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JPH0751292A - Bone screw left in bone - Google Patents

Bone screw left in bone

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Publication number
JPH0751292A
JPH0751292AJP5234353AJP23435393AJPH0751292AJP H0751292 AJPH0751292 AJP H0751292AJP 5234353 AJP5234353 AJP 5234353AJP 23435393 AJP23435393 AJP 23435393AJP H0751292 AJPH0751292 AJP H0751292A
Authority
JP
Japan
Prior art keywords
bone
screw
bone cement
lumen
cement
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
JP5234353A
Other languages
Japanese (ja)
Inventor
Yoshihiro Kishigami
義弘 岸上
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.)
Individual
Original Assignee
Individual
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 IndividualfiledCriticalIndividual
Priority to JP5234353ApriorityCriticalpatent/JPH0751292A/en
Publication of JPH0751292ApublicationCriticalpatent/JPH0751292A/en
Pendinglegal-statusCriticalCurrent

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Abstract

PURPOSE:To provide a bone screw left in the bone which can be left permanently in the bone by utilizing an organism-activating bone cement in order to prevent the loosening of the bone screw. CONSTITUTION:In a bone screw provided with a thread ridge to a tube form or a cul-de-sac form screw main body, holes 2 with the size to exhaust a bone cement paste are formed to the tube wall of the main body at adequate intervals.

Description

Translated fromJapanese
【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、骨に捻込んだ骨ネジ
が弛まないようにするため、ペースト状の生体活性型骨
セメントを接着剤代わりに利用して、骨と骨ネジとを結
合させるようにした、骨内留置用骨ネジに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a paste-like bioactive bone cement as an adhesive to bond a bone and a bone screw in order to prevent the bone screw screwed into the bone from loosening. The present invention relates to an intraosseous indwelling bone screw.

【0002】[0002]

【従来の技術】骨の治療に用いる骨ネジは、用途によっ
て多種多様の形や構造をしているが、基本的には、円柱
形をした「本体」の一端に捻込み工具を挿入するための
腔所をもつ「ネジ頭」と他端に骨を切るための尖った
「ネジ先」を備え、ネジ頭とネジ先との間の本体全周
や、ネジ先付近の一部に螺旋状の「ネジ山」が形成され
ているものである。
2. Description of the Related Art Bone screws used for treating bones have various shapes and structures depending on their use. Basically, a screw tool is inserted into one end of a cylindrical "main body". It has a "screw head" with a cavity and a sharp "screw tip" for cutting bones at the other end, and it has a spiral shape around the entire body between the screw head and the screw tip, or a part near the screw tip. "Thread" is formed.

【0003】[0003]

【発明が解決しようとする課題】骨に捻入れるという機
能を果たすために、どの骨ネジも本体外側の断面が正円
形になっている。これによって円滑に骨への捻込みが進
行するわけであるが、その半面、振動などによって弛み
やすいという宿命的な大欠点があった。従来の技術で
は、この欠点が未だに解決されていない。
In order to perform the function of screwing into a bone, each bone screw has a circular cross section outside the main body. This allows the screw to be smoothly screwed in, but on the other hand, it has a fatal major drawback that it is easily loosened by vibration. In the prior art, this drawback has not yet been solved.

【0004】そのため、例えば、大腿骨頭部などの骨折
治療に使用する海綿骨用ラグスクリューの弛み対策とし
て、必ず2本ないし3本のラグスクリューを別の位置か
ら捻込むか、あるいは骨ネジ1本と数本のキルシュナー
ピンを併用したりして、骨折部の密着性を保持するのが
常法になっていた。
Therefore, for example, as a measure against loosening of the cancellous bone lag screw used for treating fractures of the femoral head or the like, be sure to screw in two or three lag screws from different positions or use one bone screw. It has become a common practice to maintain the adhesion of the fractured part by using and several Kirschner pins together.

