Bone peg coupling member and spinal dynamic correction system

Abstract

Disclosed are a bone screw coupling component and a spinal dynamic correction system. The bone screw coupling component includes a rod coupling assembly having a receiving slot configured to receive a support rod, and a screw coupling assembly having a covering cavity configured to receive and clamp a spherical screw cap of a bone screw. The rod coupling assembly is configured to have a release state allowing the support rod to pivot within a first plane defined by the receiving slot, and a locking state fixing the support rod in the receiving slot, and the rod coupling assembly is switchable between the release state and the locking state. The rod coupling assembly and the screw coupling assembly are configured to have a release state allowing the two to pivot relative to each other within a second plane perpendicular to the first plane, and a locking state limiting the two from pivoting relative to each other, and the two are switchable between the release state and the locking state.

Description

Technical Field

[0001] This invention relates to a device for stabilizing and correcting the spine, and more particularly to a bone screw combination component and a spinal correction system. Background Technology

[0002] A typical spinal correction (stabilization) system used to correct (stabilize) the spine in order to restore its normal physiological curve usually consists of a support rod, bone screws, and connecting components (or connectors). The support rod is arranged along the extension of the spine, that is, along the arrangement of the vertebrae. The bone screws are used to screw into each vertebra. The connecting components are used to connect the bone screws to the support rod. Typically, along the length of the support rod, there are multiple bone screws arranged at intervals through corresponding connecting components, each for screwing into different segments of the vertebrae. Thus, the support rod, with the help of the connecting components and bone screws, supports the vertebrae of the spine and thereby stabilizes or corrects the spine.

[0003] In existing technologies, each bone screw is typically fixedly connected to a support rod via its corresponding connecting component. Therefore, the support rod provides rigid support to the vertebral segments anchored by the bone screws. The significant advantage of rigid support is that it can correct and stabilize the problematic vertebrae to a normal posture by completely restricting their mobility. However, rigid support also has the following drawbacks: 1. Applying rigid support to normal vertebrae (to maintain the continuity of spinal correction, normal vertebrae located between the problematic vertebrae also need to be screwed into bone screws and supported by the support rod) causes the normal vertebrae to lose mobility during corrective treatment. This makes it difficult for the normal vertebrae to immediately regain mobility after the correction system is removed, and may even eventually result in the loss of some mobility; 2. The intervertebral discs corresponding to the vertebrae adjacent to the terminal vertebrae are forced to compensate for the lost mobility due to the rigid support, which can easily lead to disc damage or failure.

[0004] Existing technologies include dynamic spinal correction systems that provide dynamic support for certain vertebral segments. Dynamic support refers to allowing a certain degree of mobility in the supported vertebrae, thus preventing the inhibition of mobility in all vertebrae. Existing technologies typically achieve dynamic support for the corresponding vertebra by creating a movable connection (often a pivotal connection) between the connecting component and the support rod. That is, by allowing the connecting component to move relative to the support rod within a certain spatial or angular range, the corresponding vertebra is allowed a certain degree of mobility. Two methods of movable connection between the connecting component and the support rod have emerged in existing technologies. The first method involves a movable connection between the connecting component and the support component in a manner that does not produce a tendency to return to its original position after relative movement (e.g., relative pivoting). For example, the connecting component and the support rod are movablely connected only by a cylindrical or spherical mating mechanism. This type of movable connection makes it difficult for the vertebrae to automatically return to their original position after movement, leading to difficulty in repositioning the patient's spine after movement and muscle involvement in the affected area. The second type of movable connection involves the connecting component and the supporting component being connected in a way that creates a repositioning tendency after relative movement. For example, the connecting component and the supporting rod are connected by an elastic component. Thus, after the connecting component moves relative to the supporting rod, the elastic force generated by the elastic component provides a repositioning tendency for the vertebrae corresponding to the connecting component, thereby facilitating spinal repositioning after movement and reducing muscle strain. Existing technologies also configure the connection between the connecting component and the supporting rod to be switchable between movable and fixed connections, allowing for targeted switching between rigid and dynamic support for certain vertebrae.

[0005] However, the existing technology's movable connection method between the connecting component and the support rod still has the following significant limitations for certain specific treatment requirements:

[0006] Once the connecting component and support rod are switched to the movable connection state, the connecting component can move freely in multiple planes without restriction. That is, the connecting component has a degree of mobility in multiple planes, and the mobility lacks directional selectivity. This means that the mobility of the connecting component in the coronal and sagittal planes cannot be controlled separately. This characteristic of the movable connection method cannot meet the following treatment requirements: For example, when correcting the curvature of the spine that mainly occurs in the coronal plane, that is, when correcting scoliosis, it is usually required to completely suppress the mobility of the vertebrae in the coronal plane while requiring the vertebrae to have a certain degree of mobility in the sagittal plane. As another example, when correcting the curvature of the spine that mainly occurs in the sagittal plane, it is usually required to completely suppress the mobility of the vertebrae in the sagittal plane while requiring the vertebrae to have a certain degree of mobility in the coronal plane. Summary of the Invention

[0007] To address the aforementioned technical problems in the prior art, the present invention provides a bone nail combination component and a dynamic spinal correction system.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] A bone screw connection component, comprising:

[0010] The rod assembly is provided with a receiving groove for receiving the support rod;

[0011] A nail-jointing assembly having a covered cavity for receiving and clamping a spherical nail head of a bone nail; wherein:

[0012] The rod coupling assembly is configured to have a released state that allows the support rod to pivot within a first plane defined by the receiving groove and a locked state that secures the support rod in the receiving groove, and the rod coupling assembly is capable of switching between the released state and the locked state.

[0013] The relationship between the rod-connecting assembly and the nail-connecting assembly is configured to have a released state that allows both to pivot relative to each other in a second plane perpendicular to the first plane and a locked state that restricts their relative pivoting, and both can switch between the released state and the locked state.

[0014] Preferably,

[0015] A first elastic member is provided in the rod connection assembly, the first elastic member being used to provide a restoring force after the rod connection assembly and the support rod have pivoted relative to each other.

[0016] A second elastic member is disposed between the rod-connecting assembly and the nail-connecting assembly, the second elastic member being used to provide a restoring force after the rod-connecting assembly and the nail-connecting assembly have pivoted relative to each other.

[0017] Preferably,

[0018] The rod-connecting assembly includes at least a rod-connecting main body component, and the receiving groove includes a first receiving groove disposed on the rod-connecting main body component; the nail-connecting assembly includes at least a nail-connecting main body component, and the covering cavity is disposed in the nail-connecting main body component and extends through its bottom to form an entrance to the covering cavity for the nail head of the bone nail to enter; wherein:

[0019] An end shaft is provided on the bottom end face of the rod-connecting main body component, and a groove is provided on the top end face of the nail-connecting main body component. A positioning hole is provided at the bottom of the groove, and the end shaft is inserted into the positioning hole; the second elastic component is a coil spring, which is disposed in the groove and its two ends are respectively connected to the end shaft and the groove wall of the groove.

[0020] The outer edge of the top of the nail-connected main body component is provided with an outer step. A connecting sleeve is provided between the nail-connected main body component and the rod-connected main body component. The connecting sleeve is screwed into the rod-connected main body component. The connecting sleeve is provided with an inner step. The inner step cooperates with the outer step so that the top end face and the bottom end face can be tightly contacted or separated by twisting the connecting sleeve in both directions.

[0021] Preferably,

[0022] The bottom end face of the rod-joining main component and the top end face of the nail-joining main component are configured as rough surfaces to increase the friction when they come into contact.

[0023] Provides an elastic force between the rod-connecting main body component and the rod-connecting main body component, causing the two to tend to move away from each other.

[0024] Preferably, the screw-connecting assembly further includes: a push sleeve and a push nut; the covering cavity is formed by a plurality of circumferentially arranged covering flaps; the push sleeve and the push nut are coaxially sleeved outside the screw-connecting main body component and the push nut is screwed into the screw-connecting main body component, and the screw cap of the bone screw is fixed in the covering cavity by the push nut pushing against the push sleeve; wherein:

[0025] The push nut and the connecting sleeve are coaxial and spaced apart. The outer edges of the push nut and the connecting sleeve are both provided with operating parts for engaging with a screwing tool. The outer edges of the push nut and the connecting sleeve both protrude radially beyond the outer edge of the rod-connecting main body component. The outer edge of the push nut also protrudes radially beyond the outer edge of the connecting sleeve, so as to allow the screwing tool to pass through the rod-connecting main body component to reach the connecting sleeve and the push nut and engage with their operating parts.

[0026] Preferably, the rod connection assembly further includes: an inner attachment component, an outer pressure nut, and an inner pressure nut;

[0027] The inner attachment component is disposed in the cylindrical cavity of the rod-connecting main component, and its cavity wall has a gap. The receiving groove includes a second receiving groove disposed on the inner attachment component and opposite to the first receiving groove, the second receiving groove being used to receive the support rod; wherein:

[0028] The inner pressure nut is screwed onto the top of the inner attachment component to fix the inner attachment component to the support rod;

[0029] The external pressure nut is screwed onto the top of the rod-connecting main body component to restrict or allow the support rod to pivot by directly or indirectly pressing against or releasing the pressure on the support rod.

[0030] The first elastic component is disposed between the inner attachment component and the rod-connecting main body component.

[0031] Preferably, the first elastic member is disposed between the bottom of the inner attachment member and the bottom of the column cavity of the rod-connecting main body member; the first elastic member has two radially inwardly bent elastic plates arranged symmetrically and two connecting portions for attaching to the bottom of the inner attachment member and the bottom of the column cavity, respectively.

[0032] Preferably, a pressure-applying component is attached to the bottom of the external pressure nut, and the external pressure nut is rotatable relative to the pressure-applying component; wherein:

[0033] The pressure-applying component has a pressure strip located in the first receiving groove and slidable thereal. The pressure strip is driven by an external pressure nut and presses against the support rod. The side of the pressure strip fits into the groove wall of the first receiving groove to limit the two groove walls of the first receiving groove from moving away from each other.

[0034] Preferably, the bottom of the pressure strip and the bottom of the first receiving groove are both configured in a V-shape.

[0035] This invention also discloses a dynamic spinal correction system, comprising: a support rod, multiple bone screws, and the aforementioned bone screw connecting component, wherein:

[0036] Each bone screw is connected to the support rod via the bone screw connection component.

[0037] Compared with the prior art, the beneficial effects of the bone nail combination component and the dynamic spinal correction system disclosed in this invention are:

[0038] 1. The range of motion of the vertebrae supported by the support rod in the coronal plane and in the sagittal plane can be independently released and inhibited by the connecting components provided by the present invention, thereby enabling the correction system to be applied to correct and stabilize more types of spinal deformities and expanding its scope of application.

