Vertebral body distraction device and vertebral body distraction operating device

Abstract

The application provides a vertebral body distraction device and a vertebral body distraction operation device, which comprise a driving member, two threaded sleeves and a distraction assembly; the driving member comprises a first driving rod and a second driving rod which are detachably connected, and the first driving rod and the second driving rod are both provided with threads, and the threads on the first driving rod and the second driving rod are different in rotation direction; the two threaded sleeves are respectively sleeved on the first driving rod and the second driving rod and are matched with the threads; the two ends of the distraction assembly are respectively connected with the two threaded sleeves; when the driving member is configured to rotate around its own axis, the first driving rod and the second driving rod rotate synchronously and respectively drive the two threaded sleeves to move away from each other, so that the distraction assembly is distracted relative to the driving member. When the first driving rod and the second driving rod rotate, the corresponding threaded sleeves can be moved through the threads, and the distraction height of the distraction assembly can be determined by controlling the rotation number of the threaded sleeves relative to the threads, so that the precise distraction of the vertebral body distraction device is realized.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a vertebral body relaxation device and a vertebral body relaxation operation 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 inserting an undeployed balloon into the affected vertebra and injecting contrast agent to inflate the balloon, partially restoring the vertebra's height. The balloon is then removed, and bone cement is injected to stabilize the vertebra. However, this method is not ideal in terms of height restoration and cannot accurately control the restored height. Summary of the Invention

[0003] Therefore, it is necessary to provide a vertebral body relaxation device to address the technical problems of unsatisfactory height recovery effect and inability to accurately control the recovery height of existing specialized instruments.

[0004] A vertebral body spreading device, comprising:

[0005] The driving component includes a first driving rod and a second driving rod that are detachably connected. Both the first driving rod and the second driving rod are provided with threads, and the threads on the first driving rod and the second driving rod have different directions of rotation.

[0006] Two threaded sleeves are respectively fitted onto the first drive rod and the second drive rod, and respectively mate with the corresponding threads; and,

[0007] A spreading component is fitted onto the drive member and each of the threaded sleeves, and both ends of the spreading component are respectively connected to the two threaded sleeves;

[0008] When the drive member is configured to rotate about its own axis, the first drive rod and the second drive rod rotate synchronously and respectively drive the two threaded sleeves to move away from each other, so that the spreading assembly spreads out relative to the drive member.

[0009] In one embodiment, the threads of the first drive rod and the second drive rod have different pitches, so that the two ends of the spreading assembly are angled apart relative to the drive member.

[0010] In one embodiment, one of the first drive rods and the second drive rod has a groove at one end and a protrusion at the other end, the protrusion being connected to the groove by a thread or a snap-fit ​​connection.

[0011] In one embodiment, the spreading assembly further includes a support member and two sets of support arms. The support member is located on one side of the drive member in the radial direction. One end of each set of support arms is connected to one of the two threaded sleeves, and the other end is connected to both ends of the support member.

[0012] When the two threaded sleeves move away from each other, the ends of the two sets of support arms away from the corresponding threaded sleeves move away from the drive member, thereby causing the support member to move away from the drive member, so that the spreading assembly spreads away from the drive member.

[0013] In one embodiment, the support member includes at least one support plate, each support plate being arranged circumferentially around the drive member, each set of support arms including at least two spreading rods arranged circumferentially around the drive member and connected to a threaded sleeve, and one end of each support plate being supported by at least two spreading rods in a set of support arms.

[0014] In one embodiment, each of the supporting rods has a first deformation groove at the end connected to the support plate, the opening of the first deformation groove facing the driving member; and / or, each of the supporting rods has a second deformation groove at the end connected to the threaded sleeve, the opening of the second deformation groove facing the side away from the driving member.

[0015] In one embodiment, the vertebral body spreading device further includes two connecting seats and at least two connecting arms. The two connecting seats are respectively sleeved on the relatively far ends of the first drive rod and the second drive rod. Both ends of the support member are connected to a connecting seat through a connecting arm. Each connecting arm is used to support the corresponding support member when the support member is spread relative to the drive member.

[0016] In one embodiment, each of the connecting arms has a third deformation groove at its end connected to the support plate, with the opening of the third deformation groove facing the drive member; and / or, each of the connecting arms has a fourth deformation groove at its end connected to the connecting seat, with the opening of the fourth deformation groove facing away from the drive member.

[0017] In one embodiment, the drive member is provided with an injection channel, one of the first drive rod and the second drive rod is provided with an inlet communicating with the injection channel, and at least one of the first drive rod and the second drive rod is provided with an outlet communicating with the injection channel on its outer wall.

