction needs of different surgical positions and different limb angles. The meshing of the limiting post 5 and the teeth 242 can accurately lock the angle of the traction seat 1 relative to the base shaft 2, preventing angle deviation caused by external forces during traction, and improving the stability and reliability of the traction angle.

[0122] Specifically, a limiting hole 14 is provided on the traction seat 1. The axis of the limiting hole 14 is perpendicular to the axis of the mounting through hole 11, and the limiting hole 14 is connected to the mounting through hole 11. The inner diameter of the limiting hole 14 is adapted to the outer diameter of the limiting post 5 to accommodate the limiting post 5.

[0123] The limiting post 5 is a cylindrical metal rod that is slidably disposed in the limiting hole 14, so that the limiting post 5 can move between the limiting position and the releasing position. The bottom end of the limiting post 5 may be provided with a mating tooth 51, which can mesh with the tooth 242 on the inner sleeve 24.

[0124] The sleeve portion includes an inner sleeve 24 and an outer sleeve 25, both of which are hollow cylindrical structures and are fitted onto the outside of the fixed shaft 22. One end of the inner sleeve 24 is fixedly connected to the end face of the end cap 23 facing the traction seat 1. The inner sleeve 24 may be provided with a second keyway 243. The fixed shaft 22 is provided with a sliding groove extending axially. The key is disposed in the second keyway 243 and inserted into the sliding groove. The key and the sliding groove are circumferentially limited and engaged with each other, and the key can slide along the sliding groove, so that the inner sleeve 24 can slide relative to the fixed shaft 22.

[0125] The inner sleeve 24 may have bushings 28 at both ends, the outer sleeve 25 is limited between the two bushings 28, and one bushing 28 covers the second keyway 243 to ensure that the key can be stably located in the second keyway 243.

[0126] The outer wall surface of the inner sleeve 24 is provided with multiple teeth 242, each tooth 242 extending axially along the fixed shaft 22, and the multiple teeth 242 are evenly spaced along the circumference of the inner sleeve 24. The cross-section of the teeth 242 is rectangular, triangular or trapezoidal, and the length of the teeth 242 covers the axial length of the inner sleeve 24, ensuring that it can cooperate with the limit post 5 throughout the entire sliding stroke.

[0127] The outer sleeve 25 is fitted onto the outside of the inner sleeve 24. The inner diameter of the outer sleeve 25 is larger than the outer diameter of the inner sleeve 24, allowing the outer sleeve 25 to rotate circumferentially relative to the inner sleeve 24. A rack 21 is integrally formed on the outer wall of the outer sleeve 25 for meshing with the drive gear 32 for transmission.

[0128] The outer sleeve 25 has a mating through hole 251, which extends along the axial direction of the outer sleeve 25 and the position of the mating through hole 251 corresponds to the position of the limiting hole 14 on the traction seat 1. The limiting post 5 passes through the limiting hole 14, with one end of the limiting post 5 passing through the mating through hole 251. The limiting post 5 always passes through the limiting hole 14 and the mating through hole 251, so that the limiting post 5 can restrict the relative rotation between the outer sleeve 25 and the traction seat 1, and ensure that the traction seat 1 and the outer sleeve 25 can slide synchronously.

[0129] When the limiting post 5 is in the limiting position, one end of the limiting post 5 extends out of the mating through hole 251 and meshes with the teeth 242 on the outer wall of the inner sleeve 24. Due to the circumferential limiting fit between the inner sleeve 24 and the fixed shaft 22, the rotation of the outer sleeve 25 relative to the inner sleeve 24 is restricted. At this time, the outer sleeve 25 cannot rotate relative to the inner sleeve 24. The meshing transmission of the drive gear 32 and the rack 21 drives the traction seat 1 and the outer sleeve 25 to slide along the axial direction of the inner sleeve 24, thereby realizing the linear traction function.

[0130] When the angle of the traction seat 1 needs to be adjusted, the medical staff pushes the limiting post 5 to slide along the limiting hole 14, causing the limiting post 5 to switch to the released position. At this time, the limiting post 5 retracts into the mating through hole 251, disengaging from the teeth 242 of the inner sleeve 24. The rotation restriction of the outer sleeve 25 relative to the inner sleeve 24 is released. At this time, the medical staff can rotate the traction seat 1, causing the outer sleeve 25 to rotate relative to the inner sleeve 24, thereby adjusting the angle of the traction seat 1 to meet the traction needs of different surgical positions. After adjusting to the target angle, the medical staff pushes the limiting post 5 back to the limiting position. The limiting post 5 re-engages with the teeth 242, locking the rotation angle of the outer sleeve 25 and restoring the linear traction function.

