CN103006356B - A kind of bionic type hydraulic movable artificial vertebral body - Google Patents

The present invention discloses the bionic type hydraulic artificial vertebral body design that a kind of backbone physiological function is rebuild, it includes including piston (13, 14) the cylindricality artificial vertebral body main body of hydraulic bag (10 11) core texture, piston both ends are half ellipse (ball) shape kinematic axis (21, 22) soleplate (24 up and down that structure matches, 25), artificial vertebral body soleplate is with normal adjacent vertebral bodies soleplate flat board (cement reaction) or with the fixing glue of metal micro-holes and biomaterial coating micropore (bion is fixed) thorn (31, 32) structure, centrum trailing edge can be further with the neck (40 of pedicle of vertebral arch bail (45) fixed structure, 41) it is fixed on pedicle of vertebral arch；The design of this artificial vertebral body further can turn to fluid pressure type artificial intervertebral disk design (60) by micro.

A kind of bionic type hydraulic movable artificial vertebral body

Technical field

The present invention relates to a kind of medical device, the bionical of backbone physiological function is rebuild after particularly a kind of spinal defect lesion Type hydraulic movable artificial vertebral body.

Background technology

Spinal fusion techniques are the main flow ideas of modern spinal surgery, and good face is played in spinal defect lesion is treated Bed effect.

Clinically pattern of fusion artificial vertebral body is used for burst comminuted vertebral fracture and vertebral tumor more, rebuild missing Pyramidal portion, and clinically the lesion execution centrum excision post-fusion of a section centrum will lose two interverbebral disc functions, that is, melt The centrum of at least three sections is closed, sacrifices the motor function of original spinal vertebral interverbebral disc.

With the extensive clinical practice of spinal fusion, the forfeiture of complication and spinal function after fusion is brought new Problem increasingly shows so that clinician progressively recognizes the possibility and necessity that backbone original function is rebuild：Multi-segmental vertebra Body fusion easily produces straight back of the body deformity, because of the loss of interverbebral disc function so that the change of the original mechanical property of backbone, in fusion vertebra The interverbebral disc at body both ends can produce acceleration regression, the skill that the loss of cervical vertebra motor function and operation are brought in itself after Cervical Fusion Art problem.

The invention of artificial vertebral body recognizes the structure and mechanical characteristic and social ring residing at that time of backbone with application with people Border is horizontal related to manufacturing.Initial artificial vertebral body is applied to cervical vertebra, is a metal ball, is placed in the cervical intervertebral disk of excision Place, but there is the displacement spherical cervical intervertebral disk in position and is absorbed in centrum in the patient replaced immediately, and vertebral height is lost, compression of spinal cord.Its Afterwards, various countries clinician did effort to intervertebral disc replacement operation and attempted, and including Bryand cervical intervertebral disks, designed Various sample artificial vertebral bodies or interverbebral disc, but because the limitation recognized spine structure, in the presence of its shortcoming.

Fusion and spinal function reconstruction operations history and clinical gain and loss are looked back, when we are related in progress interverbebral disc and backbone When operation, it is necessary to the further structure and mechanical property of understanding centrum interverbebral disc.How could more science understanding The structure of spinal vertebral and interverbebral disc and mechanical characteristic

Many phenomenons can clinically be seen：Why spine fracture, which is more common in soleplate fracture, collapses and rare lower soleplate Fracture collapsesAcute violence act on the common vertebral fracture of backbone and rare nucleus pulposus protrude (except original intervertebral disc degeneration, Cervical vertebra can merge cervical intervertebral disk avulsion protrusion)Intervertebral disc degeneration protrude see strain and it is rare in wound sexual violence (be often have it is slow Once unexpected strain or prudent thing cause disc herniation after property pain in the back)Intervertebral disc degeneration is that fibrous ring regression first occur also It is Nucleus PulposusShumor tubercles are more common in Thoracolumbar disk interverbebral discThe common Lumbar Intervertebral Disc Degeneration of lower lumbar spine, age of onset group are common In person between twenty and fiftyThe disc herniation incidence of disease is reduced trend after the increase of human body ageIn gerontal patient, there is lymphogranuloma inguinale shape in centrum Wedge shape becomes, and interverbebral disc turns into elliposoidalIntervertebral disc degeneration is occurred in lower lumbar spine gap, and upper lumbar spine is rareInterverbebral disc moves back Occur Black interverbebral disc phenomenons after change, interverbebral disc trailing edge MRI may occur in which highlighted signal signThe centrum of lumbar instability occurs Modic signsGerontal patient's vertebral fracture easily occur and nervous symptoms not as between twenty and fifty patient it is common.

