CN111419377A - Carbon fiber pedicle screw and manufacturing method thereof - Google Patents
Carbon fiber pedicle screw and manufacturing method thereof Download PDFInfo
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- CN111419377A CN111419377A CN202010233407.4A CN202010233407A CN111419377A CN 111419377 A CN111419377 A CN 111419377A CN 202010233407 A CN202010233407 A CN 202010233407A CN 111419377 A CN111419377 A CN 111419377A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
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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
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
- A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
- A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/02—Inorganic materials
- A61L31/022—Metals or alloys
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/02—Inorganic materials
- A61L31/024—Carbon; Graphite
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/04—Macromolecular materials
- A61L31/06—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L31/18—Materials at least partially X-ray or laser opaque
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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
- A61B2017/00526—Methods of manufacturing
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Abstract
A carbon fiber pedicle screw and a manufacturing method thereof are provided, wherein a screw body and a screw cap are made of carbon fiber composite polyether ether ketone materials, a screw positioning needle is arranged in the screw body and is arranged along the axial direction of the screw body, a screw cap positioning needle is arranged in the screw cap, the screw cap positioning needle is arranged in a radial plane of the screw cap, and the arrangement direction of the screw positioning needle is mutually perpendicular to the arrangement direction of the screw cap positioning needle. Through material modification, the modulus of the bone nail material is close to the modulus of a skeleton, and the problems of stress shielding and secondary fracture induction are solved; for different types of patients, the material modulus is adjusted by adjusting the carbon fiber content, and different corresponding screw customizations are further carried out according to the conditions of the patients; the tantalum needle which is easy to form X-ray images is implanted in the screw body and the screw cap to be used as imaging and positioning materials, so that the state monitoring of the pedicle screw during and after an operation is facilitated, and the tantalum needle which is vertical to each other in the screw body and the screw cap can be more conveniently and visually positioned in three dimensions.
Description
Technical Field
The invention relates to the technical field of medical implants, in particular to a carbon fiber pedicle screw and a manufacturing method thereof.
Background
The spine degenerative disease is a common disease in spine surgery, once diagnosed, the disease should be treated by an operation as soon as possible, one of the classic operative modes is intervertebral disc excision bone grafting fusion, on one hand, nerve compression is directly relieved by excision of a diseased intervertebral disc, and on the other hand, intervertebral fusion is achieved by fixation implantation in a vertebral pedicle after the intervertebral disc is excised and intervertebral bone grafting, and spinal cord compression and local pain caused by intervertebral motion of a vertebral body are eliminated. At present, the success of the operation is considered to be finally determined by the stability and holding force of the internal fixation and whether the intervertebral bone graft can obtain good osseous fusion. Whether good osseous fusion can be obtained or not, the strength and material properties of the internal fixation are important factors. Too high internal fixation strength may cause secondary fracture of the implant region, while too low strength may cause internal fixation failure or damage. In addition, the final fusion effect is also affected by the high and low elastic modulus of the internal fixation material, the too high elastic modulus can form false joints to achieve osseous fusion, and in addition, the symptoms of continuous pain, infection, bleeding and the like of an implantation area of an individual patient caused by the problems of the histocompatibility of the material or the properties of the material can also occur. Therefore, how to improve the bone fusion rate after internal fixation is a problem which is urgently hoped to be solved by the spine surgeon at present. At present, the traditional internal fixation material is titanium alloy or Polyetheretherketone (PEEK) material for batch production. Although the internal fixation strength and the bone fusion rate are greatly improved through multiple improvements, the incidence rate of the bone grafting interface pseudo joint is still 10% -20%, even 60% is reported. This is closely related to the strength, elastic modulus and osteogenic activity of the implant material itself. And the carbon fiber and the PEEK are used as materials with good human tissue compatibility, so that the material has higher strength and is easier to induce osteogenesis. Therefore, the design and production of the pedicle screw using carbon fiber as the main raw material to achieve the purposes of maintaining intervertebral stability, improving local osteogenesis, increasing withdrawal resistance and reducing complications becomes a difficult problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a needle-type locking bone fracture plate nail system structure for distal radius fracture.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
the carbon fiber pedicle screw comprises a screw body and a screw cap, wherein the screw cap is arranged in the upper end of the screw body in a threaded fit manner and fixes a connecting rod penetrating through the screw body, the screw body and the screw cap are made of carbon fiber composite polyether-ether-ketone materials, a screw positioning needle is arranged in the screw body and arranged along the axial direction of the screw body, a screw cap positioning needle is arranged in the screw cap, the screw cap positioning needle is arranged in a radial plane of the screw cap, and the arrangement direction of the screw positioning needle is perpendicular to the arrangement direction of the screw cap positioning needle.
