JP5799066B2 - Spine fixation device and spinal fixation system - Google Patents

Spine fixation device and spinal fixation system Download PDF

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JP5799066B2
JP5799066B2 JP2013200901A JP2013200901A JP5799066B2 JP 5799066 B2 JP5799066 B2 JP 5799066B2 JP 2013200901 A JP2013200901 A JP 2013200901A JP 2013200901 A JP2013200901 A JP 2013200901A JP 5799066 B2 JP5799066 B2 JP 5799066B2
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剛 瀬川
剛 瀬川
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Robert Reid Inc
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Description

本発明は、脊椎を固定するための脊椎固定装置及び脊椎固定システムに関する。   The present invention relates to a spinal fixation device and a spinal fixation system for fixing a spine.

従来、頸椎、腰椎などの脊椎の固定、矯正及び安定化等のために、外科手術として、椎骨に固定される脊椎固定装置にロッドを取付け固定することで、当該ロッドを脊椎に沿って配設する手法が知られている。   Conventionally, for fixing, correcting and stabilizing vertebrae such as cervical vertebra and lumbar vertebra, as a surgical operation, the rod is attached and fixed to a spinal fixation device fixed to the vertebra, and the rod is arranged along the spine. There is a known technique to do this.

この脊椎固定装置は、例えば、患者の脊椎疾患の状態や手術内容等に応じて使い分けされるように、ロッドが保持されるホルダー部と椎骨に埋め込まれる骨ねじとが一体となって形成され、ホルダー部と骨ねじとが相対的に回動不可の固定型の装置や、ホルダー部と骨ねじとが別体で形成され、ホルダー部と骨ねじとが相対的に回動可能な回動型の装置がある。   This spinal fixation device, for example, is formed integrally with a holder portion that holds the rod and a bone screw that is embedded in the vertebra so that it can be used properly according to the state of the spinal disease of the patient, the surgical content, etc. A fixed type device in which the holder part and the bone screw are relatively unrotatable, or a rotation type in which the holder part and the bone screw are formed separately and the holder part and the bone screw are relatively rotatable There is a device.

回動型の脊椎固定装置として、骨ねじの頭部及びロッドが保持されるホルダー部内に圧力要素を配設し、この圧力要素により骨ねじの頭部を押圧して当該頭部が旋回しないように保持する構成のものが知られている(例えば、特許文献1参照)。しかしながら、骨ねじの頭部はホルダー部内にて一時的に締め付けられた状態であるため、例えば、脊柱後弯症等の脊柱変形を矯正する手術の際に、ホルダー部や骨ねじに対して大きな負荷がかかると骨ねじとホルダー部との相対的な角度が変化してしまう虞がある。
そこで、圧力要素による骨ねじの頭部の押圧を維持するためのリングをホルダー部内に配設し、骨ねじとホルダー部との相対的な角度を固定することで、固定型の装置と略同等の機能を具備する脊椎固定装置も提案されている。
As a rotation type spinal fixation device, a pressure element is arranged in a holder portion that holds a bone screw head and a rod, and the pressure element presses the bone screw head so that the head does not turn. The thing of the structure hold | maintained is known (for example, refer patent document 1). However, since the head of the bone screw is temporarily tightened in the holder, for example, during surgery to correct spinal deformity such as kyphosis, a large load is applied to the holder and bone screw. If this is applied, the relative angle between the bone screw and the holder may change.
Therefore, a ring for maintaining the pressure of the head of the bone screw by the pressure element is arranged in the holder part, and the relative angle between the bone screw and the holder part is fixed, so that it is substantially equivalent to a fixed type device. A spinal fixation device having the above functions has also been proposed.

特開2011−206538号公報JP 2011-206538 A

しかしながら、圧力要素による骨ねじの頭部の押圧を維持するためのリングは、ロッドを固定するための固定用ねじとは別に設けられている。このため、脊椎固定装置の部品点数が増加して当該装置構成が複雑になるだけでなく、当該装置自体が大型化してしまうといった問題が生じる。さらに、リング及び固定用ねじをそれぞれ締め付けるための専用の治具も必要となる。結果として、当該装置の取扱性の悪化やコストアップを招いてしまうこととなる。   However, the ring for maintaining the pressure of the head of the bone screw by the pressure element is provided separately from the fixing screw for fixing the rod. For this reason, not only does the number of parts of the spinal fixation device increase and the configuration of the device becomes complicated, but also the device itself becomes large. Furthermore, a dedicated jig for fastening the ring and the fixing screw is also required. As a result, the handling property of the apparatus is deteriorated and the cost is increased.

本発明は、このような問題に鑑みてなされたものであり、本発明の課題は、より単純な構成で骨ねじと保持部との相対的な角度の固定を適正に行うことができる脊椎固定装置及び脊椎固定システムを提供することである。   This invention is made | formed in view of such a problem, and the subject of this invention is the spinal fixation which can fix appropriately the relative angle of a bone screw and a holding | maintenance part with a simpler structure. An apparatus and spinal fixation system are provided.

上記課題を解決するため、請求項1に記載の発明の脊椎固定装置は、
ロッドと接続されて脊椎を固定する脊椎固定装置であって、
前記脊椎を構成する椎骨に一部分が埋め込まれる長尺な埋込部材と、
前記埋込部材及び前記ロッドを保持可能な保持部と、を備え、
前記保持部は、
前記埋込部材の椎骨に埋め込まれない非埋込部が配置される非埋込部配置部を具備する内側部材と、
前記内側部材の外側に設けられ、前記非埋込部配置部の外面部の略全域と接触可能な内面部を具備する外側部材と、を有し、
前記非埋込部配置部は、その外面部に所定の一方向に沿って漸次縮径された第1のテーパー状の部分を具備するとともに、当該非埋込部配置部の内面部から外側に所定の深さ座刳られるように形成された肉薄部を具備してなり、
前記外側部材は、その内面部に前記所定の一方向に沿って漸次縮径された第2のテーパー状の部分を具備してなり、
前記内側部材が前記所定の一方向に前記外側部材に対して移動することで、前記外側部材の内面部の前記第2のテーパー状の部分と前記非埋込部配置部の外面部の前記第1のテーパー状の部分とを接触させ、この状態で、前記非埋込部配置部に配置された前記非埋込部を当該非埋込部配置部の内面部で押圧して、前記埋込部材と前記保持部との相対的な角度を固定するとともに、前記非埋込部の外面に形成されている凹部が前記非埋込部配置部の前記肉薄部の端部に係止可能となるように構成されていることを特徴としている。
In order to solve the above problem, the spinal fixation device of the invention according to claim 1 comprises:
A spinal fixation device connected to a rod to fix the spine,
A long implant member partially embedded in the vertebrae constituting the spine;
A holding portion capable of holding the embedded member and the rod,
The holding part is
An inner member comprising a non-implanted portion placement portion in which a non-implant portion that is not embedded in the vertebra of the implant member is disposed;
An outer member provided on the outer side of the inner member, and having an inner surface portion that can come into contact with substantially the entire outer surface portion of the non-embedded portion arrangement portion,
The non-embedded portion arrangement portion includes a first tapered portion that is gradually reduced in diameter along a predetermined direction on an outer surface portion thereof, and is formed outward from the inner surface portion of the non-embedded portion arrangement portion. It has a thin part formed so that it can be squeezed at a predetermined depth,
The outer member includes a second tapered portion that is gradually reduced in diameter along the predetermined direction on the inner surface thereof.
When the inner member moves in the predetermined direction with respect to the outer member, the second tapered portion of the inner surface portion of the outer member and the first surface of the outer surface portion of the non-embedded portion disposition portion . 1 in contact with the tapered portion, and in this state, the non-embedded portion arranged in the non-embedded portion arranging portion is pressed by the inner surface portion of the non-embedded portion arranged portion, thereby The relative angle between the member and the holding portion is fixed, and the concave portion formed on the outer surface of the non-embedded portion can be locked to the end portion of the thin portion of the non-embedded portion arrangement portion. It is configured as described above.

また、請求項に記載の発明は、請求項に記載の脊椎固定装置において、
前記非埋込部配置部は、前記所定の一方向に沿った軸を中心とする周方向に複数分離されてなり、
前記内側部材が前記所定の一方向に前記外側部材に対して移動することで、前記非埋込部配置部の分離された部分どうしの間隔を狭めるように当該非埋込部配置部が前記外側部材の内面部により締め付けられて前記非埋込部配置部の内面部で前記非埋込部を押圧することを特徴としている。
The invention according to claim 2 is the spinal fixation device according to claim 1 ,
The non-embedded portion arrangement portion is divided into a plurality of circumferential directions around an axis along the predetermined one direction,
When the inner member moves in the predetermined direction with respect to the outer member, the non-embedded portion arrangement portion is arranged on the outer side so as to reduce the interval between the separated portions of the non-embedded portion arrangement portion. The non-embedded portion is pressed by the inner surface portion of the non-embedded portion arrangement portion by being tightened by the inner surface portion of the member.

また、請求項3に記載の発明は、請求項1又は2に記載の脊椎固定装置において、
前記内側部材は、
前記非埋込部配置部が設けられた側と反対側に設けられ、前記ロッドが配置されるロッド配置部を更に具備し、
前記ロッド配置部に配置された前記ロッドが前記所定の一方向に押圧されることで、前記内側部材が当該所定の一方向に前記外側部材に対して移動し、前記外側部材の内面部の前記第2のテーパー状の部分と前記非埋込部配置部の外面部の前記第1のテーパー状の部分とが接触することを特徴としている。
The invention according to claim 3 is the spinal fixation device according to claim 1 or 2,
The inner member is
A rod arrangement part provided on the opposite side to the side where the non-embedding part arrangement part is provided, and further comprising a rod arrangement part on which the rod is arranged;
When the rod disposed in the rod placement portion is pressed in the predetermined direction, the inner member moves relative to the outer member in the predetermined direction, and the inner surface portion of the outer member moves. The second taper-shaped portion and the first taper-shaped portion of the outer surface portion of the non-embedded portion arrangement portion are in contact with each other.

また、請求項に記載の発明は、請求項に記載の脊椎固定装置において、
前記外側部材は、
前記ロッド配置部に配置された前記ロッドを固定するための固定用ねじが螺子込まれる固定用被螺合部を更に具備し、
前記固定用被螺合部に前記固定用ねじが螺子込まれることで、当該固定用ねじの先端部で前記ロッドを前記所定の一方向に押圧して固定するように構成されていることを特徴としている。
The invention according to claim 4 is the spinal fixation device according to claim 3 ,
The outer member is
A fixing screwed portion into which a fixing screw for fixing the rod arranged in the rod arrangement portion is screwed;
The fixing screw is screwed into the fixing threaded portion so that the rod is pressed and fixed in the predetermined direction at the tip of the fixing screw. It is said.

また、請求項に記載の発明は、請求項に記載の脊椎固定装置において、
前記埋込部材と前記保持部との相対的な角度を固定したまま、前記固定用被螺合部と前記固定用ねじとの螺合を解除可能に構成されていることを特徴としている。
The invention according to claim 5 is the spinal fixation device according to claim 4 ,
The fixing member is configured to be able to release the screwing between the fixing screwed portion and the fixing screw while fixing the relative angle between the embedded member and the holding portion.

また、請求項に記載の発明は、請求項1〜の何れか一項に記載の脊椎固定装置において、
前記埋込部材は、前記非埋込部が前記非埋込部配置部に着脱可能に構成されていることを特徴としている。
Moreover, invention of Claim 6 is a spinal fixation apparatus as described in any one of Claims 1-5 ,
The embedded member is characterized in that the non-embedded portion is configured to be detachable from the non-embedded portion arrangement portion.

