CN114176749A - Anti-pulling percutaneous pedicle screw - Google Patents
Anti-pulling percutaneous pedicle screw Download PDFInfo
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- CN114176749A CN114176749A CN202111470372.7A CN202111470372A CN114176749A CN 114176749 A CN114176749 A CN 114176749A CN 202111470372 A CN202111470372 A CN 202111470372A CN 114176749 A CN114176749 A CN 114176749A
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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
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7064—Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
-
- 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
- A61B2017/564—Methods for bone or joint treatment
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
The utility model relates to an anti-pulling removes percutaneous pedicle of vertebral arch screw, including pin fin and nail pole, the nail pole includes screw thread section and the supplementary canned paragraph of joint, the mounting groove has been seted up on the surface of the supplementary canned paragraph of joint, install the fixed subassembly of joint in the mounting groove, the fixed subassembly of joint includes first joint spare and second joint spare, the one end of first joint spare is rotated and is installed on the mounting groove cell wall, the other end of first joint spare is rotated with the one end of second joint spare and is connected, still install the movable block in the mounting groove, the other end and the movable block of second joint spare rotate and are connected, still install the drive assembly who is used for driving the movable block to remove along the axis direction of nail pole in the supplementary canned paragraph of joint, the fixed subassembly of joint outwards bulges in the mounting groove when drive assembly drive movable block is close to first axis of rotation. The utility model provides an anti-pulling removes fixed subassembly of joint of percutaneous pedicle of vertebral arch screw can cooperate the external screw thread to fix the pedicle of vertebral arch screw together in patient's vertebra, fixed effectual, the difficult nail phenomenon of pulling out that appears.
Description
Technical Field
The application relates to the field of devices for minimally invasive spine percutaneous pedicle screw surgery, in particular to an anti-pulling percutaneous pedicle screw.
Background
The percutaneous pedicle screw has wide clinical application, and has the advantages of small wound, good fixing effect and the like. Percutaneous pedicle screws in the prior art generally comprise a screw head and a screw rod, wherein an external thread is arranged on the outer peripheral surface of the screw rod. The percutaneous pedicle screw is implanted into the vertebral body of a patient during operation and is fixed in the vertebral body by virtue of external threads.
The problems in the application of the percutaneous pedicle screws in the prior art are as follows: different patients 'sclerotin density degree is different, and when patient's sclerotin was comparatively loose, percutaneous pedicle of vertebral arch screw only relied on the difficult stable fixing in the vertebra of screw, and the phenomenon of pulling out the nail appears easily to fixed effect difference, and then causes internal fixation failure, centrum fixed unstable.
Disclosure of Invention
In order to improve the fixed effect that percutaneous pedicle of vertebral arch screw exists among the above-mentioned prior art and appear pulling out the nail easily and then cause internal fixation failure, the fixed unstable technical problem of centrum, this application provides an anti-pulling removes percutaneous pedicle of vertebral arch screw.
The application provides an anti-plucking percutaneous pedicle screw adopts following technical scheme:
an anti-pulling percutaneous pedicle screw comprises a screw head and a screw rod, wherein an external thread is arranged on the outer peripheral surface of the screw rod, the screw rod comprises a screw thread section and a clamping auxiliary fixing section, the clamping auxiliary fixing section is positioned between the screw thread section and the screw head, two ends of the clamping auxiliary fixing section are respectively fixedly connected with the screw thread section and the screw head, an installation groove extending along the axial direction of the screw rod is formed in the outer surface of the clamping auxiliary fixing section, a clamping fixing component is installed in the installation groove and comprises a first clamping piece and a second clamping piece, one end of the first clamping piece is rotatably installed on the groove wall of the installation groove, the other end of the first clamping piece is rotatably connected with one end of the second clamping piece, a moving block capable of moving along the axial direction of the screw rod is further installed in the installation groove, the other end of the second clamping piece is rotatably connected with the moving block, and the rotating axis at the connection position of the first clamping piece and the groove wall of the installation groove is a first rotating axis, the rotation axis of the joint of the first clamping piece and the second clamping piece is a second rotation axis, the rotation axis of the joint of the second clamping piece and the moving block is a third rotation axis, the first rotation axis, the second rotation axis and the third rotation axis are parallel, a driving assembly used for driving the moving block to move along the axis direction of the nail rod is further installed in the clamping auxiliary fixing section, and the clamping fixing assembly protrudes outwards from the mounting groove when the driving assembly drives the moving block to be close to the first rotation axis.