The invention can also adopt the following technical measures:
the screw positioning pin and the screw body are coaxially arranged.
The screw positioning needle and the screw positioning needle are made of tantalum.
The weight ratio of the carbon fiber to the polyether-ether-ketone in the materials of the screw body and the screw cap is 10:100 to 40: 100.
For osteoporosis patients, the weight percentage of carbon fiber in the screw body and the screw cap is 10-20%; for normal young and old bone patients, the weight percentage of the carbon fibers in the screw body and the screw cap is 20-30%.
The manufacturing method of the carbon fiber pedicle screw comprises the following steps:
A. the preparation method comprises the following steps of (1) taking chopped carbon fibers and polyether-ether-ketone powder as raw materials, wherein the weight ratio of the carbon fibers to the polyether-ether-ketone is 10: 100-40: 100, and carrying out extrusion granulation in a double-screw granulator to obtain carbon fiber reinforced polyether-ether-ketone material granules;
B. performing injection molding on the granules by using an injection molding machine to obtain a screw body with a reserved needle hole, wherein the reserved direction of the needle hole is parallel to the axial direction of the screw body, and the needle hole is positioned in the center of the screw;
C. embedding a screw positioning pin made of tantalum into a pin hole of a screw body;
D. and D, performing injection molding on the granules obtained in the step B through an injection molding machine, and embedding a nail cap positioning needle made of tantalum in the injection molding process, wherein the nail cap positioning needle is arranged in a radial plane of the nail cap and is vertical to the axial direction of the nail cap.
The invention has the advantages and positive effects that:
according to the carbon fiber pedicle screw and the manufacturing method thereof, the screw body and the screw cap are made of carbon fiber composite polyether ether ketone materials, and the modulus of a bone screw material is close to the modulus of a skeleton through material modification, so that the problems of stress shielding and secondary fracture induction are solved; for different types of patients, the material modulus is adjusted by adjusting the carbon fiber content, and different corresponding screw customizations are further carried out according to the conditions of the patients; the tantalum needle which is easy to form X-ray images is implanted in the screw body and the screw cap to be used as imaging and positioning materials, so that the state monitoring of the pedicle screw during and after an operation is facilitated, and the tantalum needle which is vertical to each other in the screw body and the screw cap can be more conveniently and visually positioned in three dimensions.
Drawings
FIG. 1 is an external view of the carbon fiber pedicle screw of the present invention.
Detailed Description
The technical solution of the present invention is explained in detail by the accompanying drawings and the specific embodiments.
As shown in fig. 1, the carbon fiber pedicle screw of the invention comprises a screw body 1 and a screw cap 2, wherein the screw cap is arranged inside the upper end of the screw body through thread fit and fixes a connecting rod penetrating through the screw body, the screw body and the screw cap are made of carbon fiber composite polyether ether ketone materials, a screw positioning needle 3 is arranged in the screw body and is arranged along the axial direction of the screw body, a screw cap positioning needle 4 is arranged in the screw cap, the screw cap positioning needle is arranged in a radial plane of the screw cap, and the arrangement direction of the screw positioning needle is perpendicular to the arrangement direction of the screw cap positioning needle.
The screw positioning needle and the screw body are coaxially arranged, the screw cap positioning needle and the screw body are axially and vertically arranged, and the screw positioning needle are made of a tantalum material which is easy to image under X-rays, so that the imaging and positioning can be visually and clearly carried out under the X-rays.
The weight ratio of the carbon fiber to the polyether-ether-ketone in the materials of the screw body and the screw cap is 10:100 to 40: 100.
For osteoporosis patients, the weight percentage of carbon fiber in the screw body and the screw cap is 10-20%; for normal young and old bone patients, the weight percentage of the carbon fibers in the screw body and the screw cap is 20-30%.
The manufacturing method of the carbon fiber pedicle screw comprises the following steps:
A. the preparation method comprises the following steps of (1) taking chopped carbon fibers and polyether-ether-ketone powder as raw materials, wherein the weight ratio of the carbon fibers to the polyether-ether-ketone is 10: 100-40: 100, and carrying out extrusion granulation in a double-screw granulator to obtain carbon fiber reinforced polyether-ether-ketone material granules;
B. performing injection molding on the granules by using an injection molding machine to obtain a screw body with a reserved needle hole, wherein the reserved direction of the needle hole is parallel to the axial direction of the screw body, and the needle hole is positioned in the center of the screw;
C. embedding a screw positioning pin made of tantalum into a pin hole of a screw body;
D. and D, performing injection molding on the granules obtained in the step B through an injection molding machine, and embedding a nail cap positioning needle made of tantalum in the injection molding process, wherein the nail cap positioning needle is arranged in a radial plane of the nail cap and is vertical to the axial direction of the nail cap.