また、請求項に記載の発明は、
椎固定装置と、固定解除装置と、を備える脊椎固定システムであって、
前記脊椎固定装置は、
ロッドと接続されて脊椎を固定するものであり、
前記脊椎を構成する椎骨に一部分が埋め込まれる長尺な埋込部材と、
前記埋込部材及び前記ロッドを保持可能な保持部と、を備え、
前記保持部は、
前記埋込部材の椎骨に埋め込まれない非埋込部が配置される非埋込部配置部を具備する内側部材と、
前記内側部材の外側に設けられ、前記非埋込部配置部の外面部と接触可能な内面部を具備する外側部材と、を有し、
前記外側部材の内面部と前記非埋込部配置部の外面部とを接触させた状態で、前記非埋込部配置部に配置された前記非埋込部を当該非埋込部配置部の内面部で押圧して、前記埋込部材と前記保持部との相対的な角度を固定するように構成され、
前記固定解除装置は、
前記埋込部材と前記保持部との相対的な角度の固定を解除するものであり、
前記外側部材の前記埋込部材と反対側の端部に接触して位置決めする位置決め部材と、
前記内側部材の前記非埋込部配置部が設けられた側と反対側に設けられた解除用被螺合部に螺子込まれる螺合部材と、を有し、
前記位置決め部材により当該固定解除装置が前記外側部材に対して位置決めされた状態で、前記螺合部材が前記内側部材の前記解除用被螺合部に螺子込まれることで、前記内側部材が前記外側部材に対して前記所定の一方向と反対方向に移動し、前記外側部材の内面部と前記非埋込部配置部の外面部との接触を解除するように構成されていることを特徴としている。
The invention according to claim 7
And vertebrate fixing device, a spinal fixation system comprising a solid and a constant release device, a
The spinal fixation device comprises:
It is connected to the rod to fix the spine,
A long implant member partially embedded in the vertebrae constituting the spine;
A holding portion capable of holding the embedded member and the rod,
The holding part is
An inner member comprising a non-implanted portion placement portion in which a non-implant portion that is not embedded in the vertebra of the implant member is disposed;
An outer member provided on the outer side of the inner member, and having an inner surface portion that can come into contact with an outer surface portion of the non-embedded portion arrangement portion,
In a state where the inner surface portion of the outer member and the outer surface portion of the non-embedded portion arrangement portion are in contact with each other, the non-embedded portion arranged in the non-embedded portion arrangement portion is changed to the non-embedded portion arrangement portion. It is configured to press the inner surface portion to fix the relative angle between the embedded member and the holding portion,
The fixing release device is
The fixing of the relative angle between the embedded member and the holding part is released,
A positioning member that contacts and positions an end of the outer member opposite to the embedded member;
A screwing member to be screwed into a release screwed part provided on the side opposite to the side on which the non-embedded part arrangement part of the inner member is provided,
When the fixing member is positioned with respect to the outer member by the positioning member, the screw member is screwed into the release screwed portion of the inner member, so that the inner member is moved to the outer member. It is configured to move in a direction opposite to the predetermined one direction with respect to the member, and to release contact between the inner surface portion of the outer member and the outer surface portion of the non-embedded portion arrangement portion. .

本発明によれば、より単純な構成で骨ねじと保持部との相対的な角度の固定を適正に行うことができる。   According to the present invention, the relative angle between the bone screw and the holding portion can be appropriately fixed with a simpler configuration.

本発明を適用した好適な一実施形態として例示する脊椎固定装置の概略構成を示す斜視図である。It is a perspective view showing a schematic structure of a spinal fixation device illustrated as a preferred embodiment to which the present invention is applied. 図1の脊椎固定装置の分解斜視図である。FIG. 2 is an exploded perspective view of the spinal fixation device of FIG. 1. 図1のIII−III線における脊椎固定装置の断面図である。It is sectional drawing of the spinal fixation apparatus in the III-III line of FIG. 図1の脊椎固定装置を構成するホルダー部の内側部材を示す図である。It is a figure which shows the inner member of the holder part which comprises the spinal fixation apparatus of FIG. 図1の脊椎固定装置を構成するホルダー部の外側部材を示す図である。It is a figure which shows the outer member of the holder part which comprises the spinal fixation apparatus of FIG. 図1の脊椎固定装置を構成する固定用ねじを示す図である。It is a figure which shows the screw for fixation which comprises the spinal fixation apparatus of FIG. 図1の脊椎固定装置を構成する骨ねじとホルダー部との相対的な角度の固定方法を説明する図である。It is a figure explaining the fixing method of the relative angle of the bone screw which comprises the spinal fixation apparatus of FIG. 1, and a holder part. 図1の脊椎固定装置を構成する骨ねじとホルダー部との相対的な角度が固定された状態での当該脊椎固定装置の使用方法を説明する図である。It is a figure explaining the usage method of the said spinal fixation apparatus in the state with which the relative angle of the bone screw and holder part which comprises the spinal fixation apparatus of FIG. 1 was fixed. 本発明を適用した好適な一実施形態として例示する固定解除装置の分解斜視図である。1 is an exploded perspective view of a fixing release device exemplified as a preferred embodiment to which the present invention is applied. 図9の固定解除装置を用いた骨ねじとホルダー部との相対的な角度の固定解除を説明する片側断面図である。FIG. 10 is a one-side cross-sectional view illustrating the unlocking of the relative angle between the bone screw and the holder using the unlocking device of FIG. 9.

以下に、本発明について、図面を用いて具体的な態様を説明する。ただし、発明の範囲は、図示例に限定されない。
図1は、本発明を適用した好適な一実施形態として例示する脊椎固定装置100の概略構成を示す斜視図である。また、図2は、脊椎固定装置100の分解斜視図であり、図3は、図1のIII−III線における脊椎固定装置100の断面図である。
なお、以下の説明では、脊椎固定装置100が脊椎V(図8参照)の椎骨Bに取り付けられた状態で、脊椎Vの延在方向(椎骨Bの並び方向)に沿う方向をY軸方向とし、Y軸方向に略直交し、人体の左右方向と略平行な一方向をX軸方向とし、X軸方向及びY軸方向に略直交する一方向(上下方向)をZ軸方向とする。
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
FIG. 1 is a perspective view showing a schematic configuration of a spinal fixation device 100 exemplified as a preferred embodiment to which the present invention is applied. 2 is an exploded perspective view of the spinal fixation device 100, and FIG. 3 is a cross-sectional view of the spinal fixation device 100 taken along line III-III in FIG.
In the following description, in a state where the spinal fixation device 100 is attached to the vertebra B of the spine V (see FIG. 8), the direction along the extending direction of the spine V (the alignment direction of the vertebra B) is defined as the Y-axis direction. One direction substantially perpendicular to the Y-axis direction and substantially parallel to the left-right direction of the human body is taken as the X-axis direction, and one direction (vertical direction) substantially perpendicular to the X-axis direction and the Y-axis direction is taken as the Z-axis direction.

本実施形態の脊椎固定装置100は、例えば、腰椎などの脊椎Vの固定、矯正及び安定化等のため、Y軸方向に並んだ複数の椎骨B、…の各々に2つずつ固定されて略円柱状のロッドR2本を脊椎Vに沿って配設させるものである。
具体的には、図1〜図3に示すように、脊椎固定装置100は、椎骨Bに螺子込まれる骨ねじ1と、この骨ねじ1及びロッドRが取付け固定されるホルダー部2と、このホルダー部2に螺子込まれる固定用ねじ3とを備えている。
The spinal fixation device 100 according to the present embodiment is substantially fixed by fixing two to each of a plurality of vertebrae B arranged in the Y-axis direction in order to fix, correct and stabilize the spine V such as a lumbar vertebra. Two cylindrical rods R are arranged along the spine V.
Specifically, as shown in FIGS. 1 to 3, the spinal fixation device 100 includes a bone screw 1 screwed into the vertebra B, a holder portion 2 to which the bone screw 1 and the rod R are attached and fixed, A fixing screw 3 to be screwed into the holder portion 2 is provided.

骨ねじ1は、椎骨Bに少なくとも一部が埋め込まれるものである。具体的には、骨ねじ1は、埋め込み方向(例えば、Z軸方向)に沿うように長尺に形成され、椎骨Bに螺子込まれるねじ本体部11を有している。このねじ本体部11の長手方向の一端側、即ち、当該脊椎固定装置100が脊椎Vに取り付けられた状態で椎骨Bと反対となる皮膚側に、椎骨Bに埋め込まれないねじ頭部(非埋込部)12が形成されている。   The bone screw 1 is at least partially embedded in the vertebra B. Specifically, the bone screw 1 is formed in a long shape so as to be along the embedding direction (for example, the Z-axis direction), and has a screw main body portion 11 that is screwed into the vertebra B. A screw head that is not embedded in the vertebra B (non-embedded) on one end side in the longitudinal direction of the screw main body 11, that is, on the skin side opposite to the vertebra B when the spinal fixation device 100 is attached to the spine V. ) 12 is formed.

ねじ頭部12は、例えば、ねじ本体部11に連続して形成された球体を当該骨ねじ1の軸方向に略直交する平面で切断した一部分から形成されている。また、ねじ頭部12のねじ本体部11と反対側の平面部には、当該骨ねじ1を回転させて椎骨Bに埋め込むための埋込装置(図示略)が取り付けられる取付部13が形成されている。   The screw head 12 is formed, for example, from a part obtained by cutting a sphere formed continuously with the screw main body 11 along a plane substantially orthogonal to the axial direction of the bone screw 1. In addition, a mounting portion 13 to which an implanting device (not shown) for rotating the bone screw 1 to be embedded in the vertebra B is attached to the plane portion opposite to the screw main body portion 11 of the screw head 12. ing.

また、ねじ頭部12の外周面には、環状の凹部14が複数設けられている。
複数の凹部14、…は、骨ねじ1の中心軸を中心とする周方向に延在するように形成されている。具体的には、複数の凹部14、…は、ねじ頭部12の当該骨ねじ1の軸方向の略中央部よりもねじ本体部11側及び取付部13側に、所定数ずつ骨ねじ1の軸方向に所定間隔を空けて形成されている。つまり、ねじ頭部12の骨ねじ1の軸方向の略中央部付近、特に、中央部から取付部13寄りの領域は、凹部14が形成されずに、曲面状に形成されている。
これにより、ねじ頭部12の外周面の曲面状に形成された部分とねじ頭配置部211の曲面部211a(後述)との接触面積をより広く確保することができる。
A plurality of annular recesses 14 are provided on the outer peripheral surface of the screw head 12.
The plurality of recesses 14 are formed so as to extend in the circumferential direction around the central axis of the bone screw 1. Specifically, the plurality of recesses 14,... Are formed by a predetermined number of bone screws 1 on the screw main body 11 side and the attachment portion 13 side from the substantially central portion in the axial direction of the bone screw 1 of the screw head 12. They are formed at predetermined intervals in the axial direction. That is, the vicinity of the axial direction of the bone screw 1 of the screw head 12 in the axial direction, in particular, the region near the mounting portion 13 from the central portion is formed in a curved surface shape without the concave portion 14 being formed.
Thereby, the contact area of the part formed in the curved surface shape of the outer peripheral surface of the screw head 12, and the curved surface part 211a (after-mentioned) of the screw head arrangement | positioning part 211 can be ensured more widely.

ホルダー部2は、保持部として、骨ねじ1及びロッドRを保持可能に構成されている。具体的には、ホルダー部2は、骨ねじ1のねじ頭部12が配置される内側部材21(図4(a)等参照)と、この内側部材21の外側に設けられた外側部材22(図5(a)等参照)とを有している。   The holder portion 2 is configured to be able to hold the bone screw 1 and the rod R as a holding portion. Specifically, the holder portion 2 includes an inner member 21 (see FIG. 4A and the like) in which the screw head 12 of the bone screw 1 is disposed, and an outer member 22 (see FIG. 4A). 5 (a) and the like).

