KR200248093Y1 - reamer for use in posterior lumbar interbody fusion - Google Patents

Abstract

PURPOSE: The present invention enables simultaneous lumbar fusion and posterior lumbar fusion in one operation on the dorsal side. In particular, the removal of the intervertebral disc and the relaxation of the annulus of the vertebrae and the intervertebral disc and the cartilaginous disc surrounding the intervertebral disc It is an object of the present invention to provide a reamer for posterior lumbar fusion that primarily maintains the removal and fusion site.

Composition: This reamer for lumbar lumbar fusion is a handle (3), a rod (5) coupled to the center of the longitudinal direction of the handle (3) in a vertical state and having a long axis with a proximal end and a distal end, and a rod (5). It is fixed to the distal end of the) and comprises a plate-shaped body (7) having a constant thickness having a blade (9) and a guide groove (11) in the longitudinal direction, the blade (9) unites adjacent vertebrae In order to be inserted into the intervertebral disc space defining the intervertebral vertebrae of the pre-determined holding state, it is formed at each corner of the body 7 to ablate the intervertebral disc, and the guide groove 11 is cut off by the blade 9 It is formed in a semicircle on the side of the blade 9 so as to discharge the intervertebral disc debris out of the vertebrae.

EFFECTS: The present invention can safely and easily perform anterior lumbar fusion for fusion of the anterior lumbar vertebra in one operation and posterior lumbar fusion for fusion of the posterior bones, without damaging the nerve tissue around the lumbar spine. And the removal of cartilage surrounding the intervertebral disc, the conquest of the deformed lumbar spine without damaging the artificial instrument or damaging the nerve tissue, and the insertion of various magnetic bones or artificial instruments, respectively.

Description

Reamer for posterior lumbar fusion {reamer for use in posterior lumbar interbody fusion}

The present invention enables the simultaneous operation of anterior lumbar fusion and posterior lumbar fusion in a single procedure on the dorsal surface. The present invention relates to a reamer for posterior lumbar fusion that primarily maintains the fusion site.

Lumbar fusion is a surgery to attach the vertebrae of the lumbar spine of patients with deformities, osteomyelitis, or fractures of the lumbar spine. The patient suffered from complications and sequelae.

Therefore, posterior lumbar fusion is applied to expand the posterior lumbar spine and fuse the anterior lumbar body with his pelvic bone at the back of the lumbar spine. The best results and success rates.

Nevertheless, the current lumbar fusion device was not suitable for the actual pelvic bone fusion because it was configured to be used only with artificial discs. Therefore, in practice, lumbar fusion using his pelvic bone has been avoided.

Also, in the case of fusion using artificial disks, the fusion instruments were made based on the large size of Westerners, which was not suitable for relatively small Asians, and completely removed the bone called the intervertebral disc surrounding the lumbar spinal nerves. Without it, it was impossible to attach the lumbar spine.

In addition, in the process of preparing the fusion site, the existing instruments did not completely remove the intervertebral disc, and the operation itself was difficult when the lumbar bone gap was narrow.

The present invention has been made in view of these points, and it is safe and easy to perform anterior lumbar fusion for fusion of the anterior lumbar vertebrae with a single operation from the rear using artificial discs or magnetic pelvic bones. In particular, the purpose of the present invention is to provide a reamer for posterior lumbar fusion, in which the intervertebral disc removal and the circumference of the vertebrae and intervertebral discs are relaxed, and the cartilage venous plate surrounding the intervertebral disc and the primary site of the fusion site. have.

Rear lumbar fusion reamer for realizing this is a handle, a rod coupled vertically to the center of the longitudinal direction of the handle, the rod forming a long axis having the proximal end and the distal end, fixedly formed on the distal end of the rod, in the longitudinal direction It comprises a plate-shaped body having a constant thickness having a blade and a guide groove.

Here, a blade is formed at each corner of the body to insert the intervertebral disc space defining interstitial vertebrae of a predetermined holding state in order to union adjacent vertebrae.

The guide groove is formed in a semicircle on the side of the blade so as to discharge the intervertebral disc scraped by the blade out of the vertebrae.

The body may be formed in a rectangular parallelepiped type in which all four blades formed at each corner of the body are formed in parallel.

In addition, the body is formed of a hexahedron type of the blade, two blades on one side formed in parallel and two blades on the other side formed in parallel with the blade is converging with each other in the virtual space and the other side is formed far away. May be This makes it suitable for removal of the intervertebral disc located between each of the fourth and fifth lumbar vertebra and the sacral vertebrae.

