CN109171921B - Novel design and manufacture of bone nail easy to screw in - Google Patents
Novel design and manufacture of bone nail easy to screw in Download PDFInfo
- Publication number
- CN109171921B CN109171921B CN201811200366.8A CN201811200366A CN109171921B CN 109171921 B CN109171921 B CN 109171921B CN 201811200366 A CN201811200366 A CN 201811200366A CN 109171921 B CN109171921 B CN 109171921B
- Authority
- CN
- China
- Prior art keywords
- screw
- nail
- bone
- expansion
- bone nail
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- A61B17/683—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut
-
- 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
- A61B17/866—Material or manufacture
-
- 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
- A61B2017/564—Methods for bone or joint treatment
Abstract
This patent discloses a novel easily twist bone nail to improve the not enough of current bone nail design. The bone nail of the invention consists of a screw rod, a nail seat, a nail tip and a thread with an auxetic effect. The expansion screw is characterized in that when the expansion screw is screwed into bone tissues, the expansion screw shrinks under pressure, and the easy screwing is realized. The expansion thread in the invention can design the structure type and size according to different clinical requirements, and adjust the thread strength, the anti-pull-out performance, the osseointegration capability and the expansion effect of the bone nail, so that the bone nail is easy to screw in, the pre-tightening force is high, and the bone ingrowth is promoted. The screw rod, the nail seat and the nail tip can be designed into a full-expansion structure, a solid structure and an expansion structure combined structure or a structure completely consistent with the existing bone nail in clinical practice according to the requirements on the expansion effect and strength of the bone nail in clinical application, and the design of controllable strength and pull-out resistance of the bone nail is realized. The bone nail can be manufactured with high precision by adopting additive manufacturing and material reduction manufacturing, can select a wide variety of materials, and has wide application prospect in the field of orthopedics.
Description
Technical Field
The invention is applied to the field of orthopedic medical instruments, and particularly relates to a novel bone nail easy to screw in.
Background
The bone nail is applied to the orthopaedics from the middle of the 19 th century, can be directly or jointly used for fixing broken injured bones, can be widely applied to the fixation of implants and bone tissues into a whole in the joint fusion operation, is also widely applied to the tooth loss and the orthodontics, and is a vital orthopedic medical instrument. However, the bone nail is difficult to screw, loosen and pull out in clinic, and the patient is not only exposed to the complications of infection, nonunion, skin necrosis, etc. of the affected part, but also suffers from great pain and high medical expense caused by secondary operation. How to improve the screwing performance and the in-vivo stability of the bone screw is always a great challenge. Therefore, it is necessary to design a bone nail which is easy to screw in and has better anti-pull-out performance.
The auxetic structure has a negative poisson's ratio effect. The deformation mode is different from the traditional structure, and the expansion is generated in the direction vertical to the stress direction when the elastic piece is stretched; when compressed, the compression is generated in the direction perpendicular to the force-bearing direction. The unique deformation mode of the auxetic structure enhances the mechanical property, the shear modulus, the fracture toughness, the fatigue durability and the like are higher, and the energy absorption and the shock absorption performance are better. The method has wide application prospect in the fields of aerospace, national defense, ship impact resistant naval vessel noise reduction and invisibility and biomedical engineering. But the complex configuration makes the preparation under controllable conditions very difficult, and restricts the development and application of the auxetic structure. With the rapid development of the additive manufacturing technology in recent years, the additive manufacturing technology can realize the precise manufacturing of any complex structure as a digitalized and direct manufacturing technology, so that the extensive application of the auxetic structure becomes possible.
The additive manufacturing technology is a rapid forming technology which takes a digital model file as a base, applies powdery materials and constructs an object in a layer-by-layer printing mode, can print out an implant with a complex shape and structure in one step when applied to orthopedics, and greatly promotes the multifunctional design and manufacture of the implant. However, the manufacturing precision of threads and other threads with tiny characteristic structures is general, and the model can be further processed in the material-reducing manufacturing process on the basis of the material-increasing manufacturing process, and the complex model can be manufactured with high precision by matching the material-reducing manufacturing process and the material-increasing manufacturing process.
Disclosure of Invention
The invention aims to solve the technical problem of designing a novel bone nail which is easy to screw in and resists to pull out. And carrying out structural design on the bone nail thread by utilizing the auxetic performance of the auxetic structure. When the bone nail is screwed into bone tissues, the thread with the stretching and expanding performance is compressed to shrink, so that the bone nail is easy to screw. After the screw is screwed in, the screw threads shrink to store certain energy, so that the pretightening force to the surrounding bone tissues is increased, and the anti-pulling-out capacity of the bone nail can be improved.
The technical scheme adopted by the invention is as follows: provides a bone nail which is easy to screw in, resists pull-out and promotes osseointegration. Consists of an expansion thread, a screw rod, a nail seat and a nail tip, as shown in figure 2. The screw thread with the auxetic structure can adjust the screw thread strength, the anti-pull-out performance, the osseointegration capability and the auxetic effect of the bone nail according to different clinical requirements and reasonable design sizes. The screw rod, the nail seat and the nail tip can be designed into a full-expansion structure, a combined structure of a solid structure and an expansion structure or a structure completely consistent with the existing clinical bone nail according to the requirements on the expansion effect and strength of the bone nail in clinical practical application. Additive manufacturing techniques can produce highly complex structures, but are still in a development stage, the manufacturing accuracy of small features is not yet fully satisfactory, and the application in the field of threaded bone screw manufacturing is limited. The bone nail with the auxetic threads can be manufactured into the bone nail with the internal nail body structure of the thread-free external auxetic structure by adopting the additive manufacturing technology, as shown in 1 in figure 3, and then the threads are cut out by material reduction manufacturing, so that the accurate solid forming of the bone nail with the auxetic threads is finally realized, as shown in 2 in figure 3.
The bone nail is made of metal, polymer and degradable medical material with good biocompatibility.
Has the advantages that: according to the invention, the expansion structure is introduced into the screw thread design of the bone nail, so that the bone nail has excellent easy screwing performance and good anti-pulling performance. The expansion thread is a porous structure, is beneficial to cell attachment and proliferation, induces bone ingrowth and osseointegration, and improves the internal fixation effect. At the same time, the auxetic thread has a long slot-like structure extending from the base to the tip, as shown in fig. 3 at 3, which provides a passage for an auxiliary agent, such as bone cement, to diffuse rapidly around the thread and fill the bone screw to enhance the fixation. The screw rod, the nail seat and the nail tip can be correspondingly designed according to the requirements on the bone nail pulling expansion effect and strength in clinical practical application, and the application range is wide in the orthopedic fixation.
Drawings
In fig. 1, 1 is a typical two-dimensional auxetic structure, 2 is a two-dimensional ring structure formed by the unit arrangement, 3 is a three-dimensional auxetic ring structure, and 4 is a three-dimensional auxetic thread.
Fig. 2 is a novel bone screw which is easy to screw in, resists extraction and promotes osseointegration. Wherein 1 is a nail seat, 2 is a screw rod, 3 is a porous expansion thread, and 4 is a nail tip. The 3-auxetic structure in fig. 2 includes other structures having a negative poisson's ratio effect. The type and size of the auxetic structure can be properly adjusted according to clinical requirements. In fig. 2, 1, 2 and 4 can be designed into a full-expansion structure, a combined structure of a solid structure and an expansion structure or a structure completely consistent with the existing bone nail in clinic according to the requirements on the expansion effect and strength of the bone nail in clinical practical application. The bone screw according to the invention, but also as a screw, is used in other fields.
Fig. 3 shows a bone screw 1 with an internal screw body structure without a thread and an external auxetic structure, a bone screw 2 with an auxetic thread, and a long groove-shaped structure in the thread 3.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Referring to fig. 1 and 2, the basic method for designing the novel easily screwed bone nail by using Pro/E software is as follows: (1) firstly, designing a two-dimensional ring expansion structure according to a selected unit; (2) stretching the two-dimensional ring auxetic structure into a three-dimensional ring auxetic structure; (3) performing thread cutting on the three-dimensional ring auxetic structure through a spiral cut command to obtain an auxetic thread; (4) the novel bone nail three-dimensional model which is easy to screw in and pull out is obtained by generating a stud, a nail seat and a nail tip through commands of stretching, rotating and the like.
