JP3575208B2 - Osteosynthesis screw - Google Patents

Osteosynthesis screw Download PDF

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JP3575208B2
JP3575208B2 JP01949297A JP1949297A JP3575208B2 JP 3575208 B2 JP3575208 B2 JP 3575208B2 JP 01949297 A JP01949297 A JP 01949297A JP 1949297 A JP1949297 A JP 1949297A JP 3575208 B2 JP3575208 B2 JP 3575208B2
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screw
bone
osteosynthesis
hole
body
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JPH10211213A (en
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滋郎 丹羽
圭造 森川
啓泰 竹内
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三菱マテリアル株式会社
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    • 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
    • A61B17/7097Stabilisers comprising fluid filler in an implant, e.g. balloon; devices for inserting or filling such implants
    • A61B17/7098Stabilisers comprising fluid filler in an implant, e.g. balloon; devices for inserting or filling such implants wherein the implant is permeable or has openings, e.g. fenestrated screw
    • 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
    • A61B17/74Devices for the head or neck or trochanter of the femur
    • A61B17/742Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
    • 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
    • A61B17/864Threaded wires, pins or screws; Nuts therefor hollow, e.g. with socket or cannulated
    • 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

Description

【0001】 [0001]
【発明の属する技術分野】 BACKGROUND OF THE INVENTION
本発明は、骨接合用螺子に係り、特に骨粗鬆症を合併した大腿骨頸部骨折に対する手術等における骨強化法の実施に用いて好適な骨接合用螺子に関する。 The present invention relates to a suitable bone screw used in the practice of the bone strengthening method in relates to osteosynthesis screws, surgical, etc. Especially for combined femoral neck fracture osteoporosis.
【0002】 [0002]
【従来の技術】 BACKGROUND OF THE INVENTION
従来、骨粗鬆症を合併する大腿骨頸部骨折に対する手術では、キャニュレイテッドスクリューと称される骨接合用螺子がしばしば用いられている。 Conventionally, in surgery for hip fractures complicated by osteoporosis, calibration New Ray Ted screw referred osteosynthesis screws are often used.
これは、外周面に一端側から螺子部が形成された棒状の螺子本体に、該螺子本体を軸線方向に貫通するガイド孔と称する中空孔が形成されてなるもので、骨頭部に挿入したガイドピンにガイド孔を挿通し、レンチあるいはスクリュードライバーによって螺子本体を時計回りに回転させ、挿入し、骨頭部と骨幹部に生じた骨折部を圧迫固定するものである。 Guide This is rod-shaped screw body screw portion from one end side is formed on an outer peripheral surface, in which hollow holes called guide holes through the 該螺Ko body in the axial direction is formed, which is inserted into the bone head a guide hole inserted into the pin, the screw body is rotated clockwise by a wrench or screwdriver, inserted, is intended to compress fixing the fracture generated in the bone head and the bone stem.
【0003】 [0003]
ところが、重度の骨粗鬆患者の場合など、大腿骨頭の骨質が脆弱化していると、キャニュレイテッドスクリューによる機械的な固定だけでは固定強度が不十分であった。 However, such as in the case of severe osteoporosis patients, and bone quality of the femoral head is weakened, only mechanical fixation by calibration New Ray Ted screw fixation strength was insufficient. このため、何等かの補強手術法が必要とされているが、その一つとして、近年、リン酸カルシウムセメントなどのバイオアクティブな骨セメントを併用する充填補強法が注目されている。 Therefore, although some kind of reinforcement surgery is required, as one, in recent years, reinforcing filling method used in combination bioactive bone cements such as calcium phosphate cement has attracted attention.
従来の骨セメントでは、重合時の発熱、未重合モノマーの循環系に対する影響、生体親和性などの点で使用に難があったが、リン酸カルシウムセメントは、発熱性、生体毒性の問題がない上に骨親和性に優れているため、かかる問題がなく、骨梁が粗となった骨にこれを注入し、脆弱化した骨を強化するとともに引き抜き強度を高めることが可能となる。 In conventional bone cements, during polymerization of the heating effects on the circulatory system of the unpolymerized monomer, there was difficulty in use in terms of biocompatibility, calcium phosphate cements, exothermic, on which no biological toxicity problems excellent for use in bone affinity, no such problem, and inject it into the bone where the trabecular becomes coarse, it is possible to increase the pull-out strength to strengthen bones weakened.
【0004】 [0004]
【発明が解決しようとする課題】 [Problems that the Invention is to Solve
しかし、骨セメントを併用する充填補強法を採用する場合、骨セメントとしてリン酸カルシウムセメントを用いるとしても、従来のキャニュレイテッドスクリューでは、本来その構造が骨セメントの併用を目的として作製されていないため、骨セメントを別個の手段で注入した後に、あらためてキャニュレイテッドスクリューにより固定を行う二段階の操作が必要であった。 However, when adopting the reinforcing filling method combination of bone cement, as well using calcium phosphate cement as the bone cement, in the conventional calibration New Ray Ted screw, its structure is inherently not prepared for the purpose of combined use of bone cement , after implanting bone cement in a separate unit, it was necessary two-stage operation for performing fixed by again calibration New Ray Ted screw.
【0005】 [0005]
本発明は、上記事情に鑑みてなされたもので、任意に骨セメントを注入することができる上、従来の骨接合螺子が有する固定強度を損なうことなく充分に螺子として機能する骨接合用螺子を提供することを目的とする。 The present invention has been made in view of the above circumstances, on capable of injecting bone cement optionally, a bone screw that sufficiently functions as a screw without impairing the fixing strength of conventional osteosynthesis screw has an object of the present invention is to provide.
【0006】 [0006]
【課題を解決するための手段】 In order to solve the problems]
しかして、本発明は、外周面に一端側から螺子部が形成された棒状の螺子本体に、該螺子本体を軸線方向に貫通する中空孔が形成されてなり、螺子部側から骨内に挿入されて骨に螺合させられる骨接合用螺子において、上記螺子本体の周壁(螺子本体の径方向に向く壁部)に、内端が上記中空孔に連通し外端が外部に開放された複数の透孔を、 該透孔の数および/または開口面積が螺子本体の上記一端に近付くにつれて大になるように、螺子本体の軸線方向及び周方向に離散して形成したことを特徴とする。 Thus, the present invention is inserted, the rod-shaped screw body screw part is formed from one end side to the outer peripheral surface, made with hollow hole is formed to penetrate the 該螺Ko body axially from the threaded portion side in the bone in is in osteosynthesis screw for screwed into the bone is, the peripheral wall (wall portion facing in the radial direction of the screw body) of the screw body, a plurality of inner end communicating with the outer end in the hollow hole is opened to the outside through hole, the number and / or the opening area of the translucent hole is to be larger as it approaches the one end of the screw body, characterized by being formed discretely in the axial direction and the circumferential direction of the screw body.
【0007】 [0007]
上記において、複数の透孔は、螺子部に形成されていることが好ましく、透孔の各々は、略円形の断面を有していても、スリット状の断面を有していても、略長円形の断面を有していても、さらにはこれら種々の形状を組合わせたものでも構わない。 In the above, a plurality of through holes is preferably formed in the thread portion, each of the through holes also have a substantially circular cross-section, may have a slit-like cross-section, substantially the length have a circular cross-section, may be one more a combination of these various shapes.
また、透孔は螺子部の山部と谷部に渡って形成しても構わないし、細孔の場合は螺子部の谷部にのみ形成することもできる。 Further, through holes are to may be formed over the peaks and valleys of the screw portion, in the case of the pore can be formed only on the valleys of the screw portion.
【0008】 [0008]
本発明の骨接合用螺子は、従来のキャニュレイテッドスクリューと同様にして使用することもできるが、重度の骨粗鬆患者の場合など、患者の大腿骨頭の骨質が脆弱化している場合には、従来のキャニュレイテッドスクリューと同様にして大腿骨頭に固定した後に、骨セメント、特にリン酸カルシウムセメントなどのバイオアクティブな骨セメントを、ガイドピンのガイド孔とのなる中空孔に注入する。 Osteosynthesis screw of the present invention can also be used in the same manner as the conventional calibration New Ray Ted screw, such as in the case of severe osteoporosis patients, if the bone quality of the patient's femoral head is weakened , after fixed to the femoral head in the same manner as the conventional calibration New Ray Ted screw, bone cement, in particular a bio-active bone cements such as calcium phosphate cement is injected into the hollow hole made with the guide pins of the guide hole. 注入された骨セメントは中空孔から周壁の透孔を通じて、粗鬆化した骨の骨梁間に入り込む。 Injected bone cement through hole of the peripheral wall from the hollow hole, it enters the trabecular bone of rarefaction bone. これにより、骨自体が強化されるとともに引き抜き強度も高められる。 Thus, pull-out strength is also enhanced with the bone itself is enhanced.
