TWI405557B - Spiral rod connection device - Google Patents

Abstract

A vertebral rod connecting device includes a first connecting rod having at least one end as a joining end, in which the inner side and the outer side of the joining end near the rod end is substantially spheral shaped; a second connecting rod having at least one end as a joining end, in which the inner side and the outer side of the joining end near the rod end is substantially spheral shaped; a pad arranged between the two adjacent connecting rods; a first connecting cup having a connection mechanism at the cup opening edge, in which the inner side of the cup bottom is at least partially substantially spheral shaped, and the curvature of the spheral shape is slightly smaller or substantially equal to the curvature of the joining end of the first connecting rod near the rod end for being universally joined with the spheral shape of the outer side of the joining end of the first connecting rod near the rod end, and the cup bottom has a through hole for allowing the rod end of the first connecting rod to extend outside from inside of the connecting cup; and a second connecting cup having a connection mechanism at the cup opening edge, in which the inner side of the cup bottom is at least partially substantially spheral shaped, and the curvature of the spheral shape is slightly smaller or substantially equal to the curvature of the outer side of the joining end of the second connecting rod near the rod end for being universally joined with the spheral shape of the outer side of the second connecting rod near the rode end, and the cup bottom has a through hole for allowing the rod end of the second connecting rod to extend outside from inside of the cup, in which the connection mechanism at the cup opening edge of the first connecting cup and the connection mechanism at the cup opening edge of the second connecting cup are formed as a self connection.

Description

Spinal rod connecting device

The invention relates to a spinal rod connecting device, in particular to an adjustable angle spinal rod connecting device.

In the spinal fixation surgery, the fixed rod is often used as an auxiliary fixation device, but because the spine is not in a straight line, the vertebrae are usually not parallel, for example, the lumbar vertebra is lordosis. Therefore, if the fixed rod that is originally in line is directly integrated with the multiple bone nails implanted in the vertebral joint to be fixed, it will force the spinal joints to be fixed not in the straight line to become in a straight line, and the original should not be parallel. The individual vertebrae to be fixed become parallel.

In order to avoid these shortcomings, the medical community has proposed various improved structures, such as:

1. Solve problems with angled screws such as US-5,176,679, US-5,196,014, US-5,257,994, US-5,466,238, etc.; for example US-5,176,679 utilizes angled pins designed to have specific angles ,), to solve the above-mentioned spine joints are usually not parallel problems. However, these methods are only suitable for the fixation of the vertebrae between a fixed rod and two bone nails (because the two points are in line), but not for a fixed rod and three or more bones above the bone. Fixed because the three points are usually not in line. In addition, after the operation, the affected part does not have dynamic functions such as extension, flexion, lateral bending, and axial torsion. Wait for the buffer function.

2. Solve the problem with an angled connector, such as US-5,257,994, US-5,330,474, etc.; for example, US-5,257,994 utilizes locking blocks designed to have specific angles to solve the above-mentioned spine joints. Usually not parallel problems. However, these methods are only suitable for the fixation of the vertebrae between a fixed rod and two bone nails (because the two points are in line), but not for a fixed rod and three or more bones above the bone. Fixed because the three points are usually not in line. In addition, after the operation, the affected part does not have dynamic functions such as extension, flexion, lateral bending, and axial torsion. Wait for the buffer function.

3. Solve problems with a universal connecting device, such as US-5,474,551, US-5,507,746, US-5,575,791, etc.; for example, US-5,474,551 utilizes a universal pad fixation device. Solving the above-mentioned vertebrae is usually not a parallel problem. However, these methods are only suitable for the fixation of the vertebrae between a fixed rod and two bone nails (because the two points are in line), but not for a fixed rod and three or more bones above the bone. Fixed because the three points are usually not in line. In addition, after the operation, the affected part does not have dynamic functions such as extension, flexion, lateral bending, and axial torsion. Wait for the buffer function.

4. Solve problems with polyaxial screws, such as US approved patents US-5,520,690, US-5,531,746, ...US-7,186,2552, US-7,207,992, etc., and related publications in the United States Dozens of patent applications such as US-20010012937, US-20020111626, ..., US-20070161995, US-20070162006, etc. This is the current mainstream technology. These techniques basically utilize multi-axis screws (see the description of the details) to solve the problem that the above-mentioned vertebrae are usually not parallel.

However, the above methods are only applicable to the fixation of the vertebrae between a fixed rod and two bone nails (because the two points are in line), but not for a fixed rod and three or more bone bones. The section is fixed because the three points are usually not in line. In addition, after the procedure, the affected part does not have dynamic functions such as extension, flexion, lateral bending, and axial torsion. ) and buffer (cushion) function.