Referring to fig. 3, in the manufacturing process of the bone nail with the auxetic threads, aiming at the small characteristic forming process of the threads, the bone nail with the external auxetic structure and the internal nail body structure without the threads is manufactured by adopting the additive manufacturing technology, then the threads are cut by reducing the material, and finally the solid forming of the bone nail with the auxetic threads is realized at high precision.
The bone nail structure disclosed by the invention is characterized in that the thread has a stretching and expanding effect, so that the aim of easily screwing the bone nail can be fulfilled. Screw rod, nail seat, nail point can be according to the demand to bone nail auxetic effect and intensity in clinical practical application, design into full auxetic structure, solid construction and auxetic structure integrated configuration or with present clinical bone nail completely consistent's structure, when realizing easily twist in, anti-extraction, promoting osseointegration, can design according to the location and the fixed of clinical demand to the intensity of bone nail, bone nail again. The thread with the auxetic structure can reasonably select the type and the size of the basic unit according to different clinical requirements to adjust the thread strength, the anti-pull-out performance, the osseointegration capability and the auxetic effect of the bone nail, so that the bone nail is easy to screw in, the pre-tightening force is high after the screw is screwed in, the porous thread promotes the surrounding bone tissue to grow in, and the perfect fusion of the human bone and the bone nail is achieved.
In the embodiment, when the bone nail is screwed into bone tissues, the thread with the stretching and expanding performance is compressed to shrink, so that the bone nail is easy to screw. After the screw is screwed in, the screw threads shrink to store certain energy, so that the pretightening force to the surrounding bone tissues is increased, and the anti-pulling-out capacity of the bone nail is improved. The porous auxetic thread is beneficial to cell attachment and proliferation, induces bone ingrowth and osseointegration, and improves the internal fixation effect. Meanwhile, the long-groove-shaped structure in the threads can provide a channel for the fixing auxiliary, so that the auxiliary can be rapidly diffused near the threads and can be filled around the bone nail to enhance the fixing effect, and the fixing device has a wide application prospect in the field of orthopedics.
Claims (7)
1. Novel easily twist bone nail, its characterized in that: the screw thread has an expansion effect, and the screw rod, the nail seat and the nail tip can be designed into a full expansion structure, a combined structure of a solid structure and an expansion structure or a structure completely consistent with the existing clinical bone nail according to the requirements on the expansion effect and strength of the bone nail in clinical practical application; the basic method for designing the novel easily screwed bone nail is as follows: (1) firstly, designing a two-dimensional ring expansion structure according to a selected unit, and arranging the two-dimensional ring expansion structure to form a two-dimensional ring structure; (2) stretching the two-dimensional ring auxetic structure into a three-dimensional ring auxetic structure; (3) carrying out spiral cutting on the three-dimensional ring auxetic structure through a spiral cut command to obtain an auxetic thread; (4) generating a stud, a nail seat and a nail tip through commands such as stretching, rotating and the like to obtain a novel bone nail three-dimensional model which is easy to screw in and pull out; the bone nail is manufactured into a bone nail with a thread-free external expansion structure and an internal nail body structure by adopting an additive manufacturing technology, then threads are cut by material reduction manufacturing, and finally accurate solid forming of the bone nail with the expansion threads is realized; the auxetic structure is provided with a long groove-shaped structure extending from the nail seat to the nail tip.
2. The new easy-to-screw bone screw of claim 1, characterized in that: the thread expansion structure shrinks under the action of pressure and is easy to screw in.
3. The new easy-to-screw bone screw of claim 1, characterized in that: after the screw is screwed in, the screw threads shrink to store certain energy, so that the pretightening force to the surrounding bone tissues is increased, and the anti-pulling-out capacity of the bone nail is improved.
4. The new easy-to-screw bone screw of claim 1, characterized in that: the screw thread is a porous structure to promote bone ingrowth, and the through long groove-shaped structure can provide a channel for a fixing auxiliary agent to enhance the bone nail fixing effect.
5. The new easy-to-screw bone screw of claim 1, characterized in that: the auxetic thread structure can reasonably design the type and the size of the basic unit according to clinical requirements to adjust the thread strength, the anti-pull-out performance, the osseointegration capability and the auxetic effect of the bone nail.
6. The new easy-to-screw bone screw of claim 1, characterized in that: the material range for manufacturing is wide, and metal, polymer and degradable material with good biocompatibility can be selected according to clinical requirements.
