Bone growth-promoting system, stretchable magnetic field generator

Abstract

The present application provides a bone growth-assisting system and a retractable magnetic field generator to solve the technical problem of poor postoperative rehabilitation effects for patients. Among them, a bone growth-assisting system includes: a sleeve; a magnetic rotating part arranged in the sleeve; a reducer arranged in the sleeve and matched with the rotating part; a transmission shaft arranged in the sleeve and matched with the reducer; an extension rod at least partially arranged between the transmission shaft and the sleeve, matched with the transmission shaft, and driven by the transmission shaft to move axially relative to the sleeve; a retractable magnetic field generator, which can be radially deformed and surrounded by the outside of the sleeve to drive the rotating part to rotate. Compared with the prior art, the bone growth-assisting system can change the magnetic field value of the magnetic field generator in real time according to the patient's physical condition, so as to help the patient's postoperative recovery process achieve the desired effect.

Description

Technical Field

[0001] The present application relates to the field of medical technology, and in particular to a bone growth-promoting system and a stretchable magnetic field generator. Background Art

[0002] In medical scenarios such as treating lower limb length discrepancy, bending, comminuted fractures, or bone heightening surgery, external fixators or intramedullary nails are often used to assist patients in curing the disease. Commonly used external fixators include unilateral external fixators or circular fixators; intramedullary nails include mechanical, electric, and magnetic types. Using external fixators or intramedullary nails can effectively fix bones and avoid bone dislocation.

[0003] In the process of implementing the prior art, the inventor discovered that:

[0004] After the surgery, the patients need to stay in bed for a long time to recover. During the recovery process, the patients often feel physical discomfort when they move slightly. At the same time, the position and shape of the external fixator or intramedullary nail will change during the slight movement of the patient, thus affecting the expected effect of the surgery. The two methods of external fixator or intramedullary nail may also cause other symptoms in the patients during the treatment process, such as: needle tract infection, knee flexion contracture, scar contracture, fracture after external fixator removal, femoral fracture caused by falling during femoral lengthening surgery, hip subluxation, delayed nonunion, deep infection, premature consolidation and other problems.

[0005] Therefore, it is necessary to provide a stable bone growth-assisting system and a retractable magnetic field generator to solve the technical problem of poor postoperative rehabilitation effects of patients. Summary of the invention

[0006] The embodiments of the present application provide a bone growth-assisting system and a stretchable magnetic field generator to solve the technical problem of poor postoperative rehabilitation effects for patients.

[0007] Specifically, a bone growth promoting system includes:

[0008] Sleeve;

[0009] A magnetic rotating member disposed in the sleeve;

[0010] A reducer disposed in the sleeve and connected to the rotating member;

[0011] A transmission shaft arranged in the sleeve and connected to the reducer;

[0012] An extension rod at least partially disposed between the transmission shaft and the sleeve, coupled with the transmission shaft, and driven by the transmission shaft to move axially relative to the sleeve;

[0013] The retractable magnetic field generator is radially deformably arranged around the outside of the sleeve to drive the rotating member to rotate.

[0014] Furthermore, the stretchable magnetic field generator comprises:

[0015] A number of magnetic field generating units;

[0016] An elastic member for connecting a plurality of magnetic field generating units in series;

[0017] The elastic member has two states.

[0018] When the elastic member is stretched by an external force, the gap between two adjacent magnetic field generating units increases, and the stretchable magnetic field generator has a first diameter;

[0019] When the external force is released, the elastic member automatically contracts, the gap between two adjacent magnetic field generating units decreases, and the stretchable magnetic field generator has a second diameter.

[0020] Furthermore, the elastic member at least comprises:

[0021] A steel rope with one end fixed to the magnetic field generating unit, used to connect several magnetic field generating units in series;

[0022] The spring sleeved on the steel rope is used to provide a restoring elastic force opposite to the external force;

[0023] A first stopper is provided at one end of the steel rope to limit the position of the one end of the steel rope so that the one end of the steel rope and the first magnetic field generating unit are relatively stationary;

[0024] The other end of the steel rope is detachably connected to the second stopper to limit the other end of the steel rope so that one end of the steel rope connected to the second stopper is relatively stationary with the second magnetic field generating unit.

[0025] Furthermore, the steel rope is connected to the second stopper by threaded connection.

[0026] Furthermore, the magnetic field generating unit is provided with a through hole, allowing the end of the elastic member not matched with the second stopper to pass through, but not allowing the end of the elastic member provided with the first stopper to pass through.

[0027] Furthermore, the first stopper is a cylindrical handle; the contact area between the first stopper and the first magnetic field generating unit is larger than the aperture of the through hole, which is suitable for being grasped and disassembled by human fingers.

[0028] The embodiment of the present application also provides a stretchable magnetic field generator.

[0029] Specifically, a stretchable magnetic field generator includes:

[0030] A number of magnetic field generating units;

[0031] An elastic member for connecting a plurality of magnetic field generating units in series;

[0032] The elastic member has two states.

[0033] When the elastic member is stretched by an external force, the gap between two adjacent magnetic field generating units increases, and the stretchable magnetic field generator has a first diameter;

[0034] When the external force is released, the elastic member automatically contracts, the gap between two adjacent magnetic field generating units decreases, and the stretchable magnetic field generator has a second diameter.

[0035] Furthermore, the elastic member at least comprises:

[0036] A steel rope with one end fixed to the magnetic field generating unit, used to connect several magnetic field generating units in series;

[0037] The spring sleeved on the steel rope is used to provide a restoring elastic force opposite to the external force;

[0038] A first stopper is provided at one end of the steel rope to limit the position of the one end of the steel rope so that the one end of the steel rope and the first magnetic field generating unit are relatively stationary;

[0039] The other end of the steel rope is detachably connected to the second stopper to limit the other end of the steel rope so that one end of the steel rope connected to the second stopper is relatively stationary with the second magnetic field generating unit.

[0040] Furthermore, the magnetic field generating unit is provided with a through hole, allowing the end of the elastic member not matched with the second stopper to pass through, but not allowing the end of the elastic member provided with the first stopper to pass through.

[0041] Furthermore, the first stopper is a cylindrical handle; the contact area between the first stopper and the first magnetic field generating unit is larger than the aperture of the through hole, which is suitable for being grasped and disassembled by human fingers.

[0042] The technical solution provided in the embodiments of the present application has at least the following beneficial effects:

[0043] Through the bone growth-assisting system and the stretchable magnetic field generator, the magnetic field value of the magnetic field generator can be changed in real time according to the patient's physical condition, so as to help the patient achieve the desired effect in the recovery process after surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0045] Figure 1 This is a schematic diagram of the structure of the bone growth assisting system provided in an embodiment of the present application.

[0046] Figure 2 This is a schematic diagram of the structure of a stretchable magnetic field generator provided in an embodiment of the present application.

[0047] 100 Bone Growth System

[0048] 11 Sleeve

[0049] 12 Rotating parts

[0050] 13 Reducer

[0051] 14 Drive shaft

[0052] 15 Extension rod

[0053] 16. Stretchable magnetic field generator

[0054] 161 Magnetic Field Generating Unit

[0055] 162 Elastic parts

[0056] 1621 Steel Rope

[0057] 1622 Spring DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0059] In medical scenarios such as the treatment of lower limb length discrepancy, bending, comminuted fractures, or bone heightening surgery for patients' bones, extracorporeal fixation brackets or intramedullary nails are often used to assist patients in curing the disease. After the operation, patients need to stay in bed for a long time to recover. During the recovery process, patients often feel physical discomfort when they move slightly. At the same time, the position and shape of the extracorporeal fixation bracket or intramedullary nail will also change during the slight movement of the patient, thus affecting the expected effect of the patient's surgery. The two methods of extracorporeal fixation brackets or intramedullary nails can also cause other symptoms in patients during the treatment process, such as: pin tract infection, knee flexion contracture, scar contracture, fracture after external fixator removal, femoral fracture caused by falling during femoral lengthening surgery, hip subluxation, delayed nonunion, deep infection, premature consolidation and other problems.

[0060] To this end, the inventor of this application provides a bone growth-promoting system to solve the technical problem of poor postoperative rehabilitation effect of patients. Figure 1 The present application discloses a bone growth assisting system 100, comprising: a sleeve 11; a magnetic rotating member 12 disposed in the sleeve 11; a reducer 13 disposed in the sleeve 11 and matched with the rotating member 12; a transmission shaft 14 disposed in the sleeve 11 and matched with the reducer 13; an extension rod 15 at least partially disposed between the transmission shaft 14 and the sleeve 11, matched with the transmission shaft 12, and driven by the transmission shaft 12 to move axially relative to the sleeve 11; and a retractable magnetic field generator 16, which can be radially deformed and surrounded outside the sleeve 11 to drive the rotating member 12 to rotate.

[0061] Specifically, the sleeve 11 is used to provide a structure for accommodating the rotating member 12, the reducer 13, the transmission shaft 14, and the extension rod 15. At least a portion of the rotating member 12, the reducer 13, the transmission shaft 14, and the extension rod 15 are disposed in the sleeve 11.

[0062] It should be noted that the rotating member 12, as an active member in the rod-shaped device 100, can provide torque according to its own rotational motion. In a specific scenario, it can be manifested as a rotor rotating member 12. When the rotating member 12 is a rotor rotating member 12, the rotor rotating member 12 can be made of a magnetic material. The rotor rotating member 12 can be driven to rotate by applying a rotating magnetic field. For example, the magnet rotor rotating member 12 can be driven to rotate by applying an external rotating magnetic field.

[0063] It should be emphasized that the magnetic material is a substance that can generate a magnetic field, and can be a natural product or an artificial magnet. Considering that the rotating member 12 is an active member in the rod-shaped device 100, it provides torque through its own rotational motion and requires a stable working state. Therefore, when the rotating member 12 is a rotor rotating member 12, the present application preferably uses a permanent magnet material to make the rotating member 12, so as to prevent the rotating member 12 from failing.

[0064] The reducer 13 is used to reduce the rotation speed of the rotating member 12, thereby increasing the torque provided by the rotating member 12. It should be noted that the reducer 13 can be a multi-stage planetary gear reducer 13 or a harmonic reducer 13. When the reducer 13 is a multi-stage planetary gear reducer 13, the multi-stage planetary gear reducer 13 is connected in series with at least three stages, and the single-stage reduction ratio of the multi-stage planetary gear reducer 13 is 1:4. Therefore, the reduction ratio of the multi-stage planetary gear reducer 13 is at least 1:64. When the reducer 13 is a harmonic reducer 13, the single-stage reduction ratio of the harmonic reducer 13 is at least 1:30.

[0065] Considering that under the same size, the harmonic reducer 13 can achieve a larger reduction ratio in a single stage compared to the multi-stage planetary gear reducer 13. And the harmonic reducer 13 has fewer parts and is easy to maintain. In addition, the harmonic reducer also has many advantages such as no backlash, compact structure, and light weight. Therefore, the reducer 13 of the present application is preferably a harmonic reducer 13.

[0066] Specifically, the harmonic reducer 13 includes a wave generating member, a flexible wheel, and a rigid wheel. Among them, the flexible wheel is an easily deformable external gear. The rigid wheel has an internal gear meshing with the external gear of the flexible wheel. The wave generating member is a component that causes the flexible wheel to produce controllable elastic deformation. It should also be pointed out that a cam is provided at least at one end of the wave generating member. The flexible wheel sleeve is arranged on the outside of the wave generating member. The rigid wheel sleeve is arranged on the outside of the flexible wheel. The wave generating member is matched with the rotating member 12. The number of rigid wheel teeth is greater than the number of flexible wheel teeth.

[0067] During operation, the wave generating element rotates with the rotating element 12. The rigid wheel serves as a fixed element, and the flexible wheel serves as a driven element. When the wave generating element is installed in the flexible wheel, the cam part of the flexible wheel corresponding to the wave generating element is forced to change from the original circular shape to a protruding end, and the outer teeth near the protruding end of the long axis are fully meshed with the inner teeth of the rigid wheel, while the outer teeth near the two ends of the short axis are completely disengaged from the inner teeth of the rigid wheel. The teeth in other sections of the circumference are in a transitional state of engagement and disengagement. When the wave generating element rotates continuously, the deformation part or position of the flexible wheel is constantly changing, so that the meshing state of the flexible wheel and the rigid wheel is also constantly changing. Thereby, the flexible wheel is slowly rotated relative to the rigid wheel in the opposite direction of the rotation of the wave generating element. It should also be emphasized that in order to meet the characteristic of easy deformation, the flexible wheel can be made of elastic material. In order to effectively prevent gear failure, the rigid wheel can be made of hard material.

[0068] The transmission shaft 14 is driven by the reducer 13. In the specific implementation provided in the present application, the transmission shaft 14 can be a lead screw. It should be noted that, in order to ensure the normal operation of the transmission shaft 14, a coupling can also be provided between the transmission shaft 14 and the reducer 13.

[0069] The extension rod 15 is matched with the transmission shaft 14 and performs axial linear motion under the axial load generated by the transmission shaft 14. It should be noted that, considering that the extension rod 15 is the main component of the rod-shaped device 100 that bears the load, the extension rod 15 can be made of high-strength and hard materials.

[0070] Different from the prior art magnetic field generator which is bulky and inconvenient to wear, the retractable magnetic field generator 16 can be radially deformed and arranged around the outside of the sleeve 11 to facilitate the patient to pass through the bone growth area.

[0071] In a specific implementation provided in the present application, the stretchable magnetic field generator 16 at least includes: a plurality of magnetic field generating units 161; and an elastic member 162 for connecting the plurality of magnetic field generating units in series.

[0072] Considering that if the magnetic field generator is set as a single magnetic generating unit, the magnetic field generating unit needs to be set to a shape close to the patient's bone growth site. This increases the difficulty of manufacturing the magnetic field generator, and the bone growth sites of different patients are also different, resulting in low adaptability of the magnetic field generator with a single magnetic generating unit, which is not convenient for patients to install and wear.

[0073] The elastic magnetic field generator 16 provided by the present application can adjust the number of magnetic field generating units 161 according to the bone growth site of different patients, and then adjust the diameter of the elastic magnetic field generator 16, so as to facilitate the patient to install and wear. In order to improve the adaptability of the elastic magnetic field generator 16, the magnetic field generating unit 161 is set to a shape similar to the surgical site of the patient, further reducing the cost of use.

[0074] It should be pointed out that in order to satisfy the radial deformation of the telescopic magnetic field generator 16, the magnetic field generating unit 161 is provided with a through hole so that the elastic member 162 can pass through. In order to facilitate the rapid serial connection of the magnetic field generating unit 161, the elastic member 162 should have a smooth surface and be easy to pass through the through hole of the magnetic field generating unit 161. The elastic member 162 has two states. For example, when the patient needs to install and wear the telescopic magnetic field generator 16, it is only necessary to stretch the telescopic magnetic field generator 16 to change the diameter of the telescopic magnetic field generator 16 to facilitate the passage of the patient's bone growth site. During the above operation, when the elastic member 162 is stretched by an external force, the gap between the two adjacent magnetic field generating units 161 increases, and the telescopic magnetic field generator 16 has a first diameter, so that the patient's bone growth site passes through the telescopic magnetic field generator 16. When the external force is released, the elastic member 162 automatically contracts, the gap between the two adjacent magnetic field generating units 161 decreases, and the telescopic magnetic field generator 16 has a second diameter, thereby covering the patient's bone growth site and stably attaching to the human body surface.

[0075] Considering that the telescopic magnetic field generator 16 is often disassembled in a specific application scenario, the elastic member 162 is often subjected to alternating loads during use, so it is necessary to increase the service life of the elastic member 162. In a specific embodiment provided in the present application, the elastic member 162 at least includes: a rope with one end fixed to the magnetic field generating unit, which is used to connect several magnetic field generating units in series; and a spring 1622 sleeved on the rope, which is used to provide a restoring elastic force opposite to the external force.

[0076] It should be noted that, in order to realize the rapid serial connection of the magnetic field generating unit 161, the elastic member 162 should have a smooth surface and be easy to pass through the through hole of the magnetic field generating unit 161. Accordingly, the rope should also have a smooth surface, and the cross-section is preferably circular. In order to meet the use requirements, the rope can be a plastic rope, a metal rope, etc. with high strength, light weight, and stable operation in a specific application scenario.

[0077] In a specific embodiment provided in the present application, the rope is preferably a steel rope 1621. The spring 1622 can satisfy the restoring elastic force required for the deformation of the elastic magnetic field generator 16 and is easy to replace. Therefore, the spring 1622 is sleeved on the steel rope 1621 and passes through the through hole of the magnetic field generating unit 161 together with the steel rope 1621, thereby connecting several magnetic field generating units 161 in series.

[0078] It should also be pointed out that a first stopper is provided at one end of the steel rope 1621 to limit the position of the steel rope 1621 so that the steel rope 1621 and the first magnetic field generating unit are relatively stationary. Considering that the bone growth sites of different patients are also different, in order to simplify the assembly operation, facilitate the replacement of faulty parts, and improve the adaptability of the telescopic magnetic field generator 16, the other end of the steel rope 1621 is detachably connected to the second stopper to limit the position of the other end of the steel rope 1621 so that the end of the steel rope 1621 connected to the second stopper is relatively stationary with the second magnetic field generating unit.

[0079] In a specific embodiment provided in the present application, the first block can be expressed as a cylindrical handle. The contact area between the first block and the first magnetic field generating unit is larger than the aperture of the through hole, which is suitable for human fingers to hold and disassemble. The steel rope 1621 is connected with the second block in a threaded connection manner. Therefore, one end of the steel rope 1621 that is connected to the second block is provided with a thread, and the second block can be expressed as a nut. Thereby, the telescopic magnetic field generator 16 can adjust the setting amount of the magnetic field generating unit 161 according to the diameter of the patient's bone growth part, thereby achieving the purpose of adjusting the first diameter and the second diameter of the telescopic magnetic field generator 16, so that the telescopic magnetic field generator 16 is easy for the patient to install and wear. After the patient installs and wears the telescopic magnetic field generator 16, the magnetic field generating unit 161 can cover the patient's bone growth part and stably adhere to the patient's body surface without causing a sense of oppression on the patient's body surface.

[0080] It should also be pointed out that in a specific embodiment provided in the present application, the magnetic field generating unit 161 includes: a stator core; a shell covering the stator core and provided with a slide groove; and a winding slider arranged in the shell slide groove and sliding relative to the stator core.

[0081] The shell of the magnetic field generating unit 161 is set to a shape similar to the surgical site of the patient. Considering that the surgical site of each patient is different, if the shape of the shell of the magnetic field generating unit 161 is set according to the relative size of the surgical site of each patient, the production cost of the magnetic field generating unit 161 is obviously not suitable for individual customization of the patient, and the production of the magnetic field generating unit 161 takes a long time. Therefore, the shell of the magnetic field generating unit 161 is set to a standard specification. Through a number of standard specifications of the magnetic field generating units 161, it can be reasonably installed in various parts of the body of different patients.

[0082] It is understandable that the setting of the magnetic field generating unit 161 should ensure that the rotating part 12 can work normally, so as to promote the bone growth of the patient. Therefore, the magnetic field generating unit 161 is provided with a winding slider that strengthens the magnetic flux. Specifically, the winding slider that strengthens the magnetic flux can increase the magnetic flux. Increasing the magnetic flux means expanding the area of ​​the vertical magnetic field and enhancing the magnetic field. Further, a wire is provided between the winding sliders of adjacent magnetic field generating units 161, so that several winding sliders form a concentric winding. When the magnetic field generating unit 161 is subjected to an external force, the wire drives the winding slider to slide relative to the stator core so as to maintain the relative positions of several winding sliders. Even if the rotating part 12 of the bone growth assisting system 100 is not coaxial with the magnetic field generated by the telescopic magnetic field generator 16, the magnetic field generated by the magnetic field generating unit 161 in other directions can be compensated and can effectively drive the rotating part 12 to work.

[0083] In a specific embodiment provided in the present application, the magnetic field generating unit 161 is provided with a winding slider for strengthening the magnetic flux. When the winding coil of the telescopic magnetic field generator 16 is set as an AC excitation coil, under the effect of the enhanced magnetic flux, its three-phase winding generates a pulsating magnetic field. A pulsating magnetic field is a magnetic field with a fixed spatial position and an amplitude that varies between positive and negative maximum values. If there is only one winding on the stator of the motor, a bipolar pulsating magnetic field is generated when an alternating current is passed through it. When the magnitude and direction of the current change, the magnitude and polarity of the magnetic field will change accordingly. However, the position of the magnetic field in space remains unchanged. If it is approximately assumed that the magnetic field is distributed sinusoidally along the circumference, and is represented by a spatial vector at the axis of the magnetic field, and the magnetic field amplitude is represented by the vector length, then theoretical analysis can prove that the pulsating magnetic field generated by the single-phase winding passing an alternating current can be decomposed into two circular rotating magnetic fields with an amplitude of half the original pulsating magnetic field and rotating in opposite directions at the same rate. It can be understood that when the elastic magnetic field generator 16 realizes a surrounding alternating magnetic field, even if the rotating member 12 in the sleeve 11 is not coaxial with the elastic magnetic field generator 16 , magnetic fields in other directions can be compensated to effectively drive the rotating member 12 to work.

[0084] The bone growth-assisting system 100 can change the magnetic field value of the magnetic field generator in real time according to the patient's physical condition through the retractable magnetic field generator 16 that covers the bone growth part of the patient and stably adheres to the patient's body surface, thereby driving the rotating part 12, the reducer 13, the transmission shaft 14, and the extension rod 15 installed in the sleeve 11 at the bone growth part of the human body to work. This helps the patient's postoperative recovery process achieve the desired effect. The component structure of the bone growth-assisting system 100 is simple and easy to disassemble, and the damaged components inside can be easily replaced.

[0085] Please refer to Figure 2 To support the bone growth assisting system 100, the present application further provides a retractable magnetic field generator 16, comprising: a plurality of magnetic field generating units 161; and an elastic member 162 for connecting the plurality of magnetic field generating units in series.

[0086] The elastic magnetic field generator 16 can adjust the number of magnetic field generating units 161 according to the bone growth site of different patients, and then adjust the diameter of the elastic magnetic field generator 16, so as to facilitate the patient to install and wear. In order to improve the adaptability of the elastic magnetic field generator 16, the magnetic field generating unit 161 is set to a shape similar to the surgical site of the patient, further reducing the cost of use.

[0087] It should be pointed out that in order to satisfy the radial deformation of the telescopic magnetic field generator 16, the magnetic field generating unit 161 is provided with a through hole so that the elastic member 162 can pass through. In order to facilitate the rapid serial connection of the magnetic field generating unit 161, the elastic member 162 should have a smooth surface and be easy to pass through the through hole of the magnetic field generating unit 161. The elastic member 162 has two states. For example, when the patient needs to install and wear the telescopic magnetic field generator 16, it is only necessary to stretch the telescopic magnetic field generator 16 to change the diameter of the telescopic magnetic field generator 16 to facilitate the passage of the patient's bone growth site. During the above operation, when the elastic member 162 is stretched by an external force, the gap between the two adjacent magnetic field generating units 161 increases, and the telescopic magnetic field generator 16 has a first diameter, so that the patient's bone growth site passes through the telescopic magnetic field generator 16. When the external force is released, the elastic member 162 automatically contracts, the gap between the two adjacent magnetic field generating units 161 decreases, and the telescopic magnetic field generator 16 has a second diameter, thereby covering the patient's bone growth site and stably attaching to the human body surface.

[0088] Considering that the telescopic magnetic field generator 16 is often disassembled in a specific application scenario, the elastic member 162 is often subjected to alternating loads during use, so it is necessary to increase the service life of the elastic member 162. In a specific embodiment provided in the present application, the elastic member 162 at least includes: a rope with one end fixed to the magnetic field generating unit, which is used to connect several magnetic field generating units in series; and a spring 1622 sleeved on the rope, which is used to provide a restoring elastic force opposite to the external force.

[0089] It should be noted that, in order to realize the rapid serial connection of the magnetic field generating unit 161, the elastic member 162 should have a smooth surface and be easy to pass through the through hole of the magnetic field generating unit 161. Accordingly, the rope should also have a smooth surface, and the cross-section is preferably circular. In order to meet the use requirements, the rope can be a plastic rope, a metal rope, etc. with high strength, light weight, and stable operation in a specific application scenario.

[0090] In a specific embodiment provided in the present application, the rope is preferably a steel rope 1621. The spring 1622 can satisfy the restoring elastic force required for the deformation of the elastic magnetic field generator 16 and is easy to replace. Therefore, the spring 1622 is sleeved on the steel rope 1621 and passes through the through hole of the magnetic field generating unit 161 together with the steel rope 1621, thereby connecting several magnetic field generating units 161 in series.

[0091] It should also be pointed out that a first stopper is provided at one end of the steel rope 1621 to limit the position of the steel rope 1621 so that the steel rope 1621 and the first magnetic field generating unit are relatively stationary. Considering that the bone growth sites of different patients are also different, in order to simplify the assembly operation, facilitate the replacement of faulty parts, and improve the adaptability of the telescopic magnetic field generator 16, the other end of the steel rope 1621 is detachably connected to the second stopper to limit the position of the other end of the steel rope 1621 so that the end of the steel rope 1621 connected to the second stopper is relatively stationary with the second magnetic field generating unit.

[0092] In a specific embodiment provided in the present application, the first block can be expressed as a cylindrical handle. The contact area between the first block and the first magnetic field generating unit is larger than the aperture of the through hole, which is suitable for human fingers to hold and disassemble. The steel rope 1621 is connected with the second block in a threaded connection manner. Therefore, one end of the steel rope 1621 that is connected to the second block is provided with a thread, and the second block can be expressed as a nut. Thereby, the telescopic magnetic field generator 16 can adjust the setting amount of the magnetic field generating unit 161 according to the diameter of the patient's bone growth part, thereby achieving the purpose of adjusting the first diameter and the second diameter of the telescopic magnetic field generator 16, so that the telescopic magnetic field generator 16 is easy for the patient to install and wear. After the patient installs and wears the telescopic magnetic field generator 16, the magnetic field generating unit 161 can cover the patient's bone growth part and stably adhere to the patient's body surface without causing a sense of oppression on the patient's body surface.

[0093] It should also be pointed out that in a specific embodiment provided in the present application, the magnetic field generating unit 161 includes: a stator core; a shell covering the stator core and provided with a slide groove; and a winding slider arranged in the shell slide groove and sliding relative to the stator core.

[0094] The shell of the magnetic field generating unit 161 is set to a shape similar to the surgical site of the patient. Considering that the surgical site of each patient is different, if the shape of the shell of the magnetic field generating unit 161 is set according to the relative size of the surgical site of each patient, the production cost of the magnetic field generating unit 161 is obviously not suitable for individual customization of the patient, and the production of the magnetic field generating unit 161 takes a long time. Therefore, the shell of the magnetic field generating unit 161 is set to a standard specification. Through a number of standard specifications of the magnetic field generating units 161, it can be reasonably installed in various parts of the body of different patients.

[0095] It is understandable that the setting of the magnetic field generating unit 161 should ensure that the rotating part 12 can work normally, so as to promote the bone growth of the patient. Therefore, the magnetic field generating unit 161 is provided with a winding slider that strengthens the magnetic flux. Specifically, the winding slider that strengthens the magnetic flux can increase the magnetic flux. Increasing the magnetic flux means expanding the area of ​​the vertical magnetic field and enhancing the magnetic field. Further, a wire is provided between the winding sliders of adjacent magnetic field generating units 161, so that several winding sliders form a concentric winding. When the magnetic field generating unit 161 is subjected to an external force, the wire drives the winding slider to slide relative to the stator core so as to maintain the relative positions of several winding sliders. Even if the rotating part 12 of the bone growth assisting system 100 is not coaxial with the magnetic field generated by the telescopic magnetic field generator 16, the magnetic field generated by the magnetic field generating unit 161 in other directions can be compensated and can effectively drive the rotating part 12 to work.

[0096] In a specific embodiment provided in the present application, the magnetic field generating unit 161 is provided with a winding slider for strengthening the magnetic flux. When the winding coil of the telescopic magnetic field generator 16 is set as an AC excitation coil, under the effect of the enhanced magnetic flux, its three-phase winding generates a pulsating magnetic field. A pulsating magnetic field is a magnetic field with a fixed spatial position and an amplitude that varies between positive and negative maximum values. If there is only one winding on the stator of the motor, a bipolar pulsating magnetic field is generated when an alternating current is passed through it. When the magnitude and direction of the current change, the magnitude and polarity of the magnetic field will change accordingly. However, the position of the magnetic field in space remains unchanged. If it is approximately assumed that the magnetic field is distributed sinusoidally along the circumference, and is represented by a spatial vector at the axis of the magnetic field, and the magnetic field amplitude is represented by the vector length, then theoretical analysis can prove that the pulsating magnetic field generated by the single-phase winding passing an alternating current can be decomposed into two circular rotating magnetic fields with an amplitude of half the original pulsating magnetic field and rotating in opposite directions at the same rate. It can be understood that when the elastic magnetic field generator 16 realizes a surrounding alternating magnetic field, even if the rotating member 12 in the sleeve 11 is not coaxial with the elastic magnetic field generator 16 , magnetic fields in other directions can be compensated to effectively drive the rotating member 12 to work.

[0097] The flexible magnetic field generator 16 covers the bone growth area of ​​the patient and stably adheres to the patient's body surface to achieve a surrounding alternating magnetic field. The flexible magnetic field generator 16 can change the magnetic field value of the magnetic field generator in real time according to the patient's physical condition to help the patient achieve the desired effect during the recovery process after surgery.