WhyThere can be unified understanding

All these lesions or phenomenon whether have in it essential connectionWhether these lesion rules have in its structure Internal causeHow to disclose and recognize these phenomenonsMedical proceduresBiological method

Here, analyzed by superficial geometry principle with physics principle.

Human body is the evolution body of nature, by Action of Gravity Field.Human body produces two that good motor function depends on human body Big structure：The coordinated movement of various economic factors that bone structure balances with muscle is balanced, and the complicated body movement of human body is produced under nervous system domination, Such as work, wushu, gymnastics.Organization of human body has the one side of physics characteristic, and human motion equally follows Principle of Natural Science.

The complete Chinese of the tool of observation 10 dries N/D spinal vertebral sample (man 6, female 4), and minimum scale is 0.5 millimeter of steel Graduated scale, the measurement centrum most wide transverse diameter L and most long radius vector H in section.

Spinal vertebral cross section structure：C₂Lower section is to S₁Upper section, cervical vertebra 11, thoracic vertebrae 24, lumbar vertebrae 11 totally 46 sections.C₂ To T₃Section approximation bean cotyledon shape ellipse, T₄To T₁₂Approximate peach-shaped, L₁To S₁The section approximation shape of a hoof, adjacent several in these sections He Xue is similar and continues.Thus, it is possible to made an explanation using mathematics and physics principle.

Here, introduce the 1st geometry mathematical principle：Similar area ratio is equal to the ratio between any corresponding cross spider product.

The architecture basics in spinal vertebral section：Interverbebral disc adjacent vertebral horizontal cross-section structural similarity meets plane geometry phase Like principle is learned, i.e.,：Ellipse area S=π * a*b (a, b are respectively oval two radius), thus estimate that centrum area of section is S =π * L/2*H/2 (L*H is area index, and π is pi, is a constant, and each centrum section is approximately ellipse, here, A standard ellipse, face between standard ellipse geometric figure and actual centrum sectional view are done by parameter of the transverse diameter radius vector in centrum section Product usable area approximation is cut reinforcing method and changed：The area that pyramidal portion is marked in i.e. oval front can use centrum section rear and quilt Oval phase cuts part, and mutually filling is offset, and thus obtains approximate centrum sectional area).

π is pi, is a constant, thus can further simplify area relationship, i.e. area between mutual each centrum section Index K_S=transverse diameter (L) × radius vector (H).

Intervertebral disc structure periphery is fiber ring seal, and inside is the nucleus pulposus collagen tissue containing 80% or so moisture, nearly centrum Be cartilage endplate at soleplate, and with cortical endplate close proximity.Whole intervertebral disc structure enriches again for the aqueous of a closed state Macromolecule nucleus pulposus with certain space elasticity.Liquid hydrone has the physics characteristic of its own：In confined conditions Meet hydrostatics action principle again；The flexible physics characteristic of nucleus pulposus collagen tissue, i.e., Hooke physically are determined Rule, to external force having time cushioning effect.