7. The new easy-to-screw bone screw of claim 1, characterized in that: the high-precision entity manufacturing can be realized by adopting an additive manufacturing process and a subtractive manufacturing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811200366.8A CN109171921B (en) | 2018-10-16 | 2018-10-16 | Novel design and manufacture of bone nail easy to screw in |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811200366.8A CN109171921B (en) | 2018-10-16 | 2018-10-16 | Novel design and manufacture of bone nail easy to screw in |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109171921A CN109171921A (en) | 2019-01-11 |
| CN109171921B true CN109171921B (en) | 2021-02-09 |
Family
ID=64945215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811200366.8A Active CN109171921B (en) | 2018-10-16 | 2018-10-16 | Novel design and manufacture of bone nail easy to screw in |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109171921B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529480B (en) * | 2019-09-30 | 2024-02-27 | 南京工业大学 | Multifunctional fastener with multiple negative poisson ratio effect and design method thereof |
| CN115635082A (en) * | 2022-10-12 | 2023-01-24 | 北京科技大学 | Degradable porous metal bone nail and additive manufacturing method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107898495A (en) * | 2017-07-24 | 2018-04-13 | 北京航空航天大学 | New resistance to plucking with auxetic performance goes out nail |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2667776C (en) * | 2006-11-17 | 2015-01-20 | Synthes Usa, Llc | Intramedullary nail including stable locking bolts |
| CN104095677B (en) * | 2014-07-15 | 2016-11-16 | 东南大学 | High-strength combination formula is from degrading expansion bone nail |
| CN204542473U (en) * | 2015-03-24 | 2015-08-12 | 中国兵器科学研究院宁波分院 | A kind of artificial spine intervertebral disk prosthesis |
| CN107981926B (en) * | 2017-09-20 | 2021-03-12 | 北京航空航天大学 | Pedicle screw with anti-pulling-out performance |
-
2018
- 2018-10-16 CN CN201811200366.8A patent/CN109171921B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107898495A (en) * | 2017-07-24 | 2018-04-13 | 北京航空航天大学 | New resistance to plucking with auxetic performance goes out nail |
Non-Patent Citations (1)
| Title |
|---|
| 负泊松比超材料研究进展;于靖军;《机械工程学报》;20180731;第52卷(第13期);1-14 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109171921A (en) | 2019-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204581484U (en) | A kind of 3D with three-dimensional through loose structure prints bone screw | |
| EP2078509A1 (en) | Dental implant | |
| CN107898495B (en) | Bone nail with auxetic structure | |
| CN109171921B (en) | Novel design and manufacture of bone nail easy to screw in | |
| US9579133B2 (en) | Internal fixation device | |
| CN104758042A (en) | Bone screw of three-dimensional through porous structure | |
| CN103393459B (en) | Locking jaw face rebuilding type bone-setting plate | |
| CN107981926B (en) | Pedicle screw with anti-pulling-out performance | |
| JP2018503492A (en) | Device for variable fixation of bone fragments | |
| CN109172051A (en) | Novel energy-absorbing damping acetabular cup | |
| CN201197743Y (en) | Anti-loose bone nail | |
| CN108309421B (en) | Internal plant mixing system and manufacturing method | |
| CN111407387A (en) | Screw assembly for bone fixation and bone fixation device | |
| CN201324284Y (en) | Proximal tibia lateral angulation fixed bone collecting plate | |
| CN103861156B (en) | A kind of bone anchoring device combined by degradable hone lamella and non-degradable nail | |
| CN213249621U (en) | Screw assembly for bone fixation and bone fixation device | |
| CN205019150U (en) | Pressurization intramedullary nail | |
| CN204484283U (en) | A kind ofly promote the bionical inner fixing device of the porous of union of fracture | |
| CN203634272U (en) | Sliding-groove vertebral plate forming titanium plate | |
| CN205411287U (en) | Self tapping type marrow internal fixation device suitable for long bone fracture | |
| CN215129869U (en) | Medical bone nail | |
| CN211985626U (en) | Orthopedic clinical compression kirschner wire | |
| CN201353191Y (en) | Inner-arc diaphysis-type dynamic-stress bone-fracture fixation steel plate | |
| CN210494715U (en) | Degradable porous iron-based bone fracture plate added with pore-forming agent | |
| CN208741107U (en) | A kind of metal bone screw |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |