CN203935261U - A kind of Via Posterior Spinal Approach dynamic fixation system - Google Patents
A kind of Via Posterior Spinal Approach dynamic fixation system Download PDFInfo
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- CN203935261U CN203935261U CN201420306131.8U CN201420306131U CN203935261U CN 203935261 U CN203935261 U CN 203935261U CN 201420306131 U CN201420306131 U CN 201420306131U CN 203935261 U CN203935261 U CN 203935261U
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- elastomer
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- cylindrical bump
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Abstract
A Via Posterior Spinal Approach dynamic fixation system, relates to the internal fixation device using in spinal operation.Be provided with 2 parallel pitmans, 2 parallel pitmans are respectively equipped with fixing elastomeric metal fixed block, between 2 fixing elastomeric metal fixed blocks, establish elastomer, the surface of fixing elastomeric metal fixed block is provided with connecting hole and the middle connecting hole of accepting a sections elastomer lower surface cylindrical bump that elastomer upper surface cylindrical bump is accepted in left and right, fixing elastomeric metal fixed block side is provided with the lock hole corresponding with the connecting hole of accepting a upper sections elastomer lower surface cylindrical bump with the connecting hole of accepting elastomer upper surface cylindrical bump, elastomeric upper and lower surface is provided with elastomer upper and lower surface metal interface and elastomer upper and lower surface cylindrical bump, establishes fixed lobe inside elasticity pitman antivibrator and the upper and lower metal interface of elastomer between elastomer upper and lower surface metal interface, at 2 pitman two ends, be provided with pedicle screw.
Description
Technical field
This utility model relates to the internal fixation device using in a kind of spinal operation, especially relates to a kind of Via Posterior Spinal Approach dynamic fixation system.
Background technology
Spinal column is the very important axial bone of human body, has and supports trunk, protection internal organs, protection spinal cord and the function of moving.It is comprised of several moving cells, and the intervertebral disc structure that each moving cell is connected with centre by adjacent vertebral bodies and rear department enclosure etc. forms.When there is the factor infringements such as wound, inflammation, tumor, degenerative change and osteopathia, motor unit just there will be inharmonic instability status, and pain and nerve function lesion appear in patient, have a strong impact on the body function of spinal column.Existing surgical intervention is usually by rigidity fusion (the Resnick DK to unsteady motion unit, Choudhri TF, Dailey AT, Groff MW, et al.Guidelines for the performance of fusion procedures for degenerative disease of the lumbar spine.Part12:pedicle screw fixation as an adjunct to posterolateral fusion for low-back pain.J Neurosurg Spine.2005Jun; 2 (6): 700-6.), cause between the moving cell of original mobility and occurred that permanent bone merges, and has lost normal physiological activity.Although this fusion can reach good curative effect in a short time, but the forfeiture of fixed-segment mobility causes the stress of this sections by the adjacent moving cell of being delivered to of compensatory, this can cause the regression acceleration of adjacent moving cell and occur new functional lesion (Bae JS, Lee SH, Kim JS, Jung B, Choi G.Adjacent segment degeneration after lumbar interbody fusion with percutaneous pedicle screw fixation for adult low-grade isthmic spondylolisthesis:minimum3years of follow-up.Neurosurgery.2010Dec, 67 (6): 1600-7).Simultaneously, along with the increase of activity, rigidly fix itself and also can cause the fatigue of metal immobilization material, thereby the fracture of metal immobilization material or loosening, particularly long segment occur fixedly time, the risk of this complication generation is higher.Therefore, merging is not fixedly a kind of desirable fixed form.
At present, in the dynamic fixed form of spinal column, some is attempted, and the main rigidity of passing through to change pitman, makes pitman have certain toughness, thereby reduced the fatigue fracture risk of metal, has certain mobility simultaneously.But this toughness, mobility and fixedly between desired stiffness, be difficult for very much reaching balance, as emphasized, pliability is fine, and moving cell mobility can exceed normal range, if improve fixedly rigidity, toughness and mobility can be too poor, and the time has been grown fixture fracture and loosening can occur.These changes are only also the physiological activity functions of echokinesis cell mesh.
For above situation, be desirable to provide and a kind ofly can imitate spinal motion unit's normal physiological activity, can correct again the spinal internal fixation system of motor unit instability status.
