CN108498155B - Self-locking anti-rotation pedicle screw and use method thereof - Google Patents
Self-locking anti-rotation pedicle screw and use method thereof Download PDFInfo
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- CN108498155B CN108498155B CN201810385391.1A CN201810385391A CN108498155B CN 108498155 B CN108498155 B CN 108498155B CN 201810385391 A CN201810385391 A CN 201810385391A CN 108498155 B CN108498155 B CN 108498155B
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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
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
- A61B17/7034—Screws or hooks with U-shaped head or back through which longitudinal rods pass characterised by a lateral opening
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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
- A61B17/84—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
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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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
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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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention belongs to the technical field of medical equipment, and particularly relates to a self-locking anti-rotation pedicle screw and a use method thereof. The axial anti-extraction device has the advantages of remarkably improving the stability of the fixation of the pedicle screw, improving the axial anti-extraction force of the pedicle screw, ensuring that the screw is not easy to loosen and withdraw, and having low incidence of broken nails and broken rods.
Description
Technical Field
The invention belongs to the technical field of medical equipment, and particularly relates to a self-locking anti-rotation pedicle screw and a using method thereof.
Background
Osteoporosis (OP) is a systemic, metabolic skeletal system disease characterized by low bone mass, broken bone microstructure, increased bone fragility, decreased bone strength, and susceptibility to fracture. The OP prevalence of women over 50 years old in us in 2004 is 13% -18%, 3% -6%, and the prevalence of women over 50 years old in europe in 2010 is 21%, 6%. At the end of 2014, the total prevalence rate of OPs over 50 years old in China is 20.7% for females and 14.4% for males. 57.6% of men and 64.6% of women with low bone mass above 50 years old. OP characteristics: (1) the fracture risk is obviously increased, (2) the internal fixation is easy to loosen, deviate from or break the nail and the rod, (3) the fracture healing time is long or does not heal, (4) the bone grafting is easy to absorb, (5) the activity is reduced, the bone absorption is accelerated, the OP is aggravated, (6) the reduction is difficult after the fracture part, and the fracture risk is high again. Literature reports that the failure rate of fixation in OP is as high as 18% -63%.
The death rate of the conservative treatment of the osteoporosis vertebral fracture is increased by 23 percent, and the surgical treatment comprises the following steps: (1) and (3) fixing by common screws: the diameter and the length of the implanted screw are increased, the fixed section is increased, the wound is large, the operation risk is increased, the screw is loosened and withdrawn, and the occurrence rate of broken nails and broken rods is obviously increased; (2) percutaneous vertebroplasty (pvp) is widely used for treating compression fracture of osteoporotic vertebral bodies, minimally invasive, with definite analgesic effect, but with lost healing opportunities for fracture, suitable for advanced patients; (3) the bone cement pedicle screw can be instantly stabilized, and still has the influence on fracture healing opportunities and obviously prolonged operation time; (4) the expansion pedicle screw cannot be instantly stabilized, and the anti-rotation and anti-pull-out capability is low. It is imperative to design a new pedicle screw for fixation of osteoporotic or reduced bone mass vertebral bodies.
Disclosure of Invention
The purpose of the invention is that: aims at providing a self-locking anti-rotation pedicle screw and a use method thereof, which have the advantages of obviously improving the stability of fixation of the pedicle screw and improving the axial anti-extraction force of the pedicle screw. The screw is not easy to loosen and withdraw, and the occurrence rate of broken nails is low.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the utility model provides a self-locking anti-rotation pedicle of vertebral arch screw, includes integrated into one piece's screw afterbody and screw main part, the U-shaped groove has been seted up on screw afterbody upper portion, first blind hole has been seted up to screw afterbody up end, first blind hole inner wall is equipped with first internal thread, screw main part outer wall is equipped with first external screw thread, the screw main part is equipped with the second blind hole in first blind hole bottom, be equipped with the well pole in the second blind hole, well pole and screw main part threaded connection, well pole lower extreme is big-end-up's toper structure, screw main part lower part radial symmetry is equipped with two breach, the inboard high dimension in breach is greater than the high dimension in the breach outside, wear to have the staple in the breach, the staple outer end exposes screw main part outer wall, staple up end inboard is equipped with the second boss.
