CN111557725A - Bone screw with low damage and high holding force - Google Patents
Bone screw with low damage and high holding force Download PDFInfo
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- CN111557725A CN111557725A CN202010444803.1A CN202010444803A CN111557725A CN 111557725 A CN111557725 A CN 111557725A CN 202010444803 A CN202010444803 A CN 202010444803A CN 111557725 A CN111557725 A CN 111557725A
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- bone screw
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 46
- 230000006378 damage Effects 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 22
- 238000005452 bending Methods 0.000 claims abstract description 4
- 210000003128 head Anatomy 0.000 claims description 35
- 238000000227 grinding Methods 0.000 claims description 13
- 210000005077 saccule Anatomy 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims 2
- 208000027418 Wounds and injury Diseases 0.000 claims 1
- 208000014674 injury Diseases 0.000 claims 1
- 238000004080 punching Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 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
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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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
-
- 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
- A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
-
- 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
- A61B17/8695—Washers
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
- Surgical Instruments (AREA)
Abstract
A bone screw with low damage and high holding force comprises a nut head and a screw rod, wherein the screw rod is of a columnar hollow structure, the bottom end of the screw rod is provided with an opening, the nut head is provided with a groove, and the bottom surface of the groove is provided with a threaded through hole communicated with the inner cavity of the screw rod; the screw is inserted into the threaded through hole, and the top of the screw is in threaded fit with the threaded through hole; the diameter of the inner screw is 1/2-1/3 of the inner diameter of the cavity of the screw; the inner screw is of a hollow structure, and the conical head at the bottom end of the inner screw is composed of a plurality of metal strips which are fixedly connected end to end and separated at the middle. The bone screw has high holding force, can effectively resist bending and drawing stress, and has small damage to bones.
Description
Technical Field
The invention relates to a bone screw, in particular to a bone screw for fracture surgery.
Background
The bone screw is expected to be free of dislocation during the treatment period when in use, which requires the bone screw to have high holding force and good mechanical bending resistance and tensile resistance. Usually, the mechanical properties are all satisfactory. However, the key point is the holding force, and the performance of the holding force is directly related to the structure of the screw and the characteristics of the bone in which the screw is located. Generally, dislocation of the screw mostly occurs in the cancellous bone, if the thread pitch of the screw is small, the difference between the inner diameter and the outer diameter of the thread is small, so that the cancellous bone is easily broken or extruded and deformed by the thread in the cancellous bone, and the axial movement or circumferential rotation of the screw is easily generated instead of the stable embedded thread.
In order to obtain a high holding force, the screw thread is usually large, and the diameter of the screw is also large, so that the bone is greatly damaged by the screw. Therefore, how to obtain stable holding force with less damage becomes an important point in designing the bone screw.
Disclosure of Invention
The present invention aims to provide a bone screw with less damage and high holding power.
In order to achieve the purpose, the nut comprises a nut head and a screw rod, wherein the screw rod is of a cylindrical hollow structure, the bottom end of the screw rod is provided with an opening, the nut head is provided with a groove, and the bottom surface of the groove is provided with a threaded through hole communicated with the inner cavity of the screw rod;
the screw is inserted into the threaded through hole, and the top of the screw is in threaded fit with the threaded through hole;
the diameter of the inner screw is 1/2-1/3 of the inner diameter of the cavity of the screw;
the inner screw is of a hollow structure, and the conical head at the bottom end of the inner screw is composed of a plurality of metal strips which are fixedly connected end to end and separated at the middle.
Preferably, the wall thickness of the screw is 1/8-1/6 of the diameter of the screw, and the external diameter of the screw thread is 1/7-1/5 of the diameter of the screw;
preferably, the top thread pitch of the inner screw is 1/3-1/2 of the other part pitch.
Preferably, the inner screw is inserted into the screw at an inclination.
Preferably, the inner screw is coaxial with the screw.
Furthermore, the metal strip of the conical head is made of memory metal, and the maximum outer diameter of the conical head is larger than the diameter of the inner screw through bending deformation at 36 degrees.
