CN109157311B - A minimally invasive implantable shape memory interbody cage - Google Patents

Abstract

The application of the present invention is a divisional application of 201410358699.9, and the present invention relates to a minimally invasive implanted shape memory interbody fusion cage for spinal surgery. The minimally invasive implanted shape memory intervertebral cage is a frame-type hollow structure, which consists of several column shafts, main beams, side beams, memory deformation side beams, memory deformation main beams, several shaft rings and an open window. The front beam, the side beam, the memory deformation side beam, and the memory deformation front beam are connected to each other through the groove structure, the convex head structure and the shaft peripheral ring, and the shaft peripheral rings of different levels are sleeved on the column shaft correspondingly. Among them, the memory deformation side beam and the memory deformation main beam are made of medical titanium-nickel memory alloy with shape memory function. The invention can enter the intervertebral space through the current tiny channel, not only has the advantages of less trauma, less pain, quick recovery, less complications, etc., but also can increase the contact area with the upper and lower endplates of the vertebral body after being stretched, and more implantation Bone, improve fusion rate.

Description

A minimally invasive implantable shape memory interbody cage

The patent application of the present invention is a divisional application, the application number of the original case is: 201410358699.9, the application date is: July 27, 2014, and the name of the invention is: a minimally invasive implanted shape memory interbody fusion device.

technical field

The invention relates to a minimally invasive inserting shape memory intervertebral fusion cage used in the medical field and spine surgery.

Background technique

Cervical disc herniation, cervical spinal stenosis, cervical segmental instability, thoracic disc herniation, lumbar disc herniation, lumbar spinal stenosis, lumbar segmental instability, lumbar spondylolisthesis and other diseases caused by spinal degeneration very common. Lumbar interbody fusion has a definite curative effect and has been used for over a hundred years.

Interbody fusion includes anterior interbody fusion, posterior interbody fusion, transforaminal lumbar interbody fusion, and lateral lumbar interbody fusion.

Anterior intervertebral fusion can enter the intervertebral space from the front, which can spread and restore the height of the intervertebral space more effectively. At the same time, the anterior approach can more thoroughly remove the degenerated intervertebral disc, and ALIF does not need to pull the dural sac and nerve root, so Damage to nerve roots and dural sac is avoided. In addition, ALIF also protects the integrity of the posterior structures of the lumbar spine, such as the lamina and facet joints. The anterior approach of cervical spine surgery is common, but the anterior approach of lumbar spine surgery damages the great blood vessels and sympathetic plexus, leading to complications such as retrograde ejaculation and urinary disturbance.

Posterior lumbar interbody fusion is to complete intervertebral fusion through the posterior spinal canal to obtain the stability of the anterior and central lumbar spine. Transforaminal lumbar interbody fusion is to enter the lumbar intervertebral space from a unilateral foraminal approach. Complete a series of procedures such as intervertebral discectomy, bone grafting, and interbody cage implantation, and can also provide bilateral anterior and central column support for the lumbar vertebrae. With the addition of posterolateral bone grafting and strong internal fixation, peripheral fusion of the lumbar vertebrae can also be obtained. . Lateral lumbar interbody fusion is an operation that separates the muscles laterally to the side of the lumbar spine and performs decompression and fusion.

Various surgical methods are open surgery, with larger trauma and more complications; with the rapid development of high-precision medical surgical instrument technology, digital imaging technology and computer intelligent technology, the concept of minimally invasive surgery is constantly being adopted by surgeons. Recognized and accepted, minimally invasive surgical methods with many advantages such as less trauma, less pain, faster recovery, and fewer complications are constantly explored by surgery.

Such as small incision combined with special endoscopic retractor or video endoscope-assisted anterior interbody fusion, lateral interbody fusion, posterior endoscopic-assisted posterior spinal fusion, transforaminal lumbar spine Interbody fusion.

Foreign Grob et al. used two oblique screws to perform lumbar fusion (Direct pediculo-body fixation) for patients with an anterior displacement of the upper vertebral body greater than 25% and a disc space height of less than 75%. Birkenmaier et al. The indication for this operation, and this operation is carried out under navigation, is named: Guided Oblique Lumbar Interbody Fusion (GO-LIF).

These minimally invasive procedures all have the advantages of less trauma, less pain, faster recovery, and fewer complications.

However, the traditional cage cannot be used due to the smaller incision, and a new type of small cage is needed. However, if the size of the cage is too small, the contact area with the upper and lower endplates will become smaller, and the ideal cage cannot be achieved. Intervertebral fusion, resulting in a failed operation.

With the improvement of intervertebral cages, expandable intervertebral cages (such as B-twin products, Disc-O-tech Medical Technologies, Ltd. Israel) have been reported, which can be implanted percutaneously. Expanded after implantation to achieve the purpose of intervertebral fusion. However, it adopts the mechanical rotation compression method, and the bone graft area in the middle is small, and it only spreads out in a bud shape.

At present, memory alloy technology can achieve the effect of micro-implantation and expansion in the body. The previous published patent (publication number CN1449725A, patent number: 03113393.2) describes a shape memory alloy minimally invasive intervertebral body that is opened by spheronization technology Cage, this technology utilizes the shape memory function of memory alloys, but after being stretched, the upper and lower endplates come out to contact the upper and lower endplates. There is no blocking fence around, and the bone is easy to leak to the surrounding. But shape memory alloys are a major advantage of minimally invasive cages.

SUMMARY OF THE INVENTION

How to insert an intervertebral cage under the minimally invasive channel, so that it can be stretched in the body, and at the same time, bone graft fusion can be performed well. We designed this minimally invasive implantable shape memory cage.

The present invention is achieved through the following technical solutions:

1. The minimally invasive implanted shape memory interbody cage is a frame-type hollow structure, which consists of several column shafts, main beams, side beams, memory deformation side beams, memory deformation main beams, several axial rings and an open window. composition.

2. The front beam, the side beam, the memory deformation side beam, and the memory deformation front beam are provided with a card groove structure or one of the convex head structures at both ends. One of the convex head structures, if the main beam, the side beam, the memory deformation side beam, and the memory deformation main beam are provided with a slot structure, then the 360-degree range of the periphery of the shaft peripheral ring is provided with a convex head structure; if the main beam, The side beams, the memory deformation side beams, and the memory deformation main beams are provided with convex head structures at both ends, and the 360-degree range of the periphery of the shaft ring is provided with a slot structure, that is, the main beam, the side beams, the memory deformation side beams, and the memory deformation main beams. The ends are connected to each other through the groove structure, the convex head structure and the shaft peripheral ring, so that the main beam, the side beam, the memory deformation side beam, and the memory deformation main beam can rotate and move around the periphery of the shaft peripheral ring.

3. Both ends of the front beam are connected to a shaft peripheral ring connected to one end of the side beam.

4. One end of the side beam is connected to a shaft peripheral ring connected to one end of the main beam, and the other end is connected to a shaft peripheral ring connected to the memory deformation side beam and the memory deformation main beam.

5. Both ends of the memory-deformable side beam and the memory-deformation main beam are respectively connected to a shaft peripheral ring connected to one end of the side beam.

6. The shaft peripheral rings at different levels are sleeved on the column shaft corresponding to each other, and can rotate around the column shaft to form the three-dimensional space structure of the present invention.

7. The memory deformation side beam and the memory deformation main beam are made of medical titanium-nickel memory alloy with shape memory function, and their shape changes due to different temperatures, so that after implantation into the human body, it becomes straight at about 37 degrees Celsius , make the whole larger, increase the contact area with the upper and lower endplates of the vertebral body, more implanted bone, and improve the fusion rate.

8. There are open windows on the surface composed of several main beams at different levels, and artificial bone or autologous bone can be inserted into the present invention through the open windows.

9. A part of the front beam and the side beams of the present invention are made of materials that are opaque to X-rays, which can provide a position judgment function for the operation.

The beneficial effects that the present invention can achieve

The minimally invasive implanted shape memory interbody cage has a small volume before deformation, and can enter the intervertebral space through the current tiny channel. Straight, making the whole larger, so as to achieve the purpose, the present invention can meet the requirements of the small channel implantation in combination with the current various minimally invasive interbody fusion.

Therefore, combined with the minimally invasive technology, the present invention not only has the advantages of less trauma, less pain, faster recovery, less complications, etc., but also can increase the contact area with the upper and lower endplates of the vertebral body after being stretched, and more implanted bone, Improve fusion rate.

Description of drawings

Accompanying drawing: Fig. 1: The structural schematic diagram of the present invention before deformation.

Figure 2: Schematic diagram of the deformed structure of the present invention.

Figure 3: A top plan view of the present invention before deformation.

Figure 4: Top view of the present invention after deformation.

FIG. 5 is a schematic cross-sectional view of the slot structure and the protruding head structure of the present invention.

In the figure: 1. Side beam; 2. Shaft ring; 3. Column shaft; 4. Memory deformation side beam; 5. Memory deformation front beam; 6. Front beam; 7. Open window; 8. Protruding head structure; 9 .Card slot structure.

Detailed ways

Example 1:

Anterior spinal fusion, under minimally invasive or open conditions, reaches the front of the spine, confirms the diseased vertebra, re-discs, grinds bone, and fully decompresses. Take an undeformed one of the present invention of a suitable size and place it in the intervertebral space. At this time, the memory deformed side beam 4 and the memory deformed main beam 5 are gradually straightened in the body, and become the appearance in FIG. 2. After confirming that the position is OK, implant artificial bone or autologous bone through a special matching funnel.

Example 2:

Transpedicular and intervertebral disc oblique screw fixation combined with intervertebral cage placement, under endoscopic or open traditional surgical conditions, through the posterior surgical approach or through the transforaminal surgical approach, the intervertebral disc is removed, Grind off the upper and lower endplates, and after the decompression is sufficient, take an undeformed one of the present invention of a suitable size and place it in the intervertebral space. As shown in Figure 2, after confirming the position under the C-arm X-ray machine, artificial bone or autologous bone is implanted through a special matching funnel.

Example 3

Posterior spinal decompression with four screws and two rods and internal fixation combined with intervertebral cage placement, under the condition of endoscopic or open traditional surgery, through the posterior surgical approach or through the transforaminal surgical approach, the intervertebral disc is removed, Grind off the upper and lower endplates, and after the decompression is sufficient, take an undeformed one of the appropriate size and place it in the intervertebral space. As shown in Figure 2, after confirming the position under the C-arm X-ray machine, artificial bone or autologous bone is implanted through a special matching funnel.

Example 4:

Under the condition of endoscopic or open traditional surgery, the intervertebral disc is removed through the lateral lumbar muscle or muscle space approach, and the upper and lower endplates are removed. After sufficient decompression, the appropriate size is selected. The undeformed one of the present invention is placed in the intervertebral space. At this time, the memory deformed side beam 4 and the memory deformed main beam 5 are gradually straightened in the body, becoming the appearance in Figure 2, and the position is confirmed under the C-arm X-ray machine. After that, artificial bone or autologous bone can be implanted through a special matching funnel.

Claims (3)

1. A minimally invasive implantation shape memory interbody fusion cage is characterized in that: the hollow structure is a frame type hollow structure and consists of a plurality of upright post shafts, a front beam, a side beam, a memory deformation front beam, a plurality of shaft peripheral rings and an open window, wherein both ends of the front beam, the side beam, the memory deformation side beam and the memory deformation front beam are respectively provided with a raised head structure, the peripheral 360-degree range of the shaft peripheral rings is provided with a clamping groove structure, both ends of the front beam, the side beam, the memory deformation side beam and the memory deformation front beam are mutually connected with the shaft peripheral rings through the raised head structures and the clamping groove structures, both ends of the front beam are connected with the shaft peripheral rings connected with one end of the side beam, the other end of the side beam is connected with the shaft peripheral rings connected with the memory deformation side beam and the memory deformation front beam, the shaft peripheral rings of different layers are correspondingly sleeved, can rotate around the upright post shaft to form a three-dimensional space structure, and the surface formed by a plurality of front beams with different layers is provided with an open window.

2. The minimally invasive implanting shape memory interbody fusion cage of claim 1, wherein: the memory deformation side beam and the memory deformation front beam are made of medical titanium-nickel memory alloy with a shape memory function.

3. The minimally invasive implanting shape memory interbody fusion cage of claim 1, wherein: the front and side members are made of a material that is opaque to X-rays.

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