[0018] In one embodiment, the vertebral body relaxation device further includes a pedicle screw connected to the relaxation assembly, the pedicle screw having a mounting hole therein, and the drive member being inserted into the mounting hole;

[0019] The vertebral body relaxation device further includes a first limiting member, which passes through the pedicle screw and abuts against the driving member from the radial direction to limit the axial movement of the driving member relative to the pedicle screw; and / or, the vertebral body relaxation device further includes a second limiting member, the wall of the mounting hole is provided with a first stepped wall and a second stepped wall, the driving member is provided with a boss, when the driving member is inserted into the mounting hole, the side of the boss near the relaxation component abuts against the first stepped wall, the second limiting member is blocked by the second stepped wall and abuts against the side of the boss away from the relaxation component.

[0020] The present invention also provides a vertebral body spreading operation device, which can solve at least one of the above-mentioned technical problems.

[0021] A vertebral body spreading operation device includes an operating rod, which is connected to the driving member of the vertebral body spreading device to drive the driving member to rotate.

[0022] Beneficial effects:

[0023] This invention provides a vertebral body expansion device, including a driving member, two threaded sleeves, and an expansion assembly. The driving member includes a first driving rod and a second driving rod detachably connected, both of which are threaded. The threads on the first and second driving rods have different rotation directions. The two threaded sleeves are respectively fitted onto the first and second driving rods and respectively engage with their corresponding threads. The expansion assembly is fitted onto the driving member and each threaded sleeve, and both ends of the expansion assembly are connected to the two threaded sleeves. When the driving member is configured to rotate around its own axis, the first and second driving rods rotate synchronously, respectively driving the two threaded sleeves to move away from each other, so that the expansion assembly expands relative to the driving member. In this application, the threads on the first and second driving rods have different rotation directions. Therefore, when the first and second driving rods rotate, the corresponding threaded sleeves can be driven away from each other through the threads. By controlling the number of rotations of the threaded sleeves relative to the corresponding threads, the expansion height of the two ends of the expansion assembly corresponding to the driving member can be determined, achieving precise expansion of the vertebral body expansion device and improving the expansion accuracy of the vertebral body expansion device.

[0024] The present invention also provides a vertebral body relaxation operating device, including an operating rod for connecting to a drive component of the aforementioned vertebral body relaxation device to drive the drive component to rotate. This medical device can achieve at least one of the aforementioned technical effects. Attached Figure Description

[0025] Figure 1 This is a first schematic diagram of the vertebral body spreading device provided in an embodiment of the present invention, in which each support plate is spread relative to the driving member;

[0026] Figure 2This is a second schematic diagram showing the support plates being spread relative to the driving component in a vertebral body spreading device according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of a vertebral body spreading device provided in an embodiment of the present invention;

[0028] Figure 4 This is a front view of a vertebral body spreading device provided in an embodiment of the present invention;

[0029] Figure 5 This is a first cross-sectional view of a vertebral body spreading device provided in an embodiment of the present invention;

[0030] Figure 6 This is a top view of the drive component in a vertebral expansion device according to an embodiment of the present invention;

[0031] Figure 7 This is a cross-sectional view of the first and second drive rods in a vertebral body spreading device provided in an embodiment of the present invention when they are separated.

[0032] Figure 8 This is a cross-sectional view of the driving component in a vertebral body spreading device according to an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of a vertebral body spreading device provided in an embodiment of the present invention without the driving component;

[0034] Figure 10 This is a second cross-sectional view of a vertebral body spreading device provided in an embodiment of the present invention.

[0035] Reference numerals: 100-Driver; 110-First drive rod; 111-First thread; 112-Protrusion; 113-First mating end; 120-Second drive rod; 121-Second thread; 122-Groove; 123-Second mating end; 130-Injection channel; 131-Through hole; 132-Blind hole; 140-Outlet; 150-Inlet; 160-Boss; 161-First sidewall; 162-Second sidewall; 170-Third drive rod; 180-Limiting groove; 200-Threaded sleeve; 3 00-Spreading component; 310-Support plate; 320-Support arm; 321-Spreading rod; 322-First deformation groove; 323-Second deformation groove; 330-Connecting arm; 331-Third deformation groove; 332-Fourth deformation groove; 340-Connecting seat; 350-Supporting component; 400-Pedicle screw; 410-Mounting hole; 420-First limiting component; 430-Positioning hole; 440-Second limiting component; 470-First step wall; 480-Second step wall; 500-Limiting protrusion; 600-Operating rod. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] See Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 This is a first schematic diagram of the vertebral body spreading device provided in an embodiment of the present invention, in which each support plate is spread relative to the driving member; Figure 2 This is a second schematic diagram showing the support plates being spread relative to the driving component in a vertebral body spreading device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a vertebral body spreading device provided in an embodiment of the present invention; Figure 4 This is a front view of a vertebral body spreading device according to an embodiment of the present invention. The vertebral body spreading device provided in this embodiment includes a driving member 100, two threaded sleeves 200, and a spreading assembly 300. The driving member 100 includes a first driving rod 110 and a second driving rod 120 detachably connected. Both the first driving rod 110 and the second driving rod 120 are threaded, and the threads on the first driving rod 110 and the second driving rod 120 have different directions of rotation. The two threaded sleeves 200 are respectively fitted onto the first driving rod 110 and the second driving rod 120, and respectively engage with their corresponding threads. The spreading assembly 300 is fitted onto the driving member 100 and each threaded sleeve 200, and both ends of the spreading assembly 300 are respectively connected to the two threaded sleeves 200. When the driving member 100 is configured to rotate about its own axis, the first driving rod 110 and the second driving rod 120 rotate synchronously, and respectively drive the two threaded sleeves 200 to move away from each other, so that the spreading assembly 300 spreads relative to the driving member 100.

