CN217430268U

CN217430268U - Fusion cage

Info

Publication number: CN217430268U
Application number: CN202221109765.5U
Authority: CN
Inventors: 李亚奇; 徐文利; 陈圣
Original assignee: Suzhou Minimally Invasive Spinal Trauma Medical Technology Co ltd
Current assignee: Suzhou Minimally Invasive Spinal Trauma Medical Technology Co ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-09-16
Anticipated expiration: 2032-05-10

Abstract

The utility model relates to a fuse ware has first contact surface and second contact surface and the first side and the second side that are parallel to each other, first side and second side are located between first contact surface and the second contact surface, and all perpendicular with first contact surface, fuse the inside cavity that is used for holding the bone grafting piece that is equipped with of ware, the cavity runs through first contact surface and second contact surface, the plane at first contact surface place and the plane at second contact surface place are the acute angle setting, and make and fuse the ware and be the taper along length direction. The utility model discloses a fuse ware is formed with the convex angle before, more accords with backbone physiology and dissects, can promote to fuse to resume lumbar vertebrae lordosis, and first side and second side are parallel to each other, thereby can implant the fuse ware with first side and second side level, do not exist because of the convex angle before setting up and lead to the problem that the fuse ware implanted the difficulty.

Description

Fusion cage

Technical Field

The utility model relates to an orthopedics medical treatment technical field especially relates to a fuse ware.

Background

Compared with the traditional PLIF (Posterior lumbar interbody fusion), the TLIF (transforminal lumbar interbody fusion) can avoid or reduce the traction to nerve roots, dura mater and spinal cones in the operation as much as possible, so that the occurrence of nerve injury or cerebrospinal fluid leakage can be avoided. Furthermore, TLIF has much less effect on spinal stability than PLIF due to the simple removal of only one facet joint.

In general, the traditional arc-shaped PLIF fusion cage is directly used in TLIF operation, and the fusion cage is arc-shaped in the sagittal plane and has no lordosis for facilitating the implantation, so that the lumbar lordosis cannot be well recovered. The anterior convex PLIF fusion cage is inconvenient to implant due to the existence of the anterior convex angle, the anterior convex angle is designed according to the PLIF operation type, and when the anterior convex fusion cage is used for the TLIF operation type, the anterior convex shape is not in the sagittal plane, and the lordosis of the vertebral body cannot be well recovered.

SUMMERY OF THE UTILITY MODEL

Based on the above, a fusion device is provided to solve the problems that the lumbar lordosis cannot be recovered and the traditional arc PLIF fusion device and the anterior convex PLIF fusion device are difficult to implant when being used for TLIF operation.

The utility model provides a fuse ware, fuse ware has first side and the second side that first contact surface and second contact surface and be parallel to each other, first side with the second side is located first contact surface with between the second contact surface, and all with first contact surface is perpendicular, fuse the inside cavity that is used for holding the bone grafting piece that is equipped with of ware, the cavity runs through first contact surface with the second contact surface, the plane at first contact surface place with the plane at second contact surface place is the acute angle setting, and makes fuse ware is the taper along length direction.

In one embodiment, the width of the cage is less than the height of the cage.

In one embodiment, a first inclined chamfer is arranged at the joint of the first contact surface and the second side surface, and a second inclined chamfer is arranged at the joint of the second contact surface and the first side surface.

In one embodiment, the included angle between the first contact surface and the second contact surface is 4 degrees to 10 degrees.

In one embodiment, the included angle between the first contact surface and the second contact surface is 7 degrees.

In one embodiment, the first contact surface and the second contact surface are provided with teeth.

In one embodiment, the extending direction of the top end of the tooth forms an angle of 30-60 degrees with the length direction of the fusion device.

In one embodiment, the height of the cage is 7mm to 17 mm.

In one embodiment, the length of the cage is 25mm to 36 mm.

In one embodiment, the fuser is provided with a developing member made of metal.

According to the fusion cage, the included angle between the first contact surface and the second contact surface forms the forward convex angle, the physiological anatomy of the spine is better met, the fusion can be promoted, the lumbar lordosis is recovered, the backward movement of the fusion cage and the bone grafting block is effectively avoided, and the first side surface and the second side surface are parallel to each other, so that the fusion cage can be horizontally implanted into the first side surface and the second side surface, and the problem that the fusion cage is difficult to implant due to the arrangement of the forward convex angle does not exist.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, drawings of other embodiments can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a fusion cage according to an embodiment of the present invention;

FIG. 2 is a side view of one embodiment of a cage;

FIG. 3 is a schematic top view of an embodiment of a cage;

FIG. 4 is a schematic cross-sectional view of the fusion cage shown in FIG. 3 taken along line I-I;

fig. 5 is a perspective view of another embodiment of the fusion cage.

