CN114767348A - BI-AAD atlantoaxial joint fusion cage - Google Patents
BI-AAD atlantoaxial joint fusion cage Download PDFInfo
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- CN114767348A CN114767348A CN202210385357.0A CN202210385357A CN114767348A CN 114767348 A CN114767348 A CN 114767348A CN 202210385357 A CN202210385357 A CN 202210385357A CN 114767348 A CN114767348 A CN 114767348A
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- 230000004927 fusion Effects 0.000 title claims abstract description 86
- 210000002632 atlanto-axial joint Anatomy 0.000 title claims abstract description 29
- 239000011159 matrix material Substances 0.000 claims abstract description 28
- 230000007480 spreading Effects 0.000 claims description 12
- 208000002998 atlanto-axial fusion Diseases 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000013011 mating Effects 0.000 claims 1
- 239000011295 pitch Substances 0.000 abstract description 16
- 230000008859 change Effects 0.000 abstract description 7
- 210000003128 head Anatomy 0.000 description 17
- 230000033001 locomotion Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 210000002385 vertebral artery Anatomy 0.000 description 2
- 206010010356 Congenital anomaly Diseases 0.000 description 1
- 208000000059 Dyspnea Diseases 0.000 description 1
- 206010013975 Dyspnoeas Diseases 0.000 description 1
- 208000007623 Lordosis Diseases 0.000 description 1
- 206010028836 Neck pain Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 208000037873 arthrodesis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 231100000861 limb weakness Toxicity 0.000 description 1
- 208000027905 limb weakness Diseases 0.000 description 1
- 230000001045 lordotic effect Effects 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 210000001767 medulla oblongata Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009251 neurologic dysfunction Effects 0.000 description 1
- 208000015015 neurological dysfunction Diseases 0.000 description 1
- 231100000862 numbness Toxicity 0.000 description 1
- 210000001154 skull base Anatomy 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Transplantation (AREA)
- Neurology (AREA)
- Heart & Thoracic Surgery (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Cardiology (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
- Prostheses (AREA)
Abstract
The invention relates to the technical field of medical instruments, in particular to a BI-AAD atlantoaxial joint fusion cage which comprises a shell (an upper distraction shell and a lower distraction shell are embedded), a fusion cage matrix support ring, a first conical bolt, a second conical bolt and an intermediate connecting piece, wherein the shell is provided with a first opening hole and a second opening hole; the fusion device matrix support ring is arranged in the shell, and the first conical bolt and the second conical bolt are connected through an intermediate connecting piece positioned in the fusion device matrix support ring, so that the first conical bolt and the second conical bolt are matched with the fusion device matrix support ring through threads. When the fusion device is in work, the BI-AAD atlantoaxial joint fusion device is implanted into a corresponding part of a human body through the clamping device, the first taper bolt and the second taper bolt enter the fusion device matrix support ring through the regulation and control of the external torsion piece, and the height adjustment and the change of the front convex angle of the BI-AAD atlantoaxial joint fusion device are realized due to the difference of the diameters and the screw pitches of the end parts of the first taper bolt and the second taper bolt.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a BI-AAD atlantoaxial joint fusion cage.
