Expansion type interbody fusion cage applied to minimally invasive spine surgery

Abstract

The invention belongs to the field of interbody fusion cages in medical instruments, and particularly discloses an expansion type interbody fusion cage applied to minimally invasive spine surgery, which comprises a front-end extrusion block, an internal thread column is connected to the rear part of the front-end extrusion block, and the upper and lower surfaces of the front-end extrusion block are in contact with the inner sides of the front ends of an upper support plate and a lower support plate respectively; upper side edge plates are hinged to the two sides of the upper supporting plate, lower side edge plates are hinged to the two sides of the lower supporting plate, a limiting block is installed on the lower supporting plate, a connecting sliding block is installed below the upper supporting plate, and rear end extrusion blocks which are the same as the front end extrusion blocks in shape and symmetrical in position are installed on the inner sides of the rear ends of the upper supporting plate and the lower supporting plate. An adjusting hole is formed in the center of the rear end extrusion block, a hexagon socket screw is installed in the adjusting hole, a sliding hole is formed in the upper supporting plate, and an oblique nail is installed in the sliding hole. The contact area between the fusion cage and the intervertebral space can be increased, the stability of the fusion cage is improved, and the purposes of recovering the intervertebral space height and expanding the intervertebral foramen are achieved.

Description

Technical Field

[0001] The invention belongs to the field of intervertebral fusion devices in medical devices, and in particular relates to an expandable intervertebral fusion device used in minimally invasive spinal surgery. Background Art

[0002] Fusion is currently used for a small number of functional disorders caused by intervertebral disc herniation or spinal stenosis without spondylolisthesis and spinal degeneration. It is to make the original spinal segment immobile and grow into a whole. Minimally invasive spinal surgery means avoiding large incisions under certain medical risks, using tiny incisions or puncture channels, using special instruments and devices, and reaching the lesion from the normal anatomical structure under the monitoring of imaging instruments or under the guidance of navigation technology. Various miniature manual or electric instruments and equipment are used to complete the entire surgical process under visual conditions.

[0003] Intervertebral fusion can effectively solve cervical and lumbar intervertebral stenosis, degenerative diseases, etc. by implanting a fusion device. Its design concept is: implant a fixed intervertebral fusion device in the original intervertebral space, support it through the fusion device, restore the intervertebral space height, expand the intervertebral foramen, relieve nerve compression symptoms, enhance segment stability, and avoid secondary degeneration of adjacent segments.

[0004] The intervertebral fusion devices used in minimally invasive spinal surgery are rectangular box-shaped, kidney-shaped, bullet-shaped, etc. In the prior art, expandable devices are mostly used, which can be adjusted to expand and expand the intervertebral foramen after the fusion device reaches the patient's spine. In minimally invasive spinal surgery, the intervertebral fusion device is implanted into the patient's spine through a minimally invasive puncture channel. Therefore, the diameter of the minimally invasive puncture channel limits the size of the intervertebral fusion device, and the contact area between the intervertebral fusion device and the spine is insufficient, which will reduce the effect of the intervertebral fusion device after implantation. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes an expandable intervertebral fusion device for minimally invasive spinal surgery. The fusion device is implanted into the patient's lumbar intervertebral space through a minimally invasive incision or puncture channel, and adjusted with hexagon socket bolts, the extrusion blocks at the front and rear ends are tightened to squeeze the upper and lower support plates to expand them, and at the same time, the side plates hinged on the side will unfold under the action of the extrusion blocks until they are parallel to the support plates, increasing the contact area between the fusion device and the spine, and cooperating with the fusion teeth installed on the surface of the support plate and the surface of the side plates, the fusion device is fixed in the patient's intervertebral space, and the patient's intervertebral foramen is enlarged and restored. At the same time, the rear end extrusion block pushes the oblique nail into the patient's spine to further fix the fusion device.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention is as follows: an expandable intervertebral fusion device used in minimally invasive spinal surgery, comprising a front end extrusion block;

[0007] The rear of the front end extrusion block is connected with an internal threaded column, and the upper and lower surfaces of the front end extrusion block are in contact with the front end inner sides of the upper support plate and the lower support plate respectively, and the upper side plates are hinged on both sides of the upper support plate, and the lower side plates are hinged on both sides of the lower support plate. The upper side plates and the lower side plates can just cover the front end extrusion block inwardly, and the lower support plate is provided with symmetrical limit blocks with U-shaped grooves, and symmetrical connecting sliders are installed under the upper support plate, and the connecting sliders can slide in the U-shaped grooves of the limit blocks, and the upper support plate and the lower support plate are connected. A rear end extrusion block with the same shape and position as the front end extrusion block is installed on the inner side of the rear end of the support plate, and an adjustment hole concentric with the extension hole is opened at the center of the rear end extrusion block, and a hexagonal adjusting bolt matching the internal threaded column is installed in the adjusting hole, and the threaded end of the hexagonal adjusting bolt is connected to the internal threaded column, and the diameter of the other end is larger than the inner diameter of the adjusting hole, so that the hexagonal adjusting bolt can drive the rear end extrusion block to move when moving toward the front end; a sliding hole is opened on the upper support plate, and an oblique nail is installed in the sliding hole.

[0008] Preferably, the front end extrusion block is provided with an extended hole coaxial with the internal thread column, the hole diameter of which is larger than the inner diameter of the internal thread column, so as to facilitate the adjustment of the hexagon socket bolt after passing through the internal thread column;

[0009] Preferably, the middle section of the front extrusion block is a front inclined surface, which can push the upper side plate to be parallel to the upper support plate after moving and extruding, and the front section of the front extrusion block is a front extrusion surface, which can be extruded upward while keeping the upper side plate parallel to the upper support plate;

[0010] Preferably, the middle section of the rear extrusion block is a rear inclined surface, which can push the lower side plate to be parallel to the lower support plate after moving and extruding, and the rear section of the rear extrusion block is a rear extrusion surface, which can be used to extrude the lower side plate downward while keeping the lower side plate parallel to the lower support plate;

[0011] Preferably, the outer surfaces of the upper support plate and the lower support plate are both equipped with prismatic long fusion teeth, which can be embedded in the surface of the spine to enhance the fusion effect between the support plate and the intervertebral space;

[0012] Preferably, the outer surfaces of the upper side plate and the lower side plate are both equipped with short fusion teeth of the same shape as the long fusion teeth to strengthen the embedding of the side plates between the vertebrae;

[0013] Preferably, the sliding hole passes through the upper support plate and is slanted toward the front end;

[0014] Preferably, the upper end of the oblique nail is flush with the top of the upper support plate and a plurality of anti-slip teeth are provided on both sides, and the lower end of the oblique nail extends out of the sliding hole and contacts with the rear end extrusion block;

[0015] Preferably, the distance between the connecting sliders is equal to the outer diameter of the internal thread column, and when the front end extrusion block and the rear end extrusion block are close to each other, the internal thread column can prevent the upper support plate and the lower support plate from being misaligned in the horizontal direction.

[0016] Beneficial effects of the present invention:

[0017] 1. When performing intervertebral fusion on a patient, the device can be implanted into the patient's spinal space through a minimally invasive incision or puncture channel. The front extrusion block and the rear extrusion block can be controlled to move toward the center by adjusting the hexagon socket bolt. The upper side plate and the lower side panel on the side are first opened outward to increase the contact area between the fusion device and the intervertebral space, and the upper support plate and the lower support plate are opened from the middle to achieve the purpose of restoring the intervertebral space height and expanding the intervertebral foramen;

[0018] 2. When the rear extrusion block moves toward the center, it will push the oblique nail along the sliding hole toward the spine, and then be nailed into the spine, which can improve the stability of the intervertebral fusion device, and will not slide out after being embedded in the spine under the action of the anti-slip teeth, further improving the stability and safety of the intervertebral fusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings required to describe the embodiment.

[0020] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0021] Figure 2 is a structural explosion diagram of Embodiment 1 of the present invention;

[0022] Figure 3 is a cross-sectional schematic diagram of embodiment 1 of the present invention;

[0023] Figure 4 is an isometric cross-sectional schematic diagram of embodiment 1 of the present invention;

[0024] Figure 5 is a schematic diagram of the overall structure after expansion in Example 1 of the present invention;

[0025] Figure 6 is a cross-sectional schematic diagram after expansion in Example 1 of the present invention;

[0026] Figure 7 is an isometric cross-sectional schematic diagram after expansion in Example 1 of the present invention,

[0027] The structural names represented by the reference numerals in the accompanying drawings are:

[0028] 1-front end extrusion block, 101-front side inclined surface, 102-front extrusion surface, 103-extension hole, 2-upper support plate, 201-sliding hole, 3-upper side plate, 4-lower support plate, 5-lower side plate, 6-rear end extrusion block, 601-rear side inclined surface, 602-rear extrusion surface, 603-adjustment hole, 7-oblique nail, 701-anti-slip teeth, 8-internal thread column, 9-hexagon socket bolt, 10-connecting slider, 11-limiting block, 12-long fusion teeth, 13-short fusion teeth. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0030] Example 1

[0031] According to the technical solution of the present invention, refer to Figures 1 to 7 As shown, an expandable intervertebral fusion device used in minimally invasive spinal surgery is proposed, including a front end extrusion block 1;

[0032] An internal threaded column 8 is connected to the rear of the front end extrusion block 1, and the upper and lower surfaces of the front end extrusion block 1 are in contact with the inner sides of the front ends of the upper support plate 2 and the lower support plate 4 respectively. The upper side panels 3 are hinged on both sides of the upper support plate 2, and the lower side panels 5 are hinged on both sides of the lower support plate 4. The upper side panels 3 and the lower side panels 5 can be inwardly moved so that the front end extrusion block 1 can just cover the lower support plate 4. A symmetrical U-shaped groove-shaped limit block 11 is installed on the lower support plate 4. A symmetrical connecting slider 10 is installed under the upper support plate 2. The connecting slider 10 can slide in the U-shaped groove of the limit block 11. The distance between the connecting sliders 10 is equal to the outer diameter of the internal threaded column 8. When the front end extrusion block 1 is close to the rear end extrusion block 6, the internal threaded column 8 can prevent the upper support plate 2 and the lower support plate 4 from being misaligned in the horizontal direction.

[0033] A rear end extrusion block 6 having the same shape and position as the front end extrusion block 1 is installed on the inner side of the rear ends of the upper support plate 2 and the lower support plate 4. An adjustment hole 603 concentric with the extension hole 103 is opened at the center of the rear end extrusion block 6. A hexagon socket adjustment bolt that fits the internal thread column 8 is installed in the adjustment hole 603. The threaded end of the hexagon socket adjustment bolt is connected to the internal thread column 8, and the diameter of the other end is larger than the inner diameter of the adjustment hole 603, so that the hexagon socket bolt 9 can drive the rear end extrusion block 6 to move when moving toward the front end. An extension hole 103 coaxial with the internal thread column 8 is opened on the front end extrusion block 1, and the hole diameter is larger than the inner diameter of the internal thread column 8, so that the front end of the hexagon socket bolt 9 passes through the internal thread column 8 and then enters the extension hole 103;

[0034] The outer surfaces of the upper support plate 2 and the lower support plate 4 are both installed with prismatic long fusion teeth 12, and the outer surfaces of the upper side plate 3 and the lower side plate 5 are both installed with short fusion teeth 13 of the same shape as the long fusion teeth 12, which can be embedded in the surface of the spine to strengthen the fusion between the fusion device and the intervertebral space;

[0035] A sliding hole 201 is provided on the upper support plate 2, and the sliding hole 201 passes through the upper support plate 2 and is inclined toward the front end. An oblique nail 7 is installed in the sliding hole 201. The upper end of the oblique nail 7 is flush with the top of the upper support plate 2 and a plurality of anti-slip teeth 701 are provided on both sides. The lower end of the oblique nail 7 extends from the sliding hole 201 and contacts with the front end face of the rear end extrusion block 6.

[0036] When performing intervertebral fusion on a patient, the device is implanted into the patient's intervertebral space through a minimally invasive incision or puncture channel. When the device reaches the appropriate position, a special hexagonal screwdriver is used to adjust it. The hexagonal screwdriver is used to tighten the hexagonal bolt 9. With the cooperation of the hexagonal screw 9 and the internal threaded column 8, the front extrusion block and the rear extrusion block 6 are brought closer to the middle. At this time, the front inclined surface 101 and the rear inclined surface 601 squeeze the upper side plate 3 and the lower side plate 5 at the same time, which will push the upper side plate 3 upward and the lower side plate 5 downward until they are parallel to the upper support plate 2 and the lower support plate 4. When the rear end extrusion block 6 moves forward, it will push the oblique nail 7, so that the oblique nail 7 slides along the sliding hole 201 and is nailed into the vertebral surface in contact with the upper side, and is fixed in the spine under the action of the anti-slip teeth 701;

[0037] At this time, continue to tighten the hexagon socket bolt 9, and then the front extrusion surface 102 and the rear extrusion surface 602 will contact and squeeze the upper support plate 2, the upper side plate 3, the lower support plate 4 and the lower side plate 5 at the same time. After the patient's intervertebral foramen is enlarged and restored, the hexagon socket screwdriver can be withdrawn to complete the spinal intervertebral fusion.

[0038] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiment does not describe all the details in detail, nor does it limit the invention to the specific implementation method described. Obviously, according to the content of this specification, many modifications and changes can be made without departing from the present invention.

Claims

1. An expandable intervertebral fusion device used in minimally invasive spinal surgery, characterized in that: Includes front extrusion block (1): The rear of the front extrusion block (1) is connected with an internal thread column (8), and the upper and lower surfaces of the front extrusion block (1) are respectively in contact with the inner sides of the front ends of the upper support plate (2) and the lower support plate (4), and the upper side plates (3) are hinged on both sides of the upper support plate (2), and the lower side plates (5) are hinged on both sides of the lower support plate (4). The lower support plate (4) is provided with a left-right symmetrical U-shaped groove limiting block (11), and the upper support plate (2) is provided with a left-right symmetrical connecting slider (10). A rear end extrusion block (6) having the same shape and position as the front end extrusion block (1) is installed on the inner side of the rear end of the support plate (4); an adjustment hole (603) concentric with the extension hole (103) is provided at the center of the rear end extrusion block (6); a hexagon socket bolt (9) matched with the internal thread column (8) is installed in the adjustment hole (603); the threaded end of the hexagon socket bolt (9) is connected to the internal thread column (8); a sliding hole (201) is provided on the upper support plate (2); an oblique nail (7) is installed in the sliding hole (201).

2. The expandable intervertebral fusion cage for minimally invasive spinal surgery according to claim 1, characterized in that: The front end extrusion block (1) is provided with an elongated hole (103) coaxial with the internal thread column (8), the hole diameter of which is larger than the inner diameter of the internal thread column (8); the front end of the hexagon socket bolt (9) passes through the internal thread column (8) and then enters the elongated hole (103).

3. The expandable intervertebral fusion cage for minimally invasive spinal surgery according to claim 1, characterized in that: The sliding hole (201) passes through the upper supporting plate (2) and is slanted toward the front end.

4. The expandable intervertebral fusion cage for minimally invasive spinal surgery according to claim 1, characterized in that: The distance between the connecting slide blocks (10) is equal to the outer diameter of the internal thread column (8).

5. The expandable intervertebral fusion cage for minimally invasive spinal surgery according to claim 1, characterized in that: The outer surfaces of the upper support plate (2) and the lower support plate (4) are both provided with prismatic long fusion teeth (12).

6. The expandable intervertebral fusion cage for minimally invasive spinal surgery according to claim 5, characterized in that: The outer surfaces of the upper side plate (3) and the lower side plate (5) are both provided with short fusion teeth (13) having the same shape as the long fusion teeth (12).

7. The expandable intervertebral fusion cage for minimally invasive spinal surgery according to claim 6, characterized in that: The upper end of the oblique nail (7) is flush with the top of the upper support plate (2) and is provided with a plurality of anti-slip teeth (701) on both sides. The lower end of the oblique nail (7) extends out from the sliding hole (201) and contacts the rear end extrusion block (6).

8. The expandable intervertebral fusion cage for minimally invasive spinal surgery according to claim 7, characterized in that: The diameter of the rear end of the hexagon socket bolt (9) is greater than the diameter of the adjustment hole (603) of the rear end extrusion block (6).

Images