JP2002355252A - Crosslink device for spinal column correction rods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cross link for spinal column correction rods which can easily mount the cross link device even when rods are equipped in a shape widened toward the ends. SOLUTION: A rod engaging member 2 is engaged with one rod B and combined with a movable sphere 3 which is combined with one end side of the cross link body 4. A seat part 41 comprising two facing pieces 42, 42 is formed on one end side of the cross link body 4 and clamps the movable sphere 3. On the other hand, the cross link body 4 is engaged with the other rod B by a second engaging means (groove 61) equipped on the other end side of the cross link body 4. By fastening a clamp screw 5 combined with the movable sphere 3, the movable sphere 3 can be immovably fixed in between facing pieces 42, 42 of the cross link body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-linking device for a vertebral correction rod used for holding a pair of vertebral correction rods juxtaposed at a predetermined interval for holding vertebrae in a desired spatial arrangement. Things.

[0002]

2. Description of the Related Art Conventionally, in order to correct a vertebra, a correction operation using two or more spine correction devices and rods assembled on a bone fixing screw has been performed. In this correction, the vertebral correction device is screwed into the vertebral pedicle,
Each of these vertebral correction devices is moved to a desired position with a dedicated instrument, and in this state, the vertebrae are fixed in a predetermined position by connecting the vertebral correction devices with a rod.

[0003] In such a vertebra correction, two rods are juxtaposed along the vertebral body and on the right and left vertebrae. A problem that often occurs in this case is that the distance between the rods gradually increases, and the effect of the vertebrae correction becomes weaker.

[0004] As a countermeasure to this problem, an instrument called a cross link device is used, and two rods are connected by this instrument so that the interval between the rods is not widened.

The conventional cross link device has a substantially plate-like rod body, and includes a hook at each end thereof for engaging with a rod, and two clamp screws which can be inserted and removed with respect to each hook to prevent the rod from coming off. In addition, in the center of the crosslink device, a mechanism for changing the length of the device and a clamp screw for continuously maintaining the length were provided.

[0006]

However, when the above two rods are used, when these rods are not completely parallel, for example, when they are installed in a C-shape,
In the above-mentioned conventional crosslink device, it was necessary to bend the central portion. This is because the hooks for engagement with the rods at both ends of the cross link device were formed in parallel with each other, and this bending work was very troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cross-link device which can be easily mounted even when a pair of rods are arranged in a C-shape.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a cross-linking device for a spinal correction rod according to the present invention is provided.
A rod engaging member having a first engaging member at a base thereof is engaged with one of the rods, and a rod-like portion extending from the base of the rod engaging member is formed in a diameter direction of a substantially spherical movable sphere. The rod engaging member and the movable sphere are combined by being inserted into the divided through hole, and the combined movable sphere is sandwiched between two opposed pieces formed on one end side of the cross link body. The second linking means provided on the other end side of the cross link body engages with the other rod, and the clamp screw is screwed into a threaded hole communicating with the split through hole of the movable sphere. By fastening, the tip of this clamp screw pushes down the rod-shaped part of the rod engaging member to press the rod-shaped part against the wall surface of the split through hole of the movable sphere, and the pressed part of the movable sphere is Expand Pressing the seat of the cross-linked body, thereby characterized in that the rod engaging member and the movable spherical body, and a movable spherical body and the cross-linked body connecting.

According to this configuration, before the fastening of the clamp screw to be combined with the movable sphere, the movable sphere is variable in direction with respect to the cross link body, and in this state, the movable sphere corresponds to the positional relationship between the two rods. By adjusting the direction of the movable sphere and then tightening the clamp screw, the crosslink device can be easily mounted even if the rods are juxtaposed in a C shape.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 4, reference numeral 1 denotes a cross link device, 2 denotes a first rod engaging member, 3 denotes a movable sphere, 4 denotes a cross link body, 5 denotes a clamp screw, and 6 denotes a second rod engaging member. The first rod engaging member 2 has a groove 21 as a first engaging means, and the second rod engaging member 6 has a groove 61 as a second engaging means. In the cross link device 1, the first rod engaging member 2 is engaged with one rod B, and the first rod engaging member 2 is
And the movable sphere 3 is combined with one end side of the cross link body 4. On the other hand, the second engaging member 6 is engaged with the other rod B, and the second engaging member 6 is combined with the other end of the cross link body 4.

