JP2003024337A - Spacer stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and speedily fix a spacer concerning a hook for fixing a spinous process spacer for keeping expansion to vertically divided spinous processes by inserting the hook into between the spinous processes after vertically cutting and expanding the spinous process by arcus vertebrae forming operation by a vertical dividing method of spinous process of cervical vertebrae, which is the operation method of ossification disease of posterior longitudinal ligament of cervical vertebrae and cervical verbral myelopathy. SOLUTION: In the hook for fixing the spinous process spacer between vertically divided spinous processes, a stator for fixing the hook and the vertically divided spinous processes are positioned between both of them to fix the spinous process spacer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cervical vertebral projection longitudinal split laminoplasty, which is a surgical method for treating cervical posterior longitudinal ligament ossification and cervical spondylotic myelopathy. In this case, the present invention relates to a stator that is inserted between the spinous processes or the like, and a spacer that maintains expansion is fixed between the vertically divided spinous processes. Or, in cervical spinal canal dilatation used when treating cervical spinal canal stenosis or posterior longitudinal ligament ossification, etc. It relates to the stator of the applied spacer.

[0002]

2. Description of the Related Art Conventionally, there are mainly two types of surgical treatment methods for diseases such as ossification of cervical posterior longitudinal ligament and cervical spondylotic myelopathy. There is a cervical spinous process longitudinal laminoplasty. This surgical method is considered to have few complications such as disorders of nerve roots, and is carried out by the inventor.

The operation method is as follows:
A gutter is created in the facet joints and the tip of the spinous process is longitudinally divided. Between the spinous processes that have been longitudinally split and expanded, autologous bones such as bones collected from the iliac bones, excised bones, and excised spinous process tip bones are processed and transplanted, or trapezoidal or arched. The ceramic spacers are sandwiched and fastened with wires, silk thread, synthetic thread, etc. to expand the cervical vertebrae (see Fig. 1 and Fig. 2, from Atsushi Kodachi "Orthopedic Surgery Kurdus"). Quote).

As a result, the pressure exerted on the spinal cord compressed by the narrow spinal canal can be released.

[0005]

The above-mentioned structure of, for example, the conventional ceramic spacer has many advantages over bone graft, but when fixing, a wire, silk thread,
It was necessary to prepare and use synthetic yarn.

Further, it was considered that there is no reliable fixing method other than that method.

Furthermore, since the surgical field is narrow in this type of surgery,
When a spacer is used, it is not easy to pass a wire, a silk thread, or a synthetic thread through a hole of a spinous process that has been vertically split, and further to pass through the spacer, which requires a lot of time and requires skillful work.

Furthermore, when fixing 5 or 6 spacers, the operation requires a considerably long time, which causes a problem of prolonging the operation time and increasing the amount of bleeding.

Further, the wire, silk thread or synthetic thread used for fixation may be cut by the movement of the spacer, and the spacer may fall into the spinal canal.

An object of the present invention is to solve the above-mentioned conventional problems in cervical laminoplasty, etc., to make the fixing quick and easy, to shorten the operation time, and to secure the fixation securely and securely after the fixation. Is to provide a spacer stator having a structure in which

[0011]

Means for Solving the Problems In order to solve the above-mentioned problems, according to the present invention, a spacer is fixed between vertically divided spinous processes or the like. To provide a spacer stator for fixing.

In the case of fixing a spacer between vertically divided spinous processes, a stator for fixing the spacer and the vertically divided spinous processes is provided, and the spacer stator comprises a main body and a bar. And a spinous spacer stator comprising:

In the case of fixing a spacer between vertically divided spinous processes, a stator for fixing the spacer and the vertically divided spinous processes is provided, and the spacer stator comprises a main body and a bar. And the bar is a spacer stator made of at least a rigid material.

The bar is made of at least a titanium material, has a considerable rigidity and strength, and can be used even in cases where there are individual differences.

The length of the bar of the spacer stator is about 1 mm to several mm, which is preferable for fixing.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 4 shows one example of the spacer stator 1 applied to the spacer 4.

A spacer stator 1 which is one of the embodiments, which is a stator for fixing a spacer 4 formed of artificial bone between spinous processes or the like, has a main body 10 and side surfaces 101 and 102 of the main body 10. , The bar 2 of the insertion part 2 extending from the side surface
It has 0 and 21.