また、本発明の骨接合用螺子では、周壁に形成されている透孔に骨セメントもしくは骨組織が侵入することになるため、固定後の螺子の回転も合わせて防止することができる。 Further, in osteosynthesis screw of the present invention, since the bone cement or bone tissue in holes formed in the peripheral wall is able to penetrate, it is possible to prevent also to the rotation of the fixed post of the screw. この回転防止の効果は、螺子を固定する部位に予め骨セメントを注入した場合においても発揮される。 The anti-rotation effect is also exerted in the case of previously injected with bone cement to a site for fixing the screws.
また、骨内の挿入方向である一端側により多くの骨セメントを吐出させることができるので、挿入した螺子の固定がより強固になる。 Further, it is possible to eject a number of bone cement by one end an insertion direction of the bone, fixation of the inserted screws become stronger.
【0009】 [0009]
【発明の実施の形態】 DETAILED DESCRIPTION OF THE INVENTION
以下、本発明に係る骨接合用螺子の好適な実施の形態を、添付図面を参照して詳細に説明する。 Hereinafter, a preferred embodiment of the screw for osteosynthesis of the present invention will be described in detail with reference to the accompanying drawings.
【0010】 [0010]
図1は、骨接合用螺子の全体を示す側面図であり、図中1は、螺子本体を示す。 Figure 1 is a side view showing an entire screw for osteosynthesis, figure 1 shows a screw body. 螺子本体1は、生体融和性、強度、剛性等を兼ね備えた材料であるチタン合金から形成されており、先端(一端)側に螺子部2を備え、基端(他端)側が非螺子部3とされ、他端には六角レンチあるいはスクリュードライバーの先端等が挿入係合される頭部4が設けられている。 Screw body 1, the biological compatible, strength, is formed of a titanium alloy which is a material having both rigidity, provided with a threaded portion 2 to the tip (one end) side, the base end (the other end) side non-screw portion 3 It is a head 4 of the tip or the like of the hex wrench or screwdriver is inserted into and engaged is provided at the other end.
ここで、螺子本体1の長さ、径、螺子部もしくは非螺子部の長さ、螺子山径等は、あらゆる患者に適応できるように種々のものが用意されることとなる。 Here, the length of the screw body 1, the diameter, the screw portion or the non-threaded portion of the length, thread size, etc. so that the various ones are prepared to adapt to any patient.
上記螺子本体1には、該螺子本体1を軸線方向(長軸方向)に貫通する中空孔5が形成されており、該中空孔5に後記するガイドピンが挿入できるようになっている。 The aforementioned screw body 1 has a hollow hole 5 is formed which penetrates the 該螺Ko body 1 in the axial direction (long axis direction), later described guide pin is adapted to be inserted into the hollow hole 5. また、螺子本体1の先端は凹状に切り欠かれて骨への挿入が容易となるようにされている。 The tip of the screw body 1 is cut out in a concave shape so as to be easily inserted into the bone.
【0011】 [0011]
上記の構成までは、基本的には従来のキャニュレイテッドスクリューと同様であるが、本発明に係る骨接合用螺子では、図2に拡大して示すように、上記螺子本体1の周壁で螺子部2の谷部2aには、内端が上記中空孔5に連通し外端が外部に開放された複数の透孔6が、螺子本体1の軸線方向及び周方向に離散した状態で形成されている。 Until the above configuration is basically the same as the conventional calibration New Ray Ted screw, the bone screw according to the present invention, as shown enlarged in FIG. 2, in the peripheral wall of the screw body 1 the valley portion 2a of the threaded portion 2, a plurality of through holes 6 which inner end communicating with the outer end in the hollow hole 5 is opened to the outside, formed in a state of being discrete in the axial direction and the circumferential direction of the screw body 1 It is. そして、ガイドピンの挿通孔ともなる上記中空孔5に骨セメントを注入すると、この複数の透孔6を通じて、骨セメントが周壁から側方に放出させられるようになっている。 When injecting the bone cement into the hollow hole 5 becomes the insertion hole of the guide pin, through the plurality of through holes 6, the bone cement is adapted to be released from the peripheral wall laterally.
【0012】 [0012]
ここで、図1及び図2に示す例では、透孔6は、全て同一の径の略円形の断面のものとし、螺子部2の螺旋状の谷部2aに等間隔に設けている。 In the example shown in FIGS. 1 and 2, holes 6 are all assumed a substantially circular cross-section of the same diameter, are provided at equal intervals on the spiral trough portion 2a of the threaded portion 2. しかし、透孔6の形状、配置等は、この例に限るものではなく、種々の変形が可能である。 However, the shape of the through hole 6, the arrangement, etc., is not limited to this example, and various modifications are possible.
