A kind of durable artificial disc after arthroplastyTechnical field
The invention belongs to field of medical products, are related to implantable orthopaedic medical treatment articles, and in particular to a kind of resistance to manually vertebraBetween disc prosthesis.
Background technique
Artificial disc after arthroplasty has on Orthopedic Clinical to be widely applied very much, also discloses some artificial vertebras in the prior artBetween disc prosthesis.
A kind of cervical artificial disc prosthese is disclosed in the prior art, and structure includes: upper soleplate, lower soleplate and is located at endAnti abrasive nucleus pulposus between plate and lower soleplate has and rotates, bends and stretches, translating three-dimensional six-freedom degree space operation range, energyThe cervical vertebra motor function for enough meeting human normal, solves the problems, such as to exist in the prior art, be disadvantageous in that: nucleus pulposus is fixedly mountedOn lower soleplate, rotation center is fixed.Cervical intervertebral disk position of its nucleus pulposus during cervical vertebral segment generates relative motion isConstantly in variation, i.e., it can provide instantaneously variable rotation center, thus fixed rotation center does not meet the rotation of human body nucleus pulposusTurn the virtual condition that center instantaneously can be changed.
One kind is disclosed in the prior art to meet human cervical spine disk natural motion mode, more meet human spine structure solutionCut open half restricted type cervical artificial disc prosthese of shape.The artificial cervical intervertebral disk prosthesis, including upper soleplate, nucleus pulposus and lower soleplate,The upper soleplate lower surface and the nucleus pulposus upper surface form cup-and-ball joint, the nucleus pulposus lower surface and the lower soleplate upper surfaceIt is bonded and forms the movable matching mechanism of grasping type with lower soleplate.The cup-and-ball joint is by the upper molding spherical groove in soleplate lower surfaceWith nucleus pulposus upper surface protrusion spherical surface dome constitute, make the upper soleplate relative to the nucleus pulposus realize it is anteflexion/extend back, left/rightThe free movement of lateral bending, left/right rotation six direction.The movable matching mechanism of grasping type is by nucleus pulposus lower surface and lower soleplateSurface is constituted；The nucleus pulposus is set to realize mobile in front, rear, left and right direction in lower soleplate upper surface and rotate around center axis,And it is not easy.
Although disclosing many artificial disc after arthroplasty in the prior art, existing artificial disc after arthroplasty is being implanted intoAfter human body, it will usually the problems such as prosthese collapses, nucleus pulposus spill and leakage and mobility reduce occur, artificial disc after arthroplasty is caused to be difficult to growPhase, which stablizes, to be used, and needs to regularly replace, and second operation can bring the dual of more health aspects and economic aspect to patientLoss.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of durable artificial disc after arthroplasty, solveThe technical problem of the durability deficiency of certainly existing artificial disc after arthroplasty.
In order to solve the above-mentioned technical problem, the present invention is realised by adopting the following technical scheme:
A kind of durable artificial disc after arthroplasty, including nucleus pulposus, nucleus pulposus are mounted between soleplate and lower soleplate, upper soleplateThe upper surface of inner surface and nucleus pulposus forms cup-and-ball joint, and the inner surface of lower soleplate and the lower surface of nucleus pulposus form cup-and-ball joint；
Buffer limit ring is consolidated on the inside of the lower soleplate, nucleus pulposus is sleeved in buffer limit ring, buffer limit ringInternal diameter be greater than nucleus pulposus outer diameter；
The nucleus pulposus includes viscoelasticity cylinder, and the upper top surface of viscoelasticity cylinder and bottom surface are consolidated with the upper of coaxial arrangementRigid spherical surface body and lower rigid spherical surface body, upper rigidity spherical surface body are contacted with the ball-and-socket inner surface of upper soleplate, lower rigidity spherical surface body andThe ball-and-socket inner surface of lower soleplate contacts；
The viscoelasticity cylinder is embedded in flexible support frame；
One layer of strengthening layer is coated on the viscoelasticity cylinder outer wall.
The present invention also has following technical characteristic:
The resilient support skeleton includes integrally formed first spring and second spring, the first spring and second springIt being symmetrical arranged by the plane of symmetry of the shaft section of junction, first spring helically reduces shape structure from top to bottom,From top to bottom, helically flaring shape structure, the bottom of the first spring connect the second spring with the top of second springTogether；The top of first spring, which is integrally formed, is provided with the first plane scroll spring supporting surface, the bottom one of second springMolding is provided with the second plane scroll spring supporting surface.
The resilient support skeleton includes elastic deeping, and elastic deeping is rolled up by center axis of the central axis of viscoelasticity cylinderAt the elasticity volume gradually opened outward from center, for elasticity volume coaxially in insertion viscoelasticity cylinder, the shaft section of the elasticity volume is flatFace scroll spring shape.
The surface of the upper rigid spherical surface body and lower rigid spherical surface body is provided with one layer of Ceramic lubricacion coating；DescribedThe ball-and-socket inner surface of the ball-and-socket inner surface of upper soleplate and lower soleplate is also provided with one layer of Ceramic lubricacion layer.
The outer diameter of the viscoelasticity cylinder is greater than the height of viscoelasticity cylinder.
The outer diameter of the viscoelasticity cylinder is three times of the height of viscoelasticity cylinder；The upper rigid spherical surface body is underThe height of rigid spherical surface body is identical, is 0.2 times of the height of viscoelasticity cylinder.
The height of the buffer limit ring is 0.4~0.6 times of the height of viscoelasticity cylinder.
The resilient support skeleton is made of marmem；The strengthening layer is using made of fibroinFiber, which is wrapped around, to be made；Upper rigidity spherical surface body and lower rigid spherical surface body are all made of rigid grease gel and are made, viscoelasticity cylinderIt is made of viscoelasticity grease gel.
The upper soleplate is identical with lower endplate structure, and the upper soleplate includes the fusion of the casing play and outer layer of internal layerLayer, casing play and fused layer are stacked together.
Coarse protrusion is provided on the fused layer.
The casing play is made of titanium alloy, and the fused layer is made of hydroxyapatite；The bufferingStop collar is also made of titanium alloy.
Installation fixation hole is provided on the upper soleplate and lower soleplate.
Compared with prior art, the present invention having the following technical effect that
(I) artificial disc after arthroplasty of the invention has the limit of buffer limit ring, so that the deflection of intermediate nucleus pulposus is unlikelyYu Tai great, when upper soleplate is contacted with buffer limit ring, as the maximum cushioning deflection of nucleus pulposus, protection nucleus pulposus will not be brokenIt is bad, prevent nucleus pulposus from collapsing.
(II) structure that nucleus pulposus of the invention is combined using rigidity and viscoplasticity, on the elastically-deformable basis for guaranteeing nucleus pulposusThe upper fricting movement ability for reinforcing nucleus pulposus and upper soleplate and lower soleplate, so that nucleus pulposus more durable.
(III) of the invention resilient support skeleton and Viscoelastic Cylindrical body are capable of the elasticity of coordinated adjustment nucleus pulposus well,Also it can guarantee the durability of nucleus pulposus；
(IV) strengthening layer of the invention can guarantee that nucleus pulposus is not destroyed during multiple flexible deformation occurs, and preventThe spill and leakage for preparing the viscoplasticity grease gel rubber material of nucleus pulposus, increases the durability of nucleus pulposus.
(V) nucleus pulposus of artificial disc after arthroplasty of the invention, upper soleplate and lower soleplate are symmetrical structure, nucleus pulposus activityFreedom degree it is big, can anterior flexion and rear stretching, left and right lateral bending and rotation, more meet body mechanics, interverbebral disc can be simulated realistically,Enable prosthese closer to true interverbebral disc, improves therapeutic effect.
Detailed description of the invention
Fig. 1 is integrally-built positive schematic cross-sectional view of the invention.
Fig. 2 is the perspective structure schematic diagram of the nucleus pulposus in embodiment 1.
Fig. 3 is the positive structure diagram of the nucleus pulposus in embodiment 1.
Fig. 4 is the perspective structure schematic diagram of the nucleus pulposus in embodiment 2.
