Intravertebral bone scaffolding device and vertebral peg and rod system

Abstract

This invention provides an intravertebral bone support device and a vertebral body screw-rod system, relating to the field of medical prosthesis technology. By setting a locking part on the support assembly, during the installation of the support assembly into the vertebral body, the locking part embeds into the vertebral body when the support assembly rotates, thereby preventing the entire support device from dislodging backward and maintaining its height for a long time. Furthermore, after installation, the sealing part can seal the opening in the vertebral body, thereby sealing the bone cement flowing out of the support assembly within the vertebral body, preventing bone cement from leaking backward, and alleviating the technical problem of vertebral body height loss after long-term implantation of vertebral prostheses in the prior art.

Description

Technical Field

[0001] This invention relates to the field of medical prosthesis technology, and in particular to an intravertebral bone support device and a vertebral screw-rod system. Background Technology

[0002] Osteoporosis is a systemic bone metabolic disease characterized by decreased bone mass and destruction of bone microstructure, and has become a significant public health issue affecting the health of middle-aged and elderly people. With the increasing aging of the population, the incidence of osteoporotic vertebral compression fractures is rising year by year. In clinical treatment, minimally invasive surgeries such as percutaneous vertebroplasty and percutaneous kyphoplasty have become the mainstream methods for treating osteoporotic vertebral compression fractures due to their advantages of minimal trauma and rapid recovery.

[0003] These types of surgeries typically involve implanting an expandable vertebral prosthesis via a pedicle approach and then reconstructing vertebral height and stability by injecting bone cement.

[0004] However, for example, the vertebral intramedullary bone scaffold assembly disclosed in CN111096825A focuses on immediate restoration of vertebral height but neglects long-term biomechanical adaptation. Due to the decreased bone quality of osteoporotic vertebrae, the prosthesis-bone cement-bone composite will experience stress shielding during long-term load-bearing, leading to further bone resorption around the prosthesis and loss of vertebral height. This mechanical failure directly affects the long-term efficacy of surgery and has become a key issue that urgently needs to be addressed in the field of minimally invasive treatment of osteoporotic vertebral compression fractures. Summary of the Invention

[0005] The purpose of this invention is to provide an intravertebral bone support device and a vertebral screw-rod system to alleviate the technical problem of vertebral height loss after long-term implantation of vertebral prostheses in the prior art.

[0006] In a first aspect, the vertebral body bone support device provided by the present invention includes: a support assembly, a locking part, and a sealing part; The support assembly is configured to deploy within the vertebral body to support the vertebral body and to deliver bone cement into the vertebral body; The locking portion is connected to the end of the support assembly away from the vertebral body, and the locking portion is configured to be embedded in the vertebral body to restrict the support assembly within the vertebral body. The sealing portion is connected to the locking portion at the end away from the stent assembly, and the sealing portion is used to seal the bone cement flowing out of the stent assembly into the vertebral body.

[0007] In an optional implementation, The sealing part includes a sliding rod and a sliding sleeve; One end of the slide rod is fixedly connected to the locking part, the sliding sleeve is sleeved on the slide rod, and the sliding sleeve is configured to move along the slide rod.

[0008] In an optional implementation, The sliding sleeve has a groove, and the sliding rod passes through the groove.

[0009] In an optional implementation, The groove opening size is smaller than the radial dimension of the slide rod, so that the groove wall can confine the slide rod within the groove.

[0010] In an optional implementation, The vertebral body bone support device also includes a connector; The connector is fixedly connected to the end of the slide bar away from the locking part, and the connector is used to connect to an external tool.

[0011] In an optional implementation, The support assembly includes a support body and a support rod; The support rod passes through the bracket body and is connected to the bracket body. One end of the bracket body is connected to the locking part. When the bracket body is configured to fix the support rod, it pushes the locking part to move towards the front end. The bracket body extends into a hexagonal structure.

[0012] In an optional implementation, The inner wall of the support rod has an internal thread structure, and the joint, the slide rod and the locking part are provided with a hollow channel. The hollow channel is used to allow external tools to be inserted into the support rod and connected to the internal thread structure to restrict the movement of the support rod.

[0013] In an optional implementation, The locking part includes a locking body, a first threaded section, and a second threaded section; The two ends of the locking body are respectively connected to the slide rod and the bracket body, and the first threaded section and the second threaded section are arranged opposite to each other on both sides of the locking body.

