CN116919556A

CN116919556A - Bone extension intramedullary nail device and electromagnetic intramedullary limb reconstruction system

Info

Publication number: CN116919556A
Application number: CN202310974080.XA
Authority: CN
Inventors: 刘宏波; 蔡普立; 王玉龙; 胡问宏; 王钦国; 何远琨
Original assignee: Shanghai Carefix Medical Instrument Co ltd
Current assignee: Shanghai Carefix Medical Instrument Co ltd
Priority date: 2023-08-03
Filing date: 2023-08-03
Publication date: 2023-10-24
Anticipated expiration: 2043-08-03
Also published as: CN116919556B

Abstract

The application discloses a bone extension intramedullary nail device and an electromagnetic intramedullary limb reconstruction system, wherein the device comprises: the device comprises a main nail, a sub-nail, a traction assembly, a speed reducing assembly and a driving assembly. The torque of the driving assembly is transmitted to the speed reducing assembly, and the traction assembly is driven to draw the female nails and the sub nails so that the female nails and the sub nails are far away from each other by a preset value. The bone extension intramedullary nail device can remotely detect and control the driving component to realize accurate traction, has a reliable extension process monitoring and controlling mechanism, and avoids serious complications such as bone nonunion, nerve injury and the like. After the subsequent physician determines that the bone has reached the desired condition, the bone extension intramedullary nail device of the present application is no longer needed and is removed using standard surgical techniques, and the bone is less prone to fracture risk after removal.

Description

Bone extension intramedullary nail device and electromagnetic intramedullary limb reconstruction system

Technical Field

The application relates to the technical field of bone rectification and rehabilitation, in particular to a bone extension intramedullary nail device and an electromagnetic intramedullary limb reconstruction system.

Background

Bone extension definition: namely, stretching and osteogenesis are carried out, namely bone is cut, soft tissues and blood supply are reserved, a special traction device is used for fixing two ends, a tension force is gradually applied by using a tensile stress rule to slowly stretch the bone segments, body tissues are continuously stimulated, the regeneration potential of human tissues is stimulated, and a new bone is formed in an osteotomy gap, so that the aim of bone regeneration is fulfilled.

For the distraction osteogenesis technique, the development is attributed to the professor Ilizarov, who has used this method since the 40 th century, and developed external fixators such as ring external fixators and unilateral fixation systems. The stretch-draw osteogenesis technology is based on the theory of tension-stress tissue regeneration and is mainly used for limb extension and bone segment movement. External fixation frames are used for limb extension, pain is the most common complaint of patients, and particularly joint stiffness can be caused in the process of muscle and nerve traction, and osteoporosis stress fracture can occur due to improper application. Patients also have symptoms of inappetence and even depression in some cases; more importantly, the fracture risk exists in the new bone after the external fixing frame is removed.

Disclosure of Invention

The application aims to provide a bone extension intramedullary nail device and an electromagnetic intramedullary limb reconstruction system, so as to solve the problems that patients have inappetence and even depression symptoms in partial case reports; more importantly, the technical problem that the fracture risk exists in the new bone after the external fixing frame is removed.

In order to achieve the above purpose, the present application provides the following technical solutions:

a bone extension intramedullary nail device, comprising: the device comprises a main nail, a sub-nail, a traction assembly, a speed reducing assembly and a driving assembly;

the female nails and the sub nails are connected with each other and can be close to or far away from each other, and the female nails and the sub nails are provided with cavities which are communicated with each other;

the traction assembly, the speed reduction assembly and the driving assembly are all arranged in the cavity, the traction assembly is connected with the main nails and the sub nails, the speed reduction assembly is arranged on the traction assembly, and the driving assembly is connected with the speed reduction assembly;

the torque of the driving assembly is transmitted to the speed reducing assembly, and the traction assembly is driven to draw the female nails and the male nails, so that the female nails and the male nails are far away from each other by a preset value.

The female nail and the male nail are open at one end opposite to each other, and the outer diameter of the male nail is matched with the inner pipe diameter of the female nail, so that one end of the male nail, which faces the female nail, is movably sleeved in the inner pipe of the female nail.

Illustratively, the pulling assembly includes:

the screw rod is arranged in the cavity, one end of the screw rod is fixedly connected with the female screw, the sub screw can slide relative to the screw rod in the length direction of the screw rod, and the speed reducing assembly and the driving assembly are both arranged on the screw rod and are both in threaded connection with the screw rod;

the guide piece is connected with the screw rod and the speed reduction assembly, and the sub-nails are connected with the guide piece;

wherein, drive assembly drive the deceleration assembly towards the sub-nail displacement, and promote the guide, so that the sub-nail is kept away from mother the pulling assembly includes:

the screw rod is arranged in the cavity, one end of the screw rod is fixedly connected with the female screw, the sub screw can slide relative to the screw rod in the length direction of the screw rod, the speed reducing assembly and the driving assembly are arranged on the screw rod, and the speed reducing assembly is in threaded transmission connection with the screw rod;

the guide piece is in transmission connection with the screw rod, and the sub-nails are connected with the guide piece;

the driving assembly drives the speed reducing assembly and pushes the guide piece so that the sub-nails are far away from the main nails.

