Vertebral body distraction device

Abstract

The invention relates to a vertebral body distraction device. The device comprises a pedicle screw, a supporting assembly, a fixing assembly and a distraction assembly connected with the pedicle screw in the axial direction. The distraction assembly comprises two supporting plates, and the two supporting plates are arranged in the radial direction of the pedicle screw in a spaced mode. A mounting channel is formed in the supporting assembly, and the supporting assembly is used for being inserted between the two supporting plates so as to open and support the two supporting plates; the fixing assembly is used for being inserted into the mounting channel so as to open and support the supporting assembly. The supporting assembly is inserted between the two supporting plates, and the fixing assembly is inserted in the mounting channel, so that the two supporting plates are expanded, that is, compared with the prior art, a hollow expanding assembly is converted into a solid expanding assembly, the stability of the expanding assembly is improved, bone cement can be prevented from being used for improving the stability of the expanding assembly, and the use cost of the expanding assembly is reduced. And therefore, the problems of leakage and the like caused by bone cement in the injection process are avoided, and the reliability of the vertebral body distraction device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vertebral distraction device. Background Art

[0002] When a vertebral body suffers from compression fractures due to trauma, especially when accompanied by osteoporosis, the usual treatment method is: first, a minimally invasive channel is established through a pedicle screw, then a special instrument is used to restore the original height of the vertebral body, and then bone cement is injected into the vertebral body through the minimally invasive channel to fix it. In the prior art, a stent is often erected to expand the expansion component to partially restore the height of the affected vertebra, and then bone cement is injected into the hollow expansion component to stabilize the fractured vertebra. However, the flowing bone cement will cause leakage and other problems during the injection process, thereby inducing changes in the biomechanical state of the vertebral body, accelerated degeneration, and adjacent vertebral fractures, re-fractures and other problems. Summary of the invention

[0003] Based on this, it is necessary to provide a vertebral distraction device to address the technical problems in which the existing technology often uses a stent to expand the distraction component to achieve partial recovery of the height of the affected vertebra, and then inject bone cement into the hollow distraction component to achieve stability of the fractured vertebra. However, the flowing bone cement will cause leakage and other problems during the injection process, which will in turn induce changes in the biomechanical state of the vertebra, accelerated degeneration, and adjacent vertebral fractures and re-fractures.

[0004] A vertebral distraction device, comprising:

[0005] A pedicle screw and a distraction assembly connected to the pedicle screw along the axial direction, wherein the distraction assembly comprises two support plates, and the two support plates are arranged at intervals along the radial direction of the pedicle screw;

[0006] A support assembly, wherein a mounting channel is provided in the support assembly, and the support assembly is used to be inserted between the two support plates to spread and support the two support plates;

[0007] A fixing component is used to be inserted into the installation channel to prop open and support the supporting component.

[0008] In one embodiment, the support assembly includes at least one plug-in block, the plug-in block includes two supporting bodies arranged opposite to each other, the two supporting bodies are connected to each other, and a mounting groove is provided between the two supporting bodies; wherein:

[0009] When the support assembly includes an insert block, the installation slot of the insert block is configured as the installation channel, and the fixing assembly is inserted into the installation slot to prop the two support plates apart;

[0010] When the support assembly includes more than one plug-in block, each of the plug-in blocks is inserted and matched in sequence, and the two support bodies of each of the plug-in blocks are separated. All of the support bodies are stacked in sequence radially from the inside to the outside along both sides of the pedicle screw, and the installation groove of the innermost plug-in block is configured as the installation channel. The fixing assembly is inserted into the installation groove to spread the two support plates apart.

[0011] In one embodiment, one end of the insert block is provided with an introduction end, and the other end is provided with a guide groove, the guide groove is located between the two support bodies of the insert block, and the guide groove is configured to be at least part of the installation groove;

[0012] In any two adjacent plug-in blocks that are plug-fitted, the guide groove of the plug-in block located on the outside is used for the insertion end of the plug-in block located on the inside.

[0013] In one embodiment, the outer sides of the two supporting bodies of the plug block are provided with protrusions extending along the plugging direction, and the inner sides of the two supporting bodies are provided with grooves corresponding to the protrusions;

[0014] In any two adjacent plug-in blocks that are plug-fitted, the protrusion of the plug-in block located on the inner side is slidably guided and matched with the groove of the plug-in block located on the outer side.

[0015] In one embodiment, a first limiting wall is provided on the outer side of each support body, and a second limiting wall corresponding to the first limiting wall is provided on the inner side. In any two adjacent plug-in blocks that are plugged in, the first limiting wall of the support body located on the inner side abuts against the second limiting wall of the support body located on the outer side to limit the movement of the support body located on the inner side relative to the support body located on the outer side along the plug-in direction of the plug-in block.

[0016] In one embodiment, a first abutment wall is provided on opposite sides of the two support plates, and the first abutment wall is used to abut against the first limiting wall on the support body of the outermost plug block to limit the movement of the support body relative to the support assembly along the plug-in direction.