5. Solve the problem with an artificial joint fixture, such as TW-I275380 (see the case for details) to solve the problem that the above-mentioned vertebrae are usually not parallel.

These methods have dynamic functions such as extension, flexion, lateral bending, and axial torsion after surgery, but the design is poor in stability and has the risk of loosening. Sex also takes up a lot of space, and the design also has no cushioning function.

The inventor's Taiwan patent TW-200936097 utilizes a ball arc device and an elastic design to make the spinal fixation rod simultaneously have the above-mentioned dynamic functions such as extension, flexion, lateral bending, and torsion ( Axial torsion) and cushioning function, but the patent uses an additional coupling device to connect the first cup to the second cup, so that the spinal fixation device will require more space, so that the surgery is more Inconvenience and time consuming.

The invention adopts the ball arc mechanism with the ball arc mechanism and the ball joint mechanism of the first connecting rod and the second connecting rod combined end, so that the two adjacent connecting rods can be adjusted by the gasket with the ball arc mechanism. The purpose of the angle between adjacent connecting rods and the invention provides dynamic functions of extension, flexion, lateral bending, and axial torsion, and the present invention also utilizes an elastic mat. The design of the piece enables the spinal rod connecting device to have a cushion function at the same time, and the invention also adopts a design of self-joining between the two connecting cup bodies, thereby reducing the components required for the spinal rod connecting device and simultaneously reducing The space required is to solve the disadvantages of the inventor's Taiwan patent TW-200936097.

The invention can further limit the adjustable angle of the two adjacent connecting rods by the size of the perforations of the disc-shaped elastic piece, the connecting rod and/or the connecting cup body, so that the angle between the two adjacent connecting rods is not excessively large, thereby failing to be The structure of the connecting rod is reset or destroyed, thereby affecting the function of the bone fixing system.

It is an object of the present invention to provide a spinal rod coupling device.

Another object of the present invention is to provide a spinal rod coupling device having a spacer.

Still another object of the present invention is to provide a spinal rod coupling device having an elastic spacer.

It is still another object of the present invention to provide a spinal rod coupling device having a disk-shaped elastic piece.

Still another object of the present invention is to provide a spinal rod coupling device in which the coupling cup is self-joined.

Another object of the present invention is to provide a spinal rod coupling device that utilizes a ball-arc structure to form a universal joint.

Still another object of the present invention is to provide a spinal rod coupling device having an elastic function.

Still another object of the present invention is to provide an adjustable angle spinal rod coupling device.

It is still another object of the present invention to provide a spinal rod coupling device that has a limited degree of control adjustment.

Another object of the present invention is to provide a spinal rod coupling device having a dynamic function.

It is still another object of the present invention to provide a spinal rod coupling device having a cushioning function.

The spinal rod connecting device of the present invention comprises: a first connecting rod having at least one end thereof being a joint end, the inner side and the outer side of the joint end near the rod end being substantially a ball arc; and the second connecting rod having at least one end thereof a joint end, the inner side and the outer side of the joint end near the rod end are substantially spherical arcs; a gasket, wherein the gasket is placed between the two adjacent connecting rods; the first connecting cup body, the cup mouth of the cup body The end has a connecting mechanism, and at least a part of the inner side of the bottom of the cup is substantially spherical arc, and the arc curvature of the ball is slightly smaller than or substantially equal to the curvature of the ball outside the joint end of the first connecting rod near the rod end, The ball end of the first connecting rod is coupled to the outer side of the rod end in a universal direction, and the bottom of the cup body has a perforation for allowing the rod end of the first connecting rod to pass through the inside of the connecting cup body And a second connecting cup body, the cup end of the cup body has a connecting mechanism, and at least a portion of the inner side of the bottom portion of the cup body is substantially spherically curved, and the arc curvature of the ball is slightly smaller than or substantially equal to the second connecting rod The arc curvature of the outer side of the end near the end of the rod is used to The ball end of the joint end of the second connecting rod near the rod end is universally coupled, and the bottom of the cup body has a perforation for allowing the rod end of the second connecting rod to pass out from the inside of the connecting cup body to the outside. The cup end connection mechanism of the first connecting cup and the cup end connecting mechanism of the second connecting cup form a self-linking.

