Bone growth assistance system, flexible magnetic field generator

Abstract

The present application provides a bone growth-assisting system and a flexible magnetic field generator, comprising: a sleeve; a magnetic rotating member disposed in the sleeve; a reducer disposed in the sleeve and matched with the rotating member; a transmission shaft disposed in the sleeve and matched with the reducer, an extension rod at least partially disposed 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; and a flexible magnetic field generator, detachably disposed outside the sleeve, for driving the rotating member to rotate. Thus, the growth of bones is assisted.

Description

Technical Field

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

[0002] In the prior art, in the treatment of lower limb length discrepancy, bending, comminuted fracture or fracture height increase surgery of the patient's bones, an external fixation bracket or an intramedullary nail method is used to assist the patient in curing the disease. Commonly used external fixation brackets include unilateral external fixation brackets or circular fixation brackets, and intramedullary nails include mechanical, electric, and magnetic types. The use of an external fixation bracket or an intramedullary nail method can effectively fix the bones and avoid bone dislocation.

[0003] In the process of implementing the prior art, the inventors found that the two methods of extracorporeal fixation and intramedullary nailing require long-term bed rest for recovery after the operation. During the recovery process, physical discomfort often occurs due to slight movement of the patient, and the discomfort often occurs. At the same time, the position and shape of the extracorporeal fixation or intramedullary nail will also change during the slight movement of the patient, thereby affecting the expected effect of the patient's surgery. The two methods of extracorporeal fixation and intramedullary nailing will also cause other symptoms in the patient during the treatment process, such as: needle tract infection, knee flexion contracture, scar contracture, fracture due to removal of the external fixator, femoral fracture caused by falling during femoral lengthening surgery, hip subluxation, delayed nonunion, deep infection, premature consolidation and other problems.

[0004] Therefore, it is necessary to provide a technical solution for a stable bone growth-promoting system. Summary of the invention

[0005] The embodiment of the present application provides a technical solution for a stable bone growth-promoting system.

[0006] Specifically, a bone growth-assisting system and a flexible magnetic field generator include:

[0007] Sleeve;

[0008] A magnetic rotating member disposed in the sleeve;

[0009] A reducer disposed in the sleeve and matched with the rotating member;

[0010] A transmission shaft arranged in the sleeve and connected to the reducer;

[0011] 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;

[0012] The flexible magnetic field generator is detachably arranged outside the sleeve to drive the rotating member to rotate.

[0013] Furthermore, the flexible magnetic field generator includes a plurality of discrete magnetic field generating units.

[0014] Furthermore, the magnetic field generating unit includes: a winding module for strengthening magnetic flux; and a winding coil wound outside the winding module.

[0015] Furthermore, the magnetic field generating unit also includes a shell for accommodating the winding coil and the winding module.

[0016] Furthermore, the flexible magnetic field generator also includes an ergonomic inner wall component for adhering to the surface of the human body.

[0017] Furthermore, the flexible magnetic field generator also includes a storage bag for storing the magnetic field generating unit.

[0018] Furthermore, the flexible magnetic field generator also includes a locking mechanism for limiting the position of the flexible magnetic field generator when it is attached to the human body.

[0019] A flexible magnetic field generator, comprising:

[0020] Ergonomic inner wall parts, used to adhere to the human body surface;

[0021] A plurality of storage bags fixedly arranged on the inner wall member;

[0022] a magnetic field generating unit stored in the storage bag;

[0023] Furthermore, the flexible magnetic field generator also includes a shell that directly accommodates and installs the magnetic field generating unit.

[0024] Furthermore, the inner contour of the inner wall member matches the outer contour of the arms, legs, waist, chest or waist.

[0025] The technical solution provided in the embodiment of the present application has at least the following beneficial effects: through the bone growth-assisting system and the flexible magnetic field generator, the value of the magnetic field generator can be changed in real time according to the patient's physical condition to help the patient's post-operative recovery process achieve the expected effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 This is a schematic diagram of the structure of the bone growth assisting system provided in an embodiment of the present application.

[0028] Figure 2This is a schematic diagram of the structure of a flexible magnetic field generator provided in an embodiment of the present application.

[0029] Bone Growth System 100

[0030] Flexible magnetic field generator 20

[0031] Sleeve 10

[0032] Rotating member 11

[0033] Reducer 12

[0034] Transmission shaft 13

[0035] Extension rod 14

[0036] Sponge bag 21

[0037] Magnetic generating module bag 22

[0038] Elastic bag 23

[0039] Magnetic generating module 24

[0040] Velcro 25

[0041] Magnetic generating module housing 26 DETAILED DESCRIPTION

[0042] 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.

[0043] Please refer to Figure 1 The present application discloses a bone growth assisting system 100, comprising: a sleeve 10; a magnetic rotating member 11 disposed in the sleeve 10; a reducer 12 disposed in the sleeve 10 and matched with the rotating member 11; a transmission shaft 13 disposed in the sleeve 10 and matched with the reducer 12; an extension rod 14 at least partially disposed between the transmission shaft 13 and the sleeve 10, matched with the transmission shaft 13, and driven by the transmission shaft 13 to move axially relative to the sleeve 10; and a flexible magnetic field generator 20 detachably disposed outside the sleeve 10 for driving the rotating member 11 to rotate.

[0044] Specifically, the sleeve 10 is used to provide a structure for accommodating the rotating member 11, the reducer 12, the transmission shaft 13, and the extension rod 14. At least a portion of the rotating member 11, the reducer 12, the transmission shaft 13, and the extension rod 14 are disposed in the sleeve 10.

[0045] Specifically, the rotating member 11, as an active member in the bone growth assisting system 100, can provide torque according to its own rotational motion. In specific scenarios, it can be manifested as a ratchet rotating member 11, a rotor rotating member 11, a motor rotating member 11, etc. When the rotating member 11 is a ratchet rotating member 11, the ratchet rotating member 11 can be driven to rotate mechanically. For example, the ratchet rotating member 11 can be driven to rotate by pressing. When the rotating member 11 is a rotor rotating member 11, the rotor rotating member 11 can be driven to rotate by applying a rotating magnetic field. For example, the permanent magnet rotor rotating member 11 can be driven to rotate by applying an external rotating magnetic field. When the rotating member 11 is a motor rotating member 11, the motor rotating member 11 can be driven to rotate by applying electricity. For example, the motor rotating member 11 can be driven to rotate by emitting an electrical signal.

[0046] It should be particularly emphasized that, considering that the rotating member 11 is an active member in the bone growth assisting system 100, and provides torque through its own rotational motion, a stable working state is required. Therefore, when the rotating member 11 is a rotor rotating member 11, the present application preferably uses a permanent magnet material to make the rotating member 11, so as to prevent the rotating member 11 from failing.

[0047] It is understandable that the rotating member 11 described in the present application is used as a power source for the bone growth assisting system 100. Therefore, any device that provides torque is considered to be the rotating member 11 described in the present application. 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 creative work are within the scope of protection of the present application.

[0048] The reducer 12 is used to reduce the rotation speed of the rotating member 11, thereby increasing the torque provided by the rotating member 11. It should be pointed out that the reducer 12 can be a multi-stage planetary gear reducer 12 or a harmonic reducer 12. When the reducer 12 is a multi-stage planetary gear reducer 12, the multi-stage planetary gear reducer 12 is connected in series for at least three stages, and the single-stage reduction ratio of the multi-stage planetary gear reducer 12 is 1:4. Therefore, the reduction ratio of the multi-stage planetary gear reducer 12 is at least 1:64. When the reducer 12 is a harmonic reducer 12, the single-stage reduction ratio of the harmonic reducer 12 is at least 1:30. Considering that the harmonic reducer 12 is compared with the multi-stage planetary gear reducer 12 of the same size, the harmonic reducer 12 can achieve a larger reduction ratio in a single stage. And the harmonic reducer 12 has few parts and is easy to maintain. Not only that, the harmonic reducer also has many advantages such as no backlash, compact structure, and light weight. Therefore, the reducer 12 of the present application is preferably a harmonic reducer 12.