[0017] In one embodiment, the fixing assembly is provided with a limiting portion and two second abutment walls, the fixing assembly is passed through the pedicle screw, the limiting portion is used to cooperate with the pedicle screw in a limiting manner, and the second abutment wall is used to abut against the second limiting wall on the support body of the innermost plug block to limit the movement of the support body relative to the expansion assembly in a direction opposite to the insertion direction.

[0018] In one embodiment, the pedicle screw is provided with a through hole for accommodating the fixing assembly, and the hole wall of the through hole at one end away from the expansion assembly is provided with an internal thread. The fixing assembly also includes a blocking block, which is used to be threadedly connected to the hole wall of the through hole, and the thread on the outer wall of the blocking block forms the limiting portion.

[0019] In one embodiment, the fixing assembly includes a fixing rod and a fixing block, the fixing block is located in the installation channel, the fixing block includes a slider and a support block that penetrate the fixing rod, the support block includes a fixing column and two oppositely arranged support platforms, one side of the two support platforms is connected to the fixing column, and the other side is surrounded by a support groove;

[0020] The slider is at least partially accommodated in the expansion groove, the fixing rod is threadedly connected to the slider, and the fixing rod is configured to rotate around the axis of the pedicle screw to drive the slider to move toward the support platform to expand the two support platforms away from one side of the fixing column to adjust the expansion angle of the two support plates.

[0021] In one embodiment, the expansion assembly also includes a connecting seat and a plurality of connecting arms, wherein the connecting seat is located on a side of the support plate away from the pedicle screw, one end of each of the support plates is connected to the pedicle screw via at least one connecting arm, and the other end is connected to the connecting seat via at least one connecting arm, and the connecting arms are used to support the corresponding support plates when the two support plates are relatively expanded.

[0022] Beneficial effects:

[0023] The vertebral distraction device provided by the embodiment of the present invention includes a pedicle screw, a support assembly, a fixing assembly, and a distraction assembly connected to the pedicle screw along the axial direction; the distraction assembly includes two support plates, and the two support plates are arranged at intervals along the radial direction of the pedicle screw; a mounting channel is provided in the support assembly, and the support assembly is used to be inserted between the two support plates to distract and support the two support plates; the fixing assembly is used to be inserted in the mounting channel to distract and support the support assembly. In the present application, the two support plates are distracted by inserting the support assembly between the two support plates of the distraction assembly, and the fixing assembly is inserted in the mounting channel in the support assembly. That is, compared with the prior art, the present application converts the hollow distraction assembly into a solid one, thereby improving the stability of the distraction assembly, thereby avoiding the use of bone cement to increase the stability of the distraction assembly, thereby avoiding the leakage of bone cement during the injection process, and improving the reliability of the vertebral distraction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a vertebral distraction device provided by an embodiment of the present invention Figure 1 .

[0025] Figure 2 A cross-sectional view of a vertebral distraction device provided in accordance with an embodiment of the present invention Figure 1 .

[0026] Figure 3 A schematic diagram of an insert in a vertebral distraction device provided in one embodiment of the present invention.

[0027] Figure 4 A cross-sectional view of an insert in a vertebral distraction device provided in one embodiment of the present invention.

[0028] Figure 5 A schematic diagram of a pedicle screw and a distraction assembly in a vertebral distraction device provided in one embodiment of the present invention.

[0029] Figure 6 A cross-sectional view of a pedicle screw and a distraction assembly in a vertebral distraction device provided in one embodiment of the present invention.

[0030] Figure 7 A schematic diagram of a fixing assembly in a vertebral distraction device provided in one embodiment of the present invention.

[0031] Figure 8 A cross-sectional view of a fixing assembly in a vertebral distraction device provided in one embodiment of the present invention.

[0032] Fig. 9 Schematic diagram of a vertebral distraction device provided by an embodiment of the present invention Figure 2 .

[0033] Fig.10 A schematic diagram of a fixing assembly in a vertebral distraction device according to another embodiment of the present invention.

[0034] Fig.11 A schematic diagram of a fixing block in a vertebral distraction device provided in another embodiment of the present invention.

[0035] Fig.12 A schematic diagram of a fixing rod in a vertebral distraction device provided in another embodiment of the present invention.

[0036] Figure Number:

[0037] 100-pedicle screw; 110-through hole; 120-internal thread; 200-opening assembly; 210-support plate; 211-first abutting wall; 220-connecting arm; 221-third deformation groove; 222-fourth deformation groove; 230-connecting seat; 240-fusion layer; 300-support assembly; 310-insertion block; 320-support body; 321-first limiting wall; 322-second limiting wall; 323-protrusion; 324-groove; 330-guide groove; 340-introduction end; 350-first weak connection structure; 360-second weak connection structure; 400-fixing assembly; 410-second abutment wall; 420-fixing rod; 421-third limiting wall; 422-external thread; 423-operating end; 424-threaded end; 426-connecting end; 427-fourth limiting wall; 430-fixing block; 431-guide protrusion; 440-slider; 441-guide end; 450-support block; 451-support table; 452-spreading groove; 453-first deformation groove; 454-second deformation groove; 455-fixing column; 460-blocking block. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0044] See also Figure 1 , Figure 1 Schematic diagram of a vertebral distraction device provided by an embodiment of the present invention Figure 1 A vertebral distraction device provided in one embodiment of the present invention includes a pedicle screw 100, a support assembly 300, a fixing assembly 400, and a distraction assembly 200 connected to the pedicle screw along the axial direction; the distraction assembly 200 includes two support plates 210, and the two support plates 210 are arranged at intervals along the radial direction of the pedicle screw 100; a mounting channel is provided in the support assembly 300, and the support assembly 300 is used to be inserted between the two support plates 210 to distract and support the two support plates 210; the fixing assembly 400 is used to be inserted in the mounting channel to distract and support the support assembly 300.