The self-linking of the connecting cups is connected to each other by a cup end connection mechanism of the first connecting cup and a cup end connecting mechanism of the second connecting cup to form a complete cup to reduce the spinal rod The structural complexity of the connecting device reduces the amount of space occupied by the spinal rod connecting device and further simplifies the complexity of the operation.

The self-linking of the connecting cups may be any conventional connection method such as a snap-fit connection, a screw connection, a lock connection, a snap connection or a node connection (please refer to FIGS. 4c and 4d).

The shape of the perforation of the connecting cup body is not limited, but a round hole is preferred, and the radius of the round hole is slightly larger than or equal to the radius of the round rod end of the connecting rod, so as to be slightly larger than the round rod of the connecting rod. Preferably, the end radius is such that the connecting rods can rotate universally in the perforations, and the magnitude of the rotation angle of the connecting rods can be limited by the size of the perforations.

In the above connecting rods, the two ends may be a joint end or only one end may be a joint end. The inner side of the connecting rod joint end may have an adjusting plane (see FIG. 2a), and the adjusting plane may be an adjusting plane having an inclined angle, so that the two adjacent connecting rods and the spacer can be limited by the adjusting plane. The angle of rotation between adjacent connecting rods is such that the angle of rotation between the two adjacent connecting rods is not too large, so that the structure of the connecting rod cannot be reset or broken, thereby affecting the function of the spinal rod connecting device.

The connecting rods may be integrally formed with the joint ends or integrated in any conventional combination (for example, snapping, screwing, locking, etc.). Among them, the connecting rods are similar to the conventional spinal rods, and are preferably round rods.

The ball joints of the connecting rods at the proximal end of the connecting rod and the inner side of the bottom of the connecting cups form a universal joint, so that the connecting rods can be opposite to each other by the arc surface of the connecting rod Rotate to achieve the purpose of adjusting the angle between two adjacent connecting rods (see Figure 2b).

The connecting rods have a ball arc mechanism on the inner side of the joint end near the rod end, and the ball arc mechanism may be a concave ball arc mechanism or a convex ball arc mechanism. The two adjacent connecting rods are combined with the inner ball arc mechanism at the end of the rod, which may be a convex ball arc mechanism to the convex ball arc mechanism (see FIG. 6), a concave ball arc mechanism to the convex ball arc mechanism or a concave ball arc. The mechanism is preferably a concave ball arc mechanism with a concave ball arc mechanism (see Fig. 2a).

The gasket is a gasket having a ball arc structure to match the inner ball arc mechanism at the proximal end of the first connecting rod and the second connecting rod, so that the two adjacent connecting rods can have the ball The gasket of the arc mechanism rotates universally, thereby achieving the purpose of adjusting the angle between the two adjacent connecting rods and/or having a dynamic function after being fixed (see Fig. 2b). The ball arc mechanism of the gasket may be a double convex ball arc mechanism, a double concave ball arc mechanism (please refer to FIG. 6 ) or a convex concave ball arc mechanism, and a double convex ball arc mechanism is preferred (refer to FIG. 3 a ) ).

The gasket may be any conventional gasket (as shown in FIGS. 3a and 3b) or an elastic gasket having an elastic function, and an elastic gasket having an elastic function is preferred. The elastic gasket is arranged between two adjacent connecting rods to provide a buffering function between the two adjacent connecting rods, so that the two adjacent connecting rods can slow down the two phases by the elastic spacers during postoperative activities. Instead of completely absorbing all the pressure from a healthy joint, it may accelerate the aging of adjacent joints.

The elastic gasket may be an elastic gasket (such as plastic, PE, UHMWPE, polymer, rubber or composite material, etc.) made of any conventional biocompatible elastomer material, or in any conventional manner. The elastic gasket has an elastic function, such as a spring piece, a disc-shaped elastic piece (refer to FIG. 3c) or a grooving method (refer to FIG. 3e) to form an elastic gasket with elastic function, and the elastic piece is preferably made of a metal elastic piece. .

The disc-shaped elastic piece may be any type of disc-shaped elastic piece, such as an integrally formed disc-shaped elastic piece or a two-piece disc-shaped elastic piece formed by two pieces of elastic pieces (refer to FIG. 3c), and the disc-shaped elastic piece may further Add an elastomer to enhance its elastic function (please refer to Figure 3d). Wherein the elastomer can be made of any conventional biocompatible elastomeric material (e.g., plastic, PE, UHMWPE, polymer, rubber or composite, etc.). The two-piece disc-shaped elastic piece can also be connected by any conventional connection method, such as screwing, snapping, locking or snapping.

