Biotype cervical vertebral fusion cageTechnical field
This utility model belongs to field of medical materials, in particular, relates to a kind of medical operation implant, belongs to III class medical apparatus and instruments, is the biotype cervical vertebral fusion cage for anterior cervical operation.
Background technology
From Robinson-Smith and Cloward, the 1950's, start anterior cervical decompression bone graft fusion (Anterior cervical decomposition and fusion, ACDF) since, because this art can effectively be removed the fragment of dashing forward to intervertebral disc, hypertrophy hyperosteogeny and fracture before canalis spinalis, and bone-graft fusion simultaneously, therefore be widely used in treatment cervical spinal trauma, tumor, cervical spondylosis.
Traditional bone grafting method adopts three cortical bones of autologous ilium, but the incidence rate of self-iliac bone grafting complication is high, Sawin(Sawin PD, Traynelis VC, Menezes AH.A comparative analysisi of fusion rates and donor-site morbility for autogenetic rib and iliac crest bone grafts in posterior fusion.J neurosurgery, 1998; 88:255-65.) etc. the incidence rate of report self-iliac bone grafting complication is 25.3%, and these complication comprise blood loss increase, hematoma, Gong Gu district pain, fracture of ilium, thigh portion paraesthesia etc.; After self-iliac bone grafting, often because undercapacity subsides, directly affect size and the effect of easing stress of vertebral canal volume.
In recent years, titanium alloy Invasive lumbar fusion device (Cage) is used widely in anterior cervical operation, Cage is that the physiology that pyramidal support is recovered to cervical vertebra by its external structure is bent degree and height, because the contact surface (being stress surface) of Cage and vertebral body is limited, stress is relatively concentrated, and need to destroy the soleplate of hypocentrum, postoperatively cause that vertebral body is caved in, malunion, stenosis of disc space; Titanium alloy Cage, has sufficient intensity, but it is vertebral body spongy bone up and down, and both elastic modelling quantity are inconsistent, and vertebral body spongy bone can partially absorb because bearing pressure, makes the height of postoperative intervertebral space extend in time and have partial loss; Support is permanent implanted, may produce electrolysis, foreign body stimulates, and to patient, brings mental burden.The complication relevant with cervical fusion cage is worth causing concern, comprising: the sinking of fusion device causes the dislocation of Cage subsidence, fusion device, do not merge the cervical vertebra shakiness that causes etc.
In addition, polymeric material causes scholar's extensive concern, has report to adopt plastics as the cervical vertebral fusion cage of nylon, polyether-ether-ketone, increase with the biocompatibility of human body, but implant still long-term existence in human body, produce foreign body reaction in various degree.
In sum, in anterior cervical decompression fusion, self-iliac bone grafting is high for district's complication rate, titanium alloy Cage can cause collapse of vertebra, therefore, the crucial part that improves anterior cervical decompression fusion rate is to select desirable implant, and desirable implant should elastic modelling quantity approaches skeleton, have bone inductive effect also has bone conduction effect, and implant can cause new bone formation and can support it to grow into simultaneously.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, provides that a kind of compatibility of making by animal bone is good, mechanical strength mates, promotes the biotype cervical vertebral fusion cage that area of new bone is grown into skeleton.
This utility model is achieved in that biotype cervical vertebral fusion cage, is blocks, and described blocks surface is provided with projection, to strengthen its stability in intervertebral.
Preferably, described projection is arranged at upper surface and the lower surface of described blocks.
Preferably, described blocks is comprised of cortical bone and spongy bone, in described cortical bone, is provided with chamber, and described spongy bone is placed in the chamber of described cortical bone and integrally combines.
Preferably, described chamber is the through hole being arranged in described cortical bone, and described spongy bone is cylindric, and described spongy bone is placed in chamber, by pressing or biogum bonding one.
Preferably, the length a of described blocks is 9～14mm, and width b is 9-12mm, and thickness c is 4-10mm.
Preferably, the upper surface of described blocks and lower surface angle α are 2-8 °.
Preferably, described projection can be pointed tooth.
Compared with prior art, the advantage the utlity model has is: (1) adopts animal bone is raw material, and after biochemical treatment, the compatibility is good, and elastic modelling quantity and people's bone approach; (2) cortical bone enough mechanical strength after providing and implanting, spongy bone promotes freshman bone tissue to grow into; (3) adopt upper and lower surface to be all designed with the structural design of pointed tooth:, to strengthen its stability in intervertebral, end face has 2～8 ° of inclination angles, reaches the vertebral fusion of best anatomical position; During concrete production, can adopt different height specifications, meet the clinical needs of different vertebral bodys.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view (wherein, 1 is cortical bone, and 2 is spongy bone, and 3 is projection, and c is thickness, and α is upper and lower surperficial angle) of this utility model biotype cervical vertebral fusion cage;
Fig. 2 is the plan structure schematic diagram (3 is projection, a length, b width for 1 cortical bone, 2 spongy bone) of this utility model biotype cervical vertebral fusion cage.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, a kind of biotype cervical vertebral fusion cage of this utility model is described in detail.
Biotype cervical vertebral fusion cage, as depicted in figs. 1 and 2, for meeting the blocks bone piece of the square and plate shape of cervical vertebra bone grafting requirement clinically, to maintain the physiological property of the lordosis of cervical vertebra.On described blocks surface, be provided with projection 3, to strengthen its stability in intervertebral.Preferably, described protruding 3 are arranged at upper surface and the lower surface of described blocks, and the upper surface of described blocks and lower surface angle α are 2-8 °.Preferred, the upper surface of described blocks and lower surface angle α are 4-7 °.Wherein, described blocks is comprised of cortical bone 1 and spongy bone 2, in described cortical bone 1, is provided with chamber, and described spongy bone 2 is placed in the chamber of described cortical bone 1 and integrally combines.Described chamber is the through hole being arranged in described cortical bone 1, and described spongy bone 2 is cylindric, and described spongy bone 1 is placed in chamber, by pressing or biogum bonding one.Described projection can be pointed tooth.The length a of described blocks is 9～14mm, and width b is 9-12mm, and thickness c is 4-10mm.Certainly, described blocks can arrange arbitrary size as required.
Above-described is only to preferred implementation method of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of this utility model know-why; can also make some improvement and replacement, these improvement and replacement also should be considered as protection domain of the present utility model.