[0045] Specifically, in the present application, a support assembly 300 is inserted between the two support plates 210 of the distraction assembly 200, and a fixing assembly 400 is inserted into the installation channel of the support assembly 300 to distract the two support plates 210. That is, compared with the prior art, the present application converts the hollow distraction assembly 200 into a solid one, thereby improving the stability of the distraction assembly 200, thereby avoiding the use of bone cement to increase the stability of the distraction assembly 200, thereby avoiding problems such as leakage of bone cement during the injection process, and improving the reliability of the vertebral distraction device.

[0046] The support assembly 300 inserted between the two support plates 210 can be adjusted to adjust the support height between the two support plates 210, thereby supporting the vertebral body to a preset height.

[0047] See also Figure 2 and Figure 3 , Figure 3 A schematic diagram of an insert in a vertebral distraction device provided in one embodiment of the present invention. In one embodiment, the support assembly 300 includes at least one insert 310, and the insert 310 includes two oppositely disposed support bodies 320, the two support bodies 320 are connected to each other, and a mounting groove is provided between the two support bodies 320; wherein:

[0048] When the support assembly 300 includes an insert block 310, the installation groove of the insert block 310 is configured as an installation channel, and the fixing assembly 400 is inserted into the installation groove and applies force to the two supports 320, so that the connection between the two supports 320 is disconnected and radially moved outward along the two sides of the pedicle screw 100 to open the two support plates 210;

[0049] When the support assembly 300 includes more than one plug block 310, each plug block 310 is inserted and matched in sequence, and the two support bodies 320 of each plug block 310 are separated. All the support bodies 320 are stacked in sequence from the inside to the outside along the two sides of the pedicle screw 100 radially. The installation groove of the innermost plug block 310 is configured as a installation channel. The fixing assembly 400 is inserted into the installation groove and applies force to the two support bodies 320 to disconnect the connection between the two support bodies 320 and move radially outward along the two sides of the pedicle screw 100 to open the two support plates 210.

[0050] Specifically, the insert block 310 has an initial state and a deformed state. When the insert block 310 is in the initial state, the two supports 320 in the insert block 310 are connected to each other, and a mounting groove is provided between the two supports 320. When the height of the support assembly 300 is determined, that is, the number of insert blocks 310 inserted into the expansion assembly 200 is determined, when there is only one insert block 310, the insert block 310 is inserted between the two support plates 210, and then the fixing assembly 400 is inserted into the mounting groove, and force is applied to the two supports 320 to disconnect the connection between the two supports 320, and move radially outward along both sides of the pedicle screw 100 to expand the two support plates 210, so that the insert block 310 is converted into a deformed state, so that the two support plates 210 are relatively expanded to a preset height.

[0051] When the plug block 310 exceeds one plug block 310, one of the plug blocks 310 in the initial state is inserted between the two support plates 210, and the remaining plug blocks 310 in the initial state are inserted in sequence between the two support bodies 320 of the previous plug block 310 that has been inserted, that is, the plug block 310 to be inserted is inserted into the installation groove of the inserted plug block 310 to separate the two support bodies 320 of the inserted plug block 310, so that each plug block 310 is stacked in sequence from the inside to the outside along the radial direction of the pedicle screw 100 between the two support plates 210, and finally the fixing assembly 400 is inserted into the installation groove of the innermost plug block 310, so that the two support plates 210 are relatively stretched to a preset height.

[0052] In the present application, by controlling the number of inserting blocks 310 inserted into the distraction assembly 200, the distraction height of the two support plates 210 in the distraction assembly 200 is adjusted, thereby facilitating the accurate design of the height of the distraction end surface and improving the distraction accuracy of the vertebral distraction device. Among them, the side of each support plate 210 away from the fixing assembly 400 is used to support the vertebral body and is the distraction end surface.

[0053] Furthermore, the expanded end surface can be arc-shaped or flat. A porous fusion layer 240 is also provided on the side of the support plate 210 away from the fixing assembly 400 to facilitate the growth of the vertebral body.

[0054] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, an introduction end 340 is provided at one end of the plug block 310, and a guide groove 330 is provided at the other end. The guide groove 330 is located between two support bodies 320 of the plug block 310, and the guide groove 330 is configured as at least a partial installation groove; in any two adjacent plug blocks 310 that are plug-in matched, the guide groove 330 of the plug block 310 located on the outside is used for the introduction end 340 of the plug block 310 located on the inside to be inserted.