【0005】また、脊椎や腰椎の側湾変形、椎骨の脱臼
や破裂骨折、骨粗しょう症による圧迫骨折、腰椎すべり
症などの治療に使用される椎体スクリューには、ロッド
と呼ばれる固定用の金属棒を通すための環状または凹状
の冠がネジ頭に備わっている。このネジを患部の椎骨と
それに隣接する椎骨に捻込んだ後、患部を真直に修復
し、各ネジの頭冠にロッドを連通させることによって、
患部を真直に固定するものである。たいへんな大手術で
あるから、患者が死亡するまで矯正装置をなるべく回収
せず、体内に留置したままにしておくのが望ましい。し
かし、往々にしてネジが弛んで固定位置が外れてしま
い、猛烈な痛みや神経障害を惹起しがちであった。その
ため、再手術を余儀なくされる場合が少なくなかった。
[0005] Further, a vertebral body screw used for treatment of scoliosis of the spine and lumbar spine, dislocation and rupture of vertebral bone, compression fracture due to osteoporosis, lumbar spondylolisthesis, etc. The screw head is provided with an annular or concave crown for passing the rod. After screwing this screw into the vertebra of the affected area and the adjacent vertebra, the affected area is repaired straight and the rod is connected to the crown of each screw.
It fixes the affected area straight. Since it is a major surgery, it is desirable to keep the correction device in the body without collecting it until the patient dies. However, the screws were often loosened and the fixed position was dislocated, which tended to cause severe pain and neuropathy. For this reason, there are many cases in which reoperation is forced.

【0006】さらに、犬や猫など短命な小動物の場合、
四肢長骨などの骨折部に骨ネジで取り付けられた骨接合
プレートは、動物が死ぬまで放置しておいても悪影響は
なく、本来ならば骨折部の癒着後に除去する必要はない
ものである。しかるに、骨ネジの弛みを防止する方法が
ないために、もしもネジが弛んで脱落し、プレートのズ
レによる痛みや跛行などを惹起しては困るとの恐れか
ら、プレート回収のための無用な再手術が励行されてい
るのが実情であった。
Furthermore, in the case of short-lived small animals such as dogs and cats,
An osteosynthesis plate attached to a fractured part such as a long bone of a limb with a bone screw has no adverse effect even if it is left until the animal dies, and originally, it is not necessary to remove it after adhesion of the fractured part. However, there is no way to prevent the loosening of the bone screw, so if the screw loosens and falls off, it is not necessary to cause pain or lameness due to the displacement of the plate. The reality is that surgery is being enforced.

【0007】この発明は、従来の骨ネジがもつ以上のよ
うな欠点を解消させ、管状または盲管状の骨ネジを永久
的に骨内に留置させられるようにすると共に、留置した
骨ネジが絶対に弛むことのないようにした、骨内留置用
骨ネジを提供することを目的とする。
The present invention solves the above-mentioned drawbacks of conventional bone screws, allows a tubular or blind tubular bone screw to be permanently placed in the bone, and ensures that the placed bone screw is absolutely An object of the present invention is to provide an intraosseous indwelling bone screw which is not loosened.

【0008】[0008]

【課題を解決するための手段】この発明の骨内留置用骨
ネジは、管状または盲管状にした本体1の管壁に、骨セ
メントペーストを噴出させることのできる大きさの孔2
を、適宜間隔ごとに穿設したものである。
The bone screw for indwelling bone according to the present invention has a hole 2 having a size capable of ejecting a bone cement paste into a tube wall of a main body 1 having a tubular or blind tubular shape.
Are provided at appropriate intervals.

【0009】孔2は、骨セメントペーストを噴出させ、
かつ骨髄液を管腔内に導入するためのものであり、ペー
スト状の骨セメントが通過する大きさに穿孔してあれば
よい。従って、孔径や孔数を特に限定するものではない
が、孔2の直径は1〜2mm程度を最適とする。ただ
し、ネジ山6の谷へ穿孔するときには余り大きな穴を開
けられず、孔径1mm以下の微小孔としてもかまわな
い。また、孔と孔との間隔を特に限定するものではない
が、骨髄液が毛細管現象によって骨セメント層に浸透す
る距離は、せいぜい5mm程度である。従って、注入し
た骨セメントの確実な完全骨化を期する上で、各孔の間
隔を10mm以内とすることが望ましい。
The hole 2 allows the bone cement paste to be ejected,
In addition, it is for introducing the bone marrow fluid into the lumen, and may be perforated to a size that allows the paste-like bone cement to pass therethrough. Therefore, although the hole diameter and the number of holes are not particularly limited, the diameter of the hole 2 is optimally about 1 to 2 mm. However, when drilling in the valley of the screw thread 6, a too large hole cannot be formed, and a fine hole having a hole diameter of 1 mm or less may be used. Further, the distance between the holes is not particularly limited, but the distance that the bone marrow fluid penetrates into the bone cement layer by the capillary phenomenon is about 5 mm at most. Therefore, in order to ensure the complete ossification of the injected bone cement, it is desirable that the intervals between the holes be within 10 mm.

【0010】[0010]

【作用】この発明では、ネジ本体1に穿設した複数個の
孔2が、前記課題を解決するための働きをする。すなわ
ち、管状または盲管状の骨内留置用骨ネジを骨に捻込ん
だ後、ネジ頭4の管口から、外科用セメントガンなどを
用いてペースト状の生体活性型骨セメントを注入する。
その結果、管腔3内は骨セメントで完全に閉塞される。
そして、造骨細胞を富有する骨髄液が管壁の孔2から管
腔内に浸透し、10日前後で骨セメントが完全に骨化す
る。つまり、ネジ本体に適当な間隔で孔2を開けたこと
によって、初めて管腔内に骨髄液が導入されるようにな
り、管腔内の骨セメント全体を確実に骨化できるように
したわけである。
In the present invention, the plurality of holes 2 formed in the screw body 1 serve to solve the above-mentioned problems. That is, a tubular or blind tubular bone screw for intraosseous indwelling is screwed into the bone, and then a paste-like bioactive bone cement is injected from the mouth of the screw head 4 using a surgical cement gun or the like.
As a result, the inside of the lumen 3 is completely blocked by the bone cement.
Then, the bone marrow fluid rich in osteoblasts permeates into the lumen through the hole 2 in the wall of the tube, and the bone cement is completely ossified in about 10 days. That is, the bone marrow fluid is introduced into the lumen for the first time by forming the holes 2 in the screw body at appropriate intervals, and the bone cement in the lumen can be reliably ossified. .

【0011】しかも、骨セメントペーストを注入する
際、管腔3の奥、すなわちネジ先5から順に空隙を作ら
ぬようにして加圧充填することにより、図3に示すよう
に、管壁に穿設した複数個の孔2から、さらに管状ネジ
にあってはネジ先5の管口からも、骨セメントペースト
7が勢いよく管外へ噴出する。そして、網目状の隙間だ
らけの海綿骨の中へ、噴出した骨セメントが樹根状に押
し出される。それと同時に、管壁に沿って骨セメントが
ネジ全体を包み、骨組織とネジとの間隙を埋め尽くして
骨化する。
Moreover, when injecting the bone cement paste, pressure filling is performed without forming a void in order from the depth of the lumen 3, that is, from the screw tip 5, so that the bone wall is perforated as shown in FIG. The bone cement paste 7 is vigorously ejected out of the tube through the plurality of holes 2 provided and further through the tube opening of the screw tip 5 in the case of the tubular screw. Then, the spouted bone cement is extruded like a tree root into the cancellous bone covered with mesh-like gaps. At the same time, the bone cement wraps the entire screw along the wall of the tube, filling the gap between the bone tissue and the screw and ossification.

【0012】このため、海綿骨内へ樹根状に伸びた骨セ
メントがネジの周囲にしつかりと根を張る一方、ネジ全
体が内外ともに骨組織で被覆され、周囲の骨と完全に一
体化し結合する。従って、骨ネジが弛むという不都合な
現象は決して起こり得ない。さらに、ネジの管腔3内に
は骨化した生体活性型骨セメントが詰まっているから、
管腔内に骨髄液や血液などの体液が貯留する余地は全く
なくなる。従って、骨ネジを永久的に骨内に留置するこ
とができる。
[0012] Therefore, the bone cement extending like a dendritic root into the cancellous bone tightly roots around the screw, while the entire screw is covered with bone tissue both inside and outside, and completely integrated with the surrounding bone. To do. Therefore, the inconvenient phenomenon of loosening of bone screws can never occur. Furthermore, since the ossified bioactive bone cement is filled in the lumen 3 of the screw,
There is no room for body fluids such as bone marrow fluid or blood to accumulate in the lumen. Therefore, the bone screw can be permanently placed in the bone.

