阅读说明：本技术 偏头螺钉、脊柱矫正固定系统以及螺钉安装工具 (Eccentric screw, spinal column correction fixing system and screw mounting tool ) 是由 朱如森 刘明岩 刘幸 于 2021-09-30 设计创作，主要内容包括：本发明提供一种偏头螺钉、脊柱矫正固定系统以及螺钉安装工具,包括：主钉杆、连接头和偏头柱；主钉杆与连接头的连接面连接,偏头柱与连接头的半球形面连接,主钉杆的中轴线相对于偏头柱的中轴线为倾斜设置；偏头柱的外侧面上设有偏头部外螺纹；偏头柱的远离所述连接头的一端上设有定位孔；偏头柱上设有定位安装槽,定位安装槽沿着所述偏头柱的轴向延伸,定位安装槽延伸方向为定位安装槽的长度方向,定位安装槽延伸至所述连接头,定位安装槽与定位孔连通。本发明的偏头螺钉以及脊柱矫正固定系统,手术切口较小,且主钉杆植入过程中,主钉杆不容易打穿椎体,定位安装槽便于偏头螺钉与螺钉安装工具进行装配,有利于偏头螺钉快速安装。(The invention provides an offset head screw, a spine correction fixing system and a screw mounting tool, comprising: the main nail rod, the connector and the offset column; the main nail rod is connected with the connecting surface of the connector, the eccentric column is connected with the hemispherical surface of the connector, and the central axis of the main nail rod is obliquely arranged relative to the central axis of the eccentric column; the outer side surface of the eccentric head column is provided with an eccentric head external thread; one end of the head-biased column, which is far away from the connector, is provided with a positioning hole; be equipped with the location mounting groove on the head post partially, the location mounting groove along the axial extension of head post partially, location mounting groove extending direction is the length direction of location mounting groove, and the location mounting groove extends to connector, location mounting groove and locating hole intercommunication. The eccentric screw and the spine correction fixing system have small surgical incision, and the main screw rod is not easy to penetrate through a vertebral body in the implantation process of the main screw rod, so that the positioning installation groove is convenient for the assembly of the eccentric screw and a screw installation tool, and the rapid installation of the eccentric screw is facilitated.)

1. An offset head screw, comprising: the main nail rod (110), the connector (120) and the offset column (130); the connector (120) is of a hemispherical structure, and two opposite side surfaces of the connector (120) are a hemispherical surface (121) and a connecting surface (122) respectively; the main nail rod (110) is connected with the connecting surface (122) of the connector (120), the head-biased column (130) is connected with the hemispherical surface (121) of the connector (120), the central axis of the main nail rod (110), the central axis of the connector (120) and the central axis of the head-biased column (130) are all located on the same plane, the central axis of the head-biased column (130) is collinear with the central axis of the connector (120), and the central axis of the main nail rod (110) is obliquely arranged relative to the central axis of the head-biased column (130); the outer side surface of the head-biased column (130) is provided with head-biased external threads (131); one end of the head-biased column (130) far away from the connector (120) is provided with a positioning hole (132), and head-biased internal threads are arranged on the positioning hole (132); a central axis of the positioning hole (132) is collinear with a central axis of the offset head post (130);

be equipped with location mounting groove (133) on head post (130) partially, location mounting groove (133) extending direction does the length direction of location mounting groove (133), location mounting groove (133) extend to connector (120), location mounting groove (133) with locating hole (132) intercommunication.

2. The offset head screw of claim 1 wherein: the first positioning groove wall (1331) in the length direction of the positioning installation groove (133) is located on the connector (120), the first positioning groove wall (1331) is a plane, and the positioning groove wall is perpendicular to the central axis of the connector (120).

3. The offset head screw of claim 2, wherein: the plane passing through the central axis of the eccentric head column (130) and the positioning installation groove (133) is a first middle plane, and the eccentric head screw has a symmetrical structure taking the first middle plane as a middle axis plane.

4. The offset head screw of claim 3 wherein: the outer peripheral face of the connector (120) is provided with two parallel notch planes (123), and the positioning installation grooves (133) are located between the notch planes (123).

5. The offset head screw of claim 1 wherein: and a screw truncation groove (134) is formed in the peripheral surface of the head-biased column (130).

6. A spinal correction fixation system, comprising: the orthopedic plate (200), two locking members (300) and two of the offset head screws of claim 4;

the correcting bone plate (200) is in a long strip-shaped structure, and a first plate bearing surface (210) and a second plate bearing surface (220) which are oppositely and parallelly arranged are arranged on the correcting bone plate (200);

the first plate receiving surface (210) is provided with a first receiving groove part (230), two ends of the first receiving groove part (230) along the length direction of the correcting bone plate (200) penetrate through, and two first receiving groove walls (231) in the width direction of the first receiving groove part (230) are parallel;

the second plate receiving surface (220) is provided with a second receiving groove part (240), the two ends of the second receiving groove part (240) along the length direction of the correcting bone plate (200) are penetrated, and two second receiving groove walls (241) in the width direction of the second receiving groove part (240) are parallel; the distance between the two second adapting groove walls (241) is equal to the distance between the two notch planes (123) of the eccentric head screw;

at least one first receiving through hole (251) is formed in the bottom surface of the first groove of the first receiving groove portion (230), the central axis of each first receiving through hole (251) is perpendicular to the length direction of the correcting bone plate (200), two adjacent first receiving through holes (251) are communicated, all the first receiving through holes (251) are sequentially arranged along the length direction of the correcting bone plate (200), and all the first receiving through holes (251) form first hole channels;

at least one second receiving through hole (252) is formed in the bottom surface of the first groove of the first receiving groove part (230), the central axis of each second receiving through hole (252) is perpendicular to the length direction of the correcting bone plate (200), two adjacent second receiving through holes (252) are communicated, and all the second receiving through holes (252) are sequentially arranged along the length direction of the correcting bone plate (200); all the second receiving through holes (252) form second hole channels; the second hole channel is opposite to the first hole channel;

the end of the first hole remote from the second hole extends through the end of the corrective bone plate (200), and the end of the second hole remote from the first hole extends through the end of the corrective bone plate (200);

each locking component (300) is provided with an installation through hole (310), and the hole wall of each installation through hole (310) is provided with an installation internal thread;

the correcting bone plate (200) is sleeved on the eccentric columns (130) of the two eccentric screws, the connecting heads (120) of the two eccentric screws are abutted in the second bearing groove part (240) of the second plate bearing surface (220), and two notch planes (123) of each eccentric screw are respectively contacted with the corresponding second bearing groove wall (241) of the second bearing groove part (240); the mounting internal threads of the two locking components (300) are respectively connected with the corresponding head-offset external threads (131) of the head-offset screw, and the two locking components (300) are abutted to the first plate bearing surface (210).

7. The spinal correction fixation system of claim 6, wherein: the correcting bone plate (200) is provided with two opposite concave grooves (260), and the two concave grooves (260) are sequentially arranged along the width direction of the correcting bone plate (200).

8. The spinal correction fixation system of claim 6, wherein: further comprising:

two auxiliary extensions, each comprising a connecting tube (410), a reinforcing rod (420) and an extension tube (430);

the extension pipe (430) is detachably connected with the corresponding eccentric column (130) through the connecting pipe (410);

the connection pipe (410) includes a main pipe part (411) and a mounting pipe part (412) connected with the main pipe part (411);

the extension pipe (430) is sleeved on one end of the main pipe fitting (411) far away from the mounting pipe fitting (412); a pipe external thread (413) is arranged on the mounting pipe (412); the pipe fitting external thread (413) is connected with the eccentric head internal thread; an axial through hole (414) is arranged on the connecting pipe (410);

the reinforcing rod (420) is inserted into the extension pipe (430), the axial through hole (414) is used for the reinforcing rod (420) to be inserted, and the reinforcing rod (420) is in clearance fit with the axial through hole (414); and a limiting flange (421) is arranged on the outer side surface of the reinforcing rod (420).

9. A screw installation tool for installing an offset head screw according to any one of claims 1 to 5; the method is characterized in that: the screw installation tool comprises a handle (510), a support rod (520), an intermediate sleeve (530) and an outer sleeve (540);

the upper end of the supporting rod (520), the upper end of the middle sleeve (530) and the upper end of the outer sleeve (540) are connected with the lower end of the handle (510), the middle sleeve (530) is sleeved outside the supporting rod (520), the outer sleeve (540) is sleeved outside the middle sleeve (530), and the supporting rod (520), the middle sleeve (530) and the outer sleeve (540) are coaxially arranged;

the lower end of the supporting rod (520) is provided with a supporting head (521), the supporting head (521) is used for being inserted into the positioning installation groove (133), and the supporting head (521) is in clearance fit with the positioning installation groove (133);

at least three separation grooves (531) are formed along the lower end of the middle sleeve (530), all the separation grooves (531) are uniformly arranged along the circumferential direction of the middle sleeve (530), and the extending direction of each separation groove (531) is parallel to the axial direction of the middle sleeve (530); a lower support flange (532) is arranged on the lower end of the inner side surface of the middle sleeve (530) in the circumferential direction, an upper support flange (533) is further arranged on the inner side surface of the middle sleeve (530), the upper support flange (533) is arranged along the circumferential direction of the inner side surface of the middle sleeve (530), the upper support flange (533) is positioned above the lower support flange (532), and an accommodating cavity is defined by the upper support flange (533), the lower support flange (532) and the inner side surface of the middle sleeve (530); an intermediate body through groove (534) is formed in the outer side face of the intermediate sleeve (530), and the intermediate body through groove (534) penetrates through the lower end of the intermediate sleeve (530);

an outer tube through groove (541) is formed in the outer side face of the outer sleeve (540), and the outer tube through groove (541) penetrates through the lower end of the outer sleeve (540); the outer tube through groove (541) is communicated with the intermediate body through groove (534), and the lower end of the outer sleeve (540) is positioned above the lower end of the intermediate sleeve (530);

the eccentric head column (130) of the eccentric head screw penetrates through the outer pipe through groove (541) and the intermediate body through groove (534) to enter the inner part of the intermediate sleeve (530), the supporting head (521) is inserted into the positioning installation groove (133), and the connecting head (120) of the eccentric head screw is placed into the accommodating cavity.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a head-biased screw, a spine correction fixing system and a screw mounting tool.

