JPH08336548A - Centrum screw of spine correcting device - Google Patents

Abstract

PURPOSE: To prevent the front end of a centrum screw from projecting from the centrum and to prevent the damage of the artery, veins and nerves by providing the centrum screw with a head part provided with a rod insertion hole and a threaded part to be screwed to the centrum and forming the front end of the threaded part to a plane or curved surface. CONSTITUTION: The centrum screw 20 has the head part 23 provided with the insertion hole 22 opened 21 at its flank and the threaded part 24 to be screwed to the centrum and the front end face 25 of the threaded part 24 is formed to a plane or curved surface. The threaded hole 26 is formed atop the head part 23 and a lock screw 27 is screwed therein, by which a knurling type rod 35 inserted into the rod insertion hole 22 is fixed. A centrum plate 30 projectingly provided with spikes 31 from the four corners of an approximately square top plate 31 is arranged on the flank of the centrum and the centrum screw 20 is passed into an opening 33 formed at the top plate 31 and is screwed to the centrum in order to correct the centrum of, for example, the patient's thoracolumbar vertebrae.

Description

Detailed Description of the Invention

[0001]

The present invention relates to scoliosis of the thoracic spine and lumbar spine,
The present invention relates to a vertebral body screw of a spinal correction device that corrects intervertebral instability such as trauma.

[0002]

2. Description of the Related Art Surgical treatment methods for correcting twisting and bending of a vertebral body of a patient with scoliosis include an anterior treatment method for correcting the vertebral body from the lateral side (medicalally called anterior) and a vertebral body for posterior treatment. There is a posterior treatment method that corrects from the side. The means to correct twisting and bending of the vertebral body of patients with scoliosis is applied not only for the treatment of normal scoliosis, but also for the treatment of vertebral body damage and defects due to accidents and tumors, and the treatment of intervertebral skid. However, the treatment of scoliosis involves a large number of target vertebral bodies and is a treatment across multiple vertebral bodies. Also, there are two treatments for vertebral body damage and defects.
~ Treats between 3 vertebral bodies.

As an example of the spine correction device used in the anterior treatment method for treating vertebral body damage, tumor, etc., there are examples shown in FIGS. 8 and 9. The spinal correction device shown in FIG. 8 and FIG. 9 has vertebral body plates 1 and 2 with spikes provided with two openings in the top plate, and vertebral bodies through two openings provided with the respective vertebral body plates 1 and 2 in the top plate. Vertebral body screw 3,
3, two screw rods 4 and 4 for connecting the vertebral body screw 3 provided on the vertebral body plate 1 and the vertebral body screw 3 provided on the vertebral body plate 2, and the screw rod 4 to the vertebral body screw 3
It is composed of fixing nuts 5 and 6 fixed to the vertebral body plate 1 and a rod bridge connecting device 7 that bridges and connects the two screw rods 4 and 4 between the vertebral body plate 1 and the vertebral body plate 2.

The vertebral body screw 3 of the spinal correction device is
As shown in FIG. 10, it is a structure having a head portion 9 provided with a rod insertion hole 8 for passing the screw rod 4 and a screw portion 10 screwed to a vertebral body, and a tip portion 10a of the screw portion 10 is attached to the vertebral body. It has an acute-angled end to facilitate screwing.

In the above-mentioned spinal correction apparatus, as shown in FIG. 11, in order to attach the spiked vertebral body plates 1 and 2 to a patient, a pair of spiked vertebral body plates 1 and 2 are
The vertebral body screws 3, 3 are arranged on the side surfaces of the normal vertebral bodies 12, 13 located in front of and behind the damaged or defective vertebral body 11,
The vertebral body plates 1 and 2 are fixed to the normal vertebral bodies 12 and 13 by being screwed to the normal vertebral bodies 12 and 13 through two openings provided in the top plates of the vertebral body plates 1 and 2, respectively. The tip portion 10a of the screw portion 10 of the vertebral body screws 3 and 3 projects outward from the opposite side surface of the normal vertebral bodies 12 and 13. For the treatment of a patient whose vertebral body is damaged or lost due to an accident, tumor or the like, the damaged vertebral body 11 and the intervertebral disc located between the normal vertebral body 12 and the normal vertebral body 13 are removed, This is done by inserting other bone or ceramic bone into the part.

[0006]

The vertebral body screw of the above-described spinal correction device has a structure in which the tip of the threaded portion is a sharp end in order to facilitate screwing into the vertebral body, and the fixation to the vertebral body is ensured. Therefore, it is necessary to insert the screw portion into a strong portion of the outer peripheral portion of the vertebral body, and the tip end portion of the screw portion is projected outside the surface of the vertebral body. However, the arteries near the vertebral body,
If there are veins, nerves, etc., and the tip of the screw part of the vertebral body screw projects out of the vertebral body, the protrusion of the screw part may damage the arteries, veins, or nerves near the vertebral body. There is a concern that it will end up. The present invention has been made in consideration of the above points, and the tip of the screw portion does not project outside the vertebral body to ensure fixation to the vertebral body, and to secure arteries, veins and nerves near the vertebral body. An object of the present invention is to provide a vertebral body screw of a spinal correction device that is not damaged.

[0007]

A vertebral body screw of a spinal correction device according to a first aspect of the present invention has a head portion provided with a rod insertion hole and a screw portion screwed to the vertebral body. It is characterized in that the tip is flat or curved. The vertebral body screw of the spinal correction apparatus according to claim 2 of the present invention is the vertebral body screw of the spinal correction apparatus according to claim 1, wherein an opening for inserting a rod into the rod insertion hole is provided on a side surface of the head. A vertebral body screw of the spinal correction apparatus according to claim 3 of the present invention is the vertebral body screw of the spinal correction apparatus according to claim 1 or 2, wherein a rod inserted into the rod insertion hole is provided on the upper surface of the head. It is characterized in that a fixing screw for fixing is provided.

[0008]

The vertebral body screw of the spinal correction device of the present invention has a flat or curved tip portion of the screw portion to be screwed to the vertebral body, and is screwed to the vertebral body in order to fix the vertebral body plate to the vertebral body. When worn, the tip of the vertebral body screw does not protrude from the vertebral body, and even if there are arteries, veins or nerves near the vertebral body, the arteries, veins or nerves are not damaged.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a perspective view of a vertebral body screw of a spinal correction device according to the present invention. This vertebral body screw 20 has a side opening 2
1 has a head 23 provided with a rod insertion hole 22 and a screw portion 24 screwed to a vertebral body, and a tip surface 25 of the screw portion 24 is a flat surface or a curved surface. Also, the vertebral body screw 20
A screw hole 26 is formed on the upper surface of the head 23 of
A fixing screw 27 is screwed into the screw hole 26. The fixing screw 27 acts to fix the knurled rod 35 inserted into the rod insertion hole 22. The length of the screw portion 24 of the vertebral body screw 20 is such that when the screw portion 24 is screwed onto the vertebral body of the thoracolumbar vertebra portion to correct twist or bend, the tip surface 25 of the screw portion 24 protrudes from the vertebral body. It is not long enough. The length of the screw portion 24 is determined according to the size of the vertebral body.

FIG. 2 shows the vertebral body plate of the spinal correction device. The vertebral body plate 30 is for correcting twisting and bending of the vertebral body of the thoracolumbar region, and has a substantially square top plate 3.
1 and four spikes 32 provided at each corner of the top plate 31, and the top plate 31 is formed with an opening 33 for inserting the vertebral body screw 20.

FIGS. 3 and 4 show a spinal correction device for correcting twisting and bending of the vertebral bodies of the thoracolumbar region. The spinal correction device shown in FIGS. 3 and 4 includes spiked vertebral body plates 30 and vertebral bodies 34 of the thoracolumbar vertebrae.
Vertebral body screw 20 to be fixed to each vertebral body screw 2
It is composed of a knurled rod 35 connecting 0s.

Next, the operation will be described. To attach the spiked vertebral body plate 30 to the vertebral body 34 of the patient's thoracolumbar region as shown in FIGS. 3 and 4, place the vertebral body plate 30 on the side of the vertebral body 34 that requires correction. , The vertebral body screw 20 is provided on the top plate 31 of the vertebral body plate 1
This is done by screwing the vertebral body 34 through the three openings 33. In this case, the length of the threaded portion 24 of the vertebral body screw 20 is set such that the distal end surface 25 of the threaded portion 24 does not protrude from the vertebral body of the thoracolumbar region where the twisting and bending are to be corrected. The distal end surface 25 of the screw portion 24 of the vertebral body screw 20 does not protrude from the vertebral body 34. Therefore,
Even if there are arteries, veins and nerves near the vertebral body 34 in the thoracolumbar region, the arteries, veins and nerves are not damaged by the tip surface 25 of the screw portion 24 of the vertebral body screw 20. To correct the thoracolumbar region of the patient, the knurled rod 35 is inserted into the rod insertion hole 22 provided in the head portion 23 of the vertebral body screw 20 fixed to the vertebral body 34, and the knurled rod 35 is inserted.
Fixing screw 26 provided on the head 23 of the vertebral body screw 20
And the elastic force of the knurled rod 35 is used.

FIG. 5 shows another embodiment of the vertebral body screw of the spinal correction device according to the present invention. In this embodiment,
The vertebral body screw 40 includes a head portion 42 having a rod insertion hole 41 and a screw portion 43 screwed to the vertebral body.
The front end surface 44 of is substantially flat. A screw hole 45 is formed on the upper surface of the head 42 of the vertebral body screw 40, and a fixing screw 46 is screwed into the screw hole 45. The vertebral body screw 40 has a length such that the distal end surface 44 of the screw portion 43 does not protrude from the vertebral body of the thoracolumbar vertebral portion where correction of twisting or bending is desired. FIG. 6 shows the vertebral body plate 5 of the spinal correction device.
0, the vertebral body plate 50 is a substantially rectangular top plate 5.
1 and a spike 52 provided at each corner of the top plate 51, and two openings 53, 53 are formed in the top plate 51.

To attach the spiked vertebral body plate 50 to the vertebral body of the patient's thoracolumbar region, place the spiked vertebral body plate 50 on the side of the vertebral body 60, as shown in FIG.
The vertebral body screw 20 or the vertebral body screw 40 is provided in the top plate 51 of the vertebral body plate 50 with two openings 53, 53
Through the vertebral body 60. Then, for vertebral body correction of the thoracolumbar region of the patient, the knurled rod 3 is inserted into the rod insertion hole 22 or 41 provided in the head of the vertebral body screw 20 or 40 fixed to the vertebral body 60.
5, the knurled rod 35 is fixed to the vertebral body screw 20 or 40 by the fixing screws 27 or 46, and the elastic force of the knurled rod 35 is utilized.

[0015]

As described above, according to the present invention, the vertebral body screw is screwed to the vertebral body in order to fix the vertebral body plate to the vertebral body by making the tip of the screw portion of the vertebral body screw flat or curved. At this time, the tip of the vertebral body screw does not protrude from the vertebral body, and even if there are arteries, veins or nerves near the vertebral body, the vertebral body screw does not damage the arteries, veins or nerves.

[Brief description of drawings]

FIG. 1 is a perspective view of a vertebral body screw of a spinal correction device according to the present invention.

FIG. 2 is a perspective view of a vertebral body plate.

FIG. 3 is a view showing the arrangement of the spinal correction device on the lateral side of the spine.

FIG. 4 illustrates placement of a spinal correction device on the anterior surface of the spine.

FIG. 5 is a view showing another embodiment of the vertebral body screw of the spinal correction device according to the present invention.

FIG. 6 is a perspective view of a vertebral body plate.

FIG. 7 is a view showing a state where the vertebral body plate of FIG. 6 is attached to a vertebral body.

FIG. 8 is a front view of a conventional spinal correction device.

FIG. 9 is a perspective view of a conventional spinal correction device.

FIG. 10 is a side view of a conventional vertebral body screw.

FIG. 11 is a view showing the arrangement of a conventional spinal correction device on the lateral side of the spine.

[Explanation of symbols]

 20 Vertebral body screw 21 Side opening 22 Rod insertion hole 23 Head 24 Screw part 25 Tip surface

Claims (3)

[Claims] 1. A vertebral body screw of a spinal orthodontic device, comprising a head portion provided with a rod insertion hole and a screw portion screwed to a vertebral body, and the tip of the screw portion being a flat surface or a curved surface. 2. The vertebral body screw of the spinal correction apparatus according to claim 1, wherein an opening for inserting the rod into the rod insertion hole is provided on a side surface of the head. 3. The vertebral body screw of the spinal correction device according to claim 1, wherein a fixing screw for fixing the rod inserted into the rod insertion hole is provided on the upper surface of the head.