【0013】[0013]

【実施例】この発明の一実施例を、図1に基づいて説明
する。図1に示した骨内留置用骨ネジは、市販のチタン
合金製エース6.5キャニュレイテッドスクリュー(エ
ースメディカル社)をそのまま利用し、外径が5mmで
内径約4mnの管状本体1の管壁に、複数個の孔2をド
リルで穿設したものの斜視図である。従来のキャニュレ
イテッドスクリューは、既存のラグスクリューを管状に
したもので、図1に示すように、断面を環形にした管状
の本体1と、捻込み兼抜去用工具をはめるための六角ヘ
ッドと呼ばれるネジ頭4と、ガイドピンを通すためにネ
ジ頭4からネジ先5まで貫通させた管腔3と、本体1の
管壁外側に形成された螺旋状のネジ山6と、骨を切るた
めに先端を鋭利にしたネジ先5よりなる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. The bone screw for indwelling bone shown in FIG. 1 uses a commercially available titanium alloy ace 6.5 cannulated screw (Ace Medical Co., Ltd.) as it is, and has a tubular body 1 with an outer diameter of 5 mm and an inner diameter of about 4 mn. It is a perspective view of what formed a plurality of holes 2 in a pipe wall with a drill. The conventional cannulated screw is a tubular form of the existing lag screw. As shown in FIG. 1, a tubular main body 1 having an annular cross section and a hexagon head for fitting a screwing / withdrawing tool. Called a screw head 4, a lumen 3 penetrating from the screw head 4 to a screw tip 5 for passing a guide pin, a spiral thread 6 formed on the outside of the tube wall of the main body 1, and cutting bone Therefore, it is composed of a screw tip 5 having a sharp tip.

【0014】そもそもラグスクリューの機能は、強くネ
ジを締め付けることによって折れた骨を骨折面に引き寄
せ、骨折部を密着させることにある。そのため、締め付
けのための力の支点として、ネジ山の直径よりも大きな
外径を持つネジ頭を備え、図3に示すようにネジ頭4を
堅固な皮質骨にあてがうか、場合によっては、ワッシャ
ーを用いてネジ頭が骨内に沈没しないようにして締め付
ける。主に大腿骨の頭部や頸部の骨折、および脛骨高原
骨折や膝関節骨折などの治療に用いられるものである
が、これらの部位は骨が厚いため、かつては目的の位置
までラグスクリューを正確に捻入れるのに熟練を要して
いた。その欠点を解消するために、あらかじめ所定の位
置へガイドピンを打ち込んでおき、そのガイドピンに管
状のキャニュレイテッドスクリューを通すことによっ
て、的を外さず簡単に捻込めるようにしたものである。
しかる後、ガイドピンを抜き取る。
In the first place, the function of the lag screw is to pull the broken bone toward the fracture surface by tightly tightening the screw, and to bring the fracture portion into close contact. Therefore, as a fulcrum of the force for tightening, a screw head having an outer diameter larger than the diameter of the screw thread is provided, and the screw head 4 is applied to a solid cortical bone as shown in FIG. Tighten the screw head so that it does not sink into the bone. It is mainly used for the treatment of femoral head and neck fractures, tibial plateau fractures, knee joint fractures, etc.However, since these parts have thick bones, the lag screw was once used to reach the target position. It required skill to screw it in accurately. In order to eliminate the drawback, a guide pin is driven into a predetermined position in advance, and a tubular cannulated screw is passed through the guide pin so that the guide pin can be easily screwed in without losing the target. .
After that, pull out the guide pin.

【0015】しかし、ガイドピンを抜去すれば、キャニ
ュレイテッドスクリューの管腔は中空になるので、骨髄
液や血液がネジ頭の管口から漏出する。その排液処理に
難点があるため、骨折部の癒合を待って、速やかに管状
ネジを抜去するための再手術をしなければならなかっ
た。そのため、再手術が困難な高齢患者や、短命なるが
故に骨ネジ抜去を不要とする犬猫など小動物の場合、便
利な管状ネジを利用できず、昔ながらの中実のラグスク
リューが用いられていた。
However, if the guide pin is removed, the lumen of the cannulated screw becomes hollow, so that bone marrow fluid and blood leak out from the mouth of the screw head. Because of the difficulty in drainage treatment, it was necessary to wait for the fracture to heal and then re-operate to quickly remove the tubular screw. Therefore, for elderly patients who are difficult to re-operate, or small animals such as dogs and cats who do not need bone screw removal because they are short-lived, convenient tubular screws cannot be used and old solid lag screws were used. .

