CN113082527A

CN113082527A - Bone growth assisting system and telescopic magnetic field generator

Info

Publication number: CN113082527A
Application number: CN202110323112.0A
Authority: CN
Inventors: 聂振国; 刘辛军; 谢福贵; 宫昭; 孟齐志
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-07-09

Abstract

The application provides a bone growth assisting system and a telescopic magnetic field generator, which are used for solving the technical problem of poor postoperative rehabilitation effect of a patient. Wherein, a bone growth promoting system comprises: a sleeve; a magnetic rotating member disposed in the sleeve; the speed reducer is arranged in the sleeve and is matched and connected with the rotating piece; the transmission shaft is arranged in the sleeve and is matched and connected with the speed reducer; the extension rod is at least partially arranged between the transmission shaft and the sleeve, is matched and connected with the transmission shaft, and is driven by the transmission shaft to move axially relative to the sleeve; the telescopic magnetic field generator can be radially and deformably arranged outside the sleeve in a surrounding mode and is used for driving the rotating piece 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 physical condition of the patient, so as to help the postoperative recovery process of the patient to achieve the expected effect.

Description

Bone growth assisting system and telescopic magnetic field generator

Technical Field

The application relates to the technical field of medical use, in particular to a bone growth assisting system and a telescopic magnetic field generator.

Background

In the medical scenes of operations for treating unequal lower limb length, bending, comminuted fracture or broken bone heightening and the like of bones of patients, a method of fixing a bracket or an intramedullary nail in vitro is often adopted to assist the patients to cure diseases. The commonly used external fixed bracket comprises a unilateral external fixed bracket or a round fixed bracket; intramedullary nails are available in mechanical, electrical, and magnetic types. The skeleton can be effectively fixed and the dislocation of the skeleton can be avoided by a method of fixing the bracket or the intramedullary nail in vitro.

In the process of realizing the prior art, the inventor finds that:

both methods of external fixation of stents or intramedullary nails require long periods of bed rest for recovery after the surgical procedure. During recovery, the patient often experiences physical discomfort when moving slightly. Meanwhile, during the slight movement of the patient, the position and shape of the external fixation bracket or the intramedullary nail are also changed, thereby affecting the expected effect of the surgery of the patient. Both methods of external fixation of stents or intramedullary nails can also cause other conditions to occur in patients during treatment, such as: needle tract infection, knee joint flexion contracture, scar contracture, external fixation frame fracture, femur fracture caused by falling down in femoral extension operation, hip joint subluxation, delayed bone nonunion, deep infection, premature consolidation and the like.

Therefore, it is necessary to provide a stable bone growth promoting system and a flexible magnetic field generator to solve the technical problem of poor postoperative rehabilitation effect of patients.

Disclosure of Invention

The embodiment of the application provides a bone growth assisting system and a telescopic magnetic field generator, which are used for solving the technical problem of poor postoperative rehabilitation effect of a patient.

Specifically, the bone growth promoting system comprises:

a sleeve;

a magnetic rotating member disposed in the sleeve;

the speed reducer is arranged in the sleeve and is matched and connected with the rotating piece;

the transmission shaft is arranged in the sleeve and is matched and connected with the speed reducer;

the extension rod is at least partially arranged between the transmission shaft and the sleeve, is matched and connected with the transmission shaft, and is driven by the transmission shaft to move axially relative to the sleeve;

the telescopic magnetic field generator can be radially and deformably arranged outside the sleeve in a surrounding mode and is used for driving the rotating piece to rotate.

Further, the telescopic magnetic field generator includes:

a plurality of magnetic field generating units;

the elastic piece is used for connecting a plurality of magnetic field generating units in series;

the elastic member has two states,

when the elastic piece is stretched by external force, the gap between two adjacent magnetic field generating units is increased, and the telescopic magnetic field generator has a first diameter;

when the external force is released, the elastic piece automatically contracts, the gap between two adjacent magnetic field generating units is reduced, and the telescopic magnetic field generator has a second diameter.

Further, the elastic member includes at least:

one end of the steel rope is fixed on the magnetic field generating unit and is used for connecting the magnetic field generating units in series;

the spring is sleeved on the steel rope and used for providing a recovery elastic force opposite to the external force;

one end of the steel rope is provided with a first stop block for limiting one end of the steel rope so that one end of the steel rope is relatively static with the first magnetic field generating unit;

the other end of the steel rope is detachably connected with the second stop block in a matching mode, the other end of the steel rope is limited, and therefore one end, connected with the second stop block, of the steel rope is static relative to the second magnetic field generating unit.