Then, as described later, the movable sphere 3 is immovably fixed between the opposing pieces 42 of the connecting member by fastening the clamp screw 5 combined with the movable sphere 3 as described later. On the other hand, when the clamp screw 5 is not fastened, the movable sphere 3 is variable in direction, and the direction of the movable sphere 3 can be adjusted with respect to the positional relationship between the two rods B. Have been.

The first rod engaging member 2 includes a base 22 having a groove 21 for engaging with one of the rods B;
2 and a slit 24 communicating with the groove 21 and extending to the tip of the rod. The rod 23 is combined with the movable sphere 3 described below.

As shown in FIG. 4, the movable sphere 3 has a substantially spherical shape as a whole, and has an allocation through-hole 31 and a screw hole 32. The allocation through-hole 31 is formed in the diameter direction of the ball, and the screw hole 32 is orthogonally and communicates with the allocation through-hole 31 from the outer surface. The screw hole 32 opens on the outer surface on the side opposite to the split slit 33 provided in the split through hole 31.

The rod portion 23 of the first rod engaging member 2 can be inserted into the allocation through hole 31. The clamp screw 5 is screwed into the screw hole 32. And
The tip of the clamp screw 5 can press the rod 23 inserted into the split through hole 31. In the present embodiment, the clamp screw 5 has a hexagonal hole 51 at one end. By fitting a hexagon wrench into the hexagon hole 51, the work of tightening the clamp screw 5 can be performed.

The cross link body 4 has, at one end, a seat 41 for receiving the movable sphere 3, two opposing pieces 42, 42 constituting the seat 41, and these opposing pieces 42, 4.
A spherical holding surface 4 for holding the movable sphere 3 on the side opposite to 2
3 and 43.

In the cross-link main body 4, a rod-shaped end opposite to the opposing pieces 42, 42 has a hole 44 opened in the end face thereof and extending in the axial direction, and a screw hole communicating with the hole 44. 45 are drilled. In this hole 44,
A rod 63 provided in the second rod engaging member 6 described next.
Can be inserted. Further, the clamp screw 5 is screwed into the screw hole 45, and the tip of the clamp screw 5 can press the rod-shaped portion 63 of the second rod engaging member 6.

The second rod engaging member 6 has the same structure as the first rod engaging member 2 in the present embodiment. That is, the groove 61 engaged with the other rod B
, A bar 63 extending from the base 62, and a split slit 64 communicating with the groove 61 and extending to the tip of the bar 63.

The crosslink device 1 configured as described above
In the above, the clamp screw 5 screwed into the screw hole 32 communicating with the split through hole 31 of the movable sphere 3 is fastened so that the tip of the clamp screw 5 becomes a rod-shaped portion of the first rod engaging member 2. 23, the rod-shaped portion 23 is pressed against the wall surface of the allocated through-hole 31 of the movable sphere 3, and the pressed portion of the movable sphere 3 is enlarged to press the seat 41 of the cross-link main body 4. Accordingly, the first rod engaging member 2, the movable sphere 3, and the movable sphere 3
And the cross link body 4 are connected. At this time, since the split slit 24 provided in the first rod engaging member 2 is narrowed, the wall surface of the groove 21 of the first rod engaging member 2 grips the rod B.

On the other hand, when the clamp screw 5 combined with the screw hole 45 formed therein is fastened at the end of the cross link body 4 opposite to the seat portion 41, the tip of the clamp screw 5 becomes The rod-shaped portion 63 of the second rod engaging member 6 inserted into 44 is pushed down to press the rod-shaped portion 63 against the wall surface of the hole 44. Thus, the cross link body 4 and the second rod engaging member 6 are connected. At this time, the second rod engaging member 6 is
By the action of 4, the wall surface of the groove 61 holds the rod B.

The length adjustment of the crosslink device 1 is as follows.
The fixing can be performed by appropriately selecting the fixing positions of the rod portions 23 and 63 of the rod engaging members 2 and 6.

