JPH10165412A - Spacer for atlas and axis fixing - Google Patents

Spacer for atlas and axis fixing

Info

Publication number
JPH10165412A
JPH10165412A JP8352226A JP35222696A JPH10165412A JP H10165412 A JPH10165412 A JP H10165412A JP 8352226 A JP8352226 A JP 8352226A JP 35222696 A JP35222696 A JP 35222696A JP H10165412 A JPH10165412 A JP H10165412A
Authority
JP
Japan
Prior art keywords
spacer
atlas
screw member
axis
jikushi
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8352226A
Other languages
Japanese (ja)
Inventor
Satoshi Kojima
Yasuaki Tokuhashi
聡 小島
泰明 徳橋
Original Assignee
Asahi Optical Co Ltd
旭光学工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Optical Co Ltd, 旭光学工業株式会社 filed Critical Asahi Optical Co Ltd
Priority to JP8352226A priority Critical patent/JPH10165412A/en
Publication of JPH10165412A publication Critical patent/JPH10165412A/en
Application status is Pending legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8625Shanks, i.e. parts contacting bone tissue
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8645Headless screws, e.g. ligament interference screws
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7047Clamps comprising opposed elements which grasp one vertebra between them
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8625Shanks, i.e. parts contacting bone tissue
    • A61B17/863Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Threaded wires, pins or screws; Nuts therefor
    • A61B17/8625Shanks, i.e. parts contacting bone tissue
    • A61B17/8635Tips of screws
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30138Convex polygonal shapes
    • A61F2002/30143Convex polygonal shapes hexagonal
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772Apertures or holes, e.g. of circular cross section
    • A61F2002/3079Stepped or enlarged apertures, e.g. having discrete diameter changes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/3085Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
    • A61F2002/30861Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface having threads of increasing or decreasing height
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/3085Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
    • A61F2002/30863Special external or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface the entry end surface having flutes, relief grooves, starter notches or bevelled indentations
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017Angular shapes

Abstract

PROBLEM TO BE SOLVED: To enable to fix the atlas and the axis in both vertical and rotational directions with simple operation, by constituting a spacer for atlas fixing by a screw member to be horizontally inserted in between the atlas and the axis from the rear side and fixing the screw member with the atlas and the axis by screwing. SOLUTION: In a condition a spacer 1 is inserted between vertebras 55, a screw part 12 is screwed with an atlas 5 and an axis 6 to fix the atlas 5 and the axis 6 so as not be moved in the front-back direction and relatively rotate between the vertebras 55. At that time, the spacer 1 is used together with a clamp 3 which vertically clamps and holds the atlas and the axis, hook- shaped hooks 31, 32 are oppositely placed, the interval is adjusted by an adjusting screw part 33, hooks 31, 32 are hooked on arches of vertebra 52, 62, the interval between hooks 31, 32 is narrowed by the adjusting screw part 33, and the atlas 5 and the axis 6 are clamped in the vertical direction to be fixed.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、亜脱臼等でずれた環椎と軸椎を固定するため椎間に嵌入される環軸椎固定用スペーサーに関するものである。 The present invention relates to relates to a ring axis vertebral fixing spacer is fitted in the intervertebral for securing the Atlas and Jikushi shifted by subluxation like.

【0002】 [0002]

【従来の技術】従来より、環椎(第1頸椎)と軸椎(第2頸椎)が亜脱臼等によりずれた場合の固定方法として、環椎と軸椎の間に移植骨を挟んでワイヤで締結固定する骨移植法と、軸椎の下方から環椎に向けて斜めにスクリューを貫通させ両者を螺合固定するマーゲル法が知られている。 Hitherto, as a fixing method when the atlas (the first cervical vertebra) and Jikushi (second cervical vertebra) is shifted by subluxation like, across the bone graft between the atlas and Jikushi wire bone grafting method that fastened in, screwed fixed to Mageru method is known both to penetrate the screw obliquely toward the atlas from below the Jikushi. しかしながら、骨移植法では、移植骨の採骨のため別途手術を行う必要があり、マーゲル法では、 However, in the bone graft method, it is necessary to perform a separate surgery for Tohone of bone graft, in the Mageru method,
環椎及び軸椎の周辺の血管・神経に触れないようにスクリューをねじ込む必要があることから、作業が難しく手術時間が長くなるという問題点があった。 It is necessary to screw the screw to avoid touching the blood vessels, nerves near the atlas and Jikushi, there is a problem that work difficult operating time becomes longer.