Reference numerals:

10. a fusion device; 10a, a first contact surface; 10b, a second contact surface; 10c, a first side; 10d, a second side; 10e (10f), end faces; 11. a cavity; 12. a developing member; 13. teeth; 14. a first oblique chamfer; 15. a second oblique chamfer; α, forward lobe.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for illustrative purposes only and do not denote a single embodiment.

It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

In an embodiment of the present invention, the sagittal plane is an anatomical term. The human body is cut into two symmetrical parts, the left and right section is the sagittal plane.

Referring to fig. 1 and 2, a fusion cage 10 according to an embodiment of the present invention may be used for lumbar interbody fusion via intervertebral foramen.

Specifically, the main body of the fusion cage 10 is a block-shaped member of an integral structure, the fusion cage 10 has a first contact surface 10a and a second contact surface 10b, a cavity 11 for accommodating a bone graft is arranged in the fusion cage, and the cavity 11 penetrates through the first contact surface 10a and the second contact surface 10 b.

It should be noted that the first contact surface 10a and the second contact surface 10b are the surfaces that contact the vertebral endplates after the fusion cage 10 is implanted. That is, when the fusion cage 10 is implanted in the lumbar spine, the first contact surface 10a and the second contact surface 10b contact vertebral endplates located on opposite sides of the fusion cage 10 to perform rehabilitation therapy on the lumbar spine.

Specifically, the plane of the first contact surface 10a and the plane of the second contact surface 10b are disposed at an acute angle, and the fusion cage 10 is tapered in the longitudinal direction. In this embodiment, the angle between the plane of the first contact surface 10a and the plane of the second contact surface 10b forms the lordotic angle α, so that when the first contact surface 10a and the second contact surface 10b contact vertebral endplates located on opposite sides of the fusion cage 10, the vertebral endplates restore lordosis to the fusion cage 10. Therefore, the structure is more suitable for the physiological anatomy of the spine, and can promote the fusion to recover the lumbar lordosis and effectively avoid the backward movement of the fusion device 10 and the bone graft.

The lengthwise direction of the fusion cage 10 refers to the direction in which the maximum extension of the fusion cage 10 is determined. Taking the shape of the fusion cage 10 as a cuboid as an example, the length direction of the fusion cage 10 is the direction for determining the length of the cuboid.

It should be noted that, after the fusion cage 10 is implanted, the plane of the first contact surface 10a and the plane of the second contact surface 10b are both perpendicular to the sagittal plane, so as to precisely adjust the angle of the lumbar lordosis by using the anterior convex angle α, which is beneficial to improving the lumbar lordosis recovery effect.

As shown in fig. 1 and 3, the fusion cage 10 has a first side surface 10c and a second side surface 10d parallel to each other, and the first side surface 10c and the second side surface 10d are located between the first contact surface 10a and the second contact surface 10b and are perpendicular to the first contact surface 10 a. With this arrangement, and with reference to the first lateral side 10c of the fusion device 10, assuming that the fusion device 10 is implanted with the first lateral side 10c perpendicular to the sagittal plane, it is only necessary to rotate the fusion device 10 by 90 degrees after implantation of the fusion device 10 so that the first and second

lateral sides

10c, 10d are parallel to the sagittal plane, with both the first and

second contact surfaces

10a, 10b perpendicular to the sagittal plane, to provide precise adjustment of the angle of lordosis of the lumbar spine using the anterior lobe α.

In this embodiment, since the first side 10c and the second side 10d are parallel to each other, the fusion cage 10 is horizontally implanted with the first side 10c and the second side 10d, so that there is no problem in that the implantation of the fusion cage 10 is difficult due to the provision of the front convex angle α. Moreover, after the fusion cage 10 is implanted in place, the first contact surface 10a and the second contact surface 10b can be contacted with the vertebral body end plate only by rotating 90 degrees, so that the lumbar lordosis is restored by the anterior convex angle alpha, and the operation is simple and convenient.

Further, the value range of the anterior convex angle α is 4 degrees to 10 degrees, for example, the anterior convex angle α is 4 degrees, 6 degrees, 7 degrees, 9 degrees or 10 degrees, so as to adapt to the recovery requirements of different lumbar lordosis.

Referring to fig. 4, a first inclined chamfer 14 is provided at the junction of the first contact surface 10a and the second side surface 10d, and a second inclined chamfer 15 is provided at the junction of the second contact surface 10b and the first side surface 10 c. The first and second

angled chamfers

14, 15 allow the cage 10 to be easily rotated 90 degrees after implantation to bring the first and

second contact surfaces

10a, 10b into contact with the vertebral endplates.