[0043] Specifically, in this application, the threads on the first drive rod 110 and the threads on the second drive rod 120 have different directions of rotation. When the first drive rod 110 and the second drive rod 120 rotate, they can drive the corresponding threaded sleeves 200 to move away from each other through the threads. By controlling the number of rotations of the threaded sleeves 200 relative to the corresponding threads, the opening height of the two ends of the opening assembly 300 corresponding to the drive member 100 can be determined, thereby realizing the precise opening of the vertebral opening device and improving the opening accuracy of the vertebral opening device.

[0044] For ease of distinction, the thread on the first drive rod 110 is defined as the first thread 111, and the thread on the second drive rod 120 is defined as the second thread 121. The part that mates with the first thread 111 is called the first thread 111 sleeve, and the part that mates with the second thread 121 is called the second thread 121 sleeve. The end face of the spreading assembly 300 facing away from the drive member 100, which supports the cone, is called the spreading end face.

[0045] In this application, the first drive rod 110 and the second drive rod 120 are detachable, allowing them to drive the corresponding threaded sleeves 200 to move before being connected to each other. This allows each threaded sleeve 200 to move to its corresponding preset position. After the first drive rod 110 and the second drive rod 120 are connected, the first drive rod 110 and the second drive rod 120 can drive the corresponding threaded sleeves 200 to move when the drive member 100 rotates, so that the opening end face of the opening assembly 300 can be opened at the target height, thereby improving the convenience and accuracy of the cone opening device.

[0046] It should be noted that, since the first thread 111 and the second thread 121 rotate in opposite directions, if the first drive rod 110 and the second drive rod 120 are a whole, when the drive member 100 extends into the two threaded sleeves 200, it is impossible to satisfy that both threaded sleeves 200 can move relative to the drive member 100 along the extension direction of the drive member 100. That is, one of the two threaded sleeves 200 will inevitably be unable to move relative to the drive member 100 to the preset position.

[0047] See Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, the threads of the first drive rod 110 and the second drive rod 120 have different pitches so that the two ends of the spreading assembly 300 are angled relative to the drive member 100.

[0048] Specifically, when the first drive rod 110 and the second drive rod 120 rotate, because the thread pitches of the first drive rod 110 and the second drive rod 120 are different, the corresponding threads drive the corresponding threaded sleeves 200 to move at different speeds, thereby enabling the opening end face of the opening assembly 300 to open at an angle, as per the attached instruction manual. Figure 2 Taking this as an example, in the open state, the two ends of the open end face are at different radial distances from the driving member 100, thereby enabling accurate support for vertebrae of any shape and improving the adaptability of the vertebral opening device.

[0049] It should be noted that, in this application, the pitch of the first thread 111 and the second thread 121 can be set according to the clinical vertebral lordosis angle requirements, so that after the spreading component 300 is spread relative to the driving component 100, the two ends of the spreading component 300 are spread at a preset angle and a preset height.

[0050] See Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 7 This is a cross-sectional view showing the separation of the first drive rod and the second drive rod in a vertebral body spreading device provided in an embodiment of the present invention. Figure 8 This is a cross-sectional view of the driving component in a vertebral body spreading device according to an embodiment of the present invention. In one embodiment, one end of the first driving rod 110 and the second driving rod 120 is provided with a groove 122, and the end of the other is provided with a protrusion 112. The protrusion 112 and the groove 122 are connected by threads or snap-fit, so that after the threaded sleeve 200 on the first driving rod 110 and the second driving rod 120 moves to the corresponding preset position, the first driving rod 110 and the second driving rod 120 can be easily connected. At the same time, the first driving rod 110 and the second driving rod 120 can rotate synchronously, that is, under one driving force, the two ends of the spreading component 300 can move at different speeds to the side away from the driving component 100, thereby improving the spreading efficiency of the vertebral body spreading device.

[0051] It should be noted that when the protrusion 112 and the groove 122 are connected by threads, the rotation direction of the drive member 100 when it drives the opening assembly 300 to open should make the threaded connection on the first drive rod 110 and the second drive rod 120 tend to be tighter, that is, the rotation direction of the drive member 100 during the opening operation is the same as the tightening direction of the threaded connection.