【0003】そこで、近年、金属製のクランプを用いて環椎と軸椎を上下方向に締め付けて固定する方法(所謂フック法)が提案されている。 [0003] In recent years, a method of fixing by tightening the Atlas and Jikushi in the vertical direction using a clamp made of metal (so-called hook method) has been proposed. クランプは一対の鍵型のフックを備えており、このフックを環椎と軸椎の夫々弓状になった部位(椎弓)に引っ掛けて締め付けるよう構成されている。 Clamp is constructed pair of has a key-shaped hook, so tightening hook the hook portion became atlas and Jikushi respective arcuate (vertebral arch).

【0004】 [0004]

【解決しようとする課題】ここで、環椎及び軸椎は、人体の旋回に伴って相対回転する部位であるが、亜脱臼等の処置ではこれらが回転しないように固定する必要がある。 A It is an object to Here, atlanto and Jikushi is a portion for relative rotation with the body of the swing, the treatment of subluxation, etc. has to be fixed so they do not rotate. しかしながら、上記のような上下方向に締め付けるクランプでは、環椎及び軸椎を回転方向に固定する力が弱いという問題点があった。 However, in the clamp tightened the vertical direction as described above, the force for fixing the Atlas and Jikushi in the rotational direction is disadvantageously weak.

【0005】本発明は、上記のような事情に鑑み、簡単な操作で、環椎と軸椎を上下方向及び回転方向に固定できるようにすることを目的とするものである。 [0005] The present invention has been made in view of the circumstances as described above, by a simple operation, it is an object to be able to fix the Atlas and Jikushi in the vertical direction and the rotation direction.

【0006】 [0006]

【課題を解決するための手段】上記の課題を解決するため、本発明は、環椎と軸椎の椎間に後方から水平に嵌入されるねじ部材によって環軸椎固定用スペーサーを構成し、ねじ部材が環椎及び軸椎と螺合することによって、 To solve the above object, according to an aspect of the present invention constitutes a ring axis vertebral fixing spacer by a screw member which is inserted horizontally from the rear to the intervertebral the atlas and Jikushi, by screw member is screwed and atlas and Jikushi,
環椎と軸椎とを前後方向に相対移動しないよう固定するよう構成したものである。 Those configured to secured against relative movement and Atlas and Jikushi in the longitudinal direction.

【0007】椎間は環椎と軸椎の相対回転の軸に対し左右に位置するため、上記のように椎間において環椎と軸椎とを前後方向に相対移動しないよう固定すれば、環椎と軸椎とを相対回転しないよう固定することができる。 [0007] Because the intervertebral is located on the left and right with respect to the axis of relative rotation of the atlas and Jikushi, be fixed so as not to move relative to the longitudinal direction of the Atlas and Jikushi in intervertebral As described above, the ring it can be fixed so as not to rotate relative to the vertebral and Jikushi.
そのため、環椎と軸椎を上下から締め付けて挟固定するクランプと併用すれば、環椎と軸椎をより確実に回転方向及び上下方向に固定することができる。 Therefore, when combined with the clamp for clamping fixing by tightening the Atlas and Jikushi from above and below, it is possible to fix the Atlas and Jikushi more reliably rotated and vertical directions.

【0008】なお、上記のねじ部材の長さを4ミリ以上12ミリ以下とすれば、環軸椎の椎間にねじ部材を嵌入させた状態で、ねじ部材が水平に突出することがない。 [0008] Incidentally, if the following 12 mm 4 mm or the length of the threaded member, in a state of being fitted into the screw member into the intervertebral ring axis vertebra, never screw member projects horizontally.
また、ねじ部材の外径を4ミリ以上7ミリ以下とし、谷の径を3ミリ以上5ミリ以下とすれば、ねじ部材を環軸椎の椎間に嵌入した状態で、ねじ部材を確実に環椎と軸椎に螺合させることができる。 Further, the outer diameter of the screw member and 4 mm or 7 mm or less, if the diameter of the recess 3 mm or more 5 mm or less and, in a state of fitting the screw members into the intervertebral ring axis vertebra, securely threaded member it can be screwed into the atlas and Jikushi.

【0009】また、ねじ部材を、頭部を持たず且つ後端に六角穴を有するねじ部材(所謂六角穴付き止めねじ) Further, the screw member having a hexagon socket screw member, to and back end without a head (so-called hexagonal socket set screw)
として構成することもできる。 It can also be configured as. ねじ部材が頭部を持たないため、環椎と軸椎の椎間にねじ部材を嵌入した状態で後方にはみ出す部分がない。 Since the screw member has no head, no portion protruding rearward while fitting the screw members into the intervertebral the atlas and Jikushi. また、六角穴を持つため、 In addition, in order to have a hexagonal hole,
ねじ部材を環軸椎の椎間に嵌入する際には、細い六角棒スパナを使ってねじ部材を回動することができる。 When fitting the screw members into the intervertebral ring axis vertebra can rotate the threaded member with the narrow hexagon wrench.

