CN113143427A - Cervical and thoracic vertebra double-rod fixed connecting device, connecting assembly and connecting device assembling method - Google Patents
Cervical and thoracic vertebra double-rod fixed connecting device, connecting assembly and connecting device assembling method Download PDFInfo
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- CN113143427A CN113143427A CN202010202688.7A CN202010202688A CN113143427A CN 113143427 A CN113143427 A CN 113143427A CN 202010202688 A CN202010202688 A CN 202010202688A CN 113143427 A CN113143427 A CN 113143427A
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- outer side
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- rod fixed
- groove
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- 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
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
-
- 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
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- 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
- A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
- A61B17/7083—Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
-
- 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
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
- A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
- A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
-
- 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
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
Abstract
The invention provides a cervical and thoracic vertebra double-rod fixed connecting device, a connecting assembly and a connecting device assembling method, which comprises the following steps: the nail seat is provided with a first bar groove at the top, and a first locking thread part is arranged on the inner side surface of the first bar groove; a ball socket is arranged inside the nail seat; the outer side surface of the nail seat is provided with a lateral rod, and an annular bulge piece is arranged along the circumferential direction of the outer side surface of the lateral rod; the screw comprises a screw rod and a ball head, and the ball head is arranged in the ball socket; the top of the connecting seat is provided with a second bar groove, and the inner side surface of the second bar groove is provided with a second locking thread part; a limiting groove is formed in the outer side face of the connecting seat, a spherical accommodating part is arranged in the limiting groove, the spherical accommodating part is used for accommodating the annular convex piece, and the annular convex piece can rotate in the spherical accommodating part; the bottom of the spherical containing part is provided with a limiting bulge. The invention enhances the stability of the internal fixing system; can reduce the times of bending the rod and the degree of bending the rod, effectively save the operation time and reduce the change of the internal stress caused by the bending the rod.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a cervical and thoracic vertebra double-rod fixed connecting device, a connecting assembly and a connecting device assembling method.
Background
Kyphosis caused by ankylosing spondylitis often leads to severe visual field restriction, dysphagia and nerve root compression symptoms in patients. In order to restore the balance between cervical vertebra deformity and coronal position and relieve clinical symptoms of patients, the posterior cervical osteotomy can be performed when the cervical osteotomy orthopedic surgery is satisfied. The common internal fixation in the operation adopts a nail-rod system, and because the thin rod or the rod part for fixing the cervical vertebra part is thinner, and the thick rod or the rod part for fixing the thoracic vertebra part is thicker; the existing nail rod system generally comprises two connecting rods and screws for fixing the two connecting rods, wherein the two connecting rods are respectively arranged on the left side and the right side of a vertebral column, and the two connecting rods are connected through a cross beam. The existing connecting rods are generally of two types, the first connecting rod comprises two rods with different diameters which are sequentially connected, the two rods are fixedly connected together through a connecting device, and the connecting position of the two rods is positioned at the junction of cervical vertebra and thoracic vertebra; the second connecting rod is a rod body with variable diameter, and the diameter transition section of the second rod body is at the junction section of cervical vertebra and thoracic vertebra. The internal fixation rod bears the largest stress load at the C7 osteotomy level, and is more easy to break relative to other positions, and the internal fixation structure adopting the two existing nail rod systems is limited to the physiological structure characteristics of a human body, and the thick and thin transition sections of the rod are at the C7 osteotomy level, so that the internal fixation failure is more easy to occur.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a cervico-thoracic dual-rod fixation connection device, a connection assembly and a connection device assembly method, which solve the above-mentioned problems in the prior art.