[0014] In an optional implementation, The main body of the support has a first support plate and a second support plate arranged opposite to each other, and both the first support plate and the second support plate are used to support the vertebral body; The locking body has a first flat surface and a second flat surface that are arranged opposite to each other. The first flat surface is flush with the first support plate, and the second flat surface is flush with the second support plate.

[0015] Secondly, the vertebral body screw-rod system provided by the present invention includes a screw seat, a screw plug, a fixing rod, and the vertebral body bone support device. The connector on the vertebral body bone support device is disposed in the nail seat, and the sealing part passes through the nail seat and is connected to the connector; The fixing rod is disposed within the nail seat and is located on the side of the connector portion away from the bottom of the nail seat. The screw plug is disposed within the nail seat and is connected to the nail seat. The screw plug is used to confine the fixing rod and the connector portion within the nail seat.

[0016] The vertebral body bone support device provided by the present invention has a locking part on the support assembly. During the installation of the support assembly into the vertebral body, when the support assembly rotates, the locking part is embedded in the vertebral body, so that the entire support device cannot be dislodged backward, thus maintaining the height for a long time. After installation, the sealing part can seal the opening of the vertebral body, thereby sealing the bone cement flowing out of the support assembly into the vertebral body, so that the bone cement cannot leak backward, thus alleviating the technical problem of vertebral body height loss after long-term implantation of vertebral prostheses in the prior art. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the vertebral bone support device in the deployed state according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the vertebral bone support device provided in an embodiment of the present invention in its deployed state from another perspective. Figure 3 This is a schematic diagram of the vertebral bone support device in a contracted state according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the joint portion of the intravertebral bone support device provided in an embodiment of the present invention.

[0019] Icons: 100-Support assembly; 110-Support body; 111-First support plate; 112-Second support plate; 120-Support rod; 121-Internal thread structure; 200-Locking part; 210-Locking body; 220-First threaded section; 230-Second threaded section; 240-First flat surface; 250-Second flat surface; 300-Sealing part; 310-Slide rod; 320-Slide sleeve; 400-Joint part; 500-Hollow channel. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] like Figure 1-4As shown, the intravertebral bone scaffold device provided in this embodiment includes a scaffold assembly 100, a locking part 200, and a sealing part 300. The scaffold assembly 100 is configured to deploy inside the vertebral body to support a collapsed vertebral structure and has the function of delivering bone cement into the vertebral body. The scaffold assembly 100 adopts a structure disclosed in the prior art, specifically referring to the intravertebral bone scaffold assembly 100 disclosed in CN111096825A. The core difference is that the driving part in the original patent is replaced by the locking part 200 in this embodiment, and the external connecting part in the original design is eliminated, thereby simplifying the overall structure and improving integration compatibility with the subsequent rod and screw system.

[0025] The locking part 200 is connected to the end of the support assembly 100 away from the vertebral body. Its function is to embed itself into the vertebral bone after the support assembly 100 enters the vertebral body, forming a mechanical locking effect to prevent the entire device from dislodging backward during use. The locking part 200 enters the preset channel together with the support assembly 100 during implantation and achieves a self-locking effect after rotational positioning is completed.

[0026] The sealing part 300 is located at one end of the locking part 200 away from the support assembly 100. It is mainly used to seal the bone cement outflow path, ensure that the bone cement is effectively confined within the vertebral body during the injection process, avoid posterior leakage, and improve surgical safety.

[0027] In an optional embodiment, the sealing part 300 includes a slide rod 310 and a sliding sleeve 320. One end of the slide rod 310 is fixedly connected to the locking part 200, and the other end extends to the external operating area. The sliding sleeve 320 is sleeved on the slide rod 310 and can slide freely along the axial direction of the slide rod 310. The sliding sleeve 320 has a groove, and the slide rod 310 passes through the groove. The groove opening size is smaller than the radial size of the slide rod 310, so that the slide rod 310 is restricted inside the groove. The sliding sleeve 320 can move relative to the slide rod 310 within a certain stroke, but will not disengage, allowing the sealing part 300 to maintain dynamic adaptability during insertion, while providing a stable sealing interface at the final position.