[0052] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 9 , Figure 9 This is a schematic diagram of a vertebral body spreading device provided in one embodiment of the present invention without the driving component. In one embodiment, the spreading assembly 300 further includes a support member 350 and two sets of support arms 320. The support member 350 is located on one side of the driving member 100 in the radial direction. One end of each set of support arms 320 is connected to two threaded sleeves 200, and the other end is connected to both ends of the support member 350. When the two threaded sleeves 200 move away from each other, the ends of the two sets of support arms 320 that are away from the corresponding threaded sleeves 200 move away from the driving member 100, thereby causing the support member 350 to move away from the driving member 100, so that the spreading assembly 300 spreads away from the driving member 100.

[0053] Specifically, the two sets of support arms 320 are respectively connected to opposite sides of the two threaded sleeves 200. When the driving member 100 rotates, causing the first threaded sleeve 111 and the second threaded sleeve 121 to move away from each other, the first threaded sleeve 111 and the second threaded sleeve 121 respectively drive the corresponding support arms 320 on the side closest to the driving member 100 to move away from each other, as per the attached instruction manual. Figure 1 and Figure 4 Taking the first thread 111 and the second thread 121 as an example, when they are relatively far apart, each support arm 320 rotates relative to the drive member 100, so that the angle between the side of each support arm 320 close to the drive member 100 and the drive member 100 gradually increases, that is, each support arm 320 gradually stands up relative to the drive member 100, thereby causing each support arm 320 to drive the two ends of the support member 350 to open relative to the drive member 100.

[0054] Since the two sets of support arms 320 are respectively connected to the opposite sides of the two threaded sleeves 200, the support points of the two sets of support arms 320 on the support member 350 are located at both ends of the support member 350, which helps to disperse pressure, provide better support strength, make the force more balanced, and improve the reliability of the vertebral body opening device.

[0055] In other embodiments, the two sets of support arms 320 may also be connected to opposite sides of the two threaded sleeves 200 respectively.

[0056] See Figure 2 , Figure 3 and Figure 4 In one embodiment, the support member 350 includes at least one support plate 310, each support plate 310 being arranged circumferentially around the drive member 100, and each set of support arms 320 including at least two spreading rods 321 arranged circumferentially around the drive member 100 and connected to a threaded sleeve 200, with one end of each support plate 310 being supported by at least two spreading rods 321 in a set of support arms 320.

[0057] Specifically, the spreading end face is located on the side of the support plate 310 away from the drive member 100. In a set of support arms 320, one end of each spreading rod 321 is connected to the corresponding support plate 310, and the other end is connected to the corresponding threaded sleeve 200. By having at least two spreading rods 321 in a set of support arms 320, both ends of each support plate 310 are supported by at least two spreading rods 321, thereby providing stable support force to each support plate 310, improving the stability of the support plate 310, and thus improving the reliability of the vertebral body spreading device. At the same time, since the movement of each spreading rod 321 does not interfere with each other, when dealing with multiple support plates 310, under the drive of the threaded sleeve 200, each spreading rod 321 in the same set of support arms 320 can drive the corresponding support plate 310 away from the drive member 100, so that each support plate 310 can be spread relative to the drive member 100, thereby achieving multi-directional support for the vertebral body and improving the adaptability of the vertebral body spreading device.

[0058] Furthermore, there are two support plates 310, located on both sides of the drive component 100, as per the instruction manual. Figure 4 Taking this as an example, the two support plates 310 are located on the upper and lower sides of the driving member 100. Under the drive of the driving member 100, the two support plates 310 can move away from the driving member 100 to be relatively spread apart, thereby increasing the spreading degree of the spreading component 300. At the same time, it increases the spreading efficiency of the spreading component 300 and improves the adaptability of the cone spreading device.

[0059] Furthermore, the side of the support plate 310 facing the drive member 100 is arc-shaped, which facilitates that both ends of each support plate 310 are stably supported by at least two corresponding spreading rods 321, while simultaneously receiving the same thrust from the corresponding spreading rods 321, thus stably spreading each support plate 310 relative to the drive member 100. The side of the support plate 310 away from the drive member 100 is arc-shaped, making the spreading end face arc-shaped, thereby reducing damage to tissues. In one embodiment, the support plate 310 can also be a flat plate.

[0060] See Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, each support rod 321 is connected to the end of the support plate 310 and has a first deformation groove 322. The opening of the first deformation groove 322 faces the drive member 100, so that each support rod 321 can approach one end of the corresponding support plate 310 and rotate relative to the corresponding support plate 310 away from the threaded sleeve 200 under the drive of the threaded sleeve 200, so that the corresponding support plate 310 can be opened.

[0061] See Figure 2 , Figure 3 and Figure 4 In one embodiment, each support rod 321 is connected to the end of the threaded sleeve 200 and has a second deformation groove 323. The opening of the second deformation groove 323 faces the side away from the driving member 100, so that each support rod 321 can approach one end of the corresponding threaded sleeve 200 and rotate relative to the corresponding threaded sleeve 200 towards the other threaded sleeve 200 under the drive of the threaded sleeve 200, so that the corresponding support plate 310 can be opened.

