Pole end pedicle screw combiner and spine stabilizing device

Abstract

The invention discloses a rod end pedicle screw connector and a spine stabilizing device, and the connector comprises a first maintaining part which is provided with a cylindrical cavity, a main accommodating groove and an extrusion cavity; the second retaining part is arranged in the columnar cavity and is fixed with the rod-shaped part; the main gland is screwed with the upper cavity wall of the columnar cavity; a first sub-gland for pressing the second holding member; the wrapping part is arranged in the extrusion cavity and used for clamping the ball head of the screw; a force transmission part is arranged between the wrapping part and the main gland and used for transmitting pressure applied by the main gland to the wrapping part. An elastic component is arranged in the columnar cavity and is provided with a first combining end and a second combining end, and the two combining ends are allowed to be close to or far away from each other and the first combining end is allowed to swing in any direction relative to the second combining end through elastic deformation; the first combination end is fixedly connected to the second holding part, and the second combination end is fixedly connected to the first holding part or the force transmission part.

Description

TECHNICAL FIELD

[0001] The present application relates to an apparatus for correcting and stabilizing a spine, and more particularly to a rod tip pedicle screw coupler and a spinal stabilization device. BACKGROUND

[0002] A spinal stabilization device (system) is used to correct a deformation of an entire spine or a partial segment of a spine caused by a bone disease or an injury (e.g., a spinal curvature caused by osteoarthritis, ankylosing spondylitis, or a fracture of a vertebra of several segments of a spine caused by a trauma) to stabilize the spine in a normal form and a physiological curve.

[0003] A spinal stabilization device (system) generally includes a rod member, pedicle screws for being screwed into the posterior side of a vertebra, and a coupler for connecting the pedicle screws in series to the rod member; the coupler serves as a connection medium member to connect the pedicle screws screwed into the posterior side of the vertebra to the rod member, so that the rod member supports the spine.

[0004] In a conventional spinal stabilization device (system), the coupler is fixedly connected to the rod member, and specifically, the coupler includes a retaining member and a gland, a tail of the pedicle screw is formed at a bottom of the retaining member, the retaining member has a receiving groove extending downward from a top and radially therethrough, the rod member is received by the receiving groove, and the gland is screwed into the retaining member to press the rod member, thereby fixing the coupler to the rod member. Since the rod member is generally a rigid rod and the coupler is fixedly connected to the rod member, the spinal stabilization device (system) of this structure type basically supports the spine rigidly, and this type of spinal stabilization device (system) can be referred to as a rigid spinal stabilization device (system), which can completely inhibit the mobility of the vertebra by fixing the rod member to the coupler, and thus has a significant advantage in correcting the posture of a problem vertebra and reconstructing a physiological curve of a spinal segment in which the problem vertebra is located.

[0005] However, the rigid spinal stabilization device (system) has the following adverse effects on the normal vertebrae adjacent to the end vertebrae with problems when correcting the vertebrae with problems: on the one hand, if the normal vertebrae adjacent to the end vertebrae with problems are also supported by the rod member, the activity of the adjacent normal vertebrae can be lost due to the long-term complete inhibition of the activity of the adjacent normal vertebrae, thereby resulting in the activity of the vertebrae needing a long time to recover after the stabilization device (system) is removed; on the other hand, the activity of all the vertebrae supported by the stabilization device (system) is completely inhibited, and thus the lost activity of all the supported vertebrae is mainly compensated by the intervertebral discs of the vertebrae adjacent to the end vertebrae supported, thereby possibly resulting in the damage or failure of the intervertebral discs corresponding to the adjacent vertebrae, especially when the number of the vertebrae completely inhibited is large, the possibility of the damage or failure of the intervertebral discs corresponding to the adjacent vertebrae is greater.

[0006] To overcome the above-mentioned defects of the spinal stabilization device (system) when correcting the vertebrae, the prior art provides a dynamic spinal stabilization device (system) which allows a certain segment of the vertebrae (e.g., the normal vertebrae adjacent to the end vertebrae with problems) to have a certain activity when being supported by the rod member, and for this purpose, the prior art makes the following improvements to the traditional coupling: an upper matching member and a lower matching member are additionally arranged in the retaining member, the upper matching member and the lower matching member are slidingly matched by a cylindrical surface or a spherical surface, a gland is used to press the rod member against the upper matching member, and the sliding matching between the upper matching member and the lower matching member allows the coupling to pivot in the sagittal plane relative to the rod member, thereby providing a certain activity for the vertebrae.

[0007] However, the above-mentioned stabilization device (system) still has the following problems: 1. After the spinal stabilization system is implanted, the driving ability of the muscle tissue near the spine is reduced, especially the muscle tissue is difficult to reset the vertebrae after the vertebrae is pivoted (pitched or pitched) in the sagittal plane, and the above-mentioned coupling only has the function of allowing the vertebrae to pivot by the cylindrical surface or spherical surface matching, and does not contribute to the reset of the pivoted (pitched or pitched) vertebrae, and even the friction between the two matching members also inhibits the reset of the vertebrae, which is easy to cause muscle involvement.

[0008] 2. In some couplings allowing the spatial angle of the pedicle screw to be adjusted, the locking after the adjustment of the pedicle screw relies on the pressure applied by the two matching members on the covering sleeve of the ball head for covering the bone screw, which results in: if the bone screw needs to be locked, the pressure between the two matching members is increased, and thus the friction between the two is increased, thereby resulting in the damping for inhibiting the activity of the vertebrae being significantly increased, and even the activity is completely inhibited, and if the pressure is reduced to reduce the damping for inhibiting the activity of the vertebrae, the bone screw can not be stably locked.