【0016】これらの問題点は、この実施例の有孔キャ
ニュレイテッドスクリューを使用することによって、一
挙に解消することができる。すなわち、従来のキャニュ
レイテッドスクリューと同様に、あらかじめ打ち込んだ
ガイドピンを軸にして骨内に捻入れ、所定の位置まで捻
込んで骨折部をきつく締め付け終えたら、ガイドピンを
抜き取る。そして、図3に示すように、中空の管腔3に
骨セメントペースト7を加圧充填すれば、管腔内に体液
が貯留する余地はなくなる。故に、排液処理に悩まされ
ることなく骨内に留置することができる。また、このネ
ジは決して弛まないから、従来のように2本も3本も捻
込む必要がなく、1本の有孔キャニュレイテッドスクリ
ューだけで確実に骨折部を固定することができる。
These problems can be solved all at once by using the perforated cannulated screw of this embodiment. That is, like a conventional cannulated screw, the guide pin that has been driven in advance is used as an axis for screwing into the bone, and when the screw is screwed to a predetermined position and the fractured part is tightly tightened, the guide pin is pulled out. Then, as shown in FIG. 3, by filling the hollow lumen 3 with the bone cement paste 7 under pressure, there is no room for the body fluid to be stored in the lumen. Therefore, it can be placed in the bone without being bothered by the drainage process. Further, since this screw never loosens, it is not necessary to screw in two or three screws as in the conventional case, and the fractured portion can be reliably fixed with only one perforated cannulated screw.

【0017】しかも、従来の中実のラグスクリューを屋
外飼育犬に留置すると、冬の寒い朝などに骨内の金属ネ
ジが冷えるため、痛がって骨ネジ留置部の皮膚を咬んだ
り、びっこを引いたりすることが多かった。ところが、
有孔キャニュレイテッドスクリューを試用中の実験犬で
判明したことであるが、厳寒期においても上記の弊害が
全く認められなかった。これは、骨化した骨セメントで
金属ネジを被覆したことによる予期せぬ効果であり、極
めて好ましい長所である。
Moreover, when the conventional solid lag screw is left in the outdoor breeding dog, the metal screw in the bone cools in the cold morning of winter, so that the skin of the bone screw indwelling part is bitten, I often drowned. However,
It was revealed in the experimental dogs that were using the perforated cannulated screw that the above-mentioned adverse effects were not observed at all even in the severe cold season. This is an unexpected effect of coating the metal screw with ossified bone cement, which is a very favorable advantage.

【0018】なお、骨外に露出したネジ頭4は、図3に
示すように、露出させたままにしておいてかまわない。
あるいは、露出したネジ頭全体に骨セメントを塗布し、
埋覆するようにしてもよい。
The screw head 4 exposed outside the bone may be left exposed as shown in FIG.
Alternatively, apply bone cement to the entire exposed screw head,
It may be embedded.

【0019】図2は、この発明の別の実施例を示す断面
図である。すなわち、椎体スクリューと呼ばれる中実の
骨ネジに盲管状の管腔3を設けたものであり、ネジ頭4
からネジ先5に向けて本体1の中軸に成形された管腔3
は、ネジ先5に開口していない。そして、ネジ頭4の管
口から盲管内に注入された骨セメントペーストをネジの
外へ噴出させるために、ネジ山6の谷間には適宜間隔ご
とに孔2が穿設されている。
FIG. 2 is a sectional view showing another embodiment of the present invention. That is, a solid bone screw called a vertebral body screw is provided with a blind tubular lumen 3, and a screw head 4
Lumen 3 formed in the center axis of the main body 1 from the direction toward the screw tip 5
Has no opening in the screw tip 5. Then, in order to eject the bone cement paste injected into the blind canal from the tube opening of the screw head 4 to the outside of the screw, holes 2 are formed at appropriate intervals in the valleys of the screw threads 6.

