JPH02261446A - Artificial vertebra - Google Patents

Artificial vertebra

Info

Publication number
JPH02261446A
JPH02261446A JP8427489A JP8427489A JPH02261446A JP H02261446 A JPH02261446 A JP H02261446A JP 8427489 A JP8427489 A JP 8427489A JP 8427489 A JP8427489 A JP 8427489A JP H02261446 A JPH02261446 A JP H02261446A
Authority
JP
Japan
Prior art keywords
vertebral body
artificial
length
vertebra
bevel gear
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
JP8427489A
Other languages
Japanese (ja)
Inventor
Nobuo Matsuno
松野　伸男
Hiroyuki Matsui
博之 松井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP8427489A priority Critical patent/JPH02261446A/en
Publication of JPH02261446A publication Critical patent/JPH02261446A/en
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30495—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a locking ring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30518—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements with possibility of relative movement between the prosthetic parts
    • A61F2002/30523—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements with possibility of relative movement between the prosthetic parts by means of meshing gear teeth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/3055—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting length
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30601—Special structural features of bone or joint prostheses not otherwise provided for telescopic
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Neurology (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

PURPOSE:To obtain an artificial vertebra easy to fit and excellent in durability by having a main member and/or an adjust member, whose lengths are arranged adjustable in a longitudinal direction and equipping with fixing parts which are connected to normal vertebrae. CONSTITUTION:Fixing parts which are installed on a main member 9 and/or an adjust member 14 are constituted of a flat plate 12, a projection 13 and/or a flat plate 16, a projection 17. In case of substituting an artificial vertebra for an injured vertebra 2 between two normal vertebrae 1, the injured vertebra 2 and two intervertebral disks 3 situated up and below the injured vertebra 2 are removed, grooves 25 for fitting the projections 13 and 17 of an artificial vertebra are bored in the normal vertebrae 1 remained at both sides. Next, after bone cement 4 is applied into each groove 25, the main member 9 and the adjust member 14, whose total length as the artificial vertebra is made shorter than that of the removed part, is placed between the normal vertebrae 1, the total length of the artificial vertebra is enlarged by turning around a length adjusting ring 19, both projections 13, 17 are made to insert into grooves 25, and finally both flat plates 12, 16 are made to adhere to respective end plates.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、悪性腫瘍等で損なわれた背骨椎体部の代替物
として使用される人工椎体に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an artificial vertebral body used as a substitute for a spinal vertebral body damaged by a malignant tumor or the like.

〈従来の技術〉 近年、を推転穆性悪性腫瘍やけがなどで損なわれた椎体
を、積極的に人工椎体置換することが行われるようにな
ってきた。<Prior Art> In recent years, artificial vertebral body replacements have been actively used to replace vertebral bodies that have been damaged due to malignant tumors or injuries.

従来行なわれてきた方法を第９図ないし第１３図に例示
する。Examples of conventional methods are shown in FIGS. 9 to 13.

第９図は、正常な椎体１が、椎間板３を介して連続して
いるを椎の一部を示すものであるが、椎体の一部が種々
の原因で損なわれた推体２となった場合を説明している
。Figure 9 shows a part of a vertebra where a normal vertebral body 1 is continuous with an intervertebral disc 3, but a part of the vertebral body is damaged due to various reasons and shows a part of the vertebral body 2. It explains what would happen.

第１０図は、損傷を受けた椎体（第９図参照）を除去し
た後、その上下に存在する正常な推体１の中央部に穴を
あけてから、除去した椎体部分と穴にボーンセメント４
を押し込んで充填する方法を示している。　また、第１
１図では、ボーンセメント４を押し込んで充填する際に
ボーンセメント４内に金属棒５をさし込んで補強する方
法を示している。Figure 10 shows that after removing the damaged vertebral body (see Figure 9), a hole is made in the center of the normal body 1 that exists above and below it, and then the removed vertebral body and the hole are inserted. bone cement 4
This shows how to press and fill. Also, the first
FIG. 1 shows a method of reinforcing the bone cement 4 by inserting a metal rod 5 into the bone cement 4 when the bone cement 4 is pushed in and filled.