[0062] In this application, the support plate 310 can provide support force at both ends under the support of four expansion rods 321. At the same time, by setting a first deformation groove 322 and a second deformation groove 323 at both ends of each expansion rod 321, the deformation point of each expansion rod 321 can be controlled, avoiding the deviation of the deformation point from causing structural deformity and improving the reliability of the cone expansion device.

[0063] In other embodiments, the deformation structures at both ends of each support rod 321 can be adjusted to a hinge structure or other rotatable structure to achieve deformation.

[0064] See Figure 2 , Figure 3 and Figure 4 In one embodiment, the vertebral body spreading device further includes two connecting seats 340 and at least two connecting arms 330. The two connecting seats 340 are respectively sleeved on the ends of the first drive rod 110 and the second drive rod 120 that are relatively far apart. Both ends of the support member 350 are connected to a connecting seat 340 through a connecting arm 330. Each connecting arm 330 is used to support the corresponding support member 350 when the support member 350 is spread apart relative to the drive member 100.

[0065] Specifically, this embodiment increases the number of support points for supporting the support plate 310 by setting the connecting arm 330, thereby giving the support plate 310 better support performance and improving the reliability of the vertebral body spreading device.

[0066] See Figure 2 , Figure 3 and Figure 4In one embodiment, the connection point of each connecting arm 330 relative to the corresponding support plate 310 coincides with the connection point of the spreading rod 321 on the same side to the support plate 310. This ensures that when the support plate 310 is spread apart relative to the driving member 100, both the spreading rod 321 and the connecting arm 330 can rotate relative to the same position of the corresponding support plate 310, thereby reducing interference from the connecting arm 330 on the spreading of the corresponding support plate 310 and making the movement of each support plate 310 smoother. It should be noted that the number of connecting arms 330 corresponds to the number of spreading rods 321. Preferably, the number of spreading rods 321 is twice the number of connecting arms 330, meaning that the connection point of one end of each support plate 310 with two spreading rods 321 falls on a corresponding connecting arm 330, thus ensuring the strength of the connecting arm 330 and improving the reliability of each connecting arm 330 supporting each support plate 310.

[0067] See Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, each connecting arm 330 is provided with a third deformation groove 331 at the end connected to the support plate 310. The opening of the third deformation groove 331 faces the driving member 100, so that each connecting arm 330 can approach one end of the corresponding support plate 310 and rotate towards the threaded sleeve 200 under the drive of the corresponding support plate 310, thereby facilitating the support plate 310 to be spread open.

[0068] See Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, each connecting arm 330 is provided with a fourth deformation groove 332 at the end connected to the connecting seat 340. The opening of the fourth deformation groove 332 faces the side away from the driving member 100, so that each connecting arm 330 can approach the end of the corresponding connecting seat 340 and rotate away from the threaded sleeve 200 under the drive of the corresponding support member 350, so as to facilitate the support plate 310 to be spread open.

[0069] In this application, the two ends of each support plate 310 can provide support force under the support of four expansion rods 321 and four connecting arms 330. At the same time, by setting the first deformation groove 322, the second deformation groove 323, the third deformation groove 331 and the fourth deformation groove 332 on the expansion rod 321, the deformation point of each expansion rod 321 and each connecting arm 330 can be controlled, avoiding the deviation of the deformation point from causing structural deformity and improving the reliability of the cone body expansion device.

[0070] In other embodiments, the deformable structures at both ends of each connecting arm 330 can be adjusted to hinge structures or other structures that can rotate around an axis to achieve deformation.

[0071] See Figure 5 , Figure 7 and Figure 8 In one embodiment, the drive member 100 is provided with an injection channel 130, one of the first drive rod 110 and the second drive rod 120 is provided with an inlet 150 communicating with the injection channel 130, and at least one of the first drive rod 110 and the second drive rod 120 is provided with an outlet 140 communicating with the injection channel 130 on its outer wall.

[0072] Specifically, the inlet 150 is located on the side of the first drive rod 110 away from the second drive rod 120. Both the first drive rod 110 and the second drive rod 120 are provided with outlets 140. When injection materials such as bone cement and other bone-forming materials are injected through the inlet 150, the release of the injected materials can be better realized, thereby improving the osseointegration performance of the prosthesis. Preferably, the injection channel 130 extends along the extension direction of the drive member 100.

[0073] Furthermore, the first drive rod 110 is provided with a through hole 131, and the second drive rod 120 is provided with a blind hole 132. The blind hole 132 communicates with the through hole 131, forming an injection channel 130. The inlet 150 is located on the side of the through hole 131 away from the blind hole 132. Both the first drive rod 110 and the second drive rod 120 are provided with multiple circumferentially arranged outlets 140, thereby better realizing the release of the injected material. It should be noted that the diameter and shape of the outlet 140 can be circular, polygonal, or other irregularly shaped holes.