Background

Scoliosis is a curvature of one or several segments of the spine laterally off the body midline in the coronal plane, resulting in a spinal deformity with curvature. When the angle of the lateral curvature of the spine of the patient exceeds a certain angle, the patient needs to be treated by an operation. In the existing scoliosis fusion correction operation, after a fusion cage is implanted into a vertebral column, a straight screw is usually implanted into a vertebral body. In order to facilitate the correction of the laterally bent vertebral body and to make the operation opening smaller, the axial direction of the straight screw implanted into the vertebral body needs to be perpendicular to the axial direction of the vertebral body, and the position of the straight screw implanted into the vertebral body is generally positioned at the axial edge of the vertebral body, so that the straight screw is easy to penetrate through the vertebral body when being implanted into the vertebral body. How to design a screw structure which has small surgical incision, is not easy to puncture the vertebral body and is convenient for installation is a problem to be solved by the technical personnel in the field.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention solves the technical problem of providing an offset head screw, a spinal correction fixation system and a screw installation tool, which have small surgical incision, are not easy to penetrate through vertebral bodies and are convenient to install.

To achieve the above and other related objects, the present invention provides an offset head screw, comprising: the main nail rod, the connector and the offset column; the connector is of a hemispherical structure, and two opposite side surfaces of the connector are a hemispherical surface and a connecting surface respectively; the main nail rod is connected with the connecting surface of the connector, the eccentric column is connected with the hemispherical surface of the connector, the central axis of the main nail rod, the central axis of the connector and the central axis of the eccentric column are all in the same plane, the central axis of the eccentric column is collinear with the central axis of the connector, and the central axis of the main nail rod is obliquely arranged relative to the central axis of the eccentric column; the outer side surface of the eccentric head column is provided with an eccentric head external thread; one end of the head-biased column, which is far away from the connector, is provided with a positioning hole, and head-biased internal threads are arranged on the positioning hole; the central axis of the positioning hole is collinear with the central axis of the eccentric column;

be equipped with the location mounting groove on the head post partially, location mounting groove extending direction does the length direction of location mounting groove, the location mounting groove extends to the connector, the location mounting groove with the locating hole intercommunication.

Preferably, the first positioning groove wall in the length direction of the positioning installation groove is located on the connecting head, the first positioning groove wall is a plane, and the positioning groove wall is perpendicular to the central axis of the connecting head.

Furthermore, a plane passing through the central axis of the eccentric column and the positioning installation groove is a first middle plane, and the eccentric screw has a symmetrical structure with the first middle plane as a middle axis plane.

Furthermore, two parallel notch planes are arranged on the outer peripheral surface of the connector, and the positioning installation groove is positioned between the two notch planes.

Preferably, the outer circumferential surface of the eccentric column is provided with a screw intercepting groove.

The invention also relates to a spinal correction fixation system comprising: the correcting bone plate, two locking components and two eccentric screws;

the correcting bone plate is of a long strip-shaped structure, and a first plate bearing surface and a second plate bearing surface which are oppositely and parallelly arranged are arranged on the correcting bone plate;

the first plate bearing surface is provided with a first bearing groove part, two ends of the first bearing groove part along the length direction of the correction bone plate are communicated, and two first bearing groove walls in the width direction of the first bearing groove part are parallel;

a second bearing groove part is arranged on the bearing surface of the second plate, two ends of the second bearing groove part along the length direction of the correction bone plate are penetrated, and two second bearing groove walls in the width direction of the second bearing groove part are parallel; the distance between the two second adapting groove walls is equal to the distance between the two notch planes of the offset head screw;

at least one first bearing through hole is arranged on the bottom surface of the first groove of the first bearing groove part, the central axis of each first bearing through hole is perpendicular to the length direction of the correction bone plate, two adjacent first bearing through holes are communicated, all the first bearing through holes are sequentially arranged along the length direction of the correction bone plate, and all the first bearing through holes form first pore channels;

at least one second receiving through hole is formed in the bottom surface of the first groove of the first receiving groove, the central axis of each second receiving through hole is perpendicular to the length direction of the correction bone plate, two adjacent second receiving through holes are communicated, and all the second receiving through holes are sequentially arranged along the length direction of the correction bone plate; all the second bearing through holes form second pore channels; the second hole channel is opposite to the first hole channel;

the end of the first hole remote from the second hole extends through the end of the corrective bone plate and the end of the second hole remote from the first hole extends through the end of the corrective bone plate.