[0131] Reference Figure 1 and Figure 15 As shown, in some embodiments, the limb traction device further includes an unlocking handle 17 rotatably connected to the traction seat 1. The unlocking handle 17 is connected to the limiting post 5. The unlocking handle 17 can rotate relative to the traction seat 1 to drive the limiting post 5 to slide within the limiting hole 14, so that the limiting post 5 can switch between the release position and the limiting position.

[0132] With this design, the unlocking handle 17 transforms the linear sliding of the limit post 5 into lever rotation, reducing the operating force and facilitating the switching of the limit post 5's state, making it suitable for medical staff to operate with one hand during surgery.

[0133] Specifically, the traction seat 1 is provided with a sliding hole, which passes through the traction seat 1 in a direction perpendicular to the axis of the limiting hole 14, and the sliding hole is connected to the limiting hole 14. The sliding hole is an elongated hole that extends in the same direction as the axis of the limiting hole 14. The middle part of the limiting post 5 is provided with a through hole, and a through hole is movably inserted in the sliding hole as a pin hole 52. The pin passes through the pin hole 52, so that the pin can drive the limiting post 5 to move when it moves.

[0134] The unlocking handle 17 is a lever-type structure, comprising a rotating connecting end and an operating end. The rotating connecting end is rotatably connected to the side wall of the traction seat 1, allowing the unlocking handle 17 to rotate about a rotation axis parallel to the axis of the sliding hole. The unlocking handle 17 has a mating hole, the size of which is larger than that of the pin. The pin passes through the mating hole. When the unlocking handle 17 rotates about the rotating connecting end, the unlocking handle 17 can drive the pin to move along the axis of the limiting hole 14, thereby driving the limiting pin 5 to move along the limiting hole 14 between the limiting position and the contact position.

[0135] Furthermore, the end of the limiting post 5 away from the inner sleeve 24 is connected to a fixed cover via an auxiliary spring. The fixed cover is fixedly connected to the traction seat 1, and the auxiliary spring drives the limiting post 5 to move toward the limiting position.

[0136] With this configuration, the auxiliary spring enables the automatic reset function of the limit post, eliminating the need for medical staff to manually push the limit post to reset, making operation more convenient and improving the efficiency of angle adjustment. The continuous elastic force of the auxiliary spring makes the engagement between the limit post and the teeth more tight, and the locking state more stable, effectively preventing the limit post from loosening due to vibration or external force during traction.

[0137] Specifically, a fixing cover is fixedly installed inside the limiting hole 14 of the traction seat 1. The fixing cover has a disc-shaped structure, and its outer diameter is adapted to the inner diameter of the limiting hole 14. The fixing cover is fixed to the end of the limiting hole 14 away from the mating through hole 251 by means of threaded connection. It is used to limit the sliding stroke of the limiting post 5 and prevent the limiting post 5 from falling out of the limiting hole 14.

[0138] The auxiliary spring is a compression spring, which is disposed between the fixed cover and the limiting post 5. One end of the auxiliary spring abuts against the end face of the fixed cover facing the limiting post 5, and the other end abuts against the mounting surface 53 at the end of the limiting post 5. The mounting surface 53 can be a concave arc surface to position the auxiliary spring. The auxiliary spring is always in a compressed state and can continuously apply an elastic force to the limiting post 5 to drive the limiting post 5 to move toward the limiting position.

[0139] In its natural state, the elastic force of the auxiliary spring pushes the limiting post 5 toward the limiting position, causing one end of the limiting post 5 to extend out of the mating through hole 251 and engage with the teeth 242 of the inner sleeve 24.

[0140] When the angle of the traction seat 1 needs to be adjusted, the medical staff will pull the unlocking handle 17. The unlocking handle 17 will pull the limiting post 5 through the connecting rod, overcoming the elastic force of the auxiliary spring, so that the limiting post 5 will slide away from the mating through hole 251 and switch to the release position. At this time, the limiting post 5 will disengage from the tooth 242, and the rotation restriction of the outer sleeve 25 will be released.

[0141] After the medical staff rotates the traction seat 1 to the target angle, they release the unlocking handle 17. The elastic force of the auxiliary spring pushes the limit post 5 to automatically reset and re-engage with the teeth 242. The limit post 5 returns to the limit position and locks the angle of the traction seat 1.

[0142] Reference Figure 1 , Figure 2 and Figures 16 to 18 As shown, in some embodiments, the limb traction device further includes a traction bracket 7 and a limiting structure. The traction seat 1 is provided with an assembly groove 15, and the limiting structure is disposed in the assembly groove 15. The traction bracket 7 is plugged into the assembly groove 15. When the limiting structure is in the limiting state, it can restrict the traction bracket 7 from coming out of the assembly groove 15. When the limiting structure is in the releasing state, the traction bracket 7 can come out of the assembly groove 15.

