CN104546106A - High-hold bone screw - Google Patents
High-hold bone screw Download PDFInfo
- Publication number
- CN104546106A CN104546106A CN201510037728.6A CN201510037728A CN104546106A CN 104546106 A CN104546106 A CN 104546106A CN 201510037728 A CN201510037728 A CN 201510037728A CN 104546106 A CN104546106 A CN 104546106A
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- Prior art keywords
- screw
- shank
- groove
- tail form
- boss
- Prior art date
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Classifications
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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
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
-
- 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
-
- 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
- A61B17/869—Pins or screws or threaded wires; nuts therefor characterised by an open form, e.g. wire helix
-
- 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
Abstract
The invention relates to the technical field of medical instruments, in particular to a high-hold bone screw which is reasonable in design, novel in structure, high in hold, less prone to looseness and capable of preventing secondary injury. The high-hold bone screw comprises a bone screw body and an expansion screw rod. The high-hold bone screw is characterized in that a screw tip of the bone screw body is separated from a screw rod, an inverted-cone-shaped through hole is formed in the screw rod, an inner thread is arranged on the wall of the through hole, an expansion groove with an downward opening is formed in the screw rod, dovetail connectors are arranged on two sides of the bottom end of the screw rod correspondingly, a round groove is formed in the center, corresponding to the lower end of the screw rod, of the upper end face of the screw tip, a rotating disc is arranged in the round groove, at least one arc-shaped groove is formed in the wall, corresponding to the rotating disc, of the screw tip, dovetail connection grooves are formed in the wall of the round groove, and the screw rod is connected with the screw tip through the dovetail connectors and the dovetail connection grooves. The high-hold bone screw has the advantages of high hold, less proneness to looseness, capability of preventing secondary injury and the like.
Description
Technical field
The present invention relates to technical field of medical instruments, specifically a kind of reasonable in design, novel structure, hold are high not easily loosens and can prevent the high holding-force bone screw of secondary injury.
Background technology
At present, for the internal fixtion device that fracture site is fixing, separately or combinationally use with blade plate, conventional has cancellous bone screw, os integumentale screw, bone bolt and hollow screw etc., and general bone screw is that the spiral shell head group being provided with interior hexagonal by screwed screw rod and head becomes, and structure is identical with common screw, but, bone due to people is different from other carriers, and this just requires that the structure of bone screw is different from other screws, stricter to the requirement of bone screw.
Along with increasingly sharpening of China's aged tendency of population, increasing sufferers of osteoporosis face needs to carry out internal fixation operation because of spinal disease.But, under osteoporosis condition, pedicle screw and surrounding sclerotin bond strength obviously reduce, the hold of screw is declined, screw loosening, displacement, the complication such as to deviate to happen occasionally, for the problems referred to above, the utility model patent of the patent No. 2014201031055 medical anchor formula pedicle screw, the steady pin of two " J " shapes is increased in screw inside, the steady pin stretched out by side changes the way of contact of pedicle screw and vertebral body, achieve and the combining closely of spongy bone, because upper end is not fixed, when activity aggravation very easily causes " J " shape steady pin to mark from lower end, through bone, human body is damaged, when operate miss or when screw need be taken out due to certain needs, in rotary course, the dynamics of people is uneven, the external screw thread of bone screw is easy to cause secondary injury to bone.
Summary of the invention
The object of the invention is to solve above-mentioned the deficiencies in the prior art, provide that a kind of reasonable in design, novel structure, hold are high not easily to be loosened and can prevent the high holding-force bone screw of secondary injury.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of high holding-force bone screw, comprise bone screw and dilating screw, bone screw upper end is provided with the driving hole of interior hexagonal, it is characterized in that screw tip and the shank of screw of bone screw are separated, the through hole with the handstand taper of shank of screw coaxial line is provided with in shank of screw, through-hole wall is provided with the female thread matched with dilating screw, shank of screw is provided with the expansion slot that Open Side Down, corresponding both sides, shank of screw bottom are respectively equipped with dove-tail form union joint, the screw tip upper surface center corresponding with shank of screw lower end is provided with circular groove, rotating disk is provided with in circular groove, the screw tip wall that rotating disk is corresponding is at least provided with an arcuate groove, locking pin one end is located in arcuate groove, the other end is walked around part rotating disk and is fixedly connected with rotating disk, circular groove wall is provided with dove-tail form link slot, shank of screw is connected with screw tip with dove-tail form link slot through dove-tail form union joint, shank of screw front end face diameter is not less than screw tip upper surface diameter corresponding with it, dilating screw upper end is provided with yi word pattern or cross head of screw, lower end is provided with connection boss, connect boss to match with the connecting groove of rotating disk upper end, the height connecting boss is less than the degree of depth of connecting groove, the height connecting boss is greater than the degree of depth of dove-tail form link slot.
