Minimally invasive spine interbody fusion cage

Abstract

The minimally invasive spine interbody fusion cage comprises a shell, a telescopic part and an adjusting part, the adjusting part is arranged in the shell, and the shell is connected with the adjusting part in a matched mode through the telescopic part; during use, the adjusting part is rotated to drive the telescopic part to stretch out and draw back, so that the shell is expanded or contracted. The shell is connected with the adjusting part in a matched mode through the telescopic part, so that the shell is driven by the telescopic part to be expanded or contracted under rotation of the adjusting part, the operation space in the spine minimally invasive surgery can be enlarged, and a user can treat the focus more easily. The device is easy to operate, simple in structure, small in trauma and suitable for clinical application in the orthopedics department.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a minimally invasive interbody fusion device for the spine. Background Technology

[0002] Minimally invasive spinal surgery means avoiding large incisions while mitigating certain medical risks. It utilizes tiny incisions or puncture channels, employing specialized instruments and devices, and guided by imaging or navigation technology. The procedure proceeds from within the normal anatomical structure to the lesion, using various miniature manual or electric instruments and equipment under visual guidance. The goal is to achieve smaller incisions, less tissue trauma, less bleeding, higher precision, better results, and faster postoperative functional recovery compared to traditional or standard spinal surgery. However, current minimally invasive spinal surgery may result in less thorough treatment of lesions, stenosis, or herniations due to limited operating space, leading to a slightly higher recurrence rate compared to open surgery. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a minimally invasive interbody fusion device for the spine, which solves the problem that the lesion is not thoroughly treated due to the small operating space during minimally invasive spinal surgery in the prior art.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A minimally invasive interbody fusion device for the spine includes a housing, a telescopic part, and an adjustment part. The adjustment part is disposed inside the housing, and the housing is connected to the adjustment part through the telescopic part. In use, the telescopic part is extended or retracted by rotating the adjustment part.

[0006] In the above solution, the minimally invasive interbody fusion device also includes a support part, which is disposed inside the housing and is connected to the adjustment part through the telescopic part; in use, the telescopic part is extended or retracted by rotating the adjustment part.

[0007] In the above solution, the adjusting part includes a threaded rod that passes through the housing and the supporting part, and the telescopic part is disposed at the position where the threaded rod connects with the housing and the supporting part.

[0008] In the above scheme, the telescopic part is a telescopic nut, and the threaded rod is provided with threads that cooperate with the telescopic nut.

[0009] In the above scheme, the number of telescopic nuts and the number of threaded rods connected to the housing and support respectively correspond to each other.

[0010] In the above scheme, the adjusting part further includes an adjusting rod, which is connected to the end of the threaded rod to drive the threaded rod to rotate.

[0011] In the above scheme, an interface is provided at the connection between the threaded rod and the adjusting rod, an internal thread is provided on the inner wall of the interface, and an external thread is provided at the end of the adjusting rod to engage with the internal thread.

[0012] In the above scheme, the interface is hexagonal in shape.

[0013] In the above scheme, the diameter of the threaded rod is larger than the diameter of the adjusting rod.

[0014] In the above scheme, both the threaded rod and the adjusting rod are hollow structures. After the threaded rod and the adjusting rod are connected, the hollow structure forms a channel for the passage of surgical instruments.

[0015] In the above scheme, the shell is provided with a number of bone graft holes, and the surface of the shell is provided with an anti-slip layer.

[0016] Compared with existing technologies, the shell in this invention is connected to the telescopic part and the adjustment part, so that the shell can be expanded or contracted by the telescopic part driven by the rotation of the adjustment part. This increases the operating space during minimally invasive spinal surgery, making it easier for the user to treat lesions. This invention is simple to operate, has a simple structure, and causes minimal trauma, making it suitable for orthopedic clinical applications. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a minimally invasive interbody fusion device for the spine in its deployed state, provided as an embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the extended portion of a minimally invasive interbody fusion device for the spine, provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the unfolded state of a minimally invasive interbody fusion device for the spine, provided in an embodiment of the present invention.

[0020] Figure 4 This is a front view schematic diagram of the contracted state of a minimally invasive interbody fusion device for the spine, provided in an embodiment of the present invention.

[0021] Figure 5 This is a side view of the retracted state of the telescopic part in a minimally invasive interbody fusion device for the spine, provided in an embodiment of the present invention.

[0022] Figure 6 This is a side view of a minimally invasive interbody fusion device for the spine, provided in an embodiment of the present invention.

