CN101019787B - Physiological cervical vertebral reconstructing system - Google Patents

Abstract

The invention relates to a device for physiological reconstruction of the cervical spine after complete resection of cervical spine spines, especially a physiological reconstruction system for the cervical spine that can simulate normal cervical spine and restore the stability and activity of the cervical spine. It is characterized in that it is a symmetrical structure up and down, A vertebral body part (2) is connected between the upper and lower symmetrical fixing parts (1). The front wing part (4) of the fixing part has a fixing hole for fixing the cervical spine reconstruction system. The base part (5) of the fixing part is connected with the There is a ball head structure (6) in the center of the opposite side of the front wing portion (4) of the fixed part; the vertebral body part (2) is a symmetrical structure up and down, and its upper and lower surfaces have arc-shaped concave cavities (7); the vertebral body part ( 2) The two ends are movably socketed with the ball head structure (6) of the fixed part (1) respectively through the arc-shaped cavity (7) to form a ball-and-socket joint. It can restore the stability and mobility of the cervical spine in patients with total cervical spine resection, and realize the real physiological reconstruction.

Description

Cervical Physiological Reconstruction System

technical field

The invention relates to a device for performing physiological reconstruction of the cervical spine after complete resection of cervical spine spines, in particular to a physiological reconstruction system for the cervical spine which can simulate normal cervical spine and restore the stability and activity of the cervical spine.

Background technique

Clinically, for cervical fractures, degeneration, infection, or tumors, it is often necessary to perform cervical vertebral body resection, that is, the vertebral body is slotted to expose the spinal canal, and most of the vertebral body bone in the slotted area is removed. , part of the bone remains at both ends, and the upper and lower intervertebral discs are completely resected at the same time, and then the resected segments are reconstructed. At present, the common clinical reconstruction methods mainly include: segmental bone graft fusion and internal fixation and artificial vertebral body replacement. Segmental bone graft fusion and internal fixation, as the current standard method of cervical spine reconstruction, is to fill the defect segment with autologous or allogeneic bone tissue, and at the same time add internal fixation to reconstruct the stability of the cervical spine. This method achieves stable reconstruction of the cervical spine through bony fusion between the implanted bone and the upper and lower vertebral bodies, and eliminates pain, but this method completely loses the mobility of the reconstructed segment and affects the overall motion function of the cervical spine. It can also cause degeneration of adjacent segmental intervertebral discs due to stress concentration. Artificial vertebral body replacement is another common procedure. There have been many designs of artificial vertebral bodies, most of which reconstruct the stability of the cervical spine through bone graft fusion or self-fixation or additional internal fixation. There are also problems of loss of segmental motion and long-term degeneration of adjacent segmental intervertebral discs. Therefore, neither of these two methods is a true physiological reconstruction. A small number of artificial vertebral bodies designed with motion reconstruction in mind failed because their motion patterns were different from those under physiological conditions, or their stability was poor. For example, the elastically movable artificial vertebral body designed by Yuanlin in China uses the incision spring as the main body, and the prosthesis is fixed through the spikes on both ends of the platform. However, tests and clinical applications have shown that the stability of the prosthesis is insufficient, especially in extension and lateral bending movements, prone to prosthesis tilt and displacement (see references 1 and 2: [references] 1, clinical anatomy Journal. 1997, 15, 2: 149-1522; 2. Three cases of spinal fracture treated with movable artificial vertebral body replacement. Journal of Henan Medical University. 2000, 35, 2: 166); Exists in the intervertebral space, but exists in the entire replacement interval. To sum up, so far there is still no method that can take into account both stability and mobility, and truly realize the physiological reconstruction of the cervical spine. Only by completely "reconstructing" the intervertebral joints and vertebral bodies and restoring the range of motion of the intervertebral joints can the physiological reconstruction of the cervical spine be truly realized.

Contents of the invention

The purpose of the present invention is to provide a cervical spine physiological reconstruction system, which can restore the stability and activity of the cervical spine in patients who have undergone total cervical spine resection, and realize physiological reconstruction in the true sense.

