TWI383773B - Spinal fixation system - Google Patents

Description

Spinal fixation system

The present invention relates to a spinal fixation system, and more particularly to an adjustable angle spinal fixation system.

In the spinal fixation, 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. Solving 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 using angled nails (locking 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 a straight line. Moreover, after the procedure, the affected part does not have the function of bending/twisting/stretching.

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 a straight line. Moreover, after the procedure, the affected part does not have the function of bending/twisting/stretching.

3. Solving 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 a straight line. Moreover, after the procedure, the affected part does not have the function of bending/twisting/stretching.

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 knot is fixed because the three points are usually not in a straight line. Moreover, after the procedure, the affected part does not have the function of bending/twisting/stretching.

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

However, these methods also solve the problem of fixation of the vertebrae between the two bone nails, and cannot solve the problem of fixation of the spine joints above the three (inclusive) nails, and the ball joint of the upper rod (the case number 10) is connected in the case. The combination of the body (the reference numeral 102) and the ball joint (the reference numeral 111) connecting the lower rod (the case number 11) has no restriction mechanism, which causes the connection of the upper rod (the case number 10) and the connection. The angle between the lower rod (the case number 11) is not fixed, that is, the fixing effect is poor. Moreover, these methods do not have the function of twisting/stretching after the surgery.

The invention utilizes the adjusting gasket so that the two adjacent connecting rods can adjust the angle, and the angle of the opening of the receiving portion of the spacer and/or the bone fixing device is adjusted to limit the adjustable angle of the two adjacent connecting rods, so that the two The angle between adjacent bonding rods is not too large, so that the structure of the bonding rod cannot be reset or broken, thereby affecting the function of the bone fixing system, and the present invention can be used to adjust the spacer between two adjacent bonding rods. Elastic, allowing the two adjacent joint rods to have twisting/stretching/cushion/flexion/posture by elastically adjustable spacers during postoperative activities The function of extension/lateral bending.

It is an object of the present invention to provide a spinal fixation system.

Another object of the present invention is to provide a spinal fixation system having an adjustment pad.

It is still another object of the present invention to provide a spinal fixation system having elasticity.

Still another object of the present invention is to provide an adjustable angle spinal fixation system.

Still another object of the present invention is to provide a dynamic spinal fixation system.

Another object of the present invention is to provide a compressible spinal fixation system.

Still another object of the present invention is to provide a spinal fixation system with limited control adjustment angles.

It is still another object of the present invention to provide a spinal fixation system having a rotating screw.

The spinal fixation system of the present invention comprises: a plurality of bone fixation devices, wherein the proximal end is a joint end, and the distal end thereof is used for fixing a spine joint to be fixed, wherein the joint end has a receiving portion; an adjusting gasket; And a plurality of coupling rods, wherein the adjusting gasket is arranged between two adjacent coupling rods, and the adjusting gasket and the coupling rod are placed in the receiving portion of the bone fixing device, and are fixed by the fixing devices In the receiving part of the bone fixation device.

The adjusting gasket can be any shape of the adjusting gasket, and a flying saucer-like or flying saucer-like adjusting gasket (refer to FIG. 4a, 4b) is preferred, and the adjusting gasket is provided by the disc portion (please Referring to FIG. 2b), the angle between the two adjacent joint rods is limited, wherein the disc of the adjusting washer can be a disc having an inclined angle to facilitate the angle adjustment between the adjusting washer and the joint rod. The angle between the two adjacent coupling rods is too large to be reset, thereby affecting the function of the bone fixation system.

The adjusting pad can be an elastic adjusting pad, so that the two adjacent connecting rods have elasticity between the two adjacent connecting rods, so that the two adjacent connecting rods can be adjusted by the elastic adjusting gasket. It relieves the impact of the two adjacent rods, rather than all the pressure from the unoperated joint.

The adjusting gasket can be any conventional elastic adjusting gasket, such as a metal elastic adjusting gasket or an elastic material filled in a metal elastic adjusting gasket, such as plastic (polyurethane, polyoxyl Or PEEK), polymer, rubber or composite (meaning that it is made of two or more materials).

The bone fixation device described above may be any conventional bone fixation device having a groove, such as a bone nail (which may be a mono-axial screw or a poly-axial screw), a bone-like fixation device. (e.g., bone hook-hook, etc.), or an auxiliary fixture (e.g., side block-side block, etc.), wherein a nail is preferred. The combination with the bonding rod and the adjusting pad can 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 coupling rod has a groove structure at both ends (refer to FIG. 2a) for contacting the convex portion of the flying saucer-shaped adjusting gasket, so that the adjustment gasket and the coupling rod are more favorable for adjusting the angle ( Please refer to Figure 2b). The coupling rod may have a groove structure at both ends or only one end has a groove structure, wherein the groove structure and the coupling rod may be integrally formed or joined in any conventional combination, such as screwing, snapping, and locking. Or nailing, etc., is preferably formed integrally.

The connection between the bone fixation device and the coupling rod and the adjustment pad may be any conventional connection method, such as a screw connection (a traditional bone nail and a rod screw connection), a locking connection or a snap connection. A spacer may be further disposed between the bone fixation device and the coupling rod to strengthen the connection between the bone fixation device and the coupling rod and the adjustment gasket.

In the above nail, the screw portion may be a rotating screw (please refer to FIG. 5a, 5b, 5c, 5d), wherein the rotating screw is used to adjust the angle of the nail receiving portion, and the nail and the rotating screw may further There is a fixing mechanism to facilitate fixing the bone nail and the rotating screw after adjusting the angle of the nail receiving portion. The fixing mechanism may be any conventional fixing mechanism, such as a groove engaging and fixing mechanism (refer to FIG. 5b), a crack pressing fixing mechanism (refer to FIG. 5c), or a groove-crack pressing fixing mechanism ( Please refer to Figure 5d). The conventional mono-axial screw is integrally formed by the screw portion and the receiving portion. Therefore, after the uniaxial bone nail is driven into the joint, the uniaxial bone nail must be rotated to conform to the angle at which the rod is placed, resulting in an operation time. Many inconveniences. In order to achieve maximum rotation and adjustment angle, the coupling between the receiving portion and the screw portion of the nail is relatively unstable, so that the receiving portion and the screw of the nail are relatively stable. Some parts are more fragile when subjected to external forces, and cannot be connected to the receiving part as the rotating screw of the present invention, which can effectively strengthen the relationship between the two and improve the stability. For details, descriptions, implementations and examples of the rotating screw and the fixing function mechanism, please refer to another patent application "orthopedic rotating bone nail" applied by the inventor on the equivalent date (where the acceptance part of the patent is similar to the " "Rolling bone nails for orthopedics" in the patent seat). Among them, the bone nails are preferably uniaxially rotated bone nails, and the fixed single-axis rotating bone nails with a fixed function mechanism are more preferable.

The fixing device may be any conventional fixing device for combining with the receiving portion of the bone fixing device, wherein the bottom of the fixing device is preferably a spherical arc concave surface for making the connection of the spinal fixation system more stable. The bonding mode may be any conventional fixing manner, such as locking, snapping, screwing, etc., preferably by screwing.

The bone fixation device, the fixture, the coupling rod and the adjusting gasket can 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-6-4, and cobalt-molybdenum alloy.

The coupling rod can be sized and configured to be assembled between two adjacent vertebrae, and the coupling rod can also be adjusted in length by the forward and reverse screw sleeve structure to match two adjacent vertebrae. The distance between them. In addition to the materials mentioned above, the bonding rod can also be made of a biocompatible material, such as plastic (polyurethane, polyfluorene or PEEK), polymer, rubber or composite material (that is, two or more kinds) Made of materials). When determining the bond rod to be used, various factors may be considered including, but not limited to, the ability to withstand sterilization, the ability to withstand the forces applied thereto, weight, durability, elastic and plastic bending, and/or deformation. The ability, and the ability to maintain shape after deformation.

In addition to the materials mentioned above, the above-mentioned adjusting gasket can also be made of a biocompatible material, such as plastic (polyurethane, polyfluorene or PEEK), polymer, rubber or composite material (that is, by two or two Made of the above materials). When determining the manufacturing of the conditioning pad, various factors may be considered including, but not limited to, resistance to sterilization, ability to withstand the forces applied thereto, weight, durability, flexibility and plastic bending, and/or The ability to deform and the ability to retain shape after deformation.

1 is a schematic view showing a preferred embodiment of the spinal fixation system of the present invention. The reference numeral 110 is a first coupling rod, 111 is a blocking portion, 120 is a second coupling rod, 121 is a blocking portion, 122 is a groove, 200 is an adjusting gasket, 210 is a convex portion, and 220 is a disc portion, 300 For the nail, 310 is the receiving part, and 330 is the holder. An adjusting spacer 200 is disposed between the first coupling rod 110 and the second coupling rod 120, and the barrier portion 111 of the adjusting spacer 200 and the first coupling rod 110 and the blocking portion 121 of the second coupling rod 120 are placed in the bone. The receiving portion 310 of the nail 300 limits the adjustable angle of the first coupling rod 110 and the second coupling rod 120, and limits the first coupling rod 110 and the first portion by adjusting the disc portion 220 having the inclined angle of the spacer 200. The two coupling rods 120 can adjust the angle without causing the angle between the first coupling rod 110 and the second coupling rod 120 to be too large to be reset, thereby affecting the function of the spinal fixation system.

2a is a schematic cross-sectional view showing a preferred embodiment of the spinal fixation system of the present invention. Wherein the reference numeral 110 is the first coupling rod, 111 is the blocking portion, 120 is the second coupling rod, 121 is the blocking portion, 200 is the adjusting gasket, 210 is the convex portion, 220 is the disc portion, 300 is the bone nail, 310 To undertake the department. The adjusting portion of the adjusting rod 250 and the blocking portion 111 of the first coupling rod 110 and the second coupling rod 120 are placed in the receiving portion 310 of the bone nail 300 to restrict the adjustment of the first coupling rod 110 and the second coupling rod 120. Angle, and by adjusting the disc portion 220 having the inclined angle of the spacer 200, limiting the adjustable angle of the first coupling rod 110 and the second coupling rod 120 without causing the first coupling rod 110 to be combined with the second The angle between the rods 120 is too large to be reset, thereby affecting the function of the spinal fixation system.

Figure 2b is a schematic view of the adjustment angle of the coupling rod of Figure 2a. Its label is similar to Figure 2a.

3a and 3b are schematic views showing a preferred embodiment of two types of coupling rods of the spinal fixation system of the present invention. Reference numeral 110 is a first joint rod, 111 is a blocking portion, 113 is a joint end, 114 is a joint end, 115 is a joint device, 120 is a second joint rod, 121 is a blocking portion, 123 is a joint end, and 124 is a joint end. , 125 is the joint device, and 200 is the adjustment gasket. FIG. 3a shows that the connecting end 114 of the first coupling rod 110 and the connecting end 113 of the blocking portion 111 are screwed together, and the connecting end 124 of the second coupling rod 120 and the connecting end 123 of the blocking portion 121 are screwed. Linked by way. FIG. 3b shows that the first coupling rod 110 and the blocking portion 111 and the second coupling rod 120 and the blocking portion 121 are respectively connected by rivets by means of a joint device 115, 125.

4a and 4b are schematic views showing a preferred embodiment of two types of adjusting pads of the spinal fixation system of the present invention. Reference numeral 200 is an adjustment spacer, 210 is a convex portion, and 220 is a disc portion. 4a shows that the convex portion 210 of the adjusting spacer 200 is in contact with the rod end of the coupling rod (refer to FIG. 2a), and the adjustment surface of the adjusting portion 200 and the coupling rod is adjusted by the curved surface of the convex portion 210. Further, the disc portion 220 is further limited to adjust the angle of the joint rod, so that the joint rod is not an infinite degree of adjustment angle, so as to ensure that the angle between the two adjacent joint rods is not too large to be reset, thereby affecting the The function of the bone fixation system. Figure 4b shows that the disc portion 220 has an angle of inclination to limit the angle of the two adjacent engaging bars.

5a, 5b, 5c, and 5d are schematic views showing a preferred embodiment of four kinds of rotating screws of the spinal fixation system of the present invention. The reference numeral 300 is a bone nail, 310 is a receiving portion, 320 is a rotating screw, and 321 is a rotating end. FIG. 5a shows that the rotating end 321 of the rotating screw 320 and the receiving portion 310 are mutually rotatable, and the angle between the receiving portion 310 and the rotating screw 320 is adjusted by the mutual rotation to adjust the angle of the receiving portion 310. Can meet the position of the rod placement. FIG. 5b shows that the rotating end 321 of the rotating screw 320 and the receiving portion 310 are mutually rotatable, and the angle between the receiving portion 310 and the rotating screw 320 is adjusted by the mutual rotation to adjust the angle of the receiving portion 310. Can meet the position of the rod placement. The rotating end 321 has a groove engaging and fixing mechanism, so that when the rotating screw 320 is rotated to a suitable angle, the rotating screw 320 and the receiving portion 310 can be fixed by the groove engaging and fixing mechanism. FIG. 5c shows that the rotating end 321 of the rotating screw 320 and the receiving portion 310 are mutually rotatable, and the angle between the receiving portion 310 and the rotating screw 320 is adjusted by the mutual rotation to adjust the angle of the receiving portion 310. Can meet the position of the rod placement. The rotating end 321 has a crack pressing and fixing mechanism, so that when the rotating screw 320 is rotated to a suitable angle, the rotating screw 320 and the receiving portion 310 can be fixed by the crack pressing and fixing mechanism. FIG. 5d shows that the rotating end 321 of the rotating screw 320 and the receiving portion 310 are mutually rotatable, and the angle between the receiving portion 310 and the rotating screw 320 is adjusted by the mutual rotation to adjust the angle of the receiving portion 310. Can meet the position of the rod placement. The rotating end 321 has a groove-crack pressing and fixing mechanism, so that when the rotating screw 320 is rotated to a suitable angle, the rotating screw 320 and the receiving portion 310 can be fixed by the groove-crack pressing and fixing mechanism.