The gasket further comprises a cylindrical cavity, the bottom of the cylindrical cavity is a bottom plate, a through hole for a screw to pass through is formed in the center of the cylindrical cavity, a plurality of uniformly distributed nail holes are formed in the bottom plate, straight nails are inserted into the nail holes, an outer ring and an inner ring are fixed on the bottom plate, the outer ring is tightly attached to the side wall of the cylindrical cavity and the bottom plate, the inner diameter of the inner ring is the same as the diameter of the through hole in the center of the bottom plate, the bottom wall of the inner ring is tightly attached to the upper surface of the bottom plate, annular metal sheets are fixed on the upper surfaces of the outer ring and the inner ring, the heights of the outer ring and the inner ring are within the range of 0.5-1mm, a screen is fixed on the outer ring and the inner ring, the thickness of the screen is 0.5-1mm, the nail holes correspond to screen holes of the screen, a vertically-.
Preferably, the central connecting line of the nail holes on the bottom plate is vertical to the axis of the bottom plate to form a group, 2-4 nail holes are arranged in each group, 4-8 groups are arranged, and the nail holes in each group are uniformly distributed at intervals along the axis of the bottom plate.
A spreader comprises a conduit with the bottom end communicated with a rubber ball, wherein the conduit can be inserted into an inner screw, and the rubber ball can be inserted into a conical head.
A grinding assembly comprises a core hole punching device and a core hole bottom grinding device, wherein the core hole punching device is used for drilling a drill string hole in a skeleton; the core hole bottom grinding device comprises a fixing rod, the fixing rod is hollow, the bottom end of the fixing rod is fixedly communicated with a saccule, the saccule is in an ellipsoid shape or a fusiform shape after being expanded, and a grinding sheet is fixed on the outer surface of the saccule.
The invention has the beneficial effects that:
1. the hollow screw rod can reduce the volume of punching holes on the skeleton and reduce the damage to the skeleton;
2. the fixed connection inner screw is added in the hollow screw, so that the holding force of the screw can be effectively improved;
3. the grinding device is matched, a cavity with the diameter larger than the outer diameter of the inner screw can be ground at the lower end of the inner screw, the opener is matched to open the conical head at the bottom end of the inner screw in the cavity, a fixing anchor is formed in a skeleton, and the integral anti-pulling capacity of the screw is effectively improved.
4. When the inner screw is obliquely inserted into the bone, the pulling resistance can be effectively improved.
5. The gasket is fixed by self is accomplished by a plurality of tiny straight nails, avoids dense bone or the bone bark breakage, and can effectively guarantee that the screw can not take place to rotate.
Drawings
Fig. 1 is a schematic view of a bone screw in a bone.
FIG. 2 is a schematic view of the structure of the ring hole punching device.
FIG. 3 is a schematic view of the bottom structure of the ring hole puncher.
FIG. 4 is a schematic view of a core hole drilling apparatus.
Fig. 5 is a schematic structural diagram of a core hole bottom grinding device.
Fig. 6 is a partially enlarged view of fig. 5.
Fig. 7 is a schematic structural view of the inner screw.
Fig. 8 is a partially enlarged view of fig. 7.
Fig. 9 is a schematic structural view of the inner screw in a bottom-end expanded state.
FIG. 10 is a schematic view of the inner screw bottom end spreader.
Fig. 11 is a schematic view of a gasket construction.
FIG. 12 is a schematic view of a gasket chassis configuration.
Fig. 13 is a partially enlarged view of fig. 11.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings. The materials used for the bone screw are all common metal materials used for producing the bone screw.