Thus, the 2nd physics principle is introduced：Hydrostatics pressure transfer law：After enclosed liquid is acted on by external force Pressure is converted to, the external active area size that the external amount of force in enclosed liquid inside contacts with enclosed liquid is relevant, I.e.：P=F/S=F₁/S₁=F₂/S₂。

The change of enclosed fluid internal pressure functions both under malleation, negative pressure, and suction function is such as Magdeburg hemispheres, i.e., Direct draught enclosed liquid is both needed to overcome equal big low-force with enclosed liquid under negative pressure.Aqueous abundant complete closed interverbebral disc Interior pressure oscillation causes backbone to turn into a continuous mechanical function body passed through, i.e., the stress of backbone one end is by by the mechanics of enclosed liquid Other end transmission of the rule along backbone to stress, and transmittance process intradiscal pressure meets the change of hydrostatic hydraulic pressure.

In same spinal disc interior, pressure P is equal, and hypocentrum stress size is thereon：F₁=P*S₁(S₁=π * L₁/ 2*H₁/ 2), F₂=P*S₂(S₂=π * L₂/ 2*H₂/2).Thus, centrum stress is with centrum and interverbebral disc contact area size Centrum area of section size is consistent, i.e.,：Centrum-interverbebral disc section stress index is reduced to K_F, K_F=L*H, i.e., refer to area Number is numerically equal, related to centrum transverse diameter radius vector product size in measurement.Here, show that a reasoning is contemplated：Human spine The static pressure of interverbebral disc is equal (causing centrum to be moved to the low side of pressure if not waiting and pressure difference necessarily occur).

To sum up, by above-mentioned two mathematics-geometry, mathematics-physics principle reasoning, on understanding backbone Laws of Mechanics, The effect core of power is closed interverbebral disc, and is not the centrum of usual operation lesion.Thus establish with interverbebral disc Centered on, adjacent vertebral forms the motion structure unit of backbone, carries out the analysis of structure and sport dynamics, interverbebral disc is " backbone Stress hinge ", its structural area S=(π/4) * L*H, π/4 are a constant, with stress F=P*S=P* (π/4) * L* H, P is equal in interverbebral disc, and π/4 are constant, a variable be present, can use area of section-stress index K expression, K=L*H.

The result measured by the above method, spinal vertebral up and down area of section index from C₂Lower section-L₄Lower section is in incremental Curvilinear motion, to L₄Centrum lower section area reaches maximum；L₄Lower section is to S₁Upper section product is successively decreased.Each corresponding centrum of women Area of section is slightly less than male, and variation tendency is identical.

Centrum-interverbebral disc area index K_S=L*H；Centrum-interverbebral disc section stress index K_F=L*H.Centrum section is horizontal Footpath radius vector can calculate the area index size variation (the results are shown in Table 1) in each section.

Each area of section of the centrum of table 1-stress index results

Cancellous bone is the trabecular bone structure of spatial networks branch in centrum, and centrum periphery is that the structure containing cortex bone is (this Mesh space structure is the adaptation result on backbone mechanics：Maximum mechanics peptizaiton and most light and handy own wt structure phase It is unified；Interior spatial structure is optimal storeroom again rich in liquid blood, carries out bio-regeneration and metabolic function etc., Meanwhile the blood flow of relative closed state produces the physics characteristic of hydraulic pressure again), it is endplate cortical at nearly terminal plate of vertebral body, The hard cortex bone of centrum periphery plays to centrum is supported in fixed protective effect；At nearly soleplate it is endplate cartilage in interverbebral disc, Periphery is fibrous ring, and center is nucleus pulposus.The external mechanical property of complete cone structure is close to mechanical rigid body；Interverbebral disc is near Like hydraulic pressure structure closed and with certain elastic reaction.

According to the measurement of soleplate transverse diameter radius vector above and below above-mentioned centrum and analysis and geometry physics principle, can therefrom draw Following rule explains related clinical picture：

1st, human spine terminal plate of vertebral body area of section is from C₂Lower section is to L₄Lower section gradually increases, L₄Lower section is to S₁On Section is successively decreased again, and correction anatomically thought spinal vertebral sectional area S in the past₁For the wrong understanding of maximum area；L₄Lower section Face maximum has its anatomical basis, anatomically most people L_4、5Intervertenral space is parallel with crista iliaca, and crista iliaca decomposes and undertakes human body A part of strength of trunk, i.e. stress force shelter reaction, objectively reduce the pressure stresses to level vertebral.

