CN201108492Y

CN201108492Y - Synarthrosis machine within atlantoaxial

Info

Publication number: CN201108492Y
Application number: CNU2007200757888U
Authority: CN
Inventors: 倪斌; 李松凯
Original assignee: Second Military Medical University SMMU
Current assignee: Second Military Medical University SMMU
Priority date: 2007-11-20
Filing date: 2007-11-20
Publication date: 2008-09-03
Anticipated expiration: 2017-11-20

Abstract

The utility model relates to the technical field of medical devices and discloses an atlantoaxial intervertebral joint fusing device. The fusing device is a flat hollow polyhedron which consists of two parts, namely a front support segment (1) and a rear support segment (2); the front support segment is similar to a cone consisting of four surfaces or is in the streamline shape, and is the front end for implantation of the fusing device; the rear support segment is rectangular, with the end face of the rear end and the left and the right side faces in the rectangular shape, the upper and the lower surfaces (3) contacting the atlantoaxial joint surfaces in square shape, the middle of the upper and the lower surfaces (3) hollow, and the surfaces on both sides provided with runcinate or triangular heaves(4); the center of the front and the rear end faces of the fusing device is respectively provided with round holes (5) and (6), wherein, the round hole (6) on the end face of the rear support segment is provided with internal thread; the middle of the left and the right rectangular side faces (7) of the rear support segment is respectively provided with an elliptical hole or a rounded rectangular hole or a hole in other shapes (8). The appearance of the atlantoaxial intervertebral joint fusing device adapts to the human atlantoaxial joint clearance anatomical structure.

Description

A kind of extensive region dentata fusion of intervertebral joints device

Technical field

This utility model relates to technical field of medical instruments, is a kind of extensive region dentata fusion of intervertebral joints device.

Background technology

Articulatio atlantoepistrophica is the special construction that connects head and spinal column, is spinal motion zone the most flexibly.Pathological changes such as the congenital malformation of atlantoaxial dislocation or unstable Chang Youhuan dentata B﹠J, wound, tumor, tuberculosis, rheumatoid arthritis cause.Atlantoaxial dislocation can cause the serious spinal cord injury of patient, quadriplegia occurs, even involves important structure such as oblongata, vertebra arteriovenous, the interior arteriovenous of neck, so atlantoaxial dislocation or unsteady surgical intervention are the difficult problems of spinal surgery always.Way of escape extensive region dentata fusion is to solve the unsteady main means of extensive region dentata, and it is with internal fixation method loosening atlas and adjacent dentata to be fixed, and bone grafting also finally reaches Atlantoaxial stable to promote the extensive region dentata to merge between extensive region dentata cantle and spinous process of axis.Tradition way of escape extensive region dentata merge inner fixer comprise extensive region dentata way of escape steel wire or titanium cable tie up holder (Gallie technology and Brooks technology), interlaminar clamp inner fixer, through articulatio atlantoepistrophica gap multiple screws device (Magerl technology), extensive region dentata pedicle screw fixation device etc.Many basic research and clinical practice show that every kind of present single inner fixer all has its deficiency and defective.Steel wire or titanium cable are tied up the possibility that there is titanium cable cutting vertebral plate Spinal Cord in holder (Gallie and brook technology); The interlaminar clamp inner fixer adopts vertebral plate hook technique for fixing, though avoided wearing under the vertebral plate sport technique segment of steel wire or titanium cable, vertebral lamina hook may enter canalis spinalis and produce spinal compression; Adopt through the fixed method of articulatio atlantoepistrophica gap screw through articulatio atlantoepistrophica gap multiple screws device (Magerl technology), need tie up holder (Gallie and brook technology) with steel wire or titanium cable and combine and finish the fixing of structure behind the dentata of extensive region; Lateral mass of atlas screw and dentata pedicle screw fixation utensil have stronger biomechanical stability, but because the particularity on the dentata anatomy of extensive region, the operation technique difficulty is bigger.Above-mentioned various internal fixation mode, because of adopting way of escape bone graft fusion, the bone grafting demand is big, and plant bone mass will bear from rear tension force, and unreasonable part is arranged on the biomechanics, influences fusion rate.No matter it all is for bone-graft fusion creates conditions which kind of inner fixer, its purpose are adopted in fusion, in the limited fixedly phase, bone grafting is merged as early as possible, thereby reach Atlantoaxial fusion, make to obtain between the Atlantoaxial lateral mass joint to stablize.Previously studies show that under the physiological status, the vertical compression load between the dentata of extensive region mainly is by the downward cervical vertebra transmission of dentata both sides, extensive region lateral mass, and certain stress stimulation will promote the fusion of bone grafting.Therefore reasonably fusion should be on the lateral mass articular surface, thereby the tension force that plant bone mass will bear when removing the extensive region dentata way of escape and merging more meets the requirement of biomechanics.

In recent years, Invasive lumbar fusion device is widely used in spinal surgery, the intervertebral space that is mainly used in after neck, the intervertebral disc of lumbar vertebra excision is rebuild, its form design and intervertebral space and adjacent vertebral bodies face match, anti-skidding design is adopted on the surface, both can prevent the displacement of fusion device, and can make the intervertebral space of reconstruction obtain to stablize at once again, be a kind of implant that meets vertebral column minimally invasive surgery theory of being praised highly at present.But existing Invasive lumbar fusion device is design and is applied to down cervical vertebra and lumbar vertebra, with the anatomical features of articulatio atlantoepistrophica interstitial structure very big gap is arranged, and does not develop a kind of suitable Atlantoaxial Invasive lumbar fusion device so far yet.

