CN113384335B - Eccentric screw and spinal correction fixing system - Google Patents
Eccentric screw and spinal correction fixing system Download PDFInfo
- Publication number
- CN113384335B CN113384335B CN202110565151.1A CN202110565151A CN113384335B CN 113384335 B CN113384335 B CN 113384335B CN 202110565151 A CN202110565151 A CN 202110565151A CN 113384335 B CN113384335 B CN 113384335B
- Authority
- CN
- China
- Prior art keywords
- groove
- head
- offset
- connector
- hemispherical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B2017/7073—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant with intervertebral connecting element crossing an imaginary spinal median surface
Abstract
The invention provides an offset head screw and a spine correction fixing system, 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 pole of nailing with the connection face of connector is connected, the head post on an inclined basis with the hemisphere face of connector is connected, the main axis of nailing the pole the axis of connector with the axis of head post on an inclined basis all is in the coplanar, the axis of head post on an inclined basis with the axis collineation of connector, the axis of main nail pole for the axis of head post sets up for the slope on an inclined basis. The eccentric screw and the spine correction and fixation 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.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a head-biased screw and a spinal column correction fixing system.
Background
Scoliosis is a curvature of the spine in one or more segments of the spine laterally offset from the body's 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 device is implanted into a spine, 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 makes the surgical incision smaller and does not easily penetrate through the vertebral body 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 a bone screw and a spinal correction fixation system with a small surgical incision and with less difficulty in penetrating vertebral bodies.
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 pole of nailing with the connection face of connector is connected, head post on the side with the hemisphere face of connector is connected, the main axis of nailing the pole the axis of connector with the axis of head post on the side all is in the coplanar, the axis of head post on the side with the axis collineation of connector, the axis of main nail pole for the axis of head post sets up for the slope on the side.
Preferably, an offset external thread is arranged on the outer side surface of the offset column.
Furthermore, along the circumference of the eccentric head threaded rod, a cut-off groove is formed in the outer circumferential surface of the eccentric head threaded rod.
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 bearing groove part, and the second plate bearing surface is provided with a semi-spherical surface for the eccentric column to be placed in the containing groove part;
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, and the connectors of the two eccentric screws are abutted against the receiving grooves of the bearing surface of the second plate; the mounting internal threads of the two locking parts are respectively connected with the corresponding eccentric head external threads of the eccentric head screw, and the two locking parts are abutted against the bearing groove part.
Preferably, the receiving groove part comprises an installation groove group and hemispherical concave grooves respectively communicated with two ends of the installation groove group in the length direction; the mounting groove group comprises a plurality of arc-shaped concave grooves which are sequentially connected along the length direction of the bearing surface of the first plate piece, and the curvature radius of each arc-shaped concave groove is equal to that of the hemispherical concave groove; a spherical groove round through hole is formed in the bottom surface of each hemispherical concave groove; each arc-shaped concave groove is provided with an arc-shaped groove circular through hole, and all the arc-shaped groove circular through holes are communicated with each other; the central axes of all the arc-groove circular through holes and the central axes of all the ball-groove circular through holes are positioned on the same plane; the plane where the central axes of all the arc-groove circular through holes are located is a first middle plane, the first middle plane is parallel to the length direction of the correction bone plate, and the correction bone plate is of a symmetrical structure with the first middle plane as a middle axis plane; the two spherical groove circular through holes are respectively communicated with the adjacent arc groove circular through holes;
each locking component comprises a compression joint and an installation joint which are connected, the side surface of the compression joint, which is far away from the installation joint, is a hemispherical outer side surface, and the curvature radius of the hemispherical outer side surface is equal to that of the hemispherical concave groove; the hemispherical outer side surface of the compression joint is abutted against the bearing groove part.
Further, a plane equal to the distance between the first plate receiving surface and the second plate receiving surface is a second middle plane, and the correcting bone plate is of a symmetrical structure with the second middle plane as a central axis plane.
Preferably, the spinal correction fixing system further comprises: the auxiliary extension pieces comprise connecting pipes and extension pipes, and the extension pipes are detachably connected with the corresponding eccentric columns through the connecting pipes.
