CN210301308U - Adjustable self-stability lumbosacral segment artificial vertebral body - Google Patents
Adjustable self-stability lumbosacral segment artificial vertebral body Download PDFInfo
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- CN210301308U CN210301308U CN201920254001.7U CN201920254001U CN210301308U CN 210301308 U CN210301308 U CN 210301308U CN 201920254001 U CN201920254001 U CN 201920254001U CN 210301308 U CN210301308 U CN 210301308U
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Abstract
The utility model discloses an adjustable self-stability lumbosacral section artificial vertebral body, wherein an upper vertebral body part consists of a bottom plate, a side plate and an outer cylindrical shell; the lower vertebral body part consists of a trapezoidal base station, an antiskid plate and an inner cylindrical shell, and the contact surface of the lower vertebral body part and the upper end plate of the sacrum is provided with saw-toothed protrusions; the antiskid plate is positioned at the front lower part of the trapezoidal base station, and an included angle gradient is formed between the antiskid plate and the plane of the base station on which the sawtooth-shaped protrusions are arranged, so that the antiskid plate is tightly attached to the front surface of the sacrum, and the spinal cord compression caused by the backward movement of the prosthesis is prevented; the upper vertebral body component and the lower vertebral body component are connected through the mutual insertion of the outer cylindrical shell and the inner cylindrical shell, and a limiting device for preventing mutual rotation is arranged in the upper vertebral body component and the lower vertebral body component. The whole prosthesis has a hydroxyapatite coating at the contact part with the bone surface, and bone grafting fusion can be carried out in the cylindrical shell. The utility model discloses can replace L5 and adjacent intervertebral disc destruction that diseases such as tuberculosis, tumour arouse, rebuild the physiological curvature and the stability at operation position, not only convenient operation but also its height and angle are easily adjusted.
Description
Technical Field
The utility model relates to a medical prosthesis manufacturing technology in the medical technical field, in particular to an adjustable self-stable lumbosacral section artificial vertebral body.
Background
The lumbosacral segment is an important component of the human spine and plays an important physiological role in maintaining the pelvis shape, bearing the weight of the upper body, buffering the pressure of the spine and the like. The area is not only a moving segment of the front curve of the lumbar vertebra and the back curve of the sacrum, but also a joint part of the lumbar vertebra with a larger motion range and the sacrum without motion function basically. The unique anatomical morphology and the biomechanical environment result in the part being a high incidence area of diseases such as intervertebral disc protrusion, vertebral body slippage, scoliosis, infection and the like. Such conditions often result in destruction of the intervertebral disc or vertebral body, resulting in impaired physiological curvature and stability of the lumbosacral segment spine. The damage of the physiological curvature and stability of the spine can lead to unbalanced stress of local tissue structures to a certain extent, so that the transmission of internal force of the lumbosacral segment is unbalanced, adverse reactions such as muscle strain, pain, weakness and the like are caused, complications such as spinal compression, spinal deformity, lower limb paralysis and the like can be caused after a long time, and the life quality of patients is seriously reduced. The reconstruction of the physiological curvature and stability of the lumbosacral segment spine is the key to the treatment of the disease in the part.
The traditional anterior approach operation has the advantages of capability of removing focus under direct vision, and has the disadvantages that ① aorta, veins and important organs are all nearby, the way risk of an operator is high, ② lacks a proper internal fixation method of the part, not only can stably fix the focus after removing the focus, but also can reduce vascular complications, and a single posterior approach obtains a satisfactory curative effect when treating lumbosacral middle and posterior column lesions.
At present, the anatomical titanium plate of the lumbosacral vertebra, the steel plate fixation of the ilium bone grafting, the fixation of the ilium bone grafting side single nail rod or double-nail single rod system, the fixation of the bone grafting combined rear nail rod and the like are mainly fixed in the anterior operation within the scope of investigation. The lumbar sacral anterior self-locking titanium plate fixation is applied in the middle of construction, and the fixation method is considered to reduce the fused segment and provide reliable fixation. However, such methods have limited fixation strength, insufficient adjustability and flexibility of the fixture (such as screw orientation, plate length, and interbody compression), and are difficult to use for patients with severe L5 vertebral destruction. Yanyin and the like successfully treat 30 cases of patients with lumbosacral tuberculosis and obtain better clinical curative effect through first-stage anterior titanium cage bone grafting fusion and lateral anterior double nail rod system fixation, but complications such as titanium cage sinking and the like also exist. The report about the self-stability artificial vertebral body suitable for the L5 vertebral body and the adjacent intervertebral disc damage is not found in the related documents at home and abroad, and the utility model belongs to the first example in the design of the lumbosacral segment prosthesis.
Disclosure of Invention
The utility model relates to a self stabilization lumbosacral section artificial vertebral body with adjustable, it has overcome the shortcoming of current artificial vertebral body, fully consider operation approach and clinical operation, it is through setting up the upper and lower centrum of mutually supporting, improve screw and screw cooperation mode on the artificial vertebral body, set up on the centrum and realize with operation modes such as the corresponding angle of human skeleton, make neotype centrum not only height, the angle is easily adjusted, and the realization that can be better is operated the position physiology curvature and the reestablishment of stability moreover.
The utility model discloses realize above-mentioned purpose and adopt following technical scheme:
an adjustable self-stable lumbosacral segment artificial vertebral body comprises an upper vertebral body component and a lower vertebral body component.
The upper vertebral body component comprises a bottom plate, a side plate and an outer cylindrical shell, the outer cylindrical shell is connected to the lower part of the bottom plate, and the side surface of the bottom plate is provided with the side plate; the lower cone part comprises a trapezoidal base station, an anti-skid plate and an inner cylindrical shell, the inner cylindrical shell is connected to the upper part of the trapezoidal base station, and the anti-skid plate is arranged on the side surface of the bottom of the trapezoidal base station; the upper vertebral body component and the lower vertebral body component are connected in a manner of mutually inserting and connecting the outer cylindrical shell and the inner cylindrical shell; the upper vertebral body component and the lower vertebral body component are respectively provided with a screw connected to human bones.
The bottom plate and the side plate of the upper vertebral body component and the trapezoidal base station of the lower vertebral body component are respectively provided with a screw hole, and the screw is arranged in the screw hole; the screw hole is designed as a counter bore, and the diameter of the screw hole is slightly larger than that of the screw body.
The top of the bottom plate is provided with an upward protruding dome, and the upper part of the bottom plate is also provided with evenly distributed tooth protrusions; the odontoid process is triangular pyramid or cone, and the height of the odontoid process is 1 mm.
The ground of the trapezoid base station is an inclined plane, and the inclined plane is provided with saw-toothed protrusions; the inclined surface of the trapezoid base station with the sawtooth-shaped protrusions is corresponding to the upper end plate of the sacrum.
The height of the outer cylindrical shell is the same as that of the inner cylindrical shell, and rhombic hollow holes are formed in the side walls of the outer cylindrical shell and the inner cylindrical shell.
The inner cylindrical shell is provided with a longitudinal notch groove, the inner wall of the outer cylindrical shell is provided with a longitudinal bolt, the longitudinal bolt is buckled into the notch groove on the inner cylindrical shell, and the relative rotation of the outer cylindrical shell and the inner cylindrical shell in the axial direction is limited through the matching of the longitudinal bolt and the notch groove.
The bottom plate of the upper vertebral body is provided with two inclined screw holes which are parallel to each other; the side plates are integrally triangular, the side plates and the bottom plate form an included angle of about 80 degrees, and screw holes parallel to the bottom plate are formed in the centers of the side plates; a screw is arranged in the screw hole; the front and the side of the trapezoid base station are respectively provided with a screw hole, and a screw is arranged in the screw hole.
The antiskid plate is positioned at the front lower part of the trapezoid base station, and the included angle between the antiskid plate and the inclined plane on the trapezoid base station is 135 +/-5 degrees and is the same as the lumbosacral angle.
And two clamping holes corresponding to each other are formed in the side surface of the outer cylindrical shell.
And the positions where the outer cylindrical shell and the bottom plate are connected and the inner cylindrical shell and the trapezoid base station are provided with arc-shaped fillet reinforcing parts.
The upper vertebral body component and the lower vertebral body component are made of medical titanium alloy materials or polyether-ether-ketone materials.
The contact surfaces of the upper vertebral body component and the lower vertebral body component with the surrounding bone are all provided with hydroxyapatite coatings, and the parts close to soft tissues such as blood vessels and the like are all subjected to smoothing treatment.
The utility model adopts the above technical scheme following beneficial effect has:
height, angularly adjustable self stability lumbosacral section artificial vertebral body, fully considered the anatomical features of human lumbosacral section backbone, end plate and centrum side combine closely under bottom plate and curb plate and the L4 centrum of going up centrum part, the trapezoidal base station and the antiskid ribbed tile of lower centrum part respectively with S1 centrum on end plate and preceding combine closely to effectively reduced the stress concentration of contact surface, satisfied the bearing function of normal waist lumbosacral section backbone.
Go up the outer cylinder shell of centrum part and the interior cylinder shell highly uniform of centrum part down, all be equipped with high gradient, according to CT scan data, measure the interior outer cylinder shell of L5 centrum and neighbouring intervertebral disc height selection suitable size before the art and assemble to different patients' demand has been satisfied.
The utility model discloses the plane and the antiskid ribbed tile of end plate contact on trapezoidal base station and the sacrum all are equipped with angle gradient, according to patient's lumbosacral section CT and three-dimensional reconstruction before the art, measure the contained angle of end plate and horizontal plane on lumbosacral angle and the sacrum, select trapezoidal base station and the antiskid ribbed tile of suitable angle, can satisfy different patients' demand.
The utility model discloses the screw all sets up in false body side, the place ahead, fully considers lumbosacral section spinal surgery side the place ahead operation flow of going into way, makes the operation easier.
The utility model discloses the calotte on the upper vertebral body part bottom plate is identical with the central back sunken department of lumbar vertebra end plate, and calotte upper portion is equipped with the cusp with the periphery and swells, makes the bottom plate combine inseparabler, firm with the end plate. The side plate is tightly attached to the side face of the L4 vertebral body, so that stress concentration is effectively avoided. The bottom plate and the outer cylinder shell junction and trapezoidal base station and interior cylinder shell junction all are equipped with fillet reinforcing portion, avoid the emergence of adverse events such as rupture.
The cylinder shell side all be equipped with rhombus fretwork hole, do benefit to the adhering to of tissue on every side and the surplus sclerotin of going into of growing into, wherein the hollow structure can hold more implantation bone to more do benefit to and organize on every side's integration, guaranteed the long-term stability of postoperative. In addition, the side surface of the outer cylindrical shell is provided with two clamping holes, which is beneficial for an operator to clamp the prosthesis and is convenient for operation.
The screw be the countersunk head screw, the embedding of afterbody after the screw of being convenient for is implanted avoids the friction to tissue on every side. In addition, the diameter of the screw hole is slightly larger than that of the screw body, so that a certain adjusting angle is provided for the screw during implantation, and the implantation of a nail is facilitated.
The contact part of the prosthesis and the bone surface is provided with the hydroxyapatite coating, which is more beneficial to the fusion with the surrounding tissues and ensures the stability.
Drawings
FIG. 1 is a front view of the present invention
Fig. 2 is a rear view of the present invention
FIG. 3 is a side view of the present invention
FIG. 4 is a top view of the present invention
Fig. 5 is a bottom view of the present invention
FIG. 6 is a cross-sectional view of the coronal plane of the present invention
FIG. 7 is an exploded view of the present invention
FIG. 8 is an isometric view of a superior vertebral body component
FIG. 9 is an isometric view of an inferior vertebral body component
FIG. 10 is a schematic diagram of the angle α of the trapezoid base and the height H2 of the inner cylindrical shell
FIG. 11 is a schematic diagram of the parameters of the cleat angle β and the inner cylindrical shell height H2
FIG. 12 is a parameter diagram of the angle γ between the side plate and the bottom plate and the height H1 of the outer cylindrical shell
FIG. 13 is a schematic representation of the novel prosthesis after implantation in the spinal column
In the figure, 1 is a bottom plate, 2 is a side plate, 3 is an outer cylindrical shell, 4 is a trapezoidal base station, 5 is an antiskid plate, 6 is an inner cylindrical shell, 7 is a rhombic hollow hole, 8 is a fillet reinforcing part, 9 is a longitudinal bolt, 10 is a notch groove, 11 is a clamping hole, 12 is a screw hole, 13 is a serration, 14 is a dome, 15 is a serration, and 16 is a screw.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1-7, the artificial vertebral body of the present invention comprises an upper vertebral body part, a lower vertebral body part and screws, wherein the upper vertebral body part comprises a bottom plate 1, a side plate 2 and an outer cylindrical shell 3, the lower vertebral body part comprises a trapezoidal base platform 4, an anti-skid plate 5 and an inner cylindrical shell 6, and the plane of the contact between the trapezoidal base platform 4 and the upper end plate of the sacrum and the anti-skid plate 5 are both provided with an angle gradient (α, β), thereby realizing the angle adjustment.
Referring to fig. 8-12, the outer cylindrical shell 3 and the inner cylindrical shell 4 have the same height (H1 ═ H2), and are provided with height gradients (height range: 40mm-60mm, gradient: 2mm), and rhombic hollow holes 7 on the side surfaces, the joints of the outer cylindrical shell 3 and the bottom plate 1 and the joints of the inner cylindrical shell 6 and the trapezoidal abutment 4 are provided with fillet reinforced parts 8 to make the prosthesis more firm, the side surfaces of the outer cylindrical shell 3 are provided with longitudinal bolts 9 which are matched with the notch grooves 10 on the inner cylindrical shell 6 to prevent the prosthesis from rotating axially, and for the prosthesis implantation, the side surfaces of the outer cylindrical shell are provided with two clamping holes 11, the trapezoidal abutment 4 is provided with screw holes 12 on the front surface and the side surfaces, and the plane contacting with the sacrum upper end plate is provided with jagged protrusions 13 to prevent the prosthesis from moving forward, and the plane is provided with an angle gradient α to make the plane completely parallel to the sacrum upper end plate.
The anti-slip plate 5 is arranged at the front lower part of the trapezoidal base platform 4, an included angle β formed by the anti-slip plate and a sawtooth surface on the base platform is 135 +/-5 degrees and is the same as a lumbosacral angle, in order to adapt to different lumbosacral angles, an angle gradient of 1 degree is arranged, the bottom plate 1 is provided with a dome 14, an odontoid process 15 and two parallel screw holes 12, the dome 14 is matched with the depression of a vertebral body lower end plate of the L4, the local stress is reduced, the prosthesis is prevented from sinking, the odontoid process 15 is in a triangular pyramid shape or a conical shape, the plane which is arranged on the bottom plate 1 and is contacted with the L4 lower end plate is 1mm high, the fixing strength of the prosthesis and an adjacent vertebral end plate is improved, the side plate 2 is integrally triangular, an included angle gamma of about 80 degrees is formed between the side plate and the floor, and the countersunk head screw hole 12 parallel to the bottom plate is arranged in the center.
The upper vertebral body part, the lower vertebral body part and the screw are integrally formed. The vertebral body component is made of medical titanium alloy materials or polyether-ether-ketone materials. The contact surfaces of the upper vertebral body part and the lower vertebral body part with the surrounding sclerotin are respectively provided with a hydroxyapatite coating, and the parts close to soft tissues such as blood vessels and the like are respectively subjected to smoothing treatment.
Examples
Referring to fig. 1-12, a height, angle adjustable, self-stabilizing lumbosacral segment artificial vertebral body includes a superior vertebral body component, an inferior vertebral body component, and a screw. The upper vertebral body part consists of a bottom plate, a side plate and an outer cylindrical shell; the lower vertebral body component consists of a trapezoidal base station, an anti-skid plate and an inner cylindrical shell, and the plane of the trapezoidal base station contacting with the upper end plate of the sacrum and the anti-skid plate are both provided with angle gradients, so that the angle adjustment is realized. The outer cylindrical shell and the inner cylindrical shell are consistent in height and are provided with height gradients, so that the height of the prosthesis is convenient to adjust. The joint of the outer cylindrical shell and the bottom plate and the joint of the inner cylindrical shell and the trapezoid base station are provided with fillet reinforcing parts, so that the prosthesis is firmer. The side of the outer cylindrical shell is provided with longitudinal bolts which are matched with the notch grooves on the inner cylindrical shell, thereby preventing the axial rotation of the prosthesis. For the convenience of prosthesis implantation, the side surface of the outer cylindrical shell is provided with two clamping holes. The front and the side of the trapezoid abutment are provided with screw holes, the plane of the trapezoid abutment contacting with the upper end plate of the sacrum is provided with saw-toothed protrusions to prevent the prosthesis from moving forwards, and the plane is provided with an angle gradient to enable the plane to be completely parallel to the upper end plate of the sacrum. All parts of the prosthesis are made of medical titanium alloy materials or polyether-ether-ketone materials. The novel prosthesis and the bone surface contact part such as the upper surface of the bottom plate, the inner surface of the side plate, the side surface of the vertebral body and the like are all provided with hydroxyapatite coatings of about 20 mu m.
Referring to fig. 13, the adjustable self-stable lumbosacral artificial vertebral body of the present invention has the following assembling relationship: before operation, relevant anatomical parameters such as a lumbosacral angle and the like are collected according to CT scanning and three-dimensional reconstruction of a lumbosacral section of a patient, and upper and lower vertebral body components with proper models are selected according to the size of a focus. The gap groove of the lower vertebral body component corresponds to the longitudinal bolt of the upper vertebral body component, then the inner cylindrical shell is inserted into the outer cylindrical shell, then cancellous bone is filled from the circular gap on the bottom plate of the upper vertebral body component, finally the assembled prosthesis is implanted into a focus, and then a proper screw is selected for fixing. The dome on the bottom plate is matched with the depression of the lower end plate of the L4 vertebral body, the conical tooth process enables the bottom plate to be combined with the end plate more firmly, the contact area of the side plate and the adjacent vertebral body is increased, the stress concentration is effectively reduced, and therefore the bearing function of the lumbosacral section is met. The side face of the vertebral body component is provided with the rhombic hollow holes, so that the attachment and growth of surrounding tissues are facilitated, and the long-term stability after the operation is ensured.
In a word, the adjustable self-stability lumbosacral segment artificial vertebral body comprises an upper vertebral body component, a lower vertebral body component and a screw. The upper vertebral body component consists of a bottom plate, a side plate and an outer cylindrical shell. The bottom plate is provided with a dome, a tooth projection and two parallel screw holes, the side plate is provided with a screw hole, the outer cylindrical shell is provided with a height gradient, and the side surface of the outer cylindrical shell is provided with a diamond hollow hole, a longitudinal bolt and a clamping hole. The lower vertebral body part consists of a trapezoidal base, an antiskid plate and an inner cylindrical shell. One screw hole is respectively arranged at the side and the front of the trapezoid abutment, and the contact surface of the trapezoid abutment and the upper end plate of the sacrum is provided with saw-toothed protrusions; the antiskid plate is positioned at the front lower part of the trapezoidal base station, and an included angle gradient is formed between the antiskid plate and the plane of the base station on which the sawtooth-shaped protrusions are arranged, so that the antiskid plate is tightly attached to the front surface of the sacrum, and the spinal cord compression caused by the backward movement of the prosthesis is prevented; the inner cylindrical shell has the same height as the cylindrical shell and the same height gradient, the side surface of the inner cylindrical shell is provided with a rhombic hollow hole and a notch groove, and the notch is combined with the longitudinal bolt on the outer cylindrical shell, so that the combined prosthesis is placed to rotate axially. The whole prosthesis has a hydroxyapatite coating at the contact part with the bone surface, and bone grafting fusion can be carried out in the cylindrical shell. The utility model discloses can replace L5 and adjacent intervertebral disc destruction that diseases such as tuberculosis, tumour arouse, rebuild the physiological curvature and the stability at operation position, not only convenient operation but also its height and angle are easily adjusted.
Claims (10)
1. The utility model provides a self stabilization lumbosacral section artificial vertebral body with adjustable, it includes the superior vertebra body part and inferior vertebra body part, its characterized in that: the upper vertebral body component comprises a bottom plate, a side plate and an outer cylindrical shell, the outer cylindrical shell is connected to the lower part of the bottom plate, and the side surface of the bottom plate is provided with the side plate; the lower cone part comprises a trapezoidal base station, an anti-skid plate and an inner cylindrical shell, the inner cylindrical shell is connected to the upper part of the trapezoidal base station, and the anti-skid plate is arranged on the side surface of the bottom of the trapezoidal base station; the upper vertebral body component and the lower vertebral body component are connected in a manner of mutually inserting and connecting the outer cylindrical shell and the inner cylindrical shell; the upper vertebral body component and the lower vertebral body component are respectively provided with a screw connected to human bones.
2. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 1, wherein: the bottom plate and the side plate of the upper vertebral body component and the trapezoidal base station of the lower vertebral body component are respectively provided with a screw hole, and the screw is arranged in the screw hole; the screw hole is designed as a counter bore, and the diameter of the screw hole is slightly larger than that of the screw body.
3. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 2, wherein: the top of the bottom plate is provided with an upward protruding dome, and the upper part of the bottom plate is also provided with evenly distributed tooth protrusions; the odontoid process is triangular pyramid or cone, and the height of the odontoid process is 1 mm.
4. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 3, wherein: the ground of the trapezoid base station is an inclined plane, and the inclined plane is provided with saw-toothed protrusions; the inclined surface of the trapezoid base station with the sawtooth-shaped protrusions is corresponding to the upper end plate of the sacrum.
5. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 4, wherein: the height of the outer cylindrical shell is the same as that of the inner cylindrical shell, and rhombic hollow holes are formed in the side walls of the outer cylindrical shell and the inner cylindrical shell.
6. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 5, wherein: the inner cylindrical shell is provided with a longitudinal notch groove, the inner wall of the outer cylindrical shell is provided with a longitudinal bolt, the longitudinal bolt is buckled into the notch groove on the inner cylindrical shell, and the relative rotation of the outer cylindrical shell and the inner cylindrical shell in the axial direction is limited through the matching of the longitudinal bolt and the notch groove.
7. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 6, wherein: the bottom plate of the upper vertebral body is provided with two inclined screw holes which are parallel to each other; the side plates are integrally triangular, the side plates and the bottom plate form an included angle of about 80 degrees, and screw holes parallel to the bottom plate are formed in the centers of the side plates; a screw is arranged in the screw hole; the front and the side of the trapezoid base station are respectively provided with a screw hole, and a screw is arranged in the screw hole.
8. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 7, wherein: the antiskid plate is positioned at the front lower part of the trapezoid base station, and the included angle between the antiskid plate and the inclined plane on the trapezoid base station is 135 +/-5 degrees and is the same as the lumbosacral angle.
9. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 8, wherein: the side surface of the outer cylindrical shell is provided with two clamping holes which correspond to each other; and the positions where the outer cylindrical shell and the bottom plate are connected and the inner cylindrical shell and the trapezoid base station are provided with arc-shaped fillet reinforcing parts.
10. The adjustable self-stabilizing lumbosacral segment artificial vertebral body of claim 9, wherein: the upper vertebral body part and the lower vertebral body part are made of medical titanium alloy materials or polyether-ether-ketone materials; the contact surfaces of the upper vertebral body component and the lower vertebral body component with the surrounding bone are all provided with hydroxyapatite coatings, and the parts close to soft tissues such as blood vessels and the like are all subjected to smoothing treatment.
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| CN201920254001.7U CN210301308U (en) | 2019-02-28 | 2019-02-28 | Adjustable self-stability lumbosacral segment artificial vertebral body |
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| CN201920254001.7U CN210301308U (en) | 2019-02-28 | 2019-02-28 | Adjustable self-stability lumbosacral segment artificial vertebral body |
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| CN210301308U true CN210301308U (en) | 2020-04-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109758273A (en) * | 2019-02-28 | 2019-05-17 | 河南省人民医院 | A kind of adjustable autostability lumbosacral segment artificial vertebral body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109758273A (en) * | 2019-02-28 | 2019-05-17 | 河南省人民医院 | A kind of adjustable autostability lumbosacral segment artificial vertebral body |
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