第１２図は、除去した椎体部分に、適当な長さを持った
セラミック等でできた中空材または棒材６をさし込み、
その内部に、ボーンセメトド４を押し込む方法を示して
いる。　さ　ら　には、第１３図に示すように上下の正
常な椎体に対しボーンスクリュー７をさし込み、さし込
んだボーンスクリュー７間を金属棒８で連結させる方法
などが行なわれている。Figure 12 shows that a hollow member or rod 6 made of ceramic or the like with an appropriate length is inserted into the removed vertebral body.
It shows how to push the bone cement 4 into it. Furthermore, as shown in Figure 13, bone screws 7 are inserted into the upper and lower normal vertebral bodies, and a metal rod 8 is used to connect the inserted bone screws 7. .

〈発明が解決しようとする課題〉 ところが、従来の方法には、下記のような問題があった
。<Problems to be Solved by the Invention> However, the conventional methods have the following problems.

すなわち第１０図に示す方法では、イ）多量のボーンセ
メント４を使用するため固まる時の発熱が大きく、この
ため周囲骨組織が壊死に至る。　口）ボーンセメント４
隼体ではを椎のように大きな力の加わるところでは、強
度的に問題があり、長期使用に耐えられない。That is, in the method shown in FIG. 10, (a) a large amount of bone cement 4 is used, which generates a large amount of heat during hardening, which leads to necrosis of the surrounding bone tissue. mouth) bone cement 4
In the Hayabusa body, there are strength problems in areas where large forces are applied, such as the vertebrae, and it cannot withstand long-term use.

ハ）ボーンセメント４を埋め込んだ後、長さの調整が不
可能である。　二）骨切除量が多いため、出血量が多い
。c) After implanting the bone cement 4, the length cannot be adjusted. 2) There is a large amount of bleeding due to the large amount of bone removed.

第１１図および第１２図に示す方法は、第１０図に示す
方法での、口）強度的に問題があり、長期使用に耐えら
れないという問題を解決するために、椎体除去部に、金
属または、セラミック等の補強材を挿入したものである
が、イ）固まる時の発熱が大きく、周囲骨組織が壊死に
至る。　ハ）埋め込んだ後、長さの調節が不可能である
。　等の問題は解決されておらず、ざらに除去すべき椎
体部分の長さを術前に予測することが難しいため、数種
類の長さのものを術前に予め用意しておく必要があった
。The method shown in FIG. 11 and FIG. 12 is designed to solve the problem that the method shown in FIG. 10 has problems with strength and cannot withstand long-term use. A reinforcing material such as metal or ceramic is inserted, but (a) heat generation is large when it hardens, leading to necrosis of the surrounding bone tissue. C) The length cannot be adjusted after implantation. These problems have not been solved, and it is difficult to predict the length of the vertebral body part that should be roughly removed before surgery, so it is necessary to prepare several different lengths in advance before surgery. Ta.

しかし椎体の大きさは、患者により一人ひとり異なりさ
らに症状によって、骨の摘出量が異なるため適正な長さ
のものを入れることは難しかった。However, the size of the vertebral body differs from patient to patient, and the amount of bone removed varies depending on the patient's symptoms, making it difficult to insert a vertebral body of the appropriate length.

さらに、９１３図に示す方法は、第１０図〜第１２に示
す方法とは全く異なり、椎体の外側から金属棒８を取り
付けて固定する方法であるが、長期の使用により、金属
棒８が破壊しやすいなどの問題があった。Furthermore, the method shown in Fig. 913 is completely different from the method shown in Figs. There were problems such as ease of destruction.

本発明は、上記の問題点を解決するため、長さが可変で
あり、取りつけが容易で、耐久性に優れた人工椎体を提
供することを目的としている。In order to solve the above-mentioned problems, the present invention aims to provide an artificial vertebral body that is variable in length, easy to install, and has excellent durability.

く課題を解決するための手段〉 上記目的を達成するために本発明によれば、損なわれた
椎体の代替とな令人工椎体において、長さ方向に延在し
て、前記長さ方向に長さの調節が可能に設けられた基幹
部材と調節部材とを有し、前記基幹部材および／または
調節部材は正常椎体と接合するための固定部分を有する
ことを特徴とする人工椎体が提供される。Means for Solving the Problems To achieve the above object, the present invention provides an artificial vertebral body that can replace a damaged vertebral body. An artificial vertebral body comprising a base member whose length can be adjusted and an adjustment member, the base member and/or the adjustment member having a fixed portion for joining with a normal vertebral body. is provided.