Further, the connecting pipe comprises a main pipe fitting and a mounting pipe fitting connected with the main pipe fitting; the mounting pipe fitting is provided with a pipe fitting external thread; the inclined-head column is provided with an inclined-head internal thread, and the pipe fitting external thread is connected with the inclined-head internal thread.
Preferably, the spinal correction fixing system further comprises a reinforcing rod for penetrating into the extension tube.
As mentioned above, the eccentric screw and the spinal correction fixing system of the invention have the following beneficial effects:
when the offset head screw and the spine correction and fixation system are 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 axis of main nail pole is for the axis of inclined to one side head post sets up, and the axis of main nail pole is for the axis of the centrum of implanting inclined to one side, then the connector generally is in the axial tip border position of centrum, and main nail pole implants the centrum from the axial tip border position of centrum promptly, and the main nail pole of implanting the centrum is inclined to one side for the axial of centrum sets up, and this just makes the operation incision less, and main nail pole implantation in-process, and main nail pole is difficult to puncture the centrum.
Drawings
Fig. 1 is a schematic structural view of two eccentric screws of the spinal correction fixing system of the embodiment implanted into a cone.
Fig. 2 is a perspective view of the offset screw of the spinal correction fixation system of the present embodiment.
Fig. 3 is a schematic structural view illustrating the connection between the offset head screw and the extension tube through the connection tube in the spinal correction fixation system according to the embodiment.
Fig. 4 is a schematic structural view showing a connection pipe of the spinal correction fixing system according to the embodiment.
Figure 5 is a schematic view of the corrective bone plate of the spinal corrective fixation system of this embodiment in a configuration in which it fits over two offset head screws.
Fig. 6 shows a schematic structural view of a corrective bone plate of the spinal corrective fixation system of this embodiment.
FIG. 7 is a schematic view of the insertion of the offset post of the offset screw of the spinal correction fixation system of this embodiment into the receiving slot of the corrective bone plate.
Fig. 8 is a schematic view of the embodiment of the spinal correction fixation system showing the insertion of the connection head of the offset screw into the receiving slot of the correction bone plate.
Fig. 9 is a structural view illustrating the connection between the internal installation thread of one of the locking parts of the spinal correction fixation system of this embodiment and the external thread of the eccentric head column of the eccentric head screw implanted in the non-laterally bent vertebral body.
Fig. 10 is a schematic structural view showing a locking part of the spinal correction fixing system of the embodiment.
Fig. 11 is a schematic view showing the structure in which the female installation threads of the locking member of the spinal correction fixing system of this embodiment are coupled to the male offset threads of the offset head post of the offset head screw implanted in the corrected vertebral body.
Fig. 12 is a structural view showing a portion of an eccentric column intercepting two eccentric screws of the spinal correction fixing system of the present embodiment, which is positioned at an upper portion of a locking part.
Fig. 13 is a schematic structural view showing a reinforcing rod of the spinal correction fixing system according to the embodiment.
Description of the reference numerals
10. Vertebral body
110. Main nail rod
111. First nail body screw thread part
112. Second nail body screw thread part
120. Connecting head
121. Semi-spherical surface
122. Connecting surface
130. Head-biased column
131. Offset head external thread
132. Offset head internal thread
133. Round main rod
134. Threaded rod with inclined head
135. Truncation groove
200. Auxiliary extension piece
210. Connecting pipe
211. Main pipe fitting
2111. Intermediate pipe part
2112. Receiving pipe part
212. Mounting pipe fitting
213. External thread of pipe fitting
220. Extension pipe
300. Correction bone plate
310. The first plate receiving surface
320. Second plate receiving surface
330. Receiving groove part
331. Hemispherical concave groove
332. Arc-shaped concave groove
333. Spherical groove round through hole
334. Circular through hole with arc groove
340. Storage slot part
400. Locking member
410. Compression joint
420. Mounting joint
430. Mounting through hole
440. Mounting internal thread
450. Hemispherical lateral surface
500. Reinforcing bar
510. Tip end
520. Projection part
Central axis of L1 eccentric column
Central axis of L2 vertebral body
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 13, 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 a hemispherical structure, and two opposite side surfaces of the connector 120 are a hemispherical surface 121 and a connecting surface 122 respectively; the connecting surface 122 is a plane, the main nail rod 110 is connected with the connecting surface 122 of the connector 120, the eccentric 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 L1 of the eccentric column 130 are all located on the same plane, the central axis L1 of the eccentric column 130 is collinear with the central axis of the connector 120, and the central axis of the main nail rod 110 is inclined relative to the central axis L1 of the eccentric column 130. When the offset screw is screwed into the vertebral body 10, the offset screw is mounted with the central axis of the main shank 110 as the rotation axis.