【0010】さらに、ねじ部材の先端にテーパ部を設け、さらに先端に切り欠きを備えたセルフタッッピングねじとして構成すると、環軸椎の椎間にねじ部材を回転させながら嵌入することにより、椎間に雌ねじを加工しながら該雌ねじに螺合することが可能になる。 Furthermore, a tapered portion provided at the tip of the screw member, further configured as a self-tap Tsu ping screw having a notch at the tip, by fitting while rotating the screw member into the intervertebral ring axis vertebra, while machining a female screw on the intervertebral becomes possible screwed into the female screw.

【0011】また、ねじ部材の径方向中心部に、該ねじ部材を軸方向に貫通する貫通孔を形成すれば、環椎と軸椎の椎間にスペーサーを嵌入させる際に、椎間にガイドワイヤを予めさし込んでおき、このガイドワイヤを通した状態でスペーサーを嵌入させることができるため、簡単且つ確実にスペーサーを目的地に案内することができる。 Further, in the radial center portion of the screw member, by forming a through hole passing through the screw member in the axial direction, when causing fitting the spacer between the vertebral the atlas and Jikushi, guide intervertebral advance by inserting the wire advance, the guide for the wire can be fitted a spacer in a state in which through, can be guided to the destination easily and reliably spacer. なお、隣接するねじ山の間が円形状になるよう構成すると、環椎及び軸椎に対する食い込みがよくなり、椎間に簡単に雌ねじを形成することが可能になる。 Incidentally, when between adjacent threads is configured to be circular, the better the bite against Atlas and Jikushi, it is possible easily to form the internal thread on the intervertebral. また、 Also,
スペーサーをチタン合金製とすれば、生体との適合性が良好である。 If the spacer is made of titanium alloy, it is good compatibility with a living body.

【0012】 [0012]

【発明の実施の形態】次に、本発明の実施の形態について説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention is explained. 図1及び図2は、環椎5(第1頸椎)及び軸椎6(第2頸椎)及び実施形態の環軸椎固定用スペーサー1を示す斜視図である。 Figures 1 and 2 are perspective views showing the atlas 5 (first cervical vertebra) and Jikushi 6 ring shaft vertebral fixing spacer 1 (second cervical vertebra) and embodiments. 図1に示すように、環椎5 As shown in FIG. 1, atlanto 5
と軸椎6の間の関節面である椎間55は、人体の旋回に伴う回転軸Oに対して左右に位置している(図1では左側の椎間55のみが示されている)。 The intervertebral 55 is articular surface between the Jikushi 6 is positioned to the left and right with respect to the rotation axis O are associated with human body pivot (only the left facet 55 is shown in FIG. 1). 実施形態の環軸椎固定用スペーサー1は、この左右の椎間55に後方から水平に嵌入されるねじ部材として構成される。 Ring axis vertebra fixation Spacer 1 embodiment is configured as a screw member which is inserted horizontally from the rear to the right and left of the intervertebral 55.

【0013】図2はスペーサー1の斜視図であり、図3 [0013] Figure 2 is a perspective view of the spacer 1, 3
及び図4はスペーサー1の側面図及び正面図である。 And FIG. 4 is a side view and a front view of the spacer 1. スペーサー1は、軸方向後端部に六角棒スパナ(図示せず)に係合する六角穴11を有するねじ部材であり、且つ頭部を持たないものである。 Spacer 1 is a screw member having a hexagonal hole 11 to be engaged with the axially rear end the hexagonal wrench (not shown), is and having no head. 即ち、スペーサー1は、 In other words, the spacer 1,
所定の雌ねじ部に螺合させると、頭部を突出させることなく当該雌ねじ部に完全に収容される所謂六角穴付き止めねじである。 When screwed into the predetermined female thread portion, a so-called hexagonal socket set screw is completely accommodated in the internally threaded portion without projecting the head.

【0014】また、図3及び図4に示すように、スペーサー1の軸方向先端には、テーパ部13が設けられている。 Further, as shown in FIGS. 3 and 4, the axial tip of the spacer 1, the tapered portion 13 is provided. そして、当該テーパ部13を含む先端部にはみぞタップのような切り欠き14が2カ所形成されている。 The notches 14, such as grooves taps the distal end portion including the tapered portion 13 is formed at two. 即ち、スペーサー1を所定の下穴にねじ込むと、切り欠き14が下穴の内面に食いつき、ねじ部12により当該内面をねじ加工しながら螺合する。 That is, when screwing the spacer 1 at a predetermined prepared hole, notch 14 bite in the inner surface of the prepared hole, the threaded portion 12 is screwed with the inner surface and threading. 即ち、スペーサー1は所謂セルフタッピングねじである。 That is, the spacer 1 is a so-called self-tapping screws.

【0015】さらに、スペーサー1の径方向中心部には、スペーサー1を軸方向に貫通する貫通孔15が形成されている。 Furthermore, in the radial center part of the spacer 1, a through hole 15 penetrating the spacer 1 in the axial direction is formed. この貫通孔15は、椎間55(図1)への嵌入作業の際に、後述のガイドワイヤを挿通するためのものである。 The through-hole 15, when the fitting work of the intervertebral 55 (FIG. 1), is intended for inserting the later-described guide wire. また、スペーサー1は生体との親和性の良好なチタン合金で構成されている。 Further, the spacer 1 is formed with an affinity of better titanium alloy with biological.

【0016】次に、スペーサー1の寸法について説明する。 [0016] Next, a description will be given of the size of the spacer 1. 図5は、スペーサー1を環椎5と軸椎6の椎間55 5, intervertebral 55 of the spacer 1 Atlas 5 and Jikushi 6
に嵌入した状態を示す側断面図である。 It is a side sectional view showing a fitted state to. 椎間55の前後方向の幅Hは一般的に20mm程度である。 Width H in the longitudinal direction of the intervertebral 55 is generally about 20 mm. そのため、 for that reason,
スペーサー1の全長L(図3)は、スペーサー1が椎間55の内部に完全に収まり、椎間55から後方に突出することがないよう、4mm以上12mm以下に設定される。 The total length of the spacer 1 L (FIG. 3), the spacer 1 is inserted completely inside the intervertebral 55, so as not to protrude from the intervertebral 55 backwards, is set to be 4mm or 12mm or less.

【0017】また、図5に示す椎間55の間隔Dは一般的に2mm程度である。 [0017] The distance D of the intervertebral 55 shown in FIG. 5 is generally about 2 mm. そのため、スペーサー1のねじ部12が環椎5及び軸椎6に螺合するよう、ねじ部12 Therefore, as the threaded portion 12 of the spacer 1 is screwed to the Atlas 5 and Jikushi 6, threaded portion 12
の外径A(図3)は4mm以上7mm以下に設定され、 The outer diameter A (Fig. 3) is set to 4mm or 7mm or less,
ねじ部12の谷の径B(図3)は3mm以上5mm以下に設定される。 Diameter of the recess of the threaded portion 12 B (FIG. 3) is set below 5mm or 3 mm.

【0018】椎間55の寸法には個人差があるため、スペーサー1の寸法は複数種類設定される。 [0018] Since there is individual difference in the size of the intervertebral 55, the dimensions of the spacer 1 is a plurality of types set. 本実施形態のスペーサー1の全長L、ねじ部外径A及びねじ部の谷径Bの組み合わせの例を以下の表1に示す。 The total length L of the spacer 1 of the present embodiment, an example of a combination of the root diameter B of the screw outer diameter A and a screw portion shown in Table 1 below. なお、L, In addition, L,
A,Bが夫々上記の範囲内であれば、表1以外の組み合わせも可能である。 A, if B is within the range of each above combinations are possible other than those listed in Table 1.

【0019】 [0019]

【表1】 L(mm) A(mm) B(mm) 8.0 5.0 3.5 8.0 5.5 3.5 10.0 6.0 4.0 10.0 6.5 4.5 [Table 1] L (mm) A (mm) B (mm) 8.0 5.0 3.5 8.0 5.5 3.5 10.0 6.0 4.0 10.0 6.5 4.5

【0020】このように構成されたスペーサー1は、椎間55に嵌入された状態でねじ部12が環椎5と軸椎6 [0020] Spacer 1 configured in this way, the screw portion 12 in a state of being fitted into the intervertebral 55 Atlas 5 and Jikushi 6
に螺合するため、椎間55において環椎5と軸椎6とが前後方向に相対移動しないよう固定される。 To screwed into, atlas 5 and the Jikushi 6 is secured against relative movement in the longitudinal direction in the intervertebral 55. そのため、 for that reason,
図6に背面図として示すように、左右の椎間55にスペーサー1を嵌入し、両椎間55において環椎5と軸椎6 As shown as a rear view in Figure 6, the spacer 1 is fitted into the left and right facet 55, and atlanto 5 in both the intervertebral 55 Jikushi 6
の前後に相対移動しないよう固定すれば、環椎5と軸椎6を相対回転(矢線Rに示す)しないよう固定することができる。 Be fixed so as not to move relative to the front and rear, it can be secured against the Atlas 5 and Jikushi 6 rotate relative (shown by the arrow R).