[0039] 2. The combined components enable the correction system to provide not only rigid support but also dynamic support to the vertebrae of the spine. Furthermore, the combined components enable the system to provide not only full dynamic support by simultaneously releasing the vertebrae's range of motion in the sagittal and coronal planes, but also directional dynamic support by releasing the vertebrae's range of motion only in the sagittal or coronal planes.

[0040] 3. The present invention configures the part of the connecting component for connecting with the support rod and the part for connecting with the bone nail as two separate components that can pivot relative to each other in the coronal plane and can be fixed to each other, thereby enabling control over the release and inhibition of the vertebral mobility in the coronal plane.

[0041] 4. The outer edges of the connecting sleeve and the push nut are configured to be larger than the outer edges of the rod-connecting main body component, thereby facilitating the use of sleeve-type screwing tools to screw the connecting sleeve and the push nut through the rod-connecting main body component.

[0042] 5. The outer pressure nut and connecting sleeve are arranged coaxially with the inner pressure nut and push sleeve, and are all arranged along the axis of the main component of the rod connection. This allows the switching of the support state of the vertebra (switching between rigid support and dynamic support) to be achieved simply by using a screwing tool to axially align the outer pressure nut and connecting sleeve and then screwing them. There is no need to screw the outer pressure nut and connecting sleeve from the side, thus avoiding restricted screwing operation and interference with other areas of the vertebra.

[0043] 6. Other advantages of the present invention are described directly or implicitly in the specific embodiments described in the specification.

[0044] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0045] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0046] Figure 1 This is an exploded view of the bone nail assembly provided by the present invention.

[0047] Figure 2 This is a three-dimensional structural diagram of the bone screw connection component provided by the present invention, showing the state of releasing the movement of the support rod in the sagittal plane and inhibiting the movement of the support rod in the coronal plane.

[0048] Figure 3 This is a top view of the bone nail assembly provided by the present invention.

[0049] Figure 4 The bone screw connection component provided by the present invention is shown in a cross-sectional view with the sagittal plane as the cross-section (the bone screw connection component is in a state of releasing the movement of the support rod in the sagittal plane and inhibiting the movement of the support rod in the coronal plane).

[0050] Figure 5 The cross-sectional view of the bone screw connection component provided by the present invention (the bone screw connection component is in a state of releasing the movement of the support rod in the sagittal plane and inhibiting the movement of the support rod in the coronal plane).

[0051] Figure 6This is a three-dimensional structural diagram of the bone screw connection component provided by the present invention, showing a state in which the movement of the support rod in the sagittal plane is suppressed and the movement of the support rod in the coronal plane is released.

[0052] Figure 7 The bone screw connection component provided by the present invention is shown in a cross-sectional view with the sagittal plane as the cross-section (the bone screw connection component is in a state of inhibiting the movement of the support rod in the sagittal plane and releasing the movement of the support rod in the coronal plane).

[0053] Figure 8 This is a side view of the correction system provided by the present invention in a correction state.

[0054] Figure 9 This is a rear view of the correction system provided by the present invention in the correction state.

[0055] Figure label:

[0056] 100-Rod connection assembly; 10-Rod connection main body component; 11-First receiving groove; 111-Matching strip; 112-Matching groove; 12-Cylinder cavity; 13-Bottom end face; 14-End shaft; 20-Inner attachment component; 21-Second receiving groove; 30-First elastic component; 31-Elastic sheet; 32-Upper connecting plate; 33-Lower connecting plate; 41-Outer pressure nut; 411-Pressure application component; 412-Pressure application strip; 413-Attachment ring; 42-Inner pressure nut; 50-Nail connection main body component Components; 51-Covering cavity; 52-Covering flap; 53-Outer step; 54-Sink; 55-Positioning hole; 56-Top end face; 60-Push sleeve; 70-Push nut; 71-Notch; 80-Connecting sleeve; 81-Notch; 82-Inner step; 90-Coil spring; 200-Nail-connecting assembly; 300-Bone nail; 301-Nail head; 400-Support rod; 500-Connecting component; 1001-Vertebral bone; 1002-Intervertebral disc; 2000-Tightening tool; 2001-Force arm. Detailed Implementation

[0057] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0058] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0059] like Figure 8 and Figure 9 As shown, the present invention discloses a connecting component 500 and a dynamic spinal correction system. In addition to the connecting component 500, the system also includes a support rod 400 and bone screws 300. The bone screws 300 are used to be screwed into the posterior side of the vertebrae 1001 of each segment of the spine. The bone screws 300 are connected to the support rod 400 by means of the connecting component 500 as a connecting medium. Thus, the bone screws 300 screwed into the vertebrae 1001 of each segment are connected in series on the support rod 400 by means of the corresponding connecting component 500 along the arrangement direction of the vertebrae 1001. Thus, the support rod 400 supports the vertebrae 1001 into which each bone screw 300 is screwed, correcting and stabilizing them to a reasonable posture. The connecting component 500 provided by the present invention has the ability to rigidly support the vertebra 1001 by completely restricting its range of motion. Furthermore, it also has the ability to dynamically support the vertebra 1001 by releasing its range of motion. Furthermore, it also has the ability to assist the vertebra 1001 in repositioning after movement. Moreover, the connecting component 500 provided by the present invention has the ability to selectively allow the vertebra 1001 to have a range of motion only in a certain plane (or direction).

[0060] The system provided by this invention is particularly suitable for correcting the following types of spinal deformities:

[0061] An abnormal curvature occurs in the entire spine or a considerable length of the spine, primarily in the coronal plane, i.e., scoliosis; an abnormal curvature occurs in the entire spine or a considerable length of the spine, primarily in the sagittal plane; or an abnormal curvature occurs in the entire spine or a considerable length of the spine, with curvature present in both the coronal and sagittal planes.

[0062] like Figures 1 to 7 As shown, the connecting component 500 provided by the present invention includes: a rod connecting assembly 100 and a nail connecting assembly 200. The rod connecting assembly 100 and the nail connecting assembly 200 are separate structures that are assembled together. The rod connecting assembly 100 is used to receive the support rod 400, and the nail connecting assembly 200 is used to receive the spherical nail head 301 of the bone nail 300 that has been screwed into the vertebra 1001.

[0063] like Figure 1 , Figure 2 , Figure 4 As shown, the nail-connecting assembly 200 includes a nail-connecting main body component 50, a push sleeve 60, and a push nut 70. The nail-connecting main body component 50 has a top facing the rod-connecting assembly 100 and a bottom facing the bone nail 300 and the vertebra 1001. A spherical covering cavity 51 is formed in the nail-connecting main body component 50, which extends to the bottom of the nail-connecting main body component 50 to form an entrance. The spherical nail head 301 of the bone nail 300 enters the covering cavity 51 from the entrance at the bottom of the nail-connecting main body component. The covering cavity 51 is formed by multiple covering petals 52 separated by multiple circumferentially arranged notches. By radially deforming the numerous covering petals 52, the covering cavity 51 clamps the nail head 301 of the bone nail 300, thereby fixing the bone nail 300 to the nail-connecting main body component 50. A push sleeve 60 is fitted outside the nail-connecting main body component 50 at the location of the covering flap 52. The push sleeve 60 engages with the inclined surface of the outer wall formed by the covering flap 52. A push nut 70 is fitted outside the nail-connecting main body component 50 and screwed into it. By screwing the push nut 70, the push sleeve 60 is pushed against the push sleeve 60, causing the push sleeve 60 to move axially toward the bone nail 300. This, through the inclined surface engagement, forces the covering flap 52 to deform radially and clamp the nail head 301 of the bone nail 300. During spinal correction, the bone nail 300 and the nail-connecting main body component 50 must remain in a fixed connection state.

[0064] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, the rod connection assembly 100 includes: a rod connection main body component 10, an inner attachment component 20, a first elastic component 30, an outer pressure nut 41, and an inner pressure nut 42.

[0065] The rod-connecting main body component 10 is generally cylindrical in shape. The rod-connecting main body component 10 has a bottom facing the nail-connecting assembly 200 and a top facing the operating side opposite to the bottom. A cylindrical cavity 12 extending towards the bottom is formed from the top of the rod-connecting main body component 10. The cylindrical cavity 12 makes the rod-connecting main body component 10 form a cylindrical side wall. A first receiving groove 11 extending towards the bottom is formed from the top of the rod-connecting main body component 10. Two radially opposite first receiving grooves 11 are formed on the side wall of the rod-connecting main body component 10. The support rod 400 enters the first receiving groove 11 through the groove at the top of the rod-connecting main body component 10.

[0066] The inner attachment component 20 is generally cylindrical in shape. The radial dimension of the inner attachment component 20 is smaller than the radial dimension of the cylindrical cavity 12 of the rod connecting main component 10. The inner attachment component 20 is arranged in the cylindrical cavity 12 of the rod connecting main component 10 in a manner consistent with the axial direction of the rod connecting main component 10. Because the radial dimension of the inner attachment component 20 is smaller than the radial dimension of the cylindrical cavity 12 of the rod connecting main component 10, the inner attachment component 20 has a certain amount of mobility. A second receiving groove 21 extending from the top of the inner attachment component 20 towards the bottom is provided. The second receiving groove 21 is opposite to the first receiving groove 11, so that the support rod 400 is received by the first receiving groove 11 and also by the second receiving groove.

[0067] The outer edge of the top of the inner attachment component 20 has external threads, and the inner pressure nut 42 has internal threads. The inner pressure nut 42 is screwed onto the top of the inner attachment component 20, and by tightening the inner pressure nut 42, the support rod 400 is pressed against the bottom of the second receiving groove 21, thereby forming a fixed connection between the inner attachment component 20 and the support rod 400. During the spinal correction process, the support rod 400 and the inner attachment component 20 must remain in a fixed connection state. The advantage of screwing the inner pressure nut 42 onto the top of the inner attachment component 20 with its internal threads engaging with the external threads of the inner attachment component 20 is that the covering effect of the inner pressure nut 42 on the top of the inner attachment component 20 can suppress deformation of the two sides separated by the second receiving groove 21 in opposite directions, thereby improving the rigidity of the inner attachment component 20.

[0068] An internal thread is provided on the cavity wall of the cylindrical cavity 12 on the inner edge of the top of the rod connecting body component 10, and an external thread is provided on the outer edge of the external pressure nut 41. The external pressure nut 41 is screwed onto the top of the rod connecting body component 10 by its external thread engaging with the internal thread of the rod connecting body component 10, so that it does not protrude radially from the rod connecting body component 10.

[0069] The first elastic component 30 is disposed between the inner attachment component 20 and the rod-connecting main body component 10. This first elastic component 30 allows the inner attachment component 20 to be elastically connected to the rod-connecting main body component 10. Furthermore, the first elastic component 30 allows the inner attachment component 20 to float when the outer pressure nut 41 is not tightened. At this time, the support rod 400 has a certain distance from the bottom of the first receiving groove 11. Specifically, the first elastic component 30 includes two symmetrically arranged radially inwardly curved elastic plates 31, and an upper connecting plate 32 and a lower connecting plate 33 integrally connected to the ends of the elastic plates 31. A stop groove is provided at the bottom of the cylindrical cavity 12 of the rod-connecting main body component 10. The lower connecting plate 33 is embedded in the stop groove, and a screw passes through the lower connecting plate 33 and is screwed into the solid at the bottom of the rod-connecting main body component 10. Preferably, a positioning shaft is disposed at the bottom of the lower connecting plate 33. A positioning protrusion is provided on the outer edge, and a limiting hole is provided at the bottom of the stop groove. A positioning groove is provided on the wall of the limiting hole. The positioning shaft is inserted into the limiting hole and the positioning protrusion enters the positioning groove, so that the bottom of the first elastic member 30 is detachably fixedly connected to the bottom of the column cavity 12. The upper connecting plate 32 is fixedly connected to the inner attachment member 20 by circumferentially arranged screws. In this way, the first elastic member 30 allows the inner attachment member 20 to float axially and pivot around the area where the elastic plate 31 is located by means of the elastic sheet 31.

[0070] The width of the opening of the first receiving groove 11 is configured to be equal to the diameter of the support rod 400, thereby restricting the rotation of the rod connecting body component 10 and the support rod 400 in a plane perpendicular to the axis of the rod connecting body component 10, and allowing the support rod 400 to pivot only within the plane (let's call it the first plane) defined by the first receiving groove 11 and passing through the axis of the rod connecting body component 10. After the outer pressure nut 41 is loosened and moved away from the support rod 400, as... Figure 2 and Figure 4 As shown, the first elastic member 30 resets, causing the support rod 400 to move away from the bottom of the first receiving groove 11. This allows the rod-connecting main body 10 and the support rod 400 to rotate relative to each other in the first plane. Furthermore, after pivoting, the two elastic plates 31 of the first elastic member 30 provide a reset tendency (force) for both. Figure 6 and Figure 7As shown, when the outer pressure nut 41 is tightened to directly or indirectly press against the support rod 400, causing the support rod 400 to press against the bottom of the two first receiving grooves 11, the support rod 400 and the rod connecting body component 10 are fixedly connected, thereby restricting the pivoting between the support rod 400 and the rod connecting body component 10. Therefore, the rod connecting assembly 100 of the present invention has a released state that allows the support rod 400 to pivot within the first plane defined by the first receiving groove 11 and a locked state that fixes the support rod 400 in the first receiving groove 11. Furthermore, by rotating the outer pressure nut 41 in both directions, the rod connecting assembly 100 can switch between the released state and the locked state.

[0071] In some preferred configurations, when the outer pressure nut 41 is tightened, it indirectly presses against the support rod 400 via the pressure-applying component 411. Specifically, the pressure-applying component 411 includes an attachment ring 413 and two symmetrically arranged pressure strips 412 integrally formed with the attachment ring 413. The attachment ring 413 is sleeved on the flat shaft at the bottom of the outer pressure nut 41 and is restricted from disengaging from the flat shaft by a retaining ring. Furthermore, the outer pressure nut 41 is rotatable relative to the attachment ring 413. Figure 2 and Figure 3 As shown, two pressure strips 412 are located in two first receiving grooves 11. Each pressure strip 412 has a matching strip 111 on each of its two sides, and each first receiving groove 11 has a matching groove 112 on each of its two groove walls. The matching strips 111 and matching grooves 112 cooperate to allow the pressure strip 412 to slide along the first receiving groove 11, thus preventing separation from the side wall of the rod-connected main body component 10. When the outer pressure nut 41 is tightened, the outer pressure nut 41 drives the pressure strip 412 to move towards the bottom of the first receiving groove 11, as shown... Figure 6 and Figure 7 As shown, this presses the support rod 400 against the bottom of the first receiving groove 11, thereby locking the rod connecting main component 10 and the support rod 400 together. The engagement of the pressure strip 412 with the side wall of the first receiving groove 11 restricts the deformation of the side walls on both sides of the first receiving groove from moving away from each other. Preferably, the bottom of the pressure strip 412 and the bottom of the first receiving groove 11 are both configured with a V-shaped structure, and the two inclined surfaces of the V-shaped structure press against the support rod 400 to fix the support rod 400.

[0072] The rod-connecting assembly 100 and the nail-connecting assembly 200 are configured to have a released state that allows them to pivot relative to each other in a second plane perpendicular to a first plane and perpendicular to the axis of the rod-connecting main body 10, and a locked state that restricts their relative pivoting. Furthermore, they can switch between the released and locked states. Specifically, as... Figure 4 and combined Figure 1As shown, a circular recess 54 is formed in the middle of the top end face 56 of the nail-connecting main body component 50, and a positioning hole 55 is formed in the middle of the bottom of the recess 54. An end shaft 14 is arranged in the middle of the bottom end face 13 of the rod-connecting main body component 10. The head of the end shaft 14 is inserted into the positioning hole 55 and the end shaft 14 is allowed to rotate, so that the rod-connecting main body component 10 and the nail-connecting main body component 50 can pivot relative to each other. The end shaft 14 and the recess 54 define an annular mounting cavity. A coil spring 90 is arranged in the mounting cavity as a second elastic component. The coil spring 90 has an inner end located in the radially inner side and an outer end located in the radially outer side. An inner slot is arranged on the outer peripheral surface of the end shaft 14, and an outer slot is formed on the groove wall of the recess 54. The inner end and the outer end of the coil spring 90 are inserted into the inner slot and the outer slot, respectively, so that the coil spring 90 provides a restoring tendency (force) after the rod-connecting main body component 10 and the nail-connecting main body component 50 pivot.

[0073] A connecting sleeve 80 is fitted between the outer edges of the rod-connecting main body component 10 and the nail-connecting main body component 50. The top outer edge of the nail-connecting main body component 50 has an outer step 53 facing the bone nail 300. The bottom of the connecting sleeve 80 has an inner step 82 facing the rod-connecting main body component 10. The inner step 82 abuts against the outer step 53. The bottom outer edge of the rod-connecting main body component 10 has an external thread, and the connecting sleeve 80 is screwed onto the rod-connecting main body component 10 via the external thread. The coil spring 90 has a certain axial misalignment from the outer ring to the inner ring, thus giving the coil spring 90 a certain axial elastic force. The bottom end face 13 of the rod-connecting main body component 10 and the top end face 56 of the nail-connecting main body component 50 are both configured as friction surfaces. These friction surfaces can be fabricated by machining rough surfaces on the end faces, thereby significantly increasing the friction force generated by the contact between the top end face 56 and the bottom end face 13. Thus, as... Figure 4 As shown, by rotating the connecting sleeve 80 in the forward direction towards the rod-connecting main body component 10, the inner step 82 and the outer step 53 work together to bring the top end face 56 of the nail-connecting main body component 50 closer to the bottom end face 13 of the rod-connecting main body component 10, ultimately forming a tight contact. This locks the rod-connecting main body component 10 and the nail-connecting main body component 50 together, strictly restricting their pivoting within the second plane. Figure 7 As shown, by reversing the rotation of the connecting sleeve 80 toward the bone screw 300, the top end face 56 of the nail-connecting main body component 50 is released from close contact with the rod-connecting main body component 10. The top end face 56 and the bottom end face 13 are kept separated from each other by the axial elastic force generated by the compression of the coil spring 90. This releases the nail-connecting main body component 50 and the rod-connecting main body component 10 to allow them to pivot relative to each other in the second plane.

[0074] A stepped portion is provided in the section near the bottom of the rod-connecting main body component 10, and the diameter of this section is smaller than the diameter of the main body of the rod-connecting main body component 10. The connecting sleeve 80 is screwed into this section. The outer edges of both the connecting sleeve 80 and the push nut 70 protrude radially beyond the outer edges of the main body of the rod-connecting main body component 10; that is, the diameters of the connecting sleeve 80 and the push nut 70 are larger than the diameter of the main body of the rod-connecting main body component 10, and the outer edge of the push nut 70 is larger than the outer edge of the connecting sleeve 80. The outer edge of the connecting sleeve 80 has circumferentially arranged notches 81, and the outer edge of the push nut 70 also has circumferentially arranged notches 71. Figure 5 As shown, the tool 2000 is used to perform a tightening operation. The tightening tool 2000 is a hollow tubular structure. The end of the tightening tool 2000 has a clearance notch for avoiding the support rod 400. The end of the tightening tool 2000 has a force arm 2001 for engaging with the notch. When it is necessary to tighten the push nut 70 or the connecting sleeve 80, the tightening tool 2000 with a radial dimension that is compatible with the push nut 70 or the connecting sleeve 80 is selected. It passes through the rod connecting body 10 from the top of the rod connecting body 10 in a sleeve manner and reaches the connecting sleeve 80 or the push nut 70 and engages with the notch. Then, tightening is applied. Because of the clearance notch, the tightening tool 2000 is allowed to tighten a certain angle at a time. In this way, continuous tightening can be performed by sequentially engaging different notches after the force arm 2001 is tightened. Preferably, the outer edge of the connecting sleeve 80 protrudes only slightly beyond the outer edge of the main body of the rod connecting main body component 10, and the outer edge of the push nut 70 protrudes only slightly beyond the outer edge of the connecting sleeve 80, thereby avoiding excessive protrusion.

[0075] Based on the above description of the connecting component 500, it can be understood that: by tightening the outer pressure nut 41 and tightening the connecting sleeve 80, the relative pivoting of the rod connecting main component 10 and the support rod 400 and the relative pivoting of the rod connecting main component 10 and the nail connecting main component 50 can be simultaneously restricted; by loosening the outer pressure nut 41 and loosening the connecting sleeve 80, the relative pivoting of the rod connecting main component 10 and the support rod 400 in the first plane and the relative rotation of the nail connecting main component 50 and the rod connecting main component 10 in the second plane can be simultaneously allowed; by loosening the outer pressure nut 41 and tightening the connecting sleeve 80, the relative pivoting of the rod connecting main component 10 and the support rod 400 in the first plane can be allowed, while the pivoting of the rod connecting main component 10 and the nail connecting main component 50 can be restricted; by tightening the outer pressure nut 41 and loosening the connecting sleeve 80, the relative pivoting of the rod connecting main component 10 and the support rod 400 can be restricted, while the pivoting of the rod connecting main component 10 and the nail connecting main component 50 can be allowed.

[0076] Based on the above-mentioned structural and functional characteristics of the combined component 500, the correction system provided by the present invention can achieve the following correction treatment.

[0077] When introducing the types of corrective treatments that the system can perform, we will first describe the system's relative position on the spine: such as Figure 8 and Figure 9 As shown, the entire system is located on the posterior side of the spine. Specifically, each bone screw 300 is screwed into the posterior side of the vertebra 1001, that is, into one side of the spinous process. Thus, the support rod 400 is also located on the posterior side of the spine, and the support rod 400 is arranged along the arrangement direction of the vertebra 1001. In this way, the first plane mentioned above is basically located in the sagittal plane of the spine, and the second plane mentioned above is basically located in the coronal plane of the spine. The flexion and extension of the human spine is actually achieved by the movement (pivot) of each vertebra 1001 in the sagittal plane, and the lateral bending of the human spine is actually achieved by the movement (pivot) of the vertebra 1001 in the coronal plane.

[0078] 1. The correction system can be applied to corrective and stabilizing treatments requiring complete rigid support for vertebrae 1001 in each segment of the spine. Specifically, by tightening the external pressure nut 41 and connecting sleeve 80 of the connecting component 500 corresponding to each bone screw 300, the support rod 400 is locked to the bone screw 300, thereby achieving rigid support of each vertebra 1001 by the support rod 400, and all mobility of each vertebra 1001 is inhibited.

[0079] 2. The correction system can be applied to corrective and stabilizing treatments requiring rigid support for certain segments of the spine vertebrae 1001 and dynamic support for other segments of the spine vertebrae 1001. By loosening the external pressure nut 41 and / or connecting sleeve 80 of the connecting component 500 corresponding to the vertebrae 1001 requiring dynamic support, the rod connecting main component 10 and the support rod 400 are allowed to pivot relative to each other in the sagittal plane, and / or the rod main connecting component 500 and the nail connecting main component 50 are allowed to pivot relative to each other in the coronal plane. This releases the range of motion of the bone nail 300 and the corresponding vertebrae 1001 in the sagittal plane and / or releases the range of motion in the coronal plane, thereby enabling the support rod 400 to provide dynamic support to the vertebrae 1001 that requires it.

[0080] 3. Orthodontic systems are especially suitable for correction:

[0081] An abnormal curvature has developed in the spine as a whole or in a considerable length of the spine, primarily occurring in the coronal plane, i.e., scoliosis. In this case, after correcting the individual vertebrae 1001 that are curving in the coronal plane due to torsion, the movement of the vertebrae 1001 in the coronal plane is inhibited by tightening the connecting sleeve 80 of the connecting component 500 corresponding to each vertebra 1001, thus stabilizing the vertebrae 1001 in the corrected posture. The movement of the vertebrae 1001 in the sagittal plane is released by loosening the external pressure nut 41, thereby preserving a certain degree of flexion and extension capacity of the spine during corrective treatment. This helps reduce the impact of corrective treatment on the intervertebral disc 1002 corresponding to the vertebrae 1001 and the surrounding muscle tissue.

[0082] An abnormal curvature has developed in the spine as a whole or in a considerable length of the spine, primarily occurring in the sagittal plane. After correcting the individual vertebrae 1001 that have developed sagittal curvature due to torsion in the sagittal plane, the external pressure nut 41 of the connecting component 500 corresponding to vertebrae 1001 is tightened to suppress the movement of vertebrae 1001 in the sagittal plane, thus stabilizing vertebrae 1001 in the corrected posture. The movement of vertebrae 1001 in the coronal plane is released by loosening the connecting sleeve 80, thereby preserving the lateral curvature of the spine during corrective treatment. This helps reduce the impact of corrective treatment on the intervertebral disc 1002 corresponding to vertebrae 1001 and the surrounding muscle tissue.

[0083] An abnormal curvature has developed in the entire spine or in a considerable localized area, with curvature present in both the coronal and sagittal planes. In this situation, it is easily understood that for the vertebra 1001 corresponding to the segment of the spine curving in the coronal plane, its mobility in the coronal plane is inhibited while its mobility in the sagittal plane is released; similarly, for the vertebra 1001 corresponding to the segment of the spine curving in the sagittal plane, its mobility in the sagittal plane is inhibited while its mobility in the coronal plane is released.

[0084] The connecting component 500 and the dynamic correction system provided by this invention have at least the following advantages:

[0085] 1. The range of motion of the vertebra 1001 supported by the support rod 400 in the coronal plane and in the sagittal plane can be independently released and inhibited by the connecting component 500 provided by the present invention, thereby enabling the correction system to be applied to correct and stabilize more types of spinal deformities and expanding its scope of application.

[0086] 2. The combination component 500 enables the correction system to provide not only rigid support but also dynamic support for the vertebrae 1001 of the spine. Furthermore, the combination component 500 enables the system to provide not only full dynamic support by simultaneously releasing the range of motion of the vertebrae 1001 in the sagittal and coronal planes, but also directional dynamic support by releasing the range of motion of the vertebrae 1001 in either the sagittal or coronal planes.

[0087] 3. The present invention configures the part of the connecting component 500 for connecting with the support rod 400 and the part for connecting with the bone nail 300 as two separate components that can pivot relative to each other in the coronal plane and can be fixed to each other, thereby enabling control over the release and inhibition of the range of motion of the vertebra 1001 in the coronal plane.

[0088] 4. The outer edges of the connecting sleeve 80 and the push nut 70 are configured to be larger than the outer edge of the rod-connecting main body component 10, so that the sleeve-type screwing tool 2000 can pass through the rod-connecting main body component 10 to perform screwing operations on the connecting sleeve 80 and the push nut 70.

[0089] 5. The outer pressure nut 41 and the connecting sleeve 80 are coaxially arranged with the inner pressure nut 42 and the push sleeve 60, and are all arranged along the axis of the rod-connecting main body component 10. This allows the switching of the support state of the vertebra 1001 (switching between rigid support and dynamic support) to be achieved simply by using the screwing tool 2000 to axially align the outer pressure nut 41 and the connecting sleeve 80 and then screwing them. There is no need to screw the outer pressure nut 41 and the connecting sleeve 80 from the side, thereby avoiding restrictions on the screwing operation and interference with other areas of the vertebra 1001.