In addition, since the body includes two depth marking grooves at a portion connected to the rod, it is possible to know how much the body is inserted in the intervertebral disc. This can prevent damage to the aorta or vena cava due to tendon rupture located in front of the spine.

In particular, the present invention allows the use of a small reamer during fusion, when gradually forming a body of various sizes, it is possible to use a gradually larger reamer, so that the intervertebral disc and intervertebral disc without damaging the nerve tissue around the lumbar spine Removal of the cartilage surrounding it allows for the deformation of the deformed lumbar spine without damaging the artificial device or nerve tissue, and the insertion of various magnetic bones or devices.

1 is a perspective view of a first embodiment of a reamer for posterior lumbar fusion according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3 is a perspective view of a second embodiment of the reamer for posterior jujube fusion according to the present invention.

4 is a cross-sectional view taken along the line B-B in FIG.

5 is a plan view of a reamer use state for cutting an intervertebral disc;

Fig. 6 is a side view of a reamer use state for cutting an intervertebral disc.

Fig. 7 is a side view of the reamer use state for cutting off each intervertebral disc between the fourth and fifth lumbar vertebra and the sacral vertebra;

* Description of the symbols for the main parts of the drawings *

1: reamer

3: handle

5: Load

7: body

9: blade

10: depth display groove

11: guide home

Advantages and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

1 is a perspective view of a first embodiment of the rear lumbar fusion reamer according to the present invention, configured to be used in the posterior lumbar fusion with a chisel (not shown, not shown) and a retractor (not shown, hereinafter omitted) It is.

Here, the reamer 1 can be used to remove intervertebral discs located between the vertebrae, to relax the lumbar bone and the annulus fibrosus surrounding the intervertebral discs, and to primarily maintain the site of removal and union of the cartilage end plates surrounding the intervertebral discs. It is composed.

Chisels are used for the maintenance of cartilage endplates and subchondral bone tissue surrounding the intervertebral discs after appropriate removal of the intervertebral discs for implantation of pelvic or artificial discs.

The retractor is then used to protect nerve tissues such as the dura mater and nerve roots during resection of the intervertebral discs and surrounding cartilage plates, or during insertion of magnetic bones or artificial discs.

The reamer 1 is largely formed of a handle 3, a rod 5, and a body 7, and the handle 3 is coupled to the rod 5 at a right angle to easily rotate the rod 5. It is.

The rod 5 has a proximal end fixed to the handle 3 and a distal end provided with the body 7, and is elongated in a straight line. Here, the proximal end and the distal end are named according to the distance of the operator.

The body 7 formed on the distal end of the rod 5 rotated by the handle 3 to ablate the intervertebral disc is formed in a flat state having a predetermined thickness, and the blade 9 and the rod 5 formed at four corners thereof. And the depth display groove 10 formed on the side.

In addition, a guide groove 11 is formed on the side of the blade 9 to guide the discharge of the debris of the intervertebral disc cut off by the blade 9.

As shown in FIG. 2, as the blade 9 is formed at four corners of the body 7, the guide groove 11 is also formed at four sides of the blade 9 to be generated at each blade 9. Guide the intervertebral disc debris out of the intervertebral disc.

In addition, the depth display groove 10 makes it possible to confirm how much the body 7 is inserted into the intervertebral disc. One or more of the depth indicating grooves 10 may be formed, but examples of the depth indicating grooves 10 are formed at positions 35 and 40 mm from the tip of the body 7, respectively. The depth indicating groove 10 indicates the degree to which the tip of the body 7 is inserted in the intervertebral disc during surgery, and thus, the tip of the body 7 ruptures the tendon located in front of the spine, thereby damaging the aorta or the vena cava. To prevent it.

The reamer 1 formed as described above has a tip width a of 6, 8, 10, 12, and 14 mm in various sizes, so that the larger one can be gradually used after the small one is used during fusion. do.

As described above, the body 7 having the blade 9 and the guide groove 11 may be formed in a rectangular parallelepiped type having one side attached to the distal end of the rod 5. That is, the blades 9 of the four corners of the body 7 may all be formed in a parallel state.

In addition, the body 7 may be formed in a hexahedron type having one side attached to the distal end of the rod 5 as shown in FIG. 3. That is, among the blades 9 of the four corners of the body 7, the tip of the rod 5 side of the two blades 9 on one side formed in parallel and the two blades 9 on the other side formed in parallel on the other side Converging with each other in this virtual space and the opposite end may be formed far.

