External fixator for fracture with dynamic distraction function

Abstract

The application discloses a fracture external fixator with dynamic distraction function, which comprises a first fixing member, a second fixing member, a distraction guide rail, a linear driving mechanism and a controller. The first and second fixing members are distributed along a first direction and are used for fixing two parts of a fractured bone respectively. The distraction guide rail extends along the first direction and is connected with the first fixing member. An electric holder is in sliding fit with the guide rail and can clamp or loosen the guide rail. The first fixing member, the first electric holder, the second electric holder and the second fixing member are sequentially distributed. The second fixing member is connected with the second electric holder and is used for preventing the second electric holder from moving away from the first electric holder. The linear driving mechanism is installed on the first electric holder and is in driving connection with the second electric holder. The controller is electrically connected with the two electric holders and the linear driving mechanism. During treatment, the application can avoid a treatment empty window period between fracture fixation and bone defect repair and improve the continuity of overall treatment.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a fracture external fixator with dynamic traction function. Background Technology

[0002] External fixators are orthopedic devices installed outside the body. They are connected to an external metal frame via steel pins that pass through the skin and bone to stabilize and fix the fractured bone ends. To address issues such as bone defects, bone shortening, or the need for bone transport after a fracture, it is necessary to apply distraction to the bone. This involves using an external fixator to slowly pull apart the two bone segments, stimulating the formation of new callus in the middle, thereby gradually filling the defect or lengthening the limb.

[0003] Existing external fixation techniques for fractures often incorporate elastic compression mechanisms to apply continuous, controllable axial pressure to the fracture ends, promoting close contact and accelerating the healing process of simple fractures. However, these elastic external fixators are primarily suitable for simple fractures with good alignment and no significant bone loss. When patients have bone defects, bone shortening, or require bone transport (usually secondary to severe open fractures, postoperative infection and debridement, or osteomyelitis), doctors can only fix the fracture with a conventional external fixator and then passively wait for soft tissue healing, infection control, and improvement in the patient's overall condition. This creates a treatment window between fracture fixation and bone defect repair, significantly reducing the continuity of overall treatment. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a fracture external fixator with dynamic tension function, which can avoid the treatment gap between fracture fixation and bone defect repair when treating patients with bone defects, bone shortening or bone transport after fracture, and improve the continuity of overall treatment.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An external fixator for fractures with dynamic traction function, comprising:

[0007] A first fixing element, the first fixing element being used to clamp a portion of the broken bone;

[0008] The second fixation member is distributed at intervals along a first direction with the first fixation member and the second fixation member, and the first fixation member is used to clamp another part of the broken bone.

[0009] A tension guide rail extends along a first direction and is connected to the first fixing member;

[0010] At least two electric grippers are provided, which are slidably engaged with the tension guide rail, and the gripping ends of the electric grippers are capable of clamping or releasing the tension guide rail.

[0011] The first fixing member, one of the electric clamps, the other electric clamp, and the second fixing member are distributed sequentially along a first direction, and the electric clamp closer to the first fixing member is defined as the first electric clamp, and the electric clamp closer to the second fixing member is defined as the second electric clamp. The second fixing member is connected to the second electric clamp and is used to prevent the second electric clamp from moving away from the first electric clamp.

[0012] A linear drive mechanism is mounted on the first electric gripper, and the output end of the linear drive mechanism is drivenly connected to the second electric gripper.

[0013] A controller, which is electrically connected to the first electric gripper, the second electric gripper, and the linear drive mechanism.

[0014] Furthermore, the electric clamp includes a clamping base, an inductor coil, a linear guide rail, and an iron core; the clamping base has a sleeve interface for slidably engaging with the tension guide rail; the clamping base also has a through groove extending radially along the tension guide rail and communicating with the sleeve interface; the inductor coil is mounted in the through groove and fits against the inner wall of the through groove; the linear guide rail is disposed in the through groove and extends along the extension direction of the through groove; the iron core slides with the linear guide rail and passes through the inductor coil, so that when the inductor coil is energized by the controller, the iron core is subjected to the magnetic pull of the inductor coil and moves towards the center of the inductor coil, passing through the sleeve interface, until the iron core presses against the tension guide rail.

[0015] Furthermore, each of the following is provided in two: the through slot, the inductor coil, the linear guide rail, and the iron core. The two through slots are opened on opposite horizontal sides of the clamping seat; the two inductor coils are installed in the corresponding two through slots; the two linear guide rails are provided in the corresponding two through slots; the two iron cores slide in cooperation with the two linear guide rails and can be subjected to the magnetic pull generated by the corresponding two inductor coils, thereby coordinating to clamp or release the tension guide rail.