2nd, this structure law of human spine also has the Special Significance of its biological evolution.Human body is upright walking life Object.In motion process, momentum MV is produced, the vertical momentum mv for prolonging bone transmission is acted on backbone, the conversion of this momentum For momentum fT.Separately, sectional area S size determines that interverbebral disc stress is big to the viscoelastic structure of each section of backbone and interverbebral disc Small, human spine centrum section is successively decreased by lumbar vertebrae to cervical vertebra, and ground also successively decreases therewith in face of the recoil active force of human body head, favorably Along the impulsive force of bone upload when protecting brain from walking.When being caused vertebral fracture by ultraviolence effect, burst or press The fractured vertebral body of contracting loses the continuity conduction function of original mechanics；On the other hand, in the moment of the power caused by the vertebral fracture It is disconnected, vital center brain is protected, prevents bigger violence is directly transmitted from acting on brain and fatal.

3rd, using interverbebral disc as backbone mechanics study center, " the stress hinge of backbone ", the upper endplate area of interverbebral disc is less than Its next endplate area；Establish and can reveal that backbone Laws of Mechanics and most clinical doctor by mechanics study center of interverbebral disc Learn phenomenon.Spine fracture is under the active force of Relative vertical backbone, and interverbebral disc is by the active force of upper hypocentrum, internal pressure wink Between increase, but nucleus pulposus collagen in interverbebral disc, delayed with reference to producing elastic potential energy transformation between water, cartilage and fibrous ring Punching, interverbebral disc can bear huge impulsive force, and the potential energy and hydrostatic pressing of nucleus pulposus moment discharge the caused pressure to terminal plate of vertebral body, Neighbouring terminal plate of vertebral body is reacted on, suffered power is acted on Intrapyramidal Grafting Cancellous Bone Bolt girder, local bone trabecula deficiency by soleplate Local fracture is produced to bear moment huge active force, this local fracture produces under huge interverbebral disc action of compressive stress The domino effect of moment, the instant exploding inside centrum, the terminal plate of vertebral body up and down with interverbebral disc adjoining, stress are larger Interverbebral disc bottom centrum is inevitable first to occur collapsing for burst, the advantage function principle of nature power：Power is always to minimum resistance Destruction occurs for position, ultimately results in the centrum explosion of backbone.Here it is clinically spine fracture to be more common in the upper soleplate of centrum The backbone mechanical structure basis of fracture.

4th, the structure of interverbebral disc and regression

L_4、5And L₅S₁More than 96%, C of the clinical protrusion of the intervertebral disc is accounted for based on gap_5、6, C_4、5It is between cervical vertebra on cervical vertebra The Major Segments of disc degradation, it is main motion segment in the motion of corresponding section, and its structure is Human Physiology lordosis Summit, the namely summit of stress naturally, turn into the position of stress strain.

Crista iliaca and L_4、5Interverbebral disc is parallel, in L_4、5Form trunk bone triangle and form mechanics with lower limb skeletons triangle Turn point of contact, the rotation of human body waist is with movable finally in L_4、5Collect；L₅S₁Regression and mechanics point of contact bent before human body lumbar vertebrae physiology Correlation, while the Action of Gravity Field of trunk is finally in L₅S₁Turn point of contact in formation.Because of L_4、5Intervertenral space on crista iliaca plane, The major function activity that subject the rotation of body top half and bend and stretch, L_4、5It is easiest to regression clinically occur, with L₅S₁ Because the shear stress regression after crista iliaca stress shielding mainly due to backbone itself axial force is different, L₅S₁The regression of interverbebral disc L is had no on imaging observation_4、5Gap is destroyed serious.The effect of revolving force produces drawing torsion to annulus fibrosus disci intervertebralis and broken Bad effect, cause small avulsion fracture tear of the annulus fibrosus disci intervertebralis in centrum trailing edge (centrum trailing edge fibrous ring is weak), fiber The small avulsion fracture of ring causes the original airtight performance of interverbebral disc to destroy.This performance can obtain very well in industrial jack Explain, jack machinery hydraulic performance decline or loss caused by jack oil leakage phenomenon occurs after using long.After the increase of interverbebral disc volume Original mechanical performance declines therewith, and causing adjacent vertebral to act on the original hydrostatic pressing of nucleus pulposus reduces, mechanical presses Effect increases, and the combination water in nucleus pulposus is changed into free water, and the dehydration denaturation of nucleus pulposus causes Black interverbebral disc phenomenons, can existed simultaneously On MRI, there is " water droplet " image of high RST in interverbebral disc rear；Local stress, which acts on, causes spinal disc cartilage and periphery because original Keeping passage destruction, aseptic chemistry pro-inflammatory cytokine is produced under oxygen free condition, local nerve, production are stimulated into local organization Raw clinical pain in the back symptom.When regression continues, nucleus pulposus dehydration further aggravates, and the space increase in interverbebral disc, neighbouring centrum rushes Active force increase is hit, the clinical regression symptom of two kinds of approach can occur：Annular Tear aggravate, nucleus pulposus because trunk flexing stress to Interverbebral disc rear protrudes, and clinic produces Nucleus pulposus compressing intervertebral foramen nerve and produces sciatic nerve symptom, and this symptom is most common It is to occur after chronic low back strains after a heavy physical labour；Intervertenral space is because the nucleus pulposus effect of being squeezed, moisture are further lost, vertebra Disc space further expands, and clinic produces degenerative lumbar scoliosis shakiness, causes interverbebral disc mutually to produce effect of impact adjacent to centrum, Regression occurs for terminal plate of vertebral body, causes the direct collision of degeneration intervertebral disc adjacent vertebral bodies to act on, the micro fractures oedema production inside centrum Raw Modic signs clinically.Structure is destroyed between the damage of intervertebral disc structure causes centrum, i.e., between the articular process of adjacent vertebral Textural anomaly, the change of local mechanical structure is thus produced, cause the regression hyperplasia of articular process cartilage and ligament.

In the case of spondyloschisis lumber spondylolisthesis, interverbebral disc ligament loses the rock-steady structure of bone, acted on by external force Regression becomes apparent.Intervertebral disc degeneration further aggravates nucleus pulposus loss of moist and interverbebral disc volume is further reduced, original power Learn architecture basics to destroy, clinic produces Degenerative spondylolisthesis.

In chest waist section, backbone interverbebral disc is based on the stress of vertical direction, when centrum self structure exception, such as blood in centrum Pipe causes vertebral cancellous abnormal bone structure extremely, and under the effect of backbone vertical direction stress, terminal plate of vertebral body strength can not provide vertebra Disk supports pressure, nucleus pulposus occurs and is charged into centrum, be i.e. the mechanical foundation of Shumor tubercles, therefore, Shumor tubercles are recognized To be the calcification of the terminal plate of vertebral body cartilage or few fibers ring that collapse.