Background
Depressed cranial-fundus atlantoaxial dislocation (BI-AAD) is a common congenital malformation of craniocervical junction area, in which the dentate projection of a patient upwards and backwards dislocates to press medulla oblongata and high-position cervical medulla, often combining serious neurological dysfunction, such as limb weakness, neck pain, unstable walking, limb numbness, dyspnea, etc. The disease is mainly treated by operation, but the operation scheme for treating the disease is numerous, and in recent years, neurosurgeons propose a new reduction technology: the posterior lateral joint release and cantilever resetting internal fixation technology, the support of the fusion device between joints can effectively increase the height resetting skull base depression of the atlantoaxial lateral joint gap, and the cantilever resetting technology can realize the posterior pressurization resetting of the atlantoaxial dislocation. However, at present, the operation treatment is carried out, a special atlantoaxial intersomatic fusion device is lacked, only a fusion device of cervical intervertebral discs or lumbar intervertebral discs can be adopted for replacement, and the reduction effect is not ideal due to the fixed height, the adjustable angle and the uncomfortable size and shape of the traditional intersomatic fusion device. Generally, a fusion cage with a height adjusting function is provided, in which a screw is usually adopted to drive two sliding blocks to move closer or away from each other, so that the height between an upper plate and a lower plate connected with the sliding blocks is increased or decreased, and the height of the fusion cage is changed. How to adjust the height of the atlantoaxial joint fusion cage implanted into the BI-AAD patient is a difficult problem to be solved.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a BI-AAD atlantoaxial intersomatic cage for recovering the lost height of the atlantoaxial joint space of a BI-AAD patient and correcting the posterior convex deformity of the atlantoaxial joint of the patient and recovering the physiological lordosis, the BI-AAD atlantoaxial intersomatic cage of the present invention includes a cage (an upper support cage and a lower support cage are engaged), a cage base support ring, a first taper bolt, a second taper bolt, and an intermediate connection member. The fusion cage base supporting ring is arranged in the shell, and the first taper bolt and the second taper bolt are connected through an intermediate connecting piece positioned in the fusion cage base supporting ring, so that the first taper bolt and the second taper bolt are matched with the fusion cage base supporting ring through threads. During operation, the BI-AAD atlantoaxial joint fusion cage is implanted into a corresponding part of a human body through a clamping device, the first taper bolt and the second taper bolt are regulated and controlled by the external torsion piece to enter the interior of the fusion cage matrix support ring, and the height adjustment and the change of the front convex angle of the BI-AAD atlantoaxial joint fusion cage are realized by designing the difference of the diameters and the screw pitches of the end parts of the first taper bolt and the second taper bolt.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a BI-AAD atlantoaxial joint fusion cage which comprises a shell, a fusion cage matrix support ring, a first taper bolt, a second taper bolt and a middle connecting part, wherein the shell is provided with a first conical bolt hole and a second conical bolt hole;
the shell comprises an upper distraction shell and a lower distraction shell;
the first conical bolt comprises a first conical bolt head part in an inverted cone shape and a first conical bolt working part;
the second conical bolt comprises a second conical bolt head part in an inverted cone shape and a second conical bolt working part;
the upper spreading shell is embedded with the lower spreading shell through an inwards concave clamping strip sliding structure; the fusion cage base body support ring is arranged inside the upper distraction shell and the lower distraction shell; the middle connecting piece penetrates through the fusion device matrix support ring, and two ends of the middle connecting piece are respectively connected with the first conical bolt and the second conical bolt; the screw pitch of the working part of the first conical bolt is larger than that of the working part of the second conical bolt, and the diameter of the head part of the first conical bolt is smaller than that of the head part of the second conical bolt.
In one embodiment of the invention, the front end of the shell is in a bullet head structure, and the tail end of the shell is provided with a circular through hole; the circular through hole is embedded with the head of the first conical bolt.
In one embodiment of the present invention, the upper spreading housing and the lower spreading housing are provided with a square through hole structure on the surface;
two ends of the upper surface and the lower surface of the fusion device matrix support ring are provided with symmetrical convex block structures; the convex square block structure is embedded with the square through hole structure.
In one embodiment of the invention, the two sides inside the fusion device base supporting ring are provided with thread structures; the thread structure includes left and right helical internal threads.
In one embodiment of the present invention, the pitch of the left-hand internal thread is greater than the pitch of the right-hand internal thread, and the length of the left-hand internal thread is greater than the length of the right-hand internal thread.
In one embodiment of the invention, the working part of the first taper bolt is provided with a right-hand external thread matched with the left-hand internal thread;
and a left-spiral external thread matched with the right-spiral internal thread is arranged at the working part of the second conical bolt.
In one embodiment of the present invention, one end of the middle connecting member is a cross structure; the other end is a straight line structure.
In one embodiment of the invention, the head of the first conical bolt is provided with a hexagonal counter bore structure; the tail end of the working part of the first conical bolt is provided with a cross counter bore structure which is embedded with the cross structure.
In an embodiment of the invention, the end of the working part of the second taper bolt is provided with a straight counter bore structure which is embedded with the straight structure.
In one embodiment of the present invention, the upper and lower distracting shells are provided with teeth-like structures on the surface;
the side edge of the tail of the lower distraction shell along the height direction is provided with a stepped groove structure matched with the clamping device.
In one embodiment of the present invention, the "height direction" of the "lower distracting housing tail in the height direction" refers to a direction in which the upper surface of the upper distracting housing is vertically connected to the lower surface of the lower distracting housing.
In one embodiment of the invention, the external torsion piece is matched with the hexagonal counter bore structure of the first conical bolt, and the distance of the first conical bolt entering the fusion device base body supporting ring is regulated and controlled through torsion; under the drive of the middle connecting piece, the second conical bolt enters the base body supporting ring of the fusion cage to cause the separation motion of the upper distraction shell and the lower distraction shell along the height direction, so that the height adjustment is realized; because the head size of the first taper bolt is smaller than that of the second taper bolt, the screw pitches of the working part of the first taper bolt and the working part of the second taper bolt are different, and the advancing speed of the first taper bolt is smaller than that of the second taper bolt, the expanding height of the front end of the fusion cage is larger than that of the tail end of the fusion cage, and the change of the front convex angle is realized.
Compared with the prior art, the invention has the following beneficial effects:
(1) the atlantoaxial joint fusion cage which is suitable for the atlantoaxial side block of a BI-AAD patient and can adjust the height and the anterior convex angle is clamped by a clamping device, after the fusion cage is sent to a corresponding part of a human body, a corresponding external torsion piece is inserted to be matched with a first taper bolt for torsion rotation, the first taper bolt advances into a fusion cage matrix support ring, a second taper bolt is driven by an intermediate connecting piece to rotate into the fusion cage matrix support ring, the first taper bolt and the second taper bolt are simultaneously drawn together towards the middle, the separation movement of an upper distraction shell and a lower distraction shell along the height direction is caused, and the height adjustment is realized; and because the head size of the first taper bolt is smaller than that of the second taper bolt and the screw pitches of the first taper bolt and the second taper bolt are different, the advancing speed of the first taper bolt is smaller than that of the second taper bolt, so that the expanding height of the front end of the fusion cage is larger than that of the rear end of the fusion cage, and the change of the front convex angle is realized. Because the atlantoaxial side joint space is small, the push rod is gradually rotated and pushed forwards, so that the change of the height and the forward convex angle is realized, and the traction and stimulation to the vertebral artery can be avoided.
(2) The head of the BI-AAD atlantoaxial joint fusion device is of a bullet structure, so that the implantation of the BI-AAD atlantoaxial joint fusion device can be facilitated.
(3) The upper and lower expanding shells of the invention are both provided with tooth-shaped structures, which can increase friction force and prevent slipping.
(4) The fusion device between the BI-AAD atlantoaxial joints has a self-locking distraction mechanism, enhances the instant stability, can be controllably placed and distracted to adapt to the anatomical morphology of a patient, and meets the treatment and installation requirements of the BI-AAD patient.
Drawings
FIG. 1 is a schematic structural view of the fusion cage between the extensive region axis joints of BI-AAD of the invention in an expanded state;
FIG. 2 is a schematic structural view of a BI-AAD atlantoaxial interarthrodesis cage of the present invention in a fully chimeric state;
FIG. 3 is a schematic structural view of a fusion cage matrix support ring in the BI-AAD atlantoaxial fusion cage of the present invention;
FIG. 4 is a schematic view of the structure of the superior-distraction shell in the BI-AAD atlantoaxial fusion cage of the present invention;
FIG. 5 is a schematic structural view of the lower strut shell in the BI-AAD atlantoaxial joint fusion cage of the present invention;
FIG. 6 is a schematic structural view of a first taper bolt in a BI-AAD atlantoaxial joint fusion cage of the present invention;
FIG. 7 is a schematic structural view of a second taper bolt in a BI-AAD atlantoaxial joint fusion cage of the present invention;
FIG. 8 is a schematic structural view of an intermediate connecting member in a BI-AAD atlantoaxial joint fusion cage of the present invention;
the reference numbers in the figures: 1. a housing; 2. an upper spreader housing; 3. a lower distracting housing; 4. a fusion cage base support ring; 5. a first taper bolt; 6. a second taper bolt; 7. an intermediate connecting member; 8. a concave clamping strip sliding structure; 9. a square via structure; 10. a circular through hole; 11. a tooth-shaped structure; 12. a step groove structure; 13. a convex cube structure; 14. a thread structure; 15. a left-hand helical internal thread; 16. right-hand internal screw threads; 17. a first conical bolt head; 18. a first taper bolt working position; 19. a right helical external thread; 20. a hexagonal counter bore structure; 21. a cross-shaped counter bore structure; 22. a second conical bolt head; 23. a second conical bolt working part; 24. a left-handed helical external thread; 25. a straight counter bore structure; 26. a cross structure; 27. a straight line structure.