ここで、前記固定部分が、前記長さ方向に正常椎体側に
延在する突起部を有する平板であるのが好ましい。Here, it is preferable that the fixed portion is a flat plate having a protrusion extending toward the normal vertebral body in the longitudinal direction.

また、前記基幹部材が、長さ方向にわたるねじ部を有す
る中芯部であり、前記調節部材が、該中芯部に嵌挿され
た外筒部と、この外筒部上に設けられ、前記中芯部のね
じ部に螺合する長さ調節リングと、前記長さ調節リング
の長さ方自移動を制限する外筒部上のストッパとを有す
るのが好ましい。Further, the base member is a core portion having a threaded portion extending in the length direction, and the adjustment member is provided on an outer cylinder portion fitted into the center core portion and on the outer cylinder portion, and the adjustment member is provided on the outer cylinder portion and the outer cylinder portion. It is preferable to have a length adjustment ring that is screwed into the threaded part of the central core, and a stopper on the outer cylinder part that limits the longitudinal movement of the length adjustment ring.

前記長さの調節は、中心軸および笠歯車を有するベベル
ギア手段を用いて行ない、前記調節部材の外筒部は前記
ベベルギア手段の中心軸を挿入できる少なくとも１個の
横孔を有し、前記調節部材の調節リングは前記ベベルギ
ア手段の笠歯車に嵌合する歯を有するのが好ましい。The adjustment of the length is performed using bevel gear means having a central shaft and a bevel gear, and the outer cylindrical part of the adjusting member has at least one lateral hole into which the central shaft of the bevel gear means can be inserted; Preferably, the adjustment ring of the member has teeth that engage the bevel gear of said bevel gear means.

前記横孔がねじ付き貫通孔であるのが好ましい。Preferably, the lateral hole is a threaded through hole.

以下に本発明を図面に示す好適実施例に基づいてさらに
詳細に説明する。The present invention will be explained in more detail below based on preferred embodiments shown in the drawings.

第１図〜第３図は、それぞれ本発明の人工椎体の縦断面
図、側断面図および平断面図である。1 to 3 are a longitudinal sectional view, a side sectional view, and a plan sectional view, respectively, of the artificial vertebral body of the present invention.

基幹部材９は、長さ方向にわたるねじ部１０を有する中
芯部１１と、その長さ方向の一端に平°板１２を介して
延設された突起部１３とで構成されている。　前記平板
１２と突起部１３は、正常椎体と接合するための固定部
分となるものである。The base member 9 is composed of a core portion 11 having a threaded portion 10 extending in the length direction, and a projection portion 13 extending from one end of the core portion in the length direction via a flat plate 12. The flat plate 12 and the protrusion 13 serve as a fixed part for joining with a normal vertebral body.

前記中芯部１１の形状は、第３図に示すように扇を２つ
接続した断面形状となっているがこれに限定するもので
はない、　　また、その円弧部分にねじ部１０が設けら
れている。The shape of the central core part 11 is a cross-sectional shape of two connected fans as shown in FIG. There is.

調節部材１４は、長さ方向の中心軸に対して前記中芯部
１１と同軸に設けられた外筒部１５と、その長さ方向の
一端に平板１６を介して延設された突起部１７と、その
長さ方向の他端に設けられ前記ねじ部１０に螺合するね
じ部１８を有し、中芯部１１と同軸的に長さ方向に移動
する長さ調節リング１９と、外筒部１５の好ましくは他
端部に設けられ前記長さ調節リング１９の長さ方向移動
を制限するストッパ２０とで構成されている。　前記平
板１６と突起部１７は、正常椎体と接合するための固定
部分となるものである。The adjustment member 14 includes an outer cylinder part 15 provided coaxially with the central core part 11 with respect to the central axis in the length direction, and a protrusion part 17 extending through a flat plate 16 at one end of the outer cylinder part 15 in the length direction. a length adjusting ring 19 which has a threaded portion 18 provided at the other end in the length direction and is screwed into the threaded portion 10 and moves in the length direction coaxially with the central core portion 11; The stopper 20 is preferably provided at the other end of the portion 15 and limits movement of the length adjustment ring 19 in the length direction. The flat plate 16 and the protrusion 17 serve as a fixed part for joining with a normal vertebral body.

