WO2019237216A1 - 一种带缓冲功能的低切迹微动态椎弓根钉 - Google Patents

一种带缓冲功能的低切迹微动态椎弓根钉 Download PDF

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WO2019237216A1
WO2019237216A1 PCT/CN2018/000306 CN2018000306W WO2019237216A1 WO 2019237216 A1 WO2019237216 A1 WO 2019237216A1 CN 2018000306 W CN2018000306 W CN 2018000306W WO 2019237216 A1 WO2019237216 A1 WO 2019237216A1
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Prior art keywords
ball stud
spring
groove
pedicle screw
screw according
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PCT/CN2018/000306
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English (en)
French (fr)
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何伟义
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何伟义
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Publication of WO2019237216A1 publication Critical patent/WO2019237216A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A61B17/862—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the periphery of the screw head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
    • A61B17/7064—Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
    • A61B17/7065—Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
    • A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00858—Material properties high friction or non-slip

Definitions

  • the application of the present invention relates to an artificial implant applied to treat lumbar intervertebral disc disease in orthopedic surgery, and specifically, it is suitable for use in orthopedic surgery, and is different from the traditional "rigid fixed fusion surgery".
  • non-fixed fusion surgery a new type of pedicle screw is being explored and developed.
  • Lumbar disc herniation and lumbar spinal canal stenosis are common diseases in modern people's lives.
  • traditional surgical treatment it is often used to remove the protruding intervertebral disc and enlarge the narrow nerve root canal while using the spine "rigid fixed fusion surgery" for treatment.
  • the pedicle screws that are used with it including uniaxial nails and universal screws, are called fixed nails.
  • the vertebral body of the nail can still oscillate at a certain angle relative to the connecting rod, which can stimulate and promote the healing of the diseased part; this type of concept that is gradually being accepted by the academic community is "non-fixed fusion surgery”.
  • Pedicle screws are called "dynamic nails”.
  • notch is the height of the pedicle screw after it is implanted in the vertebral body of the human, and the height of the vertebral body is exposed. In a simple description, it is the height of the nail seat.
  • dynamic nails that have a minimum of “the ability to swing after implantation is complete”
  • the structure is simple and practical, and has the function of "buffering” that can reduce the impact force on the vertebral body, and requires as low as possible notches. So many factors are clinical professionals, and the ideal "dynamic nail” The requirements put forward are also technical problems that need to be solved urgently in the clinical practice of orthopedics.
  • the present application discloses a technical solution capable of effectively solving the above several technical problems at the same time, which is to modify the “universal nail” in the “fixing nail” used in the traditional “rigid fixed fusion surgery” and cancel it.
  • the pressure block was added, the spring was added, and the structure of one of the parts, that is, the head of the ball stud, was improved to meet the basic function of "micro dynamics", and also to meet the "low notch", “Multi-axial”, simple and practical, can reduce the impact of the impact of the clinical technical effects.
  • the top of the spherical head of the ball stud in the traditional "universal nail” is processed into a plane.
  • a circular groove is machined.
  • the spring is a column-shaped compressible type, and both ends are processed into a flat bottom shape that is convenient for vertical standing, so as to be conveniently placed in an annular groove on the ball stud.
  • the spring is placed in the annular groove, and the bottom end surface of the spring is permanently and fixedly connected to the bottom surface of the annular groove, and under no load state, The natural height of the spring should protrude from the plane of the top end of the ball stud.
  • the width of the annular groove should be slightly larger than the wire diameter of the spring, so that the spring can freely expand and contract with a slight swing in the annular groove.
  • the bottom of the U-shaped through groove is used to replace the cancelled block.
  • the bottom of the U-shaped through groove should be higher than the plane of the top end of the ball stud after the assembly is completed, but it should be lower than that of the spring in the natural state after the assembly is completed. Top surface.
  • a pair of kinematic pairs formed by the spherical head of the ball stud and the inner spherical surface in the hollow cavity of the nail seat are all coated with abrasion resistance, or Heat treatment process for anti-wear treatment.
  • a process hole is provided on the side of the bottom of the annular groove of the ball stud. Through this process hole, the bottom end surface of the spring can be fixed by physical means such as welding and pins. At the bottom of the annular groove to prevent the spring from slipping out of the annular groove.
  • FIG. 1 is a two-dimensional view and a partially enlarged view of the application of the present invention
  • Figure 2 is an effect diagram of the application of the present invention.
  • Figure 3 is an explosion effect diagram of the application of the present invention.
  • FIG. 4 is a two-dimensional comparison view of the application of the present invention before and after the connection rod is placed;
  • Figure 5 is a two-dimensional schematic diagram of the working principle of the application of the present invention.
  • FIG. 6 is a schematic diagram of a process hole for fixing a spring in a groove in an embodiment of the present application
  • the downward end of the ball stud 1 that is, the tail, is the same as the traditional fixing nail, and is a section of screw for implantation into the human body.
  • the vertebral body is used for fixation; the top of the spherical head of the ball stud 1 is processed into a plane 12, and after multiple tests and comparisons, the plane is set in this embodiment of the present application.
  • FIG. 2 is an effect diagram of the application of the present invention.
  • the top surface 21 of the spring 2 is a ball head protruding from the ball head.
  • the plane 12 on the nail is higher than the bottom 31 of the U-shaped through groove.
  • FIG. 5 The working principle of the application of the present invention, that is, the technical effects that can be produced by its features, can be clearly seen from FIG. 5 that when a human vertebral body is subjected to an external force, this external force can be basically decomposed into a ball stud perpendicular to the ball stud.
  • the so-called “notch” can be roughly regarded as the height Q of the nail seat 3.
  • the pedicle screws currently in use, whether they are traditional fixing screws or just started The notch of popular dynamic nails is generally 17 ⁇ 19mm. Because the specific size of the screw plug 5 and the connecting rod 4 has been determined by its function, it has basically become a fixed value and can no longer be compressed. The only possible way is An improvement is made on the head of the ball stud 1; the technical solution adopted in the application of the present invention is: the traditional pressing block is eliminated, and the connecting rod 4 is supported by the bottom 31 of the U-shaped through groove; the plane 12 on the ball stud 1 It is reduced to only about 1mm above its center of mass, which saves considerable space. As in the embodiment of the present application, the height of .j is only less than 3mm, that is, in the embodiment of the present application, The notch height Q can be controlled below 14 mm. This is the low notch function possessed by the present application.
  • the center diameter of the annular groove 11 selected in this embodiment is 5 mm, the groove width is 1 mm, and the groove depth is 2.2 to 2.5 mm; and the wire diameter of the spring 2 is 0.7 to 0.8mm, line spacing is about 1.5mm, and the height of the spring 2 is about 3.5mm.
  • the pedicle screws shown in the present application have achieved satisfactory clinical results.
  • the contact surface of the set of motion pairs can reduce The mutual wear that occurs.
  • FIG. 6 shows one of the methods of fixing the spring 2 to the bottom surface of the annular groove 11, namely, drilling a craft hole on the side, and making the bottom end surface 22 of the spring 2 permanent by welding or pins, etc. It is fixed on the bottom surface of the annular groove 11 to prevent it from falling off.