[0074] See Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In one embodiment, the vertebral body relaxation device further includes a pedicle screw 400 connected to the relaxation assembly 300, the pedicle screw 400 having a mounting hole 410 therein, and the drive member 100 being inserted into the mounting hole 410; the vertebral body relaxation device further includes a first limiting member 420, the first limiting member 420 passing through the pedicle screw 400 and abutting against the drive member 100 from the radial direction, so as to limit the axial movement of the drive member 100 relative to the pedicle screw 400.

[0075] Specifically, the pedicle screw 400 is used to connect to the vertebral body. The pedicle screw 400 is connected to the connecting seat 340 near the first thread 111. A limiting protrusion 500 is provided on the side of the pedicle screw 400 away from the spreading component 300. The pedicle screw 400 is provided with a positioning hole 430 communicating with the mounting hole 410. The first limiting member 420 passes through the positioning hole 430 and is threaded to the hole wall of the positioning hole 430. The first limiting member 420 abuts against the driving member 100 passing through the mounting hole 410. By rotating the first limiting member 420, the end of the first limiting member 420 can be pressed against the driving member 100, thereby restricting the movement of the driving member 100 relative to the pedicle screw 400.

[0076] Since the movement of the driving member 100 relative to the pedicle screw 400 is restricted, the movement of the connecting seat 340 connected to the pedicle screw 400 relative to the driving member 100 is also restricted. Therefore, during the process of the support plate 310 being opened relative to the driving member 100, the connecting seat 340, which is away from the pedicle screw 400, moves closer to the pedicle screw 400 under the influence of the connecting arm 330, thus facilitating the deformation of the opening assembly 300. Furthermore, because the movement of the driving member 100 relative to the pedicle screw 400 is restricted, the support plate 310 will not move between itself and the driving member 100 during the support process. This allows each support plate 310, the two opening rods 321 connected to both ends of the support plate 310, and the corresponding driving member 100 to form a stable quadrilateral structure, enabling each support to provide stable support force and improving the reliability of the vertebral body opening device.

[0077] In this embodiment, by changing the pitch of the first thread 111 and the second thread 121, the moving speed of the first thread 111 set and the second thread 121 set is proportionally changed, thereby achieving asynchronous deformation of the corresponding support rod 321, and thus achieving front-to-back angle changes at both ends of the support plate 310.

[0078] It should be noted that, because the position of the connecting seat 340 near the pedicle screw 400 is restricted, while the connecting seat 340 away from the pedicle screw 400 can move relative to the driving component 100, during the process where the two threaded sleeves 200 drive each support plate 310 to move via the corresponding spreading rods 321, each support plate 310 exerts a pulling force on each spreading rod 321 away from the pedicle screw 400. This causes each spreading rod 321 away from the pedicle screw 400 to deflect at a certain angle relative to the pedicle screw 400. That is, when the pitch of the first thread 111 and the second thread 121 is the same, the support plates 310 as a whole will not be parallel and spread apart. The specific rules are as follows:

[0079] When the pitch of the first thread 111 is twice the pitch of the second thread 121, the entire structure is parallel and spread out. When the pitch of the first thread 111 is less than twice the pitch of the second thread 121, the spread-out support plates 310 exhibit a smaller front-end spread height and a larger rear-end spread height, such as... Figure 2 As shown; conversely, the front end has a larger opening height while the rear end has a smaller opening height. This variation in tilt angle can accommodate different clinical needs regarding vertebral lordosis angle. It should be noted that "front end" here refers to the side closer to the pedicle screw at 40°, and "rear end" refers to the side farther from the pedicle screw at 40°.

[0080] In one embodiment, the connecting seat 340 on the side near the pedicle screw 400 is integrally formed with the pedicle screw 400, thereby simplifying the structure of the vertebral body relaxation device and improving the adaptability of the vertebral body relaxation device.

[0081] See Figure 7 and Figure 8 In one embodiment, the driving member 100 further includes a third driving rod 170 connected to the first driving rod 110. The third driving rod 170 has a limiting groove 180. The end of the first limiting member 420 extends into the limiting groove 180 and abuts against the bottom wall of the groove 180. The first limiting member 420 also abuts against the side wall of the groove, thereby stably restricting the movement of the driving member 100 and the pedicle screw 400, improving the reliability of the vertebral body expansion device. The first limiting member 420 is a screw. Preferably, the limiting groove 180 is circumferentially arranged on the third driving rod 170.

[0082] See Figure 4 , Figure 8 and Figure 10 , Figure 10 This is a second cross-sectional view of a vertebral body spreading device according to an embodiment of the present invention. In one embodiment, the vertebral body spreading device further includes a second limiting member 440. The wall of the mounting hole 410 is provided with a first stepped wall 470 and a second stepped wall 480. The driving member 100 is provided with a boss 160. When the driving member 100 is inserted into the mounting hole 410, the side of the boss 160 near the spreading component 300 abuts against the first stepped wall 470. The second limiting member 440 is blocked by the second stepped wall 480 and abuts against the side of the boss 160 away from the spreading component 300.

[0083] Specifically, the side of the boss 160 closest to the spreading assembly 300 is a first sidewall 161, which abuts against the first stepped wall 470 to restrict the movement of the drive member 100 relative to the pedicle screw 400 toward the spreading assembly 300. The side of the boss 160 furthest from the spreading assembly 300 is a second sidewall 162, which is flush with the second stepped wall 480 in the axial direction of the drive member 100. Therefore, the second limiting member 440 on the second stepped wall 480 restricts the movement of the drive member 100 relative to the pedicle screw 400 away from the spreading assembly 300, thereby stably limiting the relative movement of the drive member 100 relative to the pedicle screw 400. The second limiting member 440 is a ring, which is sleeved on the drive member 100 and connected to the second stepped wall 480. Preferably, the boss 160 is arranged around the circumference of the drive member 100.

[0084] An embodiment of the present invention also provides a vertebral body spreading operation device, which includes an operating rod 600. The operating rod 600 is used to connect to the driving member 100 of the above-mentioned vertebral body spreading device to drive the driving member 100 to rotate.

[0085] Specifically, the first drive rod 110 and the second drive rod 120 are respectively provided with a first mating end 113 and a second mating end 123 on their opposite sides. The operating rod 600 can transmit power to the first mating end 113 and the second mating end 123 respectively, thus facilitating the connection between the first drive rod 110 and the second drive rod 120, and also facilitating the rotation of the drive member 100. Compared to the prior art which requires additional operating components to be found for the first mating end 113 and the second mating end 123, the operating rod 600 in this application can accelerate the opening efficiency of the vertebral body opening operating device and improve its convenience.

[0086] The first mating end 113 and the second mating end 123 can be flat or cross-shaped structures. The operating lever 600 can be a wrench or similar device, as long as it enables convenient rotation of the first driving lever 110 and the second driving lever 120.

[0087] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 An embodiment of the present invention also provides a medical device, including an operating rod 600 and the above-mentioned vertebral body spreading device. The operating rod 600 is used to connect to the driving member 100 to drive the driving member 100 to rotate.

[0088] Specifically, in this application, the threads on the first drive rod 110 and the threads on the second drive rod 120 have different directions of rotation. When the first drive rod 110 and the second drive rod 120 rotate, they can drive the corresponding threaded sleeve 200 to move through the threads, thereby controlling the opening height of the two ends of the opening assembly 300 corresponding to the drive member 100, realizing the precise opening of the vertebral body opening device, and improving the adaptability of the medical device.

[0089] See Figure 2 , Figure 3 and Figure 4 In one embodiment, the present invention also provides a vertebral body support method, which uses the above-mentioned vertebral body spreading device to spread the vertebral body, the method comprising:

[0090] S10 determines the number of turns and pitch of the threads on the first drive rod 110 and the second drive rod 120 according to the required opening height of the vertebra, so as to determine the model of the first drive rod 110 and the second drive rod 120.

[0091] Specifically, the required opening height of the vertebral contact surface is determined by the patient's clinical data, and the number of turns and pitch of the first thread 111 and the second thread 121 are determined, thereby determining the model of the first drive rod 110, the second drive rod 120 and the two threaded sleeves 200.

[0092] S20 rotates the first driving member 100 and the second driving rod 120 respectively, so that the two threaded sleeves 200 rotate to the corresponding preset positions on the first driving member 100 and the second driving rod 120, and so that the first driving rod 110 and the second driving rod 120 are connected, so that the first driving rod 110 and the second driving rod 120 are connected in transmission.

[0093] S30 inserts the expansion component 300 into the affected area and rotates the drive rod so that the two threaded sleeves 200 drive the expansion component 300 to expand to the target height.

[0094] Specifically, the vertebral body expansion device is inserted into the affected area through the surgical channel with the assistance of special instruments. The drive component 100 is rotated by rotating a special wrench and other transmission mechanisms. This causes the first drive rod 110 and the second drive rod 120 to rotate synchronously, so that the two threaded sleeves 200 move relative to each other. This drives the two ends of the expansion component 300 to expand relative to the drive component 100, so that the expansion component 300 is expanded to the target height.

[0095] 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.