Illustratively, the pulling assembly includes a threaded structure formed on a wall of the cavity, the deceleration assembly is threadably coupled to the threaded structure, and the driving assembly drives the deceleration assembly toward the sub-staples and pushes the sub-staples away from the parent staples.

The speed reduction assembly is an exemplary planetary gear speed reducer, the speed reduction assembly comprises a planet carrier and three-stage planetary gear sets which are sequentially connected in a transmission mode in the planet carrier, the driving assembly is in transmission connection with an input shaft in the three-stage planetary gear sets, and an output shaft in the three-stage planetary gear sets is in transmission connection with the traction assembly.

Illustratively, the female nail has a through-hole formed at an end thereof remote from the male nail, and the bone extension intramedullary nail device further comprises:

the sealing cap is arranged at the through hole.

Illustratively, the edge side wall of the through hole is provided with a notch.

Illustratively, the cap includes:

a main body portion;

the plugging part is provided with an annular groove, is arranged in the through hole, and is abutted against the female nail and seals the through hole.

Illustratively, the female nail is kept away from a plurality of first fixed orifices have been seted up to one side of son nail, the son nail is kept away from a plurality of second fixed orifices have been seted up to one side of female nail, bone extension intramedullary nail device still includes:

the locking nails are respectively arranged in the first fixing hole and the second fixing hole.

The axis of the first fixing hole and the axis of the cavity are arranged at an included angle; and/or

The axis of the second fixing hole and the axis of the cavity are arranged at an included angle.

Illustratively, the female nail includes:

a first main pipe portion;

the second main pipe portion, first main pipe portion with second main pipe portion is the contained angle setting, the inside of second main pipe portion has been seted up the cavity.

Illustratively, the sub-spike includes:

a first sub-pipe portion;

the second sub-pipe part, first sub-pipe part with the second sub-pipe part is the contained angle setting, the inside of second sub-pipe part has been seted up the cavity.

Illustratively, the drive assembly includes:

the permanent magnet is connected with the speed reducing assembly, and the permanent magnet rotates under the induction of the magnetic pole, transmits torque to the speed reducing assembly and drives the traction assembly to draw the female nails and the sub nails so that the female nails and the sub nails are far away from each other by a preset numerical value.

Illustratively, an end of the deceleration assembly remote from the primary staple is connected to the/'/secondary staple.

In order to achieve the above purpose, the application also provides an electromagnetic intramedullary limb reconstruction system, which is characterized by comprising an external control instrument and the bone extension intramedullary nail device, wherein the external control instrument is used for starting and stopping the driving assembly.

Illustratively, the driving assembly includes a permanent magnet connected to the decelerating assembly, the permanent magnet performing a rotational motion under magnetic pole induction and transmitting a torque to the decelerating assembly, and driving the pulling assembly to pull the female nail and the male nail to be separated from each other by a predetermined value, the external controller includes:

the shell is internally provided with a control assembly;

the two magnetic pole structures are respectively arranged at the left side and the right side of the shell and are electrically connected with the control assembly;

when the shell is aligned with the cavity, and the permanent magnet is positioned between the two magnetic pole structures, the control assembly is started to generate a magnetic field between the two magnetic pole structures, and the permanent magnet performs cutting magnetic induction line movement in the magnetic field and presents a rotating state.

Illustratively, the pole structure is slidably disposed on the housing.

Compared with the prior art, the application has the following technical effects:

the main effect of the speed reducing component is to reduce the torque output by the driving component and drive the pulling component to slowly push the sub-nails away from the main nails (or the main nails and the remote ion nails), so that the wound stimulation of a patient is avoided, meanwhile, the bone growth speed of the patient is avoided, the bone fracture caused by osteoporosis stress of the bone due to too high pulling speed and too long pulling displacement is avoided, and the risk of inappetence and even depression symptoms of the patient is reduced.

More importantly, the bone extension intramedullary nail device can remotely detect and control the driving component to realize accurate traction, has reliable extension process monitoring and control mechanism, and avoids serious complications such as bone nonunion, nerve injury and the like. After the subsequent physician determines that the bone has reached the desired condition, the bone extension intramedullary nail device of the present application is no longer needed and is removed using standard surgical techniques, and the bone is less prone to fracture risk after removal.

It is worth mentioning that medical personnel can be through cloud system external generator prescription to external control appearance, and when the permanent magnet was located between two magnetic pole structures, the permanent magnet was located two magnetic pole structure's magnetic field scope, and external control appearance is according to the removal of electron prescription control two magnetic pole structures according to predetermined direction, and the permanent magnet is cutting magnetic induction line motion this moment to form the rotation, and then produces moment of torsion. The torque is transmitted to the speed reducing assembly, and acts on the traction assembly after being reduced by the speed reducing assembly, so that the convenience of operation is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a bone extension intramedullary nail device according to an embodiment of the present application;

FIG. 2 is a schematic structural view of a bone extension intramedullary nail device in accordance with an embodiment of the present application;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a schematic view of a bone extension intramedullary nail device according to another embodiment of the present application;

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7a is a schematic structural view of a reduction assembly according to an embodiment of the present application;

FIG. 7b is a schematic diagram of an exploded construction of a reduction assembly according to an embodiment of the present application;

FIG. 8 is a schematic view of a bone extension intramedullary nail device according to another embodiment of the present application;

FIG. 9 is a schematic view of a bone extension intramedullary nail device according to yet another embodiment of the present application;

FIG. 10 is a schematic diagram of the structure of an extracorporeal control apparatus according to an embodiment of the present application;

fig. 11 is a dimension marking view of a bone extension intramedullary nail device according to an embodiment of the present application.