Detailed Description
The invention provides a BI-AAD atlantoaxial joint fusion cage which comprises a shell, a fusion cage matrix support ring, a first taper bolt, a second taper bolt and a middle connecting part, wherein the shell is provided with a first conical bolt hole and a second conical bolt hole;
the shell comprises an upper distraction shell and a lower distraction shell;
the first conical bolt comprises a first conical bolt head part in an inverted cone shape and a first conical bolt working part;
the second conical bolt comprises a second conical bolt head part in an inverted cone shape and a second conical bolt working part;
the upper spreading shell is embedded with the lower spreading shell through an inwards concave clamping strip sliding structure; the fusion cage base body support ring is arranged inside the upper distraction shell and the lower distraction shell; the middle connecting piece penetrates through the fusion device matrix support ring, and two ends of the middle connecting piece are respectively connected with the first conical bolt and the second conical bolt; the screw pitch of the working part of the first conical bolt is larger than that of the working part of the second conical bolt, and the diameter of the head part of the first conical bolt is smaller than that of the head part of the second conical bolt.
In one embodiment of the invention, the front end of the shell is in a bullet head structure, and the tail end of the shell is provided with a circular through hole; the circular through hole is embedded with the head of the first conical bolt.
In one embodiment of the present invention, the upper spreading housing and the lower spreading housing are provided with a square through hole structure on the surface;
the upper surface and the lower surface of the fusion device matrix support ring are provided with symmetrical convex block structures at two ends; the convex square block structure is embedded with the square through hole structure.
In one embodiment of the invention, the two sides inside the fusion device base supporting ring are provided with thread structures; the thread structure includes left and right helical internal threads.
In one embodiment of the present invention, the pitch of the left-hand internal thread is greater than the pitch of the right-hand internal thread, and the length of the left-hand internal thread is greater than the length of the right-hand internal thread.
In one embodiment of the invention, the working part of the first taper bolt is provided with a right-handed external thread matched with the left-handed internal thread;
and the working part of the second conical bolt is provided with a left spiral external thread matched with the right spiral internal thread.
In one embodiment of the invention, one end of the middle connecting piece is in a cross structure; the other end is a straight line structure.
In one embodiment of the invention, the head of the first conical bolt is provided with a hexagonal counter bore structure; the tail end of the working part of the first conical bolt is provided with a cross counter bore structure which is embedded with the cross structure.
In an embodiment of the invention, the tail end of the working part of the second taper bolt is provided with a straight counter bore structure which is embedded with the straight structure.
In one embodiment of the present invention, the upper and lower distracting shells are provided with teeth-like structures on the surface;
the side edge of the tail of the lower distraction shell along the height direction is provided with a stepped groove structure matched with the clamping device.
In one embodiment of the present invention, the "height direction" of the "lower distracting housing tail in the height direction" refers to a direction in which the upper surface of the upper distracting housing is vertically connected to the lower surface of the lower distracting housing.
In one embodiment of the invention, the external torsion piece is matched with the hexagonal counter bore structure of the first conical bolt, and the distance of the first conical bolt entering the fusion device base body supporting ring is regulated and controlled through torsion; under the drive of the middle connecting piece, the second conical bolt enters the base body supporting ring of the fusion cage to cause the separation movement of the upper distraction shell and the lower distraction shell along the height direction, so that the height adjustment is realized; because the head size of the first taper bolt is smaller than that of the second taper bolt, the screw pitches of the working part of the first taper bolt and the working part of the second taper bolt are different, and the advancing speed of the first taper bolt is smaller than that of the second taper bolt, the expanding height of the front end of the fusion cage is larger than that of the tail end of the fusion cage, and the change of the front convex angle is realized.
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
The present embodiment provides an atlantoaxial arthrodesis cage that allows the height and lordotic angle of the atlantoaxial lateral mass of a BI-AAD patient to be adjusted.
As shown in fig. 1-8, an atlantoaxial interarticular cage with adjustable height and anterior convex angle to accommodate the atlantoaxial lateral mass of a BI-AAD patient comprises a housing 1, a cage base support ring 4, a first taper bolt 5, a second taper bolt 6, an intermediate connecting piece 7;
the shell 1 comprises an upper distraction shell 2 and a lower distraction shell 3; the upper distraction shell 2 is embedded with the lower distraction shell 3 through an inwards concave clamping strip sliding structure 8; the front end of the shell 1 is of a bullet head structure, the tail end of the shell is of a plane structure with two sides connected with the side edges through smooth radians, and a circular through hole 10 is formed in the tail end of the shell; the surfaces of the upper distraction shell 2 and the lower distraction shell 3 are provided with a square through hole structure 9 and a dentate structure 11, and the dentate structures 11 are arranged at two sides of the square through hole along the width direction of the fusion device matrix support ring 4; the side edge of the tail part of the lower distraction shell 3 along the height direction is also provided with a step groove structure 12 matched with the clamping device.