As shown in fig. 1 to 13, a bone screw 10 with low damage and high holding force comprises a nut head 11 and a screw 12, wherein the screw 12 is a cylindrical hollow structure with an open bottom end, and the wall thickness is preferably 1/8-1/6 of the diameter after test, and the external diameter of the screw 12 is 1/7-1/5 of the diameter of the screw 12;
a groove 13 is formed in the nut head 11, and a threaded through hole communicated with an inner cavity of the screw 12 is formed in the bottom surface of the groove 13;
the screw thread structure further comprises an inner screw 60, wherein the inner screw 60 penetrates through the threaded through hole, the top of the inner screw 60 is in threaded fit with the threaded through hole, and the thread pitch of the thread matched with the threaded through hole is 1/3-1/2 of the thread pitch of other parts;
the diameter of inner screw 60 is 1/2-1/3 of the inner diameter of the cavity of screw 12.
The positions of the inner screw 60 and the axis of the screw 12 are two, one is that the inner screw 60 is coaxial with the screw 12, and the other is that the inner screw 60 is obliquely inserted into the screw 12. The inclined insertion into the screw 12 is more advantageous in increasing the holding force.
As shown in fig. 9 and 10, in order to further improve the pulling resistance of the inner screw, the inner screw 60 is also provided with a hollow structure, the conical head 61 at the bottom end of the hollow structure is composed of a plurality of metal strips which are fixedly connected end to end and separated from each other in the middle. After the internal screw is screwed into a bone, the internal screw is inserted by using the spreader 70, the spreader 70 is a conduit with the bottom end communicated with a rubber ball, the rubber ball of the spreader 70 extends into the conical head of the internal screw 60 and then liquid is injected into the rubber ball or the rubber ball is blown up to spread the conical head 61, and the maximum diameter of the spread conical head is larger than the diameter of the internal screw 60.
The diameter of the conical head needs to be enlarged to clamp the column bone, so that the holding force is improved, therefore, the metal strip of the conical head can be made of memory metal and is bent and deformed at 36 degrees, and the maximum outer diameter of the conical head is larger than the diameter of the inner screw. In order to avoid the memory metal from deforming too early when being screwed into the bone, the spreader 70 can also be used as a cooling metal, the rubber ball of which is filled with cooling liquid, so that the temperature of the conical head 61 is always lower than 36 ℃, and when the inner screw is screwed to a preset position, the spreader is pulled out. When the conical head is heated by the temperature of the human body, the memory metal is naturally bent.
In order to avoid the cracking or damage of the cancellous bone caused by the expansion of the conical head 61, a core hole punching device 40 is needed for punching the mounting hole of the inner screw 60, and a core hole bottom grinding device 50 is added, and comprises a fixing rod, the fixing rod 50 is hollow, the bottom end of the fixing rod is fixedly communicated with the balloon 51, the balloon 51 is in an ellipsoid shape or a fusiform shape after being expanded, and the grinding sheet 52 is fixed on the outer surface of the balloon 51, as shown in fig. 6, the grinding sheet 52 is a metal grinding sheet, and preferably, the length direction of the grinding sheet is parallel to the axis of the balloon 51.
In order to avoid the rotation of the screw, a gasket 30 is sleeved at the bottom of the nut head 11, the gasket 30 comprises a cylindrical cavity, the bottom of the cylindrical cavity is a bottom plate 31, a through hole for the screw 12 to pass through is formed in the center of the cylindrical cavity, a plurality of uniformly distributed nail holes 32 are formed in the bottom plate 31, straight nails are inserted into the nail holes 32, an outer ring 311 and an inner ring 312 are fixed on the bottom plate 31, the outer ring is tightly attached to the side wall of the cylindrical cavity and the bottom plate 31, the inner diameter of the inner ring is the same as the diameter of the through hole in the center of the bottom plate 30, the bottom wall of the inner ring is tightly attached to the upper surface of the bottom plate 31, annular metal sheets 33 are fixed on the upper surfaces of the outer ring and the inner ring, the height of the outer ring and the height of the inner ring are within the. A screen 34 is fixed on the outer ring and the inner ring, the thickness of the screen 34 is 0.5-1mm, the nail holes 32 correspond to the screen holes of the screen 34, a vertically arranged sliding groove is formed in the inner side wall of the cylindrical cavity, and the lower end of the nut head 11 is fixed on a protrusion matched with the sliding groove. When the nut head 11 is screwed into the skeleton, the protrusion of the nut head is in the sliding groove to drive the gasket to rotate. The straight nail has not yet contacted the bone, and when the straight nail is screwed to the last circle, the straight nail starts to contact the bone, and because the surface of the bone is not flat, the straight nail close to the bone can be subjected to more pressure, and the pressure far from the bone is small. Because the metal sheet is very thin, the straight nail close to the skeleton can jack up the metal sheet, so that certain pressure can be buffered, and a fixing effect can be achieved.