[0143] With this configuration, the traction bracket 7 can be detachably connected and installed on the traction seat 1 through the cooperation of the assembly groove 15 and the limiting structure, so that the traction seat 1 can be equipped with traction brackets 7 suitable for different limbs, thus increasing the applicability of the limb device.

[0144] Specifically, the top surface of the traction seat 1 is provided with an assembly groove 15, which is a rectangular or circular groove structure, and its depth and width are set according to the size of the traction bracket 7.

[0145] The specific structure of the limiting structure can be selected according to actual needs, such as snap-on type or elastic pin type. Its core function is to realize the quick insertion and removal and stable fixation of the traction bracket 7.

[0146] The traction bracket 7 is a rod-shaped structure. One end of it is inserted into the mounting slot 15, and the other end is used to fix the patient's limb end. The length of the traction bracket 7 can be adjusted according to the actual traction needs to achieve traction on different parts of the limb.

[0147] Furthermore, the limiting structure includes a frame portion 61, a second reset elastic member 62, and a mounting cover 63; the traction seat 1 is provided with a sliding channel 16 and an operating hole, both of which communicate with the assembly groove 15, and the operating hole is arranged opposite to the sliding channel 16; the frame portion 61 is slidably disposed in the sliding channel 16 and partially extends into the assembly groove 15, so that the frame portion 61 can move between a snap-fit ​​position and a release position; the mounting cover 63 is fixed to the port of the sliding channel 16 away from the assembly groove 15, and the second reset elastic member 62 is connected to the frame portion 61 and the mounting cover 63. Between the covers 63, the drive frame 61 moves toward the snap-fit ​​position; the frame 61 has a button on its outer wall, which passes through the operation hole, and the button is pressed to drive the frame 61 to slide to the release position; the traction bracket 7 has a mating part 71 and a positioning part 72, with the mating part 71 disposed on the positioning part 72; when the frame 61 is in the snap-fit ​​position, the positioning part 72 is inserted into the assembly groove 15, and the mating part 71 is snapped into the frame 61; when the frame 61 is in the release position, it can disengage from the mating part 71.

[0148] This design, with its limiting structure utilizing the cooperation between the frame portion 61 and the second reset elastic element 62, allows the frame portion 61 to move between the engaged and disengaged positions simply by pressing the button. This facilitates the easy disassembly and installation of the traction bracket 7 and the traction seat 1 without the need for additional tools, significantly improving the efficiency of traction bracket installation and disassembly. The second reset elastic element 62 ensures that the frame portion 61 automatically returns to the engaged position, guaranteeing that the traction bracket 7 remains stably engaged after installation. This effectively prevents the traction bracket from detaching due to vibration or external force during traction, enhancing safety.

[0149] Specifically, a sliding channel 16 communicating with the assembly groove 15 is provided on the side wall of the traction seat 1. The cross-sectional shape of the sliding channel 16 is adapted to the cross-sectional shape of the frame part 61. The frame part 61 is slidably disposed in the sliding channel 16, so that the frame part 61 can slide back and forth between the engaging position and the disengaged position along the extension direction of the sliding channel 16.

[0150] The frame part 61 is a rectangular frame structure, with a button part at one end corresponding to the shape of the control hole. The traction seat 1 also has an operation hole that communicates with the assembly groove 15. The operation hole is opposite to the sliding channel 16 and penetrates through the outer wall of the traction seat 1. A button part is integrally formed on the outer wall of the frame part 61. The button part is a cylindrical protrusion structure that passes through the operation hole and protrudes to the outside of the traction seat 1 for easy manual operation by medical personnel.

[0151] The second reset elastic element 62 is a tension spring. One end of the spring is connected to the end of the frame portion 61 away from the button portion via a hook, and the other end is fixed to the inner wall of the sliding channel 16 via a hook. In its natural state, the second reset elastic element 62 is in a stretched state, which can continuously apply elastic tension to the frame portion 61, driving the frame portion 61 to move toward the locking position, ensuring that the frame portion 61 always remains in the locking position when no external force is applied.

[0152] A mounting cover 63 is connected to the traction seat 1, which covers the port of the sliding channel 16. The second reset elastic member 62 is a compression spring, which is connected between the mounting cover 63 and the frame part 61. When the compression spring is in a compressed state, the second reset elastic member 62 drives the frame part 61 to move toward the snap-fit ​​position.

[0153] The insertion end of the traction bracket 7 is provided with a positioning part 72 of cylindrical or block structure. A mating part 71 is fixed on the side of the positioning part 72 away from the traction bracket 7. The positioning part 72 is shaped to fit the assembly groove 15. After the positioning part 72 is inserted into the assembly groove 15, the outer wall surface of the positioning part 72 abuts against the assembly groove 15 to prevent the positioning part 72 from shaking.

[0154] The mating part 71 is a structure adapted to the frame part 61. For example, the mating part 71 is a snap-fit ​​connector, and the frame part 61 has a snap-fit ​​groove. When the frame part 61 is in the released position, the snap-fit ​​connector can be located at the frame part 61. When the frame part 61 returns to the snap-fit ​​position, the snap-fit ​​connector can be snapped into the snap-fit ​​groove. Alternatively, the mating part 71 can be a block with a snap-fit ​​groove on its side and a through hole in the middle of the frame part 61. The inner wall of the through hole has a protrusion. When the frame part 61 is in the released position, the through hole and the mating part 71 are opposite each other, so that the mating part 71 can be inserted into the through hole. After the frame part 61 returns to the snap-fit ​​position, the protrusion can be inserted into the snap-fit ​​groove to restrict the position of the traction bracket 7.

[0155] Furthermore, the mating part 71 includes a connector 711 fixed to the positioning part 72 and a limiting head 712 fixed to the end of the connector 711; the radial dimension of the limiting head 712 is larger than that of the connector 711, and the frame part 61 is provided with an assembly through hole 611 in the middle; when the frame part 61 is in the released position, the assembly through hole 611 is located at the set position opposite to the connector 711, so that the limiting head 712 can pass through the assembly through hole 611; when the frame part 61 is in the snap-fit ​​position, the assembly through hole 611 deviates from the set position, so that the limiting head 712 is blocked on the side of the frame part 61 facing away from the groove of the assembly groove 15, so as to restrict the traction bracket 7 from disengaging from the traction seat 1.

[0156] With this configuration, the mating part 71 adopts a stepped structure formed by the connector 711 and the limiting head 712, which forms a precise snap-fit ​​with the assembly through hole 611 of the frame part 61. Its structure is simple, which reduces the production and manufacturing cost and also reduces the probability of component failure.

[0157] Specifically, the connector 711 is a cylindrical rod, one end of which is fixedly connected to the positioning part 72, and the other end is fixedly connected to the limiting head 712. The limiting head 712 is a disc-shaped or spherical structure with a diameter larger than that of the connector 711, and the diameter of the limiting head 712 is slightly smaller than the diameter of the mounting through hole 611 on the frame part 61, ensuring that the limiting head 712 can smoothly pass through the mounting through hole 611 of the frame part 61. The mounting through hole 611 is provided in the middle of the frame part 61. The mounting through hole 611 is a circular through hole with a diameter slightly larger than that of the limiting head 712.

[0158] When the traction bracket 7 needs to be installed, the medical staff presses the button to push the frame part 61 to slide along the sliding channel 16 to the unlocked position. At this time, the mounting through hole 611 on the frame part 61 moves to the set position facing the groove of the mounting slot 15, and the axis of the mounting through hole 611 coincides with the axis of the mounting slot 15. The medical staff inserts the positioning part 72 of the traction bracket 7 into the mounting slot 15, and the limiting head 712 can pass smoothly through the mounting through hole 611 of the frame part 61.

[0159] Subsequently, the medical staff released the button, and the elastic force of the second reset elastic element 62 pulled the frame part 61 back to the snap-fit ​​position. At this time, the assembly through hole 611 of the frame part 61 deviated from the set position, and the edge of the assembly through hole 611 moved to the side of the limiting head 712 facing away from the groove of the assembly groove 15. Since the diameter of the limiting head 712 is larger than the diameter of the connector 711, the inner frame edge of the frame part 61 will abut against the end face of the limiting head 712, thereby restricting the limiting head 712 in the assembly groove 15 and preventing the traction bracket 7 from coming out along the axial direction of the assembly groove 15, thus achieving stable snap-fit ​​of the traction bracket 7.

[0160] When it is necessary to disassemble the traction bracket 7, the medical staff press the button again to push the frame part 61 to slide to the unlock position, so that the assembly through hole 611 is re-aligned with the set position. At this time, the limit head 712 can pass smoothly through the assembly through hole 611, and the medical staff can directly pull the traction bracket 7 out of the assembly slot 15 to complete the disassembly operation.

[0161] Furthermore, a positioning protrusion 151 is provided on one of the outer peripheral surface of the positioning part 72 and the inner wall of the assembly groove 15, and a positioning groove 721 is provided on the other. When the positioning part 72 is inserted into the assembly groove 15, the positioning protrusion 151 and the positioning groove 721 are engaged to restrict the traction bracket 7 from rotating relative to the traction seat 1.