The disc-shaped elastic piece can be adjusted by the disc portion to adjust the angle of the two adjacent connecting rods (refer to FIG. 2b), wherein the disc of the disc-shaped elastic piece can be a disc-shaped elastic piece with an inclined angle ( Please refer to FIG. 3b) to facilitate the angle adjustment between the disc-shaped elastic piece and the connecting rod, so that the angle between the two adjacent connecting rods is not too large to reset or destroy the connecting rod-disc spring-joining cup The problem of the inter-connected structure, in turn, affects the function of the spinal rod attachment device.

The spinal rod connecting device can be coupled to any conventional bone fixing device for fixing the connecting rod shaft of the spinal rod connecting device to the receiving portion of the bone fixing device (see FIG. 2a). The bone fixation device may be a conventional bone nail (which may be a mono-axial screw or a poly-axial screw), a bone-like fixation device (such as a bone hook-hook, etc.), and an auxiliary bone fixation device. (e.g., side block-side block, etc.), or a rotating bone nail (see another Taiwan patent TW-99100438 by the inventors), preferably a bone nail or a rotating nail. The manner in which the bone fixation device and the connecting rod are combined may be a fixed manner of a conventional fixing rod and a bone nail, a bone hook or a side block, such as direct screwing or snapping.

The bone fixing device can be coupled to the fixing device. The fixing device can be any conventional fixing device for engaging with the receiving portion of the bone fixing device, wherein the bonding manner can be any conventional fixing manner, such as locking and snapping. , screwing, etc., preferably by screwing.

The connecting rods are fixed to the receiving portion of the bone fixing device, and can be any conventional fixing manner, such as screwing and fixing (conventional bone nail and rod screwing), locking fixing or clamping Fixed, etc.

The bone fixation device, the connecting rod, the connecting cup, the gasket or the fixing device may be made of any approved or suitable orthopedic material, such as a metal material that can be implanted into the human body, such as an iron-based material stainless steel 316 LVM (stainless) Steel 316 LVM), titanium-based material Ti-6Al-4V, and cobalt-chromium-molybdenum alloy.

The connecting rods may further be provided with a connecting sleeve for connecting two adjacent connecting rods (please refer to FIG. 5), and the distance between the two adjacent connecting rods is adjusted by the connecting sleeve to match the different intervertebral spaces. Pitch.

1 is an exploded perspective view of a preferred embodiment of a spinal rod connecting device of the present invention. The first connecting rod 310 and the second connecting rod 320 respectively pass through the first connecting cup body 110 and the second connecting cup body 120 , and the elastic spacer 200 is placed between the first connecting rod 310 and the second connecting rod 320 . Since the outer ends 311 and 321 of the first connecting rod 310 and the second connecting rod 320 are larger than the through holes of the first connecting cup 110 and the second connecting cup 120, the first connecting rod 310 and the second connecting rod 320 are Will not slip out of the connecting cup. The first connecting cup 110 and the second connecting cup 120 cover the first connecting rod 310, the second connecting rod 320 and the elastic spacer 200 in the connecting cup body by the self-connecting mechanism, so that the first connecting cup body 110 The concave arc mechanism (refer to FIG. 5) of the inner end 313, 323 of the joint end of the connecting rod 310 and the second connecting rod 320 can be matched with the ball arc mechanism 210 of the elastic spacer 200 to make the connecting rod and the elastic The spacers 200 are relatively rotatable to adjust the angle between the connecting rods (please refer to FIG. 2b), and further utilize the elasticity of the elastic spacers 200 to provide a buffering function between the two adjacent connecting rods, so that the patient can During postoperative activities, the two adjacent connecting rods can relieve the impact of the two adjacent connecting rods by the elastic spacer 200. The elastic spacers 200 and/or the through holes 111 and 121 of the connecting cups are sized to limit the adjustable angle of the two adjacent connecting rods, so that the angle between the two adjacent connecting rods is not excessively large and cannot be reset or destroyed. The structure of the connecting rod further affects the function of the spinal rod connecting device. The outer side 311 of the first connecting rod 310 near the rod end and the outer side 321 of the second connecting rod 320 are ball arcs, so that the ball arc mechanism connecting the rods on the inner side of the bottom of the cup body can be made by the ball between each other The arc surface is relatively rotated to achieve the purpose of adjusting the angle between the two adjacent connecting rods.

