CN201185960Y - Medical vertebral pedicle screw nail mechanism - Google Patents
Medical vertebral pedicle screw nail mechanism Download PDFInfo
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- CN201185960Y CN201185960Y CNU2008200936469U CN200820093646U CN201185960Y CN 201185960 Y CN201185960 Y CN 201185960Y CN U2008200936469 U CNU2008200936469 U CN U2008200936469U CN 200820093646 U CN200820093646 U CN 200820093646U CN 201185960 Y CN201185960 Y CN 201185960Y
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Abstract
The utility model relates to an internal implanted medical pedicle screw structure in surgery, which comprises a screw head, wherein a connecting bar is embedded into a U-groove which is radially and concavely arranged on the upper end of the screw head, a tapping screw is sleeved in an axial through hole on a circle center position of the lower end of the screw head, a gland liner is embedded on the upper portion of the connecting bar in the U-groove of the screw head, a gland is embedded into the U-groove of the screw head on the upper end of the gland liner, and a clamp spring is sleeved between the screw head and a screw. The gland can radially form the oblique self-locking with the inner walls of the screw head when rotates a certain degrees in the screw head U-groove, and the gland liner on the bottom of the gland is pushed downwards to fasten the connecting bar on the lower portion as the downward rotation of the gland, thereby limiting the horizontal movement of the connecting bar.
Description
Technical field
This utility model relates to the medical vertebral arch pedicle screw mechanism that a kind of surgery is implanted into.
Background technology
The therapeutic purposes of lumbar spondylolisthesis are to recover the lumbar vertebra normal alignment, the stability of removing nerve compression and rebuilding spinal column.If the keeping of its stability mainly realized by spinal fusion.Two more than ten years of past, development along with biomechanics, the orthopedic fixture that with pedicle screw and Invasive lumbar fusion device is feature has obtained development rapidly in operation is used, lumbar vertebral posterior intervertebral fusion art (PL IF) becomes the effective method commonly used of treatment lumbar spondylolisthesis.Wherein, pedicle screw is proved clearly in the fixed value aspect the enhancing lumbar vertebra engaging process.
At present, pedicle screw of using in the clinical operation and connecting rod device have a variety of, and the how tame medical apparatus corporation, Ltd in the world all releases product separately.Because pedicle screw and connecting rod device use the particularity and the limitation in field, the profile structure of each company's product is roughly the same, be that each pedicle screw (pedicle screw) all has the head of screw (polyaxial head) that holds connecting rod (connecting rod) a position, after pedicle screw and connecting rod are in place in operation, the end of screw is fixed in the head of screw by jig, the locking device of head of screw compresses connecting rod downwards, make pedicle screw, relative motion no longer takes place between head of screw and the connecting rod, become firm one, to strengthen the bonded stationarity of lumbar vertebra.Sum up and biomechanics experiment research by clinical case, the head of screw of having found pedicle screw is the key point that whole device connects and locks, and also is the link of most fragile, the easiest generation unstability in the whole device.Therefore, the head of screw structural design that is locked is the key of whole device design.
At present, the head of screw design of different company's product has their own characteristics each, in the function aspects that realizes locking and fixed connecting rod, fixed connecting rod is locked and pressed down to the main screw thread rotation that relies on, see also shown in Figure 1, in the nut rotational lock press mechanism, screw 6, open card ring set 8 and head of screw 4 assembling in advance, after screw 6 is shot the pedicle of vertebral arch of vertebrae, again connecting rod 3 is packed in the groove of head of screw 4, descending by rotation metric system nut 7 topmost, the connecting rod 3 that promotes in the head of screw 4 presses down, and it is descending to promote open card ring set 8, block the sphere top of screw 6 fully up to open card ring set 8,4 of screw 6 and head of screws are closely fixing, and the universal Rotation Design when screw 6 is shot pedicle of vertebral arch lost efficacy, and with head of screw 4 relative motion took place no longer.At this moment, connecting rod 3 belows are adjacent to the bottom surface, continue to tighten metric system nut 7, make it compress connecting rod 3 from the top, and rely on the frictional force of upper and lower, connecting rod 3 can not be moved along its axis direction occurred level, thereby head of screw 4, screw 6 and 3 of connecting rods are fixedly secured, avoid relative motion, strengthen stationarity and stability that vertebra engages.