[0162] This design, through the interlocking of the positioning protrusion 151 and the positioning groove 721, restricts the rotation of the traction bracket 7 relative to the traction seat 1, ensuring that the traction bracket 7 maintains the preset traction angle during traction, avoiding traction direction deviation caused by the rotation of the traction bracket, and improving traction accuracy. The cooperation between the positioning part and the assembly groove increases the contact area between the traction bracket and the traction seat, making the force on the traction bracket more uniform, reducing local stress concentration, and extending the service life of the traction bracket and the traction seat.

[0163] Specifically, a positioning groove 721 is integrally formed on the outer peripheral surface of the positioning part 72. The positioning groove 721 is a rectangular groove structure that extends along the axial direction of the positioning part 72. The number of positioning grooves 721 can be multiple according to actual needs, and the multiple positioning grooves 721 are evenly distributed along the circumference of the positioning part 72.

[0164] Correspondingly, a positioning protrusion 151 is integrally formed on the inner wall of the assembly groove 15. The positioning protrusion 151 is a rectangular protrusion structure, and its number corresponds one-to-one with the number of positioning grooves 721. The cross-sectional shape of the positioning protrusion 151 matches the cross-sectional shape of the positioning groove 721, ensuring that the positioning protrusion 151 can be accurately embedded in the positioning groove 721. Alternatively, the positioning protrusion 151 can be formed on the outer peripheral surface of the positioning part 72, and the positioning groove 721 can be formed on the side wall of the assembly groove 15. When the positioning part 72 is inserted into the groove of the assembly groove 15 along the axis of the assembly groove 15, the positioning protrusion 151 can be simultaneously inserted into the positioning groove 721.

[0165] When installing the traction bracket 7, medical staff first press the button to switch the frame 61 to the unlocked position, then align the positioning part 72 of the traction bracket 7 with the assembly groove 15, so that the positioning groove 721 on the positioning part 72 is aligned with the positioning protrusion 151 on the inner wall of the assembly groove 15. Then, the positioning part 72 and the mating part 71 are inserted into the assembly groove 15 together. At this time, the positioning protrusion 151 will be embedded in the positioning groove 721 to form a circumferential limiting fit.

[0166] After the mating part 71 is fully inserted into the assembly groove 15, the button part is released, and the frame part 61 returns to the snap-fit ​​position, confining the mating part 71 within the assembly groove 15, thus completing the installation of the traction bracket 7. During the traction process, due to the circumferential limiting engagement between the positioning protrusion 151 and the positioning groove 721, the traction bracket 7 cannot rotate circumferentially relative to the traction seat 1, ensuring that the traction bracket 7 always maintains the set traction angle.

[0167] When it is necessary to disassemble the traction bracket 7, press the button to switch the frame part 61 to the unlock position, and pull out the traction bracket 7 directly. At this time, the positioning protrusion 151 will disengage from the positioning groove 721, releasing the circumferential limiting fit.

[0168] Reference Figure 1and Figure 19 As shown, in some embodiments, a connector 8 is installed at the end of the fixed shaft 22, the connector 8 being used to connect to the base component.

[0169] The connector 8 can optionally include a base and a main body. The main body is fixed to the base and has a through hole. The base shaft 2 or the fixed shaft 22 passes through the through hole and is then fixed to the main body using bolts. The base is used to connect with the base component. The base can optionally have a groove with a snap-fit ​​structure inside. The base also has an unlock button, which is connected to the snap-fit ​​structure. The base component has a snap-fit ​​protrusion. After the snap-fit ​​protrusion is inserted into the groove, it snaps into the snap-fit ​​structure. The operator can press the unlock button to disengage the snap-fit ​​protrusion from the snap-fit ​​mechanism, facilitating the assembly and disassembly of the connector 8 from the base component.

[0170] The base component can be an operating table, or it can be a robotic arm mounted on an operating table or a solid bed. The robotic arm can be a six-axis robotic arm, which allows for convenient adjustment of the spatial position of the limb traction device.

[0171] In practical use, the limb traction device provided in this embodiment connects the connector 8 to the base component, the limiting post 5 is in the limiting position, and the first spring 26 and the second spring 27 are in a balanced state. The positioning part 72 of the traction bracket 7 is inserted into the mounting groove 15, the button is pressed to make the frame part 61 be in the released position, so that the limiting head 712 passes through the mounting through hole 611, and then the button is released to make the frame part 61 return to the snap-fit ​​position, so that the traction bracket 7 is installed on the traction seat 1.

[0172] First, rotate the unlocking part 41 to the unlocked position. Then, pull the traction seat 1 to adjust its position on the outer sleeve 25, positioning it at the limb requiring traction. After adjusting the position of the traction seat 1, release the unlocking part 41 to return it to the locked position, ensuring the traction seat 1 remains stable. Next, pull the unlocking handle 17 to release the limiting post 5, driving the traction seat 1 and outer sleeve 25 to rotate relative to the inner sleeve 24. This adjusts the angle of the traction seat 1, allowing the traction bracket 7 to fit the limb requiring traction. After adjusting the angle, release the unlocking handle 17. The limiting post 5, driven by the auxiliary spring, returns to the limiting position, engaging with the teeth 242 of the inner sleeve 24.

[0173] The traction bracket 7 is fixedly connected to the limb requiring traction. The traction knob 37 is rotated, causing the drive disc 34 to rotate. This causes the drive column 341 to push a rolling element 361 within the mounting groove 351, releasing the clamping and limiting effect on the two rolling elements 361 within the mounting groove 351. The driven disc 35 rotates together with the drive disc 34. The rotation of the driven disc 35 drives the rotating shaft 31 to rotate, causing the drive gear 32 to engage with the rack 21, driving the outer sleeve 25 and inner sleeve 24 to move relative to the fixed shaft 22. Both the outer sleeve 25 and inner sleeve 24 move away from the connecting member 8, increasing the elastic force of the first spring 26 and decreasing the elastic force of the second spring 27. This allows the first spring 26 to provide traction force to the traction seat 1. The operator determines the current traction force based on the indicator 241 and fine-tunes the traction force by rotating the traction knob 37 as needed.

[0174] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0175] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A limb traction device, characterized in that, include: The traction seat (1) is used to fix the patient's limbs and is provided with an installation through hole (11) and a rotating hole (12). The rotating hole (12) is spaced apart from the installation through hole (11) and communicates with it through an installation window (13). The base shaft (2) is used to connect the base component, passes through the mounting hole (11), and is provided with a rack (21) extending axially along the base shaft (2). The drive mechanism (3) includes a rotating shaft (31) rotatably connected in the rotating hole (12), a drive gear (32) fixed on the rotating shaft (31), and a clutch locking mechanism provided on the rotating shaft (31); The drive gear (32) is located in the rotating hole (12) and meshes with the rack (21) through the mounting window (13); The clutch locking mechanism cooperates with the traction seat (1) and has a locked state and an unlocked state, as well as a drive end that receives driving force; In the locked state, the clutch locking mechanism is engaged with the traction seat (1) to limit the rotation of the shaft (31); when the drive end receives driving force, the clutch locking mechanism disengages from the traction seat (1) to switch to the unlocked state, so that the shaft (31) drives the drive gear (32) to rotate, and drives the traction seat (1) to slide along the base shaft (2).

2. The limb traction device according to claim 1, characterized in that, The clutch locking mechanism includes a limiting ring (33) disposed on the traction seat (1), a drive disc (34) movably sleeved on the rotating shaft (31), a driven disc (35) fixedly sleeved on the rotating shaft (31), and a limiting component (36). The driven disk (35) is located inside the limiting ring (33) and is provided with a mounting groove (351). The driving disk (34) is provided with a driving column (341) extending into the mounting groove (351). An inclined surface (352) is formed on the groove wall of the mounting groove (351) facing the inner wall of the limiting ring (33). The inclined surface (352) gradually moves away from the inner wall of the limiting ring (33) along the circumference of the rotating shaft (31) from the first end to the second end. The limiting component (36) includes a rolling element (361) that abuts against the inclined surface (352) and a limiting elastic element (362). The drive column (341) is located on the side of the rolling element (361) away from the second end, and the limiting elastic element (362) is disposed between the rolling element (361) and the side wall of the mounting groove (351) to drive the rolling element (361) to move toward the drive column (341). In the locked state, the rolling element (361) is clamped by the inclined surface (352) and the inner wall of the limiting ring (33) to restrict the driven disk (35) from rotating in the direction from the first end to the second end; when the driving disk (34) is driven to rotate, the rolling element (361) moves along the inclined surface (352) towards the second end to release the clamping lock on the rolling element (361), so that the driving disk (34) drives the rotating shaft (31) to rotate through the driven disk (35).

3. The limb traction device according to claim 2, characterized in that, The drive column (341) and the mounting groove (351) are spaced apart on both sides of the circumference of the rotating shaft (31), and there are two limiting components (36), which are respectively located on both sides of the drive column (341). The mounting groove (351) has two inclined surfaces (352) corresponding to the two rolling elements (361). The first ends of the two inclined surfaces (352) are located in the middle of the mounting groove (351), and the two rolling elements (361) abut against the two inclined surfaces (352). The two limiting elastic elements (362) drive the two rolling elements (361) to move toward the first end of the corresponding inclined surface (352); In the locked state, each of the rolling elements (361) abuts against the inner wall of the limiting ring (33) and the corresponding inclined surface (352) to restrict the driven disk (35) from rotating relative to the limiting ring (33); When the drive disk (34) is driven to rotate by an external force, the rolling elements (361) on both sides of the drive column (341) move toward the second end of the corresponding inclined surface (352) to release the rotation limit on the driven disk (35).

4. The limb traction device according to claim 2, characterized in that, The number of mounting slots (351) is multiple, the number of driving columns (341) is provided on the driving disk (34), and the number of limiting components (36) is multiple sets; Multiple mounting slots (351) are arranged circumferentially on the driven disk (35) along the rotating shaft (31), and multiple drive columns (341) are correspondingly arranged in the multiple mounting slots (351). Each mounting slot (351) is equipped with a limiting component (36). And / or, the limiting component further includes a telescopic column arranged circumferentially along the rotating shaft (31), one end of the telescopic column being connected to the inner wall of the mounting groove (351), and the other end abutting against the rolling element (361), the limiting elastic element (362) being disposed on the telescopic column, and the telescopic column extending and retracting synchronously with the deformation of the limiting elastic element (362).

5. The limb traction device according to claim 2, characterized in that, The drive disk (34) is located on the side of the driven disk (35) away from the drive gear (32), and the end of the rotating shaft (31) is rotatably connected to a traction knob (37), which is fixedly connected to the drive disk (34).

6. The limb traction device according to any one of claims 1 to 5, characterized in that, The number of clutch locking mechanisms is two. The two clutch locking mechanisms are respectively located on opposite sides of the traction seat (1) and are both connected to the rotating shaft (31). The driving ends of the two clutch locking mechanisms are respectively exposed on opposite sides of the traction seat (1).

7. The limb traction device according to any one of claims 2 to 5, characterized in that, It also includes an unlocking part (41) and a first reset elastic element (42). The unlocking part (41) is rotatably connected to the traction seat (1) via a pin (43), so that the unlocking part (41) can move around the pin (43) between the locked position and the unlocked position. The two ends of the first reset elastic member (42) are respectively connected to the traction seat (1) and the unlocking part (41) to drive the unlocking part (41) to move toward the locked position; The limiting ring (33) is rotatably connected to the traction seat (1); When the locking position is reached, the unlocking part (41) engages with the limiting ring (33) to limit the rotation of the limiting ring (33) relative to the traction seat (1). When the unlocking part (41) is in the unlocked position, it disengages from the limiting ring (33), allowing the limiting ring (33) to rotate relative to the traction seat (1).

8. The limb traction device according to claim 7, characterized in that, The outer wall of the limiting ring (33) is provided with a continuous tooth structure (331), and the unlocking part (41) is provided with a positioning tooth (411) that matches the tooth structure (331). When the unlocking part (41) is in the locked position, the positioning tooth (411) engages with the tooth structure (331), and when the unlocking part (41) is in the unlocked position, the positioning tooth (411) disengages from the tooth structure (331).

9. The limb traction device according to any one of claims 1 to 5, characterized in that, The base shaft (2) includes a fixed shaft (22), an end cap (23), a sleeve portion and a first spring (26). One end of the fixed shaft (22) is an installation end for connecting the base component. The outer peripheral surface of the fixed shaft (22) is provided with a limiting fit part (221). The end cap (23) is movably sleeved on the fixed shaft (22) and is located on the side of the limiting fit part (221) facing the installation end. The first spring (26) is sleeved on the fixed shaft (22), and its two ends abut against the end cap (23) and the limiting fitting part (221) respectively; The sleeve portion is sleeved on the outside of the fixed shaft (22) and the first spring (26). The sleeve portion is circumferentially limited to the fixed shaft (22) and can slide relative to the fixed shaft (22) along the axial direction of the fixed shaft (22). The sleeve portion is fixedly connected to the end cap (23), and the rack (21) is disposed on the outer wall surface of the sleeve portion; As the distance between the traction seat (1) and the end cap (23) gradually decreases, the first spring (26) is compressed, causing the elastic force to gradually increase.

10. The limb traction device according to claim 9, characterized in that, The base shaft (2) also includes a second spring (27); The second spring (27) is disposed on the side of the limiting fitting part away from the end cap (23), and the two ends of the second spring (27) abut against the inner wall surface of the sleeve part and the limiting fitting part (221) respectively; As the distance between the traction seat (1) and the end cap (23) gradually decreases, the elastic force of the second spring (27) gradually decreases. The outer side of the sleeve portion is provided with an identification window (240) that communicates with the interior of the sleeve portion, and part of the fixed shaft (22) is exposed in the identification window (240); The outer side of the sleeve is provided with a marking part (241), which is located at the edge of the marking window (240). The marking part (241) marks the relative movement distance between the fixed shaft (22) and the sleeve along the axial direction of the fixed shaft (22) to display the traction force provided by the traction seat (1).

11. The limb traction device according to claim 9, characterized in that, It also includes a limiting post (5); The traction seat (1) is provided with a limiting hole (14) communicating with the mounting through hole (11), and the limiting post (5) is slidably disposed in the limiting hole (14) so ​​that the limiting post (5) can move between the limiting position and the release position. The sleeve portion includes an inner sleeve (24) and an outer sleeve (25) both sleeved on the fixed shaft (22). The inner sleeve (24) is connected to the end cap (23) and is circumferentially limited to the fixed shaft (22). The outer wall surface of the inner sleeve (24) is provided with a plurality of teeth (242) extending axially along the fixed shaft (22), and the plurality of teeth (242) are arranged circumferentially along the fixed shaft (22). The outer sleeve (25) is fitted on the outside of the inner sleeve (24) and has a mating through hole (251) extending axially. The limiting post (5) is inserted into the mating through hole (251) to restrict the relative rotation of the outer sleeve (25) and the traction seat (1); The limiting post (5) extends out of the mating through hole (251) at the limiting position to engage with the tooth (242) to restrict the outer sleeve (25) from rotating relative to the inner sleeve (24); the limiting post (5) retracts into the mating through hole (251) at the releasing position and disengages from the tooth (242) so that the traction seat (1) and the outer sleeve (25) can rotate synchronously relative to the inner sleeve (24).

12. The limb traction device according to claim 11, characterized in that, The limb traction device also includes an unlocking handle (17) rotatably connected to the traction seat (1). The unlocking handle (17) is connected to the limiting post (5). The unlocking handle (17) can rotate relative to the traction seat (1) to drive the limiting post (5) to slide in the limiting hole (14), so that the limiting post (5) switches between the release position and the limiting position.

13. The limb traction device according to claim 12, characterized in that, The end of the limiting post (5) away from the inner sleeve (24) is connected to a fixed cover by an auxiliary spring. The fixed cover is fixedly connected to the traction seat (1). The auxiliary spring drives the limiting post (5) to move toward the limiting position.

14. The limb traction device according to any one of claims 1 to 5, characterized in that, It also includes a traction bracket (7) and a limiting structure. The traction seat (1) is provided with an assembly groove (15). The limiting structure is disposed in the assembly groove (15). The traction bracket (7) is plugged into the assembly groove (15). When the limiting structure is in the limiting state, it can restrict the traction bracket (7) from coming out of the assembly groove (15). When the limiting structure is in the releasing state, the traction bracket (7) can come out of the assembly groove (15).

15. The limb traction device according to claim 14, characterized in that, The limiting structure includes a frame part (61), a second reset elastic element (62), and a mounting cover (63). The traction seat (1) is provided with a sliding channel (16) and an operating hole that are both connected to the assembly groove (15), and the operating hole is arranged opposite to the sliding channel (16); The frame part (61) is slidably disposed in the sliding channel (16) and partially extends into the assembly groove (15), so that the frame part (61) can move between the snap-in position and the release position; The mounting cover (63) is fixed at the port of the sliding channel (16) away from the assembly groove (15), and the second reset elastic member (62) is connected between the frame part (61) and the mounting cover (63) to drive the frame part (61) to move toward the snap-fit ​​position; The frame part (61) has a button part formed on its outer wall surface. The button part passes through the operation hole. The button part is pressed to drive the frame part (61) to slide to the release position. The traction bracket (7) has a mating part (71) and a positioning part (72) formed thereon, and the mating part (71) is disposed on the positioning part (72); When the frame part (61) is in the snap-fit ​​position, the positioning part (72) is inserted into the assembly groove (15), and the mating part (71) is snapped into the frame part (61); when the frame part (61) is in the release position, it can disengage from the mating part (71).

16. The limb traction device according to claim 15, characterized in that, The mating part (71) includes a connector (711) fixed to the positioning part (72) and a limiting head (712) fixed to the end of the connector (711). The radial dimension of the limiting head (712) is larger than that of the connector (711), and the frame part (61) is provided with an assembly through hole (611) in the middle. When the frame part (61) is in the released position, the assembly through hole (611) is located in the set position opposite to the connector (711), so that the limiting head (712) can pass through the assembly through hole (611); when the frame part (61) is in the snap-fit ​​position, the assembly through hole (611) is deviated from the set position, so that the limiting head (712) is blocked on the side of the frame part (61) facing away from the groove of the assembly slot (15), so as to restrict the traction bracket (7) from disengaging from the traction seat (1).

17. The limb traction device according to claim 15, characterized in that, The outer peripheral surface of the positioning part (72) and the inner wall of the assembly groove (15) are provided with a positioning protrusion (151) and a positioning groove (721). When the positioning part (72) is inserted into the assembly groove (15), the positioning protrusion (151) is inserted into the positioning groove (721) to restrict the traction bracket (7) from rotating relative to the traction seat (1).

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