Further limited, the screw main part is equipped with the annular groove in second blind hole upper portion edge, the annular groove inner wall is equipped with the second internal thread, well pole up end is equipped with the first boss with annular groove assorted, first boss outer wall is equipped with the second external screw thread with second internal thread assorted, first boss up end is equipped with first interior hexagonal blind hole. By means of the structural design, the first boss is installed in the annular groove, the first boss is sunk into the annular groove on the basis of finishing threaded connection of the middle rod and the screw main body and mutual fixation, and the use of the first internal threads affecting the inner wall of the first blind hole is avoided.
Further defined, the upper end surface of the second boss gradually slopes downwards from outside to inside. By means of the structural design, the second boss is matched with the conical structure at the lower end of the middle rod, so that the tail end of the middle rod can be clamped between two clamping nails more easily, and the use is more convenient.
Further defined, the staple inner end is arcuate. By adopting the structural design, a gap is formed between the two clamping nails, and the tail end of the middle rod can be inserted between the two clamping nails more easily.
Further defined, the pedicle screw further comprises a placement rod, a handle is arranged at the upper end of the placement rod, a threaded column is arranged at the lower end of the placement rod, and a threaded hole matched with the threaded column is vertically formed in the upper end face of the second boss. When the structure design is used, the clamp nails are connected through the threaded columns of the placing rods and the threaded holes in a matched mode, the clamp nails are placed into the gaps through the placing rods, then the placing rods are rotated reversely, the placing rods are taken out, and then the other clamp nails are placed, so that the structure design is more convenient to use.
Further limited, the pedicle screw further comprises a clamping rod, a third boss matched with the annular groove is arranged on the upper end face of the clamping rod, a third external thread matched with the second internal thread is arranged on the outer wall of the third boss, a third inner hexagonal blind hole is formed in the upper end face of the third boss, and a circular groove with a longitudinal section in a trapezoid structure with a narrow upper part and a wide lower part is formed in the lower end face of the clamping rod. After the clamp is placed into the notch through the placement rod, a clamping rod is placed in the screw main body, a second boss of the clamp is clamped through a circular groove of the clamping rod, then the screw main body is implanted into a bone, after implantation is completed, the clamping rod is removed, and a middle rod is installed; by means of the structural design, the outer end of the clamping nail protrudes out of the screw body in the implantation process of the screw body, and damage to bones is avoided.
Further defined, the second boss lateral surface is arc-shaped matched with the circular groove. The outer side of the second boss is matched with the inner wall of the circular groove, the second boss is in surface contact with the clamping rod in the rotating process of the clamping rod, the damage to the clamping rod caused by water caltrop of the second boss can be avoided, and the practicability is higher.
Further defined, the first external thread is a double thread. The structural design not only can obtain faster nail feeding speed, but also has better anti-pulling force relative to single threads, and can avoid complications such as loosening and pulling out of the screw to a certain extent.
The invention also discloses a using method of the self-locking anti-rotation pedicle screw, which comprises the following steps:
s1, assembling a clamp: installing a clamp on the placing rod, then placing the placing rod with the clamp into the screw main body, operating the placing rod to enable the clamp to pass through the notch, enabling the tail end of the clamp to be positioned on the outer side of the screw main body, then taking out the placing rod, and repeating the steps to install the other clamp at the notch position of the screw main body; at the moment, the outer end of the clamping nail is blocked by the notch, and the placing rod is reversely rotated, so that the threaded column can be separated from the threaded hole, and the use is convenient;
s2, installing and clamping rods: pressing the two clamping nails until the tail ends of the clamping nails are hidden in the screw main body, and then installing a clamping rod in the screw main body; the sum of the length dimensions of the two clamping nails is slightly smaller than the outer diameter dimension of the screw main body, when the clamping rod is installed, the outer ends of the clamping nails are not protruded out of the screw main body, and the clamping nails can be prevented from scratching human bones in the process of implanting the screw main body;
s3, implanting bones: implanting the screw body with the clamp pin and the clamping rod into the human skeleton; at the moment, the outer ends of the two staples are blocked by bones, so that the staples cannot fall off;
s4, reinforcing and fixing: the tool is used for clamping the tail part of the screw, then the clamping rod is reversely rotated, the clamping rod is separated from the screw main body, the tool is continuously used for clamping the tail part of the screw, the middle rod is installed in the screw main body, and the middle rod pushes the clamping nail to horizontally move towards two sides in the downward moving process, so that the clamping nail is clamped into the human skeleton, and the screw main body is not easy to loosen and withdraw.