Locking design by above-mentioned common pedicle screw head can effectively lock and connect bar in clinical operation, and compact conformation, and operation is also comparatively convenient.But in secular clinical use, find still to have significant disadvantages in the design of this type of screw-threaded coupling and fixed connecting rod, mainly as follows:
1, for making the more firm connecting rod that compresses the below of nut topmost, in clinical manipulation, need the limit to twist usually, to guarantee the nut check compacting.The locking nut of exertin damages structure member probably, and the screw thread permanent deformation of exertin rotation generation, makes device be difficult to dismounting and repeated use.
2, nut has been born the dual-use function of locking and fixed connecting rod.Because pedicle screw and connecting rod overall structure are very exquisite, fine thread is all adopted in nut and the connection of head of screw inwall, and pitch is little, and different angle is little, and self-locking property is better.But fine thread is not wear-resistant, and is yielding when bearing strong external force.Behind this device implant into body, because the physiological movement of human body lumbar vertebra nature, the threaded portion of pedicle screw head bears external force for a long time, be easy to develop into plastic deformation from the strain at initial stage, be difficult to closely fixing below connecting rod, connecting rod is prone to loosening in head of screw, finally causes the whole unstability of device.
3, after nut is locked connecting rod from the top, its active force can limit connecting rod along the moving both vertically of head of screw axis direction, and connecting rod is along the main frictionally restriction of horizontal movement of self axis direction.Contact line contact often even some contact and go up between square nut and connecting rod, the frictional force that can produce is very limited, and connecting rod is subjected to the external force generation to move the fixture inefficacy along the own level direction easily when human motion.
The utility model content
The purpose of this utility model is to overcome above-mentioned weak point of the prior art, and a kind of have certain rigidity and flexibility are provided, and is convenient to pedicle screw precession in the operation, the direction of scalable pedicle screw precession simultaneously; After pedicle screw puts in place, the connecting rod head is put into the U groove of pedicle screw head, the gland half-twist that gland cylinder both sides is had the inclined-plane boss, the inclined-plane boss is embedded in the inclined plane groove of head of screw inwall correspondence fully, boss surface and groove surfaces closely paste and, rely on pressure and frictional force between the inclined-plane to realize self-locking and fixing below connecting rod, to guarantee that relative motion no longer takes place between head of screw, screw and connecting rod, become firm one, strengthen bonded stationarity between vertebra; When being necessary to withdraw from connecting rod and pedicle screw, said structure can fast be opened self-locking, does not destroy provision for disengagement, is beneficial to device and reuses.Adopt auto-lock function and the new method that is fixed functional separation design simultaneously, with the inclined-plane self-locking mechanism be fixed mechanism design and be pedicle screw mechanism independently up and down.
The purpose of this utility model can reach by following measure:
This medical vertebral arch pedicle screw mechanism, comprise head of screw, this head of screw upper end radially is arranged with the U groove and is nested with a connecting rod, a sheathed tapping screw in this position, the center of circle, head of screw lower end axially extending bore, its special character is: the top that is positioned at connecting rod in the described head of screw U groove is embedded a gland liner, be embedded a gland, a sheathed jump ring between head of screw and screw in the head of screw U groove of this gland liner upper end; When gland during at head of screw U groove internal rotation certain angle, form the inclined-plane self-locking with head of screw inwall radial groove, and descending with the rotation of this gland, the gland liner that promotes its bottom is downwards with the connecting rod of fastening its below, the horizontal movement of restriction connecting rod.
The purpose of this utility model can also reach by following measure:
Described gland is arranged with by a cylinder, its position, the center of circle, top to be convenient to operating theater instruments and to insert the both sides of the hole, angle be rotated, this cylinder outer wall below and be respectively equipped with and be the cylindrical pin that same plane and integrated inclined-plane boss, this position, the center of circle, cylinder baseplane be convexly equipped with downwards with this cylinder bottom and form.