Described shank of screw is provided with two symmetrical expansion slots that Open Side Down, facilitates dove-tail form union joint to extend out along swallow-tail form link slot straight line.
The bottom surface of described circular groove, lower than the bottom surface of dove-tail form link slot, makes to be placed in rotating disk upper surface in circular groove not higher than the bottom surface of swallow-tail form link slot, facilitates slipping into and skidding off of dove-tail form union joint.
Described arcuate groove and arc locking pin are clockwise array distribution, and arc locking pin screws out clockwise along with rotating disk.
The high holding-force bone screw of described one, it is characterized in that shank of screw inner via hole bottom is provided with female thread, dilating screw upper end is provided with yi word pattern or cross head of screw, dilating screw bottom is provided with the expansion boss of arc transiting surface, expansion boss is provided with the external screw thread with shank of screw screw-internal thread fit, what while saving material, facilitate shank of screw extends out expansion, reduce the labor intensity of medical worker, expansion platform lower end is provided with connection boss, connects boss and matches with the connecting groove of rotating disk upper end.
Described rotating disk upper surface is higher than dove-tail form link slot bottom surface, connecting groove is communicated with dove-tail form link slot, swallow-tail form union joint, connection boss and swallow-tail form link slot, connecting groove are connected, the degree of depth of connecting groove is greater than connection boss height, ensure to connect the effect that can not produce downward power when boss moves down in connecting groove to screw tip, also ensure that rotating disk and arc locking pin are at same Plane Rotation simultaneously.
Described rotating disk side vertical direction is provided with at least one lonely type locking pin successively, the screw tip corresponding with arc locking pin is provided with arc groove, arc locking pin passes from arcuate groove, different directions and differing heights be all provided with locking pin pass formed Herba Agrimoniae bar-shaped, increase the hold to sclerotin.
Be provided with draw-in groove in described bone screw inner hexagon spanner hole, the head of screw of dilating screw is provided with deck, and deck, by the kelly that is articulated and connected, enters after sclerotin is fixed and proceeds in draw-in groove by kelly, prevent the convolution of dilating screw.
The present invention, owing to adopting said structure, has reasonable in design, novel structure, hold height and not easily loosens and can prevent the advantages such as secondary injury.
Accompanying drawing explanation
Fig. 1 is without dilating screw package assembly schematic diagram in the present invention.
Fig. 2 is the front view after overall package of the present invention.
Fig. 3 is the left view of Fig. 2.
Fig. 4 is the top view of Fig. 1.
Fig. 5 be screw tip overlook enlarged drawing.
Fig. 6 is the left view of Fig. 5.
Fig. 7 is the A-A profile of Fig. 5.
Fig. 8 is the sectional view of shank of screw in the present invention.
Fig. 9 is the structural representation of dilating screw in the present invention.