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  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Molecular Biology (AREA)
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Abstract

一种带缓冲功能的低切迹微动态椎弓根钉，包括螺塞（5）、连接棒（4）、钉座（3）、弹簧（2）及球头钉（1），球头钉（1）的向上端，即头部，呈球状，顶端加工出一个平面（12），在此平面上，设有一个环形的凹槽（11），弹簧（2）就安置于此凹槽（11）内。具有低切迹、多轴向、带缓冲作用。

Description

一种带缓冲功能的低切迹微动态椎弓根钉 技术领域
本发明申请涉及一种应用在骨外科手术中治疗腰椎间盘病变的人工植入物，具体来说，就是一种适合应用于骨外科手术中，与传统的“刚性固定融合手术”有所不同的“非固定融合手术”的前沿学科中，正在探索、开发中使用的新型的椎弓根钉。
背景技术
腰椎间盘突出和腰椎管狭窄，是现代人生活中的常见病，传统的外科手术性治疗中，往往是采用摘除突出的椎间盘和扩大狭窄神经根管的同时采用脊椎“刚性固定融合手术”进行治疗，与之配合使用的椎弓根钉，包括单轴钉与万向钉，均被称为固定钉；随着传统学科的不断深入研究，人们发现，如若在手术完结后，所植入椎弓根钉的椎体，依然能相对于连接棒，作一定角度的摆动，就能够有刺激并促进病变部位的愈合；这类正逐渐被学术界接受的“非固定融合手术”的理念所使用的椎弓根钉，则被称为“动态钉”。
由于“动态钉”的概念，还是在探索中，还在不断的实践中，人们提出了不少方案：如专利号为CN201085680Y，名称为“销轴式脊柱钉棒固定钉”的内悬挂式；又如专利号为201510173832.8，名称为“窝臼轨链式复位固定动态椎弓根螺钉系统”等等，要么是无法达到“多轴向”功能，增加手术难度；要么是结构复杂，可操作性低；再如专利号为201620153647.2，所述的“一种微动态椎弓根钉”，虽然避免了上述两个不足之处，但依然是“切迹”过高。
所谓“切迹”，就是椎弓根钉在植入人的椎体后，露出椎体外的高度，用简单的描述，就是钉座的高度。综上所述，临床上，除了要求“动态钉”具有起码的“植入手术完成后，依然可有一定的摆动能力”基本特征之外，还应具有方便临床操作的“多轴向”功能、结构简单实用、有可降低椎体所受的冲击力的“缓冲作用”的功能，并且要求有尽量低的切迹，如此诸多因素均为临床上的学者，对理想中的“动态钉”的所提出的要求，亦是目前摆在骨外科临床上，急需解决的技术难题。
发明内容
本发明申请公布了一种能够有效地同时解决上述数个技术难题的技术方案，就是将传统的“刚性固定融合手术”中所使用的“固定钉”中的“万向钉”进行改造，取消了压块，增 加了弹簧，并主要对其中的一个零件，即球头钉的头部的结构，进行改进，从而满足“微动态”的基本功能外，亦达到同时满足“低切迹”、“多轴向”、简单实用、可减少所受的冲击力等临床上的技术效果。
本发明申请解决其技术问题采用的技术方案具体如下：
首先，将传统的“万向钉”中的球头钉的呈球状的头部的顶端，加工出一个平面，在此平面上，除原有的一个与旋具配合使用的盲孔外，还加工出一个环形的凹槽。
进一步地，所述的弹簧呈柱状可压缩型，且两端加工成便于垂直竖立的平底形，从而便于放置在所述的球头钉上的环形凹槽内。
再进一步地，所述的弹簧放置在所述的环形凹槽内，所述的弹簧的底端面作永久性的固定连接在所述的环形凹槽内的底面，且在无负载的状态下，弹簧的自然高度，应伸出所述的球头钉顶端的平面。
再进一步地，所述的环形凹槽的宽度，应稍大于所述的弹簧的线径，以便所述的弹簧能在环形凹槽内，作自由伸缩与微少的摆动。
再进一步地，所述的钉座除了与传统的“万向钉”所共有的内螺纹、U型通槽等之外，其U型通槽的底部，是用于代替被取消了的压块的作用，去支承所述的连接棒，且U型通槽的底部，应高于装配完成后的所述的球头钉顶端的平面，但应低于装配完成后，自然状态下的弹簧的顶端面。
再进一步地，在所述的球头钉的呈球状的头部，与所述的钉座的中空腔内的呈内球面所形成的一对运动副中，均用耐磨涂层，或用热处理工艺，作抗磨损处理。
再进一步地，在所述的球头钉的环形凹槽的底部的侧面，设置有一个工艺孔，通过这个工艺孔，可以用于将所述的弹簧的底端面用焊接、销钉等物理手段固定在所述的环形凹槽的底部，以防止弹簧从环形凹槽内滑脱掉。
附图说明
下面是各附图和具体特征的说明：
附图1是本发明申请的二维图及局部放大图；
附图2是本发明申请的效果图；
附图3是本发明申请的爆炸效果图；
附图4是本发明申请在置入连接棒前与置入后的二维对比图；
附图5是本发明申请的工作原理的二维示意图；
附图6是本发明申请实施例中，用于将弹簧固定在凹槽中的工艺孔的示意图；
其中：
球头钉1；弹簧2；钉座3；连接棒4；螺塞5；
球头钉上的环状凹槽11；球头钉上的平面12；球头钉上的盲孔13；球头钉上的球面14；
球头钉上的工艺孔15；球头钉的摆动球心O；
弹簧2的顶端面21；弹簧2的底端面22；
钉座上的U型通槽的底部31；钉座上的U型通槽32；钉座上的内螺纹33；钉座上的内球面34
具体实施方式
在下文，再结合附图，对本发明申请作进一步的说明：
从附图1所示的本发明申请的二维图中，可能看出：取消了传统的固定钉中的压块，增加了弹簧2；沿用传统的固定钉中的螺塞5与连接棒4；另外，由于钉座3的U型通槽的底部31向下移，使得整个钉座3的高度，比传统的固定钉的切迹，降低了约5mm。
从附图1的局部放大图，可以看到：本发明申请所示的技术特征：球头钉1的向下端，即尾部，与传统的固定钉相同，均为一段螺杆，用于植入人体的椎体内作固定用；所述的球头钉1的呈球状的头部的顶端，加工出一个平面12，经多次试验及对比，在本发明申请的本实施例中，设定平面12位于球头钉1的头部的球心O的上方1mm处，从而在此平面12上有足够的平面分配给供旋具用的盲孔13与供弹簧2放置的环状凹槽11的位置的同时，亦可保证球头钉1作摆动时作绕其质心O及限位作用。
附图2是本发明申请的效果图，再结合附图1，就可以清楚看到：在连接棒4尚未置入时，所述的弹簧2的顶端面21，是伸出所述的球头钉上的平面12，且高于所述的U型通槽的底部31；在本发明申请的本实施例中，经过测试及做样板观察，认为：h＝0.4～0.6mm，H＝1.2～1.5mm为宜；
为了更清楚地表述本发明申请所示的特征，附图3所示的爆炸图，作出了这样的尝试：环状的凹槽11与球头钉上的盲孔13同处于球头钉的的平面12上；弹簧2的底端面22与顶端面21均被加工成便于竖立的平面；环状凹槽11的底部有一工艺孔15。
如附图4的左图所示的，当未置入连接棒4时，U型通槽的底部31与弹簧2的顶端面21，及球头钉上的平面12的垂直距离分别为H与h；而当植入连接棒4并锁紧螺塞5后，由于取消了压块，连接棒4是直接由U型通槽的底部31所支承，此状态下，连接棒4 与球头钉上的平面12之间的间隙，为K，如附图4的右图所示，即K＝h；
本发明申请的工作原理，即其特征所能产生的技术效果，从附图5可清楚看到：当人的椎体受到外力的作用时，这种外力，基本可分解成垂直于球头钉1的轴线的径向分力Fx与平行于球头钉1的轴线的轴向分力Fy；如附图5的左图所示：当Fy作用时，球头钉1整体上移，使得球头钉上的球面14与钉座上的内球面34作暂时的分离；弹簧2再被压缩，连接棒4与球头钉上的平面12之间的间隙，从K压缩至S，正是这样的压缩，表明弹簧2具有缓冲作用，即已吸收了轴向分力Fy，转换成势能储存起来。
同理，如附图5的右边所示，当Fx作用时，球头钉1会绕其质心O作摆动，同时会导致弹簧2作弯曲变形；特别是当外力F呈突发的冲击力时，此缓冲效果，更明显，而当F消失或减退后，弹簧2必然会将所储存有的势能释放，回复到如附图4右边所示的自然状态-----这就是本发明申请所具有的缓冲功能。
从附图5的左边的图所示，所谓的“切迹”，可以近似地认为，就是钉座3的高度Q，目前在用的椎弓根钉，无论是传统的固定钉，还是刚开始流行的动态钉，其切迹一般为17～19mm；由于螺塞5及连接棒4的具体尺寸，已由其功能作用所确定，已基本成为定值，无法再压缩，唯有可能的做法是在球头钉1的头部作出改进；本发明申请所采用的技术方案是：取消传统的压块，改由U型通槽的底部31支承连接棒4；将球头钉1上的平面12，降低到仅高于其质心约1mm左右，这就节省了相当的空间，如本发明申请的实施例中，.j的高度仅为不足3mm，也就是说，本发明申请的实施例中，其切迹高度Q，可控制在14mm以下-----这就是本发明申请所具有的低切迹功能。
又如附图1的局部放大图所示，在临床手术中，即使所植入病人的椎体内的球头钉1，与相邻的所植入的椎弓根钉存在位置偏差，(临床上的行话称为：钉打偏了；导致相邻的钉的放置连接棒4的U型通槽32不重合)，手术者可以能过摆动钉座3作一定程度的矫正-----这就是本发明申请所具有的“多轴向”功能。
经过一段时间的测试，证明“缓冲功能”可有效地减少“钉松棒断”的医疗事故，但留给安置弹簧3的空间很有限，有实践者在弹簧上想办法，甚至因空间太少，而试图取消弹簧；而本发明申请所示的技术方案，能很巧妙的解决了这个难题：就是降低球头钉上的平面12，既降低了切迹，又为球头钉上的盲孔13与环状的凹槽11留出可分配的空间；而下沉于球头钉上的平面12的环状凹槽11，又为放置弹簧3成为可能，且从而使弹簧3有空间产生缓冲及摆动的作用-------这就是本实用最具有新颖性，最具可操作性的简单实用之处。
在本发明申请的研制及样板测试中，本实施例所选取的环状凹槽11的中心直径为 5mm，槽宽为1mm，槽深为2.2～2.5mm；而弹簧2的线径为0.7～0.8mm，线距约1.5mm，弹簧2高度约为3.5mm较合适，在此参数下，本发明申请所示的椎弓根钉，均取得较理想的临床效果。
由于球头钉上的球面14与钉座上的内球面34形成一组运动副，在所述的这组运动副的接触面上，加上能够减少磨损的涂层或表面处理，则可以减轻所发生的相互磨损。
值得注意的是，如前所述，“非固定融合手术”的理念，仍在不断探索与实践中，而“微动态促进固定融合”及“非融合固定”等同属于这个理念中的不同的分支，其主要区别是，前者是利用微少的摆动，去刺激伤口的愈合；而后者则是利用较大的摆动，去促使手术后的椎体与相邻的椎体，产生良性互动，从而避免病变部位延伸；而至于具体的摆动角度，还是一个正在不断论述的过程中，而本发明申请所示的技术方案，亦能产生符合以上两种探索方向的技术效果；如附图4的右边的图所示，只要调节U型通槽的底部31与球头钉上的平面12的间隙K，以及相应的弹簧2的参数，则可达到不同的摆动角度。
在本发明申请的实施例中，当K＝0.3～0.5mm时，摆动角度约为2～4度；而当K＝1～1.5mm左右，则摆动角度可达8～12度；从此可知，无论“非固定融合手术”的理念的发展，是朝“微动态促进固定融合”还是朝“非融合固定”方向发展，亦无论所需要的摆动角度量化结果如何，本发明申请只需调整某些参数，即可满足其临床需要。-----这亦是本发明申请所具有的前瞻性之处。
附图6所示的是：将弹簧2固定在环状凹槽11的底面的方法之一，即在侧面钻出一个工艺孔，用焊接或是销钉等将弹簧2的底端面22作永久性固定在环状凹槽11的底面，以防止其脱落。
上述实施例为本发明申请优选实施方式，其他凡其原理和基本结构与本实施例相同或近似的，均在本发明申请保护范围之内。

Claims (10)

  1. 一种带缓冲功能的低切迹微动态椎弓根钉，包括螺塞、连接棒、钉座、弹簧及球头钉，其特征在于：所述的球头钉的向上端，即头部，呈球状，顶端加工出一个平面，在此平面上，设有一个环形的凹槽，所述的弹簧就安置于此凹槽内。
  2. 根据权利要求1所述的椎弓根钉，其特征在于：所述的弹簧呈柱状可压缩型，且两端加工成便于垂直竖立的平底形。
  3. 根据权利要求2所述的椎弓根钉，其特征在于，所述的弹簧安置于所述的环形凹槽后，弹簧的底端面应与凹槽的底部作永久性的固定连接，且弹簧的自然高度，应伸出于所述的球头钉顶端的平面。
  4. 根据权利要求1所述的椎弓根钉，其特征在于：所述的球头钉上的环形凹槽的槽的宽度，应稍大于所述的弹簧的线径，即可以使得所述的弹簧在所述的凹槽内，作自由伸缩与微少摆动。
  5. 根据权利要求1所述的椎弓根钉，其特征在于：所述的球头钉的顶端的平面的中央，设有一个与旋具配合使用的盲孔；所述的球头钉的向下端，即尾部，是外表面具有螺纹的一段螺杆。
  6. 根据权利要求1所述的椎弓根钉，其特征在于：所述的钉座是一个中空的圆柱体，中空腔内的底部，呈内球面，与所述的球头钉的头部配合，而所述的球头钉的尾部，从钉座的下方穿出。
  7. 根据权利要求6所述的椎弓根钉，其特征在于：所述的钉座的上方，设有内螺纹，与所述的螺塞相配合，在所述的钉座的轴线的垂直的方向，开有一个U形通槽，U形通槽的底部，用于支承所述的连接棒。
  8. 根据权利要求7所述的椎弓根钉，其特征在于：所述的钉座上的U形通槽的底部，应高于装配完成后的所述的球头钉顶端的平面，但应低于自然状态下的弹簧的顶端面。
  9. 根据权利要求1所述的椎弓根钉，其特征在于：在所述的球头钉的呈球状的头部与所述的钉座的中空腔底部的呈内球面所形成的一对运动副中，均作抗磨损的表面处理。
  10. 根据权利要求1所述的椎弓根钉，其特征在于：在所述的球头钉上，所述的环形凹槽的底部的侧面，设置有一个工艺孔，用于将所述的弹簧的底端面用焊接、销钉等手段固定在所述的环形凹槽的底部。
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