5th, terminal plate of vertebral body deformation and senile centrum regression

The image check of MRI, X piece etc. observes terminal plate of vertebral body with the age and engenders deformation.The vertebra of most the elderlys Body soleplate is curved, and arc is showed in the crowd of osteoporosis and become apparent towards centrum direction, severe patient's terminal plate of vertebral body It can be in Pisces mouth shape.In geometry, sphere object has maximum surface area.In physics principle, area increase, thing is added Active area between body.This rule then adds the active force to centrum in interverbebral disc and vertebral body structure.Centrum bone trabecula Structure provide centrum mechanical support power.When the factors such as old body degeneration move back centrum in-seam girder bone loss, sclerotin Becoming bone trabecula mechanical performance reduces, and causes supporting role of the bone trabecula to terminal plate of vertebral body to decline, the degeneration of body causes cancellous bone Interior hematopoiesis function declines, and hydraulic performance also declines therewith caused by Intrapyramidal blood, i.e. the complete external mechanical property of centrum Reduced with the aging of body；Interverbebral disc is because the change of original endplate structure, moisture increase into interverbebral disc, interverbebral disc water Divide the rigidity increase that increase directly results in interverbebral disc, interverbebral disc is produced spherical change, the interverbebral disc endplate surface product increasing of spherical change Greatly, terminal plate of vertebral body active force is also increased, i.e.,：F=P*S, thus destroy hydrostatic pressing in the interverbebral disc of terminal plate of vertebral body interface with The balance of centrum sclerotin supporting force.In vertebral body structure, centrum periphery is cortex bone, and inside is cancellous bone, mechanical structure Basis is better than among centrum for centrum periphery mechanical support, old vertebral cancellous bone bone loss, causes under centrum mechanical property Drop, the micro fractures of centrum interior cancellous bone can not be repaired in time, in dmm under terminal plate of vertebral body active force, centrum Inside is fractured, and final terminal plate of vertebral body regression is concave surface arc.In iconography MRI, it is seen that interverbebral disc change spherical in shape, moisture Content increase.In elderly population, because of interverbebral disc moisture varying, volume increase, squeezing action power of the terminal plate of vertebral body to interverbebral disc Decline, the clinically patient of intervertebral disc degeneration herniation of nucleus pulposus more between twenty and fifty reduction on the contrary.

6th, moisture change is adjusted with pressure in normal disc

Human intervertebral disc is the nucleus pulposus collagen structure that moisture is rich in fiber ring seal, and centrum is up and down endplate cartilage.Vertebra Hydrone discrepancy concrete ways are still not clear at present in disk, thus it is speculated that under different stress conditions, hydrone is in interverbebral disc Combined by the polarity of terminal plate of vertebral body carrtilage space or hydrone with organic macromolecule with separating disengaging interverbebral disc, a small amount of moisture Discrepancy in sub- interverbebral disc, the needs of physiologically substance exchange, what is more important moisture disengaging interverbebral disc, and fibre are not only completed It is flexible to tie up ring structure, can make interverbebral disc volume that few micro change occur, for the interverbebral disc in moment under by external force high pressure conditions It is particularly important, on the one hand interverbebral disc volume is adjusted, on the other hand also backbone intradiscal pressure is adjusted, makes marrow Core is completed elasticity-hydraulic cushion with water and changed, and discharges the quick-fried power effect of moment；On the other hand, acted as with terminal plate of vertebral body cartilage one With destruction of the buffer limit pressure to terminal plate of vertebral body.This namely clinically common vertebral fracture under violence effect, it is and rare Disc herniation (except existing annulus fibrosus disci intervertebralis Nucleus Pulposus).Thus reasoning, the destruction of interverbebral disc is intervertebral disc degeneration Architecture basics, the operation for protrusion of the intervertebral disc patient, fiber ring structure after the interverbebral disc that the partial enucleation of interverbebral disc destroys Protruding again for interverbebral disc will necessarily be caused.

7th, centrum self structure

Complete cone can be realized as rigid body to be continued to the mechanics of interverbebral disc, but the space multistory of centrum inside itself is netted Structure, on the one hand to comply with each side's strength and decompose each side's strength, the blood sinus that inside is full of not only provides the metabolism of vertebral cancellous bone, The liquid physics characteristic of blood also provides the hydraulic pressure relief function on mechanics；On the other hand, this structure is in extreme external force Under effect, there is wink because the local fracture of centrum bone trabecula may occur in which Domino effect in the space multistory network structure of vertebral bone Between burst, the impulsive force of centrum internal liquid (mainly blood) explosion is the mechanical foundation (nerve of spine fracture neurotrosis Damage is more caused by the impulsive force of centrum internal liquid, the follow-up damage after the compressing mostly fracture of bone piece, between twenty and fifty centrum Bursting fracture stress is big, and the probability of spinal cord injury is much larger than the spine fracture of gerontal patient, the osteoporotic fracture of gerontal patient It is light or few on the contrary to occur nervous symptoms relative during bone piece Spinal canal encroachment afterwards).