[0023] Figure 7 This is a partial enlarged view of a minimally invasive interbody fusion device for the spine provided in an embodiment of the present invention.

[0024] In the figure, 1. shell, 11. bone graft hole, 12. anti-slip layer, 2. telescopic part, 21. telescopic nut, 3. adjustment part, 31. threaded rod, 32. adjustment rod, 33. interface, 34. channel, 4. support part. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] In the description of this invention, it should be clarified that the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," and "horizontal," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are merely for the convenience of describing this invention. They do not imply that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example

[0028] The present invention provides a minimally invasive interbody fusion device for the spine, comprising a housing 1, a telescopic part 2, and an adjustment part 3. The adjustment part 3 is disposed inside the housing 1, and the housing 1 is connected to the adjustment part 3 through the telescopic part 2. In use, the telescopic part 2 is extended or retracted by rotating the adjustment part 3.

[0029] With the above solution, the shell of this invention is connected to the adjusting part 3 via the telescopic part 2, so that the shell 1 can be expanded or contracted by the telescopic part 2 under the rotation of the adjusting part 3. This increases the operating space during minimally invasive spinal surgery, making it easier for the user to treat lesions. This invention is simple to operate, has a simple structure, and causes minimal trauma, making it suitable for orthopedic clinical applications.

[0030] See Figures 1 to 5In a specific implementation of this invention, the minimally invasive interbody fusion device further includes a support part 4, which is disposed within the housing 1 and is connected to the adjustment part 3 via a telescopic part 2. During use, rotating the adjustment part 3 causes the telescopic part 2 to extend or retract, thereby expanding or contracting the housing 1 and the support part 4. The support part 4 is used to support the housing 1.

[0031] In a specific implementation of this embodiment of the invention, the adjusting part 3 further includes a threaded rod 31 that passes through the housing 1 and the support part 4. The telescopic part 2 is located at the position where the threaded rod 31 connects to the housing 1 and the support part 4. The connection between the threaded rod 31 and the telescopic part 2 allows the support part 4 to shift, thereby causing the housing 1 to expand or contract.

[0032] Specifically, when the threaded rod 31 is rotated clockwise, the housing 1 expands; when the threaded rod 31 is rotated counterclockwise, the housing 1 contracts.

[0033] See Figure 2 In a specific implementation of this embodiment of the invention, the telescopic part 2 is a telescopic nut 21, and the threaded rod 31 is provided with threads that cooperate with the telescopic nut 21. The cooperation between the threaded rod 31 and the telescopic nut 21 can cause the support part 4 to move.

[0034] Furthermore, the number of telescopic nuts 21 and the number of threaded rods 31 connected to the housing 1 and the support part 4 correspond to the number of connections, respectively.

[0035] See Figure 1 and Figure 2 In a specific implementation of this embodiment of the invention, the adjusting part 3 further includes an adjusting rod 32, which is connected to the end of the threaded rod 31 to drive the threaded rod 31 to rotate.

[0036] See Figure 1 and Figure 2 In a specific implementation of this embodiment of the invention, an interface 33 is further provided at the connection between the threaded rod 31 and the adjusting rod 32. An internal thread is provided on the inner wall of the interface 33, and an external thread is provided at the end of the adjusting rod 32 to engage with the internal thread. The engagement of the internal thread at the interface 33 with the external thread on the adjusting rod 32 allows for a detachable connection between the adjusting rod 22 and the threaded rod 21.

[0037] See Figure 6 In a specific implementation of this invention, the interface 32 is further shaped as an internal hexagon.

[0038] See Figures 1 to 5In a specific implementation of this invention, the diameter of the threaded rod 31 is larger than the diameter of the adjusting rod 32, which facilitates the adjusting rod 32 to drive the threaded rod 31 to rotate, thereby causing the housing 1 to unfold or extend.

[0039] See Figure 1 and Figure 6 In a specific implementation of this invention, both the threaded rod 31 and the adjusting rod 32 are hollow structures. After the threaded rod 31 and the adjusting rod 32 are connected, the hollow structure forms a channel 34 for the passage of surgical instruments. The channel 34 serves as a guide channel for the Kirschner wire, facilitating the user's use of the Kirschner wire in surgery.

[0040] See Figure 1 , Figure 2 and Figure 6 In a specific implementation of this invention, the shell 1 is further provided with a plurality of bone graft holes 11, and the surface of the shell 1 is provided with an anti-slip layer 12. The materials required for the surgery can be placed into the shell 1 through the bone graft holes 11, and the anti-slip layer 12 can prevent the minimally invasive interbody fusion device from sliding in the patient's body.

