JPH08308855A - Rod bridge-connecting device of spine front correcting device - Google Patents

Abstract

PURPOSE: To enable bridge connection of rods without separating three components from one another and causing the end of a clamp screw to project beyond a lower flange. CONSTITUTION: At least a lower flange 26 is just wide enough to pass between two rods, a projecting boss 27 with a tapped hole 24a formed therein is provided on the inner surface of the lower flange 26, and a recess for accommodating the projecting boss 27 is provided in the inner surface of an upper flange 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in an anterior spinal correction device for correcting intervertebral instability such as trauma of the thoracolumbar spine, and crosslinks two rods inserted into the head of a vertebral body screw. By doing so, the present invention relates to a rod bridging connection device for an anterior spinal correction device that prevents twisting of the rod and improves the correction force.

[0002]

2. Description of the Related Art Surgical treatment methods for vertebral body damage and defects due to accidents, tumors, etc. and scoliosis include an anterior treatment method in which the vertebral body is corrected from the lateral side (referred to in medical terms as anterior) and There is a posterior treatment method that corrects from the posterior side. Treatment of vertebral body damage and defects extends between a few vertebral bodies.

FIG. 6 shows a spinal anterior orthodontic device used in an anterior treatment method for treating vertebral body damage or tumor.
7 and the example shown in FIG. This anterior spinal correction device
Vertebral body plates 1 and 2 with spikes provided with two openings on the top plate, and vertebral body screws 3, 3 for fixing each vertebral body plate 1, 2 to the vertebral body through the two openings provided on the top plate,
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 a fixing nut 5 for fixing the screw rod 4 to the vertebral body screw 3. , 6 and a rod bridge connecting device 7 for connecting the two screw rods 4 and 4 between the vertebral body plate 1 and the vertebral body plate 2 to each other.

As shown in FIG. 8, the rod bridge connecting device 7 has a screw insertion hole 8 in the central portion and the screw insertion hole 8
An upper flange 10 provided with semi-circular recesses 9 and 9 for receiving a screw rod 4 on both sides thereof, a screw hole 11 in a central portion, and a semi-circular recess 1 for receiving a screw rod on both sides of the screw hole 11.
Lower flange 13 provided with 2, 12 and upper flange 1
0 and a tightening screw 14 that connects the lower flange 13 to each other. A seat portion 8a for receiving the head portion 14a of the tightening screw 14 is formed on the upper surface of the upper flange 10 at the periphery of the screw insertion hole 8. When the upper flange 10 and the lower flange 13 are connected by a tightening screw 14, the semicircular recess 9 and the lower flange 1 provided in the upper flange 10 are connected.
A semicircular recess 12 provided in 3 holds the two screw rods 4 and 4 for connecting the vertebral body screw 3 provided in the vertebral body plate 1 and the vertebral body screw 3 provided in the vertebral body plate 2.
As shown in FIG. 9, the screw rod 4 includes the vertebral body screw 3
It is passed through a rod insertion hole 16 provided in the head 15 of the head and fixed to the vertebral body screw 3 by fixing nuts 5 and 6.

In the case of attaching the vertebral body plates 1 and 2 with spikes to the patient in the anterior spinal correction device shown in FIG.
As shown in FIG. 11 and FIG. 11, a pair of spiked vertebral body plates 1 and 2 are arranged on the sides of normal vertebral bodies 18 and 19 located in front of and behind the damaged or defective vertebral body 17, and the vertebral body screw 3 , 3 provided on the top plate of the vertebral body plates 1 and 2
The vertebral body plates 1 and 2 are connected to the normal vertebral bodies 18 and 19 by screwing them into the normal vertebral bodies 18 and 19 through the two openings,
Fixed to. The vertebral body plates 1 and 2 fixed to the normal vertebral bodies 18 and 19 are provided in the vertebral body plate 2 and the rod insertion hole 16 provided in the head portion 15 of the two series of vertebral body screws 3 provided in the vertebral body plate 1. The screw rods 4 are respectively inserted into the rod insertion holes 16 provided in the heads 15 of the two series of vertebral body screws 3, and the fixing nuts 5 and 6 screwed into the respective screw rods 4 are attached to the heads of the vertebral body screws 3. By fixing the portions 15 from both sides, they are fixed to each other to maintain the normal vertebral body 18 and the normal vertebral body 19 in a stable state.