By adopting the technical scheme, when the anti-pull-out percutaneous pedicle screw is used, the anti-pull-out percutaneous pedicle screw is implanted into a vertebral body of a patient, then the driving assembly drives the moving block to be close to the first rotating axis along the axis direction of the screw rod, and at the moment, the clamping and fixing assembly gradually protrudes outwards from the mounting groove and is clamped in the vertebral body of the patient, so that the anti-pull-out percutaneous pedicle screw is more firmly fixed in the vertebral body; when the anti-pulling out percutaneous pedicle screw needs to be taken out, the movable block is driven by the driving assembly to be far away from the first rotating axis along the axis direction of the screw rod, at the moment, the clamping fixing assembly gradually retracts to the installation groove from the vertebral body, and then the anti-pulling out percutaneous pedicle screw is taken out from the vertebral body. The utility model provides a subassembly is fixed to joint that percutaneous pedicle of vertebral arch screw was removed in resistance to plucking can cooperate the external screw thread to remove percutaneous pedicle of vertebral arch screw with resistance to plucking together and fix in patient's vertebra, fixed effectual, the difficult nail phenomenon of pulling out that appears.
Preferably, the axis of the nail rod is positioned in the plane of the clamping and fixing component.
Through adopting above-mentioned technical scheme, can follow the radial outside protrusion of nail pole and block into patient's vertebra when the fixed subassembly of joint is outside protruding, the fixed effect of joint is better.
Preferably, the driving assembly is a screw nut driving assembly, a mounting hole extending along the axis direction of the nail rod is further formed in the auxiliary clamping fixing section, the screw nut driving assembly is mounted in the mounting hole and comprises a screw rod and a nut mounted on the screw rod in a screwing mode, the screw rod is rotatably mounted in the mounting hole, the mounting hole is communicated with the mounting hole, the moving block is fixedly connected with the nut, the moving block is matched with the groove wall of the mounting hole in a guiding and moving mode, a through hole coaxial with the mounting hole is formed in the nail head, one end, far away from the thread section, of the screw rod penetrates through the through hole and extends outwards to form an overhanging end, the screw rod is axially and limitedly mounted in the mounting hole, and the screw rod can move in the mounting hole along the axis direction of the nail rod by rotating the driving nut.
Through adopting above-mentioned technical scheme, drive assembly's structure is very simple, convenient the setting and the precision that the drive movable block removed is higher.
Preferably, the diameter of the through hole is the same as that of the screw rod, the diameter of the through hole is smaller than that of the mounting hole, a stop protrusion is further arranged on a portion, located in the mounting hole, of the screw rod, and protrudes out of the screw rod along the radial direction of the screw rod, one end, close to the threaded section, of the screw rod abuts against an end face of a joint of the threaded section and the clamping auxiliary fixing section, and the stop protrusion abuts against an end face of a joint of the screw head and the clamping auxiliary fixing section.
By adopting the technical scheme, the axial movement, stopping and limiting of the screw rod are realized.
Preferably, the thread section and the inside of the screw rod are both provided with guide pin holes which are communicated along the axial direction of the nail rod, and the axial line of the guide pin holes is collinear with the axial line of the nail rod.
Through adopting above-mentioned technical scheme, can hold the guide pin through the guide pin hole when the operation.
Preferably, the side faces, back to the screw rod, of the first clamping piece and the second clamping piece are fixedly provided with protruding clamping teeth, and the clamping teeth are of a protruding thorn-shaped structure.
Through adopting above-mentioned technical scheme, when the outside protrusion card of the fixed subassembly of joint was gone into in patient's the vertebra, the latch also can block in the vertebra to further improve fixed effect.
Preferably, the overhanging end of the screw rod is also fixedly provided with a rotating part protruding along the radial direction of the screw rod, and the rotating part is used for facilitating the rotation of the screw rod by an operator.
By adopting the technical scheme, the screw rod can be conveniently rotated by an operator.
Preferably, the auxiliary clamping fixing section is of a cylindrical structure, the mounting grooves are provided with at least two mounting grooves at intervals along the circumferential direction of the auxiliary clamping fixing section, and clamping fixing components are mounted in the mounting grooves.
By adopting the technical scheme, the fixing effect of the anti-pull percutaneous pedicle screw in the vertebral body can be further improved.