Each locking component is provided with an installation through hole, and an installation internal thread is arranged on the hole wall of each installation through hole;

the correcting bone plate is sleeved on the eccentric columns of the two eccentric screws, the connectors of the two eccentric screws are abutted against the second bearing groove part of the bearing surface of the second plate, and two notch planes of each eccentric screw are respectively contacted with the corresponding second bearing groove wall of the second bearing groove part; the mounting internal threads of the two locking components are respectively connected with the corresponding offset head external threads of the offset head screw, and the two locking components are abutted against the first plate bearing surface.

Preferably, the correcting bone plate is provided with two oppositely arranged concave grooves which are arranged in sequence along the width direction of the correcting bone plate.

Preferably, the spinal correction fixation system further comprises:

two auxiliary extension pieces, each of which comprises a connecting pipe, a reinforcing rod and an extension pipe;

the extension pipe is detachably connected with the corresponding eccentric column through the connecting pipe;

the connecting pipe comprises a main pipe fitting and a mounting pipe fitting connected with the main pipe fitting; the extension pipe is sleeved on one end of the main pipe fitting, which is far away from the installation pipe fitting; the mounting pipe fitting is provided with a pipe fitting external thread; the external thread of the pipe fitting is connected with the internal thread of the eccentric head part; the connecting pipe is provided with an axial through hole;

the reinforcing rod is inserted into the extension pipe, the axial through hole is used for the reinforcing rod to be inserted into, and the reinforcing rod is in clearance fit with the axial through hole; and a limiting flange is arranged on the outer side surface of the reinforcing rod.

The invention also relates to a screw mounting tool, which is used for mounting the offset head screw; the screw mounting tool comprises a handle, a support rod, a middle sleeve and an outer sleeve;

the upper end of the supporting rod, the upper end of the middle sleeve and the upper end of the outer sleeve are all connected with the lower end of the handle, the middle sleeve is sleeved outside the supporting rod, the outer sleeve is sleeved outside the middle sleeve, and the supporting rod, the middle sleeve and the outer sleeve are coaxially arranged;

the lower end of the supporting rod is provided with a supporting head, the supporting head is used for being inserted into the positioning installation groove, and the supporting head is in clearance fit with the positioning installation groove;

at least three separating grooves are formed along the lower end of the middle sleeve, all the separating grooves are uniformly arranged along the circumferential direction of the middle sleeve, and the extending direction of each separating groove is parallel to the axial direction of the middle sleeve; the lower end of the inner side surface of the middle sleeve is circumferentially provided with a lower supporting flange, the inner side surface of the middle sleeve is also provided with an upper supporting flange, the upper supporting flange is arranged along the circumferential direction of the inner side surface of the middle sleeve, the upper supporting flange is positioned above the lower supporting flange, and an accommodating cavity is defined by the upper supporting flange, the lower supporting flange and the inner side surface of the middle sleeve; an intermediate through groove is formed in the outer side surface of the intermediate sleeve and penetrates through the lower end of the intermediate sleeve;

an outer tube through groove is formed in the outer side surface of the outer sleeve and penetrates through the lower end of the outer sleeve; the outer tube through groove is communicated with the intermediate body through groove, and the lower end of the outer sleeve is positioned above the lower end of the intermediate sleeve;

the head-biased column of the head-biased screw penetrates through the outer tube through groove and the intermediate body through groove and enters the inner part of the intermediate sleeve, the supporting head is inserted into the positioning installation groove, and the connector of the head-biased screw is placed into the accommodating cavity.

As described above, the offset head screw, the spinal correction fixation system and the screw installation tool of the present invention have the following advantageous effects:

when the offset head screw is used, after the fusion cage is implanted into the spine, the main screw rod of one offset head screw is implanted into a laterally bent vertebral body, and the main screw rod of the other offset head screw is implanted into a non-laterally bent vertebral body adjacent to the laterally bent vertebral body; the central axis of the eccentric columns of the two eccentric screws is vertical to the axial direction of the implanted vertebral body, and one end of the eccentric column far away from the connector faces outwards; adjusting the laterally bent vertebral body to enable the laterally bent vertebral body to reach the corrected position; fixing the positions of the two eccentric screws, wherein the central axes of the eccentric columns of the two eccentric screws are parallel; because the central axis of the main nail rod is obliquely arranged relative to the central axis of the eccentric column, and the central axis of the main nail rod is obliquely arranged relative to the central axis of the implanted vertebral body, the connector is generally positioned at the axial end edge position of the vertebral body, namely the main nail rod is implanted into the vertebral body from the axial end edge position of the vertebral body, and the main nail rod implanted into the vertebral body is obliquely arranged relative to the axial direction of the vertebral body, so that the surgical incision is smaller, and the main nail rod is not easy to penetrate through the vertebral body in the implantation process of the main nail rod; the eccentric column is provided with a positioning installation groove, so that the eccentric screw and the screw installation tool can be conveniently assembled, and the eccentric screw can be conveniently and quickly installed.

Drawings

Fig. 1 is a schematic structural diagram illustrating two offset screws of the spinal correction and fixation system after correction of a laterally curved vertebral body according to the embodiment, wherein the two offset screws are respectively fixedly connected with two locking components.

Fig. 2 is a perspective view of the spinal correction fixation system of the present embodiment.

Fig. 3 is a schematic cross-sectional view of fig. 2.

Fig. 4 is an enlarged schematic view of a structure shown in fig. 3.

Fig. 5 is a schematic view of the corrective bone plate of the spinal corrective fixation system of this embodiment pressed against the connection heads of two offset screws.

Fig. 6 is a perspective view of the offset screw of the spinal correction fixation system of the present embodiment.

Fig. 7 is a perspective view of a corrective bone plate of the spinal corrective fixation system of this embodiment.

Fig. 8 is a perspective view of the offset head screw of the spinal correction fixation system of this embodiment inserted into a correction bone plate and fixedly connected to a locking member.

Fig. 9 is a schematic structural view showing a locking part of the spinal correction fixing system of the embodiment.

Fig. 10 is a schematic structural view showing a connection pipe of the spinal correction fixing system according to the embodiment.

Fig. 11 is a schematic structural view showing an extension tube of the spinal correction fixation system according to the embodiment.

Fig. 12 is a schematic structural view showing a reinforcing rod of the spinal correction fixing system of the present embodiment.

Fig. 13 is a perspective view of the offset head screw of the present embodiment when installed in the screw installation tool.

Fig. 14 is an enlarged schematic view of the structure at B of fig. 13.

Fig. 15 is a perspective view of the screw mounting tool according to the present embodiment.

Fig. 16 is an enlarged schematic view of the structure at C of fig. 15.

Fig. 17 is a perspective view of the screw mounting tool of the present embodiment without the outer sleeve.

Fig. 18 is an enlarged schematic view of fig. 17 at D.

Fig. 19 is a schematic cross-sectional view of fig. 1.

Description of the reference numerals

10 vertebral body

110 main nail rod

120 connector

121 hemispherical surface

122 connecting surface

123 notched plane

130 offset head column

131 offset head external screw thread

132 positioning hole

133 positioning installation groove

1331 first retaining groove wall

134 screw truncation recess

200 correction bone plate

210 first plate receiving surface

220 second board bearing surface

230 first receiving groove part

231 first receiving groove wall

240 second receiving groove part

241 second receiving groove wall

251 first receiving through hole

252 second receiving through hole

260 concave groove

300 locking part

310 mounting through hole

320 pressing joint

330 installing joint

410 connecting pipe

411 Main pipe

412 installation pipe fitting

413 pipe external thread

414 axial through hole

420 reinforcing bar

421 position-limiting flange

430 extension tube

510 handle

520 support rod

521 support head

522 inserting surface

530 middle sleeve

531 separating groove

532 lower support flange

533 upper support flange

534 intermediate body through groove

540 outer sleeve

541 outer tube through groove

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to the attached drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1 to 19, the offset head screw of the present embodiment includes: a main nail shaft 110, a connector 120 and a head biasing column 130; the connector 120 is of a hemispherical structure, and two opposite side surfaces of the connector 120 are a hemispherical surface 121 and a connecting surface 122 respectively; the main nail rod 110 is connected with the connecting surface 122 of the connector 120, the offset column 130 is connected with the hemispherical surface 121 of the connector 120, the central axis of the main nail rod 110, the central axis of the connector 120 and the central axis of the offset column 130 are all in the same plane, the central axis of the offset column 130 and the central axis of the connector 120 are collinear, and the central axis of the main nail rod 110 is obliquely arranged relative to the central axis of the offset column 130; the outer side surface of the eccentric column 130 is provided with an eccentric external thread 131; one end of the head-biased column 130 far away from the connector 120 is provided with a positioning hole 132, and the positioning hole 132 is provided with head-biased internal threads; the central axis of the positioning hole 132 is collinear with the central axis of the offset head column 130;

be equipped with location mounting groove 133 on the head post 130 partially, location mounting groove 133 extending direction is the length direction of location mounting groove 133, and location mounting groove 133 extends to connector 120, and location mounting groove 133 communicates with locating hole 132. The length direction of the positioning installation groove 133 is parallel to the axial direction of the positioning installation groove 133.

When the offset head screw is used, after the fusion cage is implanted into the spine, the main screw rod 110 of one offset head screw is implanted into the vertebral body 10 which is already laterally bent, and the main screw rod 110 of the other offset head screw is implanted into the vertebral body 10 which is not laterally bent and is adjacent to the vertebral body 10 which is already laterally bent; the central axis of the offset column 130 of the two offset screws is perpendicular to the axial direction of the implanted vertebral body 10, and one end of the offset column 130 far away from the connector 120 faces outwards; adjusting the laterally curved vertebral body 10 to achieve a corrected position of the laterally curved vertebral body 10; fixing the positions of the two offset head screws, wherein the central axes of the offset head columns 130 of the two offset head screws are parallel; because the central axis of the main nail rod 110 is obliquely arranged relative to the central axis of the eccentric column 130, and the central axis of the main nail rod 110 is obliquely arranged relative to the central axis of the implanted vertebral body 10, the connector 120 is generally at the axial end edge position of the vertebral body 10, that is, the main nail rod 110 is implanted into the vertebral body 10 from the axial end edge position of the vertebral body 10, and the main nail rod 110 implanted into the vertebral body 10 is obliquely arranged relative to the axial direction of the vertebral body 10, so that the surgical incision is small, and in the implantation process of the main nail rod 110, the main nail rod 110 is not easy to penetrate through the vertebral body 10; the offset head column 130 is provided with a positioning installation groove 133, so that the offset head screw and a screw installation tool can be conveniently assembled, and the offset head screw can be quickly installed.

The first positioning groove wall 1331 in the length direction of the positioning installation groove 133 is located on the connecting head 120, the first positioning groove wall 1331 is a plane, and the positioning groove wall is perpendicular to the central axis of the connecting head 120. This configuration facilitates the face contact of the screw installation tool with the attachment head 120 of the offset head screw.

The plane passing through the central axis of the eccentric column 130 and the positioning installation groove 133 is a first middle plane, and the eccentric screw has a symmetrical structure taking the first middle plane as a central axis plane. The structure is convenient for processing the offset head screw.

Two parallel notch planes 123 are arranged on the outer peripheral surface of the connector 120, and the positioning installation groove 133 is located between the two notch planes 123. This configuration facilitates stable clamping of the corrective bone plate 200 to the connector 120.

The outer circumferential surface of the head post 130 is provided with a screw intercepting groove 134. The screw intercepting groove 134 facilitates the interception of the eccentric column 130. The screw intercepting groove 134 is a V-shaped groove to facilitate the interception of the eccentric column 130.

The invention also relates to a spinal correction fixation system comprising: a corrective bone plate 200, two locking members 300 and two lag screws;

the correcting bone plate 200 is in a strip-shaped structure, and the correcting bone plate 200 is provided with a first plate bearing surface 210 and a second plate bearing surface 220 which are oppositely and parallelly arranged;

the first plate receiving surface 210 is provided with a first receiving groove portion 230, both ends of the first receiving groove portion 230 in the longitudinal direction of the orthopedic bone plate 200 penetrate through the first receiving groove portion 230, and two first receiving groove walls 231 in the width direction of the first receiving groove portion 230 are parallel;

the second plate receiving surface 220 is provided with a second receiving groove portion 240, both ends of the second receiving groove portion 240 in the longitudinal direction of the orthopedic bone plate 200 penetrate through the second plate receiving surface, and two second receiving groove walls 241 in the width direction of the second receiving groove portion 240 are parallel; the distance between the two second receiving groove walls 241 is equal to the distance between the two notch planes 123 of the offset head screw;

at least one first receiving through hole 251 is arranged on the bottom surface of the first groove of the first receiving groove part 230, the central axis of each first receiving through hole 251 is perpendicular to the length direction of the correcting bone plate 200, two adjacent first receiving through holes 251 are communicated, all the first receiving through holes 251 are sequentially arranged along the length direction of the correcting bone plate 200, and all the first receiving through holes 251 form first hole channels;

at least one second receiving through hole 252 is formed in the bottom surface of the first groove of the first receiving groove part 230, the central axis of each second receiving through hole 252 is perpendicular to the length direction of the correcting bone plate 200, two adjacent second receiving through holes 252 are communicated, and all the second receiving through holes 252 are sequentially arranged along the length direction of the correcting bone plate 200; all of the second receiving through holes 252 form second ducts; the second pore passage is arranged opposite to the first pore passage; in this embodiment, there is one first receiving through hole 251; there are three second receiving through holes 252.

The end of the first hole distal to the second hole extends through the end of the bone plate 200 and the end of the second hole distal to the first hole extends through the end of the bone plate 200.

Each locking component 300 is provided with an installation through hole 310, and the hole wall of the installation through hole 310 is provided with an installation internal thread;

the correcting bone plate 200 is sleeved on the offset-head posts 130 of the two offset-head screws, the connectors 120 of the two offset-head screws are abutted against the second bearing groove parts 240 of the bearing surfaces 220 of the second plate, and the two notch planes 123 of each offset-head screw are respectively contacted with the corresponding second bearing groove walls 241 of the second bearing groove parts 240; the mounting internal threads of the two locking components 300 are respectively connected with the eccentric head external threads 131 of the corresponding eccentric head screws, and the two locking components 300 are abutted against the first plate receiving surface 210.

When the spinal correction fixation system of the present embodiment is used, after two eccentric screws are implanted into two vertebral bodies 10, one of the first receiving through holes 251 of the correction bone plate 200 is sleeved on the eccentric column 130 of the eccentric screw implanted into the vertebral body 10 which is not laterally bent, and the two second receiving groove walls 241 of the second receiving groove portion 240 of the correction bone plate 200 are in contact with the two notch planes 123 of the eccentric screw implanted into the vertebral body 10 which is not laterally bent, respectively; adjusting the laterally bent vertebral body 10 to achieve the corrected position of the laterally bent vertebral body 10, and simultaneously inserting the setscrew implanted in the corrected vertebral body 10 into one of the second receiving through holes 252 of the correction bone plate 200, wherein the two second receiving groove walls 241 of the second receiving groove portion 240 of the correction bone plate 200 are respectively in contact with the two notch planes 123 of the setscrew implanted in the corrected vertebral body 10; the two locking components 300 are respectively in threaded connection with the offset columns 130 of the two offset screws, and the two locking components 300 are abutted against the first plate receiving surface 210.

The end of the first hole distal to the second hole extends through the end of the bone plate 200 and the end of the second hole distal to the first hole extends through the end of the bone plate 200. The corrective bone plate 200 has open structure at both ends in the longitudinal direction, which facilitates insertion of the lag screw into the corrective bone plate 200.

The correcting bone plate 200 is provided with two oppositely disposed concave grooves 260, and the two concave grooves 260 are sequentially disposed along the width direction of the correcting bone plate 200. The recessed groove 260 is adapted to be grasped by a clamping instrument. In this embodiment, the concave groove 260 is a kidney-shaped groove.

The first receiving through-hole 251 and the second receiving through-hole 252 have the same size, and the first receiving through-hole 251 is a circular hole. Since the main shank 110 is cylindrical and the first receiving through-hole 251 is a circular hole, the structure facilitates insertion of the main shank 110 into the dimensions of the first receiving through-hole 251 and the second receiving through-hole 252.

The plane having the same distance between the first plate receiving surface 210 and the second plate receiving surface 220 is a second middle plane, and the orthopedic bone plate 200 has a symmetrical structure with the second middle plane as a central axis plane. This configuration facilitates the machining and installation of the corrective bone plate 200.

Spinal corrective fixation system, further comprising:

two auxiliary extensions, each comprising a connection pipe 410, a reinforcement bar 420, and an extension pipe 430;

the extension tube 430 is detachably connected with the corresponding offset head column 130 through the connection tube 410;

the connection pipe 410 includes a main pipe 411 and a mounting pipe 412 connected to the main pipe 411; the extension pipe 430 is fitted over an end of the main pipe 411 remote from the installation pipe 412; the mounting pipe 412 is provided with a pipe external thread 413; the pipe fitting external thread 413 is connected with the eccentric head internal thread; the connecting pipe 410 is provided with an axial through hole 414;

the reinforcing rod 420 is inserted into the extension pipe 430, the axial through hole 414 is used for inserting the reinforcing rod 420, and the reinforcing rod 420 is in clearance fit with the axial through hole 414; the outer side surface of the reinforcing rod 420 is provided with a limit flange 421.

The extension tube 430 is connected to the corresponding offset head column 130 via the connection tube 410, so as to facilitate adjustment of the laterally bent vertebral body 10, so that the laterally bent vertebral body 10 reaches a corrected position, i.e. the laterally bent vertebral body 10 is pressurized by the auxiliary extension member to restore the laterally bent vertebral body 10 to a position parallel to the un-laterally bent vertebral body 10; the two head-biased screws are respectively driven on the edge of the vertebral body 10, so that the size of a titanium plate is minimized, the notch is reduced, the head-biased column 130 exposed out of the bone surface is parallel to the end plate, the main nail rod 110 is driven into the vertebral body 10 in a certain angle, and the anti-pull-out effect is good.

The auxiliary extension piece arranged on the head-biased column 130 of the head-biased screw is convenient for a doctor to pressurize outside the body, install a titanium plate and install the locking component 300, is simple and convenient to operate, can be completed under direct vision without X-ray fluoroscopy, shortens the operation time and greatly increases the safety.

Since the extension pipe 430 is generally a hose, the reinforcing rod 420 is inserted into the extension pipe 430, which can reinforce the strength of the auxiliary extension.

In this embodiment, the locking member 300 includes a compression joint 320 and a mounting joint 330 connected to each other, and the mounting joint 330 is provided with a joint-portion-intercepting groove 321. The fitting portion intercepting groove 321 facilitates the interception of the installation fitting 330. The compression fitting 320 is adapted to press against the first panel receiving surface 210.

The invention also relates to a screw mounting tool for mounting the offset head screw; the screw installation tool includes a handle 510, a support rod 520, an intermediate sleeve 530, and an outer sleeve 540;

the upper end of the support rod 520, the upper end of the middle sleeve 530 and the upper end of the outer sleeve 540 are all connected with the lower end of the handle 510, the middle sleeve 530 is sleeved outside the support rod 520, the outer sleeve 540 is sleeved outside the middle sleeve 530, and the support rod 520, the middle sleeve 530 and the outer sleeve 540 are coaxially arranged;

the lower end of the supporting rod 520 is provided with a supporting head 521, the supporting head 521 is used for being inserted into the positioning installation groove 133, and the supporting head 521 is in clearance fit with the positioning installation groove 133;