Reference numerals:

100. a bone lengthening intramedullary nail device; 10. a female nail; 11. a first main pipe portion; 12. a second main pipe portion; 20. sub-nailing; 21. a first sub-pipe portion; 22. a second sub-pipe portion; 30. a pulling assembly; 31. a screw rod; 32. a guide; 40. a deceleration assembly; 50. a drive assembly; 51. a planet carrier; 52. a planetary gear set; 60. sealing the cap; 61. a main body portion; 62. a blocking part; 70. locking nails; 200. an in vitro controller; 210. a housing; 220. a magnetic pole structure; 301. a cavity; 302. a through port; 303. a notch; 304. a first fixing hole; 305. a second fixing hole; 306. an annular groove.

Detailed Description

The following description of the embodiments of the present application will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

The following describes the technical solution in the embodiment of the present application in detail with reference to the drawings in the embodiment of the present application.

For the distraction osteogenesis technique, the development is attributed to the professor Ilizarov, who has used this method since the 40 th century, and developed external fixators such as ring external fixators and unilateral fixation systems. The stretch-draw osteogenesis technology is based on the theory of tension-stress tissue regeneration and is mainly used for limb extension and bone segment movement. External fixation frames are used for limb extension, pain is the most common complaint of patients, and particularly joint stiffness can be caused in the process of muscle and nerve traction, and osteoporosis stress fracture can occur due to improper application.

Patients also have symptoms of inappetence and even depression in some cases; more importantly, the fracture risk exists in the new bone after the external fixing frame is removed.

In view of this, referring to fig. 1-3 and 10, the present application provides a bone extension intramedullary nail device 100, comprising: a parent staple 10, a child staple 20, a pulling assembly 30, a deceleration assembly 40, and a drive assembly 50;

the female nails 10 and the sub nails 20 are connected with each other and can be close to or far away from each other, and the female nails 10 and the sub nails 20 are provided with cavities 301 which are communicated with each other;

the pulling assembly 30, the speed reducing assembly 40 and the driving assembly 50 are all arranged in the cavity 301, the pulling assembly 30 is connected with the female nails 10 and the male nails 20, the speed reducing assembly 40 is arranged on the pulling assembly 30, and the driving assembly 50 is connected with the speed reducing assembly 40;

wherein, the torque of the driving assembly 50 is transmitted to the decelerating assembly 40, and drives the pulling assembly 30 to pull the female nails 10 and the male nails 20 so that the female nails 10 and the male nails 20 are separated from each other by a predetermined value.

In this embodiment, the bone extension intramedullary nail device 100 of the present application is applicable to femur, humerus, and tibia. A cavity 301 is arranged between the female nail 10 and the male nail 20, and the female nail and the male nail are connected through a traction assembly 30, a speed reduction assembly 40 and a driving assembly 50 which are positioned in the cavity 301, wherein the driving assembly 50 can generate torque and can sequentially transmit the torque to the speed reduction assembly 40 and the traction assembly 30. For example, the driving assembly 50 may be a device with a rotation output function, such as a motor, and the driving assembly 50 may generate a larger torque, so that the speed reducing assembly 40 may be connected to the driving assembly 50, and the speed reducing assembly 40 reduces the rotation speed of the driving assembly 50, so as to avoid the excessively fast displacement speed of the pulling assembly 30.

Because the main nail 10 and the sub-nail 20 are integrally embedded into the bone, when the bone needs to be pulled, the pulling speed has strict requirements, for example, 3 times of pulling every day, the displacement of each pulling is about 0.33mm, and in the process, the speed reducing assembly 40 drives the pulling assembly 30 so as to separate the main nail 10 and the sub-nail 20 from each other, thereby achieving the pulling purpose.

It will be appreciated that in the operation of inserting the bone extension intramedullary nail device 100 of the present application, the female nail 10 and the male nail 20 are respectively fixed to both ends of the bone, and since the middle of the bone is cut off, when the male nail 20 and the female nail 10 are forced away from each other, both ends of the bone are simultaneously moved away from each other by a predetermined amount of displacement (for example, 0.33 mm/time as described above).

It should be noted that, the driving assembly 50 may be a motor, and the motor has a remote control device inside, so that a doctor can remotely control the motor to be turned on or off, and control the speed of each operation of the motor;

of course, the driving assembly 50 may also be a non-power source component, such as a permanent magnet, which is in driving connection with the speed reduction assembly 40, and the permanent magnet may transmit its own torque to the speed reduction assembly 40, and act on the pulling assembly 30 after being decelerated by the speed reduction assembly 40.

When the driving component 50 is a permanent magnet, the rotation of the permanent magnet can be controlled by the external control device 200, specifically, the external control device 200 has a pair of magnetic pole structures 220. When the permanent magnet needs to be controlled to rotate, the magnetic pole structure 220 is arranged at the position right above the permanent magnet, the permanent magnet is positioned between the two magnetic pole structures 220, the permanent magnet is positioned in the magnetic field range of the two magnetic pole structures 220, a doctor can control the two magnetic pole structures 220 to move in a preset direction according to a preset displacement, and at the moment, the permanent magnet makes a cutting magnetic induction line motion and forms autorotation, so that torque is generated. The torque is transferred to the deceleration assembly 40 and acts upon the pulling assembly 30 after being decelerated by the deceleration assembly 40.

In the above structure, the main function of the speed reducing assembly 40 is to reduce the torque output by the driving assembly 50 and drive the pulling assembly 30 to slowly push the sub-nails 20 away from the main nails 10 (or the main nails 10 away from the sub-nails 20), so as to avoid the wound irritation of the patient, and simultaneously avoid the bone growth speed of the patient from being too high and excessively long in pulling displacement, so that the bone is broken due to osteoporosis stress, and the risk of anorexia and depression symptoms of the patient is reduced.

More importantly, the bone extension intramedullary nail device 100 of the present application can remotely detect and control the drive assembly 50 to achieve accurate traction, has reliable extension process monitoring and control mechanisms, and avoids serious complications such as bone nonunion, nerve injury, and the like. After the subsequent physician determines that the bone has reached the desired condition, the bone extension intramedullary nail device 100 of the present application is no longer needed and is removed using standard surgical techniques, and the bone is less prone to fracture risk after removal.

It should be noted that, medical staff can generate an electronic prescription to the external control instrument 200 through the cloud system, when the permanent magnet is located between the two magnetic pole structures 220, the permanent magnet is located within the magnetic field range of the two magnetic pole structures 220, and the external control instrument 200 controls the two magnetic pole structures 220 to move according to the electronic prescription and to move according to a preset direction, and at this time, the permanent magnet makes a cutting magnetic induction line movement and forms autorotation, so as to generate torque. The torque is transmitted to the speed reducing assembly 40, and acts on the pulling assembly 30 after being decelerated by the speed reducing assembly 40, thereby improving the convenience of operation.

Illustratively, the ends of the female nail 10 and the male nail 20 facing each other are opened, and the outer diameter of the male nail 20 is adapted to the inner diameter of the female nail 10, so that the end of the male nail 20 facing the female nail 10 is movably sleeved in the inner tube of the female nail 10.

In this embodiment, the ends of the female nail 10 and the male nail 20 facing each other are all open, and the outer diameter of the male nail 20 can be slightly smaller than the pipe diameter of the female nail 10, so that the open end of the male nail 20 can be inserted into the open end of the female nail 10, and the two can be mutually stretched. The female pin 10 may be secured to the main bone and the male pin 20 may be secured to the bone to be pulled. After the driving assembly 50 in the cavity 301 is started, the torque is transmitted to the pulling assembly 30 after being decelerated by the decelerating assembly 40, and the sub-nails 20 are slowly pushed away from the main nails 10, so that the pulling purpose is realized.

The drawing function is realized through the mode of cup jointing between son nail 20 and the female nail 10, and on the connection structure of both, it is comparatively simple and convenient wholly, avoid equipment complicacy.

Referring to fig. 3-4, the pulling assembly 30 includes:

the screw rod 31 is arranged in the cavity 301, one end of the screw rod 31 is fixedly connected with the female screw 10, the sub-screw 20 can slide relative to the screw rod 31 in the length direction of the screw rod 31, the speed reducing assembly 40 and the driving assembly 50 are arranged on the screw rod 31, and the speed reducing assembly 40 is in threaded transmission connection with the screw rod 31;

the guide piece 32 is in transmission connection with the screw rod 31, and the sub-nail 20 is connected with the guide piece 32;

wherein the driving assembly 50 drives the decelerating assembly 40 and pushes the guide 32 to move the sub-staples 20 away from the parent staples 10.

In this embodiment, in order to realize that the sub-nails 20 and the main nails 10 are far away from each other, the pulling assembly 30 may be connected by adopting a screw 31 transmission structure. Specifically, two ends of the screw rod 31 are respectively connected with the sub-nail 20 and the cavity wall of the cavity 301 inside the female nail 10, in order to facilitate the speed reducing assembly 40 to push the sub-nail 20 away from the female nail 10, one end of the screw rod 31 is fixed on the female nail 10 through a shaft sleeve and other structures, and in the process of rotating the screw rod 31, the screw rod 31 rotates relative to the female nail 10; the guide piece 32 is fixedly connected to the cavity wall of the cavity 301 of the sub-nail 20, and the guide piece 32 is in transmission connection with the screw rod 31, so that when the driving assembly 50 is started, torque is transmitted to the input end of the speed reducing assembly 40, the output end of the speed reducing assembly 40 slowly drives the screw rod 31 to rotate, and the guide piece 32 slowly rotates and is far away from the female nail 10.

It is understood that the guide 32 may be a nut.