When the offset head screw of the embodiment 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 L1 of the offset column 130 of the two offset screws is perpendicular to the axial direction of the implanted vertebral body 10, and the end of the offset column 130 far away from the connector 120 faces outward; adjusting the laterally curved vertebral body 10 such that the laterally curved vertebral body 10 reaches a corrected position; fixing the positions of the two offset head screws, wherein the central axes L1 of the offset head columns 130 of the two offset head screws are parallel; since the central axis of the main nail rod 110 is disposed obliquely with respect to the central axis L1 of the eccentric column 130, and the central axis of the main nail rod 110 is disposed obliquely with respect to the central axis L2 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 disposed obliquely with respect to the axial direction of the vertebral body 10, which makes the positions of the connectors 120 of the eccentric screws implanted into two adjacent vertebral bodies 10 closer, which makes the surgical incision smaller, and the main nail rod 110 is not easy to penetrate through the vertebral body 10 during the implantation of the main nail rod 110.
The outer side surface of the eccentric head column 130 is provided with an eccentric head external thread 131. Offset head external threads 131 facilitate the attachment of offset head post 130 to locking component 400.
The offset head post 130 includes a circular main post 133 and an offset head threaded rod 134; the two ends of the circular main rod 133 are connected with the eccentric threaded rod 134 and the connector 120 respectively. The eccentric threaded rod 134 is coupled to the locking unit 400, and the circular main rod 133 is inserted into the receiving groove 330. The offset external thread 131 is provided on the offset threaded rod 134.
A cut-off groove 135 is provided on the outer circumferential surface of the offset threaded rod 134 along the circumferential direction of the offset threaded rod 134. The cut-off groove 135 facilitates cutting off the offset threaded rod 134. The cut-off groove 135 is a V-shaped groove to facilitate cutting off the offset threaded rod 134.
The spinal correction fixation system of the present embodiment includes: a corrective bone plate 300, two locking members 400, and two lag screws; the locking members 400 correspond to the offset head screws one to one;
the correcting bone plate 300 is in a strip-shaped structure, and the correcting bone plate 300 is provided with a first plate receiving surface 310 and a second plate receiving surface 320 which are oppositely and parallelly arranged; the first board receiving surface 310 is provided with a receiving groove 330, and the second board receiving surface 320 is provided with a receiving groove 340 for the hemispherical surface 121 of the offset head column 130 to be placed in;
each locking component 400 is provided with an installation through hole 430, and the wall of the installation through hole 430 is provided with an installation internal thread 440;
the correcting bone plate 300 is sleeved on the offset-head columns 130 of the two offset-head screws, and the connectors 120 of the two offset-head screws are abutted against the accommodating groove parts 340 of the bearing surfaces 320 of the second plate; the mounting internal threads 440 of the two locking members 400 are respectively connected with the corresponding offset head external threads 131 of the offset head screw, and the two locking members 400 are abutted against the receiving groove portion 330.