The purpose of the present invention is achieved in this way, design a kind of cervical spine physiological rebuilding system, it is characterized in that: it is a symmetrical structure up and down, is connected with vertebral body part 2 between two symmetrical fixed parts 1 up and down, the front wing of fixed part Part 4 has a fixing hole for fixing the cervical spine reconstruction system. The base part 5 of the fixing part has a ball head structure 6 in the center of the side opposite to the front wing part 4 of the fixing part; There is an arc-shaped concave cavity 7 on the surface; the two ends of the vertebral body part 2 are respectively movably socketed with the ball head structure 6 of the fixed part 1 through the arc-shaped concave cavity 7 to form a ball-and-socket joint.

The vertebral body parts 2 are two vertebral body parts 2, and the two vertebral body parts 2 are connected into a vertebral body chain through a vertebral body connecting part 3. The head structure 6 is movably socketed with the arc-shaped cavity 7 to form a ball-and-socket joint.

The upper and lower end surfaces of the vertebral body connecting part 3 have ball head structures 6 respectively; the ball head structures 6 on the upper and lower end faces of the connecting part 3 are respectively movably socketed with the arc-shaped concave cavities 7 of the upper and lower fixing parts 1 to form a ball-and-socket joint .

The vertebral body part 2 is a vertebral body part 2, and the two ends of the vertebral body part 2 are respectively connected with the fixed part 1, and the connection form is a spherical joint structure 6 and an arc-shaped concave cavity 7 to form a ball-and-socket joint.

The front wing part 4 of the fixing part has 3 fixing holes, the 3 fixing holes are arranged in parallel, the oval holes 8 on both sides are used for installing the fixing screws 9, and the middle locking holes 10 are used for installing the locking screws 11.

The surface of the base part 5 of the fixing part 1 of the fixing part 1 opposite to the ball head structure 6 is evenly sprayed with a titanium porous coating 12 .

The vertebral body part 2 is a cuboid structure, the inner surface of the upper and lower arc-shaped cavity 7 is lined with a polyethylene plastic socket 13, and there are bone grafting holes 14 on both sides that penetrate the interior of the vertebral body part 2 to form a bone grafting channel. All the other parts have transverse serrated anti-skid grooves 15.

The ball-and-socket joint has a rotational range of 10-15 degrees in each direction.

The surface of the toothed linear groove 15 has a rough pearl surface.

The working principle of the cervical spine physiological reconstruction system of the present invention is: after it is implanted, a fixing screw is implanted into the adjacent normal vertebral body through the fixing hole of the front wing part 4 of the fixing component, and then in the locking hole, through the ring locking The plate is implanted with locking screws, which are locked until the edge of the plate is tightly pressed against the tail of the fixing screw, so as to obtain immediate stability of the fixation component 1; the titanium porous coating on the back side of the base part 4 ball head structure 6 induces bone ingrowth to achieve far stable period. The immediate stability of the vertebral body part 2 is achieved through the strong frictional force of the rough pearl surface on the side of the vertebral body part 2; the bone graft in the bone graft channel through the side is fused with the remaining part of the vertebral body at both ends after the total resection, As well as the bone ingrowth on the lateral pearl surface, the long-term stability of the vertebral body is obtained. Through the design of the arc-shaped cavity 7 of the vertebral body and the design of the ball-and-socket joint, it is difficult to dislocate the intervertebral joint and obtain stability.

The beneficial effect of the present invention is that it can restore the normal range of motion and activity pattern of cervical segments while rebuilding the stability of the cervical spine, and it can replace the current bone graft fusion method and become the standard method of clinical cervical vertebral body reconstruction. To restore the stability and mobility of the cervical spine to patients who have undergone total cervical spine resection, and to achieve real physiological reconstruction.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings of the embodiments.