As such, the distal end of the blade 9 may be formed in the opposite direction. That is, the two blades 9 on one side formed in parallel with each other and the tip of the rod 5 side of the two blades 9 on the other side formed in parallel on the other side are far apart and the opposite ends are formed to converge in the virtual space. May be

As the blade 9 is formed as described above, the guide groove 11 formed on one side of the blade 9 is also formed in the same direction as the blade 9, as shown in FIG. Smooth discharge of moderate disc debris

Such a cube-shaped reamer 1 of FIG. 3 has the same effect as the reamer 1 of FIG. 1, but its application part is somewhat different as will be described later.

This cuboid type body 7 has a long width b and a short width c, unlike the rectangular parallelepiped type having a constant width a, so that one side blade 9, 9 and the other side blade 9, One end of 9) converges and the other side is formed away from it.

The long width (b) and the short width (c) are formed in various sizes such as 6 × 8, 8 × 10, 10 × 12, 12 × 14 mm, and then gradually increase in size after the use of the small reamer 1 during fusion. Allows use of the reamer (1).

As shown in FIGS. 5 and 6, the reamer 1 of FIG. 1 is used by placing the tip of the body 7 on the intervertebral disc between the vertebral bodies 13 and 15. In this state, the handle 3 is rotated to cut the intervertebral disc with the blade 9 to drill a hole into which a magnetic pelvic bone or artificial disk is inserted.

In this way, after cutting the intervertebral disc at the fusion site with the reamer 1, the intervertebral disc at the fusion site is finished. Then, the retractor is placed at the fusion site to insert a magnetic pelvic bone-bearing artificial disc.

3, the reamer 1 of FIG. 3 is applied between the fourth and fifth lumbar vertebrae 17 and 19 and the sacral vertebra 21 having an intervertebral disc having the same shape as that of the body 7. Since the method of use is the same as that of the reamer 1 of FIG. 1, a detailed description thereof will be omitted.

However, the reamer 1 of FIG. 3 has a shape similar to that of the intervertebral disc 23 positioned between the fourth and fifth lumbar vertebrae 17 and 19 and the sacral vertebrae 21. Make anterior removal easier

That is, the intervertebral disc 23 between the fourth and fifth lumbar vertebrae 17 and 19 and the lumbar vertebrae 21 is formed with a thicker anterior side of the vertebrae than a posterior side, and the body 7 has a corresponding tip width so as to correspond thereto. It is formed of this wide cube.

As such, the reamer of the present invention is used together with the chisel and the retractor to combine the anterior lumbar fusion with the anterior lumbar vertebra in one operation from the rear using an artificial disc or magnetic pelvic bone and the posterior lumbar fusion Make fusion safe and easy.

In particular, in the reamer of the present invention, the blade is formed at the edge of the flat plate body, has a guide groove around the blade, and has a depth marking groove so that the cartilage surrounding the intervertebral disc and the intervertebral disc without damaging the nerve tissue around the lumbar spine. It allows for easy removal of the body, and the use of a progressively larger body allows for a gradual relaxation of the annulus connecting the vertebrae and the soft tissues surrounding it, thus deforming the artificial tissues that hold the vertebrae and without damaging the nerve tissue. It is possible to conquer the lumbar spine that caused the disease, and to allow the insertion of various magnetic bones or artificial instruments.

Claims (4)

Handle (3), A rod 5 coupled to the center in the longitudinal direction of the handle 3 in a vertical state, the rod having a proximal end and a distal end to form a long shaft; It is fixed to the distal end of the rod 5, and includes a plate-like body (7) having a constant thickness having a blade (9) and a guide groove (11) in the longitudinal direction, The blades 9 are formed at each corner of the body 7 to be inserted into the intervertebral disc space defining between the adjacent vertebrae in a pre-determined holding state in order to union the adjacent vertebrae, and to ablate the intervertebral discs, The guide groove 11 is a posterior lumbar fusion reamer, characterized in that formed in a semicircle on the side of the blade (9) to discharge the intervertebral disc debris cut by the blade (9) out of the vertebrae. 2. The reamer according to claim 1, wherein the body (7) is a rectangular parallelepiped type in which all four blades are formed in parallel. According to claim 1, wherein the body (7) of the blade, two blades on one side formed in parallel and two blades on the other side formed in parallel separately from the blade is converged in one side of the virtual space and the other side is Reamer for a posterior lumbar spine, characterized in that the hexahedral type formed away. 2. Reamer according to claim 1, wherein the body (7) comprises a depth indicating groove (10) formed in a portion connected with the rod (5).