The manufacturing method of the carbon fiber pedicle screw of the invention can adopt the following embodiments:
example 1, medical grade paddle-free chopped carbon fibers (0.1 kg/min) were added into a medical grade polyetheretherketone (feeding speed 1 kg/min) granulation twin-screw through a side feeding port to granulate, to obtain carbon fiber reinforced polyetheretherketone granules, which are denoted as P1; the injection molded bars tested for P1 and had a modulus of 5.2GPa.
Example 2, adding medical grade paddle-free chopped carbon fibers (0.2 kg/min) into a medical grade polyetheretherketone (feeding speed 1 kg/min) granulation twin-screw through a side feeding port for granulation to obtain carbon fiber reinforced polyetheretherketone granules, which are marked as P2; the injection molded bars tested for P2 and had a modulus of 7.2GPa.
Example 3, medical grade paddle-free chopped carbon fibers (0.3 kg/min) were added to a medical grade polyetheretherketone (feed rate 1 kg/min) granulation twin-screw through a side feed port for granulation to obtain carbon fiber reinforced polyetheretherketone pellets, which are denoted as P3; the injection molded bars tested for P3 and had a modulus of 9.6GPa.
Example 4, medical grade paddle-free chopped carbon fibers (0.4 kg/min) were added to a medical grade polyetheretherketone (feed rate 1 kg/min) granulation twin-screw through a side feed port for granulation to obtain carbon fiber reinforced polyetheretherketone pellets, which are denoted as P4; the injection molded bars tested for P4 and had a modulus of 12.7GPa.
In example 5, a nail head with a tantalum needle embedded therein was obtained as M4 by injection molding from P4.
In example 6, a P1 raw material was used to perform injection molding to obtain a screw with a reserved pinhole having a diameter of 1.75 mm, a 1.7 mm tantalum nail was inserted into the pinhole, and a 1.75 mm medical-grade peek wire was used to block the pinhole, and the obtained screw was designated as T1.
In example 7, a P2 raw material was used to perform injection molding to obtain a screw with a reserved pinhole having a diameter of 1.75 mm, a 1.7 mm tantalum nail was inserted into the pinhole, and a 1.75 mm medical-grade peek wire was used to block the pinhole, and the obtained screw was designated as T2.
In example 8, a P3 raw material was used to perform injection molding to obtain a screw with a reserved pinhole having a diameter of 1.75 mm, a 1.7 mm tantalum nail was inserted into the pinhole, and the pinhole was sealed with a 1.75 mm medical PEEK wire, and the obtained screw was designated as T3.
In example 9, a P4 material was used to perform injection molding to obtain a screw with a pin hole having a diameter of 1.75 mm, a 1.7 mm tantalum nail was inserted into the pin hole, and the pin hole was sealed with a 1.75 mm medical PEEK wire, and the obtained screw was designated as T4.
T1 and M4 can be used as screw caps for infants.
T2 and M4 can be used as screw caps for osteoporosis patients.
T3 and M4 can be used as screw caps for elderly patients.
T2 and M4 can be used as screw caps for young adults.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a carbon fiber pedicle of vertebral arch screw, includes screw body and head of a nail, and the head of a nail passes through screw-thread fit and sets up inside the upper end of screw body, and the connecting rod that will pass the screw body is fixed its characterized in that: the screw body and the screw cap are made of carbon fiber composite polyether ether ketone materials, the screw body is internally provided with a screw positioning needle, the screw positioning needle is arranged along the axial direction of the screw body, the screw cap positioning needle is arranged in the screw cap, the screw cap positioning needle is arranged in the radial plane of the screw cap, and the setting direction of the screw positioning needle is mutually perpendicular to the setting direction of the screw cap positioning needle.
2. The carbon fiber pedicle screw as claimed in claim 1, wherein: the screw positioning pin is coaxially arranged with the screw body.
3. The carbon fiber pedicle screw as claimed in claim 1 or 2, wherein: the screw positioning needle and the screw positioning needle are made of tantalum.
4. The carbon fiber pedicle screw as claimed in claim 3, wherein: the weight ratio of the carbon fiber to the polyether-ether-ketone in the materials of the screw body and the screw cap is 10:100 to 40: 100.
5. The carbon fiber pedicle screw as claimed in claim 4, wherein: for osteoporosis patients, the weight percentage of carbon fiber in the screw body and the screw cap is 10-20%; for normal young and old bone patients, the weight percentage of the carbon fibers in the screw body and the screw cap is 20-30%.
6. A method of making the carbon fiber pedicle screw of claim 1, comprising the steps of:
A. the preparation method comprises the following steps of (1) taking chopped carbon fibers and polyether-ether-ketone powder as raw materials, wherein the weight ratio of the carbon fibers to the polyether-ether-ketone is 10: 100-40: 100, and carrying out extrusion granulation in a double-screw granulator to obtain carbon fiber reinforced polyether-ether-ketone material granules;
B. performing injection molding on the granules by using an injection molding machine to obtain a screw body with a reserved needle hole, wherein the reserved direction of the needle hole is parallel to the axial direction of the screw body, and the needle hole is positioned in the center of the screw;
C. embedding a screw positioning pin made of tantalum into a pin hole of a screw body;
D. and D, performing injection molding on the granules obtained in the step B through an injection molding machine, and embedding a nail cap positioning needle made of tantalum in the injection molding process, wherein the nail cap positioning needle is arranged in a radial plane of the nail cap and is vertical to the axial direction of the nail cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010233407.4A CN111419377A (en) | 2020-03-29 | 2020-03-29 | Carbon fiber pedicle screw and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010233407.4A CN111419377A (en) | 2020-03-29 | 2020-03-29 | Carbon fiber pedicle screw and manufacturing method thereof |
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| CN111419377A true CN111419377A (en) | 2020-07-17 |
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| CN202010233407.4A Pending CN111419377A (en) | 2020-03-29 | 2020-03-29 | Carbon fiber pedicle screw and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112606456A (en) * | 2020-12-07 | 2021-04-06 | 张家港市友成高新材料有限公司 | Processing technology for adjustable extension joint of external fixing bracket for orthopedics department |
| CN113209389A (en) * | 2021-03-18 | 2021-08-06 | 龙甲（上海）实业有限公司 | Medical orthopedic bone nail and preparation method thereof |
| CN116533550A (en) * | 2023-03-16 | 2023-08-04 | 常州集硕医疗器械有限公司 | Machining process of cone forming screw based on carbon fiber reinforced polyether-ether-ketone material |
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| CN1582860A (en) * | 2003-08-20 | 2005-02-23 | 中国科学院金属研究所 | Carbon fiber inforced poly(ether-ether-ketone) composite bone fracture plate |
| CN202821580U (en) * | 2012-08-02 | 2013-03-27 | 天津市威曼生物材料有限公司 | Novel U-type pedicle screw |
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| CN105682583A (en) * | 2013-09-01 | 2016-06-15 | 碳固定骨科有限公司 | Composite material spinal implant |
| CN110193926A (en) * | 2019-05-08 | 2019-09-03 | 西安交通大学 | A kind of design and manufacturing method of the bionical multi-level joint prosthesis of polyether-ether-ketone |
| CN110835807A (en) * | 2019-11-29 | 2020-02-25 | 吉林大学 | Carbon fiber reinforced polyether-ether-ketone fiber composite material and preparation method and application thereof |
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2020
- 2020-03-29 CN CN202010233407.4A patent/CN111419377A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1582860A (en) * | 2003-08-20 | 2005-02-23 | 中国科学院金属研究所 | Carbon fiber inforced poly(ether-ether-ketone) composite bone fracture plate |
| CN202821580U (en) * | 2012-08-02 | 2013-03-27 | 天津市威曼生物材料有限公司 | Novel U-type pedicle screw |
| CN105682583A (en) * | 2013-09-01 | 2016-06-15 | 碳固定骨科有限公司 | Composite material spinal implant |
| CN205215458U (en) * | 2015-12-09 | 2016-05-11 | 胡桓宇 | Zero notch of side approach fuses ware |
| CN110193926A (en) * | 2019-05-08 | 2019-09-03 | 西安交通大学 | A kind of design and manufacturing method of the bionical multi-level joint prosthesis of polyether-ether-ketone |
| CN110835807A (en) * | 2019-11-29 | 2020-02-25 | 吉林大学 | Carbon fiber reinforced polyether-ether-ketone fiber composite material and preparation method and application thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112606456A (en) * | 2020-12-07 | 2021-04-06 | 张家港市友成高新材料有限公司 | Processing technology for adjustable extension joint of external fixing bracket for orthopedics department |
| CN112606456B (en) * | 2020-12-07 | 2023-05-23 | 张家港市友成高新材料有限公司 | Processing technology of adjustable extension joint of external fixing support for orthopaedics |
| CN113209389A (en) * | 2021-03-18 | 2021-08-06 | 龙甲（上海）实业有限公司 | Medical orthopedic bone nail and preparation method thereof |
| CN116533550A (en) * | 2023-03-16 | 2023-08-04 | 常州集硕医疗器械有限公司 | Machining process of cone forming screw based on carbon fiber reinforced polyether-ether-ketone material |
| CN116533550B (en) * | 2023-03-16 | 2023-10-24 | 常州集硕医疗器械有限公司 | Machining process of cone forming screw based on carbon fiber reinforced polyether-ether-ketone material |
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Application publication date: 20200717 |