Fusion device capable of being openedTechnical Field
The invention belongs to the technical field of medical appliances, and particularly relates to an expandable fusion device for a vertebra.
Background
The spine is the "column of life" of mammalian vertebrates, especially upright walking humans that stand out in evolutionary evolution of object competition. Life undergoes occurrence, development, decline and death under the general rule of metabolism, and the cycle is repeated; the spine, which is the "column of life", is necessarily governed by this law. Thus, attenuation degeneration is a process that the spine in each living individual must undergo after the peak of young and young life.
Cases of vertebral body damage may occur due to various causes of tumors, fractures, infections, and the like. In the treatment of these patients, a method of implanting a fusion cage body between damaged vertebral bodies is currently adopted to enable bone tissues to creep for replacement, so that damaged vertebral bodies are repaired, however, the traditional vertebral body fusion cage body is highly fixed, the height of the intervertebral body of the human body is different from person to person, the requirements of the patients are difficult to adapt to in operation by adjusting the height of the fusion cage body, and the treatment effect is easy to influence.
The patent of CN107174383A specifically discloses a spreading type interbody fusion cage, which consists of a fusion contact mechanism and a driving spreading mechanism, wherein the fusion contact mechanism consists of an upper cage seat and a lower cage seat, the driving placement mechanism consists of an adjusting screw, a left adjusting block and a right adjusting block, the left adjusting block and the right adjusting block are driven to move inwards simultaneously through the rotation of the adjusting screw, and the distance between the upper cage seat and the lower cage seat is pulled to spread the cage. However, the structure of the fusion device is not stable enough, the bone implant amount is not large, and the bone fusion effect of the intervertebral fusion device is not ideal.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art, and provides the distractable fusion cage which is convenient to process and assemble, has better part interchangeability, increases the bone grafting space and enhances the bone fusion effect of the intervertebral fusion cage.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides a can strut fusion ware, includes upper cover plate, lower apron, drive and strut the mechanism, and drive struts the mechanism and includes adjusting screw, left regulating block, right regulating block, left regulating block and right regulating block pass through threaded connection respectively in adjusting screw's left and right sides, and upper cover plate and lower apron's left side passes through the connecting rod with left regulating block respectively and cooperatees, and upper cover plate and lower apron's right side passes through the connecting rod with right regulating block respectively and cooperatees, and left regulating block and right regulating block follow axial reverse motion, drives upper cover plate and lower apron and draw close or keep away from each other.
Preferably, the left and right ends of the front and back both sides of the below of upper cover plate are equipped with upper cover plate connecting rod pinhole respectively, the left and right both ends of the front and back both sides of the top of lower cover plate are equipped with respectively with the crisscross lower cover plate connecting rod pinhole that sets up of upper cover plate connecting rod pinhole, the front and back both sides of left regulating block and right regulating block are equipped with the round pin post respectively, one end of connecting rod is equipped with upper and lower cover plate connecting rod hole, the other end sets up left and right regulating block connecting rod hole, the round pin post inserts and establishes in controlling the regulating block connecting rod downthehole, upper cover plate connecting rod pinhole is connected through the pin with lower cover plate connecting rod pinhole respectively, the middle part of left regulating block and right regulating block is equipped with the screw hole, the left part of regulating screw is equipped with the external screw of reverse rotation, the left end of regulating screw is connected with left regulating block, the right end is connected with right regulating block, drive left regulating block and right regulating block simultaneously along axial reverse motion, drive upper cover plate and lower cover plate draw close each other or keep away from. The reverse motion of this place includes opposite direction motion and back motion, drives left regulating block and right regulating block through adjusting screw's rotation and simultaneously along axial opposite direction motion, drives upper cover plate and lower apron and draws close each other, drives left regulating block and right regulating block through adjusting screw's rotation and simultaneously along axial back motion, drives upper cover plate and lower apron and keep away from each other.
Further preferably, a first avoiding groove is formed between two upper cover plate connecting rod pin holes on the front side and the rear side of each end of the upper cover plate, and a second avoiding groove is formed between two lower cover plate connecting rod pin holes on the front side and the rear side of each end of the lower cover plate, so that more bone implants can be implanted at the same height.
Still preferably, a hexagonal driving groove is formed in an end face of the adjusting screw, a limiting portion is arranged between the external thread rotating in the reverse direction and the external thread rotating in the forward direction, the moving position of the connecting rod is limited, and the limiting portion can be an annular protruding block or other structures capable of achieving the function.
Preferably, for better insertion of the fusion cage into the vertebral plates, one end of the upper cover plate is provided with a first arc-shaped structure which is bent downwards and inwards, and the lower cover plate is provided with a second arc-shaped structure which is in mirror symmetry with the first arc-shaped structure.
Preferably, anti-skid grooves are respectively arranged on the upper surface of the upper cover plate and the lower surface of the lower cover plate.
Preferably, the middle part of the upper cover plate and the middle part of the lower cover plate are respectively provided with a bone grafting window, and are preferably waist-shaped.
Further preferably, limit stops matched with the shapes of the end parts of the bone grafting window are respectively arranged on the upper end part and the lower end part of the left adjusting block and the right adjusting block, and are used for limiting the left-right moving positions of the left adjusting block and the right adjusting block.
Preferably, the connecting rod is provided with a first reinforcing part at the connecting rod holes of the upper cover plate and the lower cover plate, and a second reinforcing part at the connecting rod holes of the left adjusting block and the right adjusting block, so that the strength of the connecting rod is improved.
Preferably, the second reinforcement portion is provided with a third avoiding groove.
The invention also provides a use method of the fusion device, which comprises the following steps:
1. placing the fusion device in a closed state;
2. Implanting a prepared bone implant from a bone implantation window;
3. Sleeving the instrument on the hexagonal driving groove, and fixing the fusion device;
4. Inserting the fusion cage between the vertebral plates;
5. rotating the instrument clockwise, and stopping rotating after the instrument is propped up to a required height;
6. The instrument is removed and the remaining bone implant is implanted.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the invention uses the connecting rod to replace the traditional sliding block, so that the processing and the assembly are more convenient, the interchangeability of parts is better, the bone grafting space is larger, and the bone fusion effect of the interbody fusion cage is enhanced;
2. The invention arranges the arc structure which is downwards and inwards bent at the same end part of the upper cover plate and the lower cover plate, so that the fusion cage is easier and smoother to be inserted between vertebral plates;
3. The invention sets limit stop on the left and right adjusting blocks, and cooperates with the bone grafting window to limit the left and right moving position of the left and right adjusting blocks.
Drawings
FIG. 1 is a schematic diagram of an explosion structure of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the upper cover plate of FIG. 1, wherein 2-1 is a top perspective view and 2-2 is a bottom perspective view;
FIG. 3 is a schematic view of the lower cover plate of FIG. 1, wherein 3-1 is a bottom perspective view; 3-2 is a top perspective view;
FIG. 4 is a schematic view of the adjusting screw of FIG. 1, wherein 4-1 is a perspective view; 4-2 is a side view;
FIG. 5 is a schematic diagram of the left adjustment block of FIG. 1;
FIG. 6 is a schematic diagram of the right adjustment block of FIG. 1;
FIG. 7 is a schematic view of the connecting rod of FIG. 1;
FIG. 8 is a schematic diagram of the folding state of embodiment 1;
Fig. 9 is a schematic view of the distracted state of example 1;
Wherein: 1. an upper cover plate; 11. a lower connecting block; 12. an upper cover plate connecting rod pin hole; 13. a first avoidance groove; 14. a first arcuate structure; 2. a lower cover plate; 21. an upper connecting block; 22. a lower cover plate connecting rod pin hole; 23. a second avoidance groove; 24. a second arc structure; 3. adjusting a screw; 31. reversely rotating the external thread; 32. forward rotating the external thread; 33. a hexagonal driving groove; 34. a limit part; 4. a left regulating block; 5. a right adjusting block; 6. a connecting rod; 61. connecting rod holes of the upper cover plate and the lower cover plate; 62. left and right adjusting block connecting rod holes; 63. a first reinforcing part; 64. a second reinforcing part; 65. a third avoidance groove; 7. a pin; 8. a bone grafting window; 9. an anti-skid groove; 10. a pin; 45. and a limit stop.
Detailed Description
The invention is further described below with reference to the drawings and examples. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the structures to be referred to must have a specific direction, and thus should not be construed as limiting the present invention.
Example 1
As shown in fig. 1-9, the expandable fusion device of the embodiment comprises an upper cover plate 1, a lower cover plate 2 and a driving expansion mechanism, wherein the driving expansion mechanism comprises an adjusting screw 3, a left adjusting block 4, a right adjusting block 5 and 8 connecting rods 6.
In this embodiment, two protruding lower connection blocks 11 are respectively disposed at the left and right ends of the front and rear sides below the upper cover plate 1, 4 total connection blocks are disposed on the left and right sides below the upper cover plate 1, each lower connection block 11 is provided with an upper cover plate connecting rod pin hole 12, and the central connection lines of the 4 upper cover plate connecting rod pin holes 12 form a rectangle. The left and right ends of the front and rear sides above the lower cover plate 2 are respectively provided with a convex upper connecting block 21, 4 upper connecting blocks are totally provided, each upper connecting block 21 is provided with a lower cover plate connecting rod pin hole 22, and the central connecting line of the 4 lower cover plate connecting rod pin holes 22 forms a rectangle. The upper cover link pin holes 12 are staggered with the lower cover link pin holes 22. In the present embodiment, the upper cover link pin holes 12 are correspondingly provided in parallel inside the lower cover link pin holes 22.
The front and rear sides of the left adjusting block 4 and the right adjusting block 5 are respectively provided with a pin column 10, one end part of each connecting rod 6 is provided with an upper cover plate connecting rod hole 61 and a lower cover plate connecting rod hole 61, the other end part is provided with a left adjusting block connecting rod hole 62 and a right adjusting block connecting rod hole 62, the pin column 10 is inserted in the left adjusting block connecting rod hole 62 and can rotate in the left adjusting block connecting rod hole 62, and the upper cover plate connecting rod pin hole 12 and the lower cover plate connecting rod pin hole 22 are respectively connected with the upper cover plate connecting rod hole 61 and the lower cover plate connecting rod hole 61 in a rotating way through pins 7.
The middle part of left regulating block 4 and right regulating block 5 is equipped with the screw hole, and the left side portion of adjusting screw 3 is equipped with counter-rotating external screw thread 31, and the right side portion is equipped with forward rotation's external screw thread 32, and adjusting screw 3's left end is connected with left regulating block 4, and the right-hand member is connected with right regulating block 5, drives left regulating block 4 and right regulating block 5 simultaneously along axial reverse motion through adjusting screw 3's rotation, drives upper cover plate 1 and lower cover plate 2 and draws close or keep away from each other. The reverse motion here includes opposite movement and back movement, namely drives left adjusting block 4 and right adjusting block 5 through adjusting screw 3's rotation and moves along axial opposite direction simultaneously, drives upper cover plate 1 and lower apron 2 and draws close each other, drives left adjusting block 4 and right adjusting block 5 through adjusting screw 3's rotation and moves along axial back simultaneously, drives upper cover plate 1 and lower apron 2 and keeps away from each other.
The distractable fusion device of the embodiment has two states of folding and distracting. When the fusion device is in a closed state, one end parts of all connecting rods 6 with the left and right adjusting block connecting rod holes 62 are mutually closed, and the connecting rods 6 approach to the upper cover plate 1 and the lower cover plate 2; when the cage is in the open state, one end portions of all the links 6 having the left and right regulating block link holes 62 are away from each other, and the links 6 are away from the upper cover plate 1 and the lower cover plate 2 in directions.
In this embodiment, a first avoidance groove 13 is formed between two upper cover plate connecting rod pin holes 12 on the front and rear sides of each end of the upper cover plate 1, and a second avoidance groove 23 is formed between two lower cover plate connecting rod pin holes 22 on the front and rear sides of each end of the lower cover plate 2, and the avoidance grooves are in a circular arc shape or other shapes, so that more bone implants can be implanted at the same height.
In this embodiment, a hexagonal driving groove 33 is provided on one end surface of the adjusting screw 3, a limiting portion 34 is provided between the external screw 31 rotating in the reverse direction and the external screw 32 rotating in the forward direction to limit the moving position of the connecting rod 6, and the limiting portion 34 is provided as an annular bump, or may be another structure capable of achieving this effect.
In this embodiment, for better insertion of the fusion cage into the vertebral plates, one end of the upper cover plate 1 is provided with a first arc-shaped structure 14 bent downwards and inwards, and the lower cover plate 2 is provided with a second arc-shaped structure 24 which is in mirror symmetry with the first arc-shaped structure 14.
In the present embodiment, the upper surface of the upper cover plate 1 and the lower surface of the lower cover plate 2 are provided with zigzag-shaped anti-slip grooves 9, respectively.
In this embodiment, the middle part of the upper cover plate 1 and the middle part of the lower cover plate 2 are respectively provided with a bone grafting window 8, which is waist-shaped.
In this embodiment, limit stoppers 45 matching with the end shapes of the bone grafting windows 8 are respectively provided on the upper and lower ends of the left and right adjusting blocks 4,5 for restricting the left and right moving positions of the left and right adjusting blocks 4, 5.
In the present embodiment, the first reinforcement 63 is provided on the link 6 at the upper and lower cover link holes 61, and the second reinforcement 64 is provided at the left and right adjustment block link holes 62, increasing the strength of the link 6. The first reinforcing portion 63 is located on a side of the connecting rod 6 away from the lower connecting block 11 and the upper connecting block 21, and the second reinforcing portion 64 and the first reinforcing portion 63 are located on both sides of the connecting rod 6.
In this embodiment, the second reinforcement portion 64 is further provided with a third avoidance groove 65 for avoiding the lower connection block 11 and the upper connection block 21.
The application method of the fusion device comprises the following steps:
1. placing the fusion device in a closed state;
2. Implanting a prepared bone implant from a bone implantation window;
3. Sleeving the instrument on the hexagonal driving groove, and fixing the fusion device;
4. Inserting the fusion cage between the vertebral plates;
5. rotating the instrument clockwise, and stopping rotating after the instrument is propped up to a required height;
6. The instrument is removed and the remaining bone implant is implanted.
The instruments herein are conventional bone grafting instruments in the art and are not described herein as an inventive point of the present invention.
The above detailed description of the present invention is provided to facilitate understanding of the method and its core concept, and is intended to enable those skilled in the art to understand the present invention and to implement it accordingly, and is not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.