CN201996692U - Interbody fusion device - Google Patents

Abstract

The utility model relates to a fusion device between vertebral bodies, which relates to an orthopedic surgery internal plant. The device has a hollow titanium alloy skeleton for containing broken bones. The skeleton is similar to a U-shaped plate. There is a stepped oblique hole on each side, the large ends of the two oblique holes are located on the bottom surface of the bottom, and the small ends of the two oblique holes are respectively located on the corresponding end surfaces of the bottom; the two oblique holes of the U-shaped plate Thread the screws separately. Small size, less vertebral body resection, more reliable fusion, and can reduce patient bleeding and maintain the blood supply of the vertebral body. It can prevent bone graft fragments from entering the spinal canal and causing secondary nerve compression. The collapse phenomenon can be avoided. It is convenient for doctors to observe the growth of callus and the fusion between vertebral bodies.

Description

A kind of interbody fusion device

technical field

The utility model relates to an orthopedic surgery internal plant.

Background technique

In order to repair the injured and damaged vertebral bodies, foreign medical circles have invented artificial vertebral bodies, such as titanium cages (TMC). The titanium cage is a hollow skeleton made of titanium alloy, which is surrounded by a titanium alloy plate with multiple mesh holes, and is equipped with a ring-shaped support inside. When in use, the injured and damaged vertebral body needs to be subtotal cut, and the injured and damaged vertebral body should be chiseled into an empty shell with open sides; then a titanium cage filled with broken bones should be put into it. The point-shaped protrusions at the two ends of the titanium cage respectively withstand the lower end surface of the previous vertebral body and the upper end surface of the next vertebral body. With the growth of the injured and damaged vertebral body, the broken bones in the titanium cage eventually grow into a whole with the upper and lower vertebral bodies; and small blood vessels can pass through the mesh of the titanium cage to accompany the growth of the bone. So as to achieve the therapeutic effect of vertebral body fusion.

However, the titanium cage also has the following disadvantages: 1. The shape of the titanium cage determines that its cylindrical volume is huge. In order to implant it into the injured and damaged vertebral body, when performing subtotal resection, on the one hand, the patient has a lot of bleeding, and on the other hand On the other hand, it will destroy the blood supply of the vertebral body. 2. The titanium cage only relies on the point-like protrusions at both ends to withstand the upper vertebral body and the next vertebral body, which is prone to collapse. 3. Bone grafting is not allowed around the titanium cage, and the titanium cage does not have the function of blocking the spinal canal. The bone graft in the titanium cage may re-enter the spinal canal and compress the nerve. 4. The titanium cage encloses the newborn bone; during the imaging examination, the titanium cage will block the rays, making it difficult for the doctor to observe the growth of the callus.

Utility model content

The utility model aims to provide a fusion device between vertebral bodies, which can avoid the above-mentioned shortcomings of the titanium cage.

The technical scheme of the utility model is: a fusion device between vertebral bodies, which has a hollow titanium alloy skeleton for containing broken bones, the skeleton is a U-shaped plate, the rear vertical wall of the U-shaped plate has no holes, and the front vertical wall has a A plurality of holes; the upper and lower sides of the bottom of the U-shaped plate respectively have a stepped oblique hole, the large ends of the two oblique holes are located on the bottom surface of the bottom, and the small ends of the two oblique holes are respectively located on the corresponding bottom surface of the bottom. on the end face of the U-shaped plate; the two oblique holes of the U-shaped plate are respectively threaded with screws.

The outer circumference of the tail caps of the two screws is an arc surface, and the junction of the big end and the small end of each oblique hole of the U-shaped plate is an arc segment, and the arc surface matches the arc segment. No matter how the nailing angles of the two screws change, the arc surfaces of the two screw end caps can always be in close contact with the arc segments of the corresponding oblique holes of the U-shaped plate. The locking force of the U-shaped plate of the two screw pairs can thus be maintained.

The outer surface of the rear vertical wall of the U-shaped plate is provided with a slope along the free end, and the outer surface of the front vertical wall is provided with a slope along the free end. A guiding part for facilitating the insertion of the U-shaped plate is provided for placing the U-shaped plate in the operation.

The rear vertical wall, the front vertical wall and the upper and lower ends of the bottom of the U-shaped plate are respectively opened into racks. The rack can increase the frictional force between the U-shaped plate and the previous vertebral body and the next vertebral body, thereby improving the stability of the U-shaped plate.

The upper and lower ends of the U-shaped plate are parallel or non-parallel. The upper and lower ends of the U-shaped plate are designed to be parallel to the endplate of the thoracic vertebral body; the upper and lower ends of the U-shaped plate are designed with slopes to better fit the endplate of the lumbar vertebral body; It can prevent excessive local pressure from causing collapse, upper and lower lumbar vertebral fractures, etc.

The utility model intervertebral fusion device (also can be referred to as U-shaped artificial vertebral body), uses two screws to lock the U-shaped plate with a thickness of 0.6cm made of titanium alloy on the upper vertebral body of the injured vertebra and between the next vertebrae. Both the inside and the front of the U-shaped plate can be grafted, and the amount of bone grafting is large, which is easy to form a biological connection. The size of the U-shaped plate is small, and the injured and damaged vertebral body does not need subtotal resection. It only needs to resect the posterior third of the vertebral body, and the anterior column and part of the central column are retained. Most of the bone in the vertebrae, while reducing bleeding in patients, maintains the blood supply of the vertebral body, which is beneficial to the bony fusion of the anterior and middle parts of the injured vertebrae. The rear wall of the U-shaped plate has no holes, which can act as a gate to prevent bone graft fragments from entering the spinal canal, thereby causing secondary nerve compression. There are multiple holes in the front wall of the U-shaped plate, which are easy to form biological connections, and small blood vessels can pass through these holes to accompany the growth of bones. The U-shaped plate is respectively threaded with screws in the upper and lower oblique holes on the bottom, and the screws are locked into the end plates of the upper vertebral body and the lower vertebral body, which can reduce the collapse of the internal plant. During imaging examination, by observing the healing of the anterior 2/3 of the injured vertebra, the state of vertebral body fusion can be visually evaluated.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of an embodiment of the interbody fusion device of the present invention.

Fig. 2 is a schematic diagram of the three-dimensional structure of the U-shaped plate in the embodiment of Fig. 1 .

Fig. 3 is a schematic view of the structure of the U-shaped plate viewed from the bottom in the embodiment of Fig. 1 .

Fig. 4 is a schematic cross-sectional structure diagram of the U-shaped plate in the embodiment of Fig. 1 .

Fig. 5 is a schematic diagram of the three-dimensional structure of the screw in the embodiment of Fig. 1 .

Fig. 6 is a schematic diagram of the use state of the embodiment in Fig. 1 .

Fig. 7 is a schematic diagram of the three-dimensional structure of the second embodiment of the interbody fusion device of the present invention.

Fig. 8 is a schematic diagram of the three-dimensional structure of the U-shaped plate in the embodiment of Fig. 7 .

Fig. 9 is a schematic structural diagram of the U-shaped plate viewed from the bottom in the embodiment of Fig. 7 .

FIG. 10 is a schematic cross-sectional structure diagram of the U-shaped plate in the embodiment of FIG. 7 .

FIG. 11 is a schematic view of the use state of the embodiment in FIG. 7 .

Detailed ways

1. Embodiment 1

An optimized embodiment of the intervertebral body fusion device of the utility model is used for repairing lumbar vertebrae. The three-dimensional structure of the present embodiment, as shown in Figure 1, it is made up of a U-shaped plate 1 and two screws 2.