[0055] Specifically, when the fixing component 400 is not inserted, in the plug-in mating plug-in block 310, the two supporting bodies 320 located at the innermost plug-in block 310 have not been separated, that is, there is a mounting groove between the two supporting bodies 320, and when the plug-in block 310 in the initial state is inserted between the two supporting bodies 320 of the previous plug-in block 310 that has been plugged in, the plug-in block 310 in the initial state is inserted into the mounting groove through the introduction end 340, and under the action of external force, the plug-in block 310 in the initial state is relatively moved relative to the previous plug-in block 310 that has been plugged in, thereby facilitating the separation of the two supporting bodies 320 located at the innermost plug-in block 310, realizing plug-in mating, and increasing the distance between the two support plates 210.

[0056] Furthermore, the introduction end 340 is a conical protrusion, and the corresponding guide groove 330 is a conical groove.

[0057] Furthermore, in the initial state, there is a gap between the two support bodies 320, and the plug block 310 further includes a first weak connection structure 350 and a second weak connection structure 360. The two support bodies 320 are connected at one side close to the introduction end 340 through the first weak connection structure 350, and the two support bodies 320 are connected at one side close to the installation groove through the second weak connection structure 360. In the plug-in mating plug blocks 310, when the innermost plug block 310 moves relative to its adjacent plug block 310, the innermost plug block 310 can break the first weak connection structure 350 and the second weak connection structure 360 ​​of the corresponding plug block 310, so that the two support bodies 320 are easy to separate.

[0058] It should be noted that in the initial state, in one insert block 310, the gap between the two supports 320 and the guide groove 330 together form a mounting groove. When the fixing assembly 400 is inserted into the mounting channel, the area between the two innermost supports 320 forms the mounting channel.

[0059] See also Figure 2 , Figure 3 and Figure 4 , Figure 4 A cross-sectional view of an insert in a vertebral distraction device according to an embodiment of the present invention. In one embodiment, the outer sides of the two support bodies 320 of the insert 310 are provided with protrusions 323 extending along the plugging direction, and the inner sides of the two support bodies 320 are provided with grooves 324 corresponding to the protrusions 323; in any two adjacent inserts 310 that are plugged together, the protrusions 323 of the insert 310 located on the inner side are used for sliding and guiding cooperation with the grooves 324 of the insert 310 located on the outer side.

[0060] Specifically, the outer side of each plug block 310 is provided with a protrusion 323 extending in the plugging direction, and the inner side is provided with a groove 324 corresponding to the protrusion 323. Such a configuration can guide the plug block 310 in the initial state when it is inserted between the two support bodies 320 of the previous plug block 310 that has been inserted, so that all the support bodies 320 can be stacked and arranged in sequence from the inside to the outside along the radial direction of the pedicle screw 100 between the two support plates 210 to stably open the two support plates 210. Preferably, the protrusion 323 is arranged at the center of the plug block 310.

[0061] See also Figure 2 , Figure 3 and Figure 4 In one embodiment, a first limiting wall 321 is provided on the outer side of each support body 320, and a second limiting wall 322 corresponding to the first limiting wall 321 is provided on the inner side. In any two adjacent plug-in blocks 310 that are plugged in, the first limiting wall 321 of the support body 320 located on the inner side abuts against the second limiting wall 322 of the support body 320 located on the outer side to limit the movement of the support body 320 located on the inner side relative to the support body 320 located on the outer side along the plug-in direction of the plug-in block 310.

[0062] Specifically, on each support body 320, the side of the protrusion 323 close to the introduction end 340 is configured as a first limiting wall 321, and the side of the groove 324 close to the introduction end 340 is configured as a second limiting wall 322. In any two adjacent plug-in blocks 310 that are plugged in, the second limiting wall 322 in the plug-in block 310 located on the outside abuts against the first limiting wall 321 in the plug-in block 310 located on the inside, thereby limiting the movement of the support body 320 located on the inside relative to the support body 320 located on the outside along the plug-in direction of the plug-in block 310, and limiting the movement of the support body 320 located on the outside relative to the support body 320 located on the inside in the direction opposite to the plug-in direction of the plug-in block 310, so that each plug-in block 310 is stably inserted into the distraction assembly 200, thereby improving the stability of the vertebral distraction device.

[0063] Figure 2-Figure 6 , Figure 5 A schematic diagram of a pedicle screw and a distraction assembly in a vertebral distraction device provided in one embodiment of the present invention; Figure 6 A cross-sectional view of a pedicle screw and a distraction assembly in a vertebral distraction device provided in one embodiment of the present invention. In one embodiment, a first abutment wall 211 is provided on opposite sides of two support plates 210, and the first abutment wall 211 is used to abut against a first limiting wall 321 on a support body 320 of an outermost plug block 310 to limit the movement of the support body 320 relative to the distraction assembly 200 along the plugging direction.

[0064] Specifically, in the plug-in mating plug block 310, the first limiting wall 321 located on the outermost side is used to abut against the first abutting wall 211, thereby limiting the movement of the outermost plug block 310 relative to the distraction assembly 200, and in any two adjacent plug-in mating plug blocks 310, the plug block 310 located on the outer side can limit the movement of the plug block 310 located on the inner side along the plug-in direction of the plug block 310, thereby limiting the movement of each plug block 310 along the plug-in direction of the plug block 310, so that each plug block 310 is stably inserted in the distraction assembly 200, thereby improving the stability of the vertebral distraction device.

[0065] See also Figure 2-Figure 4 and Figure 7-Figure 8 , Figure 7 A schematic diagram of a fixing assembly in a vertebral distraction device provided in one embodiment of the present invention; Figure 8 A cross-sectional view of a fixing assembly in a vertebral distraction device provided in one embodiment of the present invention. In one embodiment, the fixing assembly 400 is provided with a limiting portion and two second abutting walls 410, the fixing assembly 400 is inserted into the pedicle screw 100, the limiting portion is used to limit the position of the pedicle screw 100, and the second abutting wall 410 is used to abut against the second limiting wall 322 on the support body 320 of the innermost plug block 310 to limit the support body 320 from moving relative to the distraction assembly 200 in a direction opposite to the plugging direction.

[0066] Specifically, due to the limited fit between the limiting portion and the pedicle screw 100, the relative position of the fixing assembly 400 and the pedicle screw 100 can be limited. In the plug-in block 310 that is plugged in, the second limiting wall 322 located on the innermost side is used to abut against the second abutting wall 410, thereby limiting the movement of the innermost plug-in block 310 relative to the distraction assembly 200, and in any two adjacent plug-in blocks 310 that are plugged in, the plug-in block 310 located on the inner side can limit the movement of the plug-in block 310 located on the outer side in the direction opposite to the plug-in direction of the plug-in block 310, thereby limiting the movement of each plug-in block 310 in the direction opposite to the plug-in direction of the plug-in block 310, so that each plug-in block 310 is stably inserted in the distraction assembly 200, thereby improving the stability of the vertebral distraction device.

[0067] It should be noted that the plug blocks 310 in the expansion assembly 200 are inserted sequentially, so the first abutment wall 211 and the second limiting wall 322 will not interfere with the plug block 310 in the initial state inserted between the two support bodies 320 of the previous plug block 310 that has been inserted.

[0068] See also Figure 6 , Figure 7 and Figure 8In one embodiment, a through hole 110 for accommodating a fixing assembly 400 is provided in the pedicle screw 100, and an internal thread 120 is provided on the hole wall of the through hole 110 at one end away from the distraction assembly 200. The fixing assembly 400 also includes a blocking block 460, which is used to be threadedly connected to the hole wall of the through hole 110, and the thread on the outer wall of the blocking block 460 forms a limiting portion.

[0069] Specifically, the blocking block 460 is threadedly connected to the wall of the through hole 110, so that the fixing assembly 400 is stably connected to the pedicle screw 100, and the fixing assembly 400 is easily installed relative to the pedicle screw 100, thereby improving the installation efficiency of the vertebral distraction device.

[0070] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 In one embodiment, the expansion assembly 200 further includes a connecting seat 230 and a plurality of connecting arms 220. The connecting seat 230 is located on a side of the support plate 210 away from the pedicle screw 100. One end of each support plate 210 is connected to the pedicle screw 100 through at least one connecting arm 220, and the other end is connected to the connecting seat 230 through at least one connecting arm 220. The connecting arm 220 is used to support the corresponding support plate 210 when the two support plates 210 are relatively expanded.

[0071] Specifically, the setting of the connecting arm 220 allows the two support plates 210 to always maintain a stable connection with the pedicle screw 100 during the relative expansion process, thereby improving the stability of the vertebral support device. In addition, the setting of the connecting arm 220 increases the support points for supporting the support plate 210, so that the support plate 210 has a more superior support performance and improves the reliability of the vertebral expansion device.

[0072] See also Figure 1 , Figure 2 and Figure 6 In one embodiment, a third deformation groove 221 is formed at the end of each connecting arm 220 close to the corresponding support plate 210, and the notch of the third deformation groove 221 faces one side of the fixing assembly 400, so that each connecting arm 220 is close to one end of the corresponding support plate 210, and driven by the corresponding support plate 210, it rotates toward the side close to the support plate 210, so as to support the corresponding support plate 210.

[0073] See also Figure 1 , Figure 2 and Figure 6In one embodiment, a fourth deformation groove 222 is formed at the end of each connecting arm 220 away from the corresponding support plate 210, and the notch of the fourth deformation groove 222 faces the side away from the fixing assembly 400, so that it is convenient for each connecting arm 220 to move away from the corresponding support plate 210 and rotate to the side away from the support plate 210 under the drive of the corresponding support plate 210, so as to facilitate supporting the corresponding support plate 210.

[0074] In the present application, both ends of each support plate 210 can provide supporting force under the support of at least two connecting arms 220. At the same time, by setting the third deformation groove 221 and the fourth deformation groove 222 on the connecting arm 220, the deformation point of each connecting arm 220 can be controlled, avoiding the deformation point deviation that causes structural deformity, thereby improving the reliability of the vertebral distraction device.

[0075] In other embodiments, the deformation structures at both ends of each connecting arm 220 can be adjusted to a hinge structure or other structure that can rotate around an axis to achieve deformation.