図4(a)は、ホルダー部2を構成する内側部材21を示す斜視図であり、図4(b)は、図4(a)のIV−IV線における内側部材21の断面図である。
図4(a)及び図4(b)に示すように、内側部材21は、例えば、全体として略筒状に形成され、骨ねじ1の椎骨Bに埋め込まれないねじ頭部12が配置されるねじ頭配置部(非埋込部配置部)211と、内側にロッドRが配置される内側ロッド配置部212と、固定解除装置200の螺合部材201が螺子込まれる解除用雌ねじ部213とを有している。
4A is a perspective view showing the inner member 21 constituting the holder portion 2, and FIG. 4B is a cross-sectional view of the inner member 21 taken along line IV-IV in FIG. 4A.
As shown in FIGS. 4A and 4B, the inner member 21 is formed in a substantially cylindrical shape as a whole, for example, and a screw head 12 that is not embedded in the vertebra B of the bone screw 1 is disposed. A screw head arrangement portion (non-embedding portion arrangement portion) 211, an inner rod arrangement portion 212 in which the rod R is arranged on the inner side, and a release female screw portion 213 into which the screwing member 201 of the fixing release device 200 is screwed. Have.

ねじ頭配置部211は、内側部材21における当該脊椎固定装置100が脊椎Vに取り付けられた状態で椎骨B側となる一方の開口側に形成されている。また、ねじ頭配置部211は、骨ねじ1のねじ頭部12の曲率と略等しい曲率で略円弧状に湾曲して形成された環状の曲面部211aと、この曲面部211aよりも椎骨B側に形成された複数の分離片部211b、…とを有している。   The screw head arrangement portion 211 is formed on one opening side which is the vertebra B side in a state where the spinal fixation device 100 in the inner member 21 is attached to the spine V. The screw head placement portion 211 includes an annular curved surface portion 211a formed by being curved in a substantially arc shape with a curvature substantially equal to the curvature of the screw head 12 of the bone screw 1, and the vertebra B side from the curved surface portion 211a. Have a plurality of separation piece portions 211b,.

分離片部211bは、ねじ頭配置部211の椎骨B側(図4(b)における下側)の開口端からZ軸方向に沿って皮膚側(図4(b)における上側)に略等しい間隔で所定数(例えば、6つ)切り欠かれることで形成されている。つまり、ねじ頭配置部211は、複数の分離片部211b、…によりZ軸方向に沿った軸を中心とする周方向に複数分離されている。
また、分離片部211bの内面部は、骨ねじ1のねじ頭部12の曲率と略等しい曲率で略円弧状に湾曲して形成されている。
The separation piece portion 211b is substantially equal to the skin side (upper side in FIG. 4B) from the opening end of the screw head placement portion 211 on the vertebra B side (lower side in FIG. 4B) along the Z-axis direction. And a predetermined number (for example, six) is cut out. That is, a plurality of screw head arrangement portions 211 are separated in the circumferential direction around the axis along the Z-axis direction by a plurality of separation piece portions 211b,.
Further, the inner surface portion of the separation piece portion 211b is formed to be curved in a substantially arc shape with a curvature substantially equal to the curvature of the screw head 12 of the bone screw 1.

また、分離片部211bの基端部と曲面部211aとの間の領域には、Z軸方向に略直交する方向の厚さが他の部分に対して薄く形成された肉薄部211cが設けられている。具体的には、ねじ頭配置部211における分離片部211bの基端部と曲面部211aとの境目部分が、その内面からZ軸方向に略直交する方向の外側に所定の深さ座刳られるようにして肉薄部211cが形成されている。
これにより、複数の分離片部211b、…の先端部側が、基端部側を軸としてZ軸方向に略直交する方向に変位可能となっている。
In addition, a thin portion 211c is formed in a region between the base end portion of the separation piece portion 211b and the curved surface portion 211a. ing. Specifically, the boundary portion between the base end portion of the separation piece portion 211b and the curved surface portion 211a in the screw head arrangement portion 211 is scooped by a predetermined depth from the inner surface thereof in the direction substantially perpendicular to the Z-axis direction. In this way, the thin portion 211c is formed.
Thereby, the front end side of the plurality of separation piece portions 211b,... Can be displaced in a direction substantially orthogonal to the Z-axis direction with the base end side as an axis.

さらに、複数の分離片部211b、…が変位していない状態では、分離片部211bの椎骨B側の開口端の内径は、骨ねじ1のねじ頭部12の外径よりも小径に形成されている。一方、複数の分離片部211b、…がZ軸方向に略直交する方向の外側に開くように変位した状態では、分離片部211bの椎骨B側の開口端の内径は、骨ねじ1のねじ頭部12の外径と略等しいか、或いは、ねじ頭部12の外径よりも大径となるようになっている。
これにより、複数の分離片部211b、…の椎骨B側の開口端側から当該複数の分離片部211b、…をZ軸方向に略直交する方向の外側に広げるようにして骨ねじ1のねじ頭部12を押し込むことで、ねじ頭配置部211の内側にねじ頭部12を配置可能となっている。この状態で、骨ねじ1のねじ頭部12の中心が肉薄部211の分離片部211bの基端部側の端部よりも曲面部211a側に位置するように当該ねじ頭部12が配置された状態となるとともに、複数の分離片部211b、…はZ軸方向に略直交する方向の内側に向けて付勢された状態となり、ねじ頭部12が一時的に抜け止めされる。
一方、複数の分離片部211b、…をZ軸方向に略直交する方向の外側に広げるようにして骨ねじ1のねじ頭部12を引き抜くことで、ねじ頭配置部211の内側からねじ頭部12を取り外し可能となっている。
Further, in a state where the plurality of separation piece portions 211b,... Are not displaced, the inner diameter of the opening end on the vertebra B side of the separation piece portion 211b is formed smaller than the outer diameter of the screw head 12 of the bone screw 1. ing. On the other hand, in a state where the plurality of separation piece portions 211b,... Are displaced so as to open outward in a direction substantially perpendicular to the Z-axis direction, the inner diameter of the opening end on the vertebra B side of the separation piece portion 211b is the screw of the bone screw 1. The outer diameter of the head portion 12 is substantially equal to or larger than the outer diameter of the screw head portion 12.
Thus, the screws of the bone screw 1 so as to spread the plurality of separation pieces 211b,... From the opening end side on the vertebra B side of the plurality of separation pieces 211b,. By pushing the head 12, the screw head 12 can be placed inside the screw head placement portion 211. In this state, the screw head 12 is arranged so that the center of the screw head 12 of the bone screw 1 is positioned closer to the curved surface portion 211a than the proximal end portion of the separation piece 211b of the thin portion 211. The plurality of separation piece portions 211b are urged toward the inside in the direction substantially perpendicular to the Z-axis direction, and the screw head 12 is temporarily prevented from coming off.
On the other hand, by pulling out the screw head 12 of the bone screw 1 so that the plurality of separating pieces 211b,... Are spread outward in a direction substantially orthogonal to the Z-axis direction, 12 is removable.

このように、骨ねじ1はホルダー部2に対する相対的な角度が固定されていない状態で、当該骨ねじ1のねじ頭部12がねじ頭配置部211に着脱可能に構成されている。
なお、骨ねじ1とホルダー部2との相対的な角度の固定方法については後述する。
Thus, the bone screw 1 is configured such that the screw head 12 of the bone screw 1 can be attached to and detached from the screw head arrangement portion 211 in a state where the relative angle with respect to the holder portion 2 is not fixed.
A method for fixing the relative angle between the bone screw 1 and the holder portion 2 will be described later.

また、ねじ頭配置部211の複数の分離片部211b、…の外面部211dは、その先端部側が基端部側に対して内向きに傾斜するような形状に形成されている。
即ち、内側部材21のうち、ねじ頭配置部211の分離片部211bよりも皮膚側の部分の外形は、Z軸方向に略直交する方向の外径が略等しい略円筒状に形成されているのに対して、複数の分離片部211b、…の外面部211dは、Z軸方向に沿って椎骨B側の開口に近付くほど外径が漸次縮径されたテーパー状に形成されている。
Further, the outer surface portions 211d of the plurality of separation piece portions 211b,... Of the screw head arrangement portion 211 are formed in such a shape that the distal end side is inclined inward with respect to the proximal end side.
That is, of the inner member 21, the outer shape of the portion on the skin side of the separation piece portion 211b of the screw head arrangement portion 211 is formed in a substantially cylindrical shape having substantially the same outer diameter in a direction substantially perpendicular to the Z-axis direction. On the other hand, the outer surface portions 211d of the plurality of separation piece portions 211b,... Are formed in a tapered shape whose outer diameter is gradually reduced toward the vertebra B side opening along the Z-axis direction.

内側ロッド配置部212は、内側部材21におけるねじ頭配置部211と反対側、即ち、当該脊椎固定装置100が脊椎Vに取り付けられた状態で椎骨B側と反対となる皮膚側に形成されている。また、内側ロッド配置部212は、内側部材21の皮膚側の開口端からZ軸方向に沿って椎骨B側に所定の深さ切り欠かれて形成されている。具体的には、筒状をなす内側部材21の側壁部214が断面視略「U」字状に切り欠かれることで(図4(b)参照)、内側にロッドRが配置される内側ロッド配置部212が形成されている。
また、内側ロッド配置部212をなすZ軸方向に略直交配置された側壁部214どうしの間隔は、ロッドRの外径と略等しいか、或いは、当該ロッドRの外径よりもわずかに大きくなっている。また、内側ロッド配置部212の椎骨B側の端部の内面は、ロッドRの外周面と接触可能となるように、ロッドRの外周面と略等しい曲率で略半円形状に湾曲して形成されている。
The inner rod placement portion 212 is formed on the side opposite to the screw head placement portion 211 in the inner member 21, that is, on the skin side opposite to the vertebra B side when the spinal fixation device 100 is attached to the spine V. . In addition, the inner rod placement portion 212 is formed by cutting a predetermined depth from the skin-side opening end of the inner member 21 toward the vertebra B along the Z-axis direction. Specifically, an inner rod in which the rod R is disposed on the inner side by cutting the side wall portion 214 of the inner member 21 having a cylindrical shape into a substantially “U” shape in a cross-sectional view (see FIG. 4B). An arrangement portion 212 is formed.
Further, the interval between the side wall portions 214 arranged substantially orthogonal to the Z-axis direction forming the inner rod arrangement portion 212 is substantially equal to the outer diameter of the rod R or slightly larger than the outer diameter of the rod R. ing. In addition, the inner surface of the end portion on the vertebra B side of the inner rod placement portion 212 is formed in a substantially semicircular shape with a curvature substantially equal to the outer peripheral surface of the rod R so as to be in contact with the outer peripheral surface of the rod R. Has been.

また、内側ロッド配置部212の皮膚側の端部には、外側部材22に対する抜け止め用の板状部215が所定数(例えば、4つ)形成されている。即ち、当該板状部215が外側部材22に形成されているガイド溝225(図5(a)等参照)と係合することで、当該内側部材21と外側部材22とのZ軸方向に沿った相対的な移動を案内しつつ、内側部材21が外側部材22に対して抜けるのを防止可能となっている。   In addition, a predetermined number (for example, four) of plate-like portions 215 for preventing the outer member 22 from coming off are formed at the skin side end of the inner rod placement portion 212. That is, the plate-like portion 215 is engaged with a guide groove 225 (see FIG. 5A, etc.) formed in the outer member 22 so that the inner member 21 and the outer member 22 extend along the Z-axis direction. It is possible to prevent the inner member 21 from coming out of the outer member 22 while guiding the relative movement.

解除用雌ねじ部213は、内側ロッド配置部212をなすZ軸方向に略直交する二つの側壁部214、214の内面、即ち、内側部材21の側壁部214のうちの断面視略「U」字状に切り欠かれていない部分に形成されている。具体的には、解除用雌ねじ部213は、内側ロッド配置部212の二つの側壁部214、214の内面からZ軸方向に略直交する方向の外側に所定の深さ座刳られるようにして形成された所定ピッチのねじ山を有している。
そして、固定解除装置200(後述)を用いて骨ねじ1とホルダー部2との相対的な角度の固定を解除する際に、当該解除用雌ねじ部213は、固定解除装置200の螺合部材201の外周面に形成された雄ねじ部201aが螺入されるようになっている。
なお、骨ねじ1とホルダー部2との相対的な角度の固定解除については後述する。
The internal thread portion 213 for release is substantially “U” in cross-sectional view of the inner surfaces of the two side wall portions 214, 214 that are substantially orthogonal to the Z-axis direction forming the inner rod arrangement portion 212, that is, the side wall portion 214 of the inner member 21. It is formed in the part which is not cut out in the shape. Specifically, the release female thread portion 213 is formed so as to be seated at a predetermined depth from the inner surfaces of the two side wall portions 214 and 214 of the inner rod placement portion 212 on the outer side in a direction substantially perpendicular to the Z-axis direction. And have a predetermined pitch thread.
Then, when the fixation of the relative angle between the bone screw 1 and the holder portion 2 is released using the fixation release device 200 (described later), the release female screw portion 213 is used as the screwing member 201 of the fixation release device 200. The external thread part 201a formed in the outer peripheral surface of is screwed.
The release of the relative angle between the bone screw 1 and the holder portion 2 will be described later.

図5(a)は、ホルダー部2を構成する外側部材22を示す斜視図であり、図5(b)は、図5(a)のV−V線における外側部材22の断面図である。
図5(a)及び図5(b)に示すように、外側部材22は、例えば、全体として略筒状に形成され、内側部材21を収納する収納部221と、内側にロッドRが配置される外側ロッド配置部222と、固定用ねじ3が螺子込まれる固定用雌ねじ部223とを有している。
Fig.5 (a) is a perspective view which shows the outer member 22 which comprises the holder part 2, FIG.5 (b) is sectional drawing of the outer member 22 in the VV line | wire of Fig.5 (a).
As shown in FIGS. 5A and 5B, the outer member 22 is formed, for example, in a substantially cylindrical shape as a whole, and a storage portion 221 that stores the inner member 21 and a rod R disposed inside. And a fixing female screw portion 223 into which the fixing screw 3 is screwed.

収納部221は、内側部材21の外面部の形状と略等しい形状の内面部221aを有している。具体的には、収納部221の内面部221aのうち、椎骨B側の開口側の部分は、内側部材21の複数の分離片部211b、…に対応させて内向きに傾斜するような形状に形成されている。即ち、収納部221の内面部221aは、Z軸方向に沿って椎骨B側の開口に近付くほど内径が漸次縮径されたテーパー状に形成されている。
また、収納部221の内面部221aのうち、テーパー状に形成された部分よりも皮膚側の部分は、内側部材21の円筒状の部分に対応させてZ軸方向に略直交する方向の内径がZ軸方向に略等しくなるように形成されている。
The storage part 221 has an inner surface part 221 a having a shape substantially equal to the shape of the outer surface part of the inner member 21. Specifically, of the inner surface portion 221a of the storage portion 221, the portion on the opening side on the vertebra B side is shaped to be inclined inward corresponding to the plurality of separation piece portions 211b of the inner member 21. Is formed. That is, the inner surface portion 221a of the storage portion 221 is formed in a tapered shape whose inner diameter is gradually reduced toward the vertebra B side opening along the Z-axis direction.
Further, in the inner surface portion 221a of the storage portion 221, the portion on the skin side with respect to the tapered portion has an inner diameter in a direction substantially orthogonal to the Z-axis direction corresponding to the cylindrical portion of the inner member 21. It is formed to be substantially equal in the Z-axis direction.

また、収納部221の内面部221aのZ軸方向の長さは、内側部材21の同方向の長さよりも長くなっている。また、収納部221の内面部221aのうち、椎骨B側の開口側のテーパー状の部分の内径は、内側部材21の複数の分離片部211b、…の外径と略等しいか、或いは、当該外径よりもわずかに大きくなっているとともに、収納部221の内面部221aのうち、テーパー状の部分よりも皮膚側の部分の内径は、内側部材21の円筒状の部分の外径と略等しいか、或いは、当該内側部材21の外径よりもわずかに大きくなっている。
これにより、収納部221に収納された内側部材21は、当該内側部材21の外面部を収納部221の内面部221aに摺接させながらZ軸方向に外側部材22に対して相対的に移動可能となっている。つまり、収納部221の内面部221aと内側部材21のねじ頭配置部211の外面部211dとは接触可能となっている。
Further, the length in the Z-axis direction of the inner surface portion 221 a of the storage portion 221 is longer than the length in the same direction of the inner member 21. Moreover, the inner diameter of the tapered portion on the opening side on the vertebra B side of the inner surface portion 221a of the storage portion 221 is substantially equal to the outer diameter of the plurality of separation piece portions 211b of the inner member 21, or the While being slightly larger than the outer diameter, the inner diameter of the inner surface portion 221a of the storage portion 221 on the skin side with respect to the tapered portion is substantially equal to the outer diameter of the cylindrical portion of the inner member 21. Alternatively, it is slightly larger than the outer diameter of the inner member 21.
Thereby, the inner member 21 accommodated in the accommodating portion 221 can move relative to the outer member 22 in the Z-axis direction while sliding the outer surface portion of the inner member 21 to the inner surface portion 221a of the accommodating portion 221. It has become. That is, the inner surface portion 221a of the storage portion 221 and the outer surface portion 211d of the screw head arrangement portion 211 of the inner member 21 can be contacted.

外側ロッド配置部222は、外側部材22の皮膚側の開口端からZ軸方向に沿って椎骨B側に所定の深さ切り欠かれて形成されている。具体的には、筒状をなす外側部材22の側壁部224が断面視略「U」字状に切り欠かれることで(図5(b)参照)、内側にロッドRが配置される外側ロッド配置部222が形成されている。
また、外側ロッド配置部222のZ軸方向に略直交配置された側壁部224どうしの間隔は、ロッドRの外径と略等しいか、或いは、当該ロッドRの外径よりもわずかに大きくなっている。また、外側ロッド配置部222の椎骨B側の端部の内面は、ロッドRの外周面と接触可能となるように、ロッドRの外周面と略等しい曲率で略半円形状に湾曲して形成されている。
The outer rod placement portion 222 is formed by cutting out a predetermined depth from the skin-side opening end of the outer member 22 to the vertebra B side along the Z-axis direction. Specifically, the outer side rod 224 is arranged on the inner side by cutting the side wall 224 of the cylindrical outer member 22 into a substantially “U” shape in cross section (see FIG. 5B). An arrangement portion 222 is formed.
In addition, the interval between the side wall portions 224 arranged substantially orthogonal to the Z-axis direction of the outer rod arrangement portion 222 is substantially equal to the outer diameter of the rod R, or slightly larger than the outer diameter of the rod R. Yes. Further, the inner surface of the end portion on the vertebra B side of the outer rod arrangement portion 222 is formed to be curved in a substantially semicircular shape with substantially the same curvature as the outer peripheral surface of the rod R so as to be able to contact the outer peripheral surface of the rod R. Has been.

固定用雌ねじ部223は、外側ロッド配置部222をなすZ軸方向に略直交する二つの側壁部224、224の内面、即ち、外側部材22の側壁部224のうちの断面視略「U」字状に切り欠かれていない部分に形成されている。具体的には、固定用雌ねじ部223は、収納部221の皮膚側の端部に連続して形成され、外側ロッド配置部222の二つの側壁部224、224の内面からZ軸方向に略直交する方向の外側に所定の深さ座刳られるようにして形成された所定ピッチのねじ山を有している。
そして、固定用雌ねじ部223は、固定用ねじ3の外周面に形成された雄ねじ部31(後述)が螺入されるようになっている。
The internal thread portion 223 for fixing is substantially “U” -shaped in cross-sectional view of the inner surfaces of the two side wall portions 224 and 224 that are substantially orthogonal to the Z-axis direction forming the outer rod arrangement portion 222, that is, the side wall portion 224 of the outer member 22. It is formed in the part which is not cut out in the shape. Specifically, the fixing female screw portion 223 is formed continuously from the skin-side end portion of the storage portion 221, and is substantially orthogonal to the Z-axis direction from the inner surfaces of the two side wall portions 224 and 224 of the outer rod placement portion 222. A thread having a predetermined pitch formed so as to be squeezed at a predetermined depth on the outer side in the direction in which it is made.
And the external thread part 31 (after-mentioned) formed in the outer peripheral surface of the fixation screw 3 is screwed in the internal thread part 223 for fixation.

図6(a)は、固定用ねじ3をZ軸方向に略直交する方向(例えば、Y軸方向)に視て示す側面図であり、図6(b)は、固定用ねじ3をZ軸方向に椎骨B側(下側)から視て示す底面図である。
図6(a)及び図6(b)に示すように、固定用ねじ3は、その外周面にホルダー部2の外側部材22の固定用雌ねじ部223と螺合する雄ねじ部31が形成されている。
6A is a side view showing the fixing screw 3 viewed in a direction substantially perpendicular to the Z-axis direction (for example, the Y-axis direction), and FIG. 6B is a side view showing the fixing screw 3 in the Z-axis direction. It is a bottom view shown from the vertebra B side (lower side) in the direction.
As shown in FIG. 6A and FIG. 6B, the fixing screw 3 has a male screw portion 31 that is screwed with the fixing female screw portion 223 of the outer member 22 of the holder portion 2 on the outer peripheral surface thereof. Yes.

雄ねじ部31は、所定ピッチのねじ山を有し、固定用雌ねじ部223のねじ山と螺合可能となっている。また、雄ねじ部31の固定用雌ねじ部223に対する螺入開始位置となる先端部(不完全なねじ山部分の先端部)は、Z軸方向に沿った軸を中心とする周方向に凹むように切り欠かれている(図6(b)参照)。これにより、固定用ねじ3の雄ねじ部31を固定用雌ねじ部223に螺入し易くなっている。
なお、雄ねじ部31及び対応する固定用雌ねじ部223の断面形状は、例えば、所謂、アリ溝状に形成されていても良く、これにより、固定用ねじ3による締結を緩み難くすることができる。特に、例えば、腰椎を当該脊椎固定装置100を用いて固定する場合等に固定用雌ねじ部223の断面形状をアリ溝状に形成するのが好ましい。
The male thread portion 31 has a thread with a predetermined pitch, and can be screwed with the thread of the female thread portion 223 for fixing. In addition, the front end portion (the front end portion of the incomplete screw thread portion) that becomes the screwing start position of the male screw portion 31 with respect to the fixing female screw portion 223 is recessed in the circumferential direction around the axis along the Z-axis direction. It is cut away (see FIG. 6B). Thereby, the male screw portion 31 of the fixing screw 3 can be easily screwed into the fixing female screw portion 223.
Note that the cross-sectional shapes of the male screw portion 31 and the corresponding fixing female screw portion 223 may be formed in a so-called dovetail shape, for example, so that the fastening by the fixing screw 3 can be made difficult to loosen. In particular, for example, when the lumbar vertebra is fixed using the spine fixing device 100, the cross-sectional shape of the fixing female screw portion 223 is preferably formed in a dovetail shape.

また、固定用ねじ3の皮膚側の端部には、当該固定用ねじ3を回転させるためのスクリュードライバ等の所定の回転部材が取り付けられる回転部材取付部32が設けられている(図3等参照)。   Further, a rotation member attachment portion 32 to which a predetermined rotation member such as a screw driver for rotating the fixation screw 3 is attached is provided at the skin side end of the fixation screw 3 (FIG. 3 and the like). reference).

また、固定用ねじ3が外側部材22の固定用雌ねじ部223に螺子込まれることで、当該固定用ねじ3の椎骨B側の平面部(先端部)33で内側ロッド配置部212及び外側ロッド配置部222に配置されたロッドRをZ軸方向椎骨B側(所定の一方向)に押圧して固定するように構成されている。
即ち、回転部材取付部32に所定の回転部材が取り付けられた状態で、固定用ねじ3がZ軸方向に沿った軸を中心として所定方向に回転することで、当該固定用ねじ3の雄ねじ部31が固定用雌ねじ部223に螺子込まれていく。そして、固定用ねじ3の平面部33がロッドRの外周面の皮膚側に臨ませた面と接触し、当該ロッドRが椎骨B側に押圧されることで、内側ロッド配置部212及び外側ロッド配置部222と固定用ねじ3とにより、ロッドRがホルダー部2に固定された状態となる(図1等参照)。
Further, when the fixing screw 3 is screwed into the fixing female screw portion 223 of the outer member 22, the inner rod placement portion 212 and the outer rod placement are arranged at the flat portion (tip portion) 33 on the vertebra B side of the fixing screw 3. The rod R arranged in the portion 222 is configured to be pressed and fixed to the Z-axis direction vertebra B side (predetermined one direction).
That is, in a state where the predetermined rotating member is attached to the rotating member attaching portion 32, the fixing screw 3 rotates in a predetermined direction around the axis along the Z-axis direction, whereby the male screw portion of the fixing screw 3 is obtained. 31 is screwed into the fixing female screw portion 223. The flat portion 33 of the fixing screw 3 comes into contact with the surface of the outer peripheral surface of the rod R facing the skin side, and the rod R is pressed toward the vertebra B side, whereby the inner rod placement portion 212 and the outer rod The rod R is fixed to the holder portion 2 by the arrangement portion 222 and the fixing screw 3 (see FIG. 1 and the like).

このとき、内側ロッド配置部212に配置されたロッドRがZ軸方向椎骨B側に押圧されることで、内側部材21がZ軸方向椎骨B側に外側部材22に対して相対的に移動し、外側部材22の収納部221の椎骨B側の内面部221aとねじ頭配置部211の複数の分離片部211b、…の外面部211dとが接触して、ねじ頭配置部211に配置された骨ねじ1のねじ頭部12を当該ねじ頭配置部211の内面部で押圧するようになっている(図7(b)参照)。
即ち、固定用ねじ3によりロッドRがZ軸方向椎骨B側に押圧されていない場合、ロッドRの外周面は内側部材21の内側ロッド配置部212の椎骨B側の端部の内面に接触するが、外側部材22の外側ロッド配置部222の椎骨B側の端部の内面に接触していない状態となっている(図7(a)参照)。この状態で、固定用ねじ3によりロッドRがZ軸方向椎骨B側に押圧されていくと、内側ロッド配置部212を介して内側部材21をZ軸方向椎骨B側に外側部材22に対して相対的に移動させる。固定用ねじ3により押圧されるロッドRの外周面が外側ロッド配置部222の椎骨B側の端部の内面に接触することで、内側部材21の外側部材22に対する相対的な移動が停止する。
At this time, the rod R arranged in the inner rod placement portion 212 is pressed toward the Z-axis direction vertebra B, so that the inner member 21 moves relative to the outer member 22 toward the Z-axis direction vertebra B. The inner surface portion 221a on the vertebra B side of the storage portion 221 of the outer member 22 and the outer surface portions 211d of the plurality of separation piece portions 211b of the screw head placement portion 211 are in contact with each other and placed on the screw head placement portion 211. The screw head 12 of the bone screw 1 is pressed by the inner surface of the screw head arrangement portion 211 (see FIG. 7B).
That is, when the rod R is not pressed to the Z-axis direction vertebra B side by the fixing screw 3, the outer peripheral surface of the rod R contacts the inner surface of the end portion of the inner rod placement portion 212 of the inner member 21 on the vertebra B side. However, it is in the state which is not contacting the inner surface of the edge part by the side of the vertebra B of the outer side rod arrangement | positioning part 222 of the outer side member 22 (refer Fig.7 (a)). In this state, when the rod R is pressed toward the Z-axis direction vertebra B by the fixing screw 3, the inner member 21 is moved toward the Z-axis direction vertebra B side with respect to the outer member 22 via the inner rod placement portion 212. Move relative. When the outer peripheral surface of the rod R pressed by the fixing screw 3 comes into contact with the inner surface of the end portion on the vertebra B side of the outer rod placement portion 222, the relative movement of the inner member 21 with respect to the outer member 22 stops.

さらに、内側部材21がZ軸方向椎骨B側に外側部材22に対して相対的に移動することで、ねじ頭配置部211の複数の分離片部211b、…が外側部材22の収納部221における分離片部211bの外径よりも小さい内径を有する部分に押し込まれていく。これにより、内側部材21のねじ頭配置部211の外面部211dは、複数の分離片部211b、…どうしの間隔を狭めるように収納部221の内面部221aにより締め付けられて、ねじ頭配置部211(曲面部211a及び分離片部211b)の内面部で骨ねじ1のねじ頭部12をその中心方向に向けて押圧した状態となる。
具体的には、複数の分離片部211b、…どうしの間隔が狭められることで、当該複数の分離片部211b、…のうち、骨ねじ1のねじ頭部12をその径方向に挟んで対向するものどうしで当該ねじ頭部12を押圧した状態となる。さらに、当該複数の分離片部211b、…によりねじ頭部12が押圧されることで内側部材21の相対的な移動方向と反対方向(図7(b)における上方向)に力が加わりねじ頭部12が曲面部211aに押し付けられる(図7(b)参照)。これにより、ねじ頭部12の外周面の曲面状に形成されている部分は、曲面部211aと接触した状態となるとともに、ねじ頭部12の外周面の凹部14は、複数の分離片部211b、…の椎骨B側の縁部や肉薄部211の分離片部211b側の端部や肉薄部211cの曲面部211a側の端部等に係止された状態となる。
Further, the inner member 21 moves relative to the outer member 22 in the Z-axis direction vertebra B side, so that the plurality of separation piece portions 211b of the screw head arrangement portion 211 are in the storage portion 221 of the outer member 22. The separation piece portion 211b is pushed into a portion having an inner diameter smaller than the outer diameter. Accordingly, the outer surface portion 211d of the screw head arrangement portion 211 of the inner member 21 is tightened by the inner surface portion 221a of the storage portion 221 so as to narrow the interval between the plurality of separation piece portions 211b,. The screw head 12 of the bone screw 1 is pressed toward the center direction on the inner surface of the curved surface portion 211a and the separation piece portion 211b.
Specifically, the intervals between the plurality of separation piece portions 211b,... Are narrowed so that the screw heads 12 of the bone screw 1 are opposed to each other in the radial direction among the plurality of separation piece portions 211b,. It will be in the state which pressed the said screw head 12 with what is to be performed. Further, when the screw head 12 is pressed by the plurality of separation pieces 211b,..., A force is applied in the direction opposite to the relative movement direction of the inner member 21 (upward direction in FIG. 7B). The part 12 is pressed against the curved surface part 211a (see FIG. 7B). Thereby, the part formed in the curved surface shape of the outer peripheral surface of the screw head 12 is in contact with the curved surface portion 211a, and the concave portion 14 on the outer peripheral surface of the screw head 12 includes a plurality of separation piece portions 211b. ,... Are engaged with the edge on the vertebra B side, the end on the separation piece 211b side of the thin portion 211, the end on the curved surface 211a side of the thin portion 211c, and the like.

このように、外側部材22の内面部221aとねじ頭配置部211の外面部211dとを接触させた状態で、ねじ頭配置部211に配置された骨ねじ1のねじ頭部12を当該ねじ頭配置部211の内面部で押圧して、骨ねじ1とホルダー部2との相対的な角度が適正に固定される。この状態では、固定用雌ねじ部223と固定用ねじ3との螺合が解除されても骨ねじ1とホルダー部2との相対的な角度が固定された状態を維持可能となっている(図7(c)参照)。   In this way, the screw head 12 of the bone screw 1 arranged in the screw head arrangement portion 211 in the state where the inner surface portion 221a of the outer member 22 and the outer surface portion 211d of the screw head arrangement portion 211 are brought into contact with each other. The relative angle between the bone screw 1 and the holder portion 2 is appropriately fixed by pressing with the inner surface portion of the arrangement portion 211. In this state, it is possible to maintain a state in which the relative angle between the bone screw 1 and the holder portion 2 is fixed even if the screwing between the fixing female screw portion 223 and the fixing screw 3 is released (see FIG. 7 (c)).

なお、上記脊椎固定装置100を構成する各部、即ち、骨ねじ1、ホルダー部2、固定用ねじ3は、例えば、チタン等を所定の比率で含む合金やステンレス等の医療用材料から構成されている。   In addition, each part which comprises the said spinal fixation apparatus 100, ie, the bone screw 1, the holder part 2, and the fixing screw 3, is comprised from medical materials, such as an alloy and stainless steel etc. which contain titanium etc. in a predetermined ratio, for example. Yes.

<脊椎の固定方法>
次に、脊椎固定装置100を用いた脊椎Vの固定方法について、図7及び図8を参照して詳細に説明する。
図7(a)〜図7(c)は、骨ねじ1とホルダー部2との相対的な角度の固定方法を説明する図である。また、図8は、骨ねじ1とホルダー部2との相対的な角度が固定された状態での当該脊椎固定装置100の使用方法を説明する図である。
<Spine fixation method>
Next, a method for fixing the spine V using the spinal fixation device 100 will be described in detail with reference to FIGS. 7 and 8.
FIG. 7A to FIG. 7C are diagrams illustrating a method for fixing the relative angle between the bone screw 1 and the holder portion 2. FIG. 8 is a diagram illustrating a method of using the spinal fixation device 100 in a state where the relative angle between the bone screw 1 and the holder portion 2 is fixed.

先ず、埋込装置(図示略)を用いて骨ねじ1を脊椎Vの椎骨Bに埋め込む。具体的には、埋込装置を骨ねじ1の取付部13に取り付けて当該骨ねじ1を所定方向に回転させることにより、椎骨Bの所定の螺子込み位置に螺子込んでいく(図8参照)。ここで、骨ねじ1は、Y軸方向に並んだ少なくとも二つの椎骨B、Bの各々にX軸方向に所定間隔を空けて2つずつ埋め込まれる。
なお、図8には、二つの椎骨B、Bの各々に一つずつ脊椎固定装置100の骨ねじ1が埋め込まれた状態を模式的に表している。
First, the bone screw 1 is implanted into the vertebra B of the spine V using an implantation device (not shown). Specifically, the implanting device is attached to the attachment portion 13 of the bone screw 1 and the bone screw 1 is rotated in a predetermined direction, thereby being screwed into a predetermined screwing position of the vertebra B (see FIG. 8). . Here, two bone screws 1 are embedded in each of at least two vertebras B and B arranged in the Y-axis direction at predetermined intervals in the X-axis direction.
FIG. 8 schematically shows a state in which the bone screws 1 of the spinal fixation device 100 are embedded in each of the two vertebrae B and B.

次に、骨ねじ1にホルダー部2を取り付ける。具体的には、内側部材21の複数の分離片部211b、…をZ軸方向に略直交する方向の外側に広げるようにして骨ねじ1のねじ頭部12を押し込むことで、ねじ頭配置部211の内側にねじ頭部12を配置する。これにより、骨ねじ1とホルダー部2とが接続された状態となる。
なお、骨ねじ1とホルダー部2との接続は、骨ねじ1が椎骨Bに埋め込まれる前に行われても良い。即ち、骨ねじ1とホルダー部2とを接続した状態で、骨ねじ1を脊椎Vの椎骨Bに埋め込んでも良い。
Next, the holder part 2 is attached to the bone screw 1. Specifically, the screw head placement portion is formed by pushing the screw head 12 of the bone screw 1 so as to spread the plurality of separation pieces 211b of the inner member 21 outward in a direction substantially orthogonal to the Z-axis direction. The screw head 12 is disposed inside 211. Thereby, the bone screw 1 and the holder part 2 will be in the connected state.
The bone screw 1 and the holder 2 may be connected before the bone screw 1 is embedded in the vertebra B. That is, the bone screw 1 may be embedded in the vertebra B of the spine V while the bone screw 1 and the holder portion 2 are connected.

続けて、内側ロッド配置部212及び外側ロッド配置部222の内側にロッドRを配置する(図7(a)参照)。具体的には、Y軸方向に並んだ少なくとも二つの椎骨Bに対応する各脊椎固定装置100の内側ロッド配置部212及び外側ロッド配置部222の内側にロッドRを配置する。   Subsequently, the rod R is arranged inside the inner rod arrangement portion 212 and the outer rod arrangement portion 222 (see FIG. 7A). Specifically, the rod R is disposed inside the inner rod placement portion 212 and the outer rod placement portion 222 of each spinal fixation device 100 corresponding to at least two vertebrae B arranged in the Y-axis direction.

そして、各脊椎固定装置100の固定用雌ねじ部223に固定用ねじ3を所定のトルクで螺子込んでいくことで、固定用ねじ3の平面部33がロッドRの外周面の皮膚側に臨ませた面と接触して、当該ロッドRを内側ロッド配置部212を介して椎骨B側に押圧していく。
これにより、内側ロッド配置部212を介して内側部材21がZ軸方向椎骨B側に外側部材22に対して相対的に移動する。このとき、ねじ頭配置部211の複数の分離片部211b、…が外側部材22の収納部221における分離片部211bの外径よりも小さい内径を有する部分に押し込まれていく。すると、ねじ頭配置部211の複数の分離片部211b、…の外面部211dは収納部221の内面部221aにより締め付けられて、ねじ頭配置部211の内面部で骨ねじ1のねじ頭部12をその中心方向に向けて押圧した状態となる。
そして、ロッドRの外周面が外側ロッド配置部222の椎骨B側の端部の内面に接触すると、内側部材21の外側部材22に対する相対的な移動が停止する。この状態で、骨ねじ1とホルダー部2との相対的な角度が固定された状態となっている(図7(b)参照)。
Then, the fixing screw 3 is screwed into the fixing female screw portion 223 of each spinal fixation device 100 with a predetermined torque so that the flat portion 33 of the fixing screw 3 faces the skin side of the outer peripheral surface of the rod R. The rod R is pressed to the vertebra B side via the inner rod placement portion 212 in contact with the contact surface.
As a result, the inner member 21 moves relative to the outer member 22 in the Z-axis direction vertebra B side via the inner rod placement portion 212. At this time, the plurality of separation piece portions 211b of the screw head arrangement portion 211 are pushed into a portion having an inner diameter smaller than the outer diameter of the separation piece portion 211b in the storage portion 221 of the outer member 22. Then, the outer surface portions 211d of the plurality of separation piece portions 211b,... Of the screw head arrangement portion 211 are fastened by the inner surface portion 221a of the storage portion 221, and the screw head 12 of the bone screw 1 on the inner surface portion of the screw head arrangement portion 211 Is pressed toward the center direction.
When the outer peripheral surface of the rod R comes into contact with the inner surface of the end portion on the vertebra B side of the outer rod arrangement portion 222, the relative movement of the inner member 21 with respect to the outer member 22 stops. In this state, the relative angle between the bone screw 1 and the holder portion 2 is fixed (see FIG. 7B).

上記のようにしてねじ頭配置部211の内面部で骨ねじ1のねじ頭部12をその中心方向に向けて押圧した状態では、固定用雌ねじ部223と固定用ねじ3との螺合が解除されても骨ねじ1とホルダー部2との相対的な角度が固定された状態を維持可能となっている(図7(c)参照)。
これにより、何れか一の脊椎固定装置100を他の脊椎固定装置100に対してY軸方向に移動させるようにして椎骨B間の距離を調整する際に、骨ねじ1やホルダー部2に対して大きな負荷がかかっても、骨ねじ1とホルダー部2との相対的な角度が変化してしまうことがなくなる(図8参照)。
In the state where the screw head 12 of the bone screw 1 is pressed toward the center direction on the inner surface of the screw head arrangement portion 211 as described above, the screw engagement between the fixing female screw portion 223 and the fixing screw 3 is released. Even if this is done, it is possible to maintain a state in which the relative angle between the bone screw 1 and the holder portion 2 is fixed (see FIG. 7C).
Thereby, when adjusting the distance between the vertebra B so that any one spinal fixation device 100 is moved in the Y-axis direction with respect to the other spinal fixation devices 100, the bone screw 1 and the holder portion 2 can be adjusted. Even when a large load is applied, the relative angle between the bone screw 1 and the holder portion 2 does not change (see FIG. 8).

なお、椎骨B間の距離の調整後に、固定用ねじ3が固定用雌ねじ部223に再度螺子込まれることで、ロッドRに対して脊椎固定装置100が所望の位置に取付け固定された状態となる。   After the distance between the vertebra B is adjusted, the fixing screw 3 is screwed into the fixing female screw portion 223 again, so that the spinal fixation device 100 is attached and fixed to the rod R at a desired position. .

次に、骨ねじ1とホルダー部2との相対的な角度の固定の解除方法について、図9及び図10を参照して説明する。
図9は、固定解除装置200の分解斜視図である。また、図10(a)及び図10(b)は、固定解除装置200を用いた骨ねじ1とホルダー部2との相対的な角度の固定解除を説明する片側断面図である。
Next, a method of releasing the relative angle between the bone screw 1 and the holder portion 2 will be described with reference to FIGS. 9 and 10.
FIG. 9 is an exploded perspective view of the fixing release device 200. 10 (a) and 10 (b) are one-side cross-sectional views for explaining the unlocking of the relative angle between the bone screw 1 and the holder part 2 using the fixing / unlocking device 200. FIG.

先ず、固定解除装置200について、図9を参照して説明する。
図9に示すように、固定解除装置200は、解除用雌ねじ部213に螺子込まれる螺合部材201と、この螺合部材201を内包する筒状の位置決め部材202とを備えている。
First, the fixing release device 200 will be described with reference to FIG.
As shown in FIG. 9, the fixation releasing device 200 includes a screwing member 201 screwed into the releasing female screw part 213, and a cylindrical positioning member 202 containing the screwing member 201.

螺合部材201は、所定方向に長尺な略円柱状に形成され、一端部に雄ねじ部201aが形成され、他端部に把持部201bが設けられている。
雄ねじ部201aは、所定ピッチのねじ山を有し、解除用雌ねじ部213のねじ山と螺合可能となっている。
把持部201bは、当該固定解除装置200を使用するユーザにより把持されるものである。
The screwing member 201 is formed in a substantially cylindrical shape that is long in a predetermined direction, a male screw portion 201a is formed at one end portion, and a gripping portion 201b is provided at the other end portion.
The male screw portion 201a has a screw thread with a predetermined pitch and can be screwed with the screw thread of the release female screw portion 213.
The gripper 201b is gripped by a user who uses the fixation release device 200.

位置決め部材202は、外側部材22の皮膚側の端部に接触して位置決めするものである。具体的には、位置決め部材202は、螺合部材201の略円柱状に形成された部分と略等しい長さの略円筒状に形成され、一端部に内側ロッド配置部212及び外側ロッド配置部222と係合する係合部202a及び外側部材22の皮膚側の端部と当接する当接部202bが形成されている。   The positioning member 202 is positioned in contact with the skin side end of the outer member 22. Specifically, the positioning member 202 is formed in a substantially cylindrical shape having a length substantially equal to the portion of the screwing member 201 formed in a substantially cylindrical shape, and has an inner rod placement portion 212 and an outer rod placement portion 222 at one end. And an abutting portion 202b that abuts against the skin-side end portion of the outer member 22 are formed.

係合部202aは、内側ロッド配置部212の内形に対応させて、断面視略「U」字状に形成されている。具体的には、筒状をなす位置決め部材202の側壁部が切り欠かれることで、断面視略「U」字状の係合部202aがZ軸方向に略直交する方向に二つ形成され、これら二つの係合部202a、202aどうしの間により当接部202bが構成されている。   The engaging portion 202a is formed in a substantially “U” shape in sectional view, corresponding to the inner shape of the inner rod placement portion 212. Specifically, by cutting out the side wall portion of the cylindrical positioning member 202, two engagement portions 202a having a substantially “U” shape in cross section are formed in a direction substantially orthogonal to the Z-axis direction. A contact portion 202b is formed between the two engagement portions 202a and 202a.

係合部202aの当該位置決め部材202の軸方向の長さ、即ち、当接部202bから係合部202aの脊椎固定装置100側の先端までの長さは、外側ロッド配置部222の深さよりも短くなっている。従って、当該位置決め部材202が当接部202bを外側部材22の皮膚側の端部に当接させるように取り付けられた状態で、係合部202aの先端部が外側ロッド配置部222の椎骨B側の端部の内面と接触しないようになっている(図10(a)及び図10(b)参照)。
また、係合部202aの脊椎固定装置100側の端部は、内側ロッド配置部212の椎骨B側の端部の内面と接触可能となるように、当該内面と略等しい曲率で略円弧状に湾曲して形成されている。
また、係合部202aの軸方向に略直交する方向の厚さは、外側ロッド配置部222の同方向の厚さよりも厚く、具体的には、外側ロッド配置部222の同方向の厚さと内側ロッド配置部212の同方向の厚さとを加算した値と略等しいか、或いは、この値よりもわずかに薄くなっている。
The length of the engaging portion 202a in the axial direction of the positioning member 202, that is, the length from the contact portion 202b to the distal end of the engaging portion 202a on the spinal fixation device 100 side is larger than the depth of the outer rod placement portion 222. It is getting shorter. Therefore, in a state where the positioning member 202 is attached so that the contact portion 202b is in contact with the skin-side end portion of the outer member 22, the distal end portion of the engagement portion 202a is on the vertebra B side of the outer rod placement portion 222. It is made not to contact the inner surface of the edge part (refer FIG. 10 (a) and FIG.10 (b)).
In addition, the end of the engagement portion 202a on the spinal fixation device 100 side has a substantially arc shape with a curvature substantially equal to the inner surface so as to be in contact with the inner surface of the end of the inner rod placement portion 212 on the vertebra B side. It is curved.
In addition, the thickness of the engaging portion 202a in the direction substantially orthogonal to the axial direction is thicker than the thickness of the outer rod placement portion 222 in the same direction. It is substantially equal to a value obtained by adding the thicknesses in the same direction of the rod arrangement portion 212 or slightly smaller than this value.

上記した構成の固定解除装置200は、脊椎固定装置100とともに本発明を適用した脊椎固定システムを構成している。   The fixation release device 200 configured as described above constitutes a spinal fixation system to which the present invention is applied together with the spinal fixation device 100.

<固定解除方法>
以下に説明する固定解除方法にあっては、予め脊椎固定装置100のホルダー部2から固定用ねじ3とロッドRが取り外されているものとする。また、位置決め部材202の内側に螺合部材201が配置されているものとする。
<Unlocking method>
In the fixation releasing method described below, it is assumed that the fixing screw 3 and the rod R are removed from the holder portion 2 of the spinal fixation device 100 in advance. Further, it is assumed that the screwing member 201 is disposed inside the positioning member 202.

先ず、位置決め部材202を係合部202aが内側ロッド配置部212及び外側ロッド配置部222の内側に配置されるとともに当接部202bが外側部材22の皮膚側の端部に当接するように脊椎固定装置100に取り付ける。これにより、当該固定解除装置200が外側部材22に対して位置決めされた状態となる(図10(a)参照)。   First, the positioning member 202 is fixed to the spine so that the engagement portion 202a is disposed inside the inner rod placement portion 212 and the outer rod placement portion 222, and the abutment portion 202b is in contact with the skin side end of the outer member 22. Attach to device 100. Thereby, the said fixing release apparatus 200 will be in the state positioned with respect to the outer side member 22 (refer Fig.10 (a)).

そして、ユーザにより把持部201bが把持された螺合部材201を位置決め部材202に対して所定方向に回転させることで、螺合部材201の雄ねじ部201aを解除用雌ねじ部213に螺入していく。これにより、内側部材21が固定解除装置200側に引きつけられるように、即ち、内側部材21が外側部材22に対してZ軸方向皮膚側に移動し、収納部221の内面部221aによるねじ頭配置部211の複数の分離片部211b、…の外面部211dの締め付けが解除されていく(図10(b)参照)。
結果として、外側部材22の内面部221aとねじ頭配置部211の外面部211dとの接触が解除されて、ねじ頭配置部211の内面部による骨ねじ1のねじ頭部12の押圧が解除された状態となることで、骨ねじ1とホルダー部2との相対的な角度の固定が解除される。
Then, by rotating the screwing member 201 on which the gripping part 201b is gripped by the user in a predetermined direction with respect to the positioning member 202, the male screw part 201a of the screwing member 201 is screwed into the female screw part 213 for release. . Thereby, the inner member 21 is attracted to the fixing release device 200 side, that is, the inner member 21 moves to the skin side in the Z-axis direction with respect to the outer member 22, and the screw head is arranged by the inner surface portion 221 a of the storage portion 221. The tightening of the outer surface portion 211d of the plurality of separation piece portions 211b of the portion 211 is released (see FIG. 10B).
As a result, the contact between the inner surface portion 221a of the outer member 22 and the outer surface portion 211d of the screw head arrangement portion 211 is released, and the pressing of the screw head 12 of the bone screw 1 by the inner surface portion of the screw head arrangement portion 211 is released. In this state, the fixing of the relative angle between the bone screw 1 and the holder portion 2 is released.

以上のように、本実施形態の脊椎固定装置100によれば、ホルダー部2は、骨ねじ1のねじ頭部12が配置されるねじ頭配置部211を具備する内側部材21と、ねじ頭配置部211の外面部211dと接触可能な内面部221aを具備する外側部材22と、を有し、外側部材22の内面部221aとねじ頭配置部211の外面部211dとを接触させた状態で、骨ねじ1のねじ頭部12を当該ねじ頭配置部211の内面部221aで押圧して、骨ねじ1とホルダー部2との相対的な角度を固定するように構成されているので、従来の技術における骨ねじ1とホルダー部2との角度を固定するための部材(リング等)が不要となり、より単純な構成で骨ねじ1とホルダー部2との相対的な角度の固定を適正に行うことができる。特に、ねじ頭配置部211の内面部で骨ねじ1のねじ頭部12をその中心方向に向けて押圧することで、骨ねじ1とホルダー部2との相対的な角度をより強固に固定することができる。
結果として、当該脊椎固定装置100の部品点数の増加及び装置構成の複雑化を抑制することができるだけでなく、当該脊椎固定装置100の取扱性の悪化やコストアップを抑制することができる。
As described above, according to the spinal fixation device 100 of the present embodiment, the holder portion 2 includes the inner member 21 including the screw head placement portion 211 on which the screw head 12 of the bone screw 1 is placed, and the screw head placement. An outer member 22 having an inner surface portion 221a that can come into contact with the outer surface portion 211d of the portion 211, and the inner surface portion 221a of the outer member 22 and the outer surface portion 211d of the screw head arrangement portion 211 are in contact with each other. Since the screw head 12 of the bone screw 1 is pressed by the inner surface portion 221a of the screw head arrangement portion 211, the relative angle between the bone screw 1 and the holder portion 2 is fixed. A member (ring or the like) for fixing the angle between the bone screw 1 and the holder portion 2 in the technology is not required, and the relative angle between the bone screw 1 and the holder portion 2 is appropriately fixed with a simpler configuration. be able to. In particular, the relative angle between the bone screw 1 and the holder portion 2 is more firmly fixed by pressing the screw head 12 of the bone screw 1 toward the center direction on the inner surface of the screw head arrangement portion 211. be able to.
As a result, it is possible not only to suppress the increase in the number of parts and the complexity of the device configuration of the spinal fixation device 100, but also to suppress the deterioration in handling property and cost increase of the spinal fixation device 100.

また、内側部材21の内側ロッド配置部212に配置されたロッドRが所定の一方向(Z軸方向椎骨B側)に押圧されることで、内側部材21が当該所定の一方向に外側部材22に対して相対的に移動し、所定の一方向に沿って漸次縮径されてなる外側部材22の内面部221aとねじ頭配置部211の外面部211dとが接触するので、ロッドRを所定の一方向に押圧するだけで外側部材22の内面部221aとねじ頭配置部211の外面部211dとを接触させて、骨ねじ1のねじ頭部12をねじ頭配置部211の内面部で押圧した状態とすることができる。具体的には、内側部材21が所定の一方向に外側部材22に対して移動することで、複数の分離片部211b、…どうしの間隔を狭めるようにねじ頭配置部211が外側部材22の内面部221aにより締め付けられて当該ねじ頭配置部211の内面部で骨ねじ1のねじ頭部12を押圧することができる。
このとき、外側部材22の固定用雌ねじ部223に固定用ねじ3が螺子込まれることで、当該固定用ねじ3の先端部でロッドRを所定の一方向に押圧して固定するように構成されているので、固定用雌ねじ部223に固定用ねじ3を螺子込むだけでロッドRを所定の一方向に押圧していくことができ、より単純な構成で骨ねじ1のねじ頭部12をねじ頭配置部211の内面部で押圧した状態とすることができる。さらに、かかる状態では、固定用雌ねじ部223から固定用ねじ3が取り外されることで当該固定用雌ねじ部223と固定用ねじ3との螺合が解除されても、骨ねじ1とホルダー部2との相対的な角度が固定された状態を維持することができる。
Further, the rod R arranged in the inner rod placement portion 212 of the inner member 21 is pressed in a predetermined direction (Z-axis direction vertebra B side), whereby the inner member 21 is moved in the predetermined direction to the outer member 22. Since the inner surface portion 221a of the outer member 22 and the outer surface portion 211d of the screw head arrangement portion 211 are in contact with each other, the rod R is fixed to a predetermined amount. The inner surface portion 221a of the outer member 22 and the outer surface portion 211d of the screw head arrangement portion 211 are brought into contact with each other only by pressing in one direction, and the screw head 12 of the bone screw 1 is pressed by the inner surface portion of the screw head arrangement portion 211. State. Specifically, when the inner member 21 moves with respect to the outer member 22 in a predetermined direction, the screw head arrangement portion 211 of the outer member 22 reduces the interval between the plurality of separation piece portions 211b,. The screw head 12 of the bone screw 1 can be pressed by the inner surface portion of the screw head arrangement portion 211 by being tightened by the inner surface portion 221a.
At this time, the fixing screw 3 is screwed into the fixing female screw portion 223 of the outer member 22 so that the rod R is pressed and fixed in a predetermined direction at the tip end portion of the fixing screw 3. Therefore, the rod R can be pressed in a predetermined direction only by screwing the fixing screw 3 into the fixing female screw portion 223, and the screw head 12 of the bone screw 1 can be screwed with a simpler configuration. It can be set as the state pressed by the inner surface part of the head arrangement | positioning part 211. FIG. Furthermore, in this state, even if the fixing screw 3 is removed from the fixing female screw part 223 and the screwing between the fixing female screw part 223 and the fixing screw 3 is released, the bone screw 1 and the holder part 2 It is possible to maintain a state in which the relative angle of each is fixed.

また、骨ねじ1は、ホルダー部2に対する相対的な角度が固定されていない状態では、ねじ頭部12がねじ頭配置部211に着脱可能に構成されているので、骨ねじ1を椎骨Bに埋め込む施術をより柔軟に行うことができる。即ち、ホルダー部2に保持されていない骨ねじ1を椎骨Bに埋め込んだ後、そのねじ頭部12をねじ頭配置部211に取り付けるようにしても良いし、或いは、ねじ頭部12がねじ頭配置部211に取り付けられた状態の骨ねじ1を椎骨Bに埋め込むようにしても良い。   In addition, the bone screw 1 is configured so that the screw head 12 can be attached to and detached from the screw head placement portion 211 in a state where the relative angle with respect to the holder portion 2 is not fixed. Embedding can be performed more flexibly. That is, after the bone screw 1 not held by the holder portion 2 is embedded in the vertebra B, the screw head 12 may be attached to the screw head arrangement portion 211, or the screw head 12 may be attached to the screw head. The bone screw 1 attached to the placement unit 211 may be embedded in the vertebra B.

また、位置決め部材202及び螺合部材201を有する固定解除装置200を用いることで、骨ねじ1とホルダー部2との相対的な角度の固定をより容易に解除することができる。即ち、骨ねじ1とホルダー部2との相対的な角度が固定された状態で、位置決め部材202により固定解除装置200を外側部材22に対して位置決めして、螺合部材201を内側部材21の解除用雌ねじ部213に螺子込むことで、内側部材21を外側部材22に対して所定の一方向と反対方向(Z軸方向皮膚側)に移動させ、外側部材22の内面部221aとねじ頭配置部211の外面部211dとの接触を解除することができる。これにより、ねじ頭配置部211の内面部による骨ねじ1のねじ頭部12の押圧を解除して、骨ねじ1とホルダー部2との相対的な角度の固定を解除することができる。
従って、例えば、骨ねじ1とホルダー部2との相対的な角度が固定された後、当該角度を再度調整したい場合等に、固定解除装置200を用いることで、骨ねじ1とホルダー部2との相対的な角度の固定をより容易に解除して、当該角度の再調整をより容易に行うことができる。
Further, by using the fixing release device 200 having the positioning member 202 and the screwing member 201, the relative angle fixing between the bone screw 1 and the holder portion 2 can be released more easily. That is, in a state where the relative angle between the bone screw 1 and the holder portion 2 is fixed, the fixing release device 200 is positioned with respect to the outer member 22 by the positioning member 202, and the screwing member 201 is moved to the inner member 21. By screwing into the release female screw portion 213, the inner member 21 is moved in a direction opposite to the predetermined one direction (Z-axis direction skin side) with respect to the outer member 22, and the inner surface portion 221a of the outer member 22 and the screw head arrangement are arranged. Contact with the outer surface portion 211d of the portion 211 can be released. Thereby, the pressing of the screw head 12 of the bone screw 1 by the inner surface portion of the screw head arrangement portion 211 can be released, and the fixation of the relative angle between the bone screw 1 and the holder portion 2 can be released.
Therefore, for example, when the relative angle between the bone screw 1 and the holder portion 2 is fixed, and then it is desired to adjust the angle again, by using the fixing release device 200, the bone screw 1 and the holder portion 2 The relative angle can be fixed more easily, and the angle can be readjusted more easily.

なお、本発明は、上記実施形態に限定されることなく、本発明の趣旨を逸脱しない範囲において、種々の改良並びに設計の変更を行っても良い。
例えば、上記実施形態にあっては、固定用ねじ3の先端部でロッドRを所定の一方向に押圧して、外側部材22の内面部221aとねじ頭配置部211の外面部211dとを接触させるような構成を例示したが、一例であってこれに限られるものではなく、外側部材22の内面部221aとねじ頭配置部211の外面部211dとを接触させた状態で、骨ねじ1のねじ頭部12を当該ねじ頭配置部211の内面部221aで押圧するような構成であれば適宜任意に変更可能である。
The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, in the above embodiment, the rod R is pressed in a predetermined direction with the tip of the fixing screw 3 to contact the inner surface 221a of the outer member 22 and the outer surface 211d of the screw head arrangement portion 211. However, the present invention is not limited to this example, and the bone screw 1 is in contact with the inner surface 221a of the outer member 22 and the outer surface 211d of the screw head arrangement portion 211. Any configuration can be used as appropriate as long as the screw head 12 is pressed by the inner surface portion 221a of the screw head arrangement portion 211.