前記外筒部１５は、前記中芯部１１の断面形状に部分的
に外接する断面形状の溝穴を有し、中芯部１１が外筒部
１５の中をスライドして出し入れできるようになってい
る。The outer cylindrical part 15 has a slot having a cross-sectional shape that partially circumscribes the cross-sectional shape of the central core part 11, and the central core part 11 can be slid in and out of the outer cylindrical part 15. ing.

前記長さ調節リング１９は、例えば、動力伝達用のベベ
ルギア手段を用い、第４図に示すように前記ベベルギア
手段の笠歯車２１の回転により、長さ調節リング１９が
回転するようその外周下面に前記笠歯車２１の歯２１ａ
に嵌合する歯１９ａを設けるとともに、前記外筒部１５
に笠歯車２１の中心軸２１ｂを受ける横孔２２を設け、
この横孔２２に笠歯車２１の中心軸２１ｂの先端を嵌合
させて回転させるようにすれば、本発明の人工椎体を生
体内へ埋込み後に作業スペースの極めて狭い生体内で人
工椎体の長さを調節する場合に具合がよい。The length adjusting ring 19 uses, for example, bevel gear means for power transmission, and as shown in FIG. Teeth 21a of the head gear 21
The outer cylinder part 15 is provided with teeth 19a that fit into the outer cylinder part 15.
A horizontal hole 22 is provided to receive the center shaft 21b of the cap gear 21,
If the tip of the center shaft 21b of the cap gear 21 is fitted into this horizontal hole 22 and rotated, the artificial vertebral body of the present invention can be implanted in a living body, and the work space is extremely narrow. Good for adjusting length.

前記ストッパ２０は、前記中芯部１１が長さ調節リング
１９とともに外筒部１５から抜けるのを防止するための
もので、はめ込み式など適宜のものを用いればよい。　
また、前記ベベルギア手段を用いるようにした場合には
、前記ストッパ２０に加えて第５図に示すように外筒部
１５に設けた横孔２２を利用してこれにねじ部を設け、
これに螺合するストッパ２３を取付けることができる。The stopper 20 is for preventing the core portion 11 from coming off the outer cylinder portion 15 together with the length adjustment ring 19, and may be of an appropriate type such as a snap-in type.
Further, when the bevel gear means is used, in addition to the stopper 20, as shown in FIG.
A stopper 23 that screws into this can be attached.

　この場合には、生体の動きにともなう人工椎体へのく
り返しの荷重による長さ調節リング１９のゆるみやがた
つきによる摩耗などが防止できる。In this case, wear due to loosening or rattling of the length adjustment ring 19 due to repeated loads on the artificial vertebral body due to movement of the living body can be prevented.

なお、横孔２２はねじ付き貫通孔の例で説明したが、ね
じをきらなくても貫通孔でなくてもよい。Note that although the horizontal hole 22 has been described as an example of a threaded through hole, it does not need to be a through hole without being threaded.

前記基幹部材９および／または調節部材１４に設けられ
る固定部分は、それぞれ平板１２と突起部１３および／
または平板１６と突起部１７で構成され、各突起部１３
．１７は各平板１２．１６のほぼ中央に設けられて上下
の正常椎体に後述するボーンセメントにより接合される
ようになっている。　これら固定部分のボーンセメント
と接する面には、第６図に示すように表面を粗面化した
り凹部または凸部２４を設けると、ボーンセメントとの
接合強度を向上させることができる。The fixed portions provided on the base member 9 and/or the adjustment member 14 include a flat plate 12, a protrusion 13, and/or a protrusion 13, respectively.
Or it is composed of a flat plate 16 and a protrusion 17, and each protrusion 13
．． 17 is provided approximately at the center of each flat plate 12, 16, and is connected to the upper and lower normal vertebral bodies by bone cement, which will be described later. The bonding strength with the bone cement can be improved by roughening the surface or providing recesses or protrusions 24 as shown in FIG. 6 on the surfaces of these fixed parts that come into contact with the bone cement.