【0020】この盲管状椎体スクリューを使用するとき
は、ネジ頭4の環状冠に工具をはめて椎骨に捻込み、各
ネジの頭冠の向きを一定方向に揃えてから、セメントガ
ンを用いて各ネジの管腔内にペースト状の生体活性型骨
セメントを注入する。骨セメントは3〜5分後に硬化し
始めるので、硬化しないうちに素早く矯正器のロッドを
各ネジの頭冠に連通し、あらかじめ適正な位置に修復し
ておいた患部を、適正状態のままロッドで固定する。
When this blind tubular vertebral body screw is used, a tool is applied to the annular crown of the screw head 4 and screwed into the vertebra, and the direction of the crown of each screw is aligned in a certain direction, and then a cement gun is used. Then, paste bioactive bone cement is injected into the lumen of each screw. Since bone cement begins to harden after 3 to 5 minutes, the rod of the orthodontic appliance is quickly connected to the crown of each screw before it hardens, and the affected part that has been restored to the proper position in advance is kept in the proper state. Fix with.

【0021】やがて、ネジに注入した生体活性型骨セメ
ントの骨化に伴い、ネジがしっかり骨と結合し絶対に弛
まなくなる。このため、ネジの弛みによる修復患部の歪
みや、矯正器のズレによる患者の激痛、神経障害などの
心配がなくなる。従って、脊椎の側湾変形などの骨格矯
正器を、患者の体内に永久的に留置することができる。
しかも、骨粗しょう症が原因で起きた骨折の場合など、
ネジの孔から樹根状に押し出された骨セメントが、脆弱
化した骨質の強度を著しく高める作用を発揮する。この
ため、患部付近の再骨折を未然に防止すると共に、その
補強効果によって、骨折治療のために使用する骨ネジの
数を減らすこともできる。
Eventually, as the bioactive bone cement injected into the screw becomes ossified, the screw will firmly bond with the bone and will never loosen. Therefore, there is no need to worry about the distortion of the repaired part due to the looseness of the screw, the severe pain of the patient due to the displacement of the correction device, and the nerve damage. Therefore, a skeletal corrector such as the scoliosis of the spine can be permanently placed in the patient's body.
Moreover, in the case of a bone fracture caused by osteoporosis,
The bone cement extruded in a dendritic form from the hole of the screw exerts an action of remarkably increasing the strength of the weakened bone substance. Therefore, it is possible to prevent re-fracture in the vicinity of the affected area and to reduce the number of bone screws used for fracture treatment due to its reinforcing effect.

【0022】さらに他の中実の骨ネジ、すなわち海綿骨
用、皮質骨用、顎骨用、骨端用ネジ、および骨接合用各
種プレートを骨折部に固定するための骨ネジ全般につい
ても、上記椎体スクリューと同様に、ネジ本体への盲管
形成と管壁穿孔とにより、ネジの弛みを防止して骨内留
置を可能にすることができる。故に、これらの骨内留置
用骨ネジを使用することによって、高齢者や寿命の短い
犬猫などから、骨折部の癒合後に骨ネジや骨プレートを
除去する必要がなくなる。
Further, other solid bone screws, namely, cancellous bone, cortical bone, jaw bone, epiphyseal screws, and bone screws for fixing various plates for osteosynthesis to a fractured part are also described above. Similar to the vertebral body screw, the formation of a blind tube in the screw body and perforation of the tube wall can prevent loosening of the screw and enable implantation in the bone. Therefore, by using these bone screws for indwelling bones, it is not necessary to remove the bone screws and the bone plate after the fusion of the fractured part from the elderly and dogs and cats having a short life.

【0023】[0023]

【発明の効果】この発明は、捻込み後に決して弛むこと
がない骨内留置用骨ネジを提供するものである。従来の
骨ネジには、弛みやすいという致命的な欠点があった。
そこで、市販の生体活性型骨セメントに着眼し、これを
接着剤代わりに利用するための具体的手段として、ネジ
本体の中軸に骨セメントを充填するための管腔を設け、
その骨セメントをネジの周囲に噴出させるための穴を開
けたことによって、従来の欠点を完全に解消することが
できた。
The present invention provides an intraosseous indwelling bone screw that never loosens after screwing. The conventional bone screw has a fatal defect that it is easily loosened.
Therefore, focusing on commercially available bioactive bone cement, as a concrete means for using this instead of an adhesive, the central axis of the screw body is provided with a lumen for filling the bone cement,
By forming a hole for ejecting the bone cement around the screw, the conventional defects could be completely eliminated.