By adopting the technical scheme, the screw main body is of a hollow structure, and the middle rod is arranged in the screw main body, so that the middle rod and the screw main body bear radial shearing force together, the structural strength of the screw main body can be improved, and the conditions of broken nails and broken rods are prevented; the clamping nails extending to the two sides are arranged at the lower end of the screw main body, along with the movement of the middle rod, the clamping nails horizontally move to the two sides and are clamped into human bones, the stability of fixing the pedicle screws is improved, the axial anti-extraction force of the pedicle screws is improved, the screws are not easy to loosen and withdraw, and in addition, the other places of the bones are not damaged.
Drawings
The invention can be further illustrated by means of non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic illustration of a self-locking anti-rotation pedicle screw and method of use according to an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of an embodiment of a self-locking anti-rotation pedicle screw and method of use;
FIG. 3 is an enlarged schematic view of FIG. 2A;
FIG. 4 is a schematic cross-sectional view of a screw body of an embodiment of a self-locking anti-rotation pedicle screw and method of use of the invention;
FIG. 5 is an enlarged schematic view of the structure shown at B in FIG. 4;
FIG. 6 is a schematic illustration of the structure of a self-locking anti-rotation pedicle screw and staple in an embodiment of a method of use of the screw;
FIG. 7 is a schematic illustration of a self-locking anti-rotation pedicle screw and its use in a rod and staple arrangement;
FIG. 8 is a schematic view of a self-locking anti-rotation pedicle screw and method of use of the same, illustrating the construction of a clamping rod in an embodiment of the invention;
FIG. 9 is a schematic illustration of a self-locking anti-rotation pedicle screw and method of use of the invention, in use with a clamping rod;
FIG. 10 is an enlarged schematic view of FIG. 9C;
the main reference numerals are as follows:
screw tail 1, first blind hole 11, screw main part 2, annular groove 21, second blind hole 22, middle pole 3, first boss 31, first hexagon socket 32, breach 4, staple 5, second boss 51, placement pole 6, handle 61, screw thread post 62, screw hole 620, clamping pole 7, third boss 71, third hexagon socket 72, circular recess 73.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following technical scheme of the present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1 to 10, the self-locking anti-rotation pedicle screw comprises a screw tail 1 and a screw main body 2 which are integrally formed, wherein a U-shaped groove is formed in the upper portion of the screw tail 1, a first blind hole 11 is formed in the upper end face of the screw tail 1, first internal threads are formed in the inner wall of the first blind hole 11, first external threads are formed in the outer wall of the screw main body 2, a second blind hole 22 is formed in the bottom of the first blind hole 11 in the screw main body 2, a middle rod 3 is arranged in the second blind hole 22, the middle rod 3 is in threaded connection with the screw main body 2, the lower end of the middle rod 3 is in a conical structure with a large upper portion and a small lower portion, two notches 4 are symmetrically arranged in the lower portion of the screw main body 2 in a radial direction, the height dimension of the inner side of each notch 4 is larger than the height dimension of the outer side of each notch 4, a clamp 5 is penetrated in each notch 4, the outer end of each clamp 5 is exposed out of the outer wall of the screw main body 1, and a second boss 51 is arranged in the inner side of the upper end face of each clamp 5.
The screw main body 2 is provided with an annular groove 21 at the upper edge of the second blind hole 22, the inner wall of the annular groove 21 is provided with a second internal thread, the upper end face of the middle rod 3 is provided with a first boss 31 matched with the annular groove 21, the outer wall of the first boss 31 is provided with a second external thread matched with the second internal thread, and the upper end face of the first boss 31 is provided with a first inner hexagonal blind hole 32. By means of the structural design, the first boss 31 is installed in the annular groove 21, and on the basis that the middle rod 3 is in threaded connection with the screw main body 2 and fixed with each other, the first boss 31 is sunk into the annular groove 21, so that the use of the first internal threads on the inner wall of the first blind hole 11 is avoided.
The upper end surface of the second boss 51 gradually slopes downward from the outside to the inside. By means of the structural design, the second boss 51 is matched with the conical structure at the lower end of the middle rod 3, so that the tail end of the middle rod 3 can be clamped between the two clamping nails 5 more easily, and the use is more convenient.
The inner end of the clip 5 is arc-shaped. The design is such that a gap is formed between the two staples 5, and the end of the middle rod 3 can be more easily inserted between the two staples 5.
The pedicle screw further comprises a placement rod 6, a handle 61 is arranged at the upper end of the placement rod 6, a threaded column 62 is arranged at the lower end of the placement rod 6, and a threaded hole 620 matched with the threaded column 62 is vertically formed in the upper end face of the second boss 51. In the structural design, when the clamp 5 is used, the clamp 5 is connected through the matching of the threaded column 62 of the placing rod 6 and the threaded hole 620, the clamp 5 is placed into the notch 4 through the placing rod 6, then the placing rod 6 is reversely rotated, the placing rod 6 is taken out, and then another clamp is placed, so that the clamp is more convenient to use.
The pedicle screw further comprises a clamping rod 7, a third boss 71 matched with the annular groove 21 is arranged on the upper end face of the clamping rod 7, a third external thread matched with the second internal thread is arranged on the outer wall of the third boss 71, a third inner hexagonal blind hole 72 is arranged on the upper end face of the third boss 71, and a circular groove 73 with a longitudinal section in a trapezoid structure with a narrow upper part and a wide lower part is arranged on the lower end face of the clamping rod 7. After the clamp 5 is placed into the notch 4 through the placement rod 6, a clamping rod 7 is placed in the screw main body 2, the second boss 51 of the clamp 5 is clamped through the circular groove 73 of the clamping rod 7, then the screw main body 2 is implanted into a bone, after implantation is completed, the clamping rod 7 is removed, and the middle rod 3 is installed; by means of the structural design, the outer end of the clamping nail 5 protrudes out of the screw body 2 in the implantation process of the screw body 2, and damage to bones is avoided.
The outer side surface of the second boss 51 is arc-shaped to match the circular groove 73. By means of the structural design, the outer side face of the second boss 51 is matched with the inner wall of the circular groove 73, in the rotation process of the clamping rod 7, the contact between the second boss 51 and the clamping rod 7 is surface contact, the damage to the clamping rod 7 caused by water caltrop of the second boss 51 can be avoided, and the practicability is higher.
The first external thread is a double thread. The structural design not only can obtain faster nail feeding speed, but also has better anti-pulling force relative to single threads, and can avoid complications such as loosening and pulling out of the screw to a certain extent.
The invention also discloses a using method of the self-locking anti-rotation pedicle screw, which comprises the following steps:
s1, assembling a clamp: mounting the clamp 5 on the placement rod 6, then placing the placement rod 6 provided with the clamp 5 into the screw main body 2, operating the placement rod 6 to enable the clamp 5 to pass through the notch 4, enabling the tail end of the clamp 5 to be positioned outside the screw main body 2, then taking out the placement rod 6, and repeating the steps to mount the other clamp 6 at the notch 4 of the screw main body 2; at this time, the outer end of the clip 5 is blocked by the notch 4, and the placement rod 6 is rotated reversely, so that the threaded column 62 can be separated from the threaded hole 620, and the use is convenient;
s2, installing and clamping rods: pressing two clamping nails 5 until the tail ends of the clamping nails 5 are hidden in the screw main body 2, and then installing a clamping rod 7 in the screw main body 2; the sum of the length dimensions of the two clamping nails 5 is slightly smaller than the outer diameter dimension of the screw main body 2, when the clamping rod 7 is installed, the outer ends of the clamping nails 5 are not protruded out of the screw main body 2, and the clamping nails 5 can be prevented from scratching human bones in the process of implanting the screw main body 2;
s3, implanting bones: implanting the screw body 2 with the clamp 5 and the clamping rod 7 into the human skeleton; at the moment, the outer ends of the two clamping nails are blocked by bones, so that the clamping nails 5 are prevented from falling off;
s4, reinforcing and fixing: clamping the screw tail 1 by using a tool, then reversely rotating the clamping rod 7 to enable the clamping rod 7 to be separated from the screw main body 2, continuously clamping the screw tail 1 by using the tool, and then installing the middle rod 3 in the screw main body 2; in the process of downward movement of the middle rod 3, the clamp 5 is pushed to horizontally move to two sides, so that the clamp 5 is clamped into the human skeleton, and the screw main body 2 is not easy to loosen and withdraw.