Fig. 1 is a schematic sectional view of Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of Embodiment 2 of the present invention;

Fig. 3 is a schematic cross-sectional view of Embodiment 2 of the present invention;

Fig. 4 is the top view of fixed part;

Figure 5 is a schematic view of a vertebral body component;

Fig. 6 is the top view of vertebral body part;

Fig. 7 is a sectional view of a vertebral body part;

Fig. 8 is a sectional view of a connecting member.

In the figure: 1, fixed part; 2, vertebral body part; 3, vertebral body connecting part; 4, front wing of fixed part; 5, base of fixed part; 6, ball head structure; 7, arc-shaped cavity; , Oval hole; 9, Fixing screw; 10, Locking hole; 11, Locking screw; 12, Titanium porous coating; 13, Polyethylene plastic socket; 14, Bone graft hole; 15, Toothed anti-slip groove; 16, Ring locking plate.

Detailed ways

This cervical spine physiological reconstruction system has a symmetrical structure up and down. A vertebral body component 2 is connected between the upper and lower symmetrical fixing components 1. The front wings 4 of the fixing component have fixing holes for fixing the cervical spine reconstruction system. The part base part 5 has a ball head structure 6 at the center of the side opposite to the front wing part 4 of the fixed part; The ball and socket joints are respectively formed through the movable socket of the arc-shaped concave cavity 7 and the ball head structure 6 of the fixing part 1 .

The vertebral body part 2 fixed between the two fixing parts 1 can be two vertebral body parts 2, and the two vertebral body parts 2 are connected into a vertebral body chain through a vertebral body connecting part 3, and the two ends of the vertebral body chain are respectively It is connected with the fixed part 1, and the connection form is that the ball joint structure 6 is movably socketed with the arc-shaped cavity 7 to form a ball joint. The upper and lower end surfaces of the vertebral body connecting part 3 have ball head structures 6 respectively; the ball head structures 6 on the upper and lower end faces of the connecting part 3 are respectively movably socketed with the arc-shaped concave cavities 7 of the upper and lower fixing parts 1 to form a ball joint; The vertebral body part 2 between the two fixed parts 1 can also be a vertebral body part 2, and the two ends of the vertebral body part 2 are respectively connected with the fixed part 1, and the connection forms are ball head structure 6 and arc-shaped concave cavity 7 movable sleeves joint to form a non-dislocatable ball and socket joint. Ball and socket joint, allowing 10-15 degrees of rotational motion in each direction.

The front wing part 4 of the fixing part has 3 fixing holes, the 3 fixing holes are arranged in parallel, the oval holes 8 on both sides are used for installing the fixing screws 9, and the middle locking holes 10 are used for installing the locking screws 11. The surface of the base part 5 of the fixing part 1 of the fixing part 1 opposite to the ball head structure 6 is evenly sprayed with a titanium porous coating 12 .

The vertebral body part 2 is a cuboid structure, the inner surface of the upper and lower arc-shaped cavity 7 is lined with a polyethylene plastic socket 13, and there are bone grafting holes 14 on both sides that penetrate the interior of the vertebral body part 2 to form a bone grafting channel. All the other parts have transverse serrated anti-skid grooves 15. The surface of the toothed linear groove 15 has a rough pearl surface.

The embodiment will be further described below in conjunction with the accompanying drawings. Fig. 1 is a cross-sectional view of the vertebral body chain of the combination of two vertebral body parts in embodiment 1. The hole is used to fix the cervical spine reconstruction system. The base part 5 of the fixing part has a ball head structure 6 in the center of the side opposite to the front wing part 4. The ball head structure 6 is a protruding spherical shape as shown in the figure; two The vertebral body part 2 is a columnar structure, and its upper and lower bottom surfaces have arc-shaped concave cavities 7; the two vertebral body parts 2 are connected into a vertebral body chain through the vertebral body connecting part 3, and the upper and lower ends of the vertebral body connecting part 3 have ball heads respectively. Structure 6; the two ends of the vertebral body chain are respectively connected to the fixing part 1, and the connection form is a ball-and-socket joint formed by the ball head structure 6 and the arc-shaped cavity 7. The head and tail fixing parts 1 are respectively composed of a front wing part 4 of the fixing part, a base part 5 of the fixing part and a ball head structure 6 . The front wing part 4 of the fixing part has 3 holes arranged in parallel, the oval holes 8 on both sides are used for installing the fixing screw 9, and the middle locking hole 10 is used for installing the locking screw 11. The fixing screw 9 is inserted through the holes on both sides of the front wing part 4 of the fixing part, and the locking screw 11 is inserted through the middle locking hole 10 to prevent the fixing screw 9 from being pulled out, so that it is integrated with the ball head structure 6 . The base part 4 of the fixing part and the surface opposite to the ball head structure 6 are uniformly sprayed with a titanium porous coating 12 for bone ingrowth. The centers of the two ends of the vertebral body part 2 are respectively embedded with polyethylene plastic sockets 13 whose inner surfaces are ball-and-socket shapes, and the ball-head structure 6 is embedded in the ball-and-socket structure 7 to form a joint for universal movement. Between the two middle sides of the vertebral body part 2 is a bone grafting hole 14 of a transverse channel, which is used for bone grafting.

Fig. 2 shows the single-segment vertebral body reconstruction. The difference from Embodiment 1 is that the whole system consists of two fixation components 1 and a vertebral body component 2 in the middle. The head and tail fixing parts 1 are respectively composed of a front wing part 4 of the fixing part, a base part 5 of the fixing part and a ball head structure 6 . The front wing part 4 of the fixing part has 3 holes arranged in parallel, the oval holes 8 on both sides are used for installing the fixing screw 9, and the middle locking hole 10 is used for installing the locking screw 11.

Fig. 3 is a schematic cross-sectional view of Embodiment 2 of the present invention, which connects a vertebral body part 2 between two fixed parts 1, and fixation screws 9 are inserted through the holes on both sides of the front wing part 4 of the fixing part, and the locking screws 11 is placed through the middle locking hole 10 to prevent the fixing screw 9 from being pulled out, so that it is integrated with the ball head structure 6. The base part 4 of the fixing part and the surface opposite to the ball head structure 6 are uniformly sprayed with a titanium porous coating 12 for bone ingrowth. The centers of the two ends of the vertebral body part 2 are respectively embedded with polyethylene plastic sockets 13 whose inner surfaces are ball-and-socket shapes, and the ball head structure 6 is embedded in the ball-and-socket structure 7 to form joints, which can move in all directions. Between the two middle sides of the vertebral body part 2 is a bone grafting hole 14 of a transverse channel, which is used for bone grafting.

Fig. 4 is a top view of the fixing part 1 showing that the axial surface of the front wing part 4 of the fixing part has a certain radian, which can fit better with the front edge of the cervical vertebral body. The fixing screw 9 is arranged perpendicular to the front wing 4 of the fixing part. The annular locking plate is placed in the shallow part of the locking hole, and the edges are tightly pressed against the tails of the fixing screws 9 on both sides, and the locking screw 11 passes through the center of the annular locking plate 16 and is implanted in the locking hole.

Fig. 5 is a side view of the vertebral body part 2 and shows that the side of the vertebral body part 2 has a longitudinal tooth-shaped linear groove 15, which plays an anti-skid role. The middle is the side opening bone grafting hole 14 of the bone grafting pipeline. The side surface is uniformly sprayed with titanium porous coating 12 for bone ingrowth. Toothed anti-skid groove 15 surface and the rest of side are rough pearl face.

Fig. 6 is a top view of the vertebral body part 2, and the two sides of the vertebral body part 2 form serrated protrusions to form tooth-shaped anti-slip grooves 15, and the middle is an arc-shaped cavity 7 opening.

Fig. 7 is a front view sectional view of the vertebral body part 2, showing that the structure of the upper and lower polyethylene plastic sockets 13 of the vertebral body forms an arc-shaped cavity 7, and the middle is a lateral transverse bone graft hole 14.

FIG. 8 is a cross-sectional view of the vertebral body connecting part 3 showing that the vertebral body connecting part 3 has a vertically symmetrical ball head structure 6 .

The manufacturing materials of the invention are cobalt-chromium-molybdenum alloy metal and polyethylene vertebral plastic mortar.

The system is used in the following ways during surgery: 1. Thoracotomy is performed after exposing the lesion segment of the cervical spine routinely; 2. Endplate preparation: resecting the anterior 1/3 of the lower endplate of the upper vertebral body and the back of the upper endplate of the lower vertebral body 1/3 of the protruding bone, grinding the endplate until it fits perfectly with the base part 4 of the fixing part; 3. Implanting the fixing part 1: installing the upper and lower fixing parts 1, implanting the fixing screw 9 in the upper and lower vertebral bodies, and installing and locking Screw 11; 4. Implantation of vertebral body part 2: axially expand the defect gap, implant vertebral body part 2 between the remaining vertebral bodies on both sides of the surgical segment, and then reset the ball head structure 6 of the upper and lower fixing parts 1 into the Into the arc-shaped concave cavity 7 of the same side vertebral body part 2; 5. Implant the vertebral body connecting part 3: if the multi-segment vertebral body spines are completely resected, install the head and tail fixing part 1 and vertebral body part 2 according to the previous steps Finally, the vertebral body connecting part 3 is implanted between the two vertebral body parts 2, and the upper and lower ball head structures 6 are reset into the arc-shaped cavity 7 of the same-side vertebral body part 2; the installation of the system is completed.

What is not described in detail in the present invention is because the technical means commonly used by those skilled in the art are used, and some parts are commercially available external components, so no further description is given here.

Claims (2)

1. physiological cervical vertebral reconstructing system; It is a symmetrical structure up and down; Be connected with vertebral body parts (2) between two symmetric fixed parts (1) up and down; Fixed part forward wing (4) has fixing hole, is used for fixing physiological cervical vertebral reconstructing system, it is characterized in that: fixed part basilar part (5) has ball head structure (6) at the center with the relative side of fixed part forward wing (4); Vertebral body parts (2) are symmetrical structure up and down, and there is arc cavity (7) its upper and lower surfaces; Vertebral body parts (2) two ends form ball-and-socket joint through arc cavity (7) and fixed part (1) ball head structure (6) pivot bush unit respectively; Described vertebral body parts (2) are two vertebral body parts (2) or vertebral body parts (2); When described vertebral body parts (2) are two vertebral body parts (2); Two vertebral body parts (2) connect into the vertebral body chain through vertebral body link (3); Vertebral body chain two ends are connected with fixed part (1) respectively, and type of attachment is ball head structure (6) and forms ball-and-socket joint with arc cavity (7) pivot bush unit; When described vertebral body parts (2) were vertebral body parts (2), vertebral body parts (2) two ends were connected with fixed part (1) respectively, and type of attachment is ball head structure (6) and forms ball-and-socket joint with arc cavity (7) pivot bush unit; Described vertebral body parts (2) are rectangular structure; The inner surface liner vinyon mortar (13) of top and bottom arc cavitys (7); There is the inner bone grafting pipeline that forms of bone grafting hole (14) lateral direction penetrating vertebral body parts (2) two sides, and the two sides remainder has horizontal dentation anti-slip tank (15); Described vertebral body link (3) both ends of the surface up and down has ball head structure (6) respectively; Described fixed part forward wing (4) has 3 fixing holes, and 3 fixing holes are arranged in parallel, and the elliptical aperture of both sides (8) is as installing and fixing screw (9), and middle lock hole (10) is as lock screw (11) is installed; The fixed part basilar part (5) of described fixed part (1) evenly sprays titanium porous coating (12) with ball head structure (6) opposite face; There is coarse Margarita face on described horizontal dentation anti-slip tank (15) surface.

2. physiological cervical vertebral reconstructing system according to claim 1 is characterized in that: described ball-and-socket joint has the rotation mobility of 10-15 degree in all directions.

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