[0096] 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 spreading device, characterized in that, The vertebral body expansion device includes: The driving component (100) includes a first driving rod (110) and a second driving rod (120) that are detachably connected. Both the first driving rod (110) and the second driving rod (120) are provided with threads, and the threads on the first driving rod (110) and the second driving rod (120) have different directions of rotation. Two threaded sleeves (200) are respectively fitted onto the first drive rod (110) and the second drive rod (120), and respectively mate with the corresponding threads; and, A spreading component (300) is sleeved on the drive member (100) and each of the threaded sleeves (200), and both ends of the spreading component (300) are respectively connected to the two threaded sleeves (200); When the first drive rod (110) and the second drive rod (120) are in a connected state, and the drive member (100) is configured to rotate about its own axis, the first drive rod (110) and the second drive rod (120) rotate synchronously and drive the two threaded sleeves (200) to move away from each other, so that the spreading assembly (300) is spread apart relative to the drive member (100); when the first drive rod (110) and the second drive rod (120) are in a separated state, the first drive rod (110) and the second drive rod (120) can drive the corresponding threaded sleeves (200) to move, so that each threaded sleeve (200) moves to the corresponding preset position.

2. The vertebral body spreading device according to claim 1, characterized in that, The first drive rod (110) and the second drive rod (120) have different thread pitches so that the two ends of the spreading assembly (300) are angled relative to the drive member (100).

3. The vertebral body spreading device according to claim 1, characterized in that, One of the first drive rod (110) and the second drive rod (120) has a groove (122) at one end and a protrusion (112) at the other end. The protrusion (112) and the groove (122) are connected by a thread or a snap-fit ​​connection.

4. The vertebral body spreading device according to any one of claims 1-3, characterized in that, The spreading assembly (300) also includes a support member (350) and two sets of support arms (320). The support member (350) is located on one side of the radial direction of the drive member (100). One end of each set of support arms (320) is connected to one of the two threaded sleeves (200), and the other end is connected to both ends of the support member (350). When the two threaded sleeves (200) move away from each other, the two sets of support arms (320) move away from the corresponding threaded sleeves (200) to the side away from the drive member (100), so as to drive the support member (350) away from the drive member (100) so that the spreading assembly (300) spreads away from the drive member (100).

5. The vertebral body spreading device according to claim 4, characterized in that, The support member (350) includes at least one support plate (310), each of the support plates (310) being arranged circumferentially around the drive member (100), each set of support arms (320) including at least two spreading rods (321) arranged circumferentially around the drive member (100) and connected to a threaded sleeve (200), one end of each support plate (310) being supported by at least two of the spreading rods (321) in a set of support arms (320).

6. The vertebral body spreading device according to claim 5, characterized in that, Each of the aforementioned support rods (321) has a first deformation groove (322) at the end connected to the support plate (310), the opening of the first deformation groove (322) facing the drive member (100); and / or, each of the aforementioned support rods (321) has a second deformation groove (323) at the end connected to the threaded sleeve (200), the opening of the second deformation groove (323) facing the side away from the drive member (100).

7. The vertebral body spreading device according to claim 4, characterized in that, The vertebral body spreading device further includes two connecting seats (340) and at least two connecting arms (330). The two connecting seats (340) are respectively sleeved on the relatively far ends of the first drive rod (110) and the second drive rod (120). Both ends of the support member (350) are connected to the connecting seat (340) through a connecting arm (330). Each connecting arm (330) is used to support the corresponding support member (350) when the support member (350) is spread relative to the drive member (100).

8. The vertebral body spreading device according to claim 7, characterized in that, Each of the connecting arms (330) has a third deformation groove (331) at the end connected to the support member (350), with the opening of the third deformation groove (331) facing the drive member (100); and / or, each of the connecting arms (330) has a fourth deformation groove (332) at the end connected to the connecting seat (340), with the opening of the fourth deformation groove (332) facing the side away from the drive member (100).

9. The vertebral body spreading device according to any one of claims 1-3, characterized in that, The drive member (100) is provided with an injection channel (130), one of the first drive rod (110) and the second drive rod (120) is provided with an inlet (150) communicating with the injection channel (130), and at least one of the first drive rod (110) and the second drive rod (120) is provided with an outlet (140) communicating with the injection channel (130) on its outer wall.

10. The vertebral body spreading device according to any one of claims 1-3, characterized in that, The vertebral body relaxation device also includes a pedicle screw (400) connected to the relaxation assembly (300), the pedicle screw (400) having a mounting hole (410) therein, and the drive member (100) being inserted into the mounting hole (410). The vertebral body expansion device further includes a first limiting member (420), which passes through the pedicle screw (400) and abuts against the drive member (100) radially to restrict the axial movement of the drive member (100) relative to the pedicle screw (400); and / or, the vertebral body expansion device further includes a second limiting member (440), the wall of the mounting hole (410) is provided with a first stepped wall (470) and a second stepped wall (480), the drive member (100) is provided with a boss (160), when the drive member (100) is inserted into the mounting hole (410), the side of the boss (160) near the expansion component (300) abuts against the first stepped wall (470), the second limiting member (440) blocks the second stepped wall (480) and abuts against the side of the boss (160) away from the expansion component (300).

11. A vertebral body spreading operating device, characterized in that, The vertebral body spreading device includes an operating rod (600), which is connected to the drive member (100) of the vertebral body spreading device according to any one of claims 1-10, so as to drive the drive member (100) to rotate.

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