【0024】弛みを防止できたことにより、この骨内留
置用骨ネジは次のような優れた効果を奏する。すなわ
ち、従来は、ネジの弛みによる骨折部の固定不確実を恐
れ、数本の骨ネジを角度や方向を変えて捻込む必要があ
ったのであるが、この骨内留置用骨ネジを使用すれば、
1本だけで確実に骨折部を固定することができる。この
ため、接骨手術に要する手間が著しく軽減し、手術時間
も短縮する。
Since the loosening can be prevented, the bone screw for indwelling the bone has the following excellent effects. That is, in the past, it was necessary to screw in several bone screws by changing the angle and direction due to fear of uncertain fixation of the fractured part due to loosening of the screw. If
The fractured part can be reliably fixed with only one. For this reason, the labor required for the bone grafting operation is significantly reduced, and the operation time is also shortened.

【0025】また、脊椎や腰椎に直接固定する骨格矯正
器は、骨ネジが弛むと適正位置から外れ、激痛や神経障
害を惹起するなどの由々しき問題があった。これも骨内
留置用骨ネジを使用することによって、患者が死亡する
まで再手術の不安なく矯正器を装着しておくことができ
る。
Further, the skeletal braces which are directly fixed to the spine or the lumbar spine have a serious problem that they are displaced from their proper positions when the bone screws are loosened, causing severe pain and neuropathy. Also, by using the bone screw for indwelling the bone, the orthodontic bracket can be worn without fear of re-operation until the patient dies.

【0026】さらに、骨折治療のために高齢者や犬猫に
装着した骨接合プレート類は、本来ならば、わざわざ再
手術をしてまで回収する必要のないものである。しか
し、プレートを固定する骨ネジに弛みが生じると、痛み
や跛行、再骨折などの危険があるため、従来よりプレー
トを除去する再手術が慣習化されていた。このような無
駄な再手術は、骨内留置用骨ネジを使用することによっ
て行なわずに済む。このため、肉体的にも、精神的に
も、経済的にも負担の大きかった再手術から、高齢者や
小動物を解放することができる。
Further, the bone-bonding plates attached to the elderly and dogs and cats for the treatment of bone fractures do not need to be re-operated to be recovered, as they are originally. However, if the bone screw that fixes the plate is loosened, there is a risk of pain, lameness, re-fracture, etc. Therefore, re-operation for removing the plate has been conventionally practiced. Such useless re-operation is unnecessary by using the bone screw for indwelling the bone. For this reason, it is possible to free the elderly and small animals from re-operation which has been physically, mentally and economically burdensome.

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

【図1】この発明の一実施例を示す斜視図である。FIG. 1 is a perspective view showing an embodiment of the present invention.

【図2】この発明の他の実施例を示す断面図である。FIG. 2 is a sectional view showing another embodiment of the present invention.

【図3】この発明の使用状態を示す側面図である。FIG. 3 is a side view showing a usage state of the present invention.

【符号の説明】[Explanation of symbols]

1は本体 2は孔 3は管腔 4はネジ頭 5はネジ先 6はネジ山 7は骨セメント 1 is a main body 2 is a hole 3 is a lumen 4 is a screw head 5 is a screw tip 6 is a screw thread 7 is a bone cement

Claims (1)

Translated fromJapanese
【特許請求の範囲】[Claims]【請求項1】 管状または盲管状のネジ本体にネジ山を
備えた骨ネジにおいて、本体1の管壁に、骨セメントペ
ーストを噴出させることのできる大きさの孔2を適宜間
隔ごとに穿設した、骨内留置用骨ネジ。
1. A bone screw having a threaded body of a tubular or blind tubular screw body, wherein holes 2 of a size capable of ejecting bone cement paste are formed at appropriate intervals in a tube wall of the body 1. Bone screw for indwelling in the bone.
JP5234353A1993-08-161993-08-16Bone screw left in bonePendingJPH0751292A (en)

Priority Applications (1)

Application NumberPriority DateFiling DateTitle
JP5234353AJPH0751292A (en)1993-08-161993-08-16Bone screw left in bone

Applications Claiming Priority (1)

Application NumberPriority DateFiling DateTitle
JP5234353AJPH0751292A (en)1993-08-161993-08-16Bone screw left in bone

Publications (1)

Publication NumberPublication Date
JPH0751292Atrue JPH0751292A (en)1995-02-28

Family

ID=16969676

Family Applications (1)

Application NumberTitlePriority DateFiling Date
JP5234353APendingJPH0751292A (en)1993-08-161993-08-16Bone screw left in bone

Country Status (1)

CountryLink
JP (1)JPH0751292A (en)

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