2a is a cross-sectional view showing a preferred embodiment of the spinal rod connecting device of the present invention. The connecting cup 100 covers the first connecting rod 310, the elastic spacer 200 and the second connecting rod 320, so that the joint end of the first connecting rod 310 and the second connecting rod 320 is close to the concave arc of the inner side 313, 323 at the rod end. The mechanism can cooperate with the ball arc mechanism 210 of the elastic spacer 200 to be rotatable with each other to adjust the angle between the connecting rods (please refer to FIG. 2b). The first connecting rod 310 and the second connecting rod 320 respectively have an adjusting plane 312, 322, so that the angle between the connecting rod and the elastic spacer 200 can be restricted by the adjusting plane. The holder 500 fixes the connecting rod shaft in the receiving portion 420.

Figure 2b is a schematic view showing the rotation of the connecting rod of Figure 2a.

3a, 3b, 3c, 3d, and 3e are schematic views showing a preferred embodiment of five types of elastic spacers for the fastening device of the spinal fixation system of the present invention. FIG. 3a shows that the ball arc mechanism 210 of the elastic spacer 200 is in contact with the inner ball arc mechanism at the proximal end of the coupling rod (refer to FIG. 2a), and the elastic spacer 200 is made by the spherical arc surface of the ball arc mechanism 210. The function of adjusting the angle is achieved with the connecting rod, and the adjustable angle of the connecting rod is further restricted by the disc portion 220, so that the connecting rod is not an infinite adjustment angle, so as to ensure that the angle between the two adjacent connecting rods is not excessive. It is too large to be reset, which in turn affects the function of the spinal rod connecting device. Figure 3b shows that the disc portion 220 has an angle of inclination to limit the angle of two adjacent connecting rods. FIG. 3c shows that the elastic spacer 200 is formed by combining the first elastic piece 230 and the second elastic piece 240. The first elastic piece 230 and the second elastic piece 240 are coupled by a fastening manner. FIG. 3d shows that the elastic spacer 200 is formed by combining the first elastic piece 230 and the second elastic piece 240. An elastic body 250 is placed between the first elastic piece 230 and the second elastic piece 240, and the two adjacent connecting rods and the connecting cup body are utilized. The first elastic piece 230, the second elastic piece 240 and the elastic body 250 are placed between two adjacent connecting rods. Figure 3e shows that the elastomeric shim 200 has a groove 260 that provides the resilient shim 200 with a resilient function.

4a, 4b, 4c, and 4d are schematic views showing a preferred embodiment of four types of connecting cups of the spinal rod connecting device of the present invention. 4a shows that the first coupling cup 110 and the second coupling cup 120 are screwed together. FIG. 4b shows that the first connecting cup body 110 and the second connecting cup body 120 are coupled to each other by engagement. 4c shows that the connecting cup 100 is covered with the connecting rod and the elastic spacer 200 from the side by the two-node joint 130, and is fixed by the engaging manner. 4d shows that the connecting cup 100 is covered with the connecting rod and the elastic spacer 200 from the side by a single-node joint 140, and is fixed by engagement.

Fig. 5 is a schematic view showing a preferred embodiment of the multi-segment connecting rod of the spinal rod connecting device of the present invention. The first connecting rod 310 and the sleeve 360 are screwed together and adjusted in length, wherein the second rod 320 is coupled to the sleeve 350 like the first connecting rod 310 and the sleeve 360. The inner side 313 of the first connecting rod 310 near the rod end and the inner side 323 of the second connecting rod 320 are concave spherical arc mechanism, so that the connecting rod can be connected to the cup body by the concave ball mechanism and elasticity of the connecting rod The spacer 200 is relatively rotated to achieve the purpose of adjusting the angle between the two adjacent connecting rods.

Fig. 6 is a schematic view showing another preferred embodiment of the multi-segment connecting rod of the spinal rod connecting device of the present invention. The first connecting rod 310 and the sleeve 360 are screwed together and adjusted in length, wherein the second rod 320 is coupled to the sleeve 350 like the first connecting rod 310 and the sleeve 360. The inner side 313 of the first connecting rod 310 and the inner side 313 of the second connecting rod 320 are a convex arc mechanism, so that the connecting rod can be connected to the cup by the convex arc mechanism of the connecting rod and the double The arcuate surface of the concave elastic spacer 700 is relatively rotated to achieve the purpose of adjusting the angle between the two adjacent connecting rods.

Fig. 7 is a schematic view showing a preferred embodiment of the spinal rod connecting device of the present invention assembled to the joint. The device of the present invention is placed on the vertebra joint, and the elastic spacer 200 is placed between two adjacent connecting rods for adjusting the angle of the two adjacent connecting rods.