According to such a configuration of the crosslink device 1 of the present invention, as described above, the crosslink device 1 can be easily fixed even between the two rods B arranged in a C-shape. In addition, since the length of the cross link device 1 can be adjusted using the lengths of the two rod portions 23 and 63, the length can be adjusted to a large length. Conventionally, three clamp screws were required.
The operation of maintaining the length of the cross link device 1 and holding the two rods can be performed by tightening the two clamp screws.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment. For example, the cross link device 1 is replaced with the second rod engaging member 6 and the second link
It may have an engaging means. In this case, the length of the cross link device 1 is adjusted only by adjusting the fixed position of the rod 23 of the first rod engaging member 2, and the width of the adjustment is reduced. There is an advantage that the mechanism is simplified.

In any case, any form can be adopted without departing from the object of the invention.

[0025]

As described above, the crosslink device for correcting a vertebrae according to the present invention engages a rod engaging member having a first engaging means at its base with one of the rods. The rod-shaped member extending from the base is inserted into an allocation through hole formed in the diameter direction of a movable sphere having a substantially spherical shape, and the rod engaging member and the movable sphere are combined. The cross-link body is sandwiched between two opposed pieces formed at one end of the cross-link body, and a clamp screw screwed into a screw hole communicating with the split through hole of the movable sphere is fastened. Since the rod engaging member and the movable sphere are connected to each other, and the movable sphere and the cross link body are connected to each other, the movable sphere can be cross-linked before the clamp screw combined with the movable sphere is fastened. The direction of the movable sphere is variable with respect to the main body. In this state, the direction of the movable sphere is adjusted in accordance with the positional relationship between the two rods. Even if provided, the crosslink device can be easily mounted.

[Brief description of the drawings]

FIG. 1 is a front view of a cross link device for a vertebral bone correcting rod according to the present invention.

FIG. 2 is a bottom view of the cross link device of FIG. 1;

FIG. 3 is a perspective view of the cross link device of FIG. 1;

FIG. 4 is a perspective view of a movable sphere constituting the crosslink device of FIG. 1;

[Explanation of symbols]

1. Cross-link device for vertebra bone correction rod 2. First rod engaging member, 21 first engaging means (groove),
22, base portion, 23, rod portion 24, split slit 3, movable sphere, 31, split through hole, 32, screw hole,
33 · Split slit 4 · Cross link body, 41 · Seat, 42 · Opposing piece, 4
3, spherical holding surface 44, hole, 45, screw hole 5, clamp screw, 51, hexagonal hole 6, second rod engaging member, 61, second engaging means (groove),
62 ・ Base, 63 ・ Bar-shaped part 64 ・ Split slit B ・ Rod

Claims (2)

[Claims] A cross-linking device for a vertebral correction rod for holding a pair of side-by-side vertebral correction rods at a predetermined interval, wherein a rod engaging member having a first engaging means at a base thereof is provided on one side. The rod-shaped member extending from the base portion of the rod-engaging member is inserted into a through hole formed in the diameter direction of the movable sphere having a substantially spherical shape, and the rod-engaging member is engaged with the rod-engaging member. A second engaging means provided on the other end side of the cross link body, wherein the combined movable sphere is sandwiched between two opposite pieces of a seat formed on one end side of the cross link body; By engaging a clamp screw that is screwed into a screw hole that communicates with the split through hole of the movable sphere, the tip of the clamp screw becomes the rod engaging member. The rod-shaped part is pushed down to press the rod-shaped part against the wall surface of the split through hole of the movable sphere, and the pressed part of the movable sphere expands to press the seat of the cross-link main body, thereby A cross-link device for a vertebral bone correction rod, wherein the rod engaging member and the movable sphere, and the movable sphere and the cross-link main body are connected. 2. The cross-link main body, wherein the second engaging means is formed on a second engaging member separate from the cross-link main body, and the second engaging member and the cross-link main body are connected to the cross-link main body. 2. A spine correction rod cross according to claim 1, wherein a rod-like portion extending from the base of the second engaging member is inserted into a hole formed on the other end side of the second engaging member and fastened with a clamp screw. Link device.