Summary of the invention

The purpose of this utility model provides a kind of profile and meets the extensive region dentata fusion of intervertebral joints device that dissect in human body articulatio atlantoepistrophica gap.

This utility model is a flat hollow polyhedral, supporting section and back supporting section two parts before being divided into.Preceding supporting section is similar to the cone of being made up of four faces or for streamlined, the corner circle is blunt, smooth surface, and the front end when it is implanted for fusion device is beneficial to fusion device and implants; Back supporting section is cuboid, end face of its rear end and left and right sides face are rectangle, the upper and lower surface that contacts with the articulatio atlantoepistrophica face is square, hollow out in the middle of the foursquare upper and lower surface, to hold more plant bone mass, be beneficial to fusion, its surface, both sides whole process is provided with pawl shape or triangular hill, to prevent withdrawing from of fusion device; Respectively there is a circular hole in former and later two end face central authorities of fusion device, are beneficial to fusion, and wherein the circular hole of back supporting section end face is provided with female thread, and this screw thread and corresponding apparatus coupling are to make things convenient for controlling and implanting of fusion device.The middle hole that respectively is provided with slotted eye or round rectangle hole or other shapes, two rectangle sides can increase the bone grafting amount about back supporting section, is beneficial to bone-graft fusion and postoperative X line and observes the bone-graft fusion situation.The round angle of fusion device circle is blunt, in case fusion device damage peripheral nerve and tissue when implanting.

This utility model profile meets human body articulatio atlantoepistrophica gap anatomical structure.After implanting the articulatio atlantoepistrophica gap of both sides, thereby can make lax joint capsule produce tension force on every side and reach the stable at once of articulatio atlantoepistrophica, and, have braking, fixing and fusion fixedly making bone-graft fusion and then reach extensive region dentata fusion in the phase, can effectively treat atlantoaxial dislocation or shakiness.

Description of drawings

Fig. 1 is this utility model rear side viewing perspective view.

Fig. 2 is a side-looking perspective view before this utility model.

The specific embodiment

Now in conjunction with the accompanying drawings and embodiments this utility model is described in detail.

This utility model is a flat hollow polyhedral, supporting section 1 and back supporting section 2 two parts before being divided into.The cone that preceding supporting section likeness in form is made up of four faces, the corner circle is blunt, smooth surface, the front end when it is implanted for fusion device is beneficial to fusion device and implants; Back supporting section is cuboid, end face of its rear end and left and right sides face are rectangle, the upper and lower surface 3 that contacts with the articulatio atlantoepistrophica face is square, the middle hollow out of upper and lower surface 3, to hold more plant bone mass, be beneficial to fusion, its surface, both sides whole process is provided with pawl shape or triangular hill 4, to prevent withdrawing from of fusion device; Respectively there are a

circular hole

5 and 6 in former and later two end face central authorities of fusion device, are beneficial to fusion, and wherein the circular hole 6 of back supporting section end face is provided with female thread, and this screw thread and corresponding apparatus coupling are to make things convenient for controlling and implanting of fusion device.The 7 middle holes 8 that respectively are provided with slotted eye or round rectangle hole or other shapes, two rectangle sides can increase the bone grafting amount about back supporting section, are beneficial to bone-graft fusion and postoperative X line and observe the bone-graft fusion situation.The round angle of fusion device circle is blunt, in case fusion device damage peripheral nerve and tissue when implanting.

Embodiment 1:

The height of front and back of the present utility model supporting section is 4.5mm; The preceding long 3mm of supporting section cone, the corner circle is blunt; Back supporting section upper and lower surface 3 square length of side 8mm, middle hollow out, the left and right sides and rear side hem width are 1.5mm; Totally 8 of the pawl shape projectioies 4 on surface, tooth depth 0.5mm, tooth pitch 1mm; The diameter 1.5mm of the end face central circular hole 5 of preceding supporting section, the diameter 2mm of the end face central circular hole 6 of back supporting section, circular hole 6 is provided with female thread, two side 7 long 8mm about fusion device, wide 4.5mm, intermediary round rectangle hole 8 long 6.5mm, wide 2mm; The round angle circle of fusion device is blunt.

Embodiment 2:

Front and back of the present utility model supporting section height is 5mm, and two lateral centres are slotted eye about fusion device, and its major axis is 8mm, and minor axis is 2mm, and all the other are with embodiment 1.

Embodiment 3:

Front and back of the present utility model supporting section height is 5.5mm, and all the other are with embodiment 1.

Embodiment 4:

Front and back of the present utility model supporting section height is 6mm, and all the other are with embodiment 1.

Embodiment 5:

Front and back of the present utility model supporting section height is 6.5mm, and all the other are with embodiment 1.

This utility model can be made the different size model according to differences such as articulatio atlantoepistrophica clearance heights.

Claims

1, a kind of extensive region dentata fusion of intervertebral joints device is characterized in that being a flat hollow polyhedral, is divided into preceding supporting section (1) and back supporting section (2) two parts, preceding supporting section is similar to the cone of being made up of four faces or is streamlined, the corner circle is blunt, smooth surface, the front end when it is implanted for fusion device; Back supporting section is cuboid, and end face of its rear end and left and right sides face are rectangle, and the upper and lower surface (3) that contacts with the articulatio atlantoepistrophica face is square, the middle hollow out of upper and lower surface (3), and its surface, both sides whole process is provided with pawl shape or triangular hill (4); Former and later two end face central authorities of fusion device have a circular hole (5) and (6) respectively, wherein the circular hole (6) of back supporting section end face is provided with female thread, respectively be provided with the hole (8) of slotted eye or round rectangle hole or other shapes about back supporting section in the middle of two rectangle sides (7), the round angle circle of fusion device is blunt.