[0016] Furthermore, the electric clamp also includes a reset elastic element, one end of which is connected to the iron core and the other end of which is connected to the clamping seat, so that when the inductor coil is energized, the reset elastic element is in a stretched state.

[0017] Furthermore, the tension guide rail is provided with two anti-slip strips, which are embedded in the horizontal opposite sides of the tension guide rail and extend along the extension direction of the tension guide rail; the clamping ends of the two iron cores are provided with two anti-slip plates, which are used to correspondingly adhere to the anti-slip strips to cooperate in clamping the tension guide rail.

[0018] Furthermore, the linear drive mechanism is a miniature electric push rod; the tension guide rail is provided with a first scale, which extends along the extension direction of the tension guide rail.

[0019] Furthermore, a limiting baffle is provided at one end of the tension guide rail away from the first fixing member, and a limiting block is slidably sleeved on the tension guide rail. The limiting block is provided with a first locking member, which is used to lock the limiting block to the tension guide rail.

[0020] Furthermore, the fracture external fixator with dynamic tension function is also provided with a first distance measuring device and a second distance measuring device. The first distance measuring device is installed on the miniature electric push rod and is used to measure the extension distance of the miniature electric push rod. The first distance measuring device is a potentiometer-type sensor. The second distance measuring device is installed on the second fixing member and is used to measure the distance that the second electric clamp is pushed by the miniature electric push rod.

[0021] Both the first rangefinder and the second rangefinder are electrically connected to the controller.

[0022] Furthermore, the fracture external fixator with dynamic traction function also includes a first indicator light and a second indicator light; the first indicator light is installed on the first electric clamp; the second indicator light is installed on the second electric clamp; both the first indicator light and the second indicator light are electrically connected to the controller and are used to display the energization status of the inductor coil in the first electric clamp and the energization status of the inductor coil in the second electric clamp, respectively.

[0023] Furthermore, the fracture external fixator with dynamic tension function also includes a pressure-adjusting elastic element, a screw, a fixing nut, a sleeve, and a second locking element; one end of the pressure-adjusting elastic element is connected to the second electric clamp, and the other end of the pressure-adjusting elastic element is rotatably connected to the screw; the screw is threadedly connected to the second fixing element, and an adjustment seat is provided at the end of the screw away from the pressure-adjusting elastic element; the fixing nut is threadedly connected to the screw to fix the screw to the second fixing element; the sleeve is fitted onto the pressure-adjusting elastic element, and the sleeve has an observation port that penetrates the wall thickness of the sleeve; the outer wall of the sleeve also has a second scale that extends along the axial direction of the sleeve; the second locking element is used to lock the sleeve and the second electric clamp together.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. Based on a tension guide rail extending along a first direction and connected to a first fixation member, and at least two electrically operated clamps, the electrically operated clamps slide in cooperation with the tension guide rail. The clamping ends of the electrically operated clamps can clamp or release the tension guide rail. Since the tension guide rail is directly connected to the first fixation member, and the two electrically operated clamps can selectively clamp or slide on the guide rail, the initial stabilization and subsequent dynamic tensioning of the fracture ends can be continuously completed on the same device without the need for midway removal or replacement of the structure, thus avoiding the fracture fixation problems encountered in traditional treatments. After completion, there is a waiting period for the bone defect repair to begin. At the same time, by alternately clamping the traction guide with two electric clamps and cooperating with the drive mechanism, a step-by-step unidirectional traction tension can be applied to the bone fragment in the first direction, realizing an automatic cycle of "fixation-traction-refixation" and avoiding treatment interruption caused by repeated disassembly and assembly. In addition, since the electric clamps always maintain a sliding engagement with the traction guide, even when switching to the pressure or elastic floating mode in the later stage of treatment, there is no need to stop using or replace the external fixator, further eliminating the transition window between different treatment stages.

[0026] 2. Based on the first fixation member, one of the electric clamps, the other electric clamp, and the second fixation member being distributed sequentially along the first direction, and the second fixation member being connected to the second electric clamp and used to prevent the second electric clamp from moving away from the first electric clamp, the fracture ends can be stably held in the required position during the initial fixation stage without additional adjustment. After entering the traction stage, this connection ensures that when the linear drive mechanism pushes the second electric clamp away from the first electric clamp, the second fixation member is simultaneously pulled, thereby applying unidirectional traction tension to the bone defect site. This achieves a seamless transition from fracture fixation to bone transport traction, without the need to disassemble or assemble any parts or pause treatment throughout the process, thus improving the continuity of the overall treatment.

[0027] 3. Based on a linear drive mechanism, the linear drive mechanism is installed on the first electric clamp. The output end of the linear drive mechanism is connected to the second electric clamp and the controller. The controller is electrically connected to the first electric clamp, the second electric clamp, and the linear drive mechanism. The controller automatically controls the clamping and releasing of the first and second electric clamps according to a preset timing sequence, and synchronously controls the extension and retraction of the linear drive mechanism. This allows the two electric clamps and the linear drive mechanism to work together alternately to achieve unidirectional stepping displacement. The entire traction process does not require manual adjustment or interruption. Due to the precise timing control of the clamping and driving actions by the controller, the fracture fixation, bone end traction, and displacement maintenance are automatically and continuously completed on the same device, avoiding treatment interruptions and gaps caused by manual adjustment, repeated disassembly and assembly, or waiting for doctor's operation in traditional treatments. At the same time, this automated stepping displacement mechanism can uniformly apply traction tension to the bone defect area, ensuring that the bone transport process is not interrupted by human factors, thereby improving the continuity and stability of the overall treatment between fracture fixation and bone defect repair. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an external fixator for fractures with dynamic traction function according to the present invention;

[0029] Figure 2 for Figure 1 A stereoscopic view from another perspective;

[0030] Figure 3 for Figure 2 The cross-sectional perspective view shown;

[0031] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0032] Figure 5 for Figure 2 Another cross-sectional perspective view is shown;

[0033] Figure 6 for Figure 5 A magnified view of a section at point B.

[0034] In the diagram: 1. First fixing component; 2. Second fixing component; 3. Tension guide rail; 4. First electric clamp; 5. Second electric clamp; 6. Linear drive mechanism; 7. Sleeve interface; 8. Clamping seat; 9. Inductor coil; 10. Linear guide rail; 11. Iron core; 12. Through slot; 13. Reset elastic component; 14. Anti-slip strip; 15. Anti-slip plate; 16. First scale; 17. Limiting baffle; 18. Limiting block; 19. First locking component; 20. First rangefinder; 21. Second rangefinder; 22. First indicator light; 23. Second indicator light; 24. Pressure adjusting elastic component; 25. Screw; 26. Fixing nut; 27. Sleeve; 28. Second locking component; 30. Adjusting seat; 31. Observation port; 32. Second scale. Detailed Implementation

[0035] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0036] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] See Figures 1-6 The specific implementation methods of all embodiments of the present invention are as follows:

[0039] A fracture external fixator with dynamic traction function includes a first fixation component 1, a second fixation component 2, a traction guide rail 3, a linear drive mechanism 6, and a controller.

[0040] The first fastener 1 is used to clamp a portion of the broken bone.

[0041] The first fixing member 1 and the second fixing member 2 are distributed at intervals along the first direction. The first fixing member 1 is used to clamp another part of the broken bone.

[0042] It should be noted that both the first fixation element 1 and the second fixation element 2 are adjustable bone pins, which can achieve rigid clamping of the fractured bone fragments by tightening the locking nut or the quick-locking structure. The first direction here refers to the extension direction of the unbroken bone (before the fracture), that is, the direction in which the two broken bones are to be stretched.

[0043] The tension guide rail 3 extends along the first direction and is connected to the first fixing member 1.

[0044] At least two electric grippers are provided, which slide in conjunction with the tension guide rail 3. The gripping ends of the electric grippers can clamp or release the tension guide rail 3.

[0045] It should be noted that the electric clamp can be an electromagnet-type clamp, with a built-in electromagnet and a return spring. When energized, the armature drives the clamping block to press against the guide rail, and when de-energized, the spring releases. Alternatively, it can be a combination of a micro servo motor and a lead screw clamp, where the motor drives the lead screw to rotate, causing the two clamping jaws on both sides to symmetrically close or separate along the guide groove, thereby clamping and releasing the guide rail.

[0046] The first fixing member 1, one of the electric clamps, the other electric clamp, and the second fixing member 2 are distributed sequentially along the first direction. The electric clamp closer to the first fixing member 1 is defined as the first electric clamp 4, and the electric clamp closer to the second fixing member 2 is defined as the second electric clamp 5. The second fixing member 2 is connected to the second electric clamp 5 and is used to prevent the second electric clamp 5 from moving away from the first electric clamp 4.