[0098] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the existence of other identical elements in the process, method, commodity or device including the element.

[0099] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A bone growth promoting system, characterized in that: include: Sleeve; A magnetic rotating member disposed in the sleeve; A reducer disposed in the sleeve and matched with the rotating member; A transmission shaft arranged in the sleeve and connected to the reducer; An extension rod at least partially disposed between the transmission shaft and the sleeve, coupled with the transmission shaft, and driven by the transmission shaft to move axially relative to the sleeve; A retractable magnetic field generator is radially deformably disposed around the outside of the sleeve to drive the rotating member to rotate; The stretchable magnetic field generator comprises: a plurality of magnetic field generating units; an elastic member for connecting the plurality of magnetic field generating units in series; The elastic member has two states. When the elastic member is stretched by an external force, the gap between two adjacent magnetic field generating units increases, and the stretchable magnetic field generator has a first diameter. When the external force is released, the elastic member automatically contracts, the gap between two adjacent magnetic field generating units decreases, and the retractable magnetic field generator has a second diameter; The magnetic field generating unit comprises: a stator core; a housing covering the stator core and provided with a slide groove; a winding slider provided in the slide groove of the housing and sliding relative to the stator core; Conducting wires are arranged between the winding sliders of adjacent magnetic field generating units, so that a plurality of winding sliders form a concentric winding; When the magnetic field generating unit is subjected to external force, the conducting wire drives the winding slider to slide relative to the stator core so as to maintain the relative positions of the plurality of winding sliders.

2. The bone growth-promoting system according to claim 1, characterized in that: The stretchable magnetic field generator comprises: A number of magnetic field generating units; An elastic member for connecting a plurality of magnetic field generating units in series; The elastic member has two states. When the elastic member is stretched by an external force, the gap between two adjacent magnetic field generating units increases, and the stretchable magnetic field generator has a first diameter. When the external force is released, the elastic member automatically contracts, the gap between two adjacent magnetic field generating units decreases, and the stretchable magnetic field generator has a second diameter.

3. The bone growth-promoting system according to claim 2, characterized in that: The elastic member at least comprises: A steel rope with one end fixed to the magnetic field generating unit, used to connect several magnetic field generating units in series; The spring sleeved on the steel rope is used to provide a restoring elastic force opposite to the external force; A first stopper is provided at one end of the steel rope to limit the position of the one end of the steel rope so that the one end of the steel rope and the first magnetic field generating unit are relatively stationary; The other end of the steel rope is detachably connected to the second stopper to limit the other end of the steel rope so that one end of the steel rope connected to the second stopper is relatively stationary with the second magnetic field generating unit.

4. The bone growth promoting system according to claim 3, characterized in that: The steel rope and the second stopper are connected in a threaded manner.

5. The bone growth promoting system according to claim 4, characterized in that: The magnetic field generating unit is provided with a through hole, which allows the end of the elastic member not matched with the second stopper to pass through, but does not allow the end of the elastic member provided with the first stopper to pass through.

6. The bone growth promoting system according to claim 5, characterized in that: The first stopper is a cylindrical handle; the contact area between the first stopper and the first magnetic field generating unit is larger than the aperture of the through hole, and is suitable for being grasped and disassembled by human fingers.

7. The stretchable magnetic field generator according to claim 6, characterized in that: The elastic member at least comprises: A steel rope with one end fixed to the magnetic field generating unit, used to connect several magnetic field generating units in series; The spring sleeved on the steel rope is used to provide a restoring elastic force opposite to the external force; A first stopper is provided at one end of the steel rope to limit the position of the one end of the steel rope so that the one end of the steel rope and the first magnetic field generating unit are relatively stationary; The other end of the steel rope is detachably connected to the second stopper to limit the other end of the steel rope so that one end of the steel rope connected to the second stopper is relatively stationary with the second magnetic field generating unit.

8. The stretchable magnetic field generator according to claim 7, characterized in that: The magnetic field generating unit is provided with a through hole, which allows the end of the elastic member not matched with the second stopper to pass through, but does not allow the end of the elastic member provided with the first stopper to pass through.

9. The stretchable magnetic field generator according to claim 8, characterized in that: The first stopper is a cylindrical handle; the contact area between the first stopper and the first magnetic field generating unit is larger than the aperture of the through hole, and is suitable for being grasped and disassembled by human fingers.

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