Reference numeral: screw tip 1, shank of screw 2, through hole 3, female thread 4, expansion slot 5, dove-tail form union joint 6, circular groove 7, rotating disk 8, arcuate groove 9, locking pin 10, dove-tail form link slot 11, connection boss 12, connecting groove 13, dilating screw 14, expansion boss 15, head of screw 16, kelly 17, draw-in groove 18.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described:
As shown in drawings, a kind of high holding-force bone screw, comprise bone screw and dilating screw, bone screw upper end is provided with the driving hole of interior hexagonal, it is characterized in that screw tip 1 and the shank of screw 2 of bone screw are separated, the through hole 3 with the handstand taper of shank of screw 2 coaxial line is provided with in shank of screw 2, shank of screw inner via hole 3 bottom is provided with female thread 4, dilating screw 14 upper end is provided with yi word pattern or cross head of screw 16, the head of screw 16 of dilating screw is provided with deck, deck is by the kelly 17 that is articulated and connected, the draw-in groove 18 matched with kelly is provided with in bone screw inner hexagon spanner hole, inner hexagon spanner hole circle week is all provided with draw-in groove 18, facilitate fixing at any time of kelly 17, entering after sclerotin is fixed proceeds in draw-in groove by kelly, prevent the convolution of dilating screw, dilating screw 14 bottom is provided with the expansion boss 15 of arc transiting surface, expansion boss 15 is provided with the external screw thread coordinated with shank of screw female thread 4, what while saving material, facilitate shank of screw extends out expansion, reduce the labor intensity of medical worker, expansion boss 15 lower end is provided with and connects boss 12 or T stage, head of screw 16, expansion boss 15 be connected boss 12 axis on the same line, connect boss 12 to match with the connecting groove 13 of rotating disk 8 upper end, the height connecting boss 12 is less than the degree of depth of connecting groove 13, the height connecting boss 12 is greater than the degree of depth of dove-tail form link slot 11, the convenient boss that connects moves up and down in connecting groove, shank of screw 2 is provided with two symmetrical expansion slots that Open Side Down 5, dove-tail form union joint 6 is facilitated to extend out along swallow-tail form link slot 11 straight line, corresponding both sides, shank of screw 2 bottom are respectively equipped with dove-tail form union joint 6, the screw tip 1 upper surface center corresponding with shank of screw 2 lower end is provided with circular groove 7, rotating disk 8 is provided with in circular groove 7, screw tip 1 upper wall of rotating disk 8 correspondence is provided with four arcuate grooves 9, different vertical height is respectively equipped with two arcuate grooves 9, locking pin 10 one end is located in arcuate groove 9, the other end is walked around part rotating disk and is fixedly connected with rotating disk 8, circular groove 7 wall is provided with dove-tail form link slot 11, arcuate groove 9 and arc locking pin 10 are in clockwise array distribution, arc locking pin 10 screws out clockwise along with rotating disk 8, shank of screw 2 is connected with screw tip 1 with dove-tail form link slot 11 through dove-tail form union joint 6, shank of screw 2 front end face diameter is not less than screw tip 1 upper surface diameter corresponding with it, namely when inside is without dilating screw 14, the front end face of shank of screw 2 is less than screw tip 1 upper surface diameter corresponding with it, ensure that screw can bounce back after expanding, avoid the secondary injury to sclerotin, after shank of screw 2 inside is provided with dilating screw 14, and then the shank of screw 2 of taper expands to extend out and forms bone screw structure under the effect of dilating screw, after entering sclerotin, dilating screw continues to rotate, shank of screw 2 front end face diameter is made to be not less than screw tip 1 upper surface diameter, realize screw to maximize the hold of sclerotin, arcuate groove 9 in screw tip 1 is not limited to four, also be not limited to arrangement regulation simultaneously, multiple arcuate groove 9 coordinates with arc locking pin 10, when the locking pin 10 on rotating disk 8 is placed in circular groove 7, arc locking pin 10 is just in time fastened in arcuate groove 9, when the rotating curved locking pin 10 of rotating disk 8 produces, form the shape of mace or tree root, reinforce bone screw to the hold of sclerotin.
In the present invention, when bottom surface lower than dovetail grooved link slot 11, the bottom surface of circular groove 7, make to be placed in rotating disk 8 upper surface in circular groove 7 not higher than the bottom surface of swallow-tail form link slot 11, facilitate slipping into and skidding off of dove-tail form union joint 6, when rotating disk 8 upper surface is higher than dove-tail form link slot 11 bottom surface, connecting groove 13 is communicated with dove-tail form link slot 11, swallow-tail form union joint 6, connect boss 12 and swallow-tail form link slot 11, connecting groove 13 is connected, the height connecting boss 12 is less than the degree of depth of connecting groove 13, the height connecting boss 12 is greater than the degree of depth of dove-tail form link slot 11, ensure to connect the effect that can not produce downward power when boss 12 moves down in connecting groove 13 to screw tip, also ensure that rotating disk and arc locking pin are at same Plane Rotation simultaneously.