[0047] It should be noted that the connection relationship between the second fixation element 2 and the second electric clamp 5 varies with the treatment stage. In the early stage of treatment (distraction period), the second fixation element 2 and the second electric clamp 5 are integrally fixedly connected. At this time, the characteristic is that there is no relative movement between the second fixation element 2 and the second electric clamp 5. When the second electric clamp 5 moves away from the first electric clamp 4 under the push of the linear drive mechanism 6, it will simultaneously pull the second fixation element 2 and the clamped bone part, thereby achieving distraction displacement. In the later stage of treatment (compression and elastic floating period, which will be mentioned below, but will be explained here), the second fixation element 2 and the second electric clamp 5 are connected by an adjustable elastic compression. At this time, the characteristic is that when the second electric clamp 5 attempts to move away from the first electric clamp 4, the elastic element between the two will provide a reverse compressive force, thereby limiting or buffering the movement away, in order to adapt to the axial compression or micro-motion elastic floating environment required by the two fracture ends corresponding to the two parts of the fractured bone.

[0048] The linear drive mechanism 6 is mounted on the first electric gripper 4, and the output end of the linear drive mechanism 6 is driven by the second electric gripper 5.

[0049] It should be noted that the linear drive mechanism 6 can be an electric push rod (with a lead screw, which is locked when the power is off), driven by a DC geared motor, with the end of the push rod fixedly connected to the second electric clamp 5; or it can be a piezoelectric ceramic linear motor, which uses the inverse piezoelectric effect of the piezoelectric element to generate high-frequency micro-displacement and drives the slider to make linear motion through friction coupling.

[0050] The controller (not shown in the figure) is electrically connected to the first electric gripper 4, the second electric gripper 5, and the linear drive mechanism 6.

[0051] It should be noted that the controller can be a microcontroller (such as STM32) that integrates relevant drive circuits and outputs signals according to a preset timing sequence to control the working order of the electric gripper and the drive mechanism; or it can be a programmable logic controller (PLC) that controls the relay module through a ladder diagram program to connect the solenoid valve or motor driver respectively, thereby controlling the working order of the electric gripper and the drive mechanism.

[0052] The working principle of the fracture external fixator with dynamic tension function of the present invention is as follows:

[0053] First, a portion of the fractured bone is secured with the first fixator 1, and the other portion is secured with the second fixator 2. Then, the controller controls the first electric clamp 4 to clamp the tension guide rail 3, while simultaneously controlling the second electric clamp 5 to release the tension guide rail 3. The controller then drives the linear drive mechanism 6 mounted on the first electric clamp 4 to extend, its output pushing the second electric clamp 5 and the connected second fixator 2 away from the first electric clamp 4 along a first direction. Subsequently, the controller controls the second electric clamp 5 to clamp the tension guide rail 3 and controls the first electric clamp 4 to release the tension guide rail 3, then drives the linear drive mechanism 6 to retract, pulling the first electric clamp 4 closer to the second electric clamp 5 along the first direction. Through the alternating cooperation of the first electric clamp 4, the second electric clamp 5, and the linear drive mechanism 6, a controllable dynamic tension effect is applied to the two fracture ends corresponding to the two portions of the fractured bone. This automatic cycle of "fixation-tension-refixation" can be manually repeated once every day or two, and the fractured bone can be healed after one cycle (such as one month).

[0054] Obviously, based on the tension guide 3, which extends along the first direction and is connected to the first fixation member 1, and at least two electric clamps that slide in cooperation with the tension guide 3, the clamping ends of the electric clamps can clamp or release the tension guide 3. Since the tension guide 3 is directly connected to the first fixation member 1, and the two electric clamps can selectively clamp or slide on the guide, the initial stabilization and subsequent dynamic tension of the fracture ends can be continuously completed on the same device without the need for removal or replacement of the structure midway, thus avoiding the problems encountered in traditional treatments. After fracture fixation, there is a window period waiting for bone defect repair to begin. At the same time, by alternately clamping the traction guide 3 with two electric clamps and cooperating with the drive mechanism, a step-by-step unidirectional traction tension can be applied to the bone fragment in the first direction, realizing an automatic cycle of "fixation-traction-refixation" and avoiding treatment interruption caused by repeated disassembly and assembly. In addition, since the electric clamps always maintain a sliding engagement with the traction guide 3, even when switching to the compression or elastic floating mode in the later stage of treatment, there is no need to stop using or replace the external fixator, further eliminating the transition window period between different treatment stages.

[0055] Based on the first fixation member 1, one of the electric clamps, the other electric clamp, and the second fixation member 2 being sequentially distributed along the first direction, and the second fixation member 2 being connected to the second electric clamp 5 and used to prevent the second electric clamp 5 from moving away from the first electric clamp 4, the fracture ends can be stably held in the desired position during the initial fixation stage without additional adjustment. After entering the traction stage, this connection ensures that when the linear drive mechanism 6 pushes the second electric clamp 5 away from the first electric clamp 4, the second fixation member 2 is simultaneously pulled, thereby applying unidirectional traction tension to the bone defect site. This achieves a seamless transition from fracture fixation to bone transport traction, without the need to disassemble or suspend any components during the entire process, thus improving the continuity of the overall treatment.