【0021】ここで、図5及び図6に示すように、スペーサー1は環椎5と軸椎6を上下から鋏んで保持するクランプ3と併用される。 [0021] Here, as shown in FIGS. 5 and 6, the spacer 1 is used with a clamp 3 which holds across the Atlas 5 and Jikushi 6 from above and below. クランプ3は、2つの鍵型のフック31,32を備えている。 Clamp 3 is provided with two key-shaped hooks 31 and 32. 両フック31,32は互いに対向配置され、調整ねじ部33によってその間隔を調整できるよう構成されている。 Hooks 31, 32 are opposed to each other, and is configured to be able to adjust its spacing by adjusting screw 33.

【0022】両フック31,32は、環椎5及び軸椎6 [0022] The hooks 31 and 32, the atlas 5 and Jikushi 6
の弓状部位である椎弓52,62に引っ掛けられ、両フック31,32の間隔を調整ねじ部33により狭めることによって、環椎5と軸椎6とを上下方向に締め付けて固定することができる。 Hooked on a arcuate portion vertebral arch 52 and 62, by narrowing the adjusting screw 33 the spacing of the hooks 31 and 32, be secured by tightening the Atlas 5 and Jikushi 6 in the vertical direction it can. 即ち、クランプ3によって環椎5と軸椎6とを上下方向に締め付けて固定すると共に、 That is, the fixing by tightening the Atlas 5 and Jikushi 6 by clamp 3 in the vertical direction,
スペーサー1によって環椎5と軸椎6とを相対回転しないよう固定することによって、環椎5と軸椎6をより確実に固定することができる。 By secured against relative rotation and Atlas 5 and Jikushi 6 by a spacer 1, it is possible to reliably fix the Atlas 5 and Jikushi 6.

【0023】次に、スペーサー1の椎間55への嵌入方法について図7を参照して説明する。 Next, the fitting method of the intervertebral 55 of the spacer 1 will be described with reference to FIG. 図7(a)に示すように、スペーサー1を案内するためのガイドワイヤ4 As shown in FIG. 7 (a), the guide wire 4 for guiding the spacer 1
1を椎間55に挿入する。 To insert a 1 to intervertebral 55. ガイドワイヤ41は、図3に示すスペーサー1の貫通孔15に挿通され、スペーサー1を確実に椎間55に導くものである。 The guidewire 41 is inserted into the through hole 15 of the spacer 1 shown in FIG. 3, and guides to ensure intervertebral 55 spacer 1. スペーサー1の嵌入作業に用いられる工具類には、スペーサー1の貫通孔15と同様の貫通孔が形成されており、工具類を簡単且つ確実に椎間55に導くことができる。 The tooling used for fitting work of the spacer 1, the through-holes similar to the through-hole 15 of the spacer 1 is formed, it is possible to direct the tooling to easily and reliably intervertebral 55.

【0024】ガイドワイヤ41を嵌入した後、図7 [0024] After fitting the guide wire 41, Fig. 7
(b)に示すようにガイドワイヤ41に沿ってドリル4 Drill 4 along the guide wire 41 as shown in (b)
2を挿入し、椎間55に下穴を加工する。 2 Insert the processes the prepared hole into the intervertebral 55. 次いで、図7 Then, as shown in FIG. 7
(c)に示すように、ドリル42により形成された下穴58にスペーサー1を嵌入させる。 As shown in (c), to the lower hole 58 formed by drilling 42 fitting the spacer 1. スペーサー1は、後端の六角穴11(図2)に嵌入された六角棒スパナ45 Spacer 1, hexagonal hole 11 of the rear hexagonal wrench 45 is fitted (FIG. 2)
により回転操作される。 It is rotationally operated by. スペーサー1はセルフタッピングねじなので、六角棒スパナ45によりスペーサー1を下穴58に回転させながら嵌入することにより、下穴5 Since the spacer 1 is a self-tapping screw, by fitting while rotating the spacer 1 in the prepared hole 58 by a hexagonal wrench 45, the prepared hole 5
8に雌ねじが加工され、当該雌ねじにスペーサー1が螺合する。 8 female thread is machined in the spacer 1 is screwed to the female screw.

【0025】ここで、スペーサー1の先端には切り欠き14(図3)が形成されているため、下穴58の内面に食いつき易い。 [0025] Here, since the notches 14 at the distal end of the spacer 1 (FIG. 3) are formed easily bite the inner surface of the prepared hole 58. また、ねじ部12は、隣接するねじ山1 Also, threaded portion 12, adjacent the threads 1
2の間の断面が半円形状になるよう形成されており(図3にrで示す)、それだけねじ山が鋭角に形成されているため、ねじ山が下穴58の内面に食い込み易く、簡単に下穴58に雌ねじを形成することができる。 Cross between 2 are formed so as to be semicircular (indicated by r in FIG. 3), since the more threads are formed at an acute angle, easy thread bites into the inner surface of the prepared hole 58, easy it is possible to form an internal thread in the pilot hole 58. なお、スペーサー1を下穴58に嵌入させる前に、下穴58に予備のねじ加工を施しておくことも可能である。 Incidentally, prior to fitting the spacer 1 in the prepared hole 58, it is also possible to have undergone a preliminary threaded into the prepared hole 58.