また、上記実施形態にあっては、位置決め部材202が螺合部材201を内包する構成の固定解除装置200を例示したが、固定解除装置200の構成は一例であってこれに限られるものではなく、適宜任意に変更可能である。さらに、固定解除装置200は、位置決め部材202に対して螺合部材201が抜けるのを防止する機構を具備していても良い。   Moreover, in the said embodiment, although the fixing release apparatus 200 of the structure in which the positioning member 202 includes the screwing member 201 was illustrated, the structure of the fixing release apparatus 200 is an example, and is not restricted to this. These can be arbitrarily changed as appropriate. Further, the fixing release device 200 may include a mechanism that prevents the screwing member 201 from coming off from the positioning member 202.

また、上記実施形態にあっては、ロッドRとして、断面形状が略等しい略円柱状とされたものを例示したが、ロッドRの外形はこれに限られるものではない。
ここで、ロッドRの外形を円柱状以外とした場合には、内側ロッド配置部212や外側ロッド配置部222の椎骨側の面を、ロッドRの外周面の形状に合わせて当該外周面の少なくとも一部に沿う形状に形成すれば良い。
Moreover, in the said embodiment, although what was made into the substantially cylindrical shape with a substantially equal cross-sectional shape was illustrated as the rod R, the external shape of the rod R is not restricted to this.
Here, when the outer shape of the rod R is other than a columnar shape, the vertebra side surfaces of the inner rod arrangement portion 212 and the outer rod arrangement portion 222 are matched with the shape of the outer circumference surface of the rod R to at least the outer circumference surface. What is necessary is just to form in the shape along a part.

加えて、今回開示された実施形態は、全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。   In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

100 脊椎固定装置
1 骨ねじ(埋込部材)
12 ねじ頭部(非埋込部)
2 ホルダー部(保持部)
21 内側部材
211 ねじ頭配置部(非埋込部配置部)
211b 分離片部
211d 外面部
212 内側ロッド配置部
213 解除用雌ねじ部(解除用被螺合部)
22 外側部材
221 収納部
221a 内面部
223 固定用雌ねじ部(固定用被螺合部)
3 固定用ねじ
200 固定解除装置
201 螺合部材
201a 雄ねじ部
202 位置決め部材
R ロッド
100 Spinal Fixation Device 1 Bone Screw (Implanted Member)
12 Screw head (non-embedded part)
2 Holder part (holding part)
21 Inner member 211 Screw head arrangement part (non-embedding part arrangement part)
211b Separating piece portion 211d Outer surface portion 212 Inner rod placement portion 213 Release female screw portion (release screwed portion)
22 Outer member 221 Storage portion 221a Inner surface portion 223 Fixing female screw portion (fixing screwed portion)
3 Fixing screw 200 Unlocking device 201 Screwing member 201a Male thread portion 202 Positioning member R Rod

Claims (7)

ロッドと接続されて脊椎を固定する脊椎固定装置であって、
前記脊椎を構成する椎骨に一部分が埋め込まれる長尺な埋込部材と、
前記埋込部材及び前記ロッドを保持可能な保持部と、を備え、
前記保持部は、
前記埋込部材の椎骨に埋め込まれない非埋込部が配置される非埋込部配置部を具備する内側部材と、
前記内側部材の外側に設けられ、前記非埋込部配置部の外面部の略全域と接触可能な内面部を具備する外側部材と、を有し、
前記非埋込部配置部は、その外面部に所定の一方向に沿って漸次縮径された第1のテーパー状の部分を具備するとともに、当該非埋込部配置部の内面部から外側に所定の深さ座刳られるように形成された肉薄部を具備してなり、
前記外側部材は、その内面部に前記所定の一方向に沿って漸次縮径された第2のテーパー状の部分を具備してなり、
前記内側部材が前記所定の一方向に前記外側部材に対して移動することで、前記外側部材の内面部の前記第2のテーパー状の部分と前記非埋込部配置部の外面部の前記第1のテーパー状の部分とを接触させ、この状態で、前記非埋込部配置部に配置された前記非埋込部を当該非埋込部配置部の内面部で押圧して、前記埋込部材と前記保持部との相対的な角度を固定するとともに、前記非埋込部の外面に形成されている凹部が前記非埋込部配置部の前記肉薄部の端部に係止可能となるように構成されていることを特徴とする脊椎固定装置。
A spinal fixation device connected to a rod to fix the spine,
A long implant member partially embedded in the vertebrae constituting the spine;
A holding portion capable of holding the embedded member and the rod,
The holding part is
An inner member comprising a non-implanted portion placement portion in which a non-implant portion that is not embedded in the vertebra of the implant member is disposed;
An outer member provided on the outer side of the inner member, and having an inner surface portion that can come into contact with substantially the entire outer surface portion of the non-embedded portion arrangement portion,
The non-embedded portion arrangement portion includes a first tapered portion that is gradually reduced in diameter along a predetermined direction on an outer surface portion thereof, and is formed outward from the inner surface portion of the non-embedded portion arrangement portion. It has a thin part formed so that it can be squeezed at a predetermined depth,
The outer member includes a second tapered portion that is gradually reduced in diameter along the predetermined direction on the inner surface thereof.
When the inner member moves in the predetermined direction with respect to the outer member, the second tapered portion of the inner surface portion of the outer member and the first surface of the outer surface portion of the non-embedded portion disposition portion . 1 in contact with the tapered portion, and in this state, the non-embedded portion arranged in the non-embedded portion arranging portion is pressed by the inner surface portion of the non-embedded portion arranged portion, thereby The relative angle between the member and the holding portion is fixed, and the concave portion formed on the outer surface of the non-embedded portion can be locked to the end portion of the thin portion of the non-embedded portion arrangement portion. It is comprised so that the spine fixation apparatus characterized by the above-mentioned.
前記非埋込部配置部は、前記所定の一方向に沿った軸を中心とする周方向に複数分離されてなり、
前記内側部材が前記所定の一方向に前記外側部材に対して移動することで、前記非埋込部配置部の分離された部分どうしの間隔を狭めるように当該非埋込部配置部が前記外側部材の内面部により締め付けられて前記非埋込部配置部の内面部で前記非埋込部を押圧することを特徴とする請求項1に記載の脊椎固定装置。
The non-embedded portion arrangement portion is divided into a plurality of circumferential directions around an axis along the predetermined one direction,
When the inner member moves in the predetermined direction with respect to the outer member, the non-embedded portion arrangement portion is arranged on the outer side so as to reduce the interval between the separated portions of the non-embedded portion arrangement portion. The spinal fixation device according to claim 1, wherein the spinal fixation device is pressed by the inner surface portion of the member and pressed by the inner surface portion of the non-implanted portion arrangement portion.
前記内側部材は、
前記非埋込部配置部が設けられた側と反対側に設けられ、前記ロッドが配置されるロッド配置部を更に具備し、
前記ロッド配置部に配置された前記ロッドが前記所定の一方向に押圧されることで、前記内側部材が当該所定の一方向に前記外側部材に対して移動し、前記外側部材の内面部の前記第2のテーパー状の部分と前記非埋込部配置部の外面部の前記第1のテーパー状の部分とが接触することを特徴とする請求項1又は2に記載の脊椎固定装置。
The inner member is
A rod arrangement part provided on the opposite side to the side where the non-embedding part arrangement part is provided, and further comprising a rod arrangement part on which the rod is arranged;
When the rod disposed in the rod placement portion is pressed in the predetermined direction, the inner member moves relative to the outer member in the predetermined direction, and the inner surface portion of the outer member moves. 3. The spinal fixation device according to claim 1, wherein the second tapered portion is in contact with the first tapered portion of the outer surface portion of the non-embedded portion arrangement portion.
前記外側部材は、
前記ロッド配置部に配置された前記ロッドを固定するための固定用ねじが螺子込まれる固定用被螺合部を更に具備し、
前記固定用被螺合部に前記固定用ねじが螺子込まれることで、当該固定用ねじの先端部で前記ロッドを前記所定の一方向に押圧して固定するように構成されていることを特徴とする請求項3に記載の脊椎固定装置。
The outer member is
A fixing screwed portion into which a fixing screw for fixing the rod arranged in the rod arrangement portion is screwed;
The fixing screw is screwed into the fixing threaded portion so that the rod is pressed and fixed in the predetermined direction at the tip of the fixing screw. The spinal fixation device according to claim 3.
前記埋込部材と前記保持部との相対的な角度を固定したまま、前記固定用被螺合部と前記固定用ねじとの螺合を解除可能に構成されていることを特徴とする請求項4に記載の脊椎固定装置。   The screwing between the fixing screwed portion and the fixing screw can be released while the relative angle between the embedded member and the holding portion is fixed. 4. The spinal fixation device according to 4. 前記埋込部材は、前記非埋込部が前記非埋込部配置部に着脱可能に構成されていることを特徴とする請求項1〜5の何れか一項に記載の脊椎固定装置。   The spinal fixation device according to any one of claims 1 to 5, wherein the embedded member is configured such that the non-implanted part can be attached to and detached from the non-implanted part disposition part. 脊椎固定装置と、固定解除装置と、を備える脊椎固定システムであって、
前記脊椎固定装置は、
ロッドと接続されて脊椎を固定するものであり、
前記脊椎を構成する椎骨に一部分が埋め込まれる長尺な埋込部材と、
前記埋込部材及び前記ロッドを保持可能な保持部と、を備え、
前記保持部は、
前記埋込部材の椎骨に埋め込まれない非埋込部が配置される非埋込部配置部を具備する内側部材と、
前記内側部材の外側に設けられ、前記非埋込部配置部の外面部と接触可能な内面部を具備する外側部材と、を有し、
前記外側部材の内面部と前記非埋込部配置部の外面部とを接触させた状態で、前記非埋込部配置部に配置された前記非埋込部を当該非埋込部配置部の内面部で押圧して、前記埋込部材と前記保持部との相対的な角度を固定するように構成され、
前記固定解除装置は、
前記埋込部材と前記保持部との相対的な角度の固定を解除するものであり、
前記外側部材の前記埋込部材と反対側の端部に接触して位置決めする位置決め部材と、
前記内側部材の前記非埋込部配置部が設けられた側と反対側に設けられた解除用被螺合部に螺子込まれる螺合部材と、を有し、
前記位置決め部材により当該固定解除装置が前記外側部材に対して位置決めされた状態で、前記螺合部材が前記内側部材の前記解除用被螺合部に螺子込まれることで、前記内側部材が前記外側部材に対して前記所定の一方向と反対方向に移動し、前記外側部材の内面部と前記非埋込部配置部の外面部との接触を解除するように構成されていることを特徴とする脊椎固定システム。
A spinal fixation system comprising a spinal fixation device and a fixation release device,
The spinal fixation device comprises:
It is connected to the rod to fix the spine,
A long implant member partially embedded in the vertebrae constituting the spine;
A holding portion capable of holding the embedded member and the rod,
The holding part is
An inner member comprising a non-implanted portion placement portion in which a non-implant portion that is not embedded in the vertebra of the implant member is disposed;
An outer member provided on the outer side of the inner member, and having an inner surface portion that can come into contact with an outer surface portion of the non-embedded portion arrangement portion,
In a state where the inner surface portion of the outer member and the outer surface portion of the non-embedded portion arrangement portion are in contact with each other, the non-embedded portion arranged in the non-embedded portion arrangement portion is changed to the non-embedded portion arrangement portion. It is configured to press the inner surface portion to fix the relative angle between the embedded member and the holding portion,
The fixing release device is
The fixing of the relative angle between the embedded member and the holding part is released,
A positioning member that contacts and positions an end of the outer member opposite to the embedded member;
A screwing member to be screwed into a release screwed part provided on the side opposite to the side on which the non-embedded part arrangement part of the inner member is provided,
When the fixing member is positioned with respect to the outer member by the positioning member, the screw member is screwed into the release screwed portion of the inner member, so that the inner member is moved to the outer member. It is configured to move in a direction opposite to the predetermined one direction with respect to the member, and to release the contact between the inner surface portion of the outer member and the outer surface portion of the non-embedding portion arrangement portion. Spinal fixation system.
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