Referring to fig. 5-6, the pulling assembly 30, for example, includes:

the screw rod 31 is arranged in the cavity 301, one end of the screw rod 31 is fixedly connected with the female screw 10, the sub-screw 20 can slide relative to the screw rod 31 in the length direction of the screw rod 31, and the speed reducing assembly 40 and the driving assembly 50 are arranged on the screw rod 31 and are in threaded connection with the screw rod 31;

wherein the driving assembly 50 drives the decelerating assembly 40 to displace toward the sub-nails 20 and pushes the sub-nails 20 so as to separate the sub-nails 20 from the parent nails 10.

In this embodiment, in order to realize that the sub-nails 20 and the main nails 10 are far away from each other, the pulling assembly 30 may be connected by adopting a screw 31 transmission structure. Specifically, in order to realize that the sub-nails 20 and the main nails 10 are far away from each other, the pulling assembly 30 may be connected by adopting a screw rod 31 transmission structure. Specifically, one end of the screw rod 31 is fixedly connected with the female screw 10, the other end of the screw rod 31 extends into the cavity 301 of the sub-screw 20, and the sub-screw 20 can slide relative to the screw rod 31. The screw rod 31 positioned in the female screw 10 penetrates through the driving assembly 50 and the speed reducing assembly 40, and the driving assembly 50 and the speed reducing assembly 40 can be in threaded connection with the screw rod 31. When the drive assembly 50 is activated, the drive assembly 50 drives the deceleration assembly 40 to displace toward the sub-staple 20 until the deceleration assembly 40 housing abuts the open end wall of the sub-staple 20 and pushes the sub-staple 20 away from the parent staple 10.

Illustratively, the pulling assembly 30 includes a threaded structure formed on a wall of the cavity 301, the decelerating assembly 40 is threadedly coupled to the threaded structure, and the driving assembly 50 drives the decelerating assembly 40 to displace toward the sub-staple 20 and push the sub-staple 20 to move the sub-staple 20 away from the parent staple 10.

In this embodiment, in order to realize that the sub-nails 20 and the main nails 10 are far away from each other, the pulling assembly 30 may be connected by adopting a screw 31 transmission structure. Specifically, in order to realize that the sub-nails 20 and the main nails 10 are far away from each other, the pulling assembly 30 may be connected by adopting a screw rod 31 transmission structure. A screw structure may be provided on the cavity wall of the cavity 301, and the casing of the speed reducing assembly 40 is screwed with the screw structure, after the driving assembly 50 is started, the driving assembly 50 drives the speed reducing assembly 40 to displace toward the sub-nail 20 until the casing of the speed reducing assembly 40 abuts against the opening end wall of the sub-nail 20, and pushes the sub-nail 20, so that the sub-nail 20 is far away from the main nail 10.

Referring to fig. 3-4 and fig. 7a and 7b, the speed reducing assembly 40 is an exemplary planetary gear reducer, the speed reducing assembly 40 includes a planet carrier 51, and a three-stage planetary gear set 52 sequentially connected in a driving manner in the planet carrier 51, the driving assembly 50 is in driving connection with an input shaft of the three-stage planetary gear set 52, and an output shaft of the three-stage planetary gear set 52 is in driving connection with the pulling assembly 30.

In this embodiment, in order to more precisely drive the sub-nails 20 away from the female nails 10, the speed reducing assembly 40 may employ a planetary gear reducer, which includes a planetary carrier 51 and a three-stage planetary gear set 52 sequentially connected in a driving manner in the planetary carrier 51, and the torque (or rotational speed) of the driving assembly 50 is output as a slower torque (or rotational speed) after passing through the three-stage planetary gear set 52. An output shaft of the planetary gear set 52 may be connected to the screw 31 to drive the screw 31 to rotate. For example, in the above description, two ends of the screw rod 31 are respectively connected with the sub-nail 20 and the cavity wall of the cavity 301 inside the female nail 10, in order to facilitate the speed reducing assembly 40 to push the sub-nail 20 away from the female nail 10, one end of the screw rod 31 is fixed on the female nail 10 through a shaft sleeve and other structures, and in the process of rotating the screw rod 31, the screw rod 31 rotates relative to the female nail 10; the guide piece 32 is fixedly connected to the cavity wall of the cavity 301 of the sub-nail 20, and the guide piece 32 is in transmission connection with the screw rod 31, so that when the driving assembly 50 is started, torque is transmitted to the input end of the three-stage planetary gear set 52, the output end of the three-stage planetary gear set 52 slowly drives the screw rod 31 to rotate, and the guide piece 32 slowly rotates and is far away from the female nail 10.

As described above, one end of the screw rod 31 is fixedly connected with the female screw 10, the other end of the screw rod 31 extends into the cavity 301 of the sub-screw 20, and the sub-screw 20 is slidable relative to the screw rod 31. The screw rod 31 positioned in the female nail 10 penetrates through the driving assembly 50 and the planetary gear reducer, the output ends of the driving assembly 50 and the planetary gear set 52 can be in threaded connection with the screw rod 31, and after the driving assembly 50 is started, the driving assembly 50 drives the planetary gear reducer to move towards the sub-nail 20 until the outer shell of the planetary gear reducer abuts against the opening end wall of the sub-nail 20 and pushes the sub-nail 20 so as to enable the sub-nail 20 to be far away from the female nail 10.