U-shaped plate 1 is to make the hollow skeleton that thickness is 0.6cm with titanium alloy, its structure, please refer to Fig. 2. The rear vertical wall 11 and the front vertical wall 12 of the U-shaped plate 1 are integrated by the bottom 14 . The upper and lower two ends of the U-shaped plate 1 are not parallel, and there is an included angle forming a slope. The rear vertical wall 11 of U-shaped plate 1, the upper end of front vertical wall 12 and bottom 14 are opened into tooth bar 13. The rear vertical wall 11 of U-shaped plate 1, the lower end of front vertical wall 12 and bottom 14 are opened into tooth bar 15. The rear vertical wall 11 , the front vertical wall 12 and the bottom 14 of the U-shaped plate 1 surround an inner groove 16 .

A slope 111 is formed on the outer surface of the rear wall 11 of the U-shaped plate 1 along the free end. A rear groove 112 extending to the edge is formed in the middle portion of the rear vertical wall 11 close to the bottom 14 .

Please come back and look at Fig. 1: a slope 121 is formed on the outer surface of the front wall 12 of the U-shaped plate 1 along the free end. A front groove 122 extending to the edge is formed in the middle part of the front vertical wall 12 near the bottom 14 . A plurality of small round holes 123 are evenly distributed on the front vertical wall 12 .

The slope 111 on the rear wall 11 of the U-shaped board 1 and the slope 121 on the front wall 12 provide a guide for placing the U-shaped board 1 during operation. The rear groove 112 on the rear vertical wall 11 of the U-shaped board 1 and the front groove 122 on the front vertical wall 12 provide a clamping portion for clamping the U-shaped board 1 with tweezers during the operation.

Please refer to FIG. 3 : a stepped oblique hole 141 is formed on the upper and lower sides of the bottom 14 ; the angle between the axis of each oblique hole 141 and the normal line of the bottom 14 is 50°. The big ends of the two inclined holes 141 are located on the bottom surface of the bottom 14 , and the small ends of the two inclined holes 141 are located on the corresponding end surfaces of the bottom 14 respectively. The junction between the big end and the small end of each inclined hole 141 is treated as an arc segment 1411 . There is a threaded hole 142 in the middle of the bottom 14, so that an auxiliary hand-held rod can be installed in the operation, and the U-shaped plate 1 is put into the excavated position of the injured and damaged vertebral body.

Screw 2 is made of titanium alloy, and its structure, please refer to Fig. 5. The front end of the nail body 21 of the screw 2 is provided with a tapered threaded portion 22, which can be easily screwed into the bone and has good anti-exit performance; the rear end of the nail body 21 is provided with a tail cap 23. Please refer to Fig. 1, have hexagonal jack 231 on the end face of end cap 23, to adapt to the high hexagonal screwdriver of safety in the operation. The outer circumference of the tail cap 23 is processed into an arc surface 232, which matches the arc segment 1411 of the oblique holes 141 at both ends of the bottom 14 of the U-shaped plate 1 .