The design is that the common gasket only has a circle of fixing nails at the outermost side, so that in order to ensure that the gasket has enough fixing force, the fixing nails of the gasket are relatively large, and the distance between the fixing nails and the screw fixing holes is relatively short, so that bones at the fixing positions of the fixing nails are easy to break, damage is caused, and meanwhile, the fixing force is weakened. Therefore, the central connecting line of the nail holes on the bottom plate 31 is vertical to the axis of the bottom plate to form a group, 2-4 nail holes are arranged in each group, 4-8 groups are arranged, and the nail holes in each group are uniformly distributed at intervals along the axis of the bottom plate 31.
In order to form a ring suitable for the screw 12, a ring punching device 20 is required, which has an outer diameter slightly smaller than the outer diameter of the screw, an inner diameter slightly larger than the inner diameter of the ring 12, and a crushing tooth at the bottom end.
When the internal screw 60 is to be screwed out after the bone is healed, the lower end of the conical head 61 of the internal screw can be pressed downwards by using a metal rod, so that the maximum diameter of the conical head is reduced, and the internal screw can be pulled out from the mounting hole of the internal screw 60. Of course, if the cone head is made of memory metal and is made of two-way memory metal, that is, there is one stable form above a certain temperature and another stable form below the certain temperature, the rubber ball of the spreader can be used to cool the cone head again to shrink the cone head.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A bone screw with low damage and high holding force comprises a nut head and a screw rod, and is characterized in that the screw rod is of a columnar hollow structure, the bottom end of the screw rod is provided with an opening, the nut head is provided with a groove, and the bottom surface of the groove is provided with a threaded through hole communicated with the inner cavity of the screw rod;
the screw is inserted into the threaded through hole, and the top of the screw is in threaded fit with the threaded through hole;
the diameter of the inner screw is 1/2-1/3 of the inner diameter of the cavity of the screw;
the inner screw is of a hollow structure, and the conical head at the bottom end of the inner screw is composed of a plurality of metal strips which are fixedly connected end to end and separated at the middle.
2. The bone screw with low damage and high holding force of claim 1, wherein the wall thickness of the screw is 1/8-1/6 of the diameter of the screw, and the outer diameter of the screw thread is 1/7-1/5 of the screw diameter.
3. The low damage, high grip bone screw of claim 1 wherein the top thread pitch of the inner screw is 1/3-1/2 of the other part pitch.
4. The low-damage high-holding-force bone screw according to claim 1, wherein the inner screw is inserted obliquely into the screw rod.
5. The low damage high grip bone screw of claim 1, wherein the inner screw is coaxial with the threaded rod.
6. The bone screw with low injury and high holding force of claim 1, wherein the metal strip of the conical head is made of memory metal, and the maximum outer diameter of the conical head is larger than the diameter of the inner screw by bending deformation at 36 degrees.