In order to solve the above technical problems, the present invention provides a cervical and thoracic vertebrae dual-rod fixed connection device, comprising:
the nail seat is provided with a first bar groove at the top, the first bar groove is downwards sunken from the top of the nail seat and radially penetrates through the nail seat, and a first locking thread part is arranged on the inner side surface of the first bar groove; a ball socket is arranged in the nail seat and is positioned below the first bar groove; a lateral rod is arranged on the outer side surface of the nail seat, and a plane where a central axis of the lateral rod and a central axis of the first locking thread part are located is a vertical middle plane; an annular bulge piece is arranged along the circumferential direction of the outer side face of the lateral rod, the outer side face of the annular bulge piece is spherical, a first lateral cutting face and a second lateral cutting face which are opposite to each other are arranged on the outer side face of the annular bulge piece, and the first lateral cutting face and the second lateral cutting face are symmetrically arranged by taking the vertical middle plane as a middle axial plane; a lower cutting surface is further arranged on the outer side surface of the annular protruding piece and is perpendicular to the vertical middle plane;
the screw comprises a screw rod and a ball head arranged at the head of the screw rod, and the ball head is arranged in the ball socket;
the top of the connecting seat is provided with a second bar groove, the second bar groove is downwards sunken from the top of the connecting seat and radially penetrates through the connecting seat, and the inner side surface of the second bar groove is provided with a second locking thread part; a limiting groove for the annular protruding piece to be inserted is formed in the outer side face of the connecting seat, a spherical receiving portion communicated with the second rod groove is formed in the limiting groove, and the spherical receiving portion is used for the annular protruding piece to be placed in; the bottom of the spherical containing part is provided with a limiting bulge.
Preferably, the structure of the cross section of the limiting groove corresponds to the structure of the outer side face of the annular bulge piece; the upper surface of the limiting groove corresponds to a first lateral cutting surface of the annular protrusion piece, and the lower surface of the limiting groove corresponds to a second lateral cutting surface of the annular protrusion piece.
Preferably, the outer side surface of the annular protrusion is further provided with two opposite end cutting surfaces, and each end cutting surface is perpendicular to the central axis of the lateral rod.
Preferably, a diameter of the first locking screw part is not equal to a diameter of the second locking screw part.
Preferably, the bottom of the nail seat is provided with a concave track.
The invention also relates to a connecting assembly, which comprises two thoracic vertebra double-rod fixed connecting devices, wherein the diameter of a first locking thread part of the first thoracic vertebra double-rod fixed connecting device is equal to the diameter of a second locking thread part of the second thoracic vertebra double-rod fixed connecting device; the diameter of the second locking thread part of the first thoracic vertebra double-rod fixed connecting device is equal to that of the first locking thread part of the second thoracic vertebra double-rod fixed connecting device.
The invention also relates to a connecting device assembling method, which is used for assembling the neck-thoracic vertebra double-rod fixed connecting device, the annular bulge piece is inserted into the limiting groove of the connecting seat, when the annular bulge piece extends into the spherical receiving part, the connecting seat is rotated by 90 degrees, the upper bulge part of the annular bulge piece is upwards arranged, and the bottom surface of the connecting seat is inwards punched to form the limiting bulge.
As mentioned above, the neck and thoracic vertebra double-rod fixed connecting device, the connecting component and the connecting device assembling method have the following beneficial effects:
when the cervical and thoracic vertebra double-rod fixed connecting device is used, screws of the two cervical and thoracic vertebra double-rod fixed connecting devices are respectively arranged on a C6 cervical vertebra and a T1 thoracic vertebra; in the two devices, a first locking thread part of a first thoracic vertebra double-rod fixed connecting device and a second locking thread part of a second thoracic vertebra double-rod fixed connecting device are used for fixing thin rods; in the two devices, a first locking thread part of a second thoracic vertebra double-rod fixed connecting device and a second locking thread part of a first thoracic vertebra double-rod fixed connecting device are used for fixing thick rods; the internal fixing system formed by the thin rod, the thick rod and the two devices realizes double-rod connection and fixation at the C7 osteotomy section with the largest bearing stress, so that the stability of the internal fixing system is enhanced; in addition, because the annular protruding piece on the side direction pole can rotate in the spherical storage part of connecting seat, the bulb of screw can rotate in the ball socket of nail seat, so, interior fixing system can carry out many planes and adjust, then can reduce the degree of curved bar number of times and curved bar, effectively saves the operation time and reduces the internal stress change that the curved bar brought.
Drawings
Fig. 1 is a perspective view of the assembled first cervico-thoracic dual-rod fastening and connecting device of this embodiment.
Fig. 2 is a perspective view of the first embodiment of the dual rod cervical and thoracic fixation connection device showing the insertion of the lateral rods into the slots.
FIG. 3 is a schematic top view of the first exemplary embodiment of a cervico-thoracic dual-rod fastening system.
Fig. 4 is a schematic sectional view taken along line a-a of fig. 3.