Fig. 6 is a schematic view showing a preferred embodiment of the spinal fixation system and device of the present invention. Wherein the reference numeral 110 is the first joint rod, 120 is the second joint rod, 130 is the third joint rod, 140 is the fourth joint rod, 200 is a disc-shaped adjustment washer, 300 is a bone nail, 410 is a first joint, 410 For the second joint, 430 is the third joint. The spinal fixation system is disposed on the spinal joint, and the disc-shaped adjustment pad 200 is placed between two adjacent hollow fixing rods for adjusting the angle of the two adjacent hollow fixing rods.

Figure 7 is a schematic view of another view of Figure 6. Its label is similar to Figure 6.

110. . . First tie rod

111. . . Blocking

113. . . Link end

114. . . Link end

115. . . Jointing device

120. . . Second binding rod

121. . . Blocking

122. . . Groove

123. . . Link end

124. . . Link end

125. . . Jointing device

130. . . Third hollow fixing rod

140. . . Fourth hollow fixing rod

200. . . Disc adjusting washer

210‧‧‧ raised parts

220‧‧‧Disc Department

300‧‧‧ bone nails

310‧‧‧Receiving Department

320‧‧‧Rotating screws

321‧‧‧Rotary end

330‧‧‧Retainer

410‧‧‧Bone Festival

420‧‧‧ bone joint

430‧‧‧Bone Festival

1 is a schematic view showing a preferred embodiment of the spinal fixation system of the present invention.

2a is a schematic cross-sectional view showing a preferred embodiment of the spinal fixation system of the present invention.

Figure 2b is a schematic view of the adjustment angle of the coupling rod of Figure 2a.

3a and 3b are schematic views showing a preferred embodiment of two types of coupling rods of the spinal fixation system of the present invention.

4a and 4b are schematic views showing a preferred embodiment of two types of adjusting pads of the spinal fixation system of the present invention.

5a, 5b, 5c, and 5d are schematic views showing a preferred embodiment of four kinds of rotating screws of the spinal fixation system of the present invention.

Fig. 6 is a schematic view showing a preferred embodiment of the spinal fixation system and device of the present invention.

Figure 7 is a schematic view of another view of Figure 6.

110. . . First tie rod

111. . . Blocking

120. . . Second binding rod

121. . . Blocking

122. . . Groove

200. . . Adjusting washer

210. . . Raised portion

220. . . Disc department

300. . . Bone nail

310. . . Undertaking department

330. . . Holder

Claims (8)

A spinal fixation system comprising: a plurality of bone fixation devices, wherein a proximal end is a joint end, and a distal end thereof is used for fixing a spine joint to be fixed, wherein the joint end has a receiving portion, wherein the bottom of the receiving portion is a ball arc a concave surface; a disc-shaped adjusting gasket; a plurality of holders, wherein the bottom of the holder is a spherical arc concave surface; and a plurality of coupling rods having at least one end having a blocking portion, the outer side of the blocking portion being substantially a spherical arc convex surface, The inner side of the blocking portion is substantially a spherical arc concave surface, wherein two adjacent connecting rods are arranged to adjust the gasket, and the adjusting gasket and the connecting rod are placed in the receiving portion of the bone fixing device, and are fixed by the fixing device. In the receiving part of the bone fixation device. The spinal fixation system of claim 1, wherein the bone fixation device is a bone nail. The spinal fixation system of claim 2, wherein the screw portion of the nail is a rotating screw. The spinal fixation system of claim 1, wherein the disc-shaped adjustment pad is an elastic dish-shaped adjustment pad. The spinal fixation system according to claim 4, wherein the elastic disc-shaped adjusting gasket is a metal dome-shaped disc adjusting gasket or a hollow metal Shrapnel disc adjustment pad. The spinal fixation system of claim 5, wherein the elastic disc-shaped adjustment pad is a hollow metal elastic disc-shaped adjustment pad filled with an elastic material. The spinal fixation system of claim 1, wherein the disc-shaped adjustment pad is further a disc-shaped adjustment pad having a disc with an inclined angle. The spinal fixation system of claim 1, wherein the coupling rod is adjustable in length by using a forward and reverse screw sleeve structure.