[0009] To solve the above problems of the dynamic spinal column device, the applicant's previous patent (patent publication number: CN117717404A) provides a bone screw coupler and a spinal column stabilization system, wherein the coupler includes a first retaining component and a second retaining component, the second retaining component is arranged in the first retaining component, the second retaining component has a main body part and a coupling part below the main body part, a rod-shaped component is received by a second accommodating groove on the main body part and is fixed on the main body part by a second gland, a first gland is arranged above the second gland and is screwed with a columnar cavity of the first retaining component, an elastic part is arranged between the main body part and the coupling part, the elastic part is two elastic bending plates arranged symmetrically about a vertical plane (coronal plane) orthogonal to a sagittal plane, the middle part of the two elastic bending plates has an inwardly curved inner convex region, when the first gland is screwed to press against the second gland so that the rod-shaped component abuts against the groove bottom of the first accommodating groove of the first retaining component, the rod-shaped component is fixed, the elastic bending plates are elastically compressed, and when the first gland is unscrewed, the elastic bending plates reset and the rod-shaped component moves upward, thereby allowing the rod-shaped component to pivot under the elastic damping provided by the elastic bending plates, thereby allowing the corresponding vertebrae to pitch (pivot) under the elastic damping, and after pitching, the active reset is realized by the elastic reset of the elastic bending plates. In addition, a separation component with a push disc is arranged below the coupling part of the second retaining component, the push disc is screwed with the first retaining component, and by screwing the push disc, the cover component for clamping the ball head of the bone screw can be pressed, thereby avoiding the locking of the bone screw by pressing the cover component with the coupling part of the second retaining component, so that when the rod-shaped component is in a released state allowing pivoting, the bone screw cannot be stably locked due to the released state of the rod-shaped component.

[0010] However, the above-mentioned bone screw coupler and spinal column stabilization system has the following problems when in use: 1. The elastic part composed of two symmetrically arranged elastic bending plates can only meet the requirement of the pivoting of the vertebrae in the sagittal plane, and it is difficult to meet the requirement of the pivoting of the vertebrae in the coronal plane and the transverse plane.

[0011] 2. The internal stress caused by the deformation of the elastic bending plates due to the movement of the vertebrae is concentrated in the small area of the inner convex region, thereby easily causing elastic deformation failure and elastic reset failure in the area.

[0012] 3. When the angle of the bone screw relative to the coupler needs to be adjusted, the second retaining component and the rod-shaped component in the first retaining component must be removed first to adjust the angle of the bone screw by unscrewing the push disc, thereby the operation of adjusting the angle of the bone screw is complex and affects the original correction form. SUMMARY

[0013] In view of the above technical problems existing in the prior art, the present application provides a rod end pedicle screw coupler and a spinal column stabilization device.

[0014] To solve the above technical problems, the technical scheme adopted by the present application is: A rod tip pedicle screw coupler, comprising: A first holding component having a cylindrical cavity and a main accommodating groove for receiving a rod-shaped component and having a width greater than the diameter of the rod-shaped component, and an extrusion cavity located below the cylindrical cavity; A second holding component arranged in the cylindrical cavity and fixed with the rod-shaped component; A main gland screwing with the upper cavity wall of the cylindrical cavity; A first auxiliary gland for pressing the second holding component; A covering component arranged in the extrusion cavity and defining a spherical cavity for covering the ball head of the pedicle screw, the extrusion cavity forcing the spherical cavity to clamp the ball head by pressing the covering component; wherein: A force transmission component is arranged between the covering component and the main gland, and the force transmission component is used to transmit the pressure applied by the main gland to the covering component; An elastic component is arranged in the cylindrical cavity, and the elastic component is configured to have a first coupling end and a second coupling end in the axial direction, and by elastic deformation, the first coupling end is allowed to approach or move away from each other and to swing in any direction relative to the second coupling end; The first coupling end is fixedly connected to the second holding component, and the second coupling end is fixedly connected to the first holding component or the force transmission component.

[0015] Preferably, the elastic component includes an outer cylinder segment and an inner cylinder segment formed by reversely bending the elastic wall radially outward or radially inward and integrally connected at the bottom by a bending segment, the upper end of the inner cylinder segment as the first coupling end, and the upper end of the outer cylinder segment as the second coupling end.

[0016] Preferably, the middle and lower parts of the inner cylinder segment, the middle and lower parts of the outer cylinder segment, and the bending segment form an elastic deformation segment by reducing the thickness.

[0017] Preferably, a circumferentially arranged slit is formed in the area where the elastic deformation segment is located.

[0018] Preferably, the force transmission component includes a base and two opposite driven arms formed on the base, and the rod-shaped component passes through the gap between the two driven arms; the driven arms extend axially upward in the cylindrical cavity, through the annular gap between the outer peripheral surface of the first holding component and the cavity wall of the cylindrical cavity, and to the bottom of the main gland.

[0019] Preferably, a through-thread hole is formed in the middle region of the main gland, the first auxiliary gland is screwed in the thread hole, and the first auxiliary gland is screwed to press against the second retaining part.

[0020] Preferably, the first connecting end of the elastic part is fixedly connected to the bottom of the second retaining part, and the second connecting end of the elastic part is connected to the force transmission part.

[0021] Preferably, the bottom of the second retaining part is configured as a cylindrical connecting part, the first connecting end is sleeved on the cylindrical connecting part, a circumferentially extending positioning groove is formed in the sidewall of the lower part of the driven arm, a stepped surface is formed above the positioning groove, the second connecting end is formed with a flange plate, the flange plate is slid from one side of the gap into the positioning groove, a fastener is screwed from the stepped surface and penetrates the flange plate to fix the flange plate.

[0022] Preferably, a secondary accommodating groove is formed in the top of the second retaining part, the secondary accommodating groove is opposite to the circumferential position of the primary accommodating groove, the secondary accommodating groove has a cylindrical groove bottom matched with the outer circumferential surface of the rod-shaped part, the secondary accommodating groove is used for receiving the rod-shaped part, a second auxiliary gland for pressing against the rod-shaped part is screwed on the top of the second retaining part, and the first auxiliary gland is used for pressing against the second auxiliary gland.

[0023] Preferably, a plurality of support columns are circumferentially arranged on the first auxiliary gland and can elastically extend and elastically retract at the bottom of the first auxiliary gland.

[0024] The application further discloses a spinal column stabilizing system, which comprises a rod-shaped part and a pedicle screw, and further comprises the rod end-pedicle screw connector.

[0025] Compared with the prior art, the rod end-pedicle screw connector and the spinal column stabilizing system have the following beneficial effects: 1. The connector allows the normal vertebrae adjacent to the end problem vertebra to have a certain degree of movement in the sagittal plane, the coronal plane and the transverse plane under elastic damping, so that the spinal column stabilizing system can form specific and excellent dynamic support for the normal vertebrae adjacent to the end problem vertebra.

[0026] 2、the elastic component provided by the present application has excellent stress concentration resistance and elastic fatigue resistance due to the inner cylinder segment, the outer cylinder segment, the bending segment and the two combined ends on the same side, thus the spine stabilization system provided by the present application has better dynamic support effect on the vertebrae after long-term and frequent activities of the end vertebrae.

[0027] 3、the coupler provided by the present application can lock the bone nail without disassembling the related components such as the rod-shaped component and can switch the fixing / release state of the rod-shaped component while ensuring that the bone nail is always in the locked state by adding the force transmission component and the first secondary gland cover screwed in the main gland cover.

[0028] 4、other advantages of the present application are directly or implicitly described in the specific embodiments of the specification.

[0029] The summary of various implementations or examples of the technology described in the present application is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0030] In the drawings, which are not necessarily drawn to scale, like numerals can describe similar components in different views. Like numerals having different letter suffixes can represent different instances of similar components. The drawings illustrate generally, by way of example, various embodiments of the application and are not intended to limit the application. The same reference numerals in different drawings signify the same or similar components. Such embodiments of the inventive application can be employed as examples without departing from the scope of the application. The following detailed description is made with reference to the accompanying drawings.

[0031] Figure 1 The perspective structural schematic view of the spine stabilization device provided by the embodiments of the present application.

[0032] Figure 2 The perspective exploded view of the coupler provided by the embodiments of the present application.

[0033] Figure 3 The perspective sectional view of the coupler provided by the embodiments of the present application.

[0034] Figure 4 The assembly relationship view between the second retaining component, the force transmission component and the elastic component.

[0035] Figure 5 The assembly relationship view between the force transmission component and the elastic component.

[0036] Figure 6 The perspective structural schematic view of the elastic component.

[0037] Figure 7 is a main sectional view of the elastic member.

[0038] Figure 8 is a state view of the spinal column stabilizing device provided by the embodiment of the present application when calibrating the spinal column.

[0039] Reference Signs: 10 - first holding member; 11 - cylindrical cavity; 12 - main accommodating groove; 121 - V-shaped groove bottom; 13 - extrusion cavity; 14 - positioning groove; 20 - second holding member; 21 - sub-accommodating groove; 30 - covering member; 31 - elastic arm; 32 - spherical cavity; 41 - main pressure cover; 411 - driven operation groove; 412 - threaded hole; 42 - first sub-pressure cover; 421 - driven operation groove; 422 - support column; 43 - second sub-pressure cover; 431 - driven operation groove; 50 - force transmission member; 51 - base; 511 - embedding groove; 512 - stepped surface; 52 - driven arm; 53 - positioning protrusion; 54 - gap; 55 - operation hole; 60 - elastic member; 61 - first joint end; 62 - second joint end; 621 - flange plate; 63 - elastic wall; 64 - bending section; 65 - slit; 66 - elastic deformation section; 67 - inner cylinder section; 68 - outer cylinder section; 100 - jointer; 200 - bone nail; 201 - spherical head; 202 - driven operation groove; 300 - rod-shaped member; 400 - normal vertebra. DETAILED DESCRIPTION

[0040] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meaning as understood by a person having ordinary skill in the art to which the present application pertains. The terms "first", "second", and similar terms are used herein to distinguish one element from another, but do not necessarily require or imply these elements to be in any specified order or sequence. The terms "comprises", "comprising", "includes", "including" and the like can be used herein to indicate that an element or object possess the element or object listed after such terms in the same group or list or to indicate a list includes one or more elements or objects. The terms "connected", "coupled", "connected", or "coupled" and the like can be used herein to indicate an electrical connection, whether direct or indirect, between two or more elements or objects, and can encompass the presence of one or more intervening, intermediate, and / or interposing elements or objects. The terms "upper", "lower", "left", "right", and the like are used herein only to represent relative positions, and when the absolute positions of the described objects are changed, the relative positions can also be changed accordingly.

[0041] In order to keep the following description of the embodiments of the present application clear and concise, the present application omits detailed description of known functions and known components.

[0042] As Figure 1 and in combination Figure 8As shown, embodiments of the present invention disclose a connector 100 and a spinal stabilization device including the connector 100. The spinal stabilization device further includes a pedicle screw (hereinafter referred to as a bone screw 200) for screwing into the posterior side of the vertebra of the spine and a rod-shaped component 300 for supporting, correcting and stabilizing.

[0043] In the spinal stabilization device disclosed in this invention, at least at the end of its rod-shaped component 300, a connector 100 provided by this invention is arranged. This connector 100 is used to connect bone screws 200, screwed into normal vertebrae 400 (one or more normal vertebrae 400) adjacent to the problem vertebra at the end, to the rod-shaped component 300. This allows the rod-shaped component 300 to provide a certain degree of support to the normal vertebrae 400 while also allowing for a certain degree of mobility. The connector 100 provided by this invention is particularly suitable for placement at positions corresponding to vertebrae in the cervical spine segment (C1-C7 segment), thereby providing sufficient in-plane mobility for the vertebrae in that segment. The connector 100 provided by this invention can also be placed in other sections of the rod-shaped component 300 corresponding to the problem vertebra, whereby the connector 100 is adjusted to be fixed to the rod-shaped component 300, thereby providing rigid support to the problem vertebra.

[0044] like Figures 2 to 7 As shown, the connector 100 provided by the present invention includes: a first retaining member 10, a second retaining member 20, a covering member 30, an elastic member 60, a force transmitting member 50, a main pressure cap 41, a first auxiliary pressure cap 42, and a second auxiliary pressure cap 43.

[0045] like Figure 2 and Figure 3 and combined Figure 1As shown, an axially extending cylindrical cavity 11 is formed in the top of the first holding component 10, and an extrusion cavity 13 is formed in the bottom of the cylindrical cavity 11 and penetrates the bottom of the first holding component 10, the cavity wall of the cylindrical cavity 11 and the outer circumferential surface of the first holding component 10 define a holding wall (or the cylindrical cavity 11 is surrounded by the holding wall), an axially extending main accommodating groove 12 is formed in the top of the first holding component 10, and the main accommodating groove 12 penetrates the holding wall of the first holding component 10 in the radial direction, thus, the main accommodating groove 12 is formed on the entity of the holding wall and has two opposite V-shaped groove bottoms 121 formed by two inclined surfaces in the circumferential direction, in the spinal correction surgery, the rod-shaped component 300 is simultaneously received by the two main accommodating grooves 12 by entering the top of the first holding component 10 from the two main accommodating grooves 12, and the fixation of the rod-shaped component 300 and the first holding component 10 is achieved by pressing the rod-shaped component 300 in the section between the two main accommodating grooves 12 so that the cylindrical surface of the rod-shaped component 300 simultaneously abuts on the V-shaped groove bottoms 121 of the two main accommodating grooves 12, the rod-shaped component 300 can be released by removing the pressure on the rod-shaped component 300 and making the rod-shaped component 300 away from the V-shaped groove bottoms 121, thus allowing the first holding component 10 (relative to the rod-shaped component 300) to move at least in the plane where the two main accommodating grooves 12 are located, that is, in the sagittal plane. In the present application, the width of the main accommodating groove 12 is greater than the diameter of the rod-shaped component 300, so that after the rod-shaped component 300 is released, the first holding component 10 is allowed to move in any plane including the sagittal plane, the coronal plane and the transverse plane.

[0046] As Figure 3 and Figure 4 and in combination with Figure 2As shown, the outer circumferential surface of the second holding member 20 is a cylindrical surface, and the second holding member 20 is located in the cylindrical cavity 11 of the first holding member 10. A sub-receiving groove 21 is formed in the top of the second holding member 20, the sub-receiving groove 21 penetrates the second holding member 20 radially, and the sub-receiving groove 21 is opposite to the two main receiving grooves 12 in the circumferential direction, so that the rod-shaped member 300 enters the main receiving groove 12 at the same time, and is also received by the sub-receiving groove 21. The bottom of the second receiving groove is configured as a cylindrical surface with a diameter equal to that of the rod-shaped member 300. The outer circumferential surface of the upper part of the second holding member 20 is machined with external threads, the edge of the second sub-gland 43 has a sidewall machined with internal threads, and the second sub-gland 43 is screwed onto the top of the second holding member 20 by the cooperation of the internal threads and the external threads, and the center of the bottom of the second sub-gland 43 has a boss, when the second sub-gland 43 is screwed downward relative to the second holding member 20, the boss presses against the top of the rod-shaped member 300, so that the lower part of the rod-shaped member 300 abuts against the groove bottom of the sub-receiving groove 21, thereby fixing the rod-shaped member 300 and the second holding member 20. The regular hexagonal (octagonal) structure machined on the edge of the second sub-gland 43 for the force applying tool to screw can also be a regular hexagonal driven operation groove 431 machined in the middle area of the upper surface of the second sub-gland 43 as shown. Figure 4 In the present application, the cylindrical surface enveloped by the second holding member 20 (including the radial dimension occupied by the second sub-gland 43) has a certain annular gap with the cylindrical cavity 11 of the first holding member 10, so as to reserve sufficient movement amount for the first holding member 10 relative to the rod-shaped member 300 and the second holding member 20.

[0047] As shown in Figure 3 and Figure 4 The cladding member 30 is placed in the extrusion cavity 13 below the cylindrical cavity 11 of the first holding member 10, the cladding member 30 has a main body part in the upper part in the shape of a flat column, and a cladding part integrally formed at the bottom of the main body part, the cladding part includes a plurality of elastic arms 31 arranged in the circumferential direction, the elastic arms 31 enclose a spherical cavity 32 with an entrance in the lower part, the spherical head 201 of the tail part of the bone screw 200 enters the spherical cavity 32 through the entrance, and the lower part of the extrusion cavity 13 is formed with a tapered surface, so that when pressure is applied to the main body part of the cladding member 30 to move the cladding member 30 downward, the tapered surface of the extrusion cavity 13 applies pressure to all the elastic arms 31 to make the elastic arms 31 clamp the spherical head 201, thereby increasing the damping of the angle adjustment of the bone screw 200 and completely locking the bone screw 200.

[0048] As shown in Figure 2 and Figure 3As shown, an inner thread is formed on the upper cavity wall of the cylindrical cavity 11 of the first holding member 10, and an outer thread is formed on the outer peripheral surface of the main gland 41. Thus, the main gland 41 can be screwed into the upper portion of the cylindrical cavity 11 from the top of the first holding member 10. A driven operation groove 411 for a force applying tool to screw the main gland 41 is formed in the middle region of the upper portion of the main gland 41. The force applying tool screws the main gland 41 by acting on the driven operation groove 411.

[0049] As Figure 2 and Figure 3As shown, a force transmission member 50 is arranged between the axial section between the main gland 41 and the main body of the covering member 30, which is used to transmit the force applied by the main gland 41 to the covering member 30 to move the covering member 30 downwardly, thereby increasing the damping of the bone pin 200 and locking the bone pin 200. Specifically, the force transmission member 50 includes a base 51 for being combined with the main body of the covering member 30 and a driven arm 52 extending axially upwardly from the base 51 to the bottom of the main gland 41, the driven arm 52 includes two, two opposite gaps 54 are defined between the two driven arms 52, the gaps 54 are opposite to the main accommodating groove 12, so that the rod-shaped member 300 can pass through the force transmission member 50 to avoid interference with the movement of the force transmission member 50, the width of the gap 54 should be greater than the diameter of the rod-shaped member 300, for example, the width of the gap 54 is equal to or greater than the width of the main accommodating groove 12 to avoid the gap 54 affecting the pivoting or movement of the rod-shaped member 300 in the coronal plane and the transverse plane. The two driven arms 52 pass through the annular gap between the second retaining member 20 and the cylindrical cavity 11, so that the axial movement of the driven arm 52 will not be interfered by the penetrated member, and by reasonably configuring the annular gap, the driven arm 52 will not interfere with the second retaining member 20 when the first retaining member 10 moves relative to the second retaining member 20. When the main gland 41 is screwed downwardly, the main gland 41 drives the driven arm 52 to move downwardly so that the base 51 presses the covering member 30 to move downwardly to increase the damping of the bone pin 200 and lock the damping. Preferably, a positioning groove 14 is formed on the cavity wall of the cylindrical cavity 11, and a positioning protrusion 53 is arranged on the outer surface of the driven arm 52, when the second retaining member 20 is mounted into the cylindrical cavity 11 from the top of the first retaining member 10, the positioning protrusion 53 on the driven arm 52 slides into the positioning groove 14, so that the rotation of the force transmission member 50 relative to the first retaining member 10 is limited, thereby limiting the rotation of the first retaining member 10 relative to the bone pin 200 in the locked state of the bone pin 200. An operation hole 55 is arranged on all components between the spherical cavity 32 of the covering member 30 and the top of the first retaining member 10, which can enable the force applying tool to reach the spherical head 201 of the bone pin 200 from the top of the first retaining member 10, so that before the rod-shaped member 300 is combined, the force applying tool acts on the driven operation groove 202 of the spherical head 201 of the bone pin 200 through the operation hole 55 for screwing the bone pin 200.

[0050] As Figure 2 and Figure 3As shown, the bottom of the driven operating slot 411 of the main gland 41 is provided with a threaded hole 412 which penetrates the bottom of the main gland 41, the first auxiliary gland 42 is screwed into the threaded hole 412, the upper portion of the first auxiliary gland 42 is provided with a driven operating slot 421 for a force applying tool to screw the first auxiliary gland 42, by screwing down the first auxiliary gland 42 to press the lower portion of the first auxiliary gland 42 against the second auxiliary gland 43 to make the second holding member 20 drive the rod-shaped member 300 to abut against the V-shaped groove bottom 121 of the main accommodating groove 12, thereby fixing the rod-shaped member 300 with the first holding member 10. Since the bone nail 200 can be completely locked by screwing the main gland 41, and the rod-shaped member 300 is fixed with the first holding member 10 by screwing the first auxiliary gland 42, so that the rod-shaped member 300 can rigidly support the corresponding vertebrae through the coupler 100 provided by the present application, and the rod-shaped member 300 is released by screwing the first auxiliary gland 42 in the opposite direction, thereby allowing the coupler 100 to move relative to the rod-shaped member 300, thereby allowing the vertebrae to move relative to the rod-shaped member 300, and further allowing the vertebrae to have a certain degree of movement, and since the width of the main accommodating groove 12 is greater than the width of the rod-shaped member 300, thereby allowing the vertebrae to move in any plane including the sagittal plane, coronal plane, and transverse plane. Preferably, the force applying tool is configured to have an outer sleeve and an inner sleeve for acting on the driven operating slot 411 of the main gland 41 and the driven operating slot 421 of the first auxiliary gland 42 respectively, the outer sleeve and the inner sleeve are independently driven from each other, thereby screwing the main gland 41 and the first auxiliary gland 42 from the top of the coupler 100.

[0051] As Figure 6 and Figure 7 and in combination with Figure 3As shown, the key of the present application is to provide an elastic component 60 with a structure and deformation features different from the elastic component formed by two symmetrically arranged elastic bending plates, specifically, the elastic component 60 includes an inner cylinder segment 67, an outer cylinder segment 68 and a bending segment 64 integrally connected between the outer cylinder segment 68 and the inner cylinder segment 67 in the outer shape structure, the inner cylinder segment 67, the outer cylinder segment 68 and the bending segment 64 of the elastic component 60 are formed by radially inwardly reverse bending of the wall (referred to as elastic wall 63) made of elastic material (at this time, the part formed after the inwardly reverse bending is the inner cylinder segment 67) or radially outwardly reverse bending of the wall (at this time, the part formed after the outwardly reverse bending is the outer cylinder segment 68), the end of the inner cylinder segment 67 and the end of the outer cylinder segment 68 are both upward, the end of the inner cylinder segment 67 is referred to as a first joint end 61, and the end of the outer cylinder segment 68 is referred to as a second joint end 62. Preferably, the middle and lower part of the inner cylinder segment 67, the middle and lower part of the outer cylinder segment 68 and the bending segment 64 are formed into elastic deformation segments 66 by reducing the thickness, and a plurality of slits 65 are arranged in the circumferential direction on the area where the elastic deformation segments 66 are located. Preferably, the first joint end 61 is higher than the second joint end 62.

[0052] The elastic component 60 with the above structure features has the following deformation features: 1. When the pressure is applied to the first joint end 61 while the second joint end 62 is fixed, the first joint end 61 moves downward, which is equivalent to that the elastic component 60 is elastically compressed, however, the internal stress features of the elastic component 60 during the elastic compression deformation are different from those of the elastic component formed by the elastic bending plates, during the compression of the elastic component 60 formed by the elastic bending plates, the internal stress is always mainly concentrated in the area where the inner convex part of the elastic bending plate is located, while in the compression process of the elastic component 60 of the present application, the bending segment 64 at the bottom is changed and is not responsible for the elastic wall 63 of the fixed (inherent) segment, specifically, as the elastic component 60 is compressed, the elastic wall 63 which has not been bent before the inner cylinder segment 67 starts to bend with the compression degree, thus, different compression degrees are responsible for the bending of the elastic wall 63 of different segments, so that the internal stress caused by the bending does not occur in the fixed segment during the compression, similarly, when the pulling force is applied to the first joint end 61, which is equivalent to that the elastic component 60 is elastically stretched, different stretching degrees are responsible for the bending of the elastic wall 63 of different segments, thus, the internal stress caused by the bending does not only occur in the fixed segment during the stretching. Thus, the elastic component 60 provided by the present application can delay the elastic deformation failure of the elastic component 60 because the stress caused by the deformation does not concentrate and always occurs in a certain fixed segment, so that the internal stress is dispersed by the elastic wall 63 of the longer segment.

[0053] 2、In the case of the second joint end 62 being fixed, the inner cylinder segment 67 can swing in any direction in a way that provides elastic damping, and can automatically elastically reset, and, when swinging, the internal stress can also be dispersed to some extent by the elastic wall 63, thereby delaying the elastic deformation failure of the elastic component 60.

[0054] 3、By reducing the thickness of the middle and lower part of the inner cylinder segment 67, the middle and lower part of the outer cylinder segment 68, and the curved segment 64, so that the elastic deformation only occurs in the reduced thickness segment, thereby facilitating the pre-limitation of the deformation segment of the elastic component 60 in the design stage.

[0055] 4、By opening a plurality of circumferentially arranged slits 65 in the area where the elastic deformation segment 66 is located, thereby allowing the inner cylinder segment 67 to elastically twist and automatically reset in the case of the second joint end 62 being fixed.

[0056] Based on the above, the elastic component 60 not only allows the first joint end 61 to elastically stretch, elastically swing in any direction, and elastically twist, and, when elastically stretching and elastically swinging, the internal stress is not concentrated in a smaller area, and has the ability to disperse internal stress.

[0057] As shown in Figure 4 and Figure 5 and in combination with Figure 3 , the elastic component 60 is installed below the second retaining component 20, and the first joint end 61 is fixedly connected to the second retaining component 20, and the second joint end 62 is fixedly connected to the force transmission component 50. Specifically, a cylindrical joint part is machined on the bottom of the second retaining component 20, the first joint end 61 is sleeved on the cylindrical joint part, and the first joint end 61 is fixedly connected to the bottom of the second retaining component 20 by a plurality of screws that are circumferentially arranged and radially penetrate the cylinder wall of the first joint end 61 and are screwed into the cylindrical joint part; a circumferentially extending embedding groove 511 is opened on the inner side wall of the lower part of each driven arm 52, the embedding groove 511 penetrates to the aperture 54, a stepped surface 512 is formed above the embedding groove 511, two flange plates 621 are configured on the second joint end 62, when installing the elastic component 60, first align the flange plates 621 with the aperture 54, so that the flange plates 621 can be moved from the top of the aperture 54 to the position where the flange plates 621 are flush with the embedding groove 511 at the bottom of the aperture 54, then rotate the elastic component 60 so that the flange plates 621 slide into the embedding groove 511 from one side of the embedding groove 511, then screw a plurality of fasteners arranged circumferentially from the stepped surface 512 and make the screws penetrate the flange plates 621 to fix the flange plates 621, thereby fixing the second joint end 62 to the force transmission component 50.

[0058] The advantages of the application of the coupler 100 provided with the above-mentioned structure of the elastic component 60 to the spinal column stabilizing device will be described below.

[0059] In terms of rigid support to the problem vertebra: the adapter 100 can be used to provide rigid support to the problem vertebra, specifically, the adapter 100 can be arranged on the section of the rod-shaped component 300 corresponding to the problem vertebra, by screwing down the first sub-gland 42 to press against the second holding component 20, the first adapter end 61 of the elastic component 60 is in compliance with the second holding component 20, the elastic component 60 is elastically compressed, the rod-shaped component 300 is pressed against the V-shaped groove bottom 121 of the two main accommodating grooves 12 as the second holding component 20 is pressed down, the rod-shaped component 300 is fixed with the first holding component 10, thereby limiting the activity of the first holding component 10 (i.e. the adapter 100) relative to the rod-shaped component 300, and further limiting the activity of the problem vertebra relative to the rod-shaped component 300, thereby achieving rigid support of the rod-shaped component 300 to the problem vertebra.

[0060] In terms of dynamic support to the normal vertebra 400 adjacent to the terminal problem vertebra: the adapter 100 is particularly suitable for providing dynamic support to the normal vertebra 400 adjacent to the terminal problem vertebra, specifically, the adapter 100 is arranged on the terminal section of the rod-shaped component 300 corresponding to the normal vertebra 400, at this time, by screwing up the first sub-gland 42 to release the pressure on the second holding component 20, the elastic component 60 is switched from the elastic compression state to the elastic reset state due to the release of pressure, the second holding component 20 is lifted to drive the rod-shaped component 300 away from the groove bottom of the main accommodating groove 12, and the first sub-gland 42 still has a certain distance from the second holding component 20 after the second holding component 20 is lifted, since the width of the main accommodating groove 12 is greater than the width of the rod-shaped component 300, and the rod-shaped component 300 is away from the groove bottom of the main accommodating groove 12 and the first sub-gland 42, therefore, the first holding component 10 is in a movable connection with the rod-shaped component 300, thereby allowing the first holding component 10 to move relative to the rod-shaped component 300, in this way, the rod-shaped component 300 provides dynamic support to the vertebra through the elastic component 60, thereby allowing the vertebra to move under the elastic damping provided by the elastic component 60.

[0061] It should be noted that in the present application, the so-called dynamic support does not mean that the movement of the vertebra is not inhibited at all, but means that the movement of the vertebra is allowed under the elastic damping provided by the elastic component 60, therefore, the movement of the vertebra is inhibited by the elastic damping, which is beneficial to avoid that the lost movement of the problem vertebra is mainly compensated by the adjacent normal vertebra 400, thereby protecting the adjacent vertebra.

[0062] In the dynamic support aspect, the second holding component 20 is restricted from moving due to being fixed with the rod-like component 300, thus the vertebrae is allowed to move with the first holding component 10, based on the elastic deformation characteristics of the elastic component 60 provided by the present application, the coupler 100 provided by the present application allows the first holding component 10 to move axially under elastic damping and automatically elastically reset, and allows the first holding component 10 to swing radially and twist under elastic damping and automatically reset due to the provision of the elastic component 60 described above. As shown in Figure 8 the first holding component 10 is allowed to move axially and swing in any direction in the plane perpendicular to the axial direction of the first holding component 10 under elastic damping, thus allowing the vertebrae to pitch in the sagittal plane (since the spinal column stabilizing device is located in the sagittal plane and on the posterior side of the vertebrae, the first holding component 10 needs a certain amount of axial movement to accommodate the pitch of the vertebrae); the first holding component 10 is allowed to swing in any direction in the plane perpendicular to the axial direction of the first holding component 10 under elastic damping, thus allowing the vertebrae to twist in the transverse plane; the first holding component 10 is allowed to twist in the plane perpendicular to the axial direction of the first holding component 10 under elastic damping, thus allowing the vertebrae to swing in the coronal plane.

[0063] In some preferred structures, the first sub-gland 42 is provided with support columns 422 arranged circumferentially and capable of elastically extending and elastically retracting from the bottom of the first sub-gland 42, when the first sub-gland 42 is screwed downward to abut against the second sub-gland 43 which abuts against the top of the second holding component 20, the support columns 422 retract into the first sub-gland 42, and when the first sub-gland 42 is screwed upward to release the second holding component 20, the support columns 422 extend from the bottom of the first sub-gland 42 to abut against the second sub-gland 43, so that the second holding component 20 is kept a certain distance from the first sub-gland 42, thus facilitating the prevention of interference between the rod-like component 300 and the first sub-gland 42 when the first holding component 10 moves relative to the rod-like component 300 by providing a pre-tightening pressure to the second holding component 20. Furthermore, although exemplary embodiments have been described herein, the scope of the application includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of

[0064] The above description is intended to be illustrative, and not restrictive. For example, the above-described examples (or one or more aspects thereof) can be used in combination with each other. Other embodiments can be used, which will be apparent to those of ordinary skill in the art upon reviewing the above description. Additionally, the various features described above can be grouped together or divided into separate features for simplicity. This should not be interpreted as requiring that the claimed subject matter must comprise the particular grouped features. Rather, the subject matter described herein is intended to encompass all possible combinations of the features described or illustrated herein. The scope of the present application should be determined by reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The claims, as set forth below, are intended to be illustrative, and not restrictive, of the claimed subject matter.

[0065] The above embodiments are only exemplary embodiments of the present application, not intended to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be considered to fall within the protection scope of the present application.

Claims

1. A rod-end pedicle screw connector, characterized in that, The application relates to a retaining device for a pedicle screw, comprising: a first retaining component having a cylindrical cavity and a main accommodating groove for accommodating a rod-shaped component and having a width greater than the diameter of the rod-shaped component, and a pressing cavity below the cylindrical cavity; a second retaining component arranged in the cylindrical cavity and fixed with the rod-shaped component; a main pressure cover screwed with the upper cavity wall of the cylindrical cavity; a first auxiliary pressure cover for pressing the second retaining component; a covering component arranged in the pressing cavity and defining a spherical cavity for covering the ball head of the pedicle screw, the pressing cavity forcing the spherical cavity to clamp the ball head by pressing the covering component; wherein: a force transmission component is arranged between the covering component and the main pressure cover, and the force transmission component is used for transmitting the pressure applied by the main pressure cover to the covering component; an elastic component is arranged in the cylindrical cavity, and the elastic component is arranged to have a first joint end and a second joint end in the axial direction, and by elastic deformation, the first joint end is allowed to approach or move away from each other and to swing in any direction relative to the second joint end; the first joint end is fixedly connected to the second retaining component, and the second joint end is fixedly connected to the first retaining component or the force transmission component.

2. The rod tip pedicle screw coupler of claim 1, wherein, The elastic component comprises an outer cylinder segment and an inner cylinder segment formed by reversely bending the elastic wall radially outward or radially inward and integrally connected at the bottom by a bending segment, the upper end of the inner cylinder segment is the first joint end, and the upper end of the outer cylinder segment is the second joint end.

3. The rod tip pedicle screw coupler of claim 2, wherein, The middle and lower parts of the inner cylinder segment, the middle and lower parts of the outer cylinder segment and the bending segment form elastic deformation segments by reducing the thickness.

4. The rod tip pedicle screw coupler as recited in claim 3, wherein, Slits are arranged in the region of the elastic deformation segments.

5. The rod tip pedicle screw coupler as claimed in claim 2, 3, or 4, wherein, The force transmission component comprises a base and two opposite driven arms formed on the base, and the rod-shaped component passes through the gap between the two driven arms; the driven arms extend axially upward in the cylindrical cavity, extend to the bottom of the main pressure cover through the annular gap between the outer peripheral surface of the first retaining component and the cavity wall of the cylindrical cavity.

6. The rod tip pedicle screw coupler of any one of Claims 1-4, wherein, A through threaded hole is arranged in the middle region of the main pressure cover, the first auxiliary pressure cover is screwed in the threaded hole, and the first auxiliary pressure cover is pressed against the second retaining component by screwing.

7. The rod tip pedicle screw coupler as recited in claim 5, wherein, The first joint end of the elastic component is fixedly connected to the bottom of the second retaining component, and the second joint end of the elastic component is connected to the force transmission component.

8. The rod tip pedicle screw coupler as recited in claim 7, wherein, The bottom of the second retaining component is arranged as a cylindrical joint part, the first joint end is sleeved on the cylindrical joint part, a circumferentially extending positioning groove is arranged on the sidewall of the lower part of the driven arm, a stepped surface is formed above the positioning groove, a flange plate is formed on the second joint end, the flange plate slides into the positioning groove from one side of the gap, a fastener is screwed into the stepped surface and penetrates the flange plate to fix the flange plate.

9. The rod tip pedicle screw coupler as recited in claim 1, wherein, A sub-receiving groove is formed in the top of the second holding component, the sub-receiving groove is opposite to the circumferential position of the main receiving groove, the sub-receiving groove has a cylindrical groove bottom matched with the outer circumferential surface of the rod-shaped component, the sub-receiving groove is used for receiving the rod-shaped component, the top of the second holding component is screwed with a second sub-gland used for pressing against the rod-shaped component, and the first sub-gland is used for pressing against the second sub-gland.

10. The rod tip pedicle screw coupler as recited in claim 1, wherein, The first sub-gland is installed with support columns arranged in a circle and capable of elastically extending and elastically retracting at the bottom of the first sub-gland.

11. A spinal column stabilization system comprising: Rod-shaped component, pedicle screw, characterized in that the spinal column stabilization system further comprises a rod-end pedicle screw connector according to any one of claims 1 to 10, the rod-end pedicle screw connector is combined to the rod-shaped component, and the pedicle screw is combined to the bottom of the rod-end pedicle screw connector.

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