Height-adjustable interbody fusion cage for oblique lateral approach

Abstract

Provided is a height-adjustable interbody fusion cage for an oblique lateral approach, comprising a body having a frame structure. A first upper blade is movably disposed on one end surface of the body, and a second lower blade is movably disposed on the end surface of the body opposite to the first upper blade. Opposite side surfaces of the body are provided with positioning holes. The two positioning holes are located on the same straight line in the horizontal direction, and the center lines of the two positioning holes are also on the same straight line. The end surface of the body adjacent to the positioning holes is a threaded end surface, and the threaded end surface is provided with a threaded hole. The surfaces of the first upper blade and the second lower blade are both arranged obliquely to the horizontal line, and the surfaces of the first upper blade and the second lower blade are both disposed at an acute angle to the horizontal line. The fusion cage has a height adjustment function, and can be accurately adjusted after implantation, thereby providing greater surgical operation flexibility and ensuring an optimal implantation position and fusion effect.

Description

A height-adjustable interbody fusion device via oblique lateral approach Technical Field

[0001] This utility model relates to the technical field of fusion devices, and in particular to a height-adjustable intervertebral fusion device with oblique lateral approach. Background Technology

[0002] Currently, in oblique lateral lumbar interbody fusion (OLIF) surgery, a fixed-height fusion cage is used. Numerous trial molds and other surgical tools are required to gradually fit the appropriate height and size before implantation into the intervertebral space. Using traditional fusion cages for surgery has the following problems and disadvantages:

[0003] 1) Multiple adjustments to the patient's intervertebral space size are required to select a fusion device of appropriate height and size, which takes a long time, leading to increased bleeding and pain for the patient.

[0004] 2) Pre-grafting of bone is not possible after implantation. The implanted bone may not fully adhere to the endplate, which may lead to insufficient fusion of bone resorption.

[0005] 3) Conventional fusion devices are made of PEEK material, which cannot be well visualized after implantation, making it impossible to effectively observe the implantation location of the fusion device.

[0006] 4) It is difficult to insert large-sized fusion devices under endoscopic access, making it impossible to perform minimally invasive surgery on fusion devices of all heights.

[0007] Utility Model Content

[0008] To address the shortcomings of existing technologies, the purpose of this invention is to provide a height-adjustable interbody fusion device for the oblique lateral approach, featuring height adjustment capabilities. This allows for precise adjustment after implantation, providing greater surgical flexibility and ensuring optimal implantation location and fusion results. To achieve the above-mentioned objectives and other advantages of this invention, a height-adjustable interbody fusion device for the oblique lateral approach is provided, comprising:

[0009] The main body has a frame structure, with a first upper blade movably disposed on one end face of the main body, and a second lower blade movably disposed on the end face of the main body opposite to the first upper blade;

[0010] Positioning holes are provided on opposite sides of the main body. The two positioning holes are located on the same straight line in the horizontal direction, and the center lines of the two positioning holes are also on the same straight line.

[0011] The end face adjacent to the positioning hole of the main body is a threaded end face, and a threaded hole is provided on the threaded end face;

[0012] The surfaces of the first upper blade and the second lower blade are both inclined to the horizontal line, and the surfaces of the first upper blade and the second lower blade are both set at an acute angle to the horizontal line.

[0013] The surfaces of the first upper blade and the second lower blade are both arc-shaped.

[0014] Preferably, the surfaces of the first upper blade and the second lower blade intersect when they extend, and the angle at the intersection ranges from 6 degrees to 12 degrees.

[0015] Preferably, large bone grafting windows are provided on the surfaces of both the first upper blade and the second lower blade.

[0016] Preferably, the surface of the first upper blade is provided with a uniformly distributed tooth structure.

[0017] Preferably, the surface of the second lower blade is provided with a uniformly distributed transverse straight groove with inverted sharp teeth structure, and the second lower blade is provided with multiple inverted sharp teeth structures between the transverse straight groove with inverted sharp teeth structure.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: The fusion device of this application is suitable for OLIF (Oblique Lateral Interbody Fusion) surgery, bringing significant benefits to doctors and patients. This fusion device has a high degree of adjustability, allowing for precise adjustment after implantation, providing greater surgical flexibility, and ensuring optimal implantation position and fusion effect. Its 33-curve design conforms to the shape of the human intervertebral space, facilitating post-implantation fit and thus improving the success rate of the surgery. The bolt design ensures its strength and stability. The large bone graft window design allows for the implantation of more bone, better promoting bone graft fusion. The expandable modular design allows for re-implantation after implantation, promoting bone fusion and accelerating postoperative recovery for patients.

[0019] The side positioning hole design facilitates X-ray imaging during surgery, improving the accuracy and safety of the procedure. The fully threaded design ensures that any abnormalities during surgery can be addressed when withdrawal is required, guaranteeing patient safety. Furthermore, the curved surface design and anti-retraction teeth of the fusion device further enhance post-implantation stability, improving surgical success rates and patient outcomes. These features and advantages give this invention broad clinical application prospects, providing patients with safer and more effective treatment options, while also offering doctors a more convenient and reliable product, thus promoting the development and progress of spinal surgery. Attached Figure Description

[0020] Figure 1 is a three-dimensional structural schematic diagram of the height-adjustable interbody fusion device with oblique lateral approach according to the present invention.

[0021] Figure 2 is a front view of the threaded end face of the height-adjustable interbody fusion device with oblique lateral approach according to the present invention.

[0022] Figure 3 is a view of the oblique lateral approach height-adjustable interbody fusion device according to the present invention, viewed from the inverted tooth surface. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Referring to Figures 1-3, a height-adjustable interbody fusion device via a lateral approach includes: a main body 3 with a frame structure; a first upper leaf 31 movably disposed on one end face of the main body 3; and a second lower leaf 32 movably disposed on the opposite end face of the main body 3. By vertically moving the first upper leaf 31 and the second lower leaf 32 within the main body 3, the fusion device can be continuously and precisely adjusted after implantation to achieve the optimal implantation position and fusion effect. Furthermore, the first upper leaf 31 and the second lower leaf 32 employ a multi-component combined expansion design, which can create a micro-motion effect, facilitating bone fusion. This technical solution has been disclosed, and the specific structure will not be described in detail here. A bolt 1 is fixedly connected internally to the main body 3. The bolt 1 adopts a reinforced internal perforated drive design, ensuring the strength of the bolt 1 during expansion and increasing the stability of the surgery.

[0025] Positioning holes 5 are respectively provided on opposite sides of the main body 3. The two positioning holes 5 are located on the same straight line in the horizontal direction, and the center lines of the two positioning holes 5 are also on the same straight line. The setting of the two positioning holes 5 makes it convenient to take X-ray films during the operation to observe the accuracy of the implantation position.

[0026] The end face adjacent to the positioning hole 5 of the main body 3 is a threaded end face 33. A threaded hole 34 is provided on the threaded end face 33. The threaded hole 34 adopts a full-turn thread design, which can ensure that it can be used with a threaded tool when it needs to be withdrawn, so as to deal with abnormal situations during surgery.

[0027] The surfaces of both the first upper blade 31 and the second lower blade 32 are inclined to the horizontal line, and both surfaces are set at acute angles to the horizontal line. The inclined and arc-shaped design of the surfaces of the first upper blade 31 and the second lower blade 32 ensures that the unique arc dimensions of the fusion device conform to the shape of the human intervertebral space, with a lateral inclination of 6-12°, which facilitates proper fit after implantation and improves the success rate of the surgery.

[0028] Furthermore, when the surfaces of the first upper blade 31 and the second lower blade 32 extend respectively, they will intersect, with the angle at the intersection ranging from 6 degrees to 12 degrees.

[0029] Furthermore, large bone graft windows are provided on the surfaces of both the first upper blade 31 and the second lower blade 32. These large bone graft windows allow for the implantation of more bone, promoting better bone graft fusion.

[0030] Furthermore, the surface of the first upper blade 31 is provided with evenly distributed tooth-shaped structures. The first upper blade 31 does not have a reverse pointed tooth structure, which is suitable for patients with normal bone.

[0031] Furthermore, the surface of the second lower leaflet 32 ​​is provided with a uniformly distributed transverse straight-lined structure with reversed teeth, and multiple reversed teeth 6 are arranged between the transverse straight-lined structure with reversed teeth on the second lower leaflet 32. This structure further enhances the anti-retraction function after implantation. The surface structures of the first upper leaflet 31 and the second lower leaflet 32 ​​are suitable for different patients, improving the success rate of surgery and the treatment effect of patients, and can be selected according to specific circumstances.

[0032] When using a fusion cage, specific marking is performed as follows: Preoperatively, based on MRI, CT, and other imaging data, the location of the psoas major muscle and its adjacent relationships with the blood vessels and nerves in front and behind it are determined, as well as the location of important organs such as the kidneys. The distance between the left psoas major muscle and the blood vessels is measured. Anesthesia: General anesthesia is selected. Patient positioning: The patient is placed in a right lateral decubitus position with the left side facing upward, the lower limbs slightly bent, and the psoas muscles relaxed. The intervertebral disc space is located and exposed: The location of the intervertebral disc segment is determined using fluoroscopy. A mark is made 6cm anterior to the midpoint of the intervertebral disc. Generally, a 3-6cm surgical incision is made 4-10cm anterior to the midpoint of the target intervertebral disc. After incising the skin, the layers are dissected one by one, and then the external oblique, internal oblique, and transversus abdominis muscles are bluntly dissected to enter the retroperitoneal space. A channel is placed in the anatomical space between the aorta and the psoas major muscle to expose the intervertebral space, and the intervertebral disc is removed and the intervertebral space is treated. Then, the intervertebral fusion cage is placed, ensuring that the cage is properly positioned. Then, using the matching surgical instruments, the quincunx holes of the anterior bolts of the intervertebral fusion cage are inserted and rotated clockwise until it is opened to the required height. Next, bone grafting: depending on the patient's condition, after opening, bone grafts (including autologous bone, allogeneic bone, etc.) are implanted and compacted to promote fusion. Fixation: as needed, the lumbar spine is fixed by percutaneous pedicle screws or other fixation methods to ensure the stability of the fusion cage and the lumbar spine. Suturing: the wound is cleaned, the incision is sutured and closed, a drainage tube is placed, and pressure bandage is applied. During the surgery, an appropriately sized fusion cage is selected and implanted into the intervertebral space. Using X-rays and other auxiliary tools to confirm the correct implantation position, the surgeon adjusts the height using specialized tools. By rotating the bolts in the fusion cage clockwise with a wrench, the height is adjusted to the desired position, ensuring complete contact with the vertebral endplate, as confirmed by X-rays, achieving immediate stability. A large amount of bone graft is then implanted through the posterior port of the fusion cage to ensure it fills the implantation site and remains stable, achieving optimal postoperative fusion. Once the fusion cage is fixed, the surgeon may perform further surgical treatments as needed, such as implanting a rod-and-screw system for fixation or re-implanting bone substitutes. Postoperatively, the surgeon closes the incision and provides appropriate rehabilitation management and patient care.

[0033] By employing the above procedures, doctors can precisely implant and adjust the height-adjustable fusion device to achieve the best implantation position and fusion effect.

[0034] Throughout the procedure, medical staff should closely monitor the patient's vital signs and the condition of the surgical area to ensure a safe and successful operation. After the procedure, appropriate postoperative care and observation are necessary to ensure a good recovery for the patient.

[0035] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications and variations of this utility model will be obvious to those skilled in the art.

[0036] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A height-adjustable interbody fusion device via a lateral approach, characterized in that, include: The main body (3) has a frame structure. A first upper blade (31) is movably disposed on one end face of the main body (3), and a second lower blade (32) is movably disposed on the end face of the main body (3) opposite to the first upper blade (31). Positioning holes (5) are respectively provided on opposite sides of the main body (3). The two positioning holes (5) are located on the same straight line in the horizontal direction, and the center lines of the two positioning holes (5) are also on the same straight line. The end face adjacent to the positioning hole (5) of the main body (3) is a threaded end face (33), and a threaded hole (34) is provided on the threaded end face (33); The surfaces of the first upper blade (31) and the second lower blade (32) are both inclined to the horizontal line, and the surfaces of the first upper blade (31) and the second lower blade (32) are both set at an acute angle to the horizontal line; The surfaces of the first upper blade (31) and the second lower blade (32) are both arc-shaped.

2. The height-adjustable interbody fusion device via a lateral approach as described in claim 1, characterized in that, When the surfaces of the first upper blade (31) and the second lower blade (32) extend respectively, they will intersect, and the angle range of the intersection is 6 degrees to 12 degrees.

3. The height-adjustable interbody fusion device via a lateral approach as described in claim 2, characterized in that, Large bone grafting windows are provided on the surfaces of both the first upper blade (31) and the second lower blade (32).

4. The height-adjustable interbody fusion device via a lateral approach as described in claim 3, characterized in that, The surface of the first upper blade (31) is provided with a uniformly distributed tooth structure.

5. The height-adjustable interbody fusion device via a lateral approach as described in claim 4, characterized in that, The surface of the second lower blade (32) is provided with a uniformly distributed transverse straight groove with inverted tooth structure, and the second lower blade (32) is provided with multiple inverted tooth structures (6) between the transverse straight groove with inverted tooth structure.

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