Fig. 5 is the structural schematic diagram of the mesh sheet of embodiment 2.
Fig. 6 is upper soleplate, lower soleplate and the positive schematic cross-sectional view for buffering stop collar.
Fig. 7 is upper soleplate, lower soleplate and the schematic perspective view for buffering stop collar.
The meaning of each label in figure are as follows: 1- nucleus pulposus, the upper soleplate of 2-, soleplate under 3-, 4- buffer limit ring, 5- installation are fixedHole；
101- viscoelasticity cylinder, the upper rigid spherical surface body of 102-, rigid spherical surface body under 103-, 104- flexibly support skeleton,105- strengthening layer, 106- Ceramic lubricacion layer；
The first spring of 10401-, 10402- second spring, 10403- the first plane scroll spring supporting surface,
10402- the second plane scroll spring supporting surface, 10405- elastic deeping, 10406- elasticity volume；
201- casing play, 202- fused layer.
Explanation is further explained in detail to particular content of the invention with reference to embodiments.
Specific embodiment
Specific embodiments of the present invention are given below, it should be noted that the invention is not limited to implement in detail belowExample, all equivalent transformations made on the basis of the technical solutions of the present application each fall within protection scope of the present invention.
Embodiment 1:
The present embodiment provides a kind of durable artificial disc after arthroplasty, and as shown in Figures 1 to 7, including nucleus pulposus 1, nucleus pulposus 1 are installedBetween upper soleplate 2 and lower soleplate 3, it is characterised in that: the inner surface of upper soleplate 2 and the upper surface of nucleus pulposus 1 form cup-and-ball joint,The inner surface of lower soleplate 3 and the lower surface of nucleus pulposus 1 form cup-and-ball joint；
The inside of the lower soleplate 3 is consolidated with buffer limit ring 4, and nucleus pulposus 1 is sleeved in buffer limit ring 4, buffering limitThe internal diameter of position ring 4 is greater than the outer diameter of nucleus pulposus 1；
The nucleus pulposus 1 includes viscoelasticity cylinder 101, and the upper top surface of viscoelasticity cylinder 101 and bottom surface are consolidated with coaxiallyThe upper rigid spherical surface body 102 and lower rigid spherical surface body 103, upper rigidity spherical surface body 102 and the ball-and-socket inner surface of upper soleplate 2 being arranged connectTouching, lower rigidity spherical surface body 103 are contacted with the ball-and-socket inner surface of lower soleplate 3；
The viscoelasticity cylinder 101 is embedded in flexible support frame 104；
One layer of strengthening layer 105 is coated on 101 outer wall of viscoelasticity cylinder.
As a kind of preferred embodiment of the present embodiment, flexibly supporting skeleton 104 includes integrally formed first spring 10401With second spring 10402, the first spring 10401 and second spring 10402 are symmetrical arranged by the plane of symmetry of the shaft section of junction,First spring 10401 helically reduces shape structure from top to bottom, and the second spring 10402 is the bottom of from top toHelically flaring shape structure, the bottom of the first spring 10401 and the top of second spring 10402 link together in portion；First bulletThe top of spring 10401 is integrally formed and is provided with the first plane scroll spring supporting surface 10403, the bottom one of second spring 10402It is body formed to be provided with the second plane scroll spring supporting surface 10404.The flexible face of about 104 resilient support skeleton of the structure,For load, the intermediate big centre in spring both ends is small, is more suitable for change of the prosthese in anterior flexion and rear stretching, left and right lateral bending and rotary courseShape more meets ergonomics.
As a kind of preferred embodiment of the present embodiment, the surface of upper rigidity spherical surface body 102 and lower rigid spherical surface body 103 is all provided withIt is equipped with one layer of Ceramic lubricacion coating 106；The ball-and-socket inner surface of the ball-and-socket inner surface of the upper soleplate 2 and lower soleplate 3 is also all provided withIt is equipped with one layer of Ceramic lubricacion layer 106.Ceramic lubricacion layer 106 enables to the activity of nucleus pulposus 1 more smooth, and nucleus pulposus is avoided to be moved throughIn journey as frictional force and caused by damage, improve durability.