前記本発明の人工椎体を構成する各部材の材買としては
、生体適合性の優れた材料であればよく、特にＴＩ合金
は好ましい。Materials for each member constituting the artificial vertebral body of the present invention may be any material as long as it has excellent biocompatibility, and TI alloy is particularly preferred.

つぎに、本発明の人工椎体を生体内に取り付ける具体例
について説明する。Next, a specific example of attaching the artificial vertebral body of the present invention in a living body will be described.

第７ａ図に示す正常椎体１の間にある損なわれた推体２
に第１図に示す人工椎体を置換する場合には、まず前記
損なわれた椎体２と、その上下に存在する椎間板３を通
常の方法によって除去する（第７ｂ図参照）。Compromised vertebral body 2 between normal vertebral bodies 1 shown in Figure 7a
When replacing the artificial vertebral body shown in FIG. 1, first the damaged vertebral body 2 and the intervertebral discs 3 existing above and below it are removed by a conventional method (see FIG. 7b).

つぎに、前記除去された椎体２およびその上下の椎間板
３の両側に残された正常椎体１に、置換する人工椎体の
突起部１３および１７を装着するための溝２５を穿設す
る（第７Ｃ図参照）、　この溝２５は椎体の周方向およ
び長さ方向に貫通させないよう穿設すると正常椎体１の
強度が損なわれないので好ましい。　また、正常推体端
部のｌａ＠骨（エンドプレート）は摂なわれた推体２と
ともに除去してもよいが、残した方が強度的に好ましい
。Next, grooves 25 are drilled into the normal vertebral body 1 left on both sides of the removed vertebral body 2 and the intervertebral discs 3 above and below it to attach the protrusions 13 and 17 of the artificial vertebral body to be replaced. (See FIG. 7C) It is preferable to drill this groove 25 so that it does not penetrate in the circumferential and longitudinal directions of the vertebral body, so that the strength of the normal vertebral body 1 is not impaired. Further, the bone (end plate) at the end of the normal body may be removed together with the ingested body 2, but it is preferable to leave it in terms of strength.

つぎに、穿設された前記各溝２５ヘボーンセメント４を
挿入したのち（第７ｄ図参照）、基幹部材９と調節部材
１４を第１図に示すように不良椎体除去長さよりも人工
椎体の長さを短くして第７ｅ図に示すように位置させ、
長さ調節リング１９を廻しながら人工椎体の全長を伸長
させ両突起部１３．１７をそれぞれ前記両溝２５へ挿入
していく（第７ｅ図参照）。　なお、溝２５へ挿入する
前に、予め突起部１３．１７の表面および平板１２．１
６の突起部側表面にそれぞれボーンセメント４を塗布し
ておくとよい、　前記ボーンセメントを塗布する各部分
を予め粗面化し、または前記部分に凹部あるいは凸部を
設けておくと、接合強度を向上できる。Next, after inserting the bone cement 4 into each of the drilled grooves 25 (see Figure 7d), the base member 9 and the adjustment member 14 are adjusted to the length of the defective vertebral body removed, as shown in Figure 1. Shorten the length of the body and position it as shown in Figure 7e,
While turning the length adjustment ring 19, the entire length of the artificial vertebral body is extended, and both protrusions 13, 17 are inserted into the grooves 25, respectively (see Fig. 7e). Note that before inserting into the groove 25, the surface of the protrusion 13.17 and the flat plate 12.1 are
Bone cement 4 is preferably applied to each of the protrusion side surfaces of 6. If each part to which the bone cement is applied is roughened in advance, or if a concave or convex part is provided in the part, the bonding strength can be increased. You can improve.

最後に、長さ調節リング１９を廻しつづけて両手板１２
．１６が各エンドプレートに密着するようにして人工椎
体の装着を完了する（第７ｆ図参照）。Finally, continue turning the length adjustment ring 19 until the both hand plates 12
．． The installation of the artificial vertebral body is completed so that the artificial vertebral body 16 is brought into close contact with each end plate (see Fig. 7f).