When the spinal correction fixing system of the embodiment is used, after two eccentric screws are respectively implanted into two vertebral bodies 10, the correction bone plate 300 is sleeved on the two eccentric screws, and the correction bone plate 300 moves to the joint of the connector 120 and the eccentric column 130; inserting the connecting head 120 of the offset screw implanted in the unbent vertebral body 10 into the receiving groove 340 on the second plate receiving surface 320 of the correcting bone plate 300, inserting the offset column 130 of the offset screw implanted in the unbent vertebral body 10 into the receiving groove 330, inserting one of the extension tubes 220 into one of the locking members 400, wherein the mounting internal thread 440 of one of the locking members 400 is connected with the offset external thread 131 of the offset column 130 of the offset screw implanted in the unbent vertebral body 10, and one of the locking members 400 abuts against the receiving groove 330 of the correcting bone plate 300; adjusting the laterally curved vertebral body 10 such that the laterally curved vertebral body 10 reaches a corrected position; inserting another extension tube 220 into another locking component 400, wherein the mounting internal thread 440 of the other locking component 400 is connected with the offset external thread 131 of the offset column 130 of the offset screw implanted in the corrected vertebral body 10, at this time, the central axes L1 of the offset columns 130 of the two offset screws are parallel, and the central axis L1 of the offset column 130 of the offset screw implanted in the corrected vertebral body 10 is perpendicular to the first plate receiving surface 310 of the correction bone plate 300; after the two vertebral bodies 10 are adjusted, the offset head posts 130 of the two offset head screws are cut off at the upper portion of the locking assembly 400.
The receiving groove part 330 includes an installation groove group and a hemispherical concave groove 331 respectively communicated with both ends of the installation groove group in the length direction; the mounting groove group comprises a plurality of arc-shaped concave grooves 332 which are sequentially connected along the length direction of the first plate receiving surface 310, and the curvature radius of each arc-shaped concave groove 332 is equal to that of the hemispherical concave groove 331; a spherical groove circular through hole 333 is formed in the bottom surface of each hemispherical concave groove 331; each arc-shaped concave groove 332 is provided with an arc-shaped groove circular through hole 334, and all the arc-shaped groove circular through holes 334 are communicated with each other; the central axes of all the arc groove circular through holes 334 and the central axes of all the ball groove circular through holes 333 are in the same plane; the plane of the central axes of all the arc-groove circular through holes 334 is a first middle plane, the first middle plane is parallel to the length direction of the correction bone plate 300, and the correction bone plate 300 is a symmetrical structure with the first middle plane as the central axis plane; the two spherical groove circular through holes 333 are respectively communicated with the adjacent arc groove circular through holes 334;
each locking part 400 comprises a pressing joint 410 and a mounting joint 420 which are connected, the side of the pressing joint 410 away from the mounting joint 420 is a hemispherical outer side surface 450, and the radius of curvature of the hemispherical outer side surface 450 is equal to that of the hemispherical concave groove 331; the hemispherical outer side 450 of compression fitting 410 abuts in receiving groove 330.
The arc groove circular through hole 334 and the ball groove circular through hole 333 at the bottom of the receiving groove part 330 are used for the eccentric head column 130 of the eccentric head screw to pass through; the arcuate recess 332 and the hemispherical recess 331 of the receiving slot portion 330 allow the locking member 400 to be inserted therein, and the hemispherical outer side 450 of the locking member 400 has a radius of curvature equal to that of the hemispherical recess 331, which allows the locking member 400 to be secured in the receiving slot portion 330 and prevents slippage of the orthopedic bone plate 300. The receiving groove part 330 includes an installation groove group and a hemispherical concave groove 331 respectively communicated with both ends of the installation groove group in the length direction; the set of mounting slots includes a plurality of arcuate recesses 332 connected in series along the length of the first plate receiving surface 310, which configuration enables the corrective bone plate 300 to be used for corrective procedures for vertebral bodies 10 of varying spacing. The corrective bone plate 300 is a symmetrical structure with the first medial plane as the medial plane, which enables the locking member 400 to be stably secured in the receiving groove portion 330 and facilitates installation of the locking member 400. The two connectors 120 are abutted against the receiving groove 340 of the second board receiving surface 320, so that the positions of the connectors 120 are stable. In the installed spinal correction fixation system, the locking member 400 is fastened in the hemispherical recess 331 of the receiving groove portion 330 or the locking member 400 is fastened in the arc-shaped recess 332 of the receiving groove portion 330. In this embodiment, in the installed spinal correction fixation system, two locking members 400 are fastened in two hemispherical concave grooves 331 of the receiving groove portion 330.