In the above, for example, a screw structure may be provided on the cavity wall of the cavity 301, and the housing of the planetary gear reducer (the planet carrier 51) is screwed with the screw structure, and when the driving assembly 50 is started, the driving assembly 50 drives the planetary gear reducer to displace toward the sub-nail 20 until the housing of the planetary gear reducer abuts against the open end wall of the sub-nail 20, and pushes the sub-nail 20 so as to separate the sub-nail 20 from the parent nail 10.

Referring to fig. 7b, each of the planetary gear sets 52 may be formed by connecting a carrier, three planetary gears and a sun gear, and the axes of the three planetary gears of each of the planetary gear sets 52 are correspondingly coincident with each other and are in driving connection with each other.

Referring to fig. 1-2, an exemplary end of the female pin 10 remote from the male pin 20 is provided with a through hole 302, and the bone extension intramedullary pin device 100 further includes:

a sealing cap 60, wherein the sealing cap 60 is arranged at the through hole 302.

In this embodiment, to avoid bone growth to cover the bone extension intramedullary nail device 100 of the present application, a through hole 302 may be formed at the end of the female nail 10 distal to the male nail 20, and a sealing cap 60 may be provided at the position of the through hole 302.

Illustratively, a notch 303 is formed on the edge sidewall of the through hole 302.

In this embodiment, in order to facilitate the medical personnel to perform surgery to install the bone extension intramedullary nail device 100 of the present application, a notch 303 needs to be formed in the edge sidewall of the through hole 302, so as to facilitate left and right positioning and installation of other surgical tools.

Illustratively, the cap 60 includes:

a main body 61;

the plugging part 62, an annular groove 306 is formed in the plugging part 62, the plugging part 62 is arranged in the through hole 302, and the main body part 61 abuts against the female nail 10 and closes the through hole 302.

As an alternative embodiment, the main body 61 of the cap 60 is provided with a blocking portion 62, the blocking portion 62 is provided with a ring groove, and a sealing structure may be disposed in the ring groove 306, so that the blocking portion 62 is sealed and disposed in the through hole 302.

Illustratively, a plurality of first fixing holes 304 are formed on a side of the female nail 10 away from the male nail 20, a second fixing hole 305 is formed on a side of the male nail 20 away from the female nail 10, and the bone extension intramedullary nail device 100 further includes:

the plurality of locking nails 70 are respectively arranged in the first fixing hole 304 and the second fixing hole 305.

In this embodiment, in order to facilitate fixing the sub-nail 20 and the main nail 10 on the bone, a plurality of first fixing holes 304 may be formed on one side of the main nail 10 away from the sub-nail 20, a second fixing hole 305 may be formed on one side of the sub-nail 20 away from the main nail 10, and locking nails 70 may be disposed in the first fixing holes 304 and the second fixing holes 305 correspondingly. After the medical staff embeds the sub-nails 20 and the main nails 10 into the bones, the locking nails 70 are used for respectively fixing the bones, the sub-nails 20 and the main nails 10, so that the sub-nails 20 and the main nails 10 are prevented from loosening in the subsequent traction process.

Illustratively, the axis of the first fixing hole 304 forms an included angle with the axis of the cavity 301; and/or

The axis of the second fixing hole 305 and the axis of the cavity 301 form an included angle.

In this embodiment, the first fixing hole 304 and/or the second fixing hole 305 may be disposed at an included angle with respect to the axis of the cavity 301, that is, the first fixing hole 304 and/or the second fixing hole 305 are disposed obliquely, so that the medical staff can dispose the locking nail 70 obliquely according to the shape of the bone.

For another example, for some bones having included angles, the sub-nail 20 and the main nail 10 may be fixed through the inclined first fixing hole 304 and/or the second fixing hole 305, respectively, and the sub-nail 20 may be stably driven away from the main nail 10 during the pulling process when the bone extension intramedullary nail device 100 of the present application is applied.

Referring to fig. 8, the female nail 10 includes:

a first main pipe portion 11;

the second main pipe portion 12, the first main pipe portion 11 and the second main pipe portion 12 are disposed at an included angle, and the cavity 301 is formed in the second main pipe portion 12.

In this embodiment, in order to facilitate fixing bones with an included angle, the female nail 10 may be configured to be composed of a first female pipe portion 11 and a second female pipe portion 12, and the first female pipe portion 11 and the second female pipe portion 12 are disposed at an included angle, so that medical staff can set the included angle between the first female pipe portion 11 and the second female pipe portion 12 according to the shape of the bones.

For another example, for some bones having an included angle, the sub-nails 20 and the main nails 10 may be fixed by adjusting the included angle between the first main tube portion 11 and the second main tube portion 12 when the bone extension intramedullary nail device 100 of the present application is applied, and the sub-nails 20 may be stably driven away from the main nails 10 during the pulling process.

Referring to fig. 9, the sub-nail 20 includes:

a first sub-pipe portion 21;

the second sub-pipe portion 22, the first sub-pipe portion 21 and the second sub-pipe portion 22 are disposed at an included angle, and the cavity 301 is formed in the second sub-pipe portion 22.

In this embodiment, in order to facilitate fixing bones with an included angle, the sub-nail 20 may be configured to be composed of a first sub-tube portion 21 and a second sub-tube portion 22, and the first sub-tube portion 21 and the second sub-tube portion 22 are disposed at an included angle, so that a medical staff can set an included angle between the first sub-tube portion 21 and the second sub-tube portion 22 according to the shape of the bones.

For another example, for some bones having an included angle, the sub-nail 20 and the main nail 10 may be fixed by adjusting the included angle between the first sub-tube portion 21 and the second sub-tube portion 22, and the sub-nail 20 may be stably driven away from the main nail 10 during the pulling process when the bone extension intramedullary nail device 100 of the present application is applied.

Illustratively, the drive assembly 50 includes:

and a permanent magnet connected with the speed reducing assembly 40, wherein the permanent magnet performs a rotary motion under the induction of magnetic poles, transmits a torque to the speed reducing assembly 40, and drives the pulling assembly 30 to pull the female nails 10 and the male nails 20 so as to separate the female nails 10 and the male nails 20 from each other by a predetermined value.

In this embodiment, the driving assembly 50 may use a permanent magnet, and the rotation of the permanent magnet may be controlled by the external control device 200, specifically, the external control device 200 has a pair of magnetic pole structures 220. When the permanent magnet needs to be controlled to rotate, the magnetic pole structure 220 is arranged at the position right above the permanent magnet, the permanent magnet is positioned between the two magnetic pole structures 220, the permanent magnet is positioned in the magnetic field range of the two magnetic pole structures 220, a doctor can control the two magnetic pole structures 220 to move in a preset direction according to a preset displacement, and at the moment, the permanent magnet makes a cutting magnetic induction line motion and forms autorotation, so that torque is generated. The torque is transferred to the deceleration assembly 40 and acts upon the pulling assembly 30 after being decelerated by the deceleration assembly 40.

Illustratively, an end of the deceleration assembly 40 remote from the female staple 10 is coupled to the male staple 20.

In this embodiment, the decelerating assembly 40 is connected to the sub-nails 20 in an initial state, and after the driving assembly 50 is started, the driving assembly 50 drives the decelerating assembly 40 to move toward the sub-nails 20 and push the sub-nails 20 so as to separate the sub-nails 20 from the main nails 10.

Referring to fig. 10, the present application further provides an electromagnetic intramedullary limb reconstruction system, which includes an external control device 200 and the bone extension intramedullary nail device 100 described above, wherein the external control device 200 is used for opening and closing the driving assembly 50. The specific structure of the bone extension intramedullary nail device 100 refers to the above embodiment, and since the electromagnetic intramedullary limb reconstruction system adopts all the technical solutions of all the embodiments, at least has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.

Illustratively, the driving assembly 50 includes a permanent magnet coupled to the decelerating assembly 40, the permanent magnet performing a rotational motion under magnetic pole induction and transmitting torque to the decelerating assembly 40, and driving the pulling assembly 30 to pull the female nails 10 and the male nails 20 away from each other by a predetermined value, and the external control device 200 includes:

a housing 210, wherein a control assembly is arranged in the housing 210;

two magnetic pole structures 220 respectively disposed on the left and right sides of the housing 210 and electrically connected to the control assembly;

when the housing 210 is aligned with the cavity 301 and the permanent magnet is located between the two magnetic pole structures 220, the control assembly is started to generate a magnetic field between the two magnetic pole structures 220, and the permanent magnet performs a cutting induction line motion in the magnetic field and presents a rotation state.

In this embodiment, when the driving assembly 50 is a permanent magnet, the rotation of the permanent magnet can be controlled by the external control device 200, specifically, a pair of magnetic pole structures 220 are provided outside the external control device 200, the two magnetic pole structures 220 are respectively disposed on the left and right sides of the housing 210, and the control assembly inside the housing 210 can control the magnetic pole structures 220 to be electrified and to generate a magnetic field. When the permanent magnet needs to be controlled to rotate, the magnetic pole structure 220 is arranged at the position right above the permanent magnet, the permanent magnet is positioned between the two magnetic pole structures 220, the permanent magnet is positioned in the magnetic field range of the two magnetic pole structures 220, a doctor can control the two magnetic pole structures 220 to move in a preset direction according to a preset displacement, and at the moment, the permanent magnet makes a cutting magnetic induction line motion and forms autorotation, so that torque is generated. The torque is transferred to the deceleration assembly 40 and acts upon the pulling assembly 30 after being decelerated by the deceleration assembly 40.

Illustratively, the pole structure 220 is slidably disposed on the housing 210.

In this embodiment, the magnetic pole structures 220 can be slidably disposed on the housing 210, the control assembly can control the displacement of the magnetic pole structures 220, the medical staff can generate the prescription to the control assembly through the external generator of the cloud system, when the permanent magnet is disposed between the two magnetic pole structures 220, the permanent magnet is disposed within the magnetic field range of the two magnetic pole structures 220, the external control instrument 200 controls the two magnetic pole structures 220 to move according to the electronic prescription in a predetermined direction, and at this time, the permanent magnet performs the cutting magnetic induction line movement and forms autorotation, thereby generating torque. The torque is transmitted to the speed reducing assembly 40, and acts on the pulling assembly 30 after being decelerated by the speed reducing assembly 40, thereby improving the convenience of operation.

Referring to fig. 11, in order to facilitate understanding of the technical effects of the bone extension intramedullary nail device 100 of the present application, the following parameters may be selected for the material indexes of the female nail 10 and the male nail 20 of the present application:

1. performance index

1.1 hardness: not less than 260HV10;

two surface quality

2.1 surface defects: the surface of the product must have a discontinuity defect.

2.2 surface roughness: the Ra value of the product surface roughness should be no greater than the specifications of table 1.

TABLE 1 surface roughness (Ra) values (units: micrometers)

Material	Smooth outer surface	Hole, thread and groove	The rest are
				Titanium alloy	0.8	3.2	1.6

2.3 appearance: the product surface should be smooth and clean, and should not have defects such as dents, cracks, ridges, burrs, attachments, etc

3. Size of the device

2.3.1 the dimensions of the diameters d, d1, and lengths L, L1, L2 of the female nail 10 should meet the specifications of table 2.

Table 2 the main nail of the electromagnetic intramedullary nail limb reconstruction system has a unit of size of millimeter

3. The matching performance is as follows:

3.1 the main nails 10 and the sub nails 20 should rotate smoothly, and the phenomenon of over-loosening or over-tightening cannot occur.

3.2 the locking pin 70, the sealing cap 60 and the main pin have good matching performance, and cannot be too loose or too tight.

3.3 the external control instrument should move freely when rotating, and no blocking phenomenon exists.

4. Electromagnetic properties

Voltage: 220V 50Hz; current flow: 2.3A; power: 75W

Delivery status: a non-sterile state or a sterile state. The sterilized state product should be sterile.

Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.

The above description of the preferred embodiments of the present application should not be taken as limiting the scope of the application, but rather should be understood to cover all modifications, variations and adaptations of the present application using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present application to other relevant arts and technologies.

Claims

1. A bone extension intramedullary nail device, comprising: the device comprises a main nail, a sub-nail, a traction assembly, a speed reducing assembly and a driving assembly;

2. The bone extension intramedullary nail device of claim 1, wherein the female nail and the male nail are open at one end thereof facing each other, and wherein an outer diameter of the male nail is adapted to an inner diameter of the female nail such that an end of the male nail facing the female nail is movably sleeved in an inner tube of the female nail.

3. The bone extension intramedullary nail device of claim 1, wherein the pulling assembly comprises:

4. The bone extension intramedullary nail device of claim 1, wherein the pulling assembly comprises:

the driving assembly drives the speed reducing assembly to move towards the sub-nails and pushes the sub-nails to enable the sub-nails to be far away from the mother nails.

5. The bone extension intramedullary nail device of claim 1, wherein the pulling assembly includes a threaded structure formed on a wall of the cavity, the deceleration assembly is threadably coupled to the threaded structure, and the drive assembly drives the deceleration assembly toward the sub-nail and pushes the sub-nail away from the main nail.

6. The bone extension intramedullary nail device of claim 1, wherein the reduction assembly is a planetary gear reducer, the reduction assembly comprises a planet carrier, and a tertiary planetary gear set in turn drivingly connected within the planet carrier, the drive assembly is drivingly connected with an input shaft in the tertiary planetary gear set, and an output shaft in the tertiary planetary gear set is drivingly connected with the pulling assembly.

7. The bone extension intramedullary nail device of claim 1, wherein an end of the female nail distal to the male nail is vented, the bone extension intramedullary nail device further comprising:

the sealing cap is arranged at the through hole.

8. The bone extension intramedullary nail device of claim 7, wherein a marginal sidewall of the port is notched.

9. The bone extension intramedullary nail device of claim 7, wherein the cap comprises:

a main body portion;

10. The bone extension intramedullary nail device of claim 1, wherein a plurality of first fixation holes are provided on a side of the female nail away from the male nail, and a second fixation hole is provided on a side of the male nail away from the female nail, the bone extension intramedullary nail device further comprising:

11. The bone extension intramedullary nail device of claim 10, wherein an axis of the first fixation hole is disposed at an angle to an axis of the cavity; and/or

12. The bone extension intramedullary nail device of claim 1, wherein the female nail comprises:

a first main pipe portion;

13. The bone extension intramedullary nail device of claim 1, wherein the sub-nail comprises:

a first sub-pipe portion;

14. The bone extension intramedullary nail device of any one of claims 1-13, wherein the drive assembly comprises:

15. The bone extension intramedullary nail device of claim 4 or 5, wherein an end of the deceleration assembly remote from the female nail is coupled to the male nail.

16. An electromagnetic intramedullary limb reconstruction system comprising an external control device for opening and closing the drive assembly, and a bone extension intramedullary nail device according to any one of claims 1 to 15.

17. The electromagnetic intramedullary limb reconstruction system according to claim 16, wherein the drive assembly includes a permanent magnet coupled to the deceleration assembly, the permanent magnet being in rotational motion under magnetic pole induction and transmitting torque to the deceleration assembly and driving the pulling assembly to pull the primary and secondary nails away from each other by a predetermined amount, the extracorporeal control apparatus comprising:

the shell is internally provided with a control assembly;

18. The electromagnetic intramedullary limb reconstruction system of claim 17, wherein the pole structure is slidingly disposed on the housing.