FIG. 8 is a schematic view of another view of FIG. 7.

100. . . Link cup

110. . . First connecting cup

111. . . perforation

120. . . Second connecting cup

121. . . perforation

130. . . Two-node link

140. . . Single node link

200. . . Elastic gasket

210. . . Ball arc mechanism

220. . . Disc department

230. . . First shrapnel

240. . . Second shrapnel

250. . . Elastomer

260. . . Trench

310. . . First connecting rod

311. . . Near the outer end of the rod

312. . . Adjustment plane

313. . . Near the inside of the rod end

320. . . Second connecting rod

321. . . Near the outer end of the rod

322. . . Adjustment plane

313. . . Near the inside of the rod end

330. . . Third connecting rod

350. . . Sleeve

360. . . Sleeve

410. . . Screw section

420. . . Undertaking department

500. . . Holder

610. . . joint

620. . . joint

630. . . joint

700. . . Double concave elastic gasket

1 is an exploded perspective view of a preferred embodiment of a spinal rod connecting device of the present invention.

2a is a cross-sectional view showing a preferred embodiment of the spinal rod connecting device of the present invention.

Figure 2b is a schematic view showing the rotation of the connecting rod of Figure 2a.

3a, 3b, 3c, 3d, and 3e are schematic views showing a preferred embodiment of five types of elastic spacers for the fastening device of the spinal fixation system of the present invention.

4a, 4b, 4c, and 4d are schematic views showing a preferred embodiment of four types of connecting cups of the spinal rod connecting device of the present invention.

Fig. 5 is a schematic view showing a preferred embodiment of the multi-segment connecting rod of the spinal rod connecting device of the present invention.

Fig. 6 is a schematic view showing another preferred embodiment of the multi-segment connecting rod of the spinal rod connecting device of the present invention.

Fig. 7 is a schematic view showing a preferred embodiment of the spinal rod connecting device of the present invention assembled to the joint.

FIG. 8 is a schematic view of another view of FIG. 7.

100. . . Link cup

110. . . First connecting cup

111. . . perforation

120. . . Second connecting cup

121. . . perforation

200. . . Elastic gasket

210. . . Ball arc mechanism

310. . . First connecting rod

311. . . Near the outer end of the rod

320. . . Second connecting rod

321. . . Near the outer end of the rod

323. . . Near the inside of the rod end

Claims (7)

A spinal rod connecting device comprises: a first connecting rod, at least one end of which is a joint end, the inner side and the outer side of the joint end near the rod end are substantially spherical arcs; and the second connecting rod has at least one end of the joint end The inner side and the outer side of the joint end near the rod end are substantially spherical arcs; a gasket, wherein the gasket is placed between the two adjacent connecting rods; the first connecting cup body has a cup end of the cup body a connecting mechanism, at least a portion of the inner side of the bottom of the cup is substantially spherically curved, and the arc curvature of the ball is slightly smaller than or substantially equal to the curvature of the outer side of the first connecting rod at the proximal end of the rod, for The ball end of the first connecting rod is joined to the outer side of the rod end in a universal joint, and the bottom of the cup body has a through hole for the rod end of the first connecting rod to pass out from the inside of the connecting cup body to the outside And a second connecting cup body, the cup end of the cup body has a connecting mechanism, and at least a portion of the inner side of the bottom portion of the cup body is substantially spherical arc shape, and the arc curvature of the ball is slightly smaller than or substantially equal to the combination of the second connecting rod The curvature of the outer ball at the end of the rod near the end of the rod, and The ball end of the joint end of the second connecting rod near the rod end is universally coupled, and the bottom of the cup body has a perforation for allowing the rod end of the second connecting rod to pass out from the inside of the connecting cup body to the outside. The cup end connection mechanism of the first connecting cup and the cup end connecting mechanism of the second connecting cup form a self-linking. The spinal rod connecting device according to claim 1, wherein the spacer is an elastic spacer. The spinal rod connecting device according to claim 2, wherein the elastic spacer is a disc-shaped elastic piece. The spinal rod connecting device according to claim 3, wherein the disc-shaped elastic piece is a two-piece disc-shaped elastic piece or an integrally formed disc-shaped elastic piece. The spinal rod member connecting device according to any one of claims 3 to 4, wherein the disc-shaped elastic piece is a disc-shaped elastic piece having an elastic body. The spinal rod coupling device of claim 1, wherein the self-linking is snapping or screwing. The spinal rod connecting device according to claim 1, wherein the joint end of the first connecting rod and the second connecting rod has an adjusting plane.