The hemispherical outer side 450 of locking member 400 has a radius of curvature equal to the radius of curvature of hemispherical depression 331, which facilitates positioning of bone plate 300 by medical personnel during surgery.
Compared with the conventional straight screw, the offset screw has better withdrawal resistance and better compression correction capability on the vertebral body 10, and is not easy to break.
The spinal column correction fixing system is simple in structure, rapid and convenient to install, brings convenience to operation of doctors, greatly shortens operation time, and is safe and reliable in structure and good in overall stability after being locked.
The plane having the same distance between the first plate receiving surface 310 and the second plate receiving surface 320 is a second middle plane, and the orthopedic bone plate 300 has a symmetrical structure with the second middle plane as a central axis plane. I.e., the distance between the second medial plane and the first panel receiving surface 310 is equal to the distance between the second medial plane and the second panel receiving surface 320. The first board receiving surface 310 is parallel to the second board receiving surface 320, and the first board receiving surface 310 is parallel to the second middle plane. This configuration allows the receiving slot portion 340 to have the same configuration as the receiving slot portion 330, which facilitates the manufacturing of the bone plate 300, and allows the medical staff to use the bone plate without distinguishing the first plate receiving surface 310 from the second plate receiving surface 320.
To facilitate the installation of the connection head 120, the radius of curvature of the hemispherical concave groove 331 is equal to the radius of curvature of the hemispherical surface 121.
Spinal corrective fixation system, further comprising: two auxiliary extensions 200, each auxiliary extension 200 comprising a connection tube 210 and an extension tube 220, the extension tube 220 being detachably connected to the corresponding offset head column 130 through the connection tube 210. The associated auxiliary extension 200 and offset head post 130 pass through the locking member 400. The auxiliary extensions 200 correspond to the setscrew one to one. 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 central axis L1 of the offset column 130 of the two offset screws is perpendicular to the axial direction of the implanted vertebral body 10, the axial direction of the vertebral body 10 is the direction of the central axis L2 of the vertebral body 10, and the end of the offset column 130 far away from the connector 120 faces outward; the offset head column 130 of each offset head screw is connected with the extension pipe 220 through the connecting pipe 210; the corrective bone plate 300 is placed over the two extension tubes 220 and the corrective bone plate 300 is moved downward so that the corrective bone plate 300 moves to the junction of the connector 120 and the offset head post 130. When the locking members 400 are installed, the extension pipes 220 are inserted into the corresponding locking members 400.
The main nail rod 110 is provided with a nail body external thread, the nail body external thread comprises a first nail body thread part 111 and a second nail body thread part 112 which are connected, the first nail body thread part 111 is positioned between the second nail body thread part 112 and the connecting head 120, and the thread pitch of the first nail body thread part 111 is smaller than that of the second nail body thread part 112. Compared with the second screw thread portion 112, the pitch of the first screw thread portion 111 is a narrow pitch, the pitch of the second screw thread portion 112 is a wide pitch, the pitch of the second screw thread portion 112 grips cancellous bone inside the vertebral body 10, and the pitch of the first screw thread portion 111 grips cortical bone, which is hard on the surface of the vertebral body 10, so that the entire internal fixation structure is more stable.
The outer side of the mounting tab 420 is hexagonal. The outer side of the mounting tab 420 is hexagonal for easy handling and locking.
The connection pipe 210 includes a main pipe 211 and a mounting pipe 212 connected to the main pipe 211; the mounting pipe 212 is provided with a pipe external thread 213; the offset column 130 is provided with an offset internal thread 132, and the pipe external thread 213 is connected with the offset internal thread 132. The mounting tube 212 can be removably coupled to the offset head post 130.
The main pipe member 211 includes a middle pipe portion 2111 and a receiving pipe portion 2112, both ends of the middle pipe portion 2111 are connected to the receiving pipe portion 2112 and the installation pipe member 212, respectively, the outer diameter of the receiving pipe portion 2112 is smaller than the outer diameter of the middle pipe portion 2111, and the outer diameter of the installation pipe member 212 is smaller than the outer diameter of the middle pipe portion 2111; the extension pipe 220 is fitted over the receiving pipe portion 2112. The main tube member 211 is structured to facilitate abutment of the extension tube 220 against the intermediate tube portion 2111.