[0076] See also Figure 9-12 , Fig. 9 Schematic diagram of a vertebral distraction device provided by an embodiment of the present invention Figure 2 ; Fig.10 A schematic diagram of a fixing assembly in a vertebral distraction device provided by another embodiment of the present invention; Fig.11 A schematic diagram of a fixing block in a vertebral distraction device provided by another embodiment of the present invention; Fig.12 A schematic diagram of a fixing rod in a vertebral distraction device provided in another embodiment of the present invention. In one embodiment, a fixing assembly 400 includes a fixing rod 420 and a fixing block 430, the fixing block 430 is located in the installation channel, the fixing block 430 includes a slider 440 and a support block 450 that penetrates the fixing rod 420, the support block 450 includes a fixing column 455 and two oppositely arranged support platforms 451, one side of the two support platforms 451 is connected to the fixing column 455, and the other side is surrounded by a distraction groove 452; the slider 440 is at least partially accommodated in the distraction groove 452, the fixing rod 420 is threadedly connected to the slider 440, and the fixing rod 420 is configured to rotate around the axis of the pedicle screw 100 to drive the slider 440 to move toward the support platform 451 to distract the two support platforms 451 away from the fixing column 455, so as to adjust the distraction angle of the two support plates 210.

[0077] Specifically, the second abutting wall 410 is arranged on the support block 450, the blocking block 460 is connected to the fixing rod 420, and the two support platforms 451 are respectively used to abut against the two innermost support bodies 320. When the fixing rod 420 rotates around its own axis, the slider 440 can be driven to move relative to the support platform 451 through thread transmission. Since the slider 440 is accommodated in the expansion groove 452 surrounded by the two support platforms 451, the slider 440 can apply a component force radially outward along the pedicle screw 100 to the two support platforms 451 under the drive of the fixing rod 420, so that the two support platforms 451 are expanded away from the fixed column 455. The opening angle of the two support plates 210 on the side away from the fixed column 455 is greater than the other side, so that the two ends of the expansion end surface can have different heights, and then can adapt to different support requirements of the vertebral body, that is, the precise expansion and angle control of the vertebral body expansion device is realized, and the expansion accuracy and adaptability of the vertebral body expansion device are improved.

[0078] Furthermore, the expansion groove 452 is V-shaped, and the shape of the slider 440 matches the shape of the expansion groove 452 .

[0079] Furthermore, the fixing rod 420 is provided with a threaded end 424, which is used for threaded connection with the slider 440. The fixing column 455 is also provided with a fourth limiting wall 427, which is located at one end of the threaded end 424 close to the blocking block 460, and is used to abut against the slider 440 to limit the movement of the slider 440 relative to the support platform 451, to prevent the two support platforms 451 from being opened at too large an angle, so that the two support platforms 451 are separated from the fixing column 455, thereby improving the stability of the vertebral body distraction device.

[0080] See also Figure 1 , Figure 2 , Figure 7 and Figure 8 In other embodiments, if the opening angle of the opening end face does not need to be adjusted, the fixing block 430 can be made into a whole. In one embodiment, the blocking block 460 and the fixing rod 420 are integrally formed, and the fixing block 430 and the fixing rod 420 are interference fit, so that when the blocking block 460 is rotated to make the blocking block 460 threadedly connected with the internal thread 120, interference with the fixing block 430 can be reduced.

[0081] See also Figure 7 , Figure 8 , Fig.10 and Fig.12In one embodiment, the fixing column 455 is located on the side of the support platform 451 close to the pedicle screw 100, and a third limiting wall 421 is provided on the fixing rod 420. The third limiting wall 421 is used to abut against the side of the fixing column 455 away from the slider 440 to limit the movement of the fixing column 455 relative to the fixing rod 420 in a direction opposite to the insertion direction.

[0082] Specifically, the fixing rod 420 is used to drive the fixing block 430 to slide into the installation channel, and the third limiting wall 421 abuts against the side of the fixing column 455 away from the slider 440, which can limit the fixing column 455 from moving relative to the fixing rod 420 in the direction opposite to the plugging direction, so that the second abutting wall 410 can stably abut against the second limiting wall 322 of the innermost plug block 310. In addition, when the fixing rod 420 drives the slider 440 to move relative to the support platform 451, the fixing block 430 can be stably maintained at the current position, so that the two support platforms 451 are spread apart on the side close to the slider 440.

[0083] Furthermore, the slider 440 has a guide end 441 on the side away from the fixing column 455. In the process of inserting the fixing component 400 into the installation channel, the fixing rod 420 drives the slider 440 and the support block 450 to move, and the guide end 441 of the slider 440 is inserted into the installation groove of the innermost plug block 310, and under the action of external force, the fixing rod 420 is pushed to make the fixing block 430 move relative to the plug block 310, so that the two innermost support bodies 320 are separated, and the fixing block 430 is accommodated in the installation channel.

[0084] Furthermore, guide protrusions 431 are respectively provided on both sides of the support block 450, and the side of the guide protrusion 431 close to the guide end 441 is configured as a second limiting wall 322. The guide protrusion 431 is used to be inserted into the groove 324 of the innermost insertion block 310, thereby playing a guiding role to stably open the two innermost support bodies 320.