[0056] Based on the linear drive mechanism 6, which is installed on the first electric clamp 4, the output end of the linear drive mechanism 6 is connected to the second electric clamp 5 and the controller. The controller is electrically connected to the first electric clamp 4, the second electric clamp 5 and the linear drive mechanism 6. The controller automatically controls the clamping and releasing of the first electric clamp 4 and the second electric clamp 5 according to a preset timing sequence, and simultaneously controls the extension and retraction of the linear drive mechanism 6. This allows the two electric clamps and the linear drive mechanism 6 to work together alternately to achieve unidirectional stepping displacement. The entire traction process does not require manual adjustment or interruption. Due to the precise timing control of the clamping and driving actions by the controller, the fracture fixation, bone end traction, and displacement maintenance are automatically and continuously completed on the same device, avoiding treatment interruptions and gaps caused by manual adjustment, repeated disassembly and assembly, or waiting for doctor's operation in traditional treatments. At the same time, this automated stepping displacement mechanism can uniformly apply traction tension to the bone defect area, ensuring that the bone transport process is not interrupted by human factors, thereby improving the continuity and stability of the overall treatment between fracture fixation and bone defect repair.

[0057] Preferably, the electric clamp includes a clamping base 8, an inductor coil 9, a linear guide rail 10, and an iron core 11 (electromagnet); the clamping base 8 has a sleeve interface 7 for slidably engaging with the tension guide rail 3, and the clamping base 8 also has a through groove 12 extending radially along the tension guide rail 3 and communicating with the sleeve interface 7; the inductor coil 9 is installed in the through groove 12 and fits against the inner wall of the through groove 12; the linear guide rail 10 is provided in the through groove 12 and extends along the extending direction of the through groove 12; the iron core 11 is slidably engaged with the linear guide rail 10 and passes through the inductor coil 9, so that when the inductor coil 9 is energized by the controller, the iron core 11 is subjected to the magnetic pull (Maxwell magnetic stress) of the inductor coil 9 and moves towards the center of the inductor coil 9, and passes through the sleeve interface 7, until the iron core 11 presses against the tension guide rail 3. Specifically, when the controller energizes the inductor coil 9, the inductor coil 9 generates a magnetic field. The iron core 11 located in the magnetic field is subjected to magnetic pull and moves towards the center of the magnetic field (i.e., the middle of the coil). Since the iron core 11 is restricted by the linear guide rail 10 to move only along the through slot 12, its end will pass through the sleeve interface 7 and press against the surface of the tension guide rail 3, thereby achieving clamping. When the controller cuts off the current, the magnetic field disappears, and the magnetic pull disappears accordingly. The iron core 11 can be reset by the return spring or manually, detach from the surface of the tension guide rail 3, and be released.

[0058] Preferably, two through slots 12, two inductor coils 9, two linear guides 10, and two iron cores 11 are provided. The two through slots 12 are opened on opposite horizontal sides of the clamping base 8; the two inductor coils 9 are installed in the corresponding two through slots 12; the two linear guides 10 are provided in the corresponding two through slots 12; the two iron cores 11 are correspondingly slidably engaged with the two linear guides 10 and can be subjected to the magnetic pull generated by the corresponding two inductor coils 9, thereby coordinating to clamp or release the tension guide 3. Specifically, two through slots 12, two inductor coils 9, two linear guides 10, and two iron cores 11 are provided, respectively located on opposite horizontal sides of the clamping base 8. After the two inductor coils 9 are energized, the two iron cores 11 are simultaneously subjected to magnetic pull, moving from the left and right sides towards the center, passing through the sleeve interface 7 together and coordinating to press the tension guide 3; after the power is turned off, the two iron cores 11 synchronously reset, realizing release. This dual-sided coordinated clamping method ensures that the tension guide rail 3 is subjected to uniform force on both sides, avoiding the skewing or jamming that may be caused by single-sided clamping. At the same time, it increases the clamping force and improves the stability and reliability of clamping.

[0059] Preferably, the electric gripper further includes a reset elastic element 13. One end of the reset elastic element 13 is connected to the iron core 11, and the other end is connected to the gripping seat 8, so that when the inductor coil 9 is energized, the reset elastic element 13 is in a stretched state. Specifically, when the inductor coil 9 is de-energized and the magnetic pull disappears, the reset elastic element 13 automatically pulls the iron core 11 back to its initial position by relying on its own elastic restoring force, so that the iron core 11 is detached from the surface of the tension guide rail 3, realizing reliable and fast automatic release without relying on manual reset or other auxiliary mechanisms, further improving the automation and response speed of the electric gripper's operation.