Drawings
FIG. 1 is a perspective view of an anti-pullout percutaneous pedicle screw according to an embodiment of the application;
FIG. 2 is a top view of an anti-pullout percutaneous pedicle screw of an embodiment of the application;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
fig. 4 is an enlarged view of the structure at B in fig. 3.
Description of reference numerals: 1. a nail head; 2. a nail rod; 21. a threaded segment; 22. clamping the auxiliary fixing section; 221. mounting grooves; 222. mounting holes; 23. clamping and fixing the assembly; 231. a first clip member; 232. a second clip member; 233. clamping teeth; 24. a moving block; 25. a lead screw nut drive assembly; 251. a lead screw; 2511. a cantilevered end; 2512. a rotating part; 2513. a stop protrusion; 252. a nut; 3. and (6) a guide pin hole.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
Referring to fig. 1 and 2, the embodiment of the application discloses an anti-extraction percutaneous pedicle screw, which comprises a screw head 1 and a screw rod 2, wherein an external thread is arranged on the outer peripheral surface of the screw rod 2. The nail rod 2 comprises a thread section 21 and a clamping auxiliary fixing section 22, and the clamping auxiliary fixing section 22 is of a cylindrical structure. The clamping auxiliary fixing section 22 is positioned between the threaded section 21 and the nail head 1, and two ends of the clamping auxiliary fixing section 22 are respectively fixedly connected with the threaded section 21 and the nail head 1. Set up the mounting groove 221 that extends along the axis direction of nail pole 2 on the surface of the supplementary fixed section 22 of joint, the even interval in circumference of the supplementary fixed section 22 of joint of mounting groove 221 edge is provided with 4, all installs the fixed subassembly 23 of joint in each mounting groove 221.
Referring to fig. 3 and 4, the clip fixing assembly 23 includes a first clip member 231 and a second clip member 232. One end of the first clamping member 231 is rotatably installed on the groove wall of the installation groove 221 through a rotating shaft, and the other end of the first clamping member 231 is rotatably connected with one end of the second clamping member 232 through a rotating shaft. A moving block 24 capable of moving along the axis direction of the nail rod 2 is further installed in the installation groove 221, and the other end of the second clamping piece 232 is rotatably connected with the moving block 24 through a rotating shaft. The axis of rotation of first joint spare 231 and mounting groove 221 cell wall junction is first axis of rotation, and the axis of rotation of first joint spare 231 and second joint spare 232 junction is the second axis of rotation, and the axis of rotation of second joint spare 232 and movable block 24 rotation junction is the third axis of rotation, and first axis of rotation, second axis of rotation and third axis of rotation are parallel, and the axis of nail pole 2 is located the fixed subassembly 23 place plane of joint.
With continued reference to fig. 3 and 4, the auxiliary fastening section 22 is further provided therein with an installation hole 222 extending along the axial direction of the nail shaft 2, the axis of the installation hole 222 is collinear with the axis of the nail shaft 2, and each installation groove 221 is communicated with the installation hole 222. A driving component for driving the moving block 24 to move along the axial direction of the nail rod 2 is also arranged in the mounting hole 222 of the clamping auxiliary fixing section 22. When the driving assembly drives moving block 24 to approach the first rotation axis, clamping and fixing assembly 23 protrudes outwards from mounting groove 221. In the present embodiment, the driving assembly is a lead screw nut driving assembly 25, and the lead screw nut driving assembly 25 is installed in the installation hole 222. The lead screw nut drive assembly 25 includes a lead screw 251 and a nut 252 screw-mounted on the lead screw 251, the lead screw 251 being rotatably mounted in the mounting hole 222. Moving block 24 is fixedly connected with nut 252, and moving block 24 is in guiding moving fit with the groove wall of mounting groove 221.
With continued reference to fig. 3 and 4, a through hole coaxial with the mounting hole 222 is further formed in the nail head 1, and an end of the lead screw 251 remote from the threaded section 21 passes through the through hole and extends outward to form an overhanging end 2511. The overhanging end 2511 of the screw 251 is further fixedly provided with a rotating portion 2512 protruding in the radial direction of the screw 251, the circumferential surface of the rotating portion 2512 has the same shape as the circumferential surface of the hexagonal nut 252, and the rotating portion 2512 is used for facilitating the rotation of the screw 251 by an operator. The diameter of the through hole is the same as that of the lead screw 251, and the diameter of the through hole is smaller than that of the mounting hole 222. The portion of the screw 251 located in the mounting hole 222 is further provided with an annular stop protrusion 2513, and the stop protrusion 2513 protrudes from the screw 251 in the radial direction of the screw 251. One end of the screw 251 close to the threaded section 21 abuts against the end face of the joint of the threaded section 21 and the clamping auxiliary fixing section 22, and the stop protrusion 2513 abuts against the end face of the joint of the screw head 1 and the clamping auxiliary fixing section 22, so that the screw 251 is axially limited and mounted in the mounting hole 222, and the screw 251 can only rotate and cannot axially move. The lead screw 251 can be moved in the axial direction of the nail shaft 2 in the mounting hole 222 by rotating the drive nut 252. The screw thread section 21 and the lead screw 251 are internally provided with guide pin holes 3 which are communicated along the axial direction of the nail rod 2, the axes of the guide pin holes 3 are collinear with the axes of the nail rod 2, and guide pins can be accommodated in the guide pin holes 3 during surgery. The side surfaces of the first clamping member 231 and the second clamping member 232, which face away from the screw 251, are further fixedly provided with protruding clamping teeth 233, and the clamping teeth 233 are of a bayonet-shaped structure. When the clip fixing assembly 23 protrudes outward and is engaged with the vertebral body of a patient, the latch 233 can also be engaged with the vertebral body, thereby further improving the fixing effect.
The implementation principle of the embodiment of the application is as follows: when the anti-pull-out percutaneous pedicle screw is used, the anti-pull-out percutaneous pedicle screw is implanted into a vertebral body of a patient, then the moving block 24 is driven by the lead screw nut driving component 25 to be close to a first rotating axis along the axis direction of the screw rod 2, and at the moment, the clamping and fixing component 23 gradually protrudes outwards from the mounting groove 221 and is clamped in the vertebral body of the patient, so that the anti-pull-out percutaneous pedicle screw is more firmly fixed in the vertebral body; when the anti-extraction percutaneous pedicle screw needs to be taken out, the moving block 24 is driven by the lead screw nut driving component 25 to be far away from the first rotating axis along the axis direction of the screw rod 2, at the moment, the clamping and fixing component 23 gradually retreats from the vertebral body to the mounting groove 221, and then the anti-extraction percutaneous pedicle screw is taken out from the vertebral body.
The clamping fixing component 23 for resisting the pulling and removing the percutaneous pedicle screws can be matched with the external threads to fix the resisting pulling and removing the percutaneous pedicle screws in the vertebral bodies of patients, and is good in fixing effect and not easy to pull out. The anti-pulling percutaneous pedicle screw can be applied to the fixation of osteoporosis patients, so that the defects of the traditional pedicle screw are overcome, and the screw pulling risk is reduced; meanwhile, the bone cement screw has more advantages than a bone cement screw, reduces complications caused by the bone cement, reduces the operation difficulty and improves the operation efficiency; compared with the traditional percutaneous pedicle screws and bone cement screws, the percutaneous pedicle screws are safer, more efficient and more convenient.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides an anti-pulling removes percutaneous pedicle of vertebral arch screw, includes pin fin (1) and nail pole (2), is provided with the external screw thread on nail pole (2) outer peripheral face, its characterized in that: the nail rod (2) comprises a thread section (21) and a clamping auxiliary fixing section (22), the clamping auxiliary fixing section (22) is located between the thread section (21) and the nail head (1), two ends of the clamping auxiliary fixing section (22) are fixedly connected with the thread section (21) and the nail head (1) respectively, an installation groove (221) extending along the axis direction of the nail rod (2) is formed in the outer surface of the clamping auxiliary fixing section (22), a clamping fixing component (23) is installed in the installation groove (221), the clamping fixing component (23) comprises a first clamping piece (231) and a second clamping piece (232), one end of the first clamping piece (231) is rotatably installed on the groove wall of the installation groove (221), the other end of the first clamping piece (231) is rotatably connected with one end of the second clamping piece (232), a moving block (24) capable of moving along the axis direction of the nail rod (2) is further installed in the installation groove (221), the other end and the movable block (24) of second joint spare (232) rotate to be connected, the axis of rotation of first joint spare (231) and mounting groove (221) cell wall junction is first axis of rotation, the axis of rotation of first joint spare (231) and second joint spare (232) junction is the second axis of rotation, the axis of rotation of second joint spare (232) and movable block (24) rotation junction is the third axis of rotation, first axis of rotation, second axis of rotation and third axis of rotation are parallel, still install the drive assembly who is used for driving movable block (24) along the axis direction removal of nail pole (2) in the supplementary fixed section of joint (22), joint fixed component (23) outwards bulge in mounting groove (221) when drive assembly drive movable block (24) are close to first axis of rotation.