Two screw rods 4 and 4 are used to fix the vertebral body plates 1 and 2 to each other, but a rod bridge connecting device is used to bridge the two screw rods 4 and 4. 7 to the lower flange 13 of the semicircular recess 12,1
2 is located directly below the screw rods 4, 4 by using a jig (not shown) below the screw rods 4, 4 to insert the upper flange 10 into the semicircular recesses 9, 9. On the upper flange 1
So that the two screw rods 4 and 4 are clamped by the semicircular recess 9 of the upper flange 10 and the semicircular recess 12 of the lower flange 13 by screwing into the screw hole 11 through the screw insertion hole 8 of 0. I have to.

The damaged or defective vertebral body 17 and the intervertebral disc located between the normal vertebral body 18 and the normal vertebral body 19 are removed, and another bone or ceramic bone is inserted into the portion, and an accident, a tumor or the like occurs. Treatment of patients with vertebral body damage or defects caused by

[0008]

In the rod bridge connecting device 7, when the two screw rods 4 and 4 for fixing the vertebral body plates 1 and 2 to each other are bridge connected, the rod bridge connecting device 7 is constructed. The two parts, namely the lower flange 13, the upper flange 10 and the clamping screw 14, are separated and combined together at the surgical site to obtain two screw rods 4,
The work of pinching 4 is required. Performing such operations at the surgery site is performed in a limited space. It is time-consuming, time-consuming, and not practical, and when the three parts are attached to the screw rods 4 and 4, a defect such as the parts falling off may occur.

Further, the width of the lower flange is set to a width that allows the lower flange to pass through between the two rods, and the lower flange and the upper flange are assembled with a tightening screw, and the lower flange is placed between the two rods. A rod bridge connecting device is also proposed in which two screw rods are sandwiched by passing them through. However, in this case, it is necessary to connect the upper flange to the tightening screw when the lower flange is dropped. , The tightening screw must be lengthened considerably, and when two screw rods are sandwiched between the lower flange and the upper flange with the tightened tightening screw, the tip of the tightening screw projects below the lower surface of the lower flange, There is a problem in that the bone or ceramic bone inserted between normal vertebral bodies may be hit. The present invention has been made in view of the above points, and does not separate the three parts separately and does not project the tip of the tightening screw below the lower surface of the lower flange. It is an object of the present invention to provide a rod bridge connecting device of an anterior spinal correction device that enables the above.

[0010]

According to a first aspect of the present invention, there is provided a rod bridging connection device for an anterior spinal correction device, which comprises an upper flange having rod engaging recesses on both sides of a screw insertion hole, and both sides of the screw hole. The vertebral body screw has a lower flange provided with a rod engaging recess and a tightening screw that connects the upper flange and the lower flange by screwing into the screw hole of the lower flange through the screw insertion hole of the upper flange. In a rod bridge connecting device of an anterior spinal correction device that bridges and connects two rods that are inserted into the head of a person, at least the width of the lower flange is set to a width that allows the rod to pass through between the two rods. Is provided with a projecting boss having a screw hole connected to the screw hole, and a recess for receiving the projecting boss is provided on the inner surface of the upper flange. According to a second aspect of the present invention, there is provided a rod bridging connection device for an anterior spinal correction device according to claim 1, wherein the width of the upper flange and the lower flange is smaller than the space between the rods. It is characterized by

[0011]

In the rod bridge connecting device of the anterior spinal correction device of the present invention, at least the width of the lower flange is such that it can pass through between the two rods, so that the lower flange can be assembled without separation. While maintaining the
It can be placed directly under the two rods through the space between the two rods, the inner surface of the lower flange is provided with a projecting boss having a threaded hole, and the inner surface of the upper flange is provided with a recess for receiving the projecting boss, By housing the protruding boss in the recess, it is possible to widen the gap between the upper flange and the lower flange without increasing the length of the tightening screw that connects the upper flange and the lower flange. The tip does not protrude below the lower surface of the lower flange.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, the same members as those in FIG. 8 are designated by the same reference numerals. FIG. 1 is an exploded perspective view of a rod bridge connecting device of an anterior spinal correction device according to the present invention, and FIG. 2 is a view showing a state in which the rod bridge connecting device is incorporated into the anterior spine correction device shown in FIGS. 4 and 5. is there.

1 and 2, reference numeral 20 indicates a rod bridge connecting device of the anterior spinal correction device. The rod bridge connecting device 20 is incorporated into the anterior spinal correction device shown in FIGS. 4 and 5 or the anterior spinal correction device shown in FIGS. 6 and 7. The anterior spinal correction device shown in FIGS. 4 and 5 is different from the anterior spinal correction device shown in FIGS. 6 and 7 only in the structures of the vertebral body screw 3 and the rod.