[0028] Furthermore, the vertebral scaffold device also includes a connector 400, which is fixedly connected to the end of the slide bar 310 away from the locking part 200, for coupling connection with an externally applied torque and thrust tool. The connector 400 can be designed as a quincunx shape or other non-circular cross-section interface to facilitate clamping and rotational and propulsive movements by a special tool.

[0029] The support assembly 100 includes a support body 110 and a support rod 120 passing through it. The support rod 120 passes through the support body 110, and one end of the support body 110 is connected to the locking part 200. When the support rod 120 is fixed, by pushing the locking part 200 forward, the support body 110 can be deformed and unfolded, eventually forming a stable hexagonal support structure, similar to the working principle of a jack, to achieve uniform support for the vertebral wall.

[0030] The inner wall of the support rod 120 is provided with an internal thread structure 121, and the joint part 400, the slide rod 310 and the locking part 200 are all provided with a through hollow channel 500. This channel allows external tools to pass through and connect with the internal thread of the support rod 120, thereby locking the position of the support rod 120 during operation so that it does not move with the rotation action and ensuring the effective transmission of the unfolding action.

[0031] The locking part 200 includes a locking body 210 and a first threaded section 220 and a second threaded section 230 respectively disposed on its two sides. These two threaded sections are arranged opposite each other and can be used to create an interlocking effect with surrounding tissues or auxiliary components to enhance the pull-out resistance. The locking body 210 is connected to a slide rod 310 and a support body 110 at both ends, which serve to transmit force and connect the structure. In addition, the locking body 210 has a first flat surface 240 and a second flat surface 250, which are arranged opposite each other; correspondingly, the support body 110 is provided with a first support plate 111 and a second support plate 112, which are also arranged opposite each other, for directly contacting and supporting the upper and lower endplates of the vertebral body.

[0032] When the device is in the retracted state, the first flat surface 240 of the locking body 210 is flush with the first support plate 111, and the second flat surface 250 is flush with the second support plate 112.

[0033] This embodiment also provides a vertebral body screw-rod system, comprising a screw base, a screw plug, a fixation rod, and the aforementioned intravertebral bone support device. During installation, the connector 400 of the intravertebral bone support device is inserted into the screw base, and the sealing portion 300 passes through the screw base and connects to the connector 400. The fixation rod is placed inside the screw base, positioned above the connector 400, i.e., on the side away from the bottom of the screw base. Then, the screw plug is screwed into the screw base and tightened, causing the screw plug to simultaneously press against both the fixation rod and the connector 400, thereby firmly locking both within the screw base and achieving seamless integration of the bone support device with a traditional spinal internal fixation system.

[0034] In practical applications, the working principle of this device is as follows: First, the intravertebral bone support device is inserted longitudinally into the pre-prepared vertebral body channel. Since the support body 110 has a rectangular projection, its longitudinal dimension is larger than its transverse dimension. When the device is rotated around its axis using a special tool, the locking part 200 embeds into the vertebral bone, forming an anti-retraction mechanism to prevent the device from retracting. Subsequently, the tool is used to connect to the support rod 120 via a threaded connection through the hollow channel 500, fixing the position of the support rod 120. Simultaneously, the locking part 200 is pushed forward, causing the support body 110 to gradually unfold into a hexagonal expansion structure, restoring the vertebral height. In this state, bone cement is injected from the rear end through the hollow channel 500. The bone cement flows into the hexagonal cavity formed after the support body 110 unfolds, filling the surrounding gaps. At this time, the sliding sleeve 320 acts as a sealing element, closely adhering to the tail end of the channel, blocking the posterior flow path of the bone cement and significantly reducing the risk of leakage.

[0035] The specific procedure is as follows: During the operation, a rectangular channel slightly smaller than the longitudinal cross-section of the main body 110 is pre-cut at the pedicle of the collapsed vertebral body using a special instrument. Then, the bone support device within the vertebral body is guided into the fracture compression area using the channel tube. The device continues to move forward until the sliding sleeve 320 completely seals the end of the channel. A special operating tool is connected through the quincunx-shaped connector 400 at the tail end, and a rotational force is applied along the axis of the sliding rod 310, causing the main body 110 with the ball head to gradually change from a vertical to a horizontal state. During this process, the front end of the support rod 120 is stressed, pushing the locking part 200 and triggering the main body 110 to unfold into a hexagonal support structure. After confirming that the unfolding is in place, bone cement is injected through the hollow channel 500. After it is fully filled and solidified, the operating tool is removed, the nail seat is fitted onto the connector 400 and engaged with the fixation rod, and then locked with a screw plug. Finally, it is connected to the conventional nail-rod system to maintain the stability of the spinal segment.