The spinal correction fixation system further includes a reinforcing rod 500 for penetrating into the extension tube 220. When the reinforcing rod 500 is operated, the reinforcing rod 500 penetrates along the extension pipe 220, one end of the reinforcing rod 500 is a tip 510, the tip 510 of the reinforcing rod 500 penetrates into the inner hole of the connecting pipe 210, the tip 510 of the reinforcing rod 500 abuts against the connecting pipe 210, a protruding portion 520 is arranged on the outer side face of the other end of the reinforcing rod 500, and an anti-skidding groove is formed in the protruding portion 520, so that a doctor can conveniently hold the reinforcing rod in an operation.
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; in the implantation process, the two offset head screws are adjusted clockwise or anticlockwise, so that the central axes L1 of the offset head columns 130 of the two offset head screws are perpendicular to the axial direction of the implanted vertebral body 10, and one ends of the offset head columns 130, which are far away from the connecting head 120, face outwards;
2) The offset head column 130 of each offset head screw is connected with the extension pipe 220 through the connecting pipe 210; if necessary, the reinforcing rod 500 can be inserted along the inner hole of the extension tube 220 after the eccentric screw is implanted, and the reinforcing rod 500 is pressed against the connecting tube 210; the extension pipe 220 and the reinforcing rod 500 play a role in guiding, so that the next operation is facilitated;
3) Pulling corrective bone plate 300 over the two extension tubes 220, and moving corrective bone plate 300 downward such that corrective bone plate 300 moves to the junction of connector 120 and offset head post 130;
4) Inserting the connecting head 120 of the offset screw implanted in the unbent vertebral body 10 into the receiving groove 340 on the second plate receiving surface 320 of the correcting bone plate 300, inserting the offset column 130 of the offset screw implanted in the unbent vertebral body 10 into the receiving groove 330, inserting one of the extension tubes 220 into one of the locking members 400, wherein the mounting internal thread 440 of one of the locking members 400 is connected with the offset external thread 1313 of the offset column 130 of the offset screw implanted in the unbent vertebral body 10, and one of the locking members 400 abuts against the receiving groove 330 of the correcting bone plate 300;
5) Adjusting the laterally curved vertebral body 10 to achieve a corrected position of the laterally curved vertebral body 10;
6) Inserting another extension tube 220 into another locking member 400, wherein the internal mounting thread 440 of the other locking member 400 is connected to the external offset thread 131 of the offset post 130 of the offset screw implanted in the corrected vertebral body 10, and the central axes L1 of the offset posts 130 of the two offset screws are parallel to each other, and the central axes L1 of the offset posts 130 of the offset screws implanted in the corrected vertebral body 10 are perpendicular to the first plate receiving surface 310 of the correction bone plate 300; after the two vertebral bodies 10 are adjusted, the parts of the offset columns 130 of the two offset screws, which are positioned at the upper parts of the locking components 400, are cut off, the parts of the offset columns 130 of the two offset screws, which are positioned at the upper parts of the locking components 400, are taken out, and the correction and the fixation are finished.
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.