In the anterior spinal correction device shown in FIGS. 4 and 5, the vertebral body plates 1'and 2'with spikes having two openings in the top plate and the vertebral body plates 1'and 2'on the top plate are used. Vertebral body screws 3'and 3'fixed to the vertebral body through the two openings provided, vertebral body screw 3'provided on vertebral body plate 1'and vertebral body screw 3'provided on vertebral body plate 2 '
Two knurled rods 4 ', 4'connecting to each other, a fixing screw 5'for fixing the knurled rod 4'to the vertebral body screw 3', a vertebral body plate 1'and a vertebral body plate 2 '.
Knurled rod 4'consisting of a rod bridging connection device 20 for bridging the two knurled rods 4 ', 4'to each other between the knurled rods 4'and 4', which are inserted into the vertebral body screw 3 '.
Is fixed to the vertebral body screw 3 ′ by a fixing screw 5 ′ provided on the upper surface of the vertebral body screw 3 ′.

The rod bridging connection device 20 has a screw insertion hole 21 in the center and a screw rod 4 (FIG. 6) or a knurled rod 4'inserted into the head of the vertebral body screw on both sides of the screw insertion hole 21. (FIG. 4) Upper flange 23 provided with semicircular recesses 22, 22 for receiving, and lower side provided with screw hole 24 in the central portion and semicircular recesses 25, 25 for receiving rods on both sides of screw hole 24. It is composed of a flange 26 and a tightening screw 14 that connects the upper flange 23 and the lower flange 26.

The lower flange 26 has two knurled rods 4 arranged at intervals as shown in FIG.
′, 4 ′ or a width such that it can pass through between the two screw rods 4 and 4 arranged at intervals as shown in FIG. 6, and a protruding boss 27 is formed on the inner surface. The protruding boss 27 has a screw hole 24 formed in the lower flange 26.
Is formed with a screw hole 24a. Therefore, the length of the screw hole provided in the lower flange 26 is the sum of the length of the screw hole 24 and the length of the screw hole 24a. Further, the inner surface of the upper flange 23 is formed with a recess 28 for receiving the protruding boss 27 provided on the lower flange 26. The depth of the recess 28 is such that the protruding boss 27 can be accommodated therein. Therefore, the concave portion 2 provided in the upper flange 23
When the two screw rods 4 (FIG. 6) or the knurled rod 4 ′ are clamped by the upper flange 23 and the lower flange 26, 8 accommodates the protruding boss 27 provided on the lower flange 26.

That is, the rod bridge connecting device 20 described above.
Is formed by forming a screw hole 24a in the protruding boss 27 formed on the inner surface of the lower flange 26, so that the tightening screw 14 connecting the upper flange 23 and the lower flange 26 can be connected without increasing the length. The distance between the upper flange 23 and the lower flange 26 can be increased, and when the two screw rods 4 and 4 or the knurled rods 4'and 4'are held between the upper flange 23 and the lower flange 26, the lower flange The projecting boss 27 provided at 26 does not hit the inner surface of the upper flange 23. In addition, the width of the lower flange 26 is set to be two screw rods 4, 4 or knurled rods 4 ′, 4
Since the width is such that it can pass through between the upper flange 23 and the lower flange 26, the lower flange 26 is connected to the two screw rods 4,
4 or knurled rods 4 ', 4'can be dropped between them.

Next, the operation will be described. First, the rod bridge connecting device 20 is provided with an upper flange 23 and a lower flange 26.
The upper flange 23 with the tightening screws 14 connected.
The distance between the inner surface of the and the inner surface of the lower flange 26 is larger than the diameter of the screw rod 4 or the knurled rod 4 ',
The lower flange 26 is rotated 90 degrees with respect to the upper flange 23 to position the lower flange 26 in a direction orthogonal to the upper flange 23. Then, the rod bridging connection device 20 is set so that the lower flange 26 is located directly above between the two screw rods 4 and 4 or the knurled rods 4'and 4 ', and the lower flange 26 is dropped downward as it is. The lower flange 26 is dropped between the two threaded rods 4, 4 or the knurled rods 4 ', 4'. Then, the upper flange 23 is provided with the semicircular recesses 22, 22 having two screw rods 4, 4 or knurled rods 4 ', 4'.
The threaded rods 4, 4 or knurled rods 4 ', 4'corresponding to.

Next, the lower flange 26 is turned 90 degrees so that the upper flange 23 and the lower flange 26 are aligned with each other, and the semi-circular recesses 25, 25 of the lower flange 26 are fitted into the two screw rods 4, 4. 4 or knurled rods 4 ', 4
Set it to the position corresponding to ´. In this way, the semi-circular recesses 22 and 22 of the upper flange 23 and the semi-circular recess of the lower flange 26 are positioned so as to sandwich the two screw rods 4 and 4 or the knurled rods 4'and 4 '. Then, the tightening screw 14 is turned in the tightening direction to clamp the two screw rods 4, 4 or the knurled rods 4 ′, 4 ′ between the upper flange 23 and the lower flange 26.

When the tightening screw 14 is turned in the tightening direction and the two screw rods 4, 4 or the knurled rods 4 ', 4'are held by the upper flange 23 and the lower flange 26, the lower flange 26 Since the projecting boss 27 having the screw hole 24a formed on the inner surface thereof is provided and the concave portion 28 for receiving the projecting boss 27 is provided on the inner surface of the upper flange 23, the tightening screw 14 for connecting the upper flange 23 and the lower flange 26 together. It is possible to widen the distance between the upper flange 23 and the lower flange 26 in a connected state without making the length longer than the conventional tightening screw 14. In this way, since it is not necessary to increase the length of the tightening screw 14, the tightening screw 14
Does not protrude below the lower surface of the lower flange 26.

FIG. 3 shows another embodiment of the rod bridge connecting device according to the present invention. In this embodiment, a lower flange 31 and an upper flange 32 of the rod bridge connecting device 30 are shown.
Has a width sufficient to pass through between the two screw rods 4 and 4 or the knurled rods 4'and 4 '. Other configurations are the same as those in FIG.

[0022]

As described above, according to the present invention, at least the width of the lower flange is such that it can pass between the two rods, so that the lower flange is assembled without separation. Can be placed directly below the two rods through the space between the two rods,
Also, by providing a protruding boss with a threaded hole on the inner surface of the lower flange and a recess for receiving the protruding boss on the inner surface of the upper flange, the length of the tightening screw connecting the upper flange and the lower flange can be increased. The upper flange and the lower flange can be widened in a state of being connected without being engaged, so that the tip of the tightening screw does not protrude below the lower surface of the lower flange.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a rod bridge connecting device of an anterior spinal correction device according to the present invention.

FIG. 2 is a cross-sectional view showing an attached state of a rod bridge connecting device of the anterior spinal correction device according to the present invention.

FIG. 3 is an exploded perspective view of another embodiment of the rod bridge connecting device of the anterior spinal correction device according to the present invention.

FIG. 4 is a view showing a state in which the rod bridge connecting device of the anterior spinal correction device according to the present invention is attached to the knurled rod.

5 is a perspective view of the rod bridge connecting device of FIG. 4. FIG.

FIG. 6 is a view showing a state in which a rod bridge connecting device of a conventional anterior spinal correction device is attached to a screw rod.

7 is a perspective view of the rod bridge connecting device of FIG. 6;

8 is an exploded perspective view of the rod bridge connecting device of FIG.

FIG. 9 is a side view of a vertebral body screw.

FIG. 10 is a view showing the arrangement of the anterior spinal correction device on the lateral side of the spinal cord.

FIG. 11 is a view showing the arrangement of the anterior spinal correction device on the anterior surface of the spinal cord.

[Explanation of symbols]

 4 Screw Rod 4'Knurled Rod 14 Tightening Screw 20 Rod Bridge Connecting Device 23 Upper Flange 23 Rod 24a Screw 26 Lower Flange 27 Lower Flange Projecting Boss 28 Upper Flange Recess

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[Procedure amendment]

[Submission date] June 16, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

FIG. 10 is a view showing the placement of the anterior spinal correction device on the lateral side of the spine.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 11

[Correction method] Change

[Correction content]

FIG. 11 shows an anterior spinal alignment of the anterior spinal correction device.

Claims (4)

[Claims] 1. An upper flange having rod engaging recesses on both sides of a screw insertion hole, a lower flange having rod engaging recesses on both sides of the screw hole, and a lower flange passing through a screw inserting hole of the upper flange. A rod bridge of the anterior spinal correction device that has a fastening screw that connects the upper flange and the lower flange by screwing into the screw hole, and bridge-links two rods that are inserted into the head of the vertebral body screw to each other. In the coupling device, at least the width of the lower flange is set to pass through between the two rods, the inner surface of the lower flange is provided with a projecting boss having a threaded hole connected to the above threaded hole, and the inner surface of the upper flange is provided. A rod bridge connecting device for an anterior spinal correction device, characterized in that a recess for receiving the protruding boss is provided. 2. The rod bridge connecting device for the anterior spinal correction device according to claim 1, wherein the width of the upper flange is set so as to pass through between the two rods. 3. The rod bridge connecting device of the anterior spinal correction device according to claim 1, wherein the rod is a threaded rod. 4. The rod bridge connecting device of the anterior spinal correction device according to claim 1, wherein the rod is a knurled rod.