As a kind of preferred embodiment of the present embodiment, the outer diameter of viscoelasticity cylinder 101 is greater than the height of viscoelasticity cylinder 101Degree, the i.e. nucleus pulposus 2 of the present embodiment are flat structure.Specifically, as a kind of preferred example, viscoelasticity cylinder 101Outer diameter is three times of the height of viscoelasticity cylinder 101；Upper rigidity spherical surface body 102 is identical with the height of lower rigid spherical surface body 103,It is 0.2 times of the height of viscoelasticity cylinder 101.Such proportionate relationship enables to borrowed structure more stable, more meets human bodyEngineering science.As the preferred case of one of the present embodiment, the height of viscoelasticity cylinder 101 is 5mm.
As a kind of preferred embodiment of the present embodiment, the height of buffer limit ring 4 is the height of viscoelasticity cylinder 1010.4~0.6 times.Height within the scope of this is unaffected in the movement for guaranteeing nucleus pulposus 1, meets the basic doctor of artificial disc after arthroplastyOn the basis for the treatment of purposes, it can farthest guarantee nucleus pulposus 1, prevent nucleus pulposus from collapsing.
As a kind of preferred embodiment of the present embodiment, flexibly supports skeleton 104 and be made of marmem；DescribedStrengthening layer 105 is wrapped around using fiber made of fibroin to be made；Upper rigidity spherical surface body 102 and lower rigid spherical surface body 103It is all made of rigid grease gel to be made, viscoelasticity cylinder 101 is made of viscoelasticity grease gel.Above-mentioned material is also for mentioningThe overall durability of high prosthese and it is preferred that obtain.
As a kind of preferred embodiment of the present embodiment, upper soleplate 2 is identical with lower 3 structure of soleplate, and the upper soleplate 2 includesThe casing play 201 of internal layer and the fused layer 202 of outer layer, casing play 201 and fused layer 202 are stacked together.Both it ensure that intensity,The histocompatbility of prosthese and human body is improved again.
As a kind of preferred embodiment of the present embodiment, coarse raised 203 are provided on fused layer 202.Coarse raised 203 shapeAt rough surface be connected with the intracorporal centrum of people it is more firm.It is provided with installation fixation hole 5 on upper soleplate 2 and lower soleplate 3, usesScrew is fixed.Casing play 201 is made of titanium alloy, and the fused layer 202 is made of hydroxyapatite；The bufferingStop collar 4 is also made of titanium alloy.Above-mentioned material is also for the overall durability for improving prosthese and it is preferred that obtain.
Upper soleplate 1 and lower soleplate 2 when in use, are fixed on human body by screw by the durable artificial disc after arthroplasty of the present inventionOn corresponding position, for patient in normal physiological motion, upper soleplate 1 and lower soleplate 2 can generate relative motion with the movement of human body,It squeezes so that flexible deformation can occur for nucleus pulposus 1, nucleus pulposus 1 also can carry out rubbing for lower resistance relative to upper soleplate 1 and lower soleplate 2 simultaneouslyIt slips dynamic, sometimes can also rotate.Compared with the use process of conventional artificial disc after arthroplasty, the artificial intervertebral disk of the applicationProsthese is not due to having the connection relationship of strength between nucleus pulposus 1 and upper soleplate 2 and lower soleplate 3, so freedom degree is more in motion processIt is larger, the movement of various human bodies can be more suitable for.
Embodiment 2:
The present embodiment provides a kind of durable artificial disc after arthroplasty, as shown in Figures 1 to 7, the structure of structure and embodiment 1Essentially identical, difference is only in that resilient support skeleton 104 is different, and the resilient support skeleton 104 in the present embodiment includes elasticityMesh sheet 10405, elastic deeping 10405 are rolled into the bullet gradually opened outward from center by center axis of the central axis of viscoelasticity cylinder 101Property volume 10406, for elasticity volume 10406 coaxially in insertion viscoelasticity cylinders 101, the shaft section of the described elasticity volume 101 is planar vortexCoil spring shape.104 global consistency of resilient support skeleton of the structure is good, has both elasticity and stability, durability are more preferable.