2. The anti-pullout percutaneous pedicle screw as claimed in claim 1, wherein: the axis of the nail rod (2) is positioned in the plane of the clamping and fixing component (23).
3. The anti-pullout percutaneous pedicle screw as claimed in claim 2, wherein: the driving assembly is a screw nut driving assembly (25), a mounting hole (222) extending along the axial direction of the nail rod (2) is further formed in the clamping auxiliary fixing section (22), the screw nut driving assembly (25) is mounted in the mounting hole (222), the screw nut driving assembly (25) comprises a screw rod (251) and a nut (252) mounted on the screw rod (251) in a screwing mode, the screw rod (251) is rotatably mounted in the mounting hole (222), the mounting groove (221) is communicated with the mounting hole (222), the moving block (24) is fixedly connected with the nut (252), the moving block (24) is movably matched with the groove wall of the mounting groove (221) in a guiding mode, a through hole coaxial with the mounting hole (222) is formed in the nail head (1), one end, far away from the thread section (21), of the screw rod (251 penetrates through the through hole and extends outwards to form an overhanging end (2511), and the screw rod (251) is axially limited and mounted in the mounting hole (222), the screw (251) can move in the axial direction of the nail shaft (2) in the mounting hole (222) by rotating the drive nut (252).
4. The anti-pullout percutaneous pedicle screw according to claim 3, wherein: the diameter of the through hole is the same as that of the lead screw (251), the diameter of the through hole is smaller than that of the mounting hole (222), a stop protrusion (2513) is further arranged on the portion, located in the mounting hole (222), of the lead screw (251), the stop protrusion (2513) protrudes out of the lead screw (251) along the radial direction of the lead screw (251), one end, close to the threaded section (21), of the lead screw (251) abuts against the end face of the joint of the threaded section (21) and the clamping auxiliary fixing section (22), and the stop protrusion (2513) abuts against the end face of the joint of the nail head (1) and the clamping auxiliary fixing section (22).
5. The anti-pullout percutaneous pedicle screw according to claim 4, wherein: the thread section (21) and the lead screw (251) are internally provided with guide pin holes (3) which are communicated along the axial direction of the nail rod (2), and the axial lines of the guide pin holes (3) and the axial line of the nail rod (2) are collinear.
6. The anti-pullout percutaneous pedicle screw according to claim 5, wherein: the side faces, back to the screw rod (251), of the first clamping piece (231) and the second clamping piece (232) are fixedly provided with protruding clamping teeth (233), and the clamping teeth (233) are of a protruding thorn-shaped structure.
7. The anti-pullout percutaneous pedicle screw according to claim 6, wherein: the overhanging end (2511) of the lead screw (251) is also fixedly provided with a rotating part (2512) protruding along the radial direction of the lead screw (251), and the rotating part (2512) is used for facilitating an operator to rotate the lead screw (251).
8. The anti-pullout percutaneous pedicle screw according to any one of claims 1-7, wherein: the auxiliary clamping fixing section (22) is of a cylindrical structure, at least two installation grooves (221) are formed in the circumferential direction of the auxiliary clamping fixing section (22) at intervals, and clamping fixing assemblies (23) are installed in the installation grooves (221).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111470372.7A CN114176749A (en) | 2021-12-03 | 2021-12-03 | Anti-pulling percutaneous pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111470372.7A CN114176749A (en) | 2021-12-03 | 2021-12-03 | Anti-pulling percutaneous pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114176749A true CN114176749A (en) | 2022-03-15 |
Family
ID=80542233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111470372.7A Withdrawn CN114176749A (en) | 2021-12-03 | 2021-12-03 | Anti-pulling percutaneous pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114176749A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114917009A (en) * | 2022-05-12 | 2022-08-19 | 中国人民解放军总医院第四医学中心 | Full-thread lag screw with enhanced mechanics |
-
2021
- 2021-12-03 CN CN202111470372.7A patent/CN114176749A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114917009A (en) * | 2022-05-12 | 2022-08-19 | 中国人民解放军总医院第四医学中心 | Full-thread lag screw with enhanced mechanics |
| CN114917009B (en) * | 2022-05-12 | 2022-10-25 | 中国人民解放军总医院第四医学中心 | Full-thread lag screw with enhanced mechanics |
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Application publication date: 20220315 |