Furthermore, the steel rope is connected with the second stopper in a threaded connection mode in a matching mode.

Furthermore, the magnetic field generating unit is provided with a through hole, which allows the end of the elastic member not matched with the second stop block to pass through, but does not allow the end of the elastic member provided with the first stop block to pass through.

Further, the first stop block is a cylindrical handle piece; the contact area of the first stop block and the first magnetic field generating unit is larger than the aperture of the through hole, so that the first stop block is suitable for being held and detached by human fingers.

The embodiment of the application also provides a telescopic magnetic field generator.

Specifically, a telescopic magnetic field generator includes:

a plurality of magnetic field generating units;

the elastic member has two states,

Further, the elastic member includes at least:

The technical scheme provided by the embodiment of the application at least has the following beneficial effects:

through the bone growth assisting system and the telescopic magnetic field generator, the magnetic field value of the magnetic field generator can be changed in real time according to the physical condition of the patient, so that the recovery process of the patient after the operation is facilitated to achieve the expected effect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a bone growth promoting system according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a telescopic magnetic field generator according to an embodiment of the present application.

100 bone growth promoting system

11 sleeve

12 rotating part

13 speed reducer

14 drive shaft

15 extension rod

16-telescopic magnetic field generator

161 magnetic field generating unit

162 spring

1621 Steel rope

1622 spring

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the medical scenes of operations for treating unequal lower limb length, bending, comminuted fracture or broken bone heightening and the like of bones of patients, a method of fixing a bracket or an intramedullary nail in vitro is often adopted to assist the patients to cure diseases. After the operation process, the patient needs to be bedridden for a long time to recover by adopting two methods of an external fixation bracket or an intramedullary nail. During recovery, the patient often experiences physical discomfort when moving slightly. Meanwhile, during the slight movement of the patient, the position and shape of the external fixation bracket or the intramedullary nail are also changed, thereby affecting the expected effect of the surgery of the patient. Both methods of external fixation of stents or intramedullary nails can also cause other conditions to occur in patients during treatment, such as: needle tract infection, knee joint flexion contracture, scar contracture, external fixation frame fracture, femur fracture caused by falling down in femoral extension operation, hip joint subluxation, delayed bone nonunion, deep infection, premature consolidation and the like.

Therefore, the inventor provides a bone growth assisting system for solving the technical problem of poor postoperative rehabilitation effect of a patient. Referring to fig. 1, the present application discloses a bone growth promoting system 100, comprising: a sleeve 11; a magnetic rotor 12 disposed in the sleeve 11; a reducer 13 disposed in the sleeve 11 and coupled to the rotor 12; a transmission shaft 14 arranged in the sleeve 11 and connected with the reducer 13 in a matching manner; the extension rod 15 is at least partially arranged between the transmission shaft 14 and the sleeve 11, is matched and connected with the transmission shaft 12, and is driven by the transmission shaft 12 to move axially relative to the sleeve 11; and the telescopic magnetic field generator 16 is radially and deformably arranged outside the sleeve 11 and used for driving the rotating piece 12 to rotate.

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 part of the rotating member 12, the speed reducer 13, the transmission shaft 14 and the extension rod 15 is arranged in the sleeve 11.

It should be noted that the rotating member 12, as a driving member in the rod-like device 100, can provide torque according to its own rotational movement. Which in a particular scenario may be represented as the rotor 12. When the rotor 12 is a rotor 12, the rotor 12 may be made of a magnetic material. The rotor rotator 12 can be driven to rotate by applying a rotating magnetic field. For example, the magnet rotor rotating member 12 may be driven to rotate by applying an external rotating magnetic field.

It is emphasized that the magnet material is a substance capable of generating a magnetic field, and may be a natural product or an artificial magnet. Considering that the rotation member 12 serves as a driving member in the rod-like device 100, providing torque by its own rotational movement, a stable operation state is required. Therefore, when the rotor 12 is a rotor 12, the rotor 12 is preferably made of permanent magnet material in order to prevent the rotor 12 from failing.

The reducer 13 is used to reduce the rotational speed of the rotor 12, thereby increasing the torque provided by the rotor 12. It should be noted that the reducer 13 may be a multi-stage planetary reducer 13 or a harmonic reducer 13. When the speed reducer 13 is a multi-stage planetary gear speed reducer 13, the multi-stage planetary gear speed reducer 13 is connected in series with at least three stages, and the single-stage reduction ratio of the multi-stage planetary gear speed reducer 13 is 1: 4. The multi-stage planetary gear reducer 13 thus has a reduction ratio of 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.

Considering that the harmonic reducer 13 can achieve a larger reduction ratio in a single stage than the multi-stage planetary gear reducer 13 in the same size. And the harmonic reducer 13 has few parts and is easy to maintain. Moreover, the harmonic reducer has the advantages of no back clearance, compact structure, light weight and the like. Therefore, the present decelerator 13 is preferably a harmonic decelerator 13.

Specifically, the harmonic reducer 13 includes a wave generating member, a flexible wheel, and a rigid wheel. Wherein, the flexible wheel is an external gear which is easy to deform. The rigid wheel has an inner gear that meshes with an outer gear of the flexible wheel. The wave generator is a member for controllably elastically deforming the compliant wheel. It is also noted that at least one end of the wave generating member is provided with a cam. The flexible wheel sleeve is arranged outside the wave generating piece. The rigid wheel is sleeved outside the flexible wheel. The wave generating member is coupled to the rotary member 12. The number of rigid gear teeth is greater than the number of flexible gear teeth.

In operation, the wave generating member rotates with the rotor 12. The rigid wheel is used as a fixed part, and the flexible wheel is used as a driven part. When the wave generating member is installed in the flexible wheel, the cam part of the flexible wheel corresponding to the wave generating member is forced to change from the original round shape into a convex end, the external teeth near the convex end of the long shaft of the flexible wheel are completely meshed with the internal teeth of the rigid wheel, and the external teeth near the two ends of the short shaft are completely separated from the internal teeth of the rigid wheel. The teeth of other sections on the circumference are in a transition state of engagement and disengagement. When the wave generating piece rotates continuously, the deformation part or position of the flexible wheel is changed continuously, so that the meshing state of the flexible wheel and the rigid wheel is changed continuously. Thereby realizing that the flexible wheel rotates slowly relative to the rigid wheel along the opposite direction of the rotation of the wave generating piece. It is also to be emphasized that the flexible wheel may be made of an elastic material in order to meet the yielding characteristics. In order to effectively prevent the gear from losing efficacy, the rigid wheel can be made of a hard material.

The transmission shaft 14 is driven by the reducer 13. In the specific embodiment provided in the present application, the transmission shaft 14 may be a lead screw. It should be noted that, in order to ensure the normal operation of the transmission shaft 14, a coupling may be further disposed between the transmission shaft 14 and the reducer 13.

The extension rod 15 is connected with the transmission shaft 14 in a matching mode, and is subjected to axial load generated by the transmission shaft 14 to perform axial linear motion. It should be noted that, considering that the extension rod 15 is the main component of the rod-shaped device 100 for bearing load, the extension rod 15 can be made of high-strength and hard material.

Different from the magnetic field generator in the prior art which is heavy and inconvenient to wear, the telescopic magnetic field generator 16 can be radially and deformably arranged outside the sleeve 11 so as to facilitate the passage of the bone growth part of the patient.

In one embodiment provided herein, the telescopic magnetic field generator 16 comprises at least: a plurality of magnetic field generating units 161; an elastic member 162 for connecting a plurality of magnetic field generating units in series.

Considering that the magnetic field generator is provided as a single magnetic generating unit, the magnetic generating unit is configured to be similar to the bone growth site of the patient. 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 of a single magnetic generating unit, which is inconvenient for the patients to install and wear.

And the flexible magnetic field generator 16 that this application provided can be according to different patients 'skeleton growth position adjustment magnetic field generating unit 161 setting number, and then adjusts flexible magnetic field generator 16 diameter to in patient's installation, dress. In order to improve the adaptability of the telescopic magnetic field generator 16, the magnetic field generating unit 161 is configured to have a shape close to the surgical site of the patient, thereby further reducing the use cost.

It should be noted that, in order to satisfy the requirement that the telescopic magnetic field generator 16 is radially deformable, the magnetic field generating unit 161 is provided with a through hole for the elastic member 162 to pass through. In order to facilitate the rapid serial connection of the magnetic field generating units 161, the elastic member 162 should have a smooth surface to easily pass through the through holes of the magnetic field generating units 161. The elastic member 162 has two states. For example, when the patient needs to install and wear the flexible magnetic field generator 16, only the flexible magnetic field generator 16 needs to be stretched to change the diameter of the flexible magnetic field generator 16, so that the bone growth part of the patient can pass through the flexible magnetic field generator. In the above operation, when the elastic member 162 is stretched by an external force, the gap between two adjacent magnetic field generating units 161 is increased, and the flexible magnetic field generator 16 has a first diameter, so that the bone growth site of the patient can pass through the flexible magnetic field generator 16. When the external force is released, the elastic member 162 is automatically contracted, the gap between two adjacent magnetic field generating units 161 is reduced, and the flexible magnetic field generator 16 has a second diameter, thereby covering the bone growth part of the patient and stably adhering to the surface of the human body.