Summary of the invention
The purpose of this utility model is to provide the internal fixation device using in a kind of spinal operation, the spinal internal fixation system that is used for the treatment of spinal motion unit unstability, this fixed system allow fixed-segment spinal column have certain anteflexion, after stretch, lateroflexion, axially and the range of activity such as rotation, and the elastomer in system has enough sections rigidity and elasticity, both can limit or control the over-activity scope of fixed-segment, and can provide again axial load to bear a heavy burden and buffering.
This utility model is provided with 2 parallel pitmans, 2 parallel pitmans are respectively equipped with fixing elastomeric metal fixed block, between 2 fixing elastomeric metal fixed blocks, be provided with elastomer, the surface of fixing elastomeric metal fixed block is provided with connecting hole and the middle connecting hole of accepting a sections elastomer lower surface cylindrical bump that elastomer upper surface cylindrical bump is accepted in left and right, the side of fixing elastomeric metal fixed block is provided with the lock hole corresponding with the connecting hole of accepting a upper sections elastomer lower surface cylindrical bump with the connecting hole of accepting elastomer upper surface cylindrical bump,
Described elastomeric upper surface is provided with elastomer upper surface metal interface and elastomer upper surface cylindrical bump, elastomer and lower surface are provided with elastomer lower surface metal interface and elastomer lower surface cylindrical bump, are provided with fixed lobe inside elasticity pitman antivibrator and the upper and lower metal interface of elastomer between elastomer upper surface metal interface and elastomer lower surface metal interface; At the two ends of 2 parallel pitmans, be provided with 4 pedicle screws, this utility model is fixed on vertebral body by pedicle screw.
The middle part of described 2 parallel pitmans can be curved.
Described elastomer can adopt polycarbonate polyurethane.
Described elasticity pitman antivibrator can adopt superhigh intensity and the bar-shaped antivibrator of hyperelastic memorial alloy elasticity, and the bar-shaped antivibrator of described memorial alloy elasticity can adopt the bar-shaped antivibrator of titanium alloy elastic or the bar-shaped antivibrator of nickel alloy elasticity.
The nail body of described pedicle screw can be provided with external screw thread.
This utility model is laterally connected and fixed by parallel two pitmans and four pieces of pedicle screws, and the pedicle screw of each vertebral body bilateral and pitman connect into an integral body, have increased the fixing stability of internal fixation system.
The centre of spinal internal fixation system pitman is fixed block, and fixed block and pitman have a style of one's own, and fixed block can be fixed on elastomer in the middle of two pitmans.3, the surface connecting hole of fixed block, middle connecting hole is to accept an elastomeric lower surface, each connecting hole of both sides is to accept elastomeric upper surface.The side of fixed block is the fixing hole corresponding with fixed block surface connecting hole, by the connection of this fixing hole locking connecting hole.
Between the fixed block of two pitmans, be elastomer, by polycarbonate polyurethane materials processing, formed.Polycarbonate polyurethane material has good wearability, resistance to punching press, biocompatibility, processing characteristics, antioxygenic property, machinery and machinery/power performance etc.
The metal interface of elastomer and upper and lower surface is assembled into an integral body, and elastomeric height can regulate, thereby meets the internal fixation of spine requirement of different vertebral heights.Elastomer upper surface metal interface has 2 cylindrical protrusion, for the connection of upper connection rod fixed block; Elastomer lower surface metal interface has 1 cylindrical protrusion, for the connection of the next pitman fixed block.The inner surface of metal interface is respectively a fixing elastomeric coniform male member being connected with interface, for fixing and prevent elastomeric displacement.
In order to strengthen elastomeric resistance to punching press elasticity and stability, in elastomer both sides, respectively design a high strength and hyperelastic memorial alloy as the elasticity pitman antivibrator that is made such as titanium alloy or Nitinol.
In use, can simulate the physiological activity between normal vertebral body, can allow fixed-segment spinal column have certain anteflexion, after stretch, lateroflexion, axially and the range of activity such as rotation, and the elastomer in system has enough sections rigidity and elasticity, both can limit or control the over-activity scope of fixed-segment, and can provide again axial load to bear a heavy burden.This system can replace the accessory structure of vertebral body, for the operative treatment of the diseases such as the little joint disease of spinal column, spinal canal stenosis, discogenic disease and centrum olisthe, fixing between spinal vertebral in, retained the normal physiological activity of spinal column.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model embodiment.