[0041] The working principle of a minimally invasive interbody fusion device for the spine provided in this embodiment is as follows:

[0042] See Figures 1 to 5 First, the minimally invasive interbody fusion device is in a retracted state. Then, the threaded end of the adjusting rod 32 is aligned with the interface 33, and the adjusting rod 32 is securely connected to the threaded rod 31. Next, the retracted minimally invasive interbody fusion device is slowly inserted into the skin at the surgical site. After confirming the position, the adjusting rod 32 is held and rotated clockwise. The adjusting rod 32 drives the threaded rod 31 to rotate clockwise, causing the telescopic nut 21 to shift, thereby allowing the support part 4 to slowly unfold the shell 1. See also... Figure 1 At this point, the shell 1 is fully expanded; then, the adjusting rod 32 is removed from the interface 33, and then operations are performed within the channel 34 using Kirschner wires, while simultaneously inserting medication or performing other surgical procedures into the bone graft hole 11; finally, the Kirschner wires are removed, and then the adjusting rod 32 is connected to the threaded rod 31, and the adjusting rod 32 is rotated counterclockwise. At this point, the adjusting rod 32 drives the threaded rod 31, and the shell 1 begins to contract. When the shell 1 is fully contracted, see [link to relevant documentation]. Figure 4 At this point, the minimally invasive interbody fusion device is removed from the patient's body.

[0043] In summary, in this invention, the housing 1 is connected to the threaded rod 31 in the adjusting part 3 via a telescopic nut 21. This allows the housing 1 to expand or contract under the rotation of the adjusting rod 32 and the threaded rod 31 in the adjusting part 3, driven by the telescopic nut 21. This increases the operating space during minimally invasive spinal surgery, making it easier for the user to treat lesions. This invention is simple to operate, has a simple structure, and causes minimal trauma, making it suitable for orthopedic clinical applications.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A minimally invasive interbody fusion device for the spine, characterized in that, It includes a housing (1), a telescopic part (2) and an adjustment part (3). The adjustment part (3) is disposed inside the housing (1), and the housing (1) is connected to the adjustment part (3) through the telescopic part (2). In use, the telescopic part (2) is extended or retracted by rotating the adjustment part (3).

2. The minimally invasive interbody fusion device for the spine according to claim 1, characterized in that, The minimally invasive intervertebral fusion device also includes a support part (4), which is disposed inside the housing (1) and is connected to the adjustment part (3) through the telescopic part (2). In use, the telescopic part (2) is extended or retracted by rotating the adjustment part (3), thereby causing the housing (1) and the support part (4) to expand or contract.

3. The minimally invasive interbody fusion device for the spine according to claim 2, characterized in that, The adjusting part (3) includes a threaded rod (31) that passes through the housing (1) and the support part (4). The telescopic part (2) is located at the position where the threaded rod (31) connects with the housing (1) and the support part (4).

4. The minimally invasive interbody fusion device for the spine according to claim 3, characterized in that, The telescopic part (2) is a telescopic nut (21), and the threaded rod (31) is provided with a thread that mates with the telescopic nut (21).

5. The minimally invasive interbody fusion device for the spine according to claim 4, characterized in that, The number of telescopic nuts (21) and the number of threaded rods (31) connected to the housing (1) and the support (4) respectively correspond to each other.

6. The minimally invasive interbody fusion device for the spine according to claim 3, characterized in that, The adjustment part (3) further includes an adjustment rod (32), which is connected to the end of the threaded rod (31) to drive the threaded rod (31) to rotate.

7. The minimally invasive interbody fusion device for the spine according to claim 6, characterized in that, An interface (33) is provided at the connection between the threaded rod (31) and the adjusting rod (32). An internal thread is provided on the inner wall of the interface (33), and an external thread is provided at the end of the adjusting rod (32) to engage with the internal thread.

8. The minimally invasive interbody fusion device for the spine according to claim 6, characterized in that, The diameter of the threaded rod (31) is larger than the diameter of the adjusting rod (32).

9. A minimally invasive interbody fusion device for the spine according to claim 8, characterized in that, Both the threaded rod (31) and the adjusting rod (32) are hollow structures. After the threaded rod (31) and the adjusting rod (32) are connected, the hollow structure forms a channel (34) for passing through surgical instruments.

10. A minimally invasive interbody fusion device for the spine according to claim 2, characterized in that, The shell (1) is provided with a plurality of bone graft holes (11), and the surface of the shell (1) is provided with an anti-slip layer (12).

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