[0049] Specifically, the harmonic reducer 12 includes a wave generating component, 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 component is a component that causes the flexible wheel to produce controllable elastic deformation. It should be pointed out that a cam is provided at least at one end of the wave generating component. The flexible wheel sleeve is arranged on the outside of the wave generating component. The rigid wheel sleeve is arranged on the outside of the flexible wheel. It should also be pointed out that the wave generating component is matched with the rotating component 11. The number of rigid wheel teeth is greater than the number of flexible wheel teeth.

[0050] During operation, the wave generating element rotates with the rotating element 11. 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 cross-section of the flexible wheel corresponding to the cam part of the wave generating element is forced to change from the original circle to a convex end, and the outer teeth near the convex 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 on the circumference are in a transitional state of engagement and disengagement. When the wave generating element rotates continuously, the deformation of the flexible wheel changes continuously, so that the meshing state of the flexible wheel and the rigid wheel also changes continuously. Thereby, the flexible wheel can rotate slowly 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 is made of elastic material. In order to effectively prevent gear failure, the rigid wheel is made of hard material.

[0051] The transmission shaft 13 is driven by the reducer 12. In the specific implementation provided in the present application, the transmission shaft 13 may be a lead screw. It should be noted that, in order to ensure the normal operation of the transmission shaft 13, a coupling may be provided between the transmission shaft 13 and the reducer 12.

[0052] The extension rod 14 is matched with the transmission shaft 13 and performs axial linear motion under the axial load generated by the transmission shaft 13. It should be noted that, considering that the extension rod 14 is the main component of the bone growth assisting system 100 that bears the load, the extension rod 14 can be made of high-strength and hard materials.

[0053] The flexible magnetic field generator 20 is detachably arranged outside the sleeve 10 to drive the rotating member 11 to rotate. Specifically, the rotating member 11 is driven to rotate by magnetic force of the flexible magnetic field generator 20. The rotation of the rotating member 11 drives the reducer 12, the transmission shaft 13, and the extension rod 14 in the sleeve 10 to work.

[0054] Furthermore, in a preferred embodiment provided in the present application, the flexible magnetic field generator 20 includes a plurality of discrete magnetic field generating units.

[0055] Specifically, the magnetic field generating unit is the magnetic generating module 24. The flexible magnetic field generator 20 includes a plurality of discrete magnetic generating modules 24, and is not composed of a single magnetic generating module 24. Considering that the flexible magnetic field generator 20 is set as a single magnetic generating module 24. The magnetic generating module 24 needs to be set to a shape similar to the bone growth part of the patient. Therefore, it is set as a plurality of magnetic generating modules 24, and a plurality of discrete magnetic generating modules 24 can be set according to the bone growth part of the patient.

[0056] It should be noted that if a single magnetic generating module 24 is set to a shape similar to the surgical site of the patient, the surgical site of each patient is different, and the shape of the magnetic generating module 24 needs to be set according to the relative size of the surgical site of each patient. The cost of making the magnetic generating module 24 is obviously not suitable for individual customization of the patient, and the production of the magnetic generating module 24 takes a long time. In addition, the installation of a single magnetic generating module 24 will relatively increase the difficulty of operation for medical staff. Therefore, the magnetic generating module 24 is set to standard specifications. Through several standard specifications of magnetic generating modules 24, it can be reasonably installed in various parts of the body of different patients.

[0057] It should be understood that the flexible magnetic field generator 20 is very necessary for the installation of the flexible magnetic field generator 20 through a plurality of discrete magnetic generating modules 24. The magnetic generating modules 24 are provided in a plurality, and a few of the magnetic generating modules 24 can be controlled, or all of the magnetic generating modules 24 can be controlled. The flexible magnetic field generator 20 composed of a plurality of magnetic generating modules 24 is obviously more suitable for the needs of surgical patients. It can be understood that the plurality of discrete magnetic generating modules 24 described herein obviously do not constitute a limitation on the specific protection scope of the present application.

[0058] Furthermore, in a preferred embodiment provided in the present application, the magnetic generating module 24 includes: a winding module for strengthening magnetic flux; and a winding coil wound outside the winding module.

[0059] Specifically, the configuration of the magnetic generating module 24 should ensure that the magnetic generating module 24 can promote bone growth in patients. In one embodiment provided in the present application, the magnetic generating module 24 is provided with a winding module for strengthening magnetic flux; and a winding coil wound outside the winding module.

[0060] It should be noted that the winding module for strengthening magnetic flux and the winding coil wound outside the winding module can increase the magnetic flux. Increasing the magnetic flux means expanding the area of ​​the vertical magnetic field and strengthening the magnetic field.

[0061] It is understandable that in one embodiment provided in the present application, the magnetic generating module 24 is provided with a winding module for strengthening magnetic flux, and a winding coil is wound on the outside thereof. When the winding coil of the rotating flexible magnetic field generator 20 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. 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 sinusoidally distributed 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 is understandable that when the flexible magnetic field generator 20 realizes a surrounding alternating magnetic field, even if the rotating member 11 in the sleeve 10 is not coaxial with the flexible magnetic field generator 20 , magnetic fields in other directions can be compensated to effectively drive the rotating member 11 inside the intramedullary nail.

[0062] Furthermore, in a preferred embodiment provided in the present application, the magnetic generating module 24 also includes a shell for accommodating the winding coil and the winding module.

[0063] Specifically, the winding coil and the winding module of the magnetic generating module 24 should be placed in the shell when they are fixed around the patient. In the embodiment of the present application, the magnetic generating module shell 26 is used to place the magnetic generating module 24, and the magnetic generating module 24 is set as a number of discrete standard magnetic generating modules 24 according to the above. The magnetic generating module 24 should also be provided with a standard shell, that is, the magnetic generating module shell 26. The setting of the shell of the magnetic generating module 24 ensures that the winding module of the magnetic field unit and the winding coil wound on the outside of the winding module can ensure that their shapes are not easy to change to a certain extent. The flexible magnetic field generator 20 plays its stabilizing role in the rotating part 11 of the patient's surgical site. Of course, the magnetic generating module shell 26 is wrapped by the magnetic generating module bag 22. It can be understood that the wrapping method between the magnetic generating module shell 26 and the magnetic generating module 24 described here obviously does not constitute a limitation on the specific protection scope of the present application.

[0064] Furthermore, in a preferred embodiment provided in the present application, the flexible magnetic field generator 20 also includes an ergonomic inner wall member for adhering to the surface of the human body.

[0065] Specifically, the ergonomic inner wall of the flexible magnetic field generator 20 is configured as a sponge bag 21, which can prevent the flexible magnetic field generator 20 from directly contacting the patient's body parts. The sponge bag 21 is attached to the patient's surface, so that the patient's surgical site is indirectly in contact with the flexible magnetic field generator 20.

[0066] It is understandable that if the surgical site of the patient is in direct contact with the magnetic generating module housing 26 of the flexible magnetic field generator 20, then a plurality of magnetic generating module housings 26 need to be fixed in a plurality of different fixing methods. The ergonomic inner wall part is set as a sponge bag 21. While ensuring that the contact with the surgical site of the patient is not damaged, the sponge bag 21 is also set as a continuous surrounding type. Through the continuous surrounding sponge bag 21, a plurality of magnetic generating module housings 26 can be placed on the sponge bag 21. The surgical site of the patient is wrapped on one side of the sponge bag 21, and a plurality of magnetic generating module housings 26 are placed on the other side accordingly. The surgical site of the patient is wrapped on one side of the sponge bag 21 and the magnetic generating module housing 26 is placed on the other side of the sponge bag 21, so that the flexible magnetic field generator 20 can stably attach the generating module housing to the surface of the human body through the ergonomic inner wall part.

[0067] Furthermore, in a preferred embodiment provided in the present application, the flexible magnetic field generator 20 also includes a storage bag for storing the magnetic field generating unit.

[0068] Specifically, a magnetic generating module housing 26 is placed on one side of the sponge bag 21 of the flexible magnetic field generator 20, and the magnetic generating module housing 26 is placed through the magnetic generating module bag 22 on the sponge bag 21. The magnetic generating module bag 22 is attached to the human body surface on one side thereof and is set as an elastic elastic cloth bag 23, and the other side is ordinary cloth. It is understood that the specific form of the storage bag described herein obviously does not constitute a limitation on the specific protection scope of this application.

[0069] It can be understood that the magnetic generating module bag 22 on the sponge bag 21 is used to place the winding module in the magnetic generating module housing 26. That is, by placing the winding module in the magnetic generating module housing 26, the magnetic generating module bag 22 wraps the magnetic generating module housing 26, and the magnetic generating module bag 22 is arranged on one side of the sponge bag 21, so that the flexible magnetic field generator 20 can ensure that its magnetic field acts while preventing the flexible magnetic field generator 20 from causing damage to the surgical site or other parts of the patient.

[0070] Furthermore, in a preferred embodiment provided in the present application, the flexible magnetic field generator 20 also includes a locking mechanism for limiting the position of the flexible magnetic field generator 20 when it is attached to the human body.

[0071] Specifically, in an embodiment provided in the present application, the locking mechanism of the flexible magnetic field generator 20 is set as a Velcro 25. The Velcro 25 used here is the Velcro 25 used in medicine, that is, the sphygmomanometers often used in hospitals and pharmacies use Velcro 25. It can be understood that the specific form of the locking mechanism described here obviously does not constitute a limitation on the specific protection scope of the present application.

[0072] It is understandable that the stability of the Velcro 25 can ensure a certain degree of stability relative to the patient's body parts. If the locking mechanism of the flexible magnetic field generator 20 adopts a mechanical locking mechanism, it may cause puncture to the surgical site of the patient, or the retraction mechanism may fall off, resulting in secondary injury to the patient.

[0073] Please refer to Figure 2 A flexible magnetic field generator 20 includes: an ergonomic inner wall member for adhering to the surface of a human body; a plurality of magnetic generating module bags 22 fixedly arranged on the inner wall member; a magnetic field generating unit housed in the magnetic generating module bags 22; and a locking mechanism connected to the inner wall member for limiting the inner wall member to the human body.

[0074] Specifically, the ergonomic inner wall piece is attached to the human body surface, that is, a plurality of continuous sponge bags 21. A magnetic generating module bag 22 is arranged on the sponge bag 21, and the magnetic generating module bag 22 is fixed on the ergonomic inner wall piece, and a magnetic field generating unit is placed in the magnetic generating module bag 22. The plurality of continuous sponge bags 21 are connected by a locking mechanism, and the locking mechanism is a Velcro 25.

[0075] It should be pointed out that the flexible magnetic field generator 20 has a shell that directly accommodates the magnetic generating module 24, namely, the magnetic generating module shell 26. The magnetic generating module shell 26 is used to place the magnetic generating module 24, and the magnetic generating module 24 is set as a number of magnetic generating modules 24 of standard specifications according to the above. The magnetic field unit should also be provided with a standard shell, namely, the magnetic generating module shell 26. The setting of the magnetic generating module shell 26 ensures that the winding module of the magnetic generating module 24 and the winding coil wound on the outside of the winding module can ensure that their shapes are not easy to change to a certain extent. The flexible magnetic field generator 20 plays its stabilizing role in the rotating part 11 of the patient's surgical site.

[0076] It should be emphasized that in a preferred embodiment provided in the present application, the rotating member 11 is selected as a permanent magnet. The flexible magnetic field generator 20 is connected through a locking mechanism between a plurality of continuous sponge bags 21, and the flexible magnetic field generator 20 realizes a surrounding alternating magnetic field. Even if the permanent magnet and the flexible magnetic field generator 20 are not coaxial, the magnetic fields in other directions can be compensated to effectively drive the rotating member 11 to rotate.

[0077] It is understandable that the ergonomic inner wall member of the flexible magnetic field generator 20, i.e., the sponge bag 21, is provided in various types according to the surgical site of the patient, for example, the sponge bag 21 matches the contour of the arm, leg, waist, chest or neck.

[0078] A specific application of the present application is described below, in which a part of the bone growth-assisting system 100 is embedded in the bone. Through the opening at the bone end, the sleeve 10 guides the bone growth-assisting system 100 to be inserted into the bone marrow. The other part, namely the flexible magnetic field generator 20, is arranged outside the sleeve 10 to drive the rotating member 11 to rotate. The bone growth-assisting system 100 repositions and fixes the broken bone along the physiological curvature of the medullary cavity in the medullary cavity, thereby serving as a means of treating fractures.

[0079] The bone growth-promoting system 100 embedded in the bone can be expressed as an intramedullary extension nail in a specific scenario. Scenarios such as lower limb length inequality, bending, comminuted fractures, or bone fracture height increase that occur in daily life require medical treatment for the above-mentioned bone-related problems. The intramedullary extension nail can be used to fix the broken bone part of the patient.

[0080] In a specific application scenario, the intramedullary extension nail includes a sleeve 10 , a rotating member 11 , a reducer 12 , a transmission shaft 13 , and an extension rod 14 .

[0081] The intramedullary extension nail can be presented as a three-section design in a specific application scenario. They are the first section, the second section, and the third section of the intramedullary extension nail. It should be noted that the first section of the intramedullary extension nail is provided with two second locking holes perpendicular to the extension direction of the extension rod 14. The second section of the intramedullary extension nail is used to drive the extension rod 14 to work. The third section of the intramedullary extension nail is driven by the second section and moves axially through the extension rod 14 to guide the growth of human bones.

[0082] Another part of the bone growth-assisting system 100 can be expressed as a flexible magnetic field generator 20 externally mounted on the bone in a specific scenario. The flexible magnetic field generator 20 is connected by a plurality of continuous sponge bags 21, and the two ends of the sponge bags are fixed by Velcro 25. A plurality of elastic cloth bags 23 are arranged on one side of the sponge bag 21, a magnetic generating module housing 26 is placed in the elastic cloth bag 23, a magnetic generating module bag 22 is placed in the magnetic generating module housing 26, and a magnetic generating module 24 is placed in the magnetic generating module bag 22. The flexible magnetic field generator 20 causes the rotating member 11 in the sleeve 10 to rotate, thereby driving the entire intramedullary extension nail to work.

[0083] In a specific embodiment provided in the present application, an intramedullary extension nail is inserted into the bone marrow through an opening at the broken bone end of the patient.

[0084] It should be pointed out that the intramedullary lengthening nail includes a sleeve 10 , a rotating member 11 and a reducer 12 .

[0085] The rotating member 11 is a permanent magnet driven by a flexible magnetic field generator 20 through magnetic force, and the reducer 12 is a harmonic reducer with a relatively large single-stage reduction ratio.

[0086] The flexible magnetic field generator 20 drives the rotating member 11 to rotate through five magnetic generating modules 24 , and the rotating member 11 is a permanent magnet. The rotating member is decelerated by a reducer 12 .

[0087] The harmonic reducer includes a wave generator; a flexible wheel sleeved outside the wave generator and having an external gear; a rigid wheel sleeved outside the flexible wheel and having an internal gear meshing with the external gear of the flexible wheel. The number of teeth of the rigid wheel is 82, and the number of teeth of the flexible wheel is 80. The reduction ratio of the reducer 100 is 1:40.

[0088] It should be noted that the specific assembly of the intramedullary extension nail can be performed as follows: the permanent magnet is inserted into the permanent magnet shaft and fixed at both ends using a combination of flat washers, spring washers and nuts, so that the rotation of the permanent magnet drives the rotation of the shaft.

[0089] A thrust bearing is placed at the upper end of the permanent magnet shaft, and the wave generator is fixed to the shaft through a threaded connection at the lower end. The lower end of the wave generator is fixed with a nut to prevent the wave generator from falling off during rotation.

[0090] The permanent magnet assembly is placed in the second section of the intramedullary extension nail, and the permanent magnet assembly is fixed in the intramedullary nail with a support ring and a U-shaped buckle.

[0091] In the third section of the intramedullary extension nail, the flexible wheel of the harmonic reducer is connected to the lead screw through a coupling, and the lead screw nut is placed on the lead screw. A support ring and a U-shaped buckle are placed on the end of the lead screw to prevent the lead screw nut from falling off. The lead screw nut is connected to the extension nail through a threaded connection so that the rotation of the flexible wheel drives the lead screw to rotate and thus the extension nail is extended.

[0092] Afterwards, according to the degree of curvature of the patient's bones, the first section and the second section of the intramedullary extension nail are connected by threads and have an included angle of several angles corresponding to the degree of curvature of the patient's bones.

[0093] The second section and the third section of the intramedullary extension nail are connected via a coupling.

[0094] The intramedullary extension nail is embedded in the bone marrow, and the third section of the intramedullary extension nail is installed at the first part of the bone by bolts through the first locking hole. The first section of the intramedullary extension nail is installed at the second part of the bone disconnected from the first part by bolts through the second locking hole. Thus, the intramedullary extension nail and the bone form a relatively stable structure.

[0095] After the operation, according to the recovery of the broken bone growth in the patient's body, the flexible magnetic field generator 20 is wrapped at the site of the broken bone growth of the patient through a sponge bag 21, and then the wrapped sponge bag is fixed by Velcro 25. The magnetic generating module 24 in the flexible magnetic field generator 20 drives the rotating member 11 in the sleeve 10, that is, drives the permanent magnet to rotate, so that the extension rod 14, that is, the intramedullary needle, which is arranged between the transmission shaft 13 and the sleeve 10, is connected with the transmission shaft 13 and is driven by the transmission shaft 13 to move axially relative to the sleeve shaft 10 by 1-2 mm.

[0096] This guides and promotes the growth of the broken bone parts until the broken bone parts of the patient grow to a healed state.

[0097] 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 "includes a ..." does not exclude the existence of other identical elements in the process, method, commodity or device including the element.

[0098] 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 flexible magnetic field generator is detachably arranged outside the sleeve to drive the rotating member to rotate. The flexible magnetic field generator includes a plurality of discrete magnetic field generating units, and the magnetic field generating units include: a winding module for strengthening magnetic flux; A winding coil wound on the outside of the winding module.

2. The bone growth promoting system according to claim 1, characterized in that: The magnetic field generating unit further includes a shell for accommodating the winding coil and the winding module.

3. The bone growth promoting system according to claim 1, characterized in that: The flexible magnetic field generator also includes an ergonomic inner wall component for adhering to the surface of a human body.

4. The bone growth promoting system according to claim 1, characterized in that: The flexible magnetic field generator also includes a storage bag for storing the magnetic field generating unit.

5. The bone growth promoting system according to claim 1, characterized in that: The flexible magnetic field generator also includes a locking mechanism for limiting the position of the flexible magnetic field generator when it is attached to the human body.

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