Fig. 2 be this utility model embodiment with the metal bar of fixed block and fixing pedicle screw schematic diagram.
Fig. 3 is the elastomer schematic diagram of this utility model embodiment.
The specific embodiment
Referring to Fig. 1～3, this utility model is provided with 2 parallel pitmans 1, 2 parallel pitmans 1 are respectively equipped with fixing elastomeric metal fixed block 10, between 2 fixing elastomeric metal fixed blocks 10, be provided with elastomer 6, the surface of fixing elastomeric metal fixed block 10 is provided with connecting hole 2 and the middle connecting hole 3 of accepting a sections elastomer lower surface cylindrical bump that elastomer upper surface cylindrical bump is accepted in left and right, the side of fixing elastomeric metal fixed block 10 is provided with the lock hole 5 corresponding with the connecting hole 3 of accepting a upper sections elastomer lower surface cylindrical bump with the connecting hole 2 of accepting elastomer upper surface cylindrical bump,
The upper surface of described elastomer 6 is provided with elastomer upper surface metal interface 61 and elastomer upper surface cylindrical bump 62, elastomer 6 and lower surface are provided with elastomer lower surface metal interface 63 and elastomer lower surface cylindrical bump 64, are provided with fixed lobe 8 inside elasticity pitman antivibrator 7 and the upper and lower metal interface of elastomer between elastomer upper surface metal interface 61 and elastomer lower surface metal interface 63; At the two ends of 2 parallel pitmans 1, be provided with 4 pedicle screws 9, this utility model is fixed on vertebral body by pedicle screw 9.
The middle part of described 2 parallel pitmans 1 can be curved.
Described elastomer 6 can adopt polycarbonate polyurethane.
Described elasticity pitman antivibrator 7 can adopt superhigh intensity and the bar-shaped antivibrator of hyperelastic memorial alloy elasticity, and the bar-shaped antivibrator of described memorial alloy elasticity can adopt the bar-shaped antivibrator of titanium alloy elastic or the bar-shaped antivibrator of nickel alloy elasticity.
The nail body 91 of described pedicle screw 9 can be provided with external screw thread.
This utility model is laterally connected and fixed by parallel two pitmans and four pieces of pedicle screws, and the pedicle screw of each vertebral body bilateral and pitman connect into an integral body, have increased the fixing stability of internal fixation system.
The centre of spinal internal fixation system pitman is fixed block, and fixed block and pitman have a style of one's own, and fixed block can be fixed on elastomer in the middle of two pitmans.3, the surface connecting hole of fixed block, middle connecting hole is to accept an elastomeric lower surface, each connecting hole of both sides is to accept elastomeric upper surface.The side of fixed block is the fixing hole corresponding with fixed block surface connecting hole, by the connection of this fixing hole locking connecting hole.
Between the fixed block of two pitmans, be elastomer, by polycarbonate polyurethane materials processing, formed.Polycarbonate polyurethane material has good wearability, resistance to punching press, biocompatibility, processing characteristics, antioxygenic property, machinery and machinery/power performance etc.
The metal interface of elastomer and upper and lower surface is assembled into an integral body, and elastomeric height can regulate, thereby meets the internal fixation of spine requirement of different vertebral heights.Elastomer upper surface metal interface has 2 cylindrical protrusion, for the connection of upper connection rod fixed block; Elastomer lower surface metal interface has 1 cylindrical protrusion, for the connection of the next pitman fixed block.The inner surface of metal interface is respectively a fixing elastomeric coniform male member being connected with interface, for fixing and prevent elastomeric displacement.
Pedicle screw is made by pliability and the splendid titanium alloy material of intensity, and screw nail body has bone thread structure, and nail tail is U-shaped opening, is used for fixing the pitman with fixed block.
Pitman is the cylindric rod of the titanium alloy of Intermediate Gray arc, and arc design can maintain the form of canalis spinalis, avoids iatrogenic canalis spinalis narrow.
The centre of pitman is the fixture being connected with rod, and fixture is used for fixing the elastomer in the middle of 2 pitmans.The fixture being positioned at is above to be connected with elastomer upper surface metal cylinder projection by 2 connecting holes; The fixture being positioned at is below to be connected with elastomer lower surface metal cylinder projection by 1 connecting hole, and locks with screw by the lock hole of side.
Elastomer is high by hardness, intensity good, the polycarbonate polyurethane materials processing of high resiliency, high-wearing feature, tear-resistant, ageing-resistant, radiation hardness and good biocompatibility forms.It can realize spinal column fixed-segment have necessarily anteflexion, after stretch, lateroflexion, axially and the activity such as rotation, simulate the normal physiological activity of spinal column completely.
Elastomer can be designed to differing heights, to meet the fixedly vertebral body of differing heights.Therefore the metal interface of elastomer and upper and lower surface can be assembled into the integral body that can arbitrarily dismantle, by lock screw, is connected with the fixed block of pitman.
In order to keep elastomeric stability, each cone-shaped bulge of the inner side of upper and lower metal interface design, fixedly polycarbonate polyurethane elastomer, prevents skew.
In order to strengthen elastomeric resistance to punching press elasticity and stability, in elastomer both sides, respectively design a high strength and hyperelastic memorial alloy as the elasticity pitman antivibrator that is made such as titanium alloy or Nitinol.This antivibrator can prevent that elastomer range of activity from excessively causing elastomeric infringement, and plays the effect that adds strong stability fixed-segment.
Claims (4)
1. a Via Posterior Spinal Approach dynamic fixation system, it is characterized in that being provided with 2 parallel pitmans, 2 parallel pitmans are respectively equipped with fixing elastomeric metal fixed block, between 2 fixing elastomeric metal fixed blocks, be provided with elastomer, the surface of fixing elastomeric metal fixed block is provided with connecting hole and the middle connecting hole of accepting a sections elastomer lower surface cylindrical bump that elastomer upper surface cylindrical bump is accepted in left and right, the side of fixing elastomeric metal fixed block is provided with the lock hole corresponding with the connecting hole of accepting a upper sections elastomer lower surface cylindrical bump with the connecting hole of accepting elastomer upper surface cylindrical bump,
Described elastomeric upper surface is provided with elastomer upper surface metal interface and elastomer upper surface cylindrical bump, elastomer and lower surface are provided with elastomer lower surface metal interface and elastomer lower surface cylindrical bump, are provided with fixed lobe inside elasticity pitman antivibrator and the upper and lower metal interface of elastomer between elastomer upper surface metal interface and elastomer lower surface metal interface; At the two ends of 2 parallel pitmans, be provided with 4 pedicle screws.
2. a kind of Via Posterior Spinal Approach dynamic fixation system as claimed in claim 1, is characterized in that the middle part of described 2 parallel pitmans is curved.
3. a kind of Via Posterior Spinal Approach dynamic fixation system as claimed in claim 1, is characterized in that described elasticity pitman antivibrator adopts the bar-shaped antivibrator of memorial alloy elasticity.
4. a kind of Via Posterior Spinal Approach dynamic fixation system as claimed in claim 1, is characterized in that the nail body of described pedicle screw is provided with external screw thread.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420306131.8U CN203935261U (en) | 2014-06-10 | 2014-06-10 | A kind of Via Posterior Spinal Approach dynamic fixation system |
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| CN201420306131.8U CN203935261U (en) | 2014-06-10 | 2014-06-10 | A kind of Via Posterior Spinal Approach dynamic fixation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104000645A (en) * | 2014-06-10 | 2014-08-27 | 张衣北 | Dynamic fixing system of posterior spinal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104000645A (en) * | 2014-06-10 | 2014-08-27 | 张衣北 | Dynamic fixing system of posterior spinal |
| CN104000645B (en) * | 2014-06-10 | 2017-01-18 | 张衣北 | Dynamic fixing system of posterior spinal |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170808 Address after: 430000, B5-103, 666 hi tech Avenue, East Lake hi tech Zone, Hubei, Wuhan Patentee after: Optics Valley Wuhan North Korea Medical Instrument Co., Ltd. Address before: The Lake District of Xiamen City, Fujian province 361000 Wuyuan East three No. 2 room 1803 Patentee before: Zhang Yibei |
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| TR01 | Transfer of patent right |