at least three separation grooves 531 are formed along the lower end of the intermediate sleeve 530, all the separation grooves 531 are uniformly arranged along the circumferential direction of the intermediate sleeve 530, and the extending direction of each separation groove 531 is parallel to the axial direction of the intermediate sleeve 530; a lower support flange 532 is circumferentially arranged at the lower end of the inner side surface of the middle sleeve 530, an upper support flange 533 is further arranged on the inner side surface of the middle sleeve 530, the upper support flange 533 is arranged along the circumferential direction of the inner side surface of the middle sleeve 530, the upper support flange 533 is positioned above the lower support flange 532, and an accommodating cavity is defined by the inner side surfaces of the upper support flange 533, the lower support flange 532 and the middle sleeve 530; an intermediate body through groove 534 is formed in the outer side face of the intermediate sleeve 530, and the intermediate body through groove 534 penetrates through the lower end of the intermediate sleeve 530;

an outer tube through groove 541 is arranged on the outer side surface of the outer sleeve 540, and the outer tube through groove 541 penetrates through the lower end of the outer sleeve 540; the outer tube through groove 541 is communicated with the intermediate body through groove 534, and the lower end of the outer sleeve 540 is positioned above the lower end of the intermediate sleeve 530;

the offset column 130 of the offset screw passes through the outer tube through groove 541 and the intermediate body through groove 534 to enter the inside of the intermediate sleeve 530, the support head 521 is inserted into the positioning installation groove 133, and the connector 120 of the offset screw is placed into the accommodating cavity.

At least three separation grooves 531 are formed along the lower end of the intermediate sleeve 530, all the separation grooves 531 are uniformly arranged along the circumferential direction of the intermediate sleeve 530, and the extending direction of each separation groove 531 is parallel to the axial direction of the intermediate sleeve 530; in the process of inserting the screw into the screw installation tool, the lower end of the middle sleeve 530 is spread, so that the offset column 130 of the screw passes through the outer tube through groove 541 and the middle body through groove 534 to enter the middle sleeve 530, the support head 521 is inserted into the positioning installation groove 133, and the connector 120 of the screw is placed into the accommodating cavity. The supporting head 521 is in clearance fit with the positioning installation groove 133, and the connecting head 120 of the offset screw is placed in the accommodating cavity, so that the offset screw is stably connected with the screw installation tool, and the offset screw can be installed in the vertebral body 10 by holding the screw installation tool with hands. The outer tube through groove 541 is communicated with the intermediate body through groove 534, and the lower end of the outer tube 540 is positioned above the lower end of the intermediate tube 530, so that the outer tube 540 can clamp the intermediate tube 530, which is beneficial to stably connecting the offset head screw and the screw installation tool.

In this embodiment, the number of the partition grooves 531 is four.

The positioning fitting groove 133 has a U-shaped cross section, and the side surface of the support head 521 inserted into the positioning fitting groove 133 is an insertion surface 522, the insertion surface 522 being a semi-circular shape, which facilitates the insertion of the support head 521 into the positioning fitting groove 133 and enables the support head 521 to be stably coupled with the positioning fitting groove 133. When the lag screw is mounted to the screw mounting tool, the lower end of the support head 521 is a flat surface, and the lower end of the support head 521 is in contact with the first positioning groove wall 1331.

The invention discloses a using method of a spinal correction fixing system, which comprises the following steps:

1) after the fusion cage is implanted into the spine, the main nail shaft 110 of one of the offset screws is implanted into the already laterally curved vertebral body 10, and the main nail shaft 110 of the other offset screw is implanted into the non-laterally curved vertebral body 10 adjacent to the already laterally curved vertebral body 10; the two eccentric screws are adjusted clockwise or anticlockwise in the implantation process, so that the central axes of the eccentric columns 130 of the two eccentric screws are vertical to the axial direction of the implanted vertebral body 10, and one ends of the eccentric columns 130, which are far away from the connecting head 120, face outwards;

2) an auxiliary extension piece is arranged on the head biasing column 130 of each head biasing screw;

3) one of the first receiving through holes 251 of the corrective bone plate 200 is fitted over the offset post 130 of the offset screw implanted in the non-laterally curved vertebral body 10, and the two second receiving groove walls 241 of the second receiving groove portion 240 of the corrective bone plate 200 are in contact with the two notch planes 123 of the offset screw implanted in the non-laterally curved vertebral body 10, respectively;

4) adjusting the laterally bent vertebral body 10 to achieve the corrected position of the laterally bent vertebral body 10, and simultaneously inserting the setscrew implanted in the corrected vertebral body 10 into one of the second receiving through holes 252 of the correction bone plate 200, wherein the two second receiving groove walls 241 of the second receiving groove portion 240 of the correction bone plate 200 are respectively in contact with the two notch planes 123 of the setscrew implanted in the corrected vertebral body 10;

5) the locking members 300 are inserted along the two auxiliary extension pieces, the two locking members 300 are respectively in threaded connection with the offset columns 130 of the two offset screws, and the two locking members 300 are both abutted against the first plate receiving surface 210.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.