なお、人工椎体の伸縮は上述した調節リングの手動ある
いはベベルギア手段で行えばよい。Note that the artificial vertebral body may be expanded or contracted manually using the above-mentioned adjustment ring or by bevel gear means.

人工椎体の固定は調節部材の外筒部に横孔を設けこれに
ストッパを取付ければより確実になる。Fixation of the artificial vertebral body will be made more reliable if a lateral hole is provided in the outer cylindrical portion of the adjustment member and a stopper is attached to the lateral hole.

上記社よりて固定される本発明の人工椎体は、従来のも
のに比べ垂直荷重およびねじり荷重が同等以上であり高
度の耐久性を有している。The artificial vertebral body of the present invention fixed by the above-mentioned company has a vertical load and torsional load equal to or higher than conventional ones, and has a high degree of durability.

〈実施例〉 以下に本発明を実施例に基づき具体的に説明する。<Example> The present invention will be specifically explained below based on Examples.

大男体骨のを椎を実測し、椎体と椎間板の大きさを調査
した。　この結果に基づき、Ｈａ用、胸腰椎用、頚胸推
用、類推用の４ｆｆＩの人工椎体を作製した。The vertebrae of the large man's bones were actually measured, and the sizes of the vertebral bodies and intervertebral discs were investigated. Based on this result, 4ffI artificial vertebral bodies for Ha, thoracolumbar, cervicothoracic, and analogous were fabricated.

素材として生体適合性に優れたＴ　Ｌ−６ＡＩＬ−４Ｖ
合金を用い、第８図に示す■：長さ調節範囲、■：突起
部長さ、■：平板の大きさをそれぞれ表−１のとおりと
したほかは第４図に示す形状とした。T L-6AIL-4V has excellent biocompatibility as a material
An alloy was used, and the shape shown in FIG. 4 was made except that the following values were set as shown in Table 1: (1): Length adjustment range, (2): Projection length, (2): Flat plate size as shown in Table 1.

ボーンセメントと接する面は格子状に溝を設けた。Grooves were provided in a grid pattern on the surface in contact with the bone cement.

つぎに、これらの人工椎体を生理食塩水中で垂直荷重３
００ｋｇｆでｌＸｌ０’サイクルの疲労試験を行なりた
が、いずれも破壊−につながるような損傷は認められな
かった。Next, these artificial vertebral bodies were subjected to a vertical load of 3 in physiological saline.
A fatigue test of 1X10' cycles was conducted at 00 kgf, but no damage leading to destruction was observed in either case.

また、同様に生理食塩水中で、２ｋｇｆ−ｍのねじりモ
ーメントを加えて疲労試験を行なったが、やはり損傷は
認められなかった。　実際の生体内で人工椎体にかかる
荷重として垂直荷重３００ｋｇｆ、ねじりモーメント２
ｋｇｆ−ｍはほとんどあり得ない大きな値であり、この
ことから強度は十分あることが立証された。Further, a fatigue test was similarly conducted in physiological saline by applying a torsion moment of 2 kgf-m, but no damage was observed. The load applied to the artificial vertebral body in an actual living body is a vertical load of 300 kgf and a torsional moment of 2.
kgf-m is an almost impossible large value, which proves that the strength is sufficient.

また、これらの人工椎体は固体差によらず損なわれた椎
体の代替として長さを調節するだけで適合できた。In addition, these artificial vertebral bodies could be adapted to replace damaged vertebral bodies by simply adjusting their length, regardless of individual differences.

表−１ （単位：　ｍｍ） 〈発明の効果〉 本発明は、以上説明したように構成されているので、従
来の椎体置換術と比較し手術手段が簡単で骨との固定力
に優れ、かつ椎体への埋込み前、後においても、その長
さの調節が可能であり、椎体傷害に悩む患者の救済に役
立つこと大である。Table 1 (Unit: mm) <Effects of the Invention> Since the present invention is configured as described above, the surgical method is simpler and the fixation force with the bone is superior compared to conventional vertebral body replacement surgery. Moreover, its length can be adjusted before and after implantation into the vertebral body, which is of great help to patients suffering from vertebral body injuries.

また、本発明の人工椎体は、長さ調節範囲、突起部長さ
および平板の大籾さを変化させるだけで腰椎用、胸腰椎
用、頚胸椎用および頚椎用の人工椎体とすることができ
る。Furthermore, the artificial vertebral body of the present invention can be used as an artificial vertebral body for lumbar vertebrae, thoracolumbar vertebrae, cervicothoracic vertebrae, and cervical vertebrae by simply changing the length adjustment range, the length of the protrusion, and the grain size of the flat plate. can.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、本発明の人工椎体の縦断面図である。 第２図および第３図は、それぞれ第１図のＩＩ　−ＩＩ
線およびＩＩＩ　−ｒ■線断面図である。 第４図は、ベベルギヤ機構取り付けた部分の説明図であ
る。 第５図は、他のストッパを取り付けた部分の説明図であ
る。 第６図は、ボーンセメントと接する面に凸部を設けた図
である。 第７ａ図〜第７ｆ図は、人工椎体の取り付は工程の説明
図である。 第８図は、入用人工椎体４種の各寸法の位置を示す図で
ある。 第９図は、正常椎体と損なわれた椎体との関係を示す図
である。 第１０図〜第１３図は、それぞれ従来の人工椎体置換例
を示す図である。 符号の説明 １・・・正常椎体、 ２・・・損なわれた椎体、 ３・・・椎間板、 ４・・・ボーンセメント、 ５・・・金属棒、 ６・・・中空材または溝材、 ７・・・ボーンスクリュー ８・・・金属棒、 ９・・・基幹部材、 １０・・・ねじ部、 １１・・・中芯部、 １２・・・平板、 １３・・・突起部、 １４・・・調節部材、 １５・・・外筒部、 １６・・・平板、 １７・・・突起部、 １８・・・ねじ部、 １９・・・長さ調節リング、 ９　ａ・・・歯、 Ｏ・・・ストッパ、 １・・・ベベルギア手段の笠歯車、 １ａ・・・歯、 １ｂ・・・中心軸、 ２・・・横孔、 ３・・・ストッパ、 ４・・・凹部または凸部、 ５・・・溝 ＦＩＧ Ｆ　Ｉ　Ｇ、　２ ■二 Ｆ　Ｉ　Ｇ、　３ ↑ 看 會 ＦＩＧ、４ Ｆ　Ｉ　Ｇ、　６ ＦＩＧ、９ Ｆ　Ｉ　Ｇ、１０ ＦＩＧ Ｆ　Ｉ　Ｇ、　１２ Ｆ　Ｉ　Ｇ、　１３FIG. 1 is a longitudinal sectional view of the artificial vertebral body of the present invention. Figures 2 and 3 are II-II of Figure 1, respectively.
FIG. FIG. 4 is an explanatory diagram of the part to which the bevel gear mechanism is attached. FIG. 5 is an explanatory diagram of a portion where another stopper is attached. FIG. 6 is a diagram in which a convex portion is provided on the surface in contact with bone cement. Figures 7a to 7f are explanatory diagrams of the installation process of the artificial vertebral body. FIG. 8 is a diagram showing the position of each dimension of four types of artificial vertebral bodies in use. FIG. 9 is a diagram showing the relationship between a normal vertebral body and a damaged vertebral body. FIGS. 10 to 13 are diagrams showing conventional artificial vertebral body replacement examples, respectively. Explanation of symbols 1...Normal vertebral body, 2...Damaged vertebral body, 3...Intervertebral disc, 4...Bone cement, 5...Metal rod, 6...Hollow material or groove material , 7... Bone screw 8... Metal rod, 9... Base member, 10... Threaded part, 11... Central core part, 12... Flat plate, 13... Projection part, 14 ...Adjustment member, 15...Outer cylinder part, 16...Flat plate, 17...Protrusion part, 18...Threaded part, 19...Length adjustment ring, 9a...Teeth, O...stopper, 1...shade gear of bevel gear means, 1a...teeth, 1b...center shaft, 2...horizontal hole, 3...stopper, 4...recess or convex part , 5...Groove FIG F I G, 2 ■Two F I G, 3 ↑ Care FIG, 4 F I G, 6 FIG, 9 F I G, 10 FIG F I G, 12 F I G, 13

Claims (5)

【特許請求の範囲】[Claims] （１）　損なわれた椎体の代替となる人工椎体において
、長さ方向に延在して、前記長さ方向に長さの調節が可
能に設けられた基幹部材と調節部材とを有し、前記基幹
部材および／または調節部材は正常椎体と接合するため
の固定部分を有することを特徴とする人工椎体。(1) An artificial vertebral body that replaces a damaged vertebral body includes a base member and an adjustment member that extend in the length direction and are provided so that the length can be adjusted in the length direction. . An artificial vertebral body, wherein the base member and/or the adjustment member have a fixed portion for joining with a normal vertebral body. （２）　前記固定部分が、前記長さ方向に正常椎体側に
延在する突起部を有する平板である請求項１記載の人工
椎体。(2) The artificial vertebral body according to claim 1, wherein the fixed portion is a flat plate having a protrusion extending toward the normal vertebral body in the longitudinal direction. （３）　前記基幹部材が、長さ方向にわたるねじ部を有
する中芯部であり、前記調節部材が、該中芯部に嵌挿さ
れた外筒部と、この外筒部上に設けられ、前記中芯部の
ねじ部に螺合する長さ調節リングと、前記長さ調節リン
グの長さ方向移動を制限する外筒部上のストッパとを有
する請求項１または２記載の人工椎体。(3) The base member is a core portion having a threaded portion extending in the length direction, and the adjustment member is provided on an outer cylindrical portion fitted into the central core portion and on the outer cylindrical portion, The artificial vertebral body according to claim 1 or 2, comprising a length adjustment ring that is screwed into the threaded portion of the central core portion, and a stopper on an outer cylinder portion that limits longitudinal movement of the length adjustment ring. （４）　前記長さの調節は、中心軸および笠歯車を有す
るベベルギア手段を用いて行ない、前記調節部材の外筒
部は前記ベベルギア手段の中心軸を挿入できる少なくと
も１個の横孔を有し、前記調節部材の調節リングは前記
ベベルギア手段の笠歯車に嵌合する歯を有する請求項３
記載の人工椎体。(4) The length adjustment is performed using bevel gear means having a central shaft and a bevel gear, and the outer cylindrical portion of the adjusting member has at least one horizontal hole into which the central shaft of the bevel gear means can be inserted. 3. The adjusting ring of the adjusting member has teeth that fit into the bevel gear of the bevel gear means.
Artificial vertebral body described. （５）　前記横孔がねじ付き貫通孔である請求項４記載
の人工椎体。(5) The artificial vertebral body according to claim 4, wherein the lateral hole is a threaded through hole.
JP8427489A 1989-04-03 1989-04-03 Artificial vertebra Pending JPH02261446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8427489A JPH02261446A (en) 1989-04-03 1989-04-03 Artificial vertebra

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8427489A JPH02261446A (en) 1989-04-03 1989-04-03 Artificial vertebra

Publications (1)

Publication Number Publication Date
JPH02261446A true JPH02261446A (en) 1990-10-24

Family

ID=13825877

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8427489A Pending JPH02261446A (en) 1989-04-03 1989-04-03 Artificial vertebra

Country Status (1)

Country Link
JP (1) JPH02261446A (en)

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US7204852B2 (en) 2002-12-13 2007-04-17 Spine Solutions, Inc. Intervertebral implant, insertion tool and method of inserting same
EP1871307A2 (en) * 2005-04-21 2008-01-02 Globus Medical, Inc. Expandable vertebral prosthesis
JP2009106744A (en) * 2007-10-30 2009-05-21 Kilian Kraus Height-adjustable vertebral column implant
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US7648529B2 (en) 1999-09-02 2010-01-19 Stryker Spine Telescoping spinal implant
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US8066774B2 (en) 2006-04-07 2011-11-29 Warsaw Orthopedic, Inc. Artificial disc implants and associated methods and instrumentation
US8876836B2 (en) 1999-09-14 2014-11-04 DePuy Synthes Products, LLC Insertion instrument for an intervertebral implant
US9192481B2 (en) 2005-04-21 2015-11-24 Globus Medical, Inc. Expandable vertebral prosthesis
US9254139B2 (en) 2006-07-31 2016-02-09 DePuy Synthes Products, Inc. Drilling/milling guide and keel cut preparation system
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