The fusion cage matrix support ring 4 is arranged inside the upper distraction shell 2 and the lower distraction shell 3; two ends of the upper surface and the lower surface of the fusion device matrix support ring 4 are provided with symmetrical convex block structures 13; the convex square structure 13 is embedded with the square through hole structure 9; the two sides inside the fusion device matrix support ring 4 are provided with thread structures 14 which comprise left-handed screw threads 15 and right-handed screw threads 16; wherein, the pitch of the left screw internal thread 15 is larger than the pitch of the right screw internal thread 16, and the length of the left screw internal thread 15 is longer than the length of the right screw internal thread 16;
the middle connecting piece 7 passes through the fusion device matrix support ring 4, one end of the middle connecting piece 7 is of a cross structure 26, and the other end of the middle connecting piece is of a straight structure 27; the intermediate connecting piece 7 is connected with the first taper bolt 5 and the second taper bolt 6;
the first conical bolt 5 comprises a first conical bolt head 17 in an inverted cone shape and a first conical bolt working part 18, wherein the first conical bolt head 17 is embedded with the circular through hole 10, and the first conical bolt head 17 is further provided with a hexagonal counter bore structure 20; a right-handed external thread 19 matched with the left-handed internal thread 15 is arranged at the first conical bolt working position 18, and a cross counter bore structure 21 embedded with a cross structure 26 is arranged at the tail end of the first conical bolt working position 18;
the second taper bolt 6 comprises a second taper bolt head part 22 in an inverted taper shape and a second taper bolt working part 23; the working part 23 of the second conical bolt is provided with a left spiral external thread 24 matched with the right spiral internal thread 16, and the tail end of the working part 23 of the second conical bolt is provided with a straight counter bore structure 25 embedded with a straight structure 27;
the first tapered bolt working portion 18 has a pitch greater than the pitch of the second tapered bolt working portion 23 and the diameter of the first tapered bolt head 17 is less than the diameter of the second tapered bolt head 22.
When the fusion cage works, the clamping device is matched with the stepped groove structure 12 on the BI-AAD atlantoaxial joint fusion cage, the BI-AAD atlantoaxial joint fusion cage is sent to a corresponding part of a human body, then the torsion transmission device which is embedded with the hexagonal counter bore structure 20 of the head part 17 of the first conical bolt is used for torsionally rotating the first conical bolt 5, the right spiral external thread 19 of the working part 18 of the first conical bolt is matched with the left spiral internal thread 15 of the fusion cage matrix support ring 4, and the first conical bolt 5 enters the fusion cage matrix support ring 4; meanwhile, the middle connecting piece 7 drives the second taper bolt 6 to rotate towards the fusion device base supporting ring 4 (the left-hand external thread 24 of the second taper bolt working part 23 is matched with the right-hand internal thread 16 of the fusion device base supporting ring 4); the first conical bolt 5 and the second conical bolt 6 are drawn towards the middle, so that the upper distraction shell 2 and the lower distraction shell 3 are separated from each other along the height direction through the concave clamping strip sliding structure 8, and the height adjustment is realized;
because the head size of the first taper bolt 5 is smaller than that of the second taper bolt 6, and the thread pitch of the working part of the first taper bolt is larger than that of the thread working part of the second taper bolt 6, the speed of the first taper bolt 5 entering the fusion device matrix support ring 4 is smaller than that of the second taper bolt 6 entering the fusion device matrix support ring 4, so that the distraction height of the front end of the fusion device between the BI-AAD atlantoaxial joints is larger than that of the rear end, and the change of the front convex angle is realized. The method can avoid traction and stimulation to vertebral artery;
the integral structure of the BI-AAD atlantoaxial joint fusion device is a square structure, and the front end of the BI-AAD atlantoaxial joint fusion device is of a bullet structure, so that the implantation of the BI-AAD atlantoaxial joint fusion device is facilitated; the upper distraction shell 2 and the lower distraction shell 3 are both provided with tooth-shaped structures 11, so that the friction force can be increased, and the slippage can be prevented;
in summary, the fusion device between the BI-AAD atlantoaxial joints has a self-locking distraction mechanism, enhances the instant stability, can be controllably placed and distracted to adapt to the anatomical morphology of a patient, and meets the treatment and installation requirements of the BI-AAD patient.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make modifications and alterations without departing from the scope of the present invention.