In the embodiment, the screw main body 2 is of a hollow structure, the middle rod 3 is arranged in the screw main body 2, so that the middle rod 3 and the screw main body 2 bear radial shearing force together, the structural strength of the screw main body 2 can be improved, and the occurrence of broken nails and broken bars is prevented; the clamping nails 5 extending to two sides are arranged at the lower end of the screw main body 2, along with the movement of the middle rod 3, the clamping nails 5 horizontally move to two sides and are clamped into human bones, the stability of fixing the pedicle screws is improved, the axial anti-extraction force of the pedicle screws is improved, the screws are not easy to loosen and withdraw, and in addition, the other places of the bones cannot be injured.
The self-locking anti-rotation pedicle screw and the use method thereof provided by the invention are described in detail. The description of the specific embodiments is only intended to aid in understanding the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. The utility model provides a pedicle of vertebral arch screw is prevented rotating by auto-lock, includes integrated into one piece's screw afterbody (1) and screw main part (2), U-shaped groove has been seted up on screw afterbody (1) upper portion, first blind hole (11) have been seted up to screw afterbody (1) up end, first blind hole (11) inner wall is equipped with first internal thread, screw main part (2) outer wall is equipped with first external screw thread, screw main part (2) are equipped with second blind hole (22) in first blind hole (11) bottom, its characterized in that: be equipped with well pole (3) in second blind hole (22), well pole (3) and screw main part (2) threaded connection, well pole (3) lower extreme is big-end-up's toper structure, screw main part (2) lower part radial symmetry is equipped with two breach (4), the inboard altitude dimension of breach (4) is greater than the altitude dimension in breach (4) outside, wear to be equipped with staple (5) in breach (4), staple (5) outer end exposes screw main part (1) outer wall, staple (5) up end inboard is equipped with second boss (51), screw main part (2) are equipped with annular groove (21) in second blind hole (22) upper portion edge, annular groove (21) inner wall is equipped with second internal thread, pedicle of vertebral arch screw is still including the card establish pole (7), card establish pole (7) up end be equipped with annular groove (21) assorted third boss (71), third boss (71) outer wall be equipped with second internal thread assorted third boss (73), be equipped with circular boss (73) on the arc-shaped side face under the third boss (73) is the circular boss of second internal thread phase-match.
2. A self-locking anti-rotation pedicle screw as claimed in claim 1, wherein: the upper end face of the middle rod (3) is provided with a first boss (31) matched with the annular groove (21), the outer wall of the first boss (31) is provided with a second external thread matched with a second internal thread, and the upper end face of the first boss (31) is provided with a first inner hexagonal blind hole (32).
3. A self-locking anti-rotation pedicle screw as claimed in claim 1, wherein: the upper end surface of the second boss (51) gradually inclines downwards from outside to inside.
4. A self-locking anti-rotation pedicle screw as claimed in claim 1, wherein: the inner end of the clamping nail (5) is arc-shaped.
5. A self-locking anti-rotation pedicle screw as claimed in claim 1, wherein: the pedicle screw further comprises a placement rod (6), a handle (61) is arranged at the upper end of the placement rod (6), a threaded column (62) is arranged at the lower end of the placement rod (6), and a threaded hole (620) matched with the threaded column (62) is vertically formed in the upper end face of the second boss (51).
6. A self-locking anti-rotation pedicle screw as claimed in claim 1, wherein: the first external thread is a double thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810385391.1A CN108498155B (en) | 2018-04-26 | 2018-04-26 | Self-locking anti-rotation pedicle screw and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810385391.1A CN108498155B (en) | 2018-04-26 | 2018-04-26 | Self-locking anti-rotation pedicle screw and use method thereof |
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| CN108498155A CN108498155A (en) | 2018-09-07 |
| CN108498155B true CN108498155B (en) | 2023-06-20 |
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| CN201810385391.1A Active CN108498155B (en) | 2018-04-26 | 2018-04-26 | Self-locking anti-rotation pedicle screw and use method thereof |
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| CN109276305B (en) * | 2018-09-19 | 2021-11-30 | 陆焕彪 | Orthopedic locking screw |
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| CN108498155A (en) | 2018-09-07 |
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