[0085] Furthermore, a connection end 426 is provided at one end of the fixed rod 420 away from the slider 440, and the blocking block 460 is used to be sleeved on the connection end 426 to stably connect with the fixed rod 420. At the same time, the blocking block 460 will not interfere with the fixed rod 420 during the process of rotating relative to the fixed rod 420. In addition, an operating end 423 is also provided on the blocking block 460, so that it is convenient to cooperate with common tools such as a wrench to drive the blocking block 460 to rotate.

[0086] See also Fig.10 and Fig.11In one embodiment, a first deformation groove 453 is provided on the inner side of the end of each support platform 451 connected to the fixing column 455, so that the two support platforms 451 can be bent by the thrust of the slider 440, so that the two support platforms 451 can be easily opened.

[0087] See also Fig.10 and Fig.11 In one embodiment, a second deformation groove 454 is provided on the outer side of the end of each support platform 451 connected to the fixing column 455, so that the two support platforms 451 are conveniently bent under the thrust of the slider 440, so that the two support platforms 451 can be easily opened.

[0088] See also Figure 1 , Figure 2 and Fig. 9 , an embodiment of the present invention further provides a medical device, including the above-mentioned vertebral distraction device. In the present application, a support assembly 300 is inserted between the two support plates 210 of the distraction assembly 200, and a fixing assembly 400 is inserted into the mounting channel in the support assembly 300 to distract the two support plates 210. That is, compared with the prior art, the present application converts the hollow distraction assembly 200 into a solid one, thereby improving the stability of the distraction assembly 200, thereby avoiding the use of bone cement to increase the stability of the distraction assembly 200, thereby avoiding the leakage of bone cement during the injection process, and improving the reliability of the medical device.

[0089] See also Figure 2 , Figure 3 , Figure 6 and Figure 7 The embodiment of the present invention further provides a vertebral distraction method, which uses the above-mentioned vertebral distraction device to perform vertebral distraction, and the method includes:

[0090] S10, according to the height to be expanded of the expanded end surface, the number of the inserting blocks 310 to be inserted between the two support plates 210 of the expansion assembly 200 is determined;

[0091] S20: insert the pedicle screw 100 into a preset position, and insert the support assembly 300 between the two support plates 210;

[0092] S30: insert the fixing assembly 400 into the installation channel to relatively open the two support plates 210 to a preset height.

[0093] See also Figure 2 , Figure 3 , Figure 6 and Figure 7 In one embodiment, in S20, the method specifically includes:

[0094] When there is only one insert block 310, the insert block 310 is inserted between the two support plates 210, and the fixing assembly 400 is inserted into the mounting groove of the insert block 310 and force is applied to the two support bodies 320, so that the connection between the two support bodies 320 is disconnected and the two support bodies 320 are radially moved outward along the two sides of the pedicle screw 100, so as to open the two support plates 210;

[0095] When there are at least two insert blocks 310, each insert block 310 is inserted and matched in sequence, and the two support bodies 320 of each insert block 310 are separated. All the support bodies 320 are stacked in sequence from the inside to the outside along the radial sides of the pedicle screw 100. The fixing assembly 400 is inserted into the installation groove of the innermost insert block 310 and applies force to the two support bodies 320 to disconnect the connection between the two support bodies 320 and move radially outward along the two sides of the pedicle screw 100 to open the two support plates 210.

[0096] When the inserting block 310 is inserted and matched, the inserting block 310 to be inserted is inserted into the installation groove of the inserted inserting block 310 to separate the two supporting bodies 320 of the inserted inserting block 310.

[0097] See also Figure 6 , Fig. 9 and Fig.10 In one embodiment, in S30, the method specifically includes:

[0098] The fixing assembly 400 includes a fixing rod 420 and a fixing block 430. The fixing block 430 is located in the installation channel. The fixing block 430 includes a slider 440 and a support block 450 that penetrates the fixing rod 420. The support block 450 includes a fixing column 455 and two oppositely arranged support platforms 451. One side of the two support platforms 451 is connected to the fixing column 455, and the other side is surrounded by a support groove 452. In the step of inserting the fixing assembly 400 into the installation channel to relatively open the two support plates 210 to a preset height, the method further includes:

[0099] The fixing block 430 is driven to move by the fixing rod 420 so that the fixing block 430 is accommodated in the installation channel;

[0100] The fixing rod 420 is controlled to rotate around the axis of the pedicle screw 100 to move the slider 440 toward the support platform 451 to spread the two support platforms 451 away from the side of the fixing column 455 to adjust the spread angle of the two support plates 210 .

[0101] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A vertebral distraction device, characterized in that: The vertebral body distraction device comprises: A pedicle screw (100) and a distraction assembly (200) connected to the pedicle screw (100) along the axial direction, wherein the distraction assembly (200) comprises two support plates (210), and the two support plates (210) are arranged at intervals along the radial direction of the pedicle screw (100); A support assembly (300), wherein a mounting channel is provided in the support assembly (300), and the support assembly (300) is used to be inserted between the two support plates (210) to spread and support the two support plates (210); A fixing assembly (400) is used to be inserted into the installation channel to expand and support the supporting assembly (300).

2. The vertebral distraction device according to claim 1, characterized in that: The support assembly (300) comprises at least one plug-in block (310), the plug-in block (310) comprises two supporting bodies (320) arranged opposite to each other, the two supporting bodies (320) are connected to each other, and a mounting groove is arranged between the two supporting bodies (320); wherein: When the support assembly (300) includes an insert block (310), the installation slot of the insert block (310) is configured as the installation channel, and the fixing assembly (400) is inserted into the installation slot to prop apart the two support plates (210); When the support assembly (300) includes more than one plug block (310), each of the plug blocks (310) is inserted and matched in sequence, and the two support bodies (320) of each of the plug blocks (310) are separated. All of the support bodies (320) are stacked in sequence radially from the inside to the outside along both sides of the pedicle screw (100), and the installation groove of the innermost plug block (310) is configured to form the installation channel. The fixing assembly (400) is inserted into the installation groove to open the two support plates (210).

3. The vertebral distraction device according to claim 2, characterized in that: One end of the insert block (310) is provided with an introduction end (340), and the other end is provided with a guide groove (330), the guide groove (330) is located between the two support bodies (320) of the insert block (310), and the guide groove (330) is configured to be at least part of the installation groove; In any two adjacent plug-in blocks (310) that are plug-fitted, the guide groove (330) of the plug-in block (310) located on the outside is used for the insertion of the introduction end (340) of the plug-in block (310) located on the inside.

4. The vertebral distraction device according to claim 2, characterized in that: The outer sides of the two support bodies (320) of the plug block (310) are provided with protrusions (323) extending along the plugging direction, and the inner sides of the two support bodies (320) are provided with grooves (324) corresponding to the protrusions (323); In any two adjacent plug-in blocks (310) that are plug-fitted, the protrusion (323) of the plug-in block (310) located on the inner side is slidably guided in cooperation with the groove (324) of the plug-in block (310) located on the outer side.

5. The vertebral distraction device according to claim 2, characterized in that: A first limiting wall (321) is provided on the outer side of each support body (320), and a second limiting wall (322) corresponding to the first limiting wall (321) is provided on the inner side. In any two adjacent plug-in blocks (310) that are plug-in matched, the first limiting wall (321) of the support body (320) located on the inner side abuts against the second limiting wall (322) of the support body (320) located on the outer side, so as to limit the movement of the support body (320) located on the inner side relative to the support body (320) located on the outer side along the plug-in direction of the plug-in block (310).

6. The vertebral distraction device according to claim 5, characterized in that: A first abutting wall (211) is provided on one side opposite to the two support plates (210), and the first abutting wall (211) is used to abut against the first limiting wall (321) on the support body (320) of the outermost plug block (310) to limit the movement of the support body (320) relative to the expansion assembly (200) along the plugging direction.

7. The vertebral distraction device according to claim 5, characterized in that: The fixing assembly (400) is provided with a limiting portion and two second abutting walls (410); the fixing assembly (400) is inserted into the pedicle screw (100); the limiting portion is used for limiting cooperation with the pedicle screw (100); the second abutting wall (410) is used for abutting against the second limiting wall (322) on the supporting body (320) of the innermost plug block (310) to limit the movement of the supporting body (320) relative to the expansion assembly (200) in a direction opposite to the plug-in direction.

8. The vertebral distraction device according to claim 7, characterized in that: The pedicle screw (100) is provided with a through hole (110) for accommodating the fixing assembly (400), and an internal thread (120) is provided on the hole wall of the through hole (110) at one end away from the expansion assembly (200). The fixing assembly (400) further comprises a blocking block (460), and the blocking block (460) is used for being threadedly connected to the hole wall of the through hole (110), and the thread on the outer wall of the blocking block (460) forms the limiting portion.

9. The vertebral distraction device according to any one of claims 1 to 8, characterized in that: The fixing assembly (400) comprises a fixing rod (420) and a fixing block (430), wherein the fixing block (430) is located in the installation channel, and the fixing block (430) comprises a sliding block (440) and a supporting block (450) which penetrates the fixing rod (420), and the supporting block (450) comprises a fixing column (455) and two supporting platforms (451) which are arranged opposite to each other, wherein one side of the two supporting platforms (451) is connected to the fixing column (455), and the other side is surrounded by a supporting groove (452); The slider (440) is at least partially accommodated in the expansion groove (452), and the fixing rod (420) is threadedly connected to the slider (440). The fixing rod (420) is configured to drive the slider (440) to move toward the support platform (451) when rotating around the axis of the pedicle screw (100), so as to expand the two support platforms (451) away from one side of the fixing column (455) to adjust the expansion angle of the two support plates (210).

10. The vertebral distraction device according to any one of claims 1 to 8, characterized in that: The expansion assembly (200) further comprises a connecting seat (230) and a plurality of connecting arms (220), wherein the connecting seat (230) is located on a side of the support plate (210) away from the pedicle screw (100), one end of each support plate (210) is connected to the pedicle screw (100) via at least one connecting arm (220), and the other end is connected to the connecting seat (230) via at least one connecting arm (220), and the connecting arm (220) is used to support the corresponding support plate (210) when the two support plates (210) are relatively expanded.

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