Claims (10)
1. A BI-AAD atlantoaxial joint fusion cage is characterized by comprising a shell (1), a fusion cage matrix support ring (4), a first taper bolt (5), a second taper bolt (6) and an intermediate connecting part (7);
the shell (1) comprises an upper spreading shell (2) and a lower spreading shell (3);
the first conical bolt (5) comprises a first conical bolt head (17) in an inverted cone shape and a first conical bolt working part (18);
the second conical bolt (6) comprises a second conical bolt head part (22) in an inverted cone shape and a second conical bolt working part (23);
the upper distraction shell (2) is embedded with the lower distraction shell (3) through an inwards concave clamping strip sliding structure (8); the fusion cage base body support ring (4) is arranged inside the upper spreading shell (2) and the lower spreading shell (3); the middle connecting piece (7) penetrates through the fusion device matrix support ring (4), and two ends of the middle connecting piece are respectively connected with the first conical bolt (5) and the second conical bolt (6); the thread pitch of the first conical bolt working part (18) is larger than that of the second conical bolt working part (23), and the diameter of the head part (17) of the first conical bolt is smaller than that of the head part (22) of the second conical bolt.
2. The BI-AAD atlantoaxial fusion cage as claimed in claim 1, wherein the front end of the shell (1) is of a bullet head structure, and the tail end is provided with a circular through hole (10); the circular through hole (10) is embedded with the head part (17) of the first conical bolt.
3. The BI-AAD atlantoaxial fusion cage according to claim 1, characterized in that the upper and lower distraction shells (2, 3) are each provided with a square through hole structure (9) on their surface;
two ends of the upper surface and the lower surface of the fusion device matrix support ring (4) are provided with symmetrical convex block structures (13); the convex square structure (13) is embedded with the square through hole structure (9).
4. The BI-AAD atlantoaxial fusion cage according to claim 3, wherein the cage matrix support ring (4) is internally provided with a threaded structure (14) on both sides; the thread formation (14) comprises a left-hand internal thread (15) and a right-hand internal thread (16).
5. The BI-AAD atlantoaxial fusion cage of claim 4, wherein the pitch of the left-handed internal thread (15) is greater than the pitch of the right-handed internal thread (16), and the length of the left-handed internal thread (15) is greater than the length of the right-handed internal thread (16).
6. The BI-AAD atlantoaxial fusion cage of claim 5, wherein the first taper bolt working site (18) is provided with a right-handed external thread (19) mating with the left-handed internal thread (15);
the second conical bolt working part (23) is provided with a left spiral external thread (24) matched with the right spiral internal thread (16).
7. The BI-AAD atlantoaxial fusion cage of claim 1, wherein the intermediate connector (7) has a cross structure (26) at one end; the other end is a straight line structure (27).
8. The BI-AAD atlantoaxial fusion cage of claim 7 wherein the first conical bolt head (17) is provided with a hexagonal counter bore structure (20); the tail end of the working part (18) of the first conical bolt is provided with a cross counter bore structure (21) which is embedded with a cross structure (26).
9. The BI-AAD atlantoaxial intersomatic fusion cage of claim 7, wherein the second conical bolt working portion (23) is provided at its distal end with a straight counter bore structure (25) engaging with a straight structure (27).
10. The BI-AAD atlantoaxial fusion cage of claim 1 wherein the upper and lower distraction shells (2, 3) are surface provided with dentations (11);
the side edge of the tail part of the lower distraction shell (3) along the height direction is provided with a stepped groove structure (12) matched with the clamping device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210385357.0A CN114767348A (en) | 2022-04-13 | 2022-04-13 | BI-AAD atlantoaxial joint fusion cage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210385357.0A CN114767348A (en) | 2022-04-13 | 2022-04-13 | BI-AAD atlantoaxial joint fusion cage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114767348A true CN114767348A (en) | 2022-07-22 |
Family
ID=82429045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210385357.0A Pending CN114767348A (en) | 2022-04-13 | 2022-04-13 | BI-AAD atlantoaxial joint fusion cage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114767348A (en) |
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2022
- 2022-04-13 CN CN202210385357.0A patent/CN114767348A/en active Pending
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