Vertebral body distraction device

Abstract

The present application relates to a kind of vertebral body distraction device.The device includes pedicle screw, support component, fixed component and the distraction component connected with pedicle screw along the axial direction;Distraction component includes two support plates, two support plates are spaced apart along the radial direction of pedicle screw;Support component is provided with installation channel, support component is used to be inserted between two support plates, to open and support two support plates;Fixed component is used to be inserted in installation channel, to open and support support component.By inserting support component between two support plates, fixed component is inserted in installation channel, to open two support plates, i.e., the hollow distraction component is converted to solid in the present application, improve the stability of distraction component, so as to avoid using bone cement to increase the stability of distraction component, and then avoid the leakage problem caused by bone cement in injection process, improve the reliability of vertebral body distraction device.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a vertebral body dispersing device. Background Technology

[0002] When a vertebra suffers a compression fracture due to trauma, especially when accompanied by osteoporosis, the usual treatment involves: first, establishing a minimally invasive channel via pedicle screws; then, using specialized instruments to restore the original height of the vertebra; and finally, injecting bone cement into the vertebra through the minimally invasive channel for fixation. Current techniques often involve erecting a support frame to partially restore the height of the affected vertebra, followed by injecting bone cement into the hollow support frame to stabilize the fractured vertebra. However, the flowing bone cement can cause leakage during injection, potentially leading to changes in the vertebra's biomechanical state, accelerated degeneration, and fractures of adjacent vertebrae or even refracture. Summary of the Invention

[0003] Therefore, it is necessary to provide a vertebral body opening device to address the technical problems in existing technologies, which often involve erecting a support to open the opening component to partially restore the height of the affected vertebra, and then injecting bone cement into the hollow opening component to stabilize the fractured vertebra. However, the flowing bone cement can cause leakage and other problems during the injection process, which can lead to changes in the biomechanical state of the vertebra, accelerated degeneration, and fractures or refractures of adjacent vertebrae.

[0004] A vertebral body spreading device, comprising:

[0005] The pedicle screw and the axially connected expansion assembly to the pedicle screw, the expansion assembly including two support plates, the two support plates being arranged radially spaced along the pedicle screw;

[0006] A support assembly having an installation channel is provided therein, and the support assembly is used to be inserted between two support plates to open and support the two support plates;

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

[0008] In one embodiment, the support assembly includes at least one insert block, the insert block comprising two opposing support bodies connected to each other, and a mounting groove provided between the two support bodies; wherein:

[0009] When the support assembly includes a plug, the mounting slot of the plug forms the mounting channel, and the fixing assembly is inserted into the mounting slot to open the two support plates.

[0010] When the support assembly includes more than one insert, each insert is inserted and engaged in sequence, the two supports of each insert are separated, and all the supports are stacked radially from the inside to the outside along both sides of the pedicle screw. The mounting groove of the innermost insert forms the mounting channel, and the fixing assembly is inserted into the mounting groove to open the two support plates.

[0011] In one embodiment, one end of the insert block is provided with an inlet end and the other end is provided with a guide groove, the guide groove being located between the two supports of the insert block, and the guide groove being configured to at least partially form the mounting groove;

[0012] In any two adjacent plugs that are in a plug-in fit, the guide groove of the plug located on the outer side is used for the insertion end of the plug located on the inner side to be inserted.

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

[0014] In any two adjacent inserts in the interlocking arrangement, the protrusion of the inner insert slides and guides the groove of the outer insert in a sliding engagement.

[0015] In one embodiment, each of the supports has a first limiting wall on its outer side and a second limiting wall corresponding to the first limiting wall on its inner side. In any two adjacent plugs that are inserted and mated, the first limiting wall of the inner support abuts against the second limiting wall of the outer support to restrict the movement of the inner support relative to the outer support along the insertion direction of the plug.

[0016] In one embodiment, each of the two support plates has a first abutting wall on its opposite side. The first abutting wall abuts against the first limiting wall on the support body of the outermost insert block to restrict the movement of the support body relative to the spreading assembly along the insertion direction.

[0017] In one embodiment, the fixing component is provided with a limiting portion and two second abutting walls. The fixing component passes through the pedicle screw. The limiting portion is used to limit the engagement with the pedicle screw. The second abutting walls are used to abut against the second limiting wall on the support body of the innermost insertion block to restrict the movement of the support body relative to the spreading component in a direction opposite to the insertion direction.