The present invention in use, first bone screw is assembled, rotating disk 8 with locking pin is arranged in screw tip 1, then, shank of screw 2 is connected with screw tip 1 through swallow-tail form union joint 6, again dilating screw 14 is screwed in shank of screw 2, shank of screw 2 is expanded and extends out formation bone screw structure, the connection boss 12 of dilating screw 14 front end with corresponding dove-tail form union joint 6 just in time on same perpendicular, and the lower surface of swallow-tail form union joint 6 is not less than connection boss 12 lower surface, after the swallow-tail form union joint 6 of shank of screw 2 front end slides into, connection boss 12 is fastened on connecting groove 13 upper end on rotating disk 9, again whole bone screw is screwed in sclerotin, after entering specific position, dilating screw 14 is continued rotate, shank of screw 2 continues expansion and extends out, increase the hold of sclerotin and screw tip 1, connect boss 12 afterwards and contact connecting groove 13, rotating disk 8 makes arc locking pin 10 screw out along with the rotation of dilating screw 14, and then fixed bone screw, the hold of same increasing bone screw and sclerotin, when needing due to position inaccuracy or other reasons to screw out bone screw, first, dilating screw 14 is screwed out, rotating disk 8 turns round, and then arc locking pin 11 is circled round in arcuate groove 9, dilating screw 14 screws out and is also bounced back by the shank of screw 2 of taper simultaneously, the dove-tail form union joint 6 of shank of screw 2 front end is sliding in dove-tail form link slot 11, whole bone screw reduces the hold of sclerotin, and then when not producing injury to sclerotin, whole bone screw is taken out, therefore, avoid in back-out process due to the secondary injury to sclerotin that external force is uneven or other factors cause.
The present invention is owing to adopting said structure, screw tip 1 upper surface is provided with the rotating disk 8 connecting arc locking pin 10, sclerotin hold can be increased during back-out, multiple arc locking pin produces the structure of mace or tree root shape, achieve hold to maximize, shank of screw 2 is provided with expansion slot 5 shank of screw can be made to expand inside contract, avoid the secondary injury to sclerotin, there is reasonable in design, novel structure, hold height and not easily loosen and can the advantages such as secondary injury be prevented.
Claims (8)
1. a high holding-force bone screw, comprise bone screw and dilating screw, bone screw upper end is provided with the driving hole of interior hexagonal, it is characterized in that screw tip and the shank of screw of bone screw are separated, the through hole with the handstand taper of shank of screw coaxial line is provided with in shank of screw, through-hole wall is provided with the female thread matched with dilating screw, shank of screw is provided with the expansion slot that Open Side Down, corresponding both sides, shank of screw bottom are respectively equipped with dove-tail form union joint, the screw tip upper surface center corresponding with shank of screw lower end is provided with circular groove, rotating disk is provided with in circular groove, the screw tip wall that rotating disk is corresponding is at least provided with an arcuate groove, locking pin one end is located in arcuate groove, the other end is walked around part rotating disk and is fixedly connected with rotating disk, circular groove wall is provided with dove-tail form link slot, shank of screw is connected with screw tip with dove-tail form link slot through dove-tail form union joint, shank of screw front end face diameter is not less than screw tip upper surface diameter corresponding with it, dilating screw upper end is provided with yi word pattern or cross head of screw, lower end is provided with connection boss, connect boss to match with the connecting groove of rotating disk upper end, the height connecting boss is less than the degree of depth of connecting groove, the height connecting boss is greater than the degree of depth of dove-tail form link slot.
2. the high holding-force bone screw of one according to claim 1, is characterized in that shank of screw is provided with two symmetrical expansion slots that Open Side Down.
3. the high holding-force bone screw of one according to claim 1, is characterized in that the bottom surface of the bottom surface of circular groove lower than dovetail grooved link slot.
4. the high holding-force bone screw of one according to claim 1, is characterized in that arcuate groove and arc locking pin are clockwise array distribution.
5. the high holding-force bone screw of one according to claim 1, it is characterized in that shank of screw inner via hole bottom is provided with female thread, dilating screw upper end is provided with yi word pattern or cross head of screw, dilating screw bottom is provided with the expansion boss of arc transiting surface, expansion boss is provided with the external screw thread with shank of screw screw-internal thread fit, expansion boss lower end is provided with connection boss, connects boss and matches with the connecting groove of rotating disk upper end.