Fig. 5 is a schematic view of the cross-sectional structure along the direction B-B in fig. 3.
Fig. 6 is a schematic structural view of the rotation angle interval of the connecting seat of the first cervico-thoracic vertebra dual-rod fixed connection device relative to the nail seat in the embodiment.
FIG. 7 is a side view of the first embodiment of the dual rod cervical and thoracic anchor attachment shown in a side view after attachment of the staple holder to the lateral rod.
Fig. 8 is a schematic view of the cross-sectional structure along the direction D-D in fig. 7.
FIG. 9 is a perspective view of the first embodiment of the bottom of the first device for connecting a cervical and thoracic vertebrae to a lateral rod.
Fig. 10 is a schematic view showing the structure of a screw of the first cervical and thoracic dual-rod fixed connection device of this embodiment.
Fig. 11 is a schematic structural view of the connection seat of the first cervico-thoracic vertebra dual-rod fixed connection device of the present embodiment.
FIG. 12 is a schematic view of the cross-sectional structure of FIG. 11 taken along the line E-E.
FIG. 13 is a perspective view of the second exemplary embodiment of a cervical and thoracic dual rod fixation connector assembly after assembly.
Fig. 14 is a schematic structural view of the connecting member of the present embodiment in use.
Description of the reference numerals
1 first cervical and thoracic vertebrae double-rod fixed connection device
2 second cervical and thoracic vertebrae double-rod fixed connection device
100 nail seat
110 first bar groove
120 first locking screw part
130 ball socket
140 concave track
200 side rod
210 annular projection
211 outer side of annular projection
212 first lateral cut surface
213 lower cut surface
214 second lateral cutting face
215 end cutting surface
300 screw
310 nail rod
320 ball head
400 connecting seat
410 second bar groove
420 second locking screw part
430 spacing groove
440 spherical receiving portion
450 limiting bulge
510C 7 osteotomy segment
520C 6 cervical vertebra
530T 1 thoracic vertebra
610 thick rod
620 thin rod
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 14, the cervical and thoracic vertebrae dual-rod fixed connection device of the present embodiment includes:
the nail holder 100, the top of the nail holder 100 is provided with a first bar groove 110, the first bar groove 110 is recessed downwards from the top of the nail holder 100 and radially penetrates through the nail holder 100, and the inner side surface of the first bar groove 110 is provided with a first locking thread part 120; a ball socket 130 is arranged inside the nail seat 100, and the ball socket 130 is positioned below the first bar groove 110; a lateral rod 200 is arranged on the outer side surface of the nail seat 100, and a plane where a central axis of the lateral rod 200 and a central axis of the first locking thread part 120 are located is a vertical middle plane; an annular convex part 210 is arranged along the circumferential direction of the outer side surface of the lateral rod 200, the outer side surface of the annular convex part 210 is spherical, a first lateral cutting surface 212 and a second lateral cutting surface 214 which are opposite to each other are arranged on the outer side surface 211 of the annular convex part 210, and the first lateral cutting surface 212 and the second lateral cutting surface 214 are symmetrically arranged by taking the vertical middle plane as a middle axis; a lower cutting surface 213 is further arranged on the outer side surface 211 of the annular convex part 210, and the lower cutting surface 213 is perpendicular to the vertical middle plane;
the screw 300, the said screw 300 includes the nail pole 310 and ball head 320 set in the head of the said nail pole 310, the said ball head 320 is put into the said ball socket 130;
the connecting seat 400, a second rod groove 410 is formed at the top of the connecting seat 400, the second rod groove 410 is recessed downwards from the top of the connecting seat 400 and radially penetrates through the connecting seat 400, and a second locking screw part 420 is formed on the inner side surface of the second rod groove 410; a limiting groove 430 for the annular protrusion 210 to be inserted into is formed on the outer side surface of the connecting seat 400, a spherical receiving portion 440 communicated with the second rod groove 410 is formed in the limiting groove 430, the spherical receiving portion 440 is used for the annular protrusion 210 to be inserted into, and the annular protrusion 210 can rotate in the spherical receiving portion 440; the bottom of the spherical receiving part 440 is provided with a limiting protrusion 450.
The connecting assembly comprises two thoracic vertebra double-rod fixed connecting devices, wherein the two thoracic vertebra double-rod fixed connecting devices are a first thoracic vertebra double-rod fixed connecting device 1 and a second thoracic vertebra double-rod fixed connecting device 2 respectively; the diameter of the first locking thread part 120 of the first thoracic double-rod fixed connection device 1 is equal to the diameter of the second locking thread part 420 of the second thoracic double-rod fixed connection device 2; the diameter of the second locking thread part 420 of the first thoracic double-rod fixed connection device 1 is equal to the diameter of the first locking thread part 120 of the second thoracic double-rod fixed connection device 2.
When the cervical and thoracic vertebra double-rod fixed connecting device is used, the first thoracic vertebra double-rod fixed connecting device 1 is arranged on the C6 cervical vertebra 520, and the second thoracic vertebra double-rod fixed connecting device 2 is arranged on the T1 thoracic vertebra 530; in the two devices, the first locking thread part 120 of the first thoracic vertebra double-rod fixed connecting device 1 and the second locking thread part 420 of the second thoracic vertebra double-rod fixed connecting device 2 are used for fixing thin rods; of the two devices, the first locking thread part 120 of the second thoracic vertebra double-rod fixed connection device 1 and the second locking thread part 420 of the first thoracic vertebra double-rod fixed connection device 1 are used for fixing thick rods; the thin rod 620, the thick rod 610 and the internal fixation system formed by the two devices realize double-rod connection fixation at the C7 osteotomy segment 510 with the highest stress, that is, the thick rod 610 and the thin rod 620 pass through the C7 osteotomy segment 510, but the ends of the thick rod 610 and the thin rod 620 are not on the C7 osteotomy segment 510, and the thick rod 610 and the thin rod 620 are overlapped at the C7 osteotomy segment 510, so that the stability of the internal fixation system can be enhanced;
in addition, since the annular protrusion 210 of the lateral rod 200 can rotate in the spherical receiving portion 440 of the connection seat 400 and the ball 320 of the screw 300 can rotate in the ball socket 130 of the nail seat 100, the internal fixation system can perform multi-plane adjustment, so that the number of times of bending the thin rod 620 and the thick rod 610 can be reduced, the degree of bending the thin rod 620 and the thick rod 610 can be reduced, the operation time can be effectively saved, and the change of internal stress caused by bending the thin rod 620 and the thick rod 610 can be reduced.
In this embodiment, the two sets of connecting assemblies are positioned on the left and right sides of the spinal midline, and the connecting assemblies on the left side of the spinal midline connect thin rods 620 closer to the left edge of the spine than the corresponding thick rods 610. The connection assembly on the right side of the spinal midline connects the slim rod 620 closer to the right side edge of the spine than the corresponding thick rod 610.
After the device is assembled, the central axis of the first locking thread part 120 is parallel to the central axis of the second locking thread part 420, and the bottom cutting surface 213 of the annular bulge part 210 is arranged downwards, so that the connecting seat 400 and the nail seat 100 can rotate around the axial direction of the lateral rod 200; when the connecting seat 400 and the nail seat 100 relatively rotate to a first limit position, the limit bulge 450 of the connecting seat 400 is contacted with the bottom cutting surface 213, and the connecting seat 400 stops rotating; when the relative rotation between the connecting holder 400 and the nail holder 100 reaches the second limit position, the limit projection 450 of the connecting holder 400 contacts the bottom cut surface 213, and the connecting holder 400 stops rotating. In this embodiment, the relative rotation between the connecting seat 400 and the nail seat 100 to the first limit position is the counterclockwise rotation of the connecting seat 400 relative to the nail seat 100, and the relative rotation between the connecting seat 400 and the nail seat 100 to the second limit position is the clockwise rotation of the connecting seat 400 relative to the nail seat 100; when the connecting seat 400 rotates to the first limit position, an included angle between the central axis of the second locking screw part 420 of the connecting seat 400 and the central axis of the first locking screw part 120 is an angle M; when the connecting seat 400 rotates to the second limit position, an included angle between the central axis of the second locking screw part 420 of the connecting seat 400 and the central axis of the first locking screw part 120 is an angle N; the sum of the angle M and the angle N is the rotation angle interval L of the connection seat 400 relative to the nail seat 100. In fig. 6, the relative rotation between coupling holder 400 and nail holder 100 to the first extreme position is the relative position between coupling holder 400 and nail holder 100 shown in solid lines; the relative rotation between coupling socket 400 and nail holder 100 to the second extreme position is the relative position between coupling socket 400 and nail holder 100 shown in phantom.
The structure of the cross section of the limiting groove 430 corresponds to the structure of the outer side surface of the annular convex part 210; the upper surface of the limiting groove 430 corresponds to the first lateral cutting surface 212 of the annular protruding member 210, and the lower surface of the limiting groove 430 corresponds to the second lateral cutting surface 214 of the annular protruding member 210. This structure makes the annular protrusion 210 insert into the spacing groove 430 of the connecting seat 400, and when the annular protrusion 210 extends into the spherical receiving portion 440, after rotating 90 °, the central axes of the first locking thread portion 120 and the second locking thread portion 420 are parallel, and the bottom cutting surface 213 of the annular protrusion 210 is disposed downward, so that the situation that the annular protrusion 210 is separated from the spacing groove 430 due to misoperation is not easy to occur. In addition, when the central axes of the first locking screw part 120 and the second locking screw part 420 are parallel, the coupling socket 400 can also rotate about its own axis, and when the coupling socket 400 rotates to the extreme position, the annular protrusion member 210 blocks the coupling socket 400 from rotating. The sum of the angles at which the coupling socket 400 rotates about its own axis in two opposite directions is a rotation angle interval F at which the coupling socket 400 rotates.
Two opposite end cutting surfaces 215 are also provided on the outer side of the annular protrusion 210, and each of the end cutting surfaces 215 is perpendicular to the central axis of the lateral rod 200. The provision of the end cutting surface 215 effectively avoids interference of the annular protrusion 210 during rotation in the spherical receiving portion 440.
The diameter of the first locking screw part 120 is not equal to the diameter of the second locking screw part 420. The structure is convenient for installation and processing. In this embodiment, the diameter of the first locking thread part 120 of the first thoracic double-rod fixed connection device 1 is smaller than that of the second locking thread part 420; the diameter of the first locking screw portion 120 of the second thoracic double rod fixed link 2 is larger than that of the second locking screw portion 420.
The bottom of the nail seat 100 is provided with a concave track 140, and the concave track 140 is used for the nail rod 310 to move in the concave track, so that the screw 300 can rotate conveniently.
The method for assembling the connecting device of the invention is used for assembling the neck-thoracic vertebra double-rod fixed connecting device, the nail seat 100 and the connecting seat 400 rotate relatively, so that the central axis of the first locking thread part 120 and the central axis of the second locking thread part 420 form 90 degrees, the annular bulge piece 210 of the lateral rod 200 is inserted into the limiting groove 430 of the connecting seat 400, when the annular bulge piece 210 extends into the spherical receiving part 440, the connecting seat 400 rotates 90 degrees, so that the upper bulge part 211 of the annular bulge piece 210 is arranged upwards, at this time, the central axis of the first locking thread part 120 is parallel to the central axis of the second locking thread part 420, and then, the bottom surface of the connecting seat 400 is punched inwards to form the limiting bulge 450.
After the device is assembled, the nail seat 100 and the connecting seat 400 can rotate relatively around the axis of the lateral rod 200, when the limiting protrusion 450 contacts with the lower surface of the lower protrusion 213, the nail seat 100 and the connecting seat 400 stop rotating relatively, the relative rotation range of the nail seat 100 and the connecting seat 400 is the rotation angle interval L of the connecting seat 400 relative to the nail seat 100, and in the rotation angle interval, the nail seat 100 and the connecting seat 400 cannot be separated from each other due to the interaction of the outer side surface 211 of the annular protrusion 210 and the ball socket 130, the lateral rod 200 and the limiting groove 430.
After the device is assembled, the connecting base 400 can also rotate around its central axis within the rotation angle interval F of the rotation of the connecting base 400.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
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 (7)
1. The utility model provides a two excellent fixed connection of cervical vertebra and thoracic vertebra which characterized in that includes:
the nail seat (100), the top of the nail seat (100) is provided with a first bar groove (110), the first bar groove (110) is downwards sunken from the top of the nail seat (100) and radially penetrates through the nail seat (100), and the inner side surface of the first bar groove (110) is provided with a first locking thread part (120); a ball socket (130) is arranged inside the nail seat (100), and the ball socket (130) is positioned below the first bar groove (110); a lateral rod (200) is arranged on the outer side surface of the nail seat (100), and a plane where a central axis of the lateral rod (200) and a central axis of the first locking thread part (120) are located is a vertical middle plane; an annular bulge piece (210) is arranged along the circumferential direction of the outer side face of the lateral rod (200), the outer side face of the annular bulge piece (210) is spherical, a first lateral cutting face (212) and a second lateral cutting face (214) which are opposite to each other are arranged on the outer side face (211) of the annular bulge piece (210), and the first lateral cutting face (212) and the second lateral cutting face (214) are symmetrically arranged by taking the vertical middle plane as a middle axial plane; a lower cutting surface (213) is further arranged on the outer side surface (211) of the annular protruding piece (210), and the lower cutting surface (213) is perpendicular to the vertical middle plane;
the screw (300) comprises a screw rod (310) and a ball head (320) arranged at the head of the screw rod (310), and the ball head (320) is arranged in the ball socket (130);
the connecting seat (400), the top of the connecting seat (400) is provided with a second rod groove (410), the second rod groove (410) is recessed downwards from the top of the connecting seat (400) and penetrates through the connecting seat (400) along the radial direction, and the inner side surface of the second rod groove (410) is provided with a second locking threaded part (420); a limiting groove (430) for the annular protruding piece (210) to be inserted into is arranged on the outer side face of the connecting seat (400), a spherical receiving part (440) communicated with the second rod groove (410) is arranged in the limiting groove (430), and the spherical receiving part (440) is used for the annular protruding piece (210) to be placed in; the bottom of the spherical receiving part (440) is provided with a limiting bulge (450).
2. The dual rod fixed connection device of claim 1, wherein: the structure of the cross section of the limiting groove (430) corresponds to the structure of the outer side face of the annular bulge piece (210); the upper surface of the limiting groove (430) corresponds to the first lateral cutting surface (212) of the annular protruding piece (210), and the lower surface of the limiting groove (430) corresponds to the second lateral cutting surface (214) of the annular protruding piece (210).
3. The dual rod fixed connection device of claim 1, wherein: two opposite end cutting surfaces (215) are further arranged on the outer side surface of the annular protruding piece (210), and each end cutting surface (215) is perpendicular to the central axis of the lateral rod (200).
4. The dual rod fixed connection device of claim 1, wherein: the diameter of the first locking screw part (120) is not equal to the diameter of the second locking screw part (420).
5. The dual rod fixed connection device of claim 1, wherein: the bottom of the nail seat (100) is provided with a sunken track (140).
6. A connection assembly, characterized by: comprises two thoracic double-rod fixed connection devices according to claims 1-5, the diameter of the first locking thread (120) of the first thoracic double-rod fixed connection device (1) being equal to the diameter of the second locking thread (420) of the second thoracic double-rod fixed connection device (2); the diameter of the second locking thread part (420) of the first thoracic vertebra double-rod fixed connecting device (1) is equal to the diameter of the first locking thread part (120) of the second thoracic vertebra double-rod fixed connecting device (2).
7. A method of assembling a connector assembly for assembling the cervico-thoracic dual rod fixation connector of claim 2, wherein:
inserting the annular protruding piece (210) into a limiting groove (430) of the connecting seat (400), rotating the connecting seat (400) by 90 degrees when the annular protruding piece (210) extends into the spherical receiving part (440), enabling the upper protruding part (211) of the annular protruding piece (210) to be arranged upwards, and stamping the bottom surface of the connecting seat (400) inwards to form a limiting protrusion (450).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010202688.7A CN113143427A (en) | 2020-03-20 | 2020-03-20 | Cervical and thoracic vertebra double-rod fixed connecting device, connecting assembly and connecting device assembling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010202688.7A CN113143427A (en) | 2020-03-20 | 2020-03-20 | Cervical and thoracic vertebra double-rod fixed connecting device, connecting assembly and connecting device assembling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113143427A true CN113143427A (en) | 2021-07-23 |
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|---|---|---|---|
| CN202010202688.7A Pending CN113143427A (en) | 2020-03-20 | 2020-03-20 | Cervical and thoracic vertebra double-rod fixed connecting device, connecting assembly and connecting device assembling method |
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| Country | Link |
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| CN (1) | CN113143427A (en) |
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