Please refer to Figure 6 for the usage status of this embodiment of the intervertebral fusion device: During the operation, a longitudinal groove that can accommodate the U-shaped plate 1 is dug at the rear edge of the injured and damaged lumbar vertebral body 3, and the injured and damaged lumbar vertebra can be retained during the groove. Anterior column 31 and part of the central column of the vertebral body. Put the broken bones into the inner groove 16 of the U-shaped plate 1, and observe the filling status of the broken bones through each small round hole 123 on the front vertical wall 12, and adjust it so that the broken bones fill the inner groove 16 of the U-shaped plate 1 . Hold the rear groove 112 on the rear vertical wall 11 of the U-shaped plate 1 and the front groove 122 on the front vertical wall 12 with tweezers, so that the free end of the rear vertical wall 11 of the U-shaped plate 1 and the free end of the front vertical wall 12 are facing the injured and damaged The longitudinal groove on the lumbar vertebral body 3 puts the U-shaped plate 1 filled with broken bones into the excavated longitudinal groove of the injured and damaged lumbar vertebral body 3 . The front vertical wall 12 of the U-shaped plate 1 faces the front column 31, and the front of the front vertical wall 12 can be implanted into a bone so as to form a biological connection. The rear vertical wall 11 of the U-shaped plate 1 faces the spinal canal, and the rear vertical wall 11 can prevent broken bones of injured vertebrae and bone grafts from entering the spinal canal. The racks 13 and 15 at the upper and lower ends of the U-shaped plate 1 bear against the lower end surface of the upper lumbar vertebral body 4 and the upper end surface of the next lumbar vertebral body 5 respectively. Use two screws 2 to pass through the corresponding inclined holes 141 on the upper and lower sides of the bottom of the U-shaped plate 1, and make the two screws 2 protrude from the upper and lower ends of the U-shaped plate 1 respectively. The tapered threaded part 22 of 2 is respectively locked on the lower part of the previous lumbar vertebral body 4 and the upper part of the next lumbar vertebral body 5; The arc segment 1411 of the hole 141 is in close contact. Two screws 2 lock the U-shaped plate 1 between the upper lumbar vertebral body 4 and the next lumbar vertebral body 5 .

Two, embodiment two

The second optimized embodiment of the intervertebral body fusion device of the present utility model is used for repairing the thoracic vertebrae. The three-dimensional structure of this embodiment, as shown in FIG. 7 , consists of a U-shaped plate 6 and two screws 2 . The structure of the screw 2 is the same as the screw 2 of the previous embodiment, and will not be repeated here.

U-shaped plate 6 is the hollow skeleton of 0.6cm with the thickness that titanium alloy is made, and its structure, please refer to Fig. 8 and figure. The rear vertical wall 61 and the front vertical wall 62 of the U-shaped plate 6 are connected into one body by the bottom 64 . The upper and lower ends of the U-shaped plate 6 are parallel. The upper and lower ends of the U-shaped plate 6 are not designed with slopes, which can better fit the end plates of the thoracic vertebral body. The upper and lower ends of the rear vertical wall 61 , the front vertical wall 62 and the bottom 64 of the U-shaped plate 6 are respectively opened into racks 63 . The rear vertical wall 61 , the front vertical wall 62 and the bottom 64 of the U-shaped plate 6 enclose an inner groove 65 .

A slope 611 is formed on the outer surface of the rear vertical wall 61 along the free end. A rear groove 612 extending to the edge is formed in the middle portion of the rear vertical wall 61 near the bottom 64 .

A slope 621 is formed on the outer surface of the front standing wall 62 along the free end. A front groove 622 extending to the edge is formed in the middle portion of the front vertical wall 62 near the bottom 64 . Four long holes 623 are evenly distributed on the front vertical wall 62 .

The slope 611 on the rear wall 61 of the U-shaped board 6 and the slope 621 on the front wall 62 provide a guide for placing the U-shaped board 6 during the operation. The rear groove 612 on the rear wall 61 of the U-shaped board 6 and the front groove 622 on the front wall 62 provide a clamping portion for clamping the U-shaped board 6 with tweezers during the operation.

Please refer to FIG. 10 : the upper and lower sides of the bottom 64 of the U-shaped plate 6 respectively have a stepped oblique hole 641; the angle between the axis of each oblique hole 641 and the normal line of the bottom 64 is 50°. The big ends of the two inclined holes 641 are located on the bottom surface of the bottom 64 , and the small ends of the two inclined holes 641 are respectively located on the corresponding end surfaces of the bottom 64 . The junction between the big end and the small end of each inclined hole 641 is treated as an arc segment 6411 . The arc section 6411 of the oblique hole 641 at both ends of the bottom 64 of the U-shaped plate 6 matches the arc surface 232 of the outer circumference of the tail cap 23 of the screw 2 . There is a threaded hole 642 in the middle of the bottom 64 of the U-shaped plate 6, so that an auxiliary hand-held stick can be installed during the operation, and the U-shaped plate 6 can be put into the excavated position of the damaged thoracic vertebral body by using the hand-held stick. .

Please refer to Fig. 11 for the usage status of this embodiment of the intervertebral body fusion device: during the operation, a longitudinal groove for accommodating the U-shaped plate 6 is excavated at the rear edge of the injured and damaged thoracic vertebral body 7, and the injured and damaged thoracic vertebral body can be retained during the groove. The front post 71 and part of the post of the body. Put the crushed bones into the inner groove 65 of the U-shaped plate 6, and observe the filling condition of the crushed bones through the elongated hole 623 on the front vertical wall 62, and adjust it. Hold the rear groove 612 on the rear wall 61 of the U-shaped plate 6 and the front groove 622 on the front wall 62 with tweezers, so that the free end of the rear wall 61 of the U-shaped plate 6 and the free end of the front wall 62 are towards the wounded and damaged The longitudinal groove on the thoracic vertebral body 7 puts the U-shaped plate 6 filled with broken bones into the excavated longitudinal groove of the damaged thoracic vertebral body 7 . The front vertical wall 62 of the U-shaped plate 6 faces the front column 71, and the front of the front vertical wall 62 can be implanted into a bone so as to form a biological connection. The rear vertical wall 61 of the U-shaped plate 6 faces the spinal canal, and the rear vertical wall 61 can prevent broken bones of injured vertebrae and bone grafts from entering the thoracic vertebral canal. The racks 63 at the upper and lower ends of the U-shaped plate 6 respectively withstand the lower end surface of the upper thoracic vertebral body 8 and the upper end surface of the next thoracic vertebral body 9 . Two screws 2 respectively pass through the oblique holes 641 corresponding to the bottom of the U-shaped plate 6, and protrude outward from the upper and lower ends of the U-shaped plate 6, and the tapered threaded parts 22 of the two screws 2 are respectively locked on the upper The lower part of the thoracic vertebral body 8 and the upper part of the next thoracic vertebral body 9; the arc surface 232 of the two screw 2 tail caps 23 is in close contact with the arc section 6411 of the corresponding oblique hole 641 of the U-shaped plate 6. Two screws 2 lock the U-shaped plate 6 between the upper thoracic vertebral body 8 and the next thoracic vertebral body 9 .

The above is only a preferred embodiment of the utility model, and does not limit the scope of implementation of the utility model. Equivalent changes and modifications made according to the technical solution of the utility model and the content of the specification should all belong to the utility model range covered.

Claims (5)

1. A fusion device between vertebral bodies has a hollow titanium alloy skeleton for holding broken bones, and is characterized in that: the skeleton is a U-shaped plate, the rear vertical wall of the U-shaped plate does not have holes and the front vertical wall has a plurality of Holes; the upper and lower sides of the bottom of the U-shaped plate have a stepped oblique hole, the large ends of the two oblique holes are located on the bottom surface of the bottom, and the small ends of the two oblique holes are respectively located on the corresponding end surfaces of the bottom. on; the two oblique holes of the U-shaped plate are respectively threaded with screws. 2. A kind of intervertebral fusion device according to claim 1, characterized in that: the tail caps of the two screws are arc-shaped, and the big end of each oblique hole of the U-shaped plate is in contact with the The junction of the small ends is an arc segment, and the arc surface matches the arc segment. 3. The intervertebral body fusion device according to claim 1 or 2, characterized in that: the outer surface of the rear vertical wall of the U-shaped plate is provided with a slope along the free end, and the outer surface of the front vertical wall is provided with a slope along the free end. 4. The intervertebral body fusion device according to claim 1 or 2, characterized in that: the rear vertical wall, the front vertical wall, and the upper and lower ends of the bottom of the U-shaped plate are respectively opened into racks. 5. The interbody fusion device according to claim 1 or 2, characterized in that: the upper and lower ends of the U-shaped plate are parallel or non-parallel.

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