【0013】 [0013]
図3は、かかる変形例の一つを示すもので、上記螺子部2の谷部2aに、同一の離間間隔を開けて、該谷部2aの延びる方向に長い長円状の透孔6aを設けている。 Figure 3 shows one such modification, the valley portion 2a of the screw 2, by opening the same separation distance, a long oval through hole 6a in the direction of extension of the valley portion 2a It is provided. この長円状の透孔6aは、螺子本体1の先端に近接する位置では長径がかなり長い長円であるが、螺子本体1の基端に向かうにつれて、長円の長径が徐々に短くなっていっており、螺子部2の終端付近ではほぼ円形とされている。 The oblong hole 6a is in a position close to the tip of the screw body 1 is a rather long elliptical major axis, toward the proximal end of the screw body 1, the major axis of the ellipse is not gradually reduced and Tsu, are substantially circular near the end of the threaded portion 2.
このような構造では、螺子本体1の先端側になるほど透孔の開口面積が大きくなり、螺子本体1の先端寄りの周壁からより多くの骨セメントが放出されるようになる。 In this structure, the opening area of ​​the hole as made on the distal end side of the screw body 1 is increased, so that more bone cement is discharged from the peripheral wall of the tip side of the screw body 1.
【0014】 [0014]
図4は他の変形例を示すもので、この例では、透孔6bは螺子部2の谷部2aのみならず山部2bにも渡って形成されており、螺子本体1の周方向及び軸線方向に等間隔に配設されているが、螺子本体1の先端側では螺子本体1の軸線方向に延びるスリット状とされ、基端側になるにつれて短くされた形状とされている。 Figure 4 shows another modification, in this example, through holes 6b are formed Over the becoming without crests 2b only troughs 2a of the threaded portion 2, the circumferential and axial screw body 1 have been arranged at equal intervals in the direction, the tip end of the screw body 1 is a slit shape extending in the axial direction of the screw body 1, there is a shorter shape as the underlying end. この例でも、螺子本体1の先端側になるほど開口面積が大きくなり、螺子本体1の先端側の周壁からより多くの骨セメントが放出されるようになる。 In this example, as the opening area becomes the distal end side of the screw body 1 is increased, so that more bone cement is discharged from the peripheral wall of the distal end side of the screw body 1.
【0015】 [0015]
このような複数の透孔の形状、大きさ、数及び配置は、上記以外にも種々の変形が可能である。 Such a shape of the plurality of through holes, the size, number and arrangement, but various modifications are possible other than the above. 特に、螺子部2に限って形成すべきものでもなく、骨中に挿入される部位ならば、螺子本体1の周壁のどこに形成してもよく、従って、非螺子部3に形成しても構わない。 In particular, neither should be formed only on the threaded portion 2, if the site to be inserted into bone, it may be formed anywhere of the peripheral wall of the screw body 1, therefore, may be formed on the non-screw portion 3 . また、適応症例に応じて透孔の離散位置を変更して形成することもできる。 It can also be formed by changing the discrete positions of the through-hole in accordance with the adaptive case.
【0016】 [0016]
しかして、上記構成の骨接合用螺子を用いて骨接合手術を行う場合は、先ず、従来のキャニュレイテッドスクリューと同様にして骨接合用螺子を骨中に挿入する。 Thus, when performing osteosynthesis surgery with osteosynthesis screw having the above structure, first, similarly to the conventional calibration New Ray Ted screw inserting a screw for osteosynthesis in the bone. すなわち、図5に示すように、アングルガイド7で骨接合用螺子を刺入する角度を決め、ガイドピン8を骨幹部外側から骨頭内に挿入する。 That is, as shown in FIG. 5, determines the angle of insertion of the screw for osteosynthesis with angle guide 7, the guide pin 8 is inserted from the outside diaphysis into the bone head. ついで、図6に示すように、ガイドピンデプスゲージ9を用いて、ガイドピン8の骨内挿入部の長さを測定し、使用する骨接合用螺子の長さを決める。 Then, as shown in FIG. 6, using the guide pin depth gauge 9 measures the length of the bone in insertion of the guide pins 8, determine the length of the bone screw to be used. そして、図7に示すように、骨接合用螺子の中空孔5へガイドピン8を挿入することにより、骨接合用螺子の先端が骨幹部に至るまで挿入する。 Then, as shown in FIG. 7, by inserting the guide pin 8 into the hollow bore 5 of the screw for osteosynthesis, the tip of the screw for osteosynthesis inserts up to the diaphysis. ついで、図8に示すように、六角レンチあるいはスクリュードライバー等により骨接合用螺子を螺入し、骨頭部と骨幹部に生じた骨折部を圧迫固定し、その後ガイドピン8を抜去する。 Then, as shown in FIG. 8, and screwed a screw for osteosynthesis by hex wrench or screwdriver or the like, the fracture generated in the bone head and the diaphysis is compressed and secured, for removing the subsequent guide pin 8. 図9は2本の骨接合用螺子の装着が完了した状態を示す。 Figure 9 shows a state where the mounting is completed the two osteosynthesis screws.
なお、螺子本体1の頭部4が骨中に埋没する恐れのある場合は、頭部4の前にワッシャ(図示せず)を介在させる。 Incidentally, when the head 4 of the screw body 1 are likely to be buried in the bone, it is interposed a washer (not shown) in front of the head 4.
【0017】 [0017]
ついで、骨セメント、特にリン酸カルシウムセメントなどのバイオアクティブな骨セメントを各骨接合用螺子の基端側から中空孔5内に注入する。 Then, the bone cement, in particular injected bioactive bone cements such as calcium phosphate cement from the proximal end side of the bone screw into the bore 5. 中空孔5内に注入された骨セメントは複数の透孔6、6a、6bを通じて粗鬆化した骨中に押し出される。 Bone cement injected into the hollow hole 5 is pushed into the bone and rarefaction plurality of through holes 6, 6a, through 6b. このようにして、骨自体が強化されるとともに、骨接合用螺子の引き抜き強度も高められる。 In this manner, the bone itself is strengthened, pull-out strength of the screw for osteosynthesis may be enhanced. また、骨セメントもしくは骨組織が透孔6、6a、6bに進入するため、螺子の逆回転(もどり)も確実に防止できる。 Further, in order to enter the bone cement or bone tissue through holes 6, 6a, to 6b, the reverse rotation of the screw (return) can also reliably prevented.
【0018】 [0018]
上記構成の骨接合用螺子にあっては、中空孔5から周壁の透孔6、6a、6bを通じて、骨セメントを骨梁が粗となった大腿骨頸内に注入することができるので、骨セメントの注入手技を骨折固定手術と同時にしかも容易に実施することができる。 In the osteosynthesis screw having the above structure, through hole of the peripheral wall from the bore 5 6, 6a, through 6b, it is possible to inject bone cement into the femur 頸内 the trabecular becomes coarse, bone can be simultaneously and easily performed and fracture fixation surgery injection technique of the cement.
また、透孔6、6a、6bは、螺子本体1の軸線方向及び周方向に離散して形成されているので、骨中の必要な部位に骨セメントを満遍なくかつ的確に流し込むことが可能になる。 Further, through holes 6, 6a, 6b, so are formed discretely in the axial direction and the circumferential direction of the screw body 1, it is possible to the required site in the bone pouring bone cement to uniformly and accurately .
【0019】 [0019]
なお、本発明に係る骨接合用螺子の使用方法は、上記したものに限るものではなく、注入する骨セメントの種類、適用する症例、用途等についても任意である。 Incidentally, the use of screw for osteosynthesis of the present invention is not limited to those described above, the type of bone cement to be injected, cases of applying, are arbitrary for applications like. また、単に従来のキャニュレイテッドスクリューの代替として使用することもできる。 It is also possible to simply use as a replacement for conventional calibration New Ray Ted screw.
【0020】 [0020]
【発明の効果】 【Effect of the invention】
本発明に係る骨接合用螺子では、患者の大腿骨頭等に固定した後に、骨セメント、特にリン酸カルシウムセメントなどのバイオアクティブな骨セメントを、中空孔と透孔を通じて骨内に注入することができるので、骨梁自体を強化できる上に引き抜き強度を高めることができる。 The bone screw according to the present invention, after securing to the patient's femoral head, etc., a bone cement, in particular a bio-active bone cements such as calcium phosphate cements, because it can be injected into a bone through the hollow hole and through hole , it is possible to increase the strength pulling on that can enhance the trabecular itself. 特に、骨内の挿入方向である一端側により多くの骨セメントを吐出させることができるので、挿入した螺子の固定がより強固になる。 In particular, it is possible to eject a number of bone cement by one end an insertion direction of the bone, fixation of the inserted screws become stronger.