[0036] The beneficial effects of this solution are significant: the embedded locking mechanism of the locking part 200 effectively prevents postoperative displacement of the device and ensures long-term maintenance of the reduction height; the design of the sealing part 300 greatly reduces the possibility of reverse leakage of bone cement and improves the safety boundary of the operation; the entire process is simple to operate, shortens the operation time, and reduces patient trauma; at the same time, the device can be integrated with the existing rod and screw system to achieve biomechanical synergistic load-bearing, promote fracture healing and functional recovery, and has good clinical application value.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertebral intravertebral bone support device, characterized in that, include: The bracket assembly (100), the locking part (200), and the sealing part (300); The support assembly (100) is configured to deploy within the vertebral body to support the vertebral body and to deliver bone cement into the vertebral body; The locking part (200) is connected to the end of the support assembly (100) away from the vertebral body, and the locking part (200) is configured to be embedded in the vertebral body to restrict the support assembly (100) within the vertebral body; The sealing part (300) is connected to the locking part (200) at one end away from the support assembly (100), and the sealing part (300) is used to seal the bone cement flowing out of the support assembly (100) in the vertebral body; The sealing part (300) includes a slide rod (310) and a slide sleeve (320). One end of the slide rod (310) is fixedly connected to the locking part (200), the sliding sleeve (320) is sleeved on the slide rod (310), and the sliding sleeve (320) is configured to move along the slide rod (310); The vertebral bone support device also includes a connector (400). The connector (400) is fixedly connected to the end of the slide bar (310) away from the locking part (200), and the connector (400) is used to connect to an external tool; The support assembly (100) includes a support body (110) and a support rod (120). The support rod (120) passes through the bracket body (110) and is connected to the bracket body (110). One end of the bracket body (110) is connected to the locking part (200). When the bracket body (110) is configured to fix the support rod (120), it pushes the locking part (200) to move towards the front end. The bracket body (110) extends into a hexagonal structure. The inner wall of the support rod (120) has an internal thread structure (121). The joint (400), the slide rod (310) and the locking part (200) are provided with a hollow channel (500). The hollow channel (500) is used to allow external tools to be inserted into the support rod (120) and connected to the internal thread structure (121) to restrict the movement of the support rod (120).

2. The vertebral intravertebral bone support device according to claim 1, characterized in that, The sliding sleeve (320) has a groove, and the sliding rod (310) passes through the groove.

3. The intravertebral bone support device according to claim 2, characterized in that, The groove opening size is smaller than the radial dimension of the slide bar (310) so that the groove wall can confine the slide bar (310) in the groove.

4. The intravertebral bone support device according to claim 1, characterized in that, The locking part (200) includes a locking body (210), a first threaded section (220), and a second threaded section (230); The two ends of the locking body (210) are connected to the slide rod (310) and the bracket body (110) respectively, and the first threaded section (220) and the second threaded section (230) are arranged opposite to each other on both sides of the locking body (210).

5. The intravertebral bone support device according to claim 4, characterized in that, The main body of the support (110) has a first support plate (111) and a second support plate (112) arranged opposite to each other, both the first support plate (111) and the second support plate (112) are used to support the vertebral body; The locking body (210) has a first flat surface (240) and a second flat surface (250) arranged opposite to each other. The first flat surface (240) is flush with the first support plate (111), and the second flat surface (250) is flush with the second support plate (112).

6. A vertebral rod system, characterized in that Includes a pin seat, a screw plug, a fixation rod, and an intravertebral bone support device as described in any one of claims 1-5; The connector (400) on the vertebral body bone support device is disposed in the nail seat, and the sealing part (300) passes through the nail seat and is connected to the connector (400); The fixing rod is disposed in the nail seat and is located on the side of the connector (400) away from the bottom of the nail seat. The screw plug is disposed in the nail seat and is connected to the nail seat. The screw plug is used to restrict the fixing rod and the connector (400) within the nail seat.

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