[0060] Preferably, the tension guide rail 3 is provided with two anti-slip strips 14, which are embedded in the horizontally opposite sides of the tension guide rail 3 and extend along the extension direction of the tension guide rail 3. The clamping ends of the two iron cores 11 are correspondingly provided with two anti-slip plates 15, which are used to correspondingly adhere to the anti-slip strips 14 to cooperate in clamping the tension guide rail 3. Specifically, when the two iron cores 11 are magnetically pulled towards the center and clamp the tension guide rail 3, the two anti-slip plates 15 respectively adhere to the corresponding anti-slip strips 14, cooperating in pressing from both sides. The cooperation between the anti-slip strips 14 and the anti-slip plates 15 increases the coefficient of friction during clamping, effectively preventing relative sliding between the tension guide rail 3 and the electric clamp in the clamped state, improving the stability and positioning accuracy of the clamping, and is especially suitable for bone transport treatment scenarios requiring precise step displacement.

[0061] Preferably, the linear drive mechanism 6 is a miniature electric actuator; the tension guide rail 3 is provided with a first scale 16, which extends along the extension direction of the tension guide rail 3. Specifically, the miniature electric actuator is small in size and has controllable thrust, making it suitable for installation on the first electric clamp 4 and driving the second electric clamp 5 to move; at the same time, the first scale 16 on the tension guide rail 3 allows doctors or operators to intuitively read the relative displacement distance between the two electric clamps, facilitating calibration, verification, or manual intervention. Combined with the precise drive of the miniature electric actuator, this further improves the controllability and visibility of displacement during bone transport.

[0062] Preferably, a limiting baffle 17 is provided at the end of the tension guide rail 3 away from the first fixing member 1. A limiting block 18 is slidably sleeved on the tension guide rail 3. The limiting block 18 is provided with a first locking member 19, which is used to lock the limiting block 18 to the tension guide rail 3. Specifically, the limiting baffle 17 can prevent the second electric clamp 5 from dislodging from the end of the guide rail in case of accidental loss of control or excessive travel; the limiting block 18 can slide along the guide rail to the target position according to the maximum tension distance required for treatment and then be locked by the first locking member 19 (such as threaded locking or pin locking), thereby providing an adjustable soft limit for the displacement range of the second electric clamp 5. The combination of the two ensures safety and allows the total stroke of bone transport to be appropriately set according to the length of the patient's bone defect, improving the adaptability and operational flexibility of the device.

[0063] Preferably, a fracture external fixator with dynamic tension function is further provided with a first distance measuring device 20 and a second distance measuring device 21. The first distance measuring device 20 is installed on a miniature electric push rod and is used to measure the extension distance of the miniature electric push rod. The first distance measuring device 20 is a potentiometer-type sensor. The second distance measuring device 21 is installed on a second fixing member 2 and is used to measure the distance that the second electric clamp 5 is pushed by the miniature electric push rod. Both the first distance measuring device 20 and the second distance measuring device 21 are electrically connected to the controller. Specifically, the first rangefinder 20 uses a potentiometer-type sensor instead of magnetic components such as Hall sensors to avoid the magnetic field generated by the sensor itself interfering with the magnetic field of the inductor coil 9 in the electric gripper, which would cause fluctuations in magnetic pull, delays in the action of the iron core 11, or insufficient clamping force, thus affecting the reliability of the gripping. Through redundant or complementary measurements of the two rangefinders, the controller can obtain more accurate displacement data. On the one hand, it is used for closed-loop control of the extension and retraction of the micro electric push rod. On the other hand, it can verify whether there is an abnormal deviation between the two measurements (such as displacement loss due to gripping slippage), thereby timely detection and alarm, ensuring the accuracy of each step displacement and the safety of treatment during bone transport.

[0064] Preferably, a fracture external fixator with dynamic traction function further includes a first indicator light 22 and a second indicator light 23; the first indicator light 22 is installed on the first electric clamp 4; the second indicator light 23 is installed on the second electric clamp 5; both the first indicator light 22 and the second indicator light 23 are electrically connected to the controller and are used to display the energization status of the inductor coil 9 in the first electric clamp 4 and the inductor coil 9 in the second electric clamp 5, respectively. Specifically, when an inductor coil 9 is energized, the corresponding indicator light illuminates, and vice versa, allowing doctors or operators to intuitively and in real time determine which electric clamp is in a clamping state and which is in a loose state, facilitating the monitoring of the inchworm's crawling and walking process. Simultaneously, in the event of a malfunction (such as an indicator light status that does not match expectations), the problem can be quickly located, improving the observability and safety of the device.

[0065] Preferably, a fracture external fixator with dynamic tension function is further provided with a pressure-adjusting elastic element 24, a screw 25, a fixing nut 26, a sleeve 27, and a second locking element 28; one end of the pressure-adjusting elastic element 24 is connected to the second electric clamp 5, and the other end of the pressure-adjusting elastic element 24 (such as an elastic spring) is rotatably connected to the screw 25; the screw 25 is threadedly connected to the second fixing element 2, and an adjusting seat 30 is provided at the end of the screw 25 away from the pressure-adjusting elastic element 24; the fixing nut 26 is threadedly connected to the screw 25 so as to fix the screw 25 to the second fixing element 2; the sleeve 27 is sleeved on the pressure-adjusting elastic element 24, and the sleeve 27 is provided with an observation port 31 that penetrates the wall thickness of the sleeve 27; the outer wall of the sleeve 27 is also provided with a second scale 32 that extends along the axial direction of the sleeve 27; the second locking element 28 is used to lock the sleeve 27 and the second electric clamp 5 together. It should be noted that after the initial bone growth and healing during the distraction period, a certain length of new callus has formed in the bone defect area through the previous distraction. At this time, the later compression and elastic floating period begins. The above-mentioned structure is used in the later stage of treatment to further accelerate the fracture healing speed. The working principle is as follows: Before entering the compression / elastic floating period, it is necessary to keep the first electric clamp 4, the second electric clamp 5, the linear drive mechanism 6, and the distraction guide rail 3 relatively stationary, that is, forming a whole with the first fixation member 1 (for example, de-energizing the linear drive mechanism 6 and clamping the first electric clamp 4 or the second electric clamp 5 separately, or clamping both at the same time, to ensure that the entire mechanism has no relative movement); then, the second locking member 28 is released from the lock between the second fixation member 2 and the second electric clamp 5 (such as unscrewing the bolt or pulling out the pin), so that the two can move relative to each other; secondly, the screw 25 is driven by rotating the adjusting seat 30. Rotation changes the initial compression of the pressure-adjusting elastic element 24 (note that the pressure-adjusting elastic element 24 requires a pre-set connecting seat, and the screw 25 is rotatably connected to the connecting seat, while the pressure-adjusting elastic element 24 itself does not rotate), thereby applying controllable axial pressure (compression) to the fracture ends, promoting close contact and mineralization of the callus; at the same time, the pressure-adjusting elastic element 24 allows the fracture ends to produce slight elastic fluctuations within a certain range, simulating intermittent mechanical stimulation under physiological conditions, which is beneficial to bone remodeling and improving the healing speed; and the observation port 31 and the second scale 32 on the sleeve 27 can be used to visually read the compression amount, ensuring the accuracy and repeatability of pressure adjustment.

[0066] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fracture external fixator with dynamic traction function, characterized in that, include: The first fixing member (1) is used to clamp a portion of the broken bone; The second fixation member (2) is distributed at intervals along the first direction with the first fixation member (1) and the second fixation member (2), and the first fixation member (1) is used to clamp another part of the broken bone; Tensioning guide (3), which extends along a first direction and is connected to the first fixing member (1); At least two electric grippers are provided, which are slidably engaged with the tension guide rail (3), and the gripping ends of the electric grippers are capable of clamping or releasing the tension guide rail (3). The first fixing member (1), one of the electric clamps, the other electric clamp and the second fixing member (2) are distributed in sequence along the first direction, and the electric clamp closer to the first fixing member (1) is defined as the first electric clamp (4), and the electric clamp closer to the second fixing member (2) is defined as the second electric clamp (5). The second fixing member (2) is connected to the second electric clamp (5) and is used to prevent the second electric clamp (5) from moving away from the first electric clamp (4). A linear drive mechanism (6) is installed on the first electric gripper (4), and the output end of the linear drive mechanism (6) is drivenly connected to the second electric gripper (5). The controller is electrically connected to the first electric gripper (4), the second electric gripper (5), and the linear drive mechanism (6).

2. The fracture external fixator with dynamic traction function according to claim 1, characterized in that, The electric clamp includes a clamping seat (8), an inductor coil (9), a linear guide rail (10), and an iron core (11); the clamping seat (8) has a sleeve (7) for slidably engaging with the tension guide rail (3), and the clamping seat (8) also has a through groove (12) extending radially along the tension guide rail (3) and communicating with the sleeve (7); the inductor coil (9) is mounted in the through groove (12) and fits against the inner wall of the through groove (12); A linear guide (10) is provided in the through groove (12), and the linear guide (10) extends along the extension direction of the through groove (12); the iron core (11) slides with the linear guide (10) and passes through the inductor coil (9), so that when the inductor coil (9) is energized by the controller, the iron core (11) is subjected to the magnetic pull of the inductor coil (9) and moves towards the center of the inductor coil (9) and passes through the sleeve interface (7) until the iron core (11) presses against the tension guide (3).

3. The fracture external fixator with dynamic traction function according to claim 2, characterized in that, Two through slots (12), two inductor coils (9), two linear guides (10), and two iron cores (11) are provided. The two through slots (12) are opened on the horizontal opposite sides of the clamping seat (8). The two inductor coils (9) are installed in the corresponding two through slots (12). The two linear guides (10) are provided in the corresponding two through slots (12). The two iron cores (11) are slidably engaged with the two linear guides (10) and can be subjected to the magnetic pull generated by the corresponding two inductor coils (9), thereby coordinating to clamp or release the tension guide (3).

4. The fracture external fixator with dynamic traction function according to claim 2, characterized in that, The electric clamp also includes a reset elastic element (13), one end of which is connected to the iron core (11) and the other end of which is connected to the clamping seat (8) so that when the inductor coil (9) is energized, the reset elastic element (13) is in a stretched state.

5. A fracture external fixator with dynamic traction function according to claim 3, characterized in that, The tension guide rail (3) is provided with two anti-slip strips (14). The two anti-slip strips (14) are embedded on the horizontal opposite sides of the tension guide rail (3) and extend along the extension direction of the tension guide rail (3). The clamping ends of the two iron cores (11) are provided with two anti-slip plates (15). The two anti-slip plates (15) are used to stick to the anti-slip strips (14) to cooperate in clamping the tension guide rail (3).

6. The fracture external fixator with dynamic traction function according to claim 1, characterized in that, The linear drive mechanism (6) is a miniature electric push rod; the tension guide rail (3) is provided with a first scale (16), which extends along the extension direction of the tension guide rail (3).

7. A fracture external fixator with dynamic traction function according to claim 6, characterized in that, The tension guide rail (3) has a limiting baffle (17) at one end away from the first fixing member (1). The tension guide rail (3) is slidably fitted with a limiting block (18). The limiting block (18) is provided with a first locking member (19). The first locking member (19) is used to lock the limiting block (18) to the tension guide rail (3).

8. A fracture external fixator with dynamic traction function according to claim 6, characterized in that, The fracture external fixator with dynamic tension function is further provided with a first distance measuring device (20) and a second distance measuring device (21). The first distance measuring device (20) is installed on the miniature electric push rod and is used to measure the extension distance of the miniature electric push rod. The first distance measuring device (20) is a potentiometer sensor. The second distance measuring device (21) is installed on the second fixation member (2) and is used to measure the distance that the second electric clamp (5) is pushed by the miniature electric push rod. Both the first rangefinder (20) and the second rangefinder (21) are electrically connected to the controller.

9. A fracture external fixator with dynamic traction function according to claim 2, characterized in that, The fracture external fixator with dynamic traction function further includes a first indicator light (22) and a second indicator light (23); the first indicator light (22) is installed on the first electric clamp (4); the second indicator light (23) is installed on the second electric clamp (5); the first indicator light (22) and the second indicator light (23) are both electrically connected to the controller and are used to display the energization status of the inductor coil (9) in the first electric clamp (4) and the inductor coil (9) in the second electric clamp (5), respectively.

10. A fracture external fixator with dynamic traction function according to claim 1, characterized in that, The fracture external fixator with dynamic tension function is further provided with a pressure-adjusting elastic element (24), a screw (25), a fixing nut (26), a sleeve (27), and a second locking element (28); one end of the pressure-adjusting elastic element (24) is connected to the second electric clamp (5), and the other end of the pressure-adjusting elastic element (24) is rotatably connected to the screw (25); the screw (25) is threadedly connected to the second fixing element (2), and an adjusting seat (30) is provided at the end of the screw (25) away from the pressure-adjusting elastic element (24); the fixing nut (26) and the second fixing element (28) are connected to the second fixing element (2). The screw (25) is threaded to fix the screw (25) to the second fixing member (2); the sleeve (27) is sleeved on the pressure adjusting elastic member (24), the sleeve (27) is provided with an observation port (31), the observation port (31) penetrates the wall thickness of the sleeve (27), the outer wall of the sleeve (27) is also provided with a second scale (32), the second scale (32) extends along the axial direction of the sleeve (27); the second locking member (28) is used to lock the sleeve (27) and the second electric clamp (5) together.

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