【0026】スペーサー1を椎間の略中央部まで嵌入させ、スペーサー1が後方に突出することなく完全に椎間55の内部に収容されると、ガイドワイヤ41を椎間5 [0026] The spacer 1 is fitted to the substantially central portion of the intervertebral the spacer 1 is housed entirely within the intervertebral 55 without protruding rearwardly, the guide wire 41 intervertebral 5
5から引き抜き、スペーサー1の椎間55への嵌入作業は完了する。 Withdrawal from 5, fitting work to intervertebral 55 of the spacer 1 is completed. このスペーサー1の嵌入作業完了後に、クランプ3による環椎5と軸椎6の締め付け固定作業が行われるが、これについては説明を省略する。 After fitting work completion of the spacer 1, but clamping work Atlas 5 and Jikushi 6 by the clamp 3 is made, it will not be described this.

【0027】このように、本実施形態によると、椎間5 [0027] Thus, according to this embodiment, the intervertebral 5
5に嵌入されたスペーサー1が環椎5と軸椎6に螺合することによって、環椎5と軸椎6を相対回転しないよう固定するが可能になる。 By fitting by spacer 1 is screwed to the atlas 5 and Jikushi 6 to 5, allowing it to secured against relative rotation Atlas 5 and Jikushi 6. そのため、環椎5と軸椎6を上下から挟み込んで固定するクランプ3と併用すれば、回転方向及び上下方向に確実に環椎5と軸椎6とを固定することができる。 Therefore, when combined with the clamp 3 for securing sandwich the Atlas 5 and Jikushi 6 from above and below, it is possible to reliably fix the Atlas 5 and Jikushi 6 in the rotational direction and the vertical direction. また、スペーサー1が椎間55から後方に突出しないため、他の組織あるいはクランプ取り付けの邪魔になることが無い。 Further, since the spacer 1 does not protrude rearward from the intervertebral 55, it is not to get in the way of other tissues or clamp mounting.

【0028】 [0028]

【発明の効果】以上説明したように、本発明によると、 As described in the foregoing, according to the present invention,
環軸椎固定用スペーサーを、環椎と軸椎の椎間に後方から水平に嵌入されるねじ部材により構成し、ねじ部材が環椎及び軸椎に螺合することにより環椎と軸椎とを前後方向に相対移動しないよう固定することができる。 The ring shaft vertebral fixing spacer, constituted by a screw member which is inserted horizontally from the rear to the intervertebral the atlas and Jikushi, and Atlas and Jikushi by screw member is screwed to the atlas and Jikushi it can be fixed so as not to move relative to the longitudinal direction. 椎間は環椎と軸椎の相対回転の軸に対し左右に位置するため、上記のように椎間において環椎と軸椎とを前後方向に固定すれば、環椎と軸椎とを相対回転しないよう固定することができる。 Since intervertebral is located on the left and right with respect to the axis of relative rotation of the atlas and Jikushi, it is fixed to the Atlas and Jikushi in the longitudinal direction in the intervertebral As described above, relative to the Atlas and Jikushi it can be fixed against rotation. そのため、環椎と軸椎を上下から締め付けて挟固定するクランプと併用すれば、環椎と軸椎をより確実に回転方向及び上下方向に固定することができる。 Therefore, when combined with the clamp for clamping fixing by tightening the Atlas and Jikushi from above and below, it is possible to fix the Atlas and Jikushi more reliably rotated and vertical directions.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】 実施形態の環軸固定用スペーサーと環椎及び軸椎を示す斜視図である。 1 is a perspective view showing a ring shaft fixing spacer and Atlas and Jikushi embodiment.

【図2】 図1の環軸固定用スペーサーの斜視図である。 2 is a perspective view of a ring shaft fixing spacer of Figure 1.

【図3】 図1の環軸固定用スペーサーの側断面図である。 3 is a side sectional view of the ring shaft fixing spacer of Figure 1.

【図4】 図1の環軸固定用スペーサーの正面図である。 4 is a front view of the ring shaft fixing spacer of Figure 1.

【図5】 図1の環軸固定用スペーサーを環軸椎の椎間に固定した状態を示す側断面図である。 5 is a side sectional view showing a fixed state between the vertebral ring shaft fixing spacer ring axis vertebra of FIG.

【図6】 図1の環軸固定用スペーサーを環軸椎の椎間に固定した状態を示す背面図である。 6 is a rear view showing the fixed state between the vertebral ring shaft vertebral ring shaft fixing spacer of Figure 1.

【図7】 図1の環軸固定用スペーサーを環軸椎の椎間への嵌入作業を示す側断面図である。 7 is a side sectional view showing a fitting work of the ring shaft fixing spacer of Figure 1 to the intervertebral ring axis vertebra.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 スペーサー 11 六角穴 12 ねじ部 13 テーパ部 14 切り欠き 15 貫通孔 3 クランプ 31,32 フック 33 調整ねじ部 5 環椎 55 椎間 6 軸椎 1 spacer 11 hexagonal hole 12 threaded portion 13 tapered portion 14 notched 15 through hole 3 clamps 31, 32 hook 33 adjusting screw portion 5 atlas 55 intervertebral 6 Jikushi

Claims (11)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 環椎と軸椎の椎間に後方から水平に嵌入されるねじ部材により構成され、 前記ねじ部材が前記椎間において前記環椎及び前記軸椎と螺号し、前記環椎と前記軸椎とを前後方向に相対移動しないよう固定すること、を特徴とする環軸椎固定用スペーサー。 1. A is constituted by a screw member which is inserted horizontally from the rear to the intervertebral the atlas and Jikushi, the screw member is threadedly engaged with the atlas and the axis intervertebral between the vertebrae and the atlanto ring axis vertebra fixing spacer, characterized in that, to fix so as not to move relative to said shaft intervertebral in the front-rear direction.
  2. 【請求項2】 前記ねじ部材の長さは、4ミリ以上12 The length of wherein said screw member is 4 mm or more 12
    ミリ以下であること、を特徴とする請求項1に記載の環軸椎固定用スペーサー。 It is a millimeter or less, the ring shaft vertebral fixing spacer of claim 1, wherein the.
  3. 【請求項3】 前記ねじ部材の外径は、4ミリ以上7ミリ以下であること、を特徴とする請求項1又は2に記載の環軸椎固定用スペーサー。 The outer diameter of wherein the threaded member is not more than 4 mm more than 7 mm, the ring shaft vertebral fixing spacer of claim 1 or 2, characterized in.
  4. 【請求項4】 前記ねじ部材の谷の径は、3ミリ以上5 Diameter of the recess according to claim 4, wherein said screw member is 3 mm or more 5
    ミリ以下であること、を特徴とする請求項1から3のいずれかに記載の環軸椎固定用スペーサー。 Ring axis vertebra fixation spacers according It is millimeter or less, from claim 1, wherein the one third.
  5. 【請求項5】 前記ねじ部材は、頭部を持たず且つ後端に六角穴を有する六角穴付き止めねじとして構成されること、を特徴とする請求項1から4のいずれかに記載の環軸椎固定用スペーサー。 Wherein said screw member is ring according to any one being constructed as a hexagon socket set screw and having a hexagon socket in the rear end without a head, from claim 1, wherein the fourth Jikushi fixing spacer.
  6. 【請求項6】 前記ねじ部材は、先端部にテーパを有すること、を特徴とする請求項1から5のいずれかに記載の環軸椎固定用スペーサー。 Wherein said screw member, the ring shaft vertebral fixing spacer as claimed in any of claims 1 5, characterized in, that it has a tapered tip.
  7. 【請求項7】 前記ねじ部材は、先端部に切り欠き部を備えたセルフタッッピングねじであること、を特徴とする請求項1から6のいずれかに記載の環軸椎固定用スペーサー。 Wherein said screw member, the ring shaft vertebral fixing spacer according to any one of claims 1 to 6, characterized in, that a self-tap Tsu ping screw having a notch portion on the tip portion.
  8. 【請求項8】 前記ねじ部材の径方向中心部には、該ねじ部材を軸方向に貫通する貫通孔が形成されていること、を特徴とする請求項1から7のいずれかに記載の環軸椎固定用スペーサー。 The radial center portion of wherein said screw member, the ring according to any one of a through hole penetrating the screw member in the axial direction is formed, from claim 1, wherein the 7 Jikushi fixing spacer.
  9. 【請求項9】 前記ねじ部材は、その中心軸に沿った断面において、隣接するねじ山の間が半円形状になるよう構成されていること、を特徴とする請求項1から8のいずれかに記載の環軸椎固定用スペーサー。 Wherein said screw member, in cross-section along its center axis, one of the things that are configured between adjacent threads is semicircular claim 1, wherein 8 ring axis vertebra fixation spacers described.
  10. 【請求項10】 前記ねじ部材はチタン合金製であること、を特徴とする請求項1から9のいずれかに記載の環軸椎固定用スペーサー。 Wherein said screw member is ring shaft vertebral fixing spacer according to any one that is made of a titanium alloy, from claim 1, wherein the 9.
  11. 【請求項11】 前記スペーサーは、前記環椎と前記軸椎を上下方向に挟んで保持するクランプと併用されること、を特徴とする請求項1から10のいずれかに記載の環軸椎固定用スペーサー。 Wherein said spacer ring axis vertebral fixing as claimed in any one of the atlas and the axis vertebral vertically sandwiched therebetween be used with a clamp for holding, claim 1, wherein the 10 use a spacer.
JP8352226A 1996-12-12 1996-12-12 Spacer for atlas and axis fixing Pending JPH10165412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8352226A JPH10165412A (en) 1996-12-12 1996-12-12 Spacer for atlas and axis fixing

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP8352226A JPH10165412A (en) 1996-12-12 1996-12-12 Spacer for atlas and axis fixing
FR9714842A FR2757041A1 (en) 1996-12-12 1997-11-26 Mounting screws for vertebrae atlas and axis
DE1997155369 DE19755369A1 (en) 1996-12-12 1997-12-12 Device for fixing the first and second cervical vertebra
GB9726342A GB2320197A (en) 1996-12-12 1997-12-12 Fixing screw for fixing an atlas and an axis

Publications (1)

Publication Number Publication Date
JPH10165412A true JPH10165412A (en) 1998-06-23

Family

ID=18422623

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8352226A Pending JPH10165412A (en) 1996-12-12 1996-12-12 Spacer for atlas and axis fixing

Country Status (4)

Country Link
JP (1) JPH10165412A (en)
DE (1) DE19755369A1 (en)
FR (1) FR2757041A1 (en)
GB (1) GB2320197A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003038506A (en) * 2001-08-01 2003-02-12 Showa Ika Kohgyo Co Ltd Implant for bone joining implement
JP2003038507A (en) * 2001-08-01 2003-02-12 Showa Ika Kohgyo Co Ltd Implant for bone joining implement
JP2008516694A (en) * 2004-10-15 2008-05-22 バクサノ,インク. Apparatus and methods for tissue removal
JP2009543612A (en) * 2006-07-13 2009-12-10 バクサノ,インク. Check the spinal cord access and nerve whereabouts
US8992621B2 (en) 1996-09-13 2015-03-31 Liliane Attali Expandable osteosynthesis cage
US9314348B2 (en) 2014-06-04 2016-04-19 Wenzel Spine, Inc. Bilaterally expanding intervertebral body fusion device

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US6468309B1 (en) * 2000-10-05 2002-10-22 Cleveland Clinic Foundation Method and apparatus for stabilizing adjacent bones
JP2003325536A (en) * 2002-05-09 2003-11-18 Showa Ika Kohgyo Co Ltd Implant screw
US7828828B2 (en) * 2005-04-14 2010-11-09 Warsaw Orthopedic, Inc Intervertebral joint
CN102860863A (en) * 2011-07-09 2013-01-09 李郁松 Fixing device in atlantoaxial anterior
CN104586546A (en) * 2015-01-21 2015-05-06 王琪 Screwed type fusion apparatus among cervical vertebra zygopophysis joints and supporting cutter of fusion apparatus

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US4950270A (en) * 1989-02-03 1990-08-21 Boehringer Mannheim Corporation Cannulated self-tapping bone screw
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8992621B2 (en) 1996-09-13 2015-03-31 Liliane Attali Expandable osteosynthesis cage
JP2003038506A (en) * 2001-08-01 2003-02-12 Showa Ika Kohgyo Co Ltd Implant for bone joining implement
JP2003038507A (en) * 2001-08-01 2003-02-12 Showa Ika Kohgyo Co Ltd Implant for bone joining implement
JP2008516694A (en) * 2004-10-15 2008-05-22 バクサノ,インク. Apparatus and methods for tissue removal
JP2009543612A (en) * 2006-07-13 2009-12-10 バクサノ,インク. Check the spinal cord access and nerve whereabouts
US9314348B2 (en) 2014-06-04 2016-04-19 Wenzel Spine, Inc. Bilaterally expanding intervertebral body fusion device
US9707095B2 (en) 2014-06-04 2017-07-18 Wenzel Spine, Inc. Bilaterally expanding intervertebral body fusion device
US10098756B2 (en) 2014-06-04 2018-10-16 Wenzel Spine, Inc. Bilaterally expanding intervertebral body fusion device

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GB9726342D0 (en) 1998-02-11
FR2757041A1 (en) 1998-06-19
GB2320197A (en) 1998-06-17
DE19755369A1 (en) 1998-06-18

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