7. The low damage high grip bone screw of any one of claims 1-6, it is characterized in that the gasket comprises a cylindrical cavity, the bottom of the cylindrical cavity is a bottom plate, the center of the negative plate is provided with a through hole for the screw to pass through, the negative plate is provided with a plurality of nail holes which are uniformly distributed, straight nails are inserted in the nail holes, the negative plate is fixed with an outer ring and an inner ring, the outer ring is tightly attached to the side wall of the cylindrical cavity and the negative plate, the inner diameter of the inner ring is the same as the diameter of the central through hole of the negative plate, the bottom wall of the inner ring is tightly attached to the upper surface of the bottom plate, the upper surfaces of the outer ring and the inner ring are fixed with annular metal sheets, the height of the outer ring and the inner ring is within the range of 0.5-1mm, and a screen mesh is fixed on the outer ring and the inner ring, the thickness of the screen mesh is 0.5-1mm, the nail holes correspond to screen meshes of the screen mesh, a vertically arranged sliding groove is formed in the inner side wall of the cylindrical cavity, and the lower end of the nut head is fixed on a protrusion matched with the sliding groove.
8. The bone screw with low damage and high holding power of claim 7, wherein the center connecting line of the nail holes on the bottom plate is a group perpendicular to the axis of the bottom plate, 2-4 nail holes are arranged in each group, 4-8 groups are arranged, and the nail holes in each group are uniformly distributed at intervals along the axis of the bottom plate.
9. A distractor for fitting a bone screw according to claims 1-5 and 7-8, comprising a conduit with a bottom end communicating with a rubber ball, the conduit being insertable into the inner screw and the rubber ball being insertable into the conical head.
10. A milling assembly for cooperating with the bone screw of claims 1-8, comprising a core hole drilling means for drilling a drill string hole in the bone and a core hole bottom milling means; the core hole bottom grinding device comprises a fixing rod, the fixing rod is hollow, the bottom end of the fixing rod is fixedly communicated with a saccule, the saccule is in an ellipsoid shape or a fusiform shape after being expanded, and a grinding sheet is fixed on the outer wall of the saccule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010444803.1A CN111557725B (en) | 2020-05-23 | 2020-05-23 | Bone screw and perforating device with low damage and high holding force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010444803.1A CN111557725B (en) | 2020-05-23 | 2020-05-23 | Bone screw and perforating device with low damage and high holding force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111557725A true CN111557725A (en) | 2020-08-21 |
| CN111557725B CN111557725B (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010444803.1A Expired - Fee Related CN111557725B (en) | 2020-05-23 | 2020-05-23 | Bone screw and perforating device with low damage and high holding force |
Country Status (1)
| Country | Link |
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| CN (1) | CN111557725B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1085232A (en) * | 1996-09-19 | 1998-04-07 | Takiron Co Ltd | Washer for bone joint 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 |
| CN205322465U (en) * | 2015-12-01 | 2016-06-22 | 重庆医科大学附属永川医院 | A interior fixing system for lumbar vertebrae slippage resets |
| CN205339101U (en) * | 2015-12-29 | 2016-06-29 | 河南省洛阳正骨医院河南省骨科医院 | Special thighbone neck drive screw of children |
| CN105852950A (en) * | 2016-04-19 | 2016-08-17 | 青岛大学附属医院 | Hollow screw structure and usage thereof |
| CN209074846U (en) * | 2018-08-29 | 2019-07-09 | 贵州医科大学附属医院 | Odontoid fracture fixes device |
-
2020
- 2020-05-23 CN CN202010444803.1A patent/CN111557725B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1085232A (en) * | 1996-09-19 | 1998-04-07 | Takiron Co Ltd | Washer for bone joint 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 |
| CN205322465U (en) * | 2015-12-01 | 2016-06-22 | 重庆医科大学附属永川医院 | A interior fixing system for lumbar vertebrae slippage resets |
| CN205339101U (en) * | 2015-12-29 | 2016-06-29 | 河南省洛阳正骨医院河南省骨科医院 | Special thighbone neck drive screw of children |
| CN105852950A (en) * | 2016-04-19 | 2016-08-17 | 青岛大学附属医院 | Hollow screw structure and usage thereof |
| CN209074846U (en) * | 2018-08-29 | 2019-07-09 | 贵州医科大学附属医院 | Odontoid fracture fixes device |
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| Publication number | Publication date |
|---|---|
| CN111557725B (en) | 2022-03-22 |
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