The content of the invention

According to above-mentioned understanding reasoning, backbone interverbebral disc-centrum mechanics using interverbebral disc as " stress hinge " is herein proposed Complex structure model.

The purpose of the present invention is：Segmental missing problem caused by being fractured for clinical spinal vertebral, caused by tumour The full vertebral fracture of pathologic collapses and the treatment of the clinical column reconstruction of serious bursting fracture of vertebral body provides a kind of reconstruction backbone The bionic type hydraulic movable artificial vertebral body of physiological function, rebuild backbone physiological function.

The technical scheme is that：Structure includes the mobilizable joint spline structure (20-21) in both ends, fluid pressure type cylindricality master Body (12), wherein fluid pressure type cylindrical bodies are centrum columnar shape, are the core structure of this piston type biomimetic prosthetic vertebral body structure, Both sides piston space is closed high-molecular biologic glue；Both ends piston is an ellipsoid connected in star, there is the bead of an antiskid in groove Shape post (20,23), ellipsoid connected in star match with soleplate connecting plate convex ellipsoid, form the movable structure of this centrum design, Soleplate position is plane (cement reaction) or the barbed fixed structure of micropore (bion is fixed), with neighbouring normal vertebral body soleplate Reach integral fixation.

The manufacture material of the bionic type hydraulic movable artificial vertebral body of the reconstruction backbone physiological function of the present invention is compound Type, the limiting plate being connected with terminal plate of vertebral body and artificial vertebral body post can use clinical conventional biocompatible materials, as cobalt chrome molybdenum closes Gold, titanium alloy, tantalum, bioceramic, polyethylene etc., as artificial hip joint, knee joint structure are mutually combined composition；Core component Hydraulic means is that the closed capsule of superpolyester biomaterial is formed with internal biocompatible polymer biological sol.

The bionic type hydraulic movable artificial vertebral body that the present invention rebuilds backbone physiological function is mainly used in spine fracture The reconstruction operations of centrum missing.Operating procedure is roughly the same with clinical existing spinal fusion type artificial vertebral body implantation.

The pedicle of vertebral arch bail of the bionic type hydraulic movable artificial vertebral body of the reconstruction backbone physiological function of the present invention can lead to Cross artificial vertebral body that percutaneous cervical arc root screw technology is fixed on pedicle of vertebral arch the fixed present invention in itself, prevent the design artificial vertebral body Sliding.

The hydraulic pressure composite construction of the present invention is the technological core of the design, and the critical technological point of the design.Mechanical industry Well-known saying：" obtaining hydraulic pressure person to get the world ", hydraulic pressure is in the technology emphasis that each field such as industry, war industry is all mechanical industry, use In various mechanical buffering and mechanicals efforts conduction (undercarriage of aircraft, the arrester wires of aircraft carrier, tank it is buffer bed etc. Deng).In human body, the hydraulic function of spinal vertebral-interverbebral disc can not reach complete function substitution with the industrial level day after tomorrow, strong Muscles and bones be organism adapt to the Nature evolve with the day after tomorrow take exercise (body development maturity period of the human body before 20 years old) result, it is tough Band originating from bone and be better than bone, there is powerful mechanical function, here it is muscle can knochenbruch and muscle is continuous.Modern industry still can not be real The durable applications of existing shearing force between flexible closed water-fast laminated structure and rigid objects.Correct posture is to reduce body regression The optimal way to keep in good health.Natural interverbebral disc is one lifelong, having hydraulic function, flexible in human body interior mechanics performance The structure of pooling feature.It is contemplated that recognizing the biomethanics construction of backbone in theory, the interverbebral disc work(of nature is continued to use Energy：Strength can be converted to pressure by closed hydraulic structure, with conducting strength according to its contact area during solid contact, be reached Bionical bion structure.

The present invention rebuilds the bionic type hydraulic movable artificial vertebral body of backbone physiological function, is adopted with terminal plate of vertebral body contact surface With two elliposoidals (or spherical) structure matching, it is therefore an objective to go back the micromotion structure of interverbebral disc between archecenra.

Advantages of the present invention：

The present invention rebuilds the bionic type hydraulic movable artificial vertebral body of backbone physiological function, by there is the material of biocompatibility Material combination is made, and when rebuilding the support to backbone, recovers the physiological movement function of backbone, reduces the remote of pattern of fusion artificial vertebral body Phase intervertebral disc degeneration and iatrogenic backbone is stiff and the regression at a specified future date of adjacent discs；A understanding backbone has been found in theory The thinking of biomechanical property.

While advantage compared with prior art, it may have its own the shortcomings that：

1st, the present invention only in theory propose backbone technology innovation, on existing industrial technology far from reach from The physiological function of right backbone；

2nd, the present invention only proposes the imagination to human spine mechanics reconstruction on mechanical structure, and centrum is not complete The reproduction of full biological function (metabolism, hematopoiesis function etc.).

Perfect spinal function reconstruction technique is the centrum-interverbebral disc complex allosome displacement for carrying out biological allosome, but i.e. Just in this way, there are still biological antigens, transmission, the destruction of original backbone integrality, initial unstable etc. factor Defect.

Brief description of the drawings

Fig. 1, corpus vertebrae transverse diameter, radius vector measurement diagram；

Fig. 2, sample centrum transverse diameter, radius vector measurement result；

Fig. 3, sample centrum area-pressure index；

Fig. 4, centrum area-pressure index statistical chart；

(carrying pedicle screw) is seen in Fig. 5, the design artificial vertebral body entirety side；

Fig. 6, the design artificial hydraulic pressure centrum overlook, normotopia, side position perspective, vertebral pedicle bolt structure diagram；

Fig. 7, the design artificial vertebral body and pedicle screw connected structure illustrate；

Fig. 8, the design vertebral pedicle bolt structure；

Fig. 9, the design artificial hydraulic pressure centrum Facad structure diagram；

Figure 10, the design artificial hydraulic pressure centrum side structure diagram；

Figure 11, the design artificial hydraulic pressure intervertebral disc structure diagram；

Figure 12, the design embodiment diagram.

It is attached：Structural representation illustrates：

10 --- high-molecular biologic glue hydraulic bag；

11 --- cyst wall；

12 --- centrum column jacket；

13rd, 14 --- piston；

20th, 23 --- cleat；

21st, 22 --- axle moves hemisphere；

24th, 25,26,27 --- the upper and lower soleplate of artificial vertebral body (different parts front and rear edge difference in height, can be contour)；

31st, 32 --- the upper and lower soleplate nail thorn of artificial vertebral body；

40th, 41 --- vertebral notch；

42 --- pedicle of vertebral arch bail head；42-1 --- pedicle of vertebral arch bail head is rotated by 90 ° diagram in centrum neck；

43 --- pedicle of vertebral arch bail afterbody hold-doun nut；

44 --- pedicle of vertebral arch bail tailing screw flight；

45 --- pedicle of vertebral arch bail outer barrel；

46 --- pedicle of vertebral arch bail nose threads；

47 --- pedicle of vertebral arch bail tail end bolt；

60 --- fluid pressure type artificial intervertebral disk；

61 --- high-molecular biologic glue；62 --- piston plate；63,64 --- movable axis composite construction.

Embodiment

After lesion vertebral resection, this example artificial vertebral body is inserted, percutaneously pedicle screw is inserted and fixes this example Artificial vertebral body.Art finishes.