The upper surface of inclined-plane, described cylinder both sides boss is the inclined-plane, and two inclined-plane boss are antisymmetry and distribute.
The lower end, inclined-plane of inclined-plane, described cylinder both sides boss cuts the bigger chamfering in a fritter angle of inclination respectively, makes gland in put procedure, the easier inclined plane groove that enters the head of screw inwall.
The angle of inclination, inclined-plane of described inclined-plane boss is preferably 3 °～6 °.
Described head of screw radially is arranged with inclined plane groove, position, the cylinder center of circle that two cylinder inwalls upper end corresponding position that nested perforation groove, the groove of voltage supply lid inclined-plane boss separate is arranged with respectively by a cylinder, its top and is axially arranged with the vertical through hole that passes through mutually of groove and forms.
Described gland liner is by the lining body of a cuboid, the upper surface of its rectangular planes, and this upper surface center is offered voltage supply lid bottom and is convexly equipped with the nested open-work of cylindrical pin, and the arc surface that this lining body lower surface cuts into is formed.
The diameter that is convexly equipped with cylindrical pin bottom the described gland is slightly less than the diameter of gland liner upper surface open-work, after the cylindrical pin of gland inserts the open-work of gland liner, it is consistent that gland and the axis of gland liner remain, and gland is not subjected to the localized restriction of its below gland liner, free to rotate.
The radius size of the arc surface of described gland liner lower surface is slightly greater than the radius size of connecting rod, makes the arc surface of gland liner lower end can compress the connecting rod of its below with the face way of contact.
The through hole that position, the described head of screw cylinder center of circle is axially arranged with by the horn mouth of cylinder bottom, its upper end one section straight hole, straight hole upper end be arranged with the one section through hole that is contraction-like taper hole and passes through and be extended down to the cylinder upper surface with inclined plane groove mutually for the nested groove of jump ring, this groove top with the diameter upwards dispersing bellmouth orifice and connect greater than endoporus, this endoporus upper end edge cylinder inwall of straight hole and form.
The utlity model has following advantage:
1, this utility model adopts the inclined-plane self-locking mechanism, only needs both sides are had the gland half-twist of inclined-plane boss, and the inclined-plane boss is embedded in the inclined plane groove of head of screw inwall correspondence fully.When being necessary provision for disengagement, the gland reverse rotation being withdrawed from inclined plane groove for 90 ° get final product.Easy and simple to handle, self-locking is reliable, no deformation failure, and dismounting is reused easily.
2, usually in the design nut (or screw rod) born the dual-use function of locking and fixed connecting rod.This utility model adopts auto-lock function and the new method that is fixed the functional separation design, with the inclined-plane self-locking mechanism be fixed mechanism design for up and down independently.Self-locking is more firm, is fixed mechanism and can plastic deformation occurs hardly and lost efficacy.
3, realize in this utility model that the gland liner lower end that is fixed function cuts into arc surface, the radius size of arc surface is slightly greater than the radius size of connecting rod, make the arc surface of gland liner lower end can compress the connecting rod of below, can produce the horizontal movement that enough frictional force limits connecting rod with the face way of contact.
Description of drawings
Fig. 1 is the exploded view of existing common pedicle screw device.
Fig. 2 is the installation diagram of this utility model pedicle screw device.
Fig. 3 is the exploded view of this utility model pedicle screw device.
Fig. 4 is the cross section view of the head of screw of this utility model pedicle screw.
Fig. 5 is that the A-A of Fig. 4 is to cross section view.
Fig. 6 is the structural representation of this utility model pedicle screw gland.
Fig. 7 is the axonometric chart of the gland upper surface structure of this utility model pedicle screw.
Fig. 8 is the axonometric chart of the gland lower surface structure of this utility model pedicle screw.
Fig. 9 is the structural perspective of the gland liner of this utility model pedicle screw.
Figure 10 is the side view of the gland liner of this utility model pedicle screw.
Figure 11 is the bolt structure axonometric chart of this utility model pedicle screw.
Figure 12 is the left view of Figure 11.
The specific embodiment
This utility model is described in further detail below in conjunction with accompanying drawing:
Seeing also Fig. 2～shown in Figure 12, is the embodiment that this utility model is applied to the fixed pedicle screw of lumbar vertebral posterior.
A kind of pedicle screw comprises tapping screw 6 and head of screw 4, and head of screw 4 has the U type groove 41 that connecting rod 3 is installed.Described inclined-plane self-locking mechanism is the gland 1 that has inclined-plane boss 11, and the inclined plane groove 42 suitable with head of screw 4 inwall sizes cooperates realization.Gland 1 center is a cylinder, and hexagon ring 13 is opened in the cylinder top, is convenient to insert operating theater instruments and is rotated, and the cylinder both sides have and are the inclined-plane boss 11 that antisymmetry distributes.Boss 11 upper surfaces in inclined-plane are inclined-plane 12, and the angle of inclination on inclined-plane 12 is preferably 3 °～6 °.The lower end on inclined-plane, both sides 12 cuts the bigger chamfering 14 of a fritter gradient, makes gland 1 in rotary course, the easier inclined plane groove 42 that enters head of screw 4 inwalls.The lower end of gland 1 cylinder lower end and both sides boss is linked to be a plane 15, and planar central has a small column pin 16.
The described mechanism's gland liner 2 that is fixed is a cuboid, and upper surface is a rectangular planes 21, and circular hole 22 is opened in rectangular planes 21 centers, and gland liner 2 belows cut into arc surface 23.But small column pin 16 centerings of gland 1 lower end embed the circular hole 22 of gland liner 2 upper surfaces.The radius size of gland liner 2 lower end arc surfaces 23 is slightly greater than the radius size of connecting rod 3, makes the arc surface 23 of gland liner 2 lower ends can compress the connecting rod 3 of below with the face way of contact.
Described screw 6 is by being provided with externally threaded screw body 61, its head sphere 62 car ring grains, top opening square hole 64, and its afterbody is a nose cone 63.Described jump ring 5 cooperates with the ring grain of screw 6 head spheres 62, can realize that screw implants fixing after putting in place.
Use:
After screw 6 is implanted in pedicle of vertebral arch and is put in place, jump ring 5 is packed in head of screw 4 corresponding groove 44, the internal ring of jump ring 5 blocks the sphere ring grain of screw 6 heads 62, clamp down on the rotation of screw 6 head spheres 62 in head of screw 4 endoporus 43, screw 6 and head of screw are become one, relative motion no longer takes place.
Connecting rod 3 is put into the U type groove 41 of head of screw 4, put into gland liner 2 from the top.Gland liner 2 lower end arc surfaces 23 fully contact with connecting rod 3 surfaces.
Locking with gland 1 half-twist, embeds in the inclined plane groove 42 of head of screw 4 inwall correspondences inclined-plane boss 11 during connecting rod 3 fully, boss 11 surfaces closely paste with groove 42 surfaces and, rely on pressure and frictional force between the inclined-plane to realize self-locking.Gland 1 is with the descending certain distance of rotation simultaneously, and the gland liner 2 that promotes the below presses down, and makes the arc surface 23 of gland liner 2 belows press connecting rod 3.Make screw 6, head of screw 4 and connecting rod 3 become firm one, strengthen bonded stationarity between vertebra.
Owing to the diameter of gland 1 lower end small column pin 16, be slightly less than the diameter of gland liner 2 upper surfaces 21 circular holes 22.After the small column pin 16 of gland 1 inserted the circular hole 22 of gland liners 2, the axis of gland 1 and gland liner 2 remained basically identical, and gland 1 can not be subjected to below gland liner 2 localized restrictions when rotated, freely rotated.
In the time of pedicle screw device after implanting need being dismantled because of certain reason, only need self-locking is removed in 90 ° of gland 1 reverse rotations, can not have the decomposition of destruction part, and reusable.
Described only is preferred embodiment of the present utility model, and all equalizations of being done according to this utility model claim scope change and modify, and all should belong to the covering scope of this utility model claim.
Claims (10)
1, a kind of medical vertebral arch pedicle screw mechanism, comprise head of screw, this head of screw upper end radially is arranged with the U groove and is nested with a connecting rod, a sheathed tapping screw in this position, the center of circle, head of screw lower end axially extending bore, it is characterized in that: the top that is positioned at connecting rod in the described head of screw U groove is embedded a gland liner, be embedded a gland, a sheathed jump ring between head of screw and screw in the head of screw U groove of this gland liner upper end; When gland during at head of screw U groove internal rotation certain angle, form the inclined-plane self-locking with head of screw inwall radial groove, and descending with the rotation of this gland, the gland liner that promotes its bottom is downwards with the connecting rod of fastening its below, the horizontal movement of restriction connecting rod.
2, according to the described medical vertebral arch pedicle screw mechanism of claim 1, it is characterized in that: described gland is arranged with by a cylinder, its position, the center of circle, top to be convenient to operating theater instruments and to insert the both sides of the hole, angle be rotated, this cylinder outer wall below and be respectively equipped with and be the cylindrical pin that same plane and integrated inclined-plane boss, this position, the center of circle, cylinder baseplane be convexly equipped with downwards with this cylinder bottom and form.
3, according to the described medical vertebral arch pedicle screw mechanism of claim 2, it is characterized in that: the upper surface of inclined-plane, described cylinder both sides boss is the inclined-plane, and two inclined-plane boss are antisymmetry and distribute.
4, according to claim 2 or 3 described pedicle screw mechanisms, it is characterized in that: the lower end, inclined-plane of inclined-plane, described cylinder both sides boss cuts the bigger chamfering in a fritter angle of inclination respectively, make gland in put procedure, the easier inclined plane groove that enters the head of screw inwall.
5. according to the described pedicle screw of claim 3 mechanism, it is characterized in that: the angle of inclination, inclined-plane of described inclined-plane boss is preferably 3 °～6 °.
6. according to the described pedicle screw of claim 1 mechanism, it is characterized in that: described head of screw radially is arranged with inclined plane groove, position, the cylinder center of circle that two cylinder inwalls upper end corresponding position that nested perforation groove, the groove of voltage supply lid inclined-plane boss separate is arranged with respectively by a cylinder, its top and is axially arranged with the vertical through hole that passes through mutually of groove and forms.
7. according to the described pedicle screw of claim 1 mechanism, it is characterized in that: described gland liner is by the lining body of a cuboid, the upper surface of its rectangular planes, this upper surface center is offered voltage supply lid bottom and is convexly equipped with the nested open-work of cylindrical pin, and the arc surface that this lining body lower surface cuts into is formed.
8. according to the described pedicle screw of claim 7 mechanism, it is characterized in that: the diameter that is convexly equipped with cylindrical pin bottom the described gland is slightly less than the diameter of gland liner upper surface open-work, after the cylindrical pin of gland inserts the open-work of gland liner, gland remains consistent with the axis of gland liner, and gland is not subjected to the localized restriction of its below gland liner, and is free to rotate.
9. according to the described pedicle screw of claim 7 mechanism, it is characterized in that: the radius size of the arc surface of described gland liner lower surface is slightly greater than the radius size of connecting rod, makes the arc surface of gland liner lower end can compress the connecting rod of its below with the face way of contact.