また、透孔を、螺子本体の軸線方向及び周方向に離散して形成しているので、骨中の必要な部位に骨セメントを満遍なくかつ的確に流し込むことができる等の効果を奏する。 Further, through holes, and since the formed discretely in the axial and circumferential directions of the threaded body, an effect such as can be the required site in the bone pouring bone cement to uniformly and accurately.
【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS
【図1】本発明に係る骨接合用螺子の全体を示す一部破断側面図である。 1 is a partially broken side view showing an entire bone screw according to the present invention.
【図2】図1の骨接合用螺子の要部の拡大図である。 2 is an enlarged view of a main portion of the bone screw of FIG.
【図3】図2と同様の図で、本発明の変形例を示す図である。 [3] In view similar to FIG. 2 is a diagram showing a modification of the present invention.
【図4】図2と同様の図で、本発明の他の変形例を示す図である。 [4] In view similar to FIG. 2 is a diagram showing another modification of the present invention.
【図5】本発明に係る骨接合用螺子の使用方法の一過程を示す概略図で、ガイドピンを挿入している状態を示す図である。 [5] a schematic view showing one process of using the osteosynthesis screw according to the present invention, is a diagram showing a state of inserting the guide pin.
【図6】図5と同様の図で、ガイドピンの挿入長さを測定している状態を示す図である。 [6] In view similar to FIG. 5 is a diagram showing a state of measuring the insertion length of the guide pin.
【図7】図5と同様の図で、骨接合用螺子をガイドピンに挿入している状態を示す図である。 [7] In view similar to FIG. 5 is a diagram showing a state of inserting the screw for osteosynthesis in the guide pin.
【図8】図5と同様の図で、骨接合用螺子を螺入している状態を示す図である。 [8] In view similar to FIG. 5 is a diagram showing a state of screwed a screw for osteosynthesis.
【図9】図5と同様の図で、骨接合用螺子を螺入した状態を示す図である。 [9] In view similar to FIG. 5 is a diagram showing a state in which screwed a screw for osteosynthesis.
【符号の説明】 DESCRIPTION OF SYMBOLS
1 螺子本体2 螺子部3 非螺子部5 中空孔6,6a,6b 透孔 1 threaded body 2 threaded portion 3 non threaded portion 5 hollow hole 6, 6a, 6b hole

Claims (5)

  1. 外周面に一端側から螺子部が形成された棒状の螺子本体に、該螺子本体を軸線方向に貫通する中空孔が形成されてなり、螺子部側から骨内に挿入されて骨に螺合させられる骨接合用螺子において、上記螺子本体の周壁には、内端が上記中空孔に連通し外端が外部に開放された複数の透孔が、該透孔の数および/または開口面積が螺子本体の上記一端に近付くにつれて大になるように、螺子本体の軸線方向及び周方向に離散して形成されてなることを特徴とする骨接合用螺子。 The rod-shaped screw body screw part is formed from one end side to the outer peripheral surface, made with hollow hole is formed to penetrate the 該螺Ko body in the axial direction, it is inserted into the bone screwed into the bone from the threaded portion side in osteosynthesis screw is, in the peripheral wall of the screw body, a plurality of through holes which the inner end communicating with the outer end in the hollow hole is opened to the outside, the number and / or opening areas of the translucent hole screw as becomes larger as it approaches the one end of the body, osteosynthesis screws, characterized by comprising formed discretely in the axial direction and the circumferential direction of the screw body.
  2. 上記複数の透孔が、前記螺子部に形成されていることを特徴とする請求項1に記載の骨接合用螺子。 Said plurality of holes is, osteosynthesis screws according to claim 1, characterized in that it is formed on the screw portion.
  3. 透孔が略円形の断面を有することを特徴とする請求項1または2に記載の骨接合用螺子。 Osteosynthesis screw according to claim 1 or 2, characterized in that the hole has a substantially circular cross-section.
  4. 透孔がスリット状の断面を有することを特徴とする請求項1または2に記載の骨接合用螺子。 Osteosynthesis screw according to claim 1 or 2, characterized in that the hole has a slit-shaped cross-section.
  5. 透孔が略長円形の断面を有することを特徴とする請求項1または2に記載の骨接合用螺子。 Osteosynthesis screw according to claim 1 or 2, characterized in that the hole has a substantially elliptic cross-section.
JP01949297A 1997-01-31 1997-01-31 Osteosynthesis screw Expired - Lifetime JP3575208B2 (en)

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