Considering that the flexible magnetic field generator 16 is frequently disassembled in a specific application scenario, the elastic member 162 is frequently subjected to alternating loads during use, and therefore, the service life of the elastic member 162 needs to be prolonged. In one embodiment provided herein, the elastic member 162 includes at least: the rope is fixed at one end of the magnetic field generating unit and is used for connecting the magnetic field generating units in series; a spring 1622 sleeved on the rope for providing a restoring elastic force opposite to the external force.

It should be noted that, in order to realize the fast serial connection of the magnetic field generating units 161, the elastic member 162 should have a smooth surface to easily pass through the through holes of the magnetic field generating units 161. Correspondingly, the rope should also be smooth in surface, preferably circular in cross-sectional appearance. The rope can be represented as a plastic rope, a metal rope and the like with high strength, light dead weight and stable work in a specific application scene in order to meet the use requirement.

In one embodiment provided herein, the rope is preferably a steel rope 1621. While spring 1622 is easily replaced while still satisfying the restoring spring force necessary to deform the telescopic magnetic field generator 16. 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 the magnetic field generating units 161 in series.

It should be further noted that a first stopper is disposed at one end of the steel cable 1621 to limit one end of the steel cable 1621, so that the one end of the steel cable 1621 and the first magnetic field generating unit are relatively stationary. In order to simplify the assembling operation, easily replace the broken parts, and improve the adaptability of the flexible magnetic field generator 16, considering that the bone growth parts of different patients are different, the other end of the steel cable 1621 is detachably connected with the second block, and the other end of the steel cable 1621 is limited, so that one end of the steel cable 1621 connected with the second block is relatively static with the second magnetic field generating unit.

In one embodiment provided herein, the first stop may be embodied as a cylindrical handle member. The contact area of the first stop block and the first magnetic field generating unit is larger than the aperture of the through hole, so that the first stop block is suitable for being held and detached by human fingers. The steel rope 1621 is connected with the second stopper in a threaded manner, so that a thread is arranged at one end of the steel rope 1621 connected with the second stopper in a matched manner, and the second stopper can be represented as a nut. Thereby realize that flexible magnetic field generator 16 can be according to patient's skeleton growth position diameter, adjust magnetic field generation unit 161 setting amount, and then reach the purpose of adjusting flexible magnetic field generator 16 first diameter, second diameter for flexible magnetic field generator 16 is convenient for patient's installation, dress. After the patient wears the flexible magnetic field generator 16, the magnetic field generating unit 161 can cover the bone growth part of the patient and is stably attached to the surface of the human body of the patient, and the surface of the human body of the patient is not pressed.

It should be further noted that, in one embodiment provided in the present application, the magnetic field generating unit 161 includes: a stator core; a housing covering the stator core and having a chute; and the winding sliding block is arranged in the sliding groove of the shell and slides relative to the stator core.

The magnetic field generating unit 161 housing is provided in a shape close to the surgical site of the patient. Considering that the operation site is different for each patient, if the shape of the housing of the magnetic field generating unit 161 is set according to the relative size of the operation site for each patient, the manufacturing cost of the magnetic field generating unit 161 is obviously not suitable for individual customization by the patient, and it takes a long time to manufacture the magnetic field generating unit 161. Therefore, the magnetic field generating unit 161 is set to a standard specification. The magnetic field generating units 161 with a plurality of standard specifications can be reasonably arranged on various parts of different patients.

It will be appreciated that the magnetic field generating unit 161 is provided to ensure that the rotor 12 is functioning properly to promote bone growth by the patient. Therefore, the magnetic field generating unit 161 is provided with a wire-wound slider that intensifies the magnetic flux. Specifically, a magnetic flux enhancing wound slider can enhance the magnetic flux. The magnetic flux is increased, that is, the area of the vertical magnetic field is enlarged, and the magnetic field is enhanced. Furthermore, a lead is arranged between the winding sliders of the adjacent magnetic field generating units 161, so that the winding sliders form a concentric winding. When the magnetic field generating unit 161 is subjected to an external force, the wires drive the winding sliders to slide relative to the stator core, so as to maintain the relative positions of the winding sliders. Even if the rotating member 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 fields generated by the magnetic field generating units 161 in other directions can be compensated, and the rotating member 12 can be effectively driven to operate.

In one embodiment provided herein, the magnetic field generating unit 161 is provided with a wire-wound slider that reinforces magnetic flux. When the winding coil of the telescopic magnetic field generator 16 is set as an ac excitation coil, the three-phase winding thereof generates a pulsating magnetic field under the action of the enhanced magnetic flux. A pulsating magnetic field is a magnetic field with a fixed spatial position and an amplitude varying between a positive and a negative maximum. If only one winding is arranged on the stator of the motor, a bipolar pulse vibration magnetic field is generated when alternating current is conducted. When the magnitude and direction of the current change, the magnitude and polarity of the magnetic field will change accordingly. The position of the magnetic field in space is always constant. If the magnetic field is approximately considered to be distributed along the circumference in a sine shape, and the space vector at the axis of the magnetic field is used for representing, and the vector length is used for representing the amplitude of the magnetic field, theoretical analysis can prove that the pulsating magnetic field generated by the single-phase winding which is electrified by the alternating current can be decomposed into two circular rotating magnetic fields which have half of the original pulsating magnetic field in amplitude and rotate in opposite directions at the same speed. It will be appreciated that the telescopic magnetic field generator 16 is arranged to achieve a wrap-around alternating magnetic field, and that even if the rotor 12 within the sleeve 11 is not coaxial with the telescopic magnetic field generator 16, other orientations of the magnetic field can compensate for this to effectively drive the rotor 12.

The bone growth assisting system 100 can change the magnetic field value of the magnetic field generator according to the physical condition of the patient in real time through the telescopic magnetic field generator 16 which covers the bone growth part of the patient and is stably attached to the surface of the human body of the patient, so as to drive the rotating part 12, the speed reducer 13, the transmission shaft 14 and the extension rod 15 which are arranged in the sleeve 11 of the bone growth part of the human body to work. To help the recovery process after the operation of the patient to achieve the expected effect. The components of the bone growth system 100 are simple in structure and easy to disassemble, and damaged components inside can be replaced easily.

Referring to fig. 2, to support the bone growth system 100, the present application further provides a telescopic magnetic field generator 16, comprising: a plurality of magnetic field generating units 161; an elastic member 162 for connecting a plurality of magnetic field generating units in series.

Wherein, the setting number of the magnetic field generating unit 161 can be adjusted according to the bone growth positions of different patients by the telescopic magnetic field generator 16, and then the diameter of the telescopic magnetic field generator 16 is adjusted, so that the patient can conveniently install and wear the telescopic magnetic field generator. In order to improve the adaptability of the telescopic magnetic field generator 16, the magnetic field generating unit 161 is configured to have a shape close to the surgical site of the patient, thereby further reducing the use cost.

The telescopic magnetic field generator 16 is covered on the bone growth part of the patient and stably attached to the surface of the human body of the patient to realize a surrounding alternating magnetic field. The telescopic magnetic field generator 16 can change the magnetic field value of the magnetic field generator in real time according to the physical condition of the patient, so as to help the recovery process after the operation of the patient to achieve the expected effect.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statement that there is an element defined as "comprising" … … does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. 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, comprising:

a sleeve;

a magnetic rotating member disposed in the sleeve;

2. A bone growth promoting system as claimed in claim 1 wherein said telescopic magnetic field generator comprises:

a plurality of magnetic field generating units;

the elastic member has two states,

3. A bone growth promoting system as claimed in claim 2, wherein said resilient member comprises at least:

4. A bone growth system according to claim 3, wherein said steel cord is threadably engaged with said second stop.

5. The bone growth promoting system of claim 4, wherein the magnetic field generating unit is provided with a through hole for allowing an end of the elastic member not coupled with the second stopper to pass through, an end of the elastic member provided with the first stopper to pass through, and an end of the elastic member provided with the first stopper to pass through.

6. The bone growth system of claim 5, wherein said first stop is a cylindrical handle member; the contact area of the first stop block and the first magnetic field generating unit is larger than the aperture of the through hole, so that the first stop block is suitable for being held and detached by human fingers.

7. A telescopic magnetic field generator, comprising:

a plurality of magnetic field generating units;

the elastic member has two states,

8. The telescopic magnetic field generator according to claim 7, wherein said elastic member comprises at least:

9. The telescopic magnetic field generator according to claim 8, wherein the magnetic field generating unit is provided with a through hole allowing an end of the elastic member not coupled with the second stopper to pass therethrough and not allowing an end of the elastic member provided with the first stopper to pass therethrough.

10. The telescopic magnetic field generator of claim 9, wherein said first stop is a cylindrical handle member; the contact area of the first stop block and the first magnetic field generating unit is larger than the aperture of the through hole, so that the first stop block is suitable for being held and detached by human fingers.