6. the high holding-force bone screw of one according to claim 5, it is characterized in that rotating disk upper surface is higher than dove-tail form link slot bottom surface, connecting groove is communicated with dove-tail form link slot, and swallow-tail form union joint, connection boss and swallow-tail form link slot, connecting groove are connected.
7. the high holding-force bone screw of one according to claim 1, it is characterized in that rotating disk side vertical direction is provided with at least one lonely type locking pin successively, the screw tip corresponding with arc locking pin is provided with arc groove.
8. a kind of high holding-force bone screw according to claim 1 or 5, it is characterized in that being provided with draw-in groove in bone screw inner hexagon spanner hole, the head of screw of dilating screw is provided with deck, and deck is by the kelly that is articulated and connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510037728.6A CN104546106B (en) | 2015-01-26 | 2015-01-26 | A kind of high holding-force bone screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510037728.6A CN104546106B (en) | 2015-01-26 | 2015-01-26 | A kind of high holding-force bone screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104546106A true CN104546106A (en) | 2015-04-29 |
| CN104546106B CN104546106B (en) | 2016-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510037728.6A Expired - Fee Related CN104546106B (en) | 2015-01-26 | 2015-01-26 | A kind of high holding-force bone screw |
Country Status (1)
| Country | Link |
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| CN (1) | CN104546106B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105443539A (en) * | 2016-01-17 | 2016-03-30 | 罗洋洋 | Novel bolt |
| CN108013929A (en) * | 2018-01-03 | 2018-05-11 | 江苏荷普医疗科技股份有限公司 | The centrum-nail fastening device for preventing thread bush from turning round |
| CN108451660A (en) * | 2018-04-18 | 2018-08-28 | 锦州医科大学附属第医院 | A plant dental structure |
| WO2022062051A1 (en) * | 2020-09-23 | 2022-03-31 | 山东冠龙医疗用品有限公司 | Expandable anti-pullout pedicle screw |
| 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 |
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| EP1430846A1 (en) * | 2002-12-20 | 2004-06-23 | BIEDERMANN MOTECH GmbH | Tubular element for implant for spinal or bone surgery |
| CN201019827Y (en) * | 2007-01-12 | 2008-02-13 | 青岛大学医学院附属医院 | Expansion screw for orthopaedics |
| CN100591297C (en) * | 2005-07-08 | 2010-02-24 | 比德曼莫泰赫有限公司 | Bone anchoring element |
| EP2446842A1 (en) * | 2010-10-26 | 2012-05-02 | Christian Röbling | Device for stabilising a spine |
| CN203524761U (en) * | 2013-09-30 | 2014-04-09 | 天津正天医疗器械有限公司 | Expansion type metal bone-setting locking screw |
| CN203763222U (en) * | 2014-03-07 | 2014-08-13 | 中国人民解放军第四军医大学 | Medical anchor type vertebral pedicle screw |
| CN104224302A (en) * | 2014-09-02 | 2014-12-24 | 浙江科惠医疗器械有限公司 | Locking bone screw with expansionstructure |
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2015
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1430846A1 (en) * | 2002-12-20 | 2004-06-23 | BIEDERMANN MOTECH GmbH | Tubular element for implant for spinal or bone surgery |
| CN100591297C (en) * | 2005-07-08 | 2010-02-24 | 比德曼莫泰赫有限公司 | Bone anchoring element |
| CN201019827Y (en) * | 2007-01-12 | 2008-02-13 | 青岛大学医学院附属医院 | Expansion screw for orthopaedics |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105443539A (en) * | 2016-01-17 | 2016-03-30 | 罗洋洋 | Novel bolt |
| CN108013929A (en) * | 2018-01-03 | 2018-05-11 | 江苏荷普医疗科技股份有限公司 | The centrum-nail fastening device for preventing thread bush from turning round |
| CN108451660A (en) * | 2018-04-18 | 2018-08-28 | 锦州医科大学附属第医院 | A plant dental structure |
| CN108451660B (en) * | 2018-04-18 | 2020-09-15 | 锦州医科大学附属第一医院 | Dental implant structure |
| WO2022062051A1 (en) * | 2020-09-23 | 2022-03-31 | 山东冠龙医疗用品有限公司 | Expandable anti-pullout pedicle screw |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104546106B (en) | 2016-07-13 |
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