In this case, the bars 20 and 21 are. Side 10
It is preferable that it is perpendicular to 1, 102 because it is easy to manufacture and operate.

As the spacer 4, calcium phosphate, a composite material of tricalcium phosphate and hydroxyapatite, a bioactive glass material such as alumina, zirconia, hydroxyapatite, calcium phosphate, or an organic compound having high biocompatibility such as high-density polyethylene. Metal materials such as titanium and the like can be appropriately selected.

The length of the bars 20 and 21 is about 1 mm to several mm. If it is 4 mm, it will be approximately satisfied even if there are individual differences in the length of the spinous processes.

The body 10 may be as thin as 1 mm.
The following is also possible.

Further, it is considered that the length of the main body 10 is about 3 mm to 4 mm as an example. However, it is possible even if it is 3 mm or less. The length of the bars 20 and 21 is about 0.5 mm
To about 2 mm is possible.

In this embodiment, the bars 20 and 21 have a circular cross section, but the shape is not particularly limited to this, and an elliptical shape, a rectangular shape, a polygonal shape or the like can be adopted.

Further, the main body 10 and the bars 20 and 21 may be integrally formed, but if at least the bars 20 and 21 are made of titanium, more preferable strength can be obtained. Other strong materials can be selected.

The main body 10 and the side surfaces 101 and 102 of the main body 10 are in contact with the longitudinal dividing surfaces 70, 70 of the spinous processes 7 of the cervical spine, and the bars 20, 21 of the insertion section 2 are the longitudinal sides of the spinous processes 7 of the cervical spine. It is inserted and fixed in the hole made in the split surface.

In this embodiment, the main body 10 has a disc shape, but the shape is not limited to this particular shape, and it is needless to say that it may be an elliptical shape, a rectangular shape or a polygonal shape. Is.

In order to attach the spacer stator 1 to the spacer 4 and the longitudinal split surfaces 70, 70 of the spinous processes 7 of the cervical spine, first, the vertebral arch 6 is formed with the side grooves 80, 80 of about 1, 2 mm to form the spines. Divide the protrusion vertically to enlarge it.

Next, a fixing hole 801 is formed in a substantially central portion of the vertically divided spinous processes 70, 70. Holes 401 are already formed in both ends of the spacer.

Next, the vertical split surfaces 70, 70 of the spinous process 7 are opened, the spacer 4 is sandwiched in the gap, and the spacers 1 are interposed between the bars 20, 21 of the insertion portion 2.
Is inserted into the fixing hole 801 in the substantially central portion of the spinous processes 70, 70.

In this case, the bar 20 of the insertion portion 2 may be already inserted on the spacer 4 side, or conversely, the bar 20 may be first inserted and fixed on the spinous process 7 side. After that, the other bars 20 and 21 may be inserted and fixed to the spacer 4.

Here, in order to maintain the stable fixing property of the spacer stator 1, as shown in FIG.
1 direction and fixing hole 801 and spacer 401 hole 401
It will be appreciated that the directions of the holes are preferably coincident.

After the operation, the spacer 4 is pressed from both sides between the spinous processes in order to close the longitudinally split spinous processes. Due to this pressing force, the spacer 4 is firmly fixed between the spinous processes through the main body portion 10 and by the presence of the bars 20 and 21 of the spacer stator 1. The fixation is
Even if the cervical spine moved after the operation, the fixation was firm and there was no problem, and it was found that the fixation was reliably maintained.

In the embodiment shown in FIG. 4 (2) and FIG. 4, the spacer 4 has a trapezoidal shape, which is trapezoidal when the distal end of the spinous process is cut and expanded. Therefore, the spacer 4
The trapezoid has a trapezoidal shape, but is not limited to this.

For example, as shown in FIG. 4 (3), when the spinous process surface 70 and the spacer 4 are fixed, the cross section of the main body 10 maintains a trapezoidal relationship so as to maintain a trapezoidal shape. It may be (triangular in cross section).

In this case, even if the spacer 4 has a rectangular cross section, it can be substantially trapezoidal.

Further, if the hole 401 on the spacer 4 side is formed in a right angle with respect to the longitudinal split surfaces 70, 70 of the spinous process 7, there is a stool for inserting and fixing the spacer 4 in advance.

In the above embodiment, the spinous process 70 is divided vertically.
Although the fixing hole 801 was formed in the substantially central portion of 70 and the bars 20 and 21 of the insertion portion 2 of the spacer stator 1 were inserted, in the embodiment as shown in FIG. Absent.

That is, the pointed portion 2 in which the tip of the bar 20 is sharpened
This is because it is also possible to set the number as 01, stab the bar in the spinous process, and then insert and fix the spacer 4 thereafter.

In this case, since the spacer 4 side can be inserted into the hole 401 as in the previous embodiment, it is possible to simply have a circular cross section, and therefore it is necessary to sharpen both ends of the bars 20, 20. However, when both ends are sharpened, it is not necessary to check which one is the sharpened side and perform the surgery, so that the surgery can be speeded up.

In the above embodiment, the spacer 4 can be fixed between the vertically divided spinous processes by the stator 1. However, as shown in FIG. Also in the above, the spacer 4 is replaced with the spacer stator 1.
It can also be attached via.

That is, it can be used for a single-opening type cervical spinal canal dilatation other than the cervical spinous process longitudinal split laminoplasty, and can be widely applied to surgery using the spacer 4.

Further, when the spinous process 7 is short, or when the spinous process 7 is thin and damaged during the operation, the spacer 4 can be inserted between the vertebral arches 6, 6 as shown in FIG. .

[0043]

As described above, according to the present invention, the use of the spacer stator for the spacer eliminates the need for wires, silk threads, synthetic threads, etc. The time to conclude is not necessary, and surgery can be performed in a short time.

Further, it can be brought into close contact with the vertically split surface of the vertically split spinous process, and there is no fear of cutting with a wire, silk thread, synthetic thread or the like, and there is a fixing strength and a structural strength. It became possible to fix it securely. In addition, it can be similarly used for unilateral cervical spinal canal dilatation other than cervical spinous process longitudinal laminoplasty and can be effectively used between vertebral arches, and is widely used for those using spacers. Applicable.

Further, since it can be easily inserted and fixed, the amount of bleeding as in the conventional case is greatly reduced and the safety of surgery is further enhanced.

[Brief description of drawings]

FIG. 1 shows a situation of longitudinal division of a spinous process in a cervical spine in a conventional surgery.

FIG. 2 shows a situation in which a conventional spacer is cut and fastened and fixed to a spinous process with a thread.

FIG. 3 shows a cross section of a cervical spine.

FIG. 4 shows a perspective view of a spacer stator according to an embodiment of the present invention.

FIG. 5 shows a state in which a spacer stator according to an embodiment of the present invention is attached between a spinous process and a spacer.

FIG. 6 shows another embodiment of the spacer stator of the present invention.

FIG. 7 shows a state in which a spacer stator according to an embodiment of the present invention is attached between vertebral arches and between spacers.

FIG. 8 shows a state in which the spacer stator is attached between the pedicle and the spacer when the spinous process is short or thin and broken in the embodiment of the present invention.

[Explanation of symbols]

1 Spacer stator 10 Main body 101, 102 side 2 Insert 20, 21 bar 4 spacers 401 holes 7 spinous processes 70 Vertical split surface

Claims (5)

[Claims] 1. A spacer stator for fixing a spacer between vertically divided spinous processes, wherein a spacer for fixing the spacer and the vertically divided spinous process is provided. 2. For fixing a spacer between vertically divided spinous processes or the like, a stator for fixing the spacer and the vertically divided spinous processes or the like is provided, and the spacer stator is a main body portion. Spacer stator characterized by consisting of 3. For fixing a spacer between vertically divided spinous processes or the like, a stator for fixing the spacer and the vertically divided spinous processes is provided, and the spacer stator is a main body part. And a bar, and the bar is made of at least a rigid material, which is a spacer stator. 4. The spacer stator according to claim 3, wherein the bar is made of at least a titanium material. 5. The spacer stator according to claim 2, wherein the bar length of the spacer stator is about 1 mm to several mm.