In some embodiments, the junction between the first contact surface 10a and the first side surface 10c is provided with a third inclined chamfer, and the junction between the second contact surface 10b and the second side surface 10d is provided with a fourth inclined chamfer, so that the third inclined chamfer and the fourth inclined chamfer can be used to improve the convenience of the rotating operation of the fusion device 10 after the fusion device 10 is implanted.

To further illustrate the construction of the cage 10, the height, length and width of the cage 10 are defined below, respectively.

Specifically, the height of the fusion cage 10 refers to the height of the position with the largest height in the height direction, the length of the fusion cage 10 is the distance between two

end surfaces

10e and 10f of the fusion cage 10 perpendicular to the length direction, and the width of the fusion cage 10 is the distance between a first side surface 10c and a second side surface 10d of the fusion cage 10 perpendicular to the width direction, wherein the height direction (see the Z-axis direction in fig. 1), the length direction (see the X-axis direction in fig. 1), and the width direction (see the Y-axis direction in fig. 1) of the fusion cage 10 are perpendicular to each other.

The width of the fusion cage 10 is smaller than the height of the fusion cage 10, so that when the fusion cage 10 is implanted horizontally, the smaller-sized width facilitates the implantation of the fusion cage 10.

It should be noted that the fusion cage 10 can be made in a variety of sizes to suit the needs of different patients. In some embodiments, the height of the fusion cage 10 is 7mm to 17mm, such as 7mm, 9mm, 10mm, 13mm, 15mm or 17mm for the height of the fusion cage 10, and the length of the fusion cage 10 is 25mm to 36mm, such as 25mm, 26mm, 28mm, 30mm, 33mm or 36mm for the length of the fusion cage 10.

Referring again to fig. 1, in some embodiments, the cage 10 is provided with a metallic visualization member 12 so that the implantation location of the cage 10 can be accurately known during and after implantation using the visualization member 12. The developing member 12 may be a developing needle or a developing ring, and is not limited thereto.

The developing member 12 may be plural, and in the case where the developing member 12 is a developing needle, the developing needles are provided at both ends of the fuser 10 in the longitudinal direction, and penetrate from the first contact surface 10a to the second contact surface 10b of the fuser 10.

In some embodiments, the first and

second contact surfaces

10a, 10b of the cage 10 are provided with teeth 13 to facilitate improved stability of the cage 10 after implantation.

The shape of the teeth 13 may be a saw tooth (barb type teeth) or a wave type teeth, and the shape of the teeth 13 is not limited herein.

The direction of extension of the tips of the teeth 13 is at an angle of 30 to 60 degrees to the length of the cage 10. With this arrangement, the teeth 13 are inclined at a suitable angle relative to the fusion cage 10 to facilitate rotational manipulation of the fusion cage 10 after implantation and to ensure implantation stability of the fusion cage 10.

It should be noted that, in some embodiments, as shown in fig. 5, the extending direction of the tip of the tooth 13 may be perpendicular to the longitudinal direction of the fusion cage 10.

In some embodiments, the fusion device 10 is made of a metal material such as medical stainless steel, titanium alloy, or cobalt-chromium-molybdenum alloy.

It should be noted that, in the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The fusion cage is characterized in that the fusion cage is provided with a first contact surface, a second contact surface, a first side surface and a second side surface which are parallel to each other, the first side surface and the second side surface are located between the first contact surface and the second contact surface and are perpendicular to the first contact surface, a cavity for accommodating a bone grafting block is arranged inside the fusion cage, the cavity penetrates through the first contact surface and the second contact surface, and the plane where the first contact surface is located and the plane where the second contact surface is located are arranged in an acute angle mode, so that the fusion cage is tapered along the length direction.

2. The cage of claim 1, wherein the cage has a width that is less than a height of the cage.

3. The fusion device defined in claim 1 wherein a first angled chamfer is provided at the junction of the first contact surface and the second side surface and a second angled chamfer is provided at the junction of the second contact surface and the first side surface.

4. The fusion device defined in claim 1 wherein the angle between the first and second contact surfaces is between 4 and 10 degrees.

5. The fusion device defined in claim 4 wherein the angle between the first and second contact surfaces is 7 degrees.

6. The fusion device defined in claim 1 wherein the first and second contact surfaces are provided with teeth.

7. The fusion device defined in claim 6 wherein the tips of the teeth extend at an angle of 30 to 60 degrees to the length of the fusion device.

8. A fusion cage according to claim 1, wherein the height of the cage is 7mm-17 mm.

9. The fusion cage of claim 1, wherein the cage has a length of 25mm-36 mm.

10. A fusion device according to claim 1, wherein the fusion device is provided with a metallic developing member.