[0090] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0091] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments may be used by those skilled in the art upon reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiment. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being possible in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0092] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A bone screw connecting component, characterized in that, include: The rod assembly is provided with a receiving groove for receiving the support rod; A nail-jointing assembly having a covered cavity for receiving and clamping a spherical nail head of a bone nail; wherein: The rod coupling assembly is configured to have a released state that allows the support rod to pivot within a first plane defined by the receiving groove and a locked state that secures the support rod in the receiving groove, and the rod coupling assembly is capable of switching between the released state and the locked state. The relationship between the rod-connecting assembly and the nail-connecting assembly is configured to have a released state that allows both to pivot relative to each other in a second plane perpendicular to the first plane and a locked state that restricts their relative pivoting, and both can switch between the released state and the locked state. A first elastic member is provided in the rod connection assembly, the first elastic member being used to provide a restoring force after the rod connection assembly and the support rod have pivoted relative to each other. A second elastic member is disposed between the rod-connecting assembly and the nail-connecting assembly, the second elastic member being used to provide a restoring force after the rod-connecting assembly and the nail-connecting assembly have pivoted relative to each other; The rod-connecting assembly includes at least a rod-connecting main body component, and the receiving groove includes a first receiving groove disposed on the rod-connecting main body component; the nail-connecting assembly includes at least a nail-connecting main body component, and the covering cavity is disposed in the nail-connecting main body component and extends through its bottom to form an entrance to the covering cavity for the nail head of the bone nail to enter; wherein: An end shaft is provided on the bottom end face of the rod-connecting main body component, and a groove is provided on the top end face of the nail-connecting main body component. A positioning hole is provided at the bottom of the groove, and the end shaft is inserted into the positioning hole; the second elastic component is a coil spring, which is disposed in the groove and its two ends are respectively connected to the end shaft and the groove wall of the groove. The outer edge of the top of the nail-connected main body component is provided with an outer step. A connecting sleeve is provided between the nail-connected main body component and the rod-connected main body component. The connecting sleeve is screwed into the rod-connected main body component. The connecting sleeve is provided with an inner step. The inner step cooperates with the outer step so that the top end face and the bottom end face can be tightly contacted or separated by twisting the connecting sleeve in both directions.

2. The bone screw connecting component according to claim 1, characterized in that, The bottom end face of the rod-joining main component and the top end face of the nail-joining main component are configured as rough surfaces to increase the friction when they come into contact. Provides an elastic force between the rod-connecting main body component and the rod-connecting main body component, causing the two to tend to move away from each other.

3. The bone screw connecting component according to claim 1, characterized in that, The screw-connecting assembly further includes: a push sleeve and a push nut; the covering cavity is formed by a plurality of circumferentially arranged covering flaps; the push sleeve and the push nut are coaxially sleeved outside the screw-connecting main body component, and the push nut is screwed into the screw-connecting main body component, thereby fixing the screw cap of the bone screw in the covering cavity by the push nut pushing against the push sleeve; wherein: The push nut and the connecting sleeve are coaxial and spaced apart. The outer edges of the push nut and the connecting sleeve are both provided with operating parts for engaging with a screwing tool. The outer edges of the push nut and the connecting sleeve both protrude radially beyond the outer edge of the rod-connecting main body component. The outer edge of the push nut also protrudes radially beyond the outer edge of the connecting sleeve, so as to allow the screwing tool to pass through the rod-connecting main body component to reach the connecting sleeve and the push nut and engage with their operating parts.

4. The bone screw connecting component according to claim 1, characterized in that, The rod assembly further includes: an inner attachment component, an outer pressure nut, and an inner pressure nut; The inner attachment component is disposed in the cylindrical cavity of the rod-connecting main component, and its cavity wall has a gap. The receiving groove includes a second receiving groove disposed on the inner attachment component and opposite to the first receiving groove, the second receiving groove being used to receive the support rod; wherein: The inner pressure nut is screwed onto the top of the inner attachment component to fix the inner attachment component to the support rod; The external pressure nut is screwed onto the top of the rod-connecting main body component to restrict or allow the support rod to pivot by directly or indirectly pressing against or releasing the pressure on the support rod. The first elastic component is disposed between the inner attachment component and the rod-connecting main body component.

5. The bone screw connecting component according to claim 4, characterized in that, The first elastic member is disposed between the bottom of the inner attachment member and the bottom of the column cavity of the rod-connecting main body member; the first elastic member has two radially inwardly bent elastic plates arranged symmetrically and two connecting parts for attaching to the bottom of the inner attachment member and the bottom of the column cavity, respectively.

6. The bone screw connecting component according to claim 4, characterized in that, The bottom of the external pressure nut is attached to a pressure-applying component, and the external pressure nut is rotatable relative to the pressure-applying component; wherein: The pressure-applying component has a pressure strip located in the first receiving groove and slidable thereal. The pressure strip is driven by an external pressure nut and presses against the support rod. The side of the pressure strip fits into the groove wall of the first receiving groove to limit the two groove walls of the first receiving groove from moving away from each other.

7. The bone screw connecting component according to claim 6, characterized in that, The bottom of the pressure bar and the bottom of the first receiving groove are both configured in a V-shape.

8. A dynamic spinal correction system, comprising: The support rod and multiple bone screws are characterized in that they further include a bone screw connecting component as described in any one of claims 1 to 7, wherein: Each bone screw is connected to the support rod via the bone screw connection component.

Images