Claims (5)
1. A spinal correction fixation system, comprising: a corrective bone plate (300), two locking members (400), and two lag screws; the lag screw includes: 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); a truncation groove (135) is formed in the outer peripheral surface of the offset head threaded rod (134) along the circumferential direction of the offset head threaded rod (134);
the correcting bone plate (300) is in a long strip-shaped structure, and the correcting bone plate (300) is provided with a first plate bearing surface (310) and a second plate bearing surface (320) which are oppositely and parallelly arranged; the first plate bearing surface (310) is provided with a bearing groove part (330), and the second plate bearing surface (320) is provided with a containing groove part (340) for placing the hemispherical surface (121) of the connector (120);
each locking component (400) is provided with an installation through hole (430), and the wall of each installation through hole (430) is provided with an installation internal thread (440);
the correcting bone plate (300) is sleeved on the offset-head columns (130) of the two offset-head screws, and the connecting heads (120) of the two offset-head screws are abutted in the receiving groove parts (340) of the second plate bearing surface (320); mounting internal threads (440) of the two locking components (400) are respectively connected with the eccentric head external threads (131) of the corresponding eccentric head screw, and the two locking components (400) are abutted to the receiving groove part (330);
the bearing groove part (330) comprises an installation groove group and hemispherical concave grooves (331) which are respectively communicated with two ends of the installation groove group in the length direction; the mounting groove group comprises a plurality of arc-shaped concave grooves (332) which are sequentially connected along the length direction of the first plate receiving surface (310), and the curvature radius of each arc-shaped concave groove (332) is equal to that of the hemispherical concave groove (331); a spherical groove round through hole (333) is formed in the bottom surface of each hemispherical concave groove (331); each arc-shaped concave groove (332) is provided with an arc-shaped groove circular through hole (334), and all the arc-shaped groove circular through holes (334) are communicated with each other; the central axes of all the arc-groove circular through holes (334) and the central axes of all the ball-groove circular through holes (333) are positioned on the same plane; the plane of the central axes of all the arc-groove circular through holes (334) is a first middle plane, the first middle plane is parallel to the length direction of the correcting bone plate (300), and the correcting bone plate (300) is in a symmetrical structure with the first middle plane as a central axis plane; the two spherical groove circular through holes (333) are respectively communicated with the adjacent arc groove circular through holes (334);
each locking component (400) comprises a compression joint (410) and a mounting joint (420) which are connected, the side of the compression joint (410) far away from the mounting joint (420) is a hemispherical outer side surface (450), and the curvature radius of the hemispherical outer side surface (450) is equal to that of the hemispherical concave groove (331); the hemispherical outer side surface (450) of the compression joint (410) abuts in the receiving groove portion (330).
2. The spinal correction fixation system of claim 1, wherein: the plane which is equal to the distance between the first plate receiving surface (310) and the second plate receiving surface (320) is a second middle plane, and the correcting bone plate (300) is in a symmetrical structure taking the second middle plane as a central axis plane.
3. The spinal correction fixation system of claim 1, wherein: further comprising:
two auxiliary extensions (200), each auxiliary extension (200) comprising a connecting tube (210) and an extension tube (220), wherein the extension tube (220) is detachably connected with the corresponding offset column (130) through the connecting tube (210).
4. The spinal correction fixation system of claim 3, wherein: the connection pipe (210) includes a main pipe part (211) and a mounting pipe part (212) connected with the main pipe part (211); the mounting pipe fitting (212) is provided with a pipe fitting external thread (213); be equipped with on the inclined to one side first post (130) and incline first internal thread (132), pipe fitting external screw thread (213) with incline first internal thread (132) and be connected.
5. The spinal corrective fixation system of claim 3 wherein: a reinforcing rod (500) is also included for penetrating into the extension pipe (220).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110565151.1A CN113384335B (en) | 2021-05-24 | 2021-05-24 | Eccentric screw and spinal correction fixing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110565151.1A CN113384335B (en) | 2021-05-24 | 2021-05-24 | Eccentric screw and spinal correction fixing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113384335A CN113384335A (en) | 2021-09-14 |
| CN113384335B true CN113384335B (en) | 2023-03-31 |
Family
ID=77618813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110565151.1A Active CN113384335B (en) | 2021-05-24 | 2021-05-24 | Eccentric screw and spinal correction fixing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113384335B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2802796A1 (en) * | 1999-12-24 | 2001-06-29 | Materiel Orthopedique En Abreg | Bolt for connecting vertebra to longitudinal member, e.g. spine |
| WO2003068088A1 (en) * | 2002-02-13 | 2003-08-21 | Cross Medical Products, Inc. | Posterior polyaxial system for the spine |
| CN101166478A (en) * | 2005-04-29 | 2008-04-23 | 华沙整形外科股份有限公司 | Multi-axial anchor assemblies for spinal implants and methods |
| CN102596066A (en) * | 2009-03-26 | 2012-07-18 | 思邦科技脊柱智慧集团股份公司 | Spine fixation system |
| CN102908184A (en) * | 2012-11-16 | 2013-02-06 | 上海三友医疗器械有限公司 | Extension tube and connector, as well as extension tube component and pedicle screw assembly |
| CN104116552A (en) * | 2014-08-04 | 2014-10-29 | 上海三友医疗器械有限公司 | Intervertebral fusion device and installation tool thereof |
| US9192483B1 (en) * | 2014-06-27 | 2015-11-24 | Amendia, Inc. | Spinal fusion system |
| CN106551721A (en) * | 2015-09-30 | 2017-04-05 | 上海三友医疗器械股份有限公司 | Transverse shift nail tail, laterally adjustable section spinal bone screw and method for implantation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10157969C1 (en) * | 2001-11-27 | 2003-02-06 | Biedermann Motech Gmbh | Element used in spinal and accident surgery comprises a shaft joined to a holding element having a U-shaped recess with two free arms having an internal thread with flanks lying at right angles to the central axis of the holding element |
| FR2920959B1 (en) * | 2007-09-17 | 2010-09-10 | Clariance | VERTEBRAL ANCHORING DEVICE. |
-
2021
- 2021-05-24 CN CN202110565151.1A patent/CN113384335B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2802796A1 (en) * | 1999-12-24 | 2001-06-29 | Materiel Orthopedique En Abreg | Bolt for connecting vertebra to longitudinal member, e.g. spine |
| WO2003068088A1 (en) * | 2002-02-13 | 2003-08-21 | Cross Medical Products, Inc. | Posterior polyaxial system for the spine |
| CN101166478A (en) * | 2005-04-29 | 2008-04-23 | 华沙整形外科股份有限公司 | Multi-axial anchor assemblies for spinal implants and methods |
| CN102596066A (en) * | 2009-03-26 | 2012-07-18 | 思邦科技脊柱智慧集团股份公司 | Spine fixation system |
| CN102908184A (en) * | 2012-11-16 | 2013-02-06 | 上海三友医疗器械有限公司 | Extension tube and connector, as well as extension tube component and pedicle screw assembly |
| US9192483B1 (en) * | 2014-06-27 | 2015-11-24 | Amendia, Inc. | Spinal fusion system |
| CN104116552A (en) * | 2014-08-04 | 2014-10-29 | 上海三友医疗器械有限公司 | Intervertebral fusion device and installation tool thereof |
| CN106551721A (en) * | 2015-09-30 | 2017-04-05 | 上海三友医疗器械股份有限公司 | Transverse shift nail tail, laterally adjustable section spinal bone screw and method for implantation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113384335A (en) | 2021-09-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7211087B2 (en) | Multi-planar adjustable connector | |
| US8052726B2 (en) | Ilio-sacral connector system and method | |
| EP2765934B1 (en) | Bone anchor assemblies | |
| KR100745326B1 (en) | Multi-Axial Bone Anchor Apparatus | |
| US8133262B2 (en) | Large diameter bone anchor assembly | |
| US20080004625A1 (en) | Bone anchor assemblies | |
| US8475499B2 (en) | Rod to rod connectors and methods of adjusting the length of a spinal rod construct | |
| US8361129B2 (en) | Large diameter bone anchor assembly | |
| EP1429671B1 (en) | Connection rod for screw or hook polyaxial system | |
| US20080015597A1 (en) | Large diameter bone anchor assembly | |
| US20050203515A1 (en) | Bone anchor assemblies | |
| US8231660B2 (en) | System and method for facet fixation | |
| US20120209327A1 (en) | System and method for facet fixation | |
| AU2002213261A1 (en) | Connector for spinal rod and vertebral anchor | |
| US10307185B2 (en) | Revision connectors, systems, and methods thereof | |
| JP2017205487A (en) | Revision connectors, systems, and methods thereof | |
| AU2001247388A1 (en) | Multi-axial bone anchor system | |
| US11317948B2 (en) | Fusion systems and methods of assembly and use | |
| US9763718B2 (en) | Bone screw | |
| CN113384335B (en) | Eccentric screw and spinal correction fixing system | |
| KR100919429B1 (en) | An assist device for spinal implant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |