CN212661903U - Cervical vertebra and thoracic vertebra double-rod fixed connection device and connection assembly - Google Patents
Cervical vertebra and thoracic vertebra double-rod fixed connection device and connection assembly Download PDFInfo
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- CN212661903U CN212661903U CN202020369616.7U CN202020369616U CN212661903U CN 212661903 U CN212661903 U CN 212661903U CN 202020369616 U CN202020369616 U CN 202020369616U CN 212661903 U CN212661903 U CN 212661903U
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- 210000000115 thoracic cavity Anatomy 0.000 title claims abstract description 53
- 230000009977 dual effect Effects 0.000 claims description 8
- 230000008878 coupling Effects 0.000 abstract description 12
- 238000010168 coupling process Methods 0.000 abstract description 12
- 238000005859 coupling reaction Methods 0.000 abstract description 12
- 238000005452 bending Methods 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 241001079814 Symphyotrichum pilosum Species 0.000 description 5
- 235000004224 Typha angustifolia Nutrition 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 208000024891 symptom Diseases 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 206010002556 Ankylosing Spondylitis Diseases 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 208000019505 Deglutition disease Diseases 0.000 description 1
- 206010023509 Kyphosis Diseases 0.000 description 1
- 208000031264 Nerve root compression Diseases 0.000 description 1
- 206010037779 Radiculopathy Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model provides a two excellent fixed connection of cervical vertebra and thoracic vertebra device and coupling assembling, include: 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 utility model 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 utility model relates to the field of medical equipment, especially relate to a two excellent fixed connection of cervical vertebra and thoracic vertebra device and coupling assembling.
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.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide a cervical and thoracic vertebrae dual-rod fixing and connecting device and connecting assembly, which are used to solve the above problems existing in the prior art.
In order to solve the technical problem, the utility model provides a two excellent fixed connection of cervical vertebra and thoracic vertebra device, include:
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 utility model also relates to a connecting component, which comprises two cervical vertebra and thoracic vertebra double-rod fixed connecting devices, wherein the diameter of a first locking thread part of the first cervical vertebra and thoracic vertebra double-rod fixed connecting device is equal to the diameter of a second locking thread part of the second cervical vertebra and thoracic vertebra double-rod fixed connecting device; the diameter of the second locking thread part of the first cervical and thoracic vertebra double-rod fixed connecting device is equal to that of the first locking thread part of the second cervical and thoracic vertebra double-rod fixed connecting device.
As above, the utility model discloses a two excellent fixed connection of cervical vertebra and thoracic vertebra device and coupling assembling have following beneficial effect:
when the cervical and thoracic vertebra double-rod fixed connecting device of the utility model is used, the screws of the two cervical and thoracic vertebra double-rod fixed connecting devices are respectively arranged on the C6 cervical vertebra and the T1 thoracic vertebra; in the two devices, a first locking thread part of a first cervical and thoracic vertebra double-rod fixed connecting device and a second locking thread part of a second cervical and 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 cervical and thoracic vertebra double-rod fixed connecting device and a second locking thread part of a first cervical and 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 is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to the attached drawings. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the 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 utility model discloses a connecting assembly, which comprises two cervical and thoracic vertebra double-rod fixed connecting devices, wherein the two cervical and thoracic vertebra double-rod fixed connecting devices are respectively a first cervical and thoracic vertebra double-rod fixed connecting device 1 and a second cervical and thoracic vertebra double-rod fixed connecting device 2; the diameter of the first locking thread part 120 of the first cervical and thoracic vertebra double-rod fixed connection device 1 is equal to the diameter of the second locking thread part 420 of the second cervical and thoracic vertebra double-rod fixed connection device 2; the diameter of the second locking thread part 420 of the first cervical and thoracic dual-rod fixed connection device 1 is equal to the diameter of the first locking thread part 120 of the second cervical and thoracic dual-rod fixed connection device 2.
When the cervical and thoracic vertebra double-rod fixed connecting device of the utility model is used, the first cervical and thoracic vertebra double-rod fixed connecting device 1 is arranged on the C6 cervical vertebra 520, and the second cervical and thoracic vertebra double-rod fixed connecting device 2 is arranged on the T1 thoracic vertebra 530; of the two devices, the first locking thread part 120 of the first cervical and thoracic vertebrae double-rod fixed connection device 1 and the second locking thread part 420 of the second cervical and thoracic vertebrae double-rod fixed connection device 2 are used for fixing thin rods; of the two devices, the first locking thread part 120 of the second cervical and thoracic vertebrae double-rod fixed connection device 1 and the second locking thread part 420 of the first cervical and thoracic vertebrae 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 screw portion 120 of the first cervical and thoracic vertebrae dual-rod fixed connection device 1 is smaller than that of the second locking screw portion 420; the diameter of the first locking screw portion 120 of the second cervical and thoracic dual rod fixed connection device 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 utility model discloses a connecting device assembling method is used for assembling the two excellent fixed connection device of cervical vertebra and thoracic vertebra, nail seat 100 and connecting seat 400 rotate relatively for the axis of first locking screw thread portion 120 and the axis of second locking screw thread portion 420 are 90, insert the spacing groove 430 of connecting seat 400 with the annular protruding piece 210 of side direction pole 200, when annular protruding piece 210 stretches into spherical receiving portion 440, will connecting seat 400 is rotatory 90, makes the last protruding portion 211 of annular protruding piece 210 sets up, and at this moment, the axis of first locking screw thread portion 120 is parallel with the axis of second locking screw thread portion 420, later, will the inside punching press of bottom surface of connecting seat 400 forms spacing arch 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.
To sum up, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may 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 (6)
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: comprising two double-rod fixed connection devices according to any of claims 1 to 5, the diameter of the first locking thread (120) of the first double-rod fixed connection device (1) being equal to the diameter of the second locking thread (420) of the second double-rod fixed connection device (2); the diameter of the second locking thread part (420) of the first cervical and thoracic vertebra double-rod fixed connecting device (1) is equal to the diameter of the first locking thread part (120) of the second cervical and thoracic vertebra double-rod fixed connecting device (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020369616.7U CN212661903U (en) | 2020-03-20 | 2020-03-20 | Cervical vertebra and thoracic vertebra double-rod fixed connection device and connection assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020369616.7U CN212661903U (en) | 2020-03-20 | 2020-03-20 | Cervical vertebra and thoracic vertebra double-rod fixed connection device and connection assembly |
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| Publication Number | Publication Date |
|---|---|
| CN212661903U true CN212661903U (en) | 2021-03-09 |
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| CN202020369616.7U Active CN212661903U (en) | 2020-03-20 | 2020-03-20 | Cervical vertebra and thoracic vertebra double-rod fixed connection device and connection assembly |
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| CN (1) | CN212661903U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113143427A (en) * | 2020-03-20 | 2021-07-23 | 首都医科大学附属北京天坛医院 | Cervical and thoracic vertebra double-rod fixed connecting device, connecting assembly and connecting device assembling method |
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2020
- 2020-03-20 CN CN202020369616.7U patent/CN212661903U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113143427A (en) * | 2020-03-20 | 2021-07-23 | 首都医科大学附属北京天坛医院 | Cervical and thoracic vertebra double-rod fixed connecting device, connecting assembly and connecting device assembling method |
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| GR01 | Patent grant |