10, according to the described medical vertebral arch pedicle screw mechanism of claim 6, it is characterized in that: the through hole that position, the described head of screw cylinder center of circle is axially arranged with by the horn mouth of cylinder bottom, its upper end one section straight hole, straight hole upper end be arranged with the one section through hole that is contraction-like taper hole and passes through and be extended down to the cylinder upper surface with inclined plane groove mutually for the nested groove of jump ring, this groove top with the diameter upwards dispersing bellmouth orifice and connect greater than endoporus, this endoporus upper end edge cylinder inwall of straight hole and form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200936469U CN201185960Y (en) | 2008-04-25 | 2008-04-25 | Medical vertebral pedicle screw nail mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200936469U CN201185960Y (en) | 2008-04-25 | 2008-04-25 | Medical vertebral pedicle screw nail mechanism |
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| Publication Number | Publication Date |
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| CN201185960Y true CN201185960Y (en) | 2009-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200936469U Expired - Lifetime CN201185960Y (en) | 2008-04-25 | 2008-04-25 | Medical vertebral pedicle screw nail mechanism |
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| CN (1) | CN201185960Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961926A (en) * | 2010-09-30 | 2011-02-02 | 浙江圣普新能源科技有限公司 | Biomass fuel forming machine |
| CN103908330A (en) * | 2014-03-31 | 2014-07-09 | 广州医科大学附属第一医院 | Self-guide long-arm solid percutaneous pedicle screw |
| CN105232137A (en) * | 2015-10-29 | 2016-01-13 | 山东航维骨科医疗器械股份有限公司 | Anti-loosing minimally-invasive U-shaped pedicle screw |
| CN105342684A (en) * | 2015-10-29 | 2016-02-24 | 山东航维骨科医疗器械股份有限公司 | U-shaped pedicle screw |
| CN105342677A (en) * | 2015-11-25 | 2016-02-24 | 山东航维骨科医疗器械股份有限公司 | Pedicle screw |
| CN105434021A (en) * | 2015-11-27 | 2016-03-30 | 周建明 | Pedicle screw |
| CN110448369A (en) * | 2013-05-13 | 2019-11-15 | 尼奥医疗公司 | Orthopedic implantation external member |
-
2008
- 2008-04-25 CN CNU2008200936469U patent/CN201185960Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961926A (en) * | 2010-09-30 | 2011-02-02 | 浙江圣普新能源科技有限公司 | Biomass fuel forming machine |
| CN110448369A (en) * | 2013-05-13 | 2019-11-15 | 尼奥医疗公司 | Orthopedic implantation external member |
| CN110448369B (en) * | 2013-05-13 | 2022-08-23 | 尼奥医疗公司 | Orthopedic implant kit |
| CN103908330A (en) * | 2014-03-31 | 2014-07-09 | 广州医科大学附属第一医院 | Self-guide long-arm solid percutaneous pedicle screw |
| CN105232137A (en) * | 2015-10-29 | 2016-01-13 | 山东航维骨科医疗器械股份有限公司 | Anti-loosing minimally-invasive U-shaped pedicle screw |
| CN105342684A (en) * | 2015-10-29 | 2016-02-24 | 山东航维骨科医疗器械股份有限公司 | U-shaped pedicle screw |
| CN105342684B (en) * | 2015-10-29 | 2017-03-29 | 山东航维骨科医疗器械股份有限公司 | A kind of U-shaped pedicle nail |
| CN105342677A (en) * | 2015-11-25 | 2016-02-24 | 山东航维骨科医疗器械股份有限公司 | Pedicle screw |
| CN105434021A (en) * | 2015-11-27 | 2016-03-30 | 周建明 | Pedicle screw |
| CN105434021B (en) * | 2015-11-27 | 2018-06-12 | 周建明 | A kind of pedicle screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN YINGPULAN MEDICAL EQUIPMENT CO., LTD. Free format text: FORMER OWNER: LIU WEIQIANG Effective date: 20090403 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090403 Address after: C, building C729, Institute of Tsinghua University, Nanshan District hi tech Zone, Shenzhen, Guangdong, Shenzhen 518057, China Patentee after: Shenzhen Yingpulan Medical Device Co., Ltd. Address before: Research Institute of Shenzhen Tsinghua University, Shenzhen hi tech Industrial Park, Guangdong 518057, China Patentee before: Liu Weiqiang |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090128 |
|
| CX01 | Expiry of patent term |