[0018] In one embodiment, the pedicle screw has a through hole for receiving the fixation component. The wall of the through hole at the end away from the spreading component has an internal thread. The fixation component also includes a sealing block for threaded connection to the wall of the through hole. The thread on the outer wall of the sealing block forms the limiting portion.

[0019] In one embodiment, the fixing component 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 pass through the fixing rod. The support block includes a fixing post and two oppositely arranged support platforms. One side of each of the two support platforms is connected to the fixing post, and the other side is surrounded by a support groove.

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

[0021] In one embodiment, the spreading assembly further includes a connecting seat and a plurality of connecting arms. The connecting seat is located on the side of the support plate away from the pedicle screw. One end of each support plate is connected to the pedicle screw through at least one of the connecting arms, and the other end is connected to the connecting seat through at least one of the connecting arms. The connecting arms are used to support the corresponding support plate when the two support plates are spread apart relative to each other.

[0022] Beneficial effects:

[0023] The vertebral body expansion device provided in this invention includes a pedicle screw, a support assembly, a fixation assembly, and an expansion assembly connected axially to the pedicle screw. The expansion assembly includes two support plates, which are radially spaced along the pedicle screw. An installation channel is provided within the support assembly, which is inserted between the two support plates to expand and support them. The fixation assembly is inserted into the installation channel to expand and support the support assembly. In this application, by inserting the support assembly between the two support plates of the expansion assembly and inserting the fixation assembly into the installation channel within the support assembly to expand the two support plates, the hollow expansion assembly is transformed into a solid one compared to the prior art. This improves the stability of the expansion assembly, thereby avoiding the use of bone cement to increase its stability and preventing leakage problems during injection, thus improving the reliability of the vertebral body expansion device. Attached Figure Description

[0024] Figure 1 A schematic diagram of a vertebral body spreading device provided in an embodiment of the present invention. Figure 1 .

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

[0026] Figure 3 This is a schematic diagram of the insert block in a vertebral body spreading device provided in an embodiment of the present invention.

[0027] Figure 4 This is a cross-sectional view of the insert block in a vertebral body spreading device provided in an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the pedicle screw and the expansion assembly in a vertebral body expansion device provided in an embodiment of the present invention.

[0029] Figure 6 This is a cross-sectional view of the pedicle screw and the expansion assembly in a vertebral body expansion device provided in an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the fixing component in a vertebral body spreading device provided in an embodiment of the present invention.

[0031] Figure 8 This is a cross-sectional view of the fixation component in a vertebral body spreading device provided in an embodiment of the present invention.

[0032] Figure 9 A schematic diagram of a vertebral body spreading device provided in an embodiment of the present invention. Figure 2 .

[0033] Figure 10 This is a schematic diagram of the fixing component in a vertebral body spreading device provided in another embodiment of the present invention.

[0034] Figure 11 This is a schematic diagram of the fixing block in a vertebral body spreading device provided in another embodiment of the present invention.

[0035] Figure 12 This is a schematic diagram of the fixing rod in a vertebral body spreading device provided in another embodiment of the present invention.

[0036] Icon labels:

[0037] 100-Pedicle screw; 110-Through hole; 120-Internal thread; 200-Spreading assembly; 210-Support plate; 211-First abutment 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-Inlet end; 350-First weak connection structure; 360 - Second weak connection structure; 400 - Fixing component; 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 platform; 452 - Spreading groove; 453 - First deformation groove; 454 - Second deformation groove; 455 - Fixing column; 460 - Sealing block. Detailed Implementation

[0038] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] See Figure 1 , Figure 1 A schematic diagram of a vertebral body spreading device provided in an embodiment of the present invention. Figure 1 An embodiment of the present invention provides a vertebral body expansion device, including a pedicle screw 100, a support assembly 300, a fixation assembly 400, and an expansion assembly 200 connected axially to the pedicle screw; the expansion assembly 200 includes two support plates 210, which are arranged radially spaced along the pedicle screw 100; the support assembly 300 has an installation channel and is used to be inserted between the two support plates 210 to expand and support the two support plates 210; the fixation assembly 400 is used to be inserted into the installation channel to expand and support the support assembly 300.

