JP3675669B2 - Rod pair spacing adjustment device - Google Patents

Rod pair spacing adjustment device Download PDF

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Publication number
JP3675669B2
JP3675669B2 JP14151199A JP14151199A JP3675669B2 JP 3675669 B2 JP3675669 B2 JP 3675669B2 JP 14151199 A JP14151199 A JP 14151199A JP 14151199 A JP14151199 A JP 14151199A JP 3675669 B2 JP3675669 B2 JP 3675669B2
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JP
Japan
Prior art keywords
rod
shaft
rod receiving
distance
rods
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Expired - Fee Related
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JP14151199A
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Japanese (ja)
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JP2000325373A (en
Inventor
英雄 一青
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Robert Reid Inc
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Robert Reid Inc
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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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
    • A61B17/7052—Connectors, not bearing on the vertebrae, for linking longitudinal elements together of variable angle or length

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Surgical Instruments (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、複数のインプラント列に取り付けられたロッド対の間隔調整のための装置に関するものである。
【０００２】
【従来の技術】
並行するロッドを連結するための装置は公知である。この装置には幾つかのタイプがあり、先行技術として特公平５−４０５８０号、特許第２５５４８５３号等の発明を示すことができる。これらの従来の連結装置に共通することは、どれも構成が複雑で取り扱いが面倒であり、目的箇所へ挿入しにくい点であった。
【０００３】
【発明が解決しようとする課題】
本発明は前記の点に着目してなされたものであり、その課題は小型で取り扱い易い、ロッド対の間隔調整装置を提供することにある。
【０００４】
【課題を解決するための手段】
前記課題を解決する本発明は、一方のロッドに取り付けるロッド受け部を一端に有し、かつ調整のために切断可能な軸状部分をロッド受け部以外の箇所に有する第１部材と、他の一方のロッドに取り付けるロッド受け部を一端に有し、上記軸状部分を隙き間なく差し込める空所を持ち、この空所内で軸状部分を抜き差しする延伸部分を有する第２部材と、上記空所に差し込んだ軸状部分を締め付けて固定するねじ手段とを具備し、ロッド対の間隔調整のために、軸状部分を適当な長さに切断の上、上記空所に差し込みねじ手段により固定可能とし、ロッド受け部はほぼＣ字型の断面形状を有するとともに、ロッド受け部の後方に軸状部分が延びるものとし、その底面はロッド受け部の先端よりも下方に位置してロッドを引っ掛けるように保持可能とし、ロッドと第１部材又は第２部材のねじ止め部、及び第１、第２両部材のねじ止め手段の各めねじ部は肥大部に形成するという手段を講じたものである。
【０００５】
【発明の実施の形態】
本発明に係るロッド対の間隔調整装置は、複数のインプラント列に取り付けられたロッド対の間隔調整のための装置である。インプラントは例えば椎体等脊柱構成体に植設され、それらの配列を所望の状態に保つためにロッドに結合され、また本装置でロッド間隔が調整される。
【０００６】
本装置は、並行するロッド対の一方に取り付ける第１部材と、他の一方に取り付ける第２部材及び第１、第２両部材の締結のためのねじ手段とを具備する。図１参照。
【０００７】
第１部材は、ロッドの取り付けのためのロッド受け部を一端に有する。このロッド受け部は、例えばＣ字型のようにロッドにその側面から接近可能な形状、構造を有するものであることが望ましい。第１部材をロッドに取り付けるために、止めねじによりロッドとロッド受け部とを結合する。第１部材は、またロッド受け部の後方へ延びる軸状部分を有する。軸状部分は、ロッド間の間隔調整のために必要な場合、切断を予定して形成される。
【０００８】
第２部材は、第１部材と同様のロッド受け部を一端に有する。第２部材とロッドとの取り付けも、第１部材の場合と同様に止めねじによる結合で良い。第２部材はそのロッド受け部の後方へ延びる延伸部分を有し、延伸部分は、第１部材の軸状部分を隙き間なく差し込めるような空所を持つ。この空所内で軸状部分を抜き差しすることにより、第１、第２両部材の全長をロッド間隔に合わせることができる。図２参照。
【０００９】
第１、第２両部材を締結するねじ手段は、上記空所に差し込んだ軸状部分を締め付けて、動かないように固定する。ねじ手段として、十分強力な締め付けを実現するために、おねじ長さに近い長さをもつめねじを第２部材側に設けることが望ましい。このめねじ形成のために第２部材には肥大部を設けることができる。
【００１０】
【実施例】
以下図面を参照して本発明をより詳細に説明する。例示のロッド１０、１０′は中実の丸棒状のものとして示されている。
【００１１】
第１部材１１のロッド受け部１２はほぼＣ字型の断面形状を有し、一方のロッド１０の外面と面接触可能なロッド受け面１３を内面に有し、さらに同受け面１３に対してロッド１０を加圧する位置にて止めねじ１４をロッド１０に当接させるめねじ部１５を有する。ロッド受け面１３の底面はロッド受け部１２の先端１６よりも下方に位置し、ねじ止め状態ではロッド１０を引っ掛けるように保持して抜け出しを防いでいる。図３参照。
【００１２】
ロッド受け部１２は強固に形成され、特にめねじ部１５を設けた部分は軸状部分１７と同程度かそれ以上の厚みを持った肥大部とされている。軸状部分１７は一様な長さの中実軸状構造を持ち、かつ切断可能な太さを有するが、長短何種類かが予め用意される。なお、短いものには同じ符号にダッシュを付して示す（図１）。
【００１３】
第２部材２１の場合も、ロッド受け部２２は第１部材１１のそれと同様の構成で良い。他の一方のロッド１０′はその受け面２３に面接触可能とされ、めねじ部２５に螺合した止めねじ２４によって締め付けられる。また先端２６はロッド受け面２３の底面よりも上方に位置する。
【００１４】
第２部材２１の延伸部分２７は、第１部材１１の軸状部分１７を密に差し込める空所２８を持った筒状に形成されている。嵌合が密なほどねじ手段３０による固定力が有効に作用する。この点止めねじ１４、２４によるロッド１０、１０′の固定の場合も同様である。
【００１５】
上記ねじ手段３０は、空所２８に差し込まれた軸状部分１７を締め付け第１、第２両部材１１、２１を締結するために具備される。ねじ手段３０として、おねじ体３１と、その長さに近い長さを持つめねじ部３２が適用される。このめねじ部３２のために第２部材２１の後方端部には肥大部３３が設けられ、十分な強度を提供している。他のめねじ部１５、２５も止めねじ１４、２４とほぼ同等の長さを有する。
【００１６】
脊柱の椎体Ｖにはインプラント３４が植設され、その列にロッド１０、１０′が夫々取り付けられるが、そのロッド対１０、１０′にはしばしば間隔を調整する必要が生ずる。ロッド間隔を拡げる調整が最も多いケースであるが、その場合には器具を用いてロッド間隔を拡大し、そこへ本装置３５を挿入して第１部材１１を一方のロッドに、また第２部材２１を他の一方のロッドに嵌め合わせる。このとき、各ねじ１４、２４、３１は緩めておき、装置全長は短か目の状態から伸ばすようにする。第１、第２両部材１１、２１のロッド受け部１２、２２が各ロッド１０、１０′に正しく嵌合し、ロッド間隔が決定したならば各ねじ１４、２４、３１を締め付けて作業を終える。ロッド保持部１６、２６は、ロッド１０、１０′を引っ掛けて止める形状構造を有するので、ロッド間隔の減少も上記と逆方向の修整により実施可能である。
【００１７】
【発明の効果】
本発明は以上の如く構成されかつ作用するものであるから、第１、第２の２点の部材と３個の止めねじといった最少の点数によって構成可能であり、かつ形態も非常にコンパクトなものとなり、小型で最もシンプルなロッド対の間隔調整装置を提供することができるという効果を奏する。
【図面の簡単な説明】
【図１】本発明に係るロッド対の間隔調整装置の１実施例を示す分解斜視図。
【図２】同上装置の上面図。
【図３】同じく縦断面図。
【図４】使用状態を示す説明図。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for adjusting the distance between a pair of rods attached to a plurality of implant rows.
[0002]
[Prior art]
Devices for connecting parallel rods are known. There are several types of this apparatus, and inventions such as Japanese Patent Publication No. 5-40580 and Japanese Patent No. 2554853 can be shown as prior art. What is common to these conventional coupling devices is that the configuration is complicated and the handling is troublesome, and it is difficult to insert into the target location.
[0003]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above points, and an object thereof is to provide a rod pair spacing adjusting device that is small and easy to handle.
[0004]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problems has a first member having a rod receiving part attached to one rod at one end and a shaft-shaped part that can be cut for adjustment at a place other than the rod receiving part, having a rod-receiving portion for mounting on one of the rods at one end, Chi lifting the cavity to plug rather between-out gap of the shaft-like portion, and a second member having a drawing portion for connecting or disconnecting the shaft-like portion in this cavity, Screw means for tightening and fixing the shaft-shaped portion inserted into the space, and cutting the shaft-shaped portion into an appropriate length for adjusting the distance between the rod pairs; The rod receiving portion has a substantially C-shaped cross section, and the shaft-like portion extends behind the rod receiving portion , and its bottom surface is located below the tip of the rod receiving portion. held in so that hook the rod And ability screwed portion of the rod and the first member or the second member, and first, the internal thread portion of the screwing means of the second both members is obtained by taking steps of forming the enlarged portion.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The rod pair distance adjusting device according to the present invention is a device for adjusting the distance between rod pairs attached to a plurality of implant rows. Implants are implanted in spinal structures such as, for example, vertebral bodies, coupled to rods to maintain their alignment in a desired state, and rod spacing is adjusted with the device.
[0006]
The apparatus includes a first member attached to one of the parallel rod pairs, a second member attached to the other one, and screw means for fastening both the first and second members. See FIG.
[0007]
The first member has a rod receiving portion for attaching the rod at one end. It is desirable that the rod receiving portion has a shape and a structure that can be accessed from the side of the rod, for example, like a C-shape. In order to attach the first member to the rod, the rod and the rod receiving portion are coupled by a set screw. The first member also has an axial portion that extends rearward of the rod receiving portion. The shaft-like portion is formed by cutting when necessary for adjusting the distance between the rods.
[0008]
The second member has a rod receiving portion similar to the first member at one end. The attachment of the second member and the rod may be performed by a set screw as in the case of the first member. The second member has an extending portion extending rearward of the rod receiving portion, and the extending portion has a space in which the shaft-like portion of the first member can be inserted without gaps. By inserting and removing the shaft-like portion in this space, the total length of both the first and second members can be adjusted to the rod interval. See FIG.
[0009]
The screw means for fastening both the first and second members fastens the shaft-like portion inserted into the space so as not to move. As the screw means, in order to realize sufficiently strong tightening, it is desirable to provide a female screw having a length close to the male screw length on the second member side. An enlarged portion can be provided in the second member for forming the female screw.
[0010]
【Example】
Hereinafter, the present invention will be described in more detail with reference to the drawings. The exemplary rod 10, 10 'is shown as a solid round bar.
[0011]
The rod receiving portion 12 of the first member 11 has a substantially C-shaped cross-sectional shape, and has a rod receiving surface 13 that can come into surface contact with the outer surface of one of the rods 10. A female screw portion 15 is provided for abutting the set screw 14 against the rod 10 at a position where the rod 10 is pressurized. The bottom surface of the rod receiving surface 13 is located below the tip 16 of the rod receiving portion 12, and in the screwed state, the rod 10 is held so as to be hooked to prevent the rod receiving surface 13 from coming out. See FIG.
[0012]
The rod receiving portion 12 is firmly formed, and in particular, the portion provided with the female screw portion 15 is an enlarged portion having a thickness comparable to or greater than that of the shaft-like portion 17. The shaft-like portion 17 has a solid shaft-like structure with a uniform length and has a thickness that can be cut, but several types of lengths are prepared in advance. In addition, a short thing attaches | subjects a dash to the same code | symbol (FIG. 1).
[0013]
Also in the case of the second member 21, the rod receiving portion 22 may have the same configuration as that of the first member 11. Other one of the rod 10 'is a surface contactable with the receiving surface 23, is clamped by a set screw 24 screwed into the internal thread portion 25. The tip 26 is located above side than the bottom of the rod receiving surface 23.
[0014]
The extending portion 27 of the second member 21 is formed in a cylindrical shape having a space 28 into which the shaft-like portion 17 of the first member 11 can be inserted. The tighter the fitting, the more effectively the fixing force by the screw means 30 acts. The same applies to the case where the rods 10, 10 'are fixed by the point set screws 14, 24.
[0015]
The screw means 30 is provided to fasten the first and second members 11 and 21 by tightening the shaft-like portion 17 inserted into the space 28. As the screw means 30, a male screw body 31 and a female screw portion 32 having a length close to the length are applied. An enlarged portion 33 is provided at the rear end portion of the second member 21 for the female screw portion 32 to provide sufficient strength. The other female screw portions 15 and 25 have substantially the same length as the set screws 14 and 24.
[0016]
An implant 34 is implanted in the vertebral body V of the spinal column, and rods 10 and 10 'are respectively attached to the row. However, it is often necessary to adjust the distance between the rod pairs 10 and 10'. In this case, the rod spacing is increased by using an instrument, the device 35 is inserted into the rod 35, and the first member 11 is inserted into one rod and the second member. Fit 21 to the other rod. At this time, the screws 14, 24 and 31 are loosened so that the overall length of the apparatus is extended from a short state. When the rod receiving portions 12 and 22 of both the first and second members 11 and 21 are correctly fitted to the rods 10 and 10 'and the rod interval is determined, the screws 14, 24 and 31 are tightened to finish the operation. . Since the rod holding portions 16 and 26 have a shape structure for hooking and stopping the rods 10 and 10 ', the rod interval can be reduced by modification in the reverse direction.
[0017]
【The invention's effect】
Since the present invention is configured and operates as described above, it can be configured with a minimum number of points such as first and second members and three set screws, and the configuration is very compact. Thus, there is an effect that it is possible to provide a small and simplest rod pair distance adjusting device.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a distance adjusting device for rod pairs according to the present invention.
FIG. 2 is a top view of the apparatus.
FIG. 3 is a longitudinal sectional view.
FIG. 4 is an explanatory diagram showing a use state.

Claims (1)

複数のインプラント列に取り付けられたロッド対の間隔調整のための装置であって、一方のロッドに取り付けるロッド受け部を一端に有し、かつ調整のために切断可能な軸状部分をロッド受け部以外の箇所に有する第１部材と、他の一方のロッドに取り付けるロッド受け部を一端に有し、上記軸状部分を隙き間なく差し込める空所を持ち、この空所内で軸状部分を抜き差しする延伸部分を有する第２部材と、上記空所に差し込んだ軸状部分を締め付けて固定するねじ手段とを具備し、ロッド対の間隔調整のために、軸状部分を適当な長さに切断の上、上記空所に差し込みねじ手段により固定可能とし、ロッド受け部はほぼＣ字型の断面形状を有するとともに、ロッド受け部の後方に軸状部分が延びるものとし、その底面はロッド受け部の先端よりも下方に位置してロッドを引っ掛けるように保持可能とし、ロッドと第１部材又は第２部材のねじ止め部、及び第１、第２両部材のねじ止め手段の各めねじ部は肥大部に形成したことを特徴とするロッド対の間隔調整装置。A device for adjusting the distance between a pair of rods attached to a plurality of implant rows, having a rod receiving part attached to one rod at one end, and a rod-shaped part that can be cut for adjustment as a rod receiving part a first member having a portion other than has at one end a rod receiving portion attached to the other one of the rods, Chi lifting the cavity to plug rather between-out gap of the shaft-like portion, shaft-like part of this cavity A second member having an extending portion for inserting / removing the shaft and screw means for fastening and fixing the shaft-shaped portion inserted into the space, and for adjusting the distance between the rod pairs, the shaft-shaped portion has an appropriate length. The rod receiving portion has a substantially C-shaped cross section, and a shaft-like portion extends behind the rod receiving portion , and its bottom surface is Tip of rod receiver And can be held in so that hooking rod positioned remote downwardly, screwing portion of the rod and the first member or the second member, and first, the internal thread portion of the screwing means of the second both members hypertrophy An apparatus for adjusting the distance between rod pairs, characterized in that the rod pair is formed in a portion.
JP14151199A 1999-05-21 1999-05-21 Rod pair spacing adjustment device Expired - Fee Related JP3675669B2 (en)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7942901B2 (en) * 2006-04-24 2011-05-17 Warsaw Orthopedic, Inc. Connector apparatus
US9649136B2 (en) * 2011-07-15 2017-05-16 Globus Medical, Inc. Coupling devices and methods of using the same

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659225B1 (en) * 1990-03-08 1995-09-08 Sofamor TRANSVERSE FIXING DEVICE FOR PROVIDING A RIGID CROSS-LINK BETWEEN TWO RODS OF A SPINAL OSTEOSYNTHESIS SYSTEM.
US5360431A (en) * 1990-04-26 1994-11-01 Cross Medical Products Transpedicular screw system and method of use
US5312405A (en) * 1992-07-06 1994-05-17 Zimmer, Inc. Spinal rod coupler
US5275600A (en) * 1992-10-05 1994-01-04 Zimmer, Inc. Telescoping rod to rod coupler for a spinal system
US5522816A (en) * 1994-03-09 1996-06-04 Acromed Corporation Transverse connection for spinal column corrective devices
US5601552A (en) * 1994-03-18 1997-02-11 Sofamor, S.N.C. Fixing device for a rigid transverse connection device between rods of a spinal osteosynthesis system
US5498263A (en) * 1994-06-28 1996-03-12 Acromed Corporation Transverse connector for spinal column corrective devices
US5688272A (en) * 1995-03-30 1997-11-18 Danek Medical, Inc. Top-tightening transverse connector for a spinal fixation system
US5630816A (en) * 1995-05-01 1997-05-20 Kambin; Parviz Double barrel spinal fixation system and method
US5667507A (en) * 1995-12-04 1997-09-16 Fastenetix, Llc Compression locking variable length cross-link device for use with dual rod apparatus
FR2763832B1 (en) * 1997-05-29 1999-10-01 Materiel Orthopedique En Abreg VERTEBRAL ROD FOR INSTRUMENTATION OF RACHIDIAN OSTEOSYNTHESIS, AND OSTEOSYNTHESIS INSTRUMENTATION COMPRISING SUCH ROD

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