[0045] Specifically, in this application, a support component 300 is inserted between the two support plates 210 of the expansion component 200, and a fixing component 400 is inserted in the installation channel within the support component 300 to expand the two support plates 210. That is, compared with the prior art, this application transforms the hollow expansion component 200 into a solid one, which improves the stability of the expansion component 200. This avoids the need to use bone cement to increase the stability of the expansion component 200, thereby avoiding problems such as leakage caused by bone cement during injection and improving the reliability of the vertebral body expansion device.

[0046] The opening height between the two support plates 210 can be adjusted by adjusting the support component 300 inserted between the two support plates 210, thereby supporting the cone to a preset height.

[0047] See Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of an insert block in a vertebral body expansion device according to an embodiment of the present invention. In one embodiment, the support assembly 300 includes at least one insert block 310, and the insert block 310 includes two opposing support bodies 320 connected to each other, with a mounting groove provided between the two support bodies 320; wherein:

[0048] When the support assembly 300 includes a plug 310, the mounting groove of the plug 310 is configured as a mounting channel. The fixing assembly 400 is inserted into the mounting groove and applies force to the two supports 320 so that the connection between the two supports 320 is broken and moves radially outward along both sides of the pedicle screw 100 to open the two support plates 210.

[0049] When the support assembly 300 includes more than one insert 310, each insert 310 is inserted and engaged in sequence, and the two supports 320 of each insert 310 are separated. All supports 320 are stacked in sequence from the inside to the outside along both sides of the pedicle screw 100. The mounting groove of the innermost insert 310 forms an installation channel. The fixing assembly 400 is inserted into the mounting groove and applies force to the two supports 320 so that the connection between the two supports 320 is broken and they move outward along both sides of the pedicle screw 100 to open the two support plates 210.

[0050] Specifically, the insert 310 has an initial state and a deformed state. When the insert 310 is in the initial state, the two supports 320 in the insert 310 are connected to each other, and an installation groove is provided between the two supports 320. When the height of the support assembly 300 is determined, that is, when the number of inserts 310 inserted into the spreading assembly 200 is determined, when there is only one insert 310, the insert 310 is inserted between the two support plates 210, and then the fixing assembly 400 is inserted into the installation 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 spread the two support plates 210 apart, so that the insert 310 is transformed into a deformed state, so that the two support plates 210 are spread apart to a preset height.

[0051] When there is more than one insert 310, one of the insert 310 in the initial state is inserted between the two support plates 210, and the remaining insert 310 in the initial state are sequentially inserted between the two support bodies 320 of the previous insert 310 that has been inserted. That is, the insert 310 to be inserted is inserted into the mounting groove of the insert 310 to separate the two support bodies 320 of the insert 310 to be inserted, so that each insert 310 is stacked sequentially from the inside to the outside along the radial direction of the pedicle screw 100 between the two support plates 210. Finally, the fixing component 400 is inserted into the mounting groove of the innermost insert 310, thereby opening the two support plates 210 relative to each other to a preset height.

[0052] In this application, by controlling the number of insert blocks 310 inserted into the spreading assembly 200, the spreading height of the two support plates 210 in the spreading assembly 200 is adjusted, thereby facilitating the precise design of the spreading end face height and improving the spreading accuracy of the vertebral body spreading device. Each support plate 210 is located on the side opposite to the fixing assembly 400, and is used to support the vertebral body, forming the spreading end face.

[0053] Furthermore, the extended end face can be either curved or flat. The support plate 210 also has a porous fusion layer 240 on the side opposite to the fixing component 400, thereby facilitating the growth of the vertebral body.

[0054] See Figure 1 , Figure 2 and Figure 3 In one embodiment, one end of the plug 310 is provided with an inlet end 340 and the other end is provided with a guide groove 330. The guide groove 330 is located between the two supports 320 of the plug 310 and is configured as at least a partial mounting groove. In any two adjacent plugs 310 that are plugged in, the guide groove 330 of the plug 310 located on the outer side is used for the inlet end 340 of the plug 310 located on the inner side to be inserted.

[0055] Specifically, when the fixing component 400 is not inserted, in the plug-in block 310, the two supports 320 of the innermost plug-in block 310 have not yet separated, that is, there is an installation groove between the two supports 320. When the plug-in block 310 in the initial state is inserted between the two supports 320 of the previous plug-in block 310 that has been inserted, the plug-in block 310 in the initial state is inserted into the installation groove through the inlet end 340, and under the action of external force, the plug-in block 310 in the initial state moves relative to the previous plug-in block 310 that has been inserted, thereby facilitating the separation of the two supports 320 of the innermost plug-in block 310, realizing the plug-in fit, and increasing the distance between the two support plates 210.

[0056] Furthermore, the inlet 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 supports 320. The insert 310 also includes a first weak connection structure 350 and a second weak connection structure 360. The two supports 320 are connected on the side near the inlet end 340 through the first weak connection structure 350, and the two supports 320 are connected on the side near the mounting groove through the second weak connection structure 360. In the insert 310 that are in the insertion engagement, when the innermost insert 310 moves relative to its adjacent insert 310, the innermost insert 310 can break through the first weak connection structure 350 and the second weak connection structure 360 ​​of the corresponding insert 310, thereby making it easy for the two supports 320 to separate.

[0058] It should be noted that, in the initial state, the gap between the two supports 320 and the guide groove 330 together form a mounting groove in a single insert 310. 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 Figure 2 , Figure 3 and Figure 4 , Figure 4 This is a cross-sectional view of the insert block in a vertebral body spreading device according to an embodiment of the present invention. In one embodiment, the outer sides of the two supports 320 of the insert block 310 are provided with protrusions 323 extending along the insertion direction, and the inner sides of the two supports 320 are provided with grooves 324 corresponding to the protrusions 323; in any two adjacent insert blocks 310 that are inserted together, the protrusion 323 of the inner insert block 310 is used for sliding guide engagement with the groove 324 of the outer insert block 310.

[0060] Specifically, each insert 310 has a protrusion 323 extending along the insertion direction on its outer side and a groove 324 corresponding to the protrusion 323 on its inner side. This arrangement guides the insert 310 in its initial state when it is inserted between the two supports 320 of the previous insert 310, thereby allowing all supports 320 to be stacked sequentially from the inside to the outside along the radial direction of the pedicle screw 100 between the two support plates 210, thus stably supporting the two support plates 210. Preferably, the protrusion 323 is located at the center of the insert 310.

[0061] See Figure 2 , Figure 3 and Figure 4 In one embodiment, each support 320 has a first limiting wall 321 on its outer side and a second limiting wall 322 corresponding to the first limiting wall 321 on its inner side. In any two adjacent plugs 310 that are inserted and mated, the first limiting wall 321 of the inner support 320 abuts against the second limiting wall 322 of the outer support 320 to restrict the movement of the inner support 320 relative to the outer support 320 along the insertion direction of the plug 310.

[0062] Specifically, on each support 320, the side of the protrusion 323 near the inlet end 340 is configured as a first limiting wall 321, and the side of the groove 324 near the inlet end 340 is configured as a second limiting wall 322. In any two adjacent inserts 310 that are engaged, the second limiting wall 322 in the outer insert 310 abuts against the first limiting wall 321 in the inner insert 310, thereby restricting the movement of the inner support 320 relative to the outer support 320 along the insertion direction of the insert 310, and also restricting the movement of the outer support 320 relative to the inner support 320 in a direction opposite to the insertion direction of the insert 310, thereby ensuring that each insert 310 is stably inserted into the spreading assembly 200, improving the stability of the cone spreading device.

[0063] Figures 2-6 , Figure 5 This is a schematic diagram of the pedicle screw and the expansion assembly in a vertebral body expansion device provided in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the pedicle screw and the spreading component in a vertebral body spreading device according to an embodiment of the present invention. In one embodiment, each of the two support plates 210 has a first abutment wall 211 on its opposite side. The first abutment wall 211 is used to abut against a first limiting wall 321 on the support body 320 of the outermost insertion block 310 to restrict the movement of the support body 320 relative to the spreading component 200 in the insertion direction.

[0064] Specifically, in the plug-in engagement of the plug 310, the outermost first limiting wall 321 abuts against the first abutting wall 211, thereby restricting the movement of the outermost plug 310 relative to the spreading assembly 200. In any two adjacent plugs 310 in the plug-in engagement, the outer plug 310 can restrict the movement of the inner plug 310 along the insertion direction of the plug 310, thereby restricting the movement of each plug 310 along the insertion direction of the plug 310, so that each plug 310 is stably inserted into the spreading assembly 200, improving the stability of the vertebral spreading device.

[0065] See Figures 2-4 and Figures 7-8 , Figure 7 This is a schematic diagram of the fixing component in a vertebral body spreading device according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of the fixation component in a vertebral body expansion device according to an embodiment of the present invention. In one embodiment, the fixation component 400 is provided with a limiting part and two second abutment walls 410. The fixation component 400 passes through the pedicle screw 100. The limiting part is used to limit the engagement with the pedicle screw 100. The second abutment walls 410 are used to abut against the second limiting wall 322 on the support body 320 of the innermost insertion block 310 to restrict the support body 320 from moving relative to the expansion component 200 in a direction opposite to the insertion direction.

[0066] Specifically, since the limiting part cooperates with the pedicle screw 100, the relative position of the fixation component 400 and the pedicle screw 100 can be limited. In the insert block 310 with the insertion engagement, the innermost second limiting wall 322 abuts against the second abutment wall 410, thereby limiting the movement of the innermost insert block 310 relative to the spreading component 200. In any two adjacent insert blocks 310 with the insertion engagement, the inner insert block 310 can limit the movement of the outer insert block 310 in the opposite direction to the insertion direction of the insert block 310, thereby limiting the movement of each insert block 310 in the opposite direction to the insertion direction of the insert block 310, so that each insert block 310 is stably inserted into the spreading component 200, improving the stability of the vertebral body spreading device.

[0067] It should be noted that the inserts 310 located in the expansion assembly 200 are inserted sequentially. Therefore, the first abutment wall 211 and the second limiting wall 322 will not interfere with the insertion of the insert 310 in the initial state between the two supports 320 of the previous insert 310 that has been inserted.

[0068] See Figure 6 , Figure 7 and Figure 8In one embodiment, the pedicle screw 100 is provided with a through hole 110 for accommodating the fixation component 400. The wall of the through hole 110 away from the supporting component 200 is provided with an internal thread 120. The fixation component 400 also includes a sealing block 460, which is threaded to the wall of the through hole 110. The thread on the outer wall of the sealing block 460 forms a limiting part.

[0069] Specifically, by threading the sealing block 460 to the wall of the through hole 110, the fixing component 400 is stably connected to the pedicle screw 100, which also facilitates the installation of the fixing component 400 relative to the pedicle screw 100, thus improving the installation efficiency of the vertebral body relaxation device.

[0070] See Figure 1 , Figure 2 , Figure 5 and Figure 6 In one embodiment, the spreading assembly 200 further includes a connecting seat 230 and a plurality of connecting arms 220. The connecting seat 230 is located on the 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 spread apart relative to each other.

[0071] Specifically, the connecting arm 220 ensures that the two support plates 210 maintain a stable connection with the pedicle screw 100 during the relative spreading process, thereby improving the stability of the vertebral support device. Furthermore, the connecting arm 220 increases the number of support points for the support plates 210, resulting in superior support performance and improved reliability of the vertebral spreading device.

[0072] See Figure 1 , Figure 2 and Figure 6 In one embodiment, each connecting arm 220 has a third deformation groove 221 at its end near the corresponding support plate 210. The opening of the third deformation groove 221 faces the side of the fixing assembly 400, so that each connecting arm 220 near the end of the corresponding support plate 210 can rotate towards the side of the support plate 210 under the drive of the corresponding support plate 210, thereby facilitating the support of the corresponding support plate 210.

[0073] See Figure 1 , Figure 2 and Figure 6In one embodiment, each connecting arm 220 has a fourth deformation groove 222 at the end away from the corresponding support plate 210. The opening of the fourth deformation groove 222 faces the side away from the fixing component 400, so that the end of each connecting arm 220 away from the corresponding support plate 210 can rotate to the side away from the support plate 210 under the drive of the corresponding support plate 210, thereby facilitating the support of the corresponding support plate 210.

[0074] In this application, each support plate 210 has a supporting force at both ends 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 arms 220, the deformation point of each connecting arm 220 can be controlled, avoiding the deviation of the deformation point from causing structural deformity and improving the reliability of the vertebral body opening device.

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

[0076] See Figures 9-12 , Figure 9 A schematic diagram of a vertebral body spreading device provided in an embodiment of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of the fixing component in a vertebral body spreading device provided in another embodiment of the present invention; Figure 11 This is a schematic diagram of a fixing block in a vertebral body spreading device provided in another embodiment of the present invention; Figure 12 This is a schematic diagram of a fixing rod in a vertebral body expansion device according to another embodiment of the present invention. In one embodiment, the fixing assembly 400 includes a fixing rod 420 and a fixing block 430. The fixing block 430 is located in the installation channel and includes a slider 440 passing through the fixing rod 420 and a support block 450. The support block 450 includes a fixing post 455 and two opposing support platforms 451. One side of each support platform 451 is connected to the fixing post 455, and the other side is surrounded by an expansion groove 452. The slider 440 is at least partially accommodated in the expansion groove 452. The fixing rod 420 is threadedly connected to the slider 440. 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, thereby expanding the side of the two support platforms 451 away from the fixing post 455 and adjusting the expansion angle of the two support plates 210.

[0077] Specifically, the second abutment wall 410 is disposed on the support block 450, the sealing 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 threaded transmission. Since the slider 440 is housed in the expansion groove 452 surrounded by the two support platforms 451, the slider 440 can apply a radial outward component force along the pedicle screw 100 to the two support platforms 451 under the drive of the fixing rod 420, thereby causing the side of the two support platforms 451 away from the fixing column 455 to be expanded, and the opening angle of the two support plates 210 away from the fixing column 455 to be greater than that of the other side, so that the two ends of the expansion end face can have different heights, thereby adapting to different support requirements of the vertebral body, that is, realizing the precise expansion and angle control of the vertebral body expansion device, and improving the expansion accuracy and adaptability of the vertebral body expansion device.

[0078] Furthermore, the expansion groove 452 is V-shaped, and the shape of the slider 440 is adapted to 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 the end of the threaded end 424 near the sealing block 460. The fourth limiting wall 427 is used to abut against the slider 440 to limit the movement of the slider 440 relative to the support platform 451, prevent the two support platforms 451 from opening at too large an angle, causing the two support platforms 451 to detach from the fixing column 455, and improve the stability of the cone-shaped opening device.

[0080] See Figure 1 , Figure 2 , Figure 7 and Figure 8 In other embodiments, if it is not necessary to adjust the opening angle of the opening end face, the fixing block 430 can be made into a single unit. In one embodiment, the sealing block 460 and the fixing rod 420 are integrally formed, and the fixing block 430 and the fixing rod 420 are interference-fitted, thereby reducing interference with the fixing block 430 when the sealing block 460 is rotated to make the sealing block 460 threadedly connected with the internal thread 120.

[0081] See Figure 7 , Figure 8 , Figure 10 and Figure 12In one embodiment, the fixing post 455 is located on the side of the support platform 451 near the pedicle screw 100, and the fixing rod 420 is provided with a third limiting wall 421. The third limiting wall 421 is used to abut against the side of the fixing post 455 away from the slider 440 to restrict the fixing post 455 from moving 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 into the installation channel, and abuts against the side of the fixing post 455 away from the slider 440 through the third limiting wall 421. This restricts the movement of the fixing post 455 relative to the fixing rod 420 in a direction opposite to the insertion direction, thereby allowing the second abutment wall 410 to stably abut against the second limiting wall 322 of the innermost insertion block 310. In addition, during the process of the fixing rod 420 driving the slider 440 to move relative to the support platform 451, the fixing block 430 can be stably maintained in its current position, causing the two support platforms 451 to open up on the side closer to the slider 440.

[0083] Furthermore, the slider 440 has a guide end 441 on the side away from the fixing post 455. During the process of inserting the fixing assembly 400 into the installation channel, the fixing rod 420 drives the slider 440 and the support block 450 to move, and causes the guide end 441 of the slider 440 to be inserted into the installation groove of the innermost insert block 310. Under the action of external force, the fixing rod 420 is pushed, causing the fixing block 430 to move relative to the insert block 310, so that the two innermost supports 320 are separated, and the fixing block 430 is accommodated in the installation channel.

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

[0085] Furthermore, the end of the fixed rod 420 furthest from the slider 440 is provided with a connecting end 426. The sealing block 460 is fitted onto the connecting end 426 to ensure a stable connection with the fixed rod 420. Simultaneously, the sealing block 460 will not interfere with the fixed rod 420 during its rotation relative to it. Additionally, the sealing block 460 is also provided with an operating end 423, facilitating the use of common tools such as wrenches to rotate the sealing block 460.

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

[0087] See Figure 10 and Figure 11 In one embodiment, each support platform 451 is provided with a second deformation groove 454 on the outer side of the end connected to the fixed column 455, so that the two support platforms 451 can be bent by the thrust of the slider 440, making the two support platforms 451 easy to open.

[0088] See Figure 1 , Figure 2 and Figure 9 This invention also provides a medical device including the aforementioned vertebral body expansion device. In this application, a support component 300 is inserted between the two support plates 210 of the expansion component 200, and a fixing component 400 is inserted into the installation channel within the support component 300 to expand the two support plates 210. Compared to the prior art, this application transforms the hollow expansion component 200 into a solid one, improving the stability of the expansion component 200. This avoids the need to use bone cement to increase the stability of the expansion component 200, thereby preventing leakage problems during injection and improving the reliability of the medical device.

[0089] See Figure 2 , Figure 3 , Figure 6 and Figure 7 This invention also provides a method for vertebral body distraction, which uses the above-mentioned vertebral body distraction device to distract the vertebral body. The method includes:

[0090] S10 determines the number of insert blocks 310 used to insert between the two support plates 210 of the expansion assembly 200 according to the height that the expansion end face needs to be expanded;

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

[0092] S30 inserts the fixing component 400 into the installation channel to spread the two support plates 210 relative to each other to a preset height.

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

[0094] When there is one insert 310, insert 310 between two support plates 210, and insert the fixing component 400 into the mounting groove of insert 310 and apply force to the two supports 320 so that the connection between the two supports 320 is broken and moves radially outward along both sides of the pedicle screw 100 to open the two support plates 210.

[0095] When there are at least two inserts 310, each insert 310 is inserted and fitted in sequence, and the two supports 320 of each insert 310 are separated. All supports 320 are stacked in sequence from the inside to the outside along both sides of the pedicle screw 100. The fixing component 400 is inserted into the mounting groove of the innermost insert 310 and applies force to the two supports 320 so that the connection between the two supports 320 is broken and moves outward along both sides of the pedicle screw 100 to open the two support plates 210.

[0096] When the insert block 310 is inserted, the insert block 310 to be inserted is inserted into the mounting slot of the insert block 310 to separate the two supports 320 of the insert block 310.

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

[0098] The fixing component 400 includes a fixing rod 420 and a fixing block 430. The fixing block 430 is located within the installation channel. The fixing block 430 includes a slider 440 passing through the fixing rod 420 and a support block 450. The support block 450 includes a fixing post 455 and two opposing support platforms 451. One side of each support platform 451 is connected to the fixing post 455, and the other side is surrounded by a spreading groove 452. In the step of inserting the fixing component 400 into the installation channel to spread the two support plates 210 relative to each other to a preset height, the method further includes:

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

[0100] The control rod 420 rotates around the axis of the pedicle screw 100 so that the slider 440 moves toward the support platform 451 to open the two support platforms 451 away from the fixed column 455, so as to adjust the opening angle of the two support plates 210.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A vertebral body distraction device, comprising: The vertebral body distraction device comprises: A pedicle screw (100) and a distraction assembly (200) connected to the pedicle screw (100) in an axial direction, the distraction assembly (200) comprising two support plates (210) arranged radially apart from each other along the pedicle screw (100); A support assembly (300) provided with a mounting channel, the support assembly (300) being used for being inserted between the two support plates (210) to distract and support the two support plates (210); A fixing assembly (400) used for being inserted into the mounting channel to distract and support the support assembly (300); The fixing assembly (400) comprises a fixing rod (420) and a fixing block (430), the fixing block (430) being located in the mounting channel, the fixing block (430) comprising a sliding block (440) and a support block (450) penetrating through the fixing rod (420), the support block (450) comprising a fixing column (455) and two oppositely arranged support platforms (451), one side of each of the two support platforms (451) being connected to the fixing column (455), and the other side being provided with a distraction groove (452); The sliding block (440) is at least partially contained in the distraction groove (452), the fixing rod (420) is threadedly connected to the sliding block (440), and the fixing rod (420) is configured to rotate around the axis of the pedicle screw (100) to drive the sliding block (440) to move towards the support platform (451) to distract the two support platforms (451) away from one side of the fixing column (455) to adjust the distraction angle of the two support plates (210).

2. The vertebral distraction device of claim 1 wherein, The support assembly (300) comprises at least one insertion block (310), the insertion block (310) comprising two oppositely arranged support bodies (320), the two support bodies (320) being connected to each other, and a mounting groove being arranged between the two support bodies (320); wherein: When the support assembly (300) comprises one insertion block (310), the mounting groove of the insertion block (310) is configured as the mounting channel, and the fixing assembly (400) is inserted into the mounting groove to distract the two support plates (210); When the support assembly (300) comprises more than one insertion block (310), each insertion block (310) is sequentially inserted and matched, the two support bodies (320) of each insertion block (310) are separated, all the support bodies (320) are sequentially stacked from inside to outside along the two sides of the pedicle screw (100), the mounting groove of the innermost insertion block (310) is configured as the mounting channel, and the fixing assembly (400) is inserted into the mounting groove to distract the two support plates (210).

3. The vertebral distraction device of claim 2 wherein, One end of the plug block (310) is provided with a guide-in end (340), and the other end is provided with a guide groove (330) located between the two support bodies (320) of the plug block (310), and the guide groove (330) is configured to at least partially form the mounting groove; In any two adjacent plug blocks (310) in plug-in cooperation, the guide groove (330) of the plug block (310) located on the outside is used for inserting the guide-in end (340) of the plug block (310) located on the inside.

4. The vertebral distraction device of claim 2 wherein, The outer side of the two support bodies (320) of the plug block (310) is provided with a protrusion (323) extending along the plug-in direction of the fixing assembly (400) and the mounting groove, and the inner side of the two support bodies (320) is provided with a groove (324) corresponding to the protrusion (323); In any two adjacent plug blocks (310) in plug-in cooperation, the protrusion (323) of the plug block (310) located on the inside is in sliding guide cooperation with the groove (324) of the plug block (310) located on the outside.

5. The vertebral distraction device of claim 2 wherein, The outer side of each support body (320) is provided with a first limiting wall (321), and the inner side is provided with a second limiting wall (322) corresponding to the first limiting wall (321), and in any two adjacent plug blocks (310) in plug-in cooperation, the first limiting wall (321) of the support body (320) located on the inside abuts against the second limiting wall (322) of the support body (320) located on the outside, so as to limit 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 block (310).

6. The vertebral distraction device of claim 5 wherein, The opposite side of the two support plates (210) is provided with a first abutting wall (211), which is used for abutting against the first limiting wall (321) on the support body (320) of the plug block (310) located on the outermost side, so as to limit the movement of the support body (320) relative to the distraction assembly (200) along the plug-in direction.

7. The vertebral distraction device of claim 5 wherein, The fixing assembly (400) is provided with a limiting portion and two second abutting walls (410), the fixing assembly (400) is provided in the pedicle screw (100), the limiting portion is used for limiting cooperation with the pedicle screw (100), and the second abutting wall (410) is used for abutting against the second limiting wall (322) on the support body (320) of the plug block (310) located on the innermost side, so as to limit the movement of the support body (320) relative to the distraction assembly (200) along the direction opposite to the plug-in direction.

8. The vertebral distraction device of claim 7 wherein, The pedicle screw (100) is internally provided with a through hole (110) for accommodating the fixing assembly (400), an inner thread (120) is arranged on the hole wall of the end of the through hole (110) away from the distraction assembly (200), the fixing assembly (400) further comprises a blocking block (460), 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 of claims 1-8, wherein, The distraction assembly (200) further comprises a connecting seat (230) and a plurality of connecting arms (220), the connecting seat (230) is located on the side of the support plate (210) away from the pedicle screw (100), one end of each of the support plates (210) is connected with the pedicle screw (100) through at least one of the connecting arms (220), the other end is connected with the connecting seat (230) through at least one of the connecting arms (220), and the connecting arm (220) is used for supporting the corresponding support plate (210) when the two support plates (210) are relatively distracted.

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