CN110974387A - A Novel Support Compression Screw for Femoral Neck Fractures - Google Patents
A Novel Support Compression Screw for Femoral Neck Fractures Download PDFInfo
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- CN110974387A CN110974387A CN201911340606.9A CN201911340606A CN110974387A CN 110974387 A CN110974387 A CN 110974387A CN 201911340606 A CN201911340606 A CN 201911340606A CN 110974387 A CN110974387 A CN 110974387A
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- screw
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- femoral neck
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- 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
- 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 or setting implements
- 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
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B2017/564—Methods for bone or joint treatment
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
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- Engineering & Computer Science (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
本发明提供一种用于股骨颈骨折的新型支撑加压螺钉，包括螺钉本体，螺钉本体为中空结构，螺钉本体钉头端外表面设有第一螺纹，螺钉本体钉尾端外表面设有第二螺纹，第一螺纹方向与第二螺纹方向相反，螺钉本体钉尾端设有切削面，用以贴合骨干部。本发明通过在螺钉本体的钉头端和钉尾端设置方向相反的螺纹，增加了把持力，钉尾端切削处理后，在螺钉本体旋入股骨颈时，钉尾端仍有螺纹与皮质锚合，增强了把持力；同时切削面也紧贴骨面，减少了内固定物突出引起的不适。与骨干部皮质紧贴，减少了激惹。
The invention provides a new type of support and compression screw for femoral neck fracture, comprising a screw body, the screw body is a hollow structure, the outer surface of the head end of the screw body is provided with a first thread, and the outer surface of the tail end of the screw body is provided with a second thread. Two threads, the direction of the first thread is opposite to the direction of the second thread, and the tail end of the screw body is provided with a cutting surface to fit the backbone. The invention increases the holding force by arranging opposite threads on the screw head end and the screw tail end of the screw body. After the screw tail end is cut, when the screw body is screwed into the femoral neck, there are still threads and cortical anchors at the screw tail end. At the same time, the cutting surface is also close to the bone surface, which reduces the discomfort caused by the protrusion of the internal fixator. Close to the cortex of the skeleton, reducing irritation.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a novel supporting compression screw for femoral neck fracture.
Background
The incision reduction internal fixation is an effective mode for treating femoral neck fracture, and the fracture part can be fixed by using a screw alone or by using a steel plate and the screw in a combined mode in the operation. The traditional treatment method is to fix the bone with a half-thread hollow tension screw (hereinafter referred to as screw). Three or four screws are arranged in the femoral neck in a regular triangle or reverse triangle shape, the length of each screw is 75-110 mm, the screws are screwed in and slide and press by means of a smooth screw rod at the tail end, and the screw cap is fixed at the metaphysis and irritates the skin to a certain extent. Because the screw rod part of the hollow lag screw has no screw thread, the screw withdrawing phenomenon is easily generated in the healing process of the femoral neck at the later stage, so that the holding force is reduced, and simultaneously, the protrusion of the internal fixture easily causes pain of a patient.
The above-described screws are widely used in fracture fixation at the present stage, and the compression fixation of screws is regarded as an absolutely stable fixation method. The principle of realizing fracture pressurization is as follows: the guide pin is firstly used for temporarily fixing the reset fracture block, and the screw can penetrate through the guide pin for temporarily fixing the fracture block through near-end reaming, so that the pressurization between the fracture blocks is realized. For this purpose, the screw is designed to be hollow inside, the proximal end of the screw is designed to be smooth rod-shaped, the tip of the screw is designed to be thread, and pressurization is formed by means of the diameter difference of the screw rod and the thread.
In most fracture fixation, the compression hollow screw plays a perfect role. However, problems arise when such screws are used for femoral neck fractures. This is because fixation of femoral neck fractures not only requires perfect reduction compression, but also more effective support during the healing process. Because the proximal cancellous bone of the femur has a large proportion, the counterforce at the anchoring part at one end is reduced when the common compression screw is screwed in. It is difficult to provide effective support.
Foreign scholars recently proposed a more practical solution, namely, a hollow bolt is changed into a solid bolt, so that the external force resistance of the bolt is improved. However, the middle section of the solid bolt is a weak link, the weak link is easy to break after a certain torque is achieved, and the later period still needs to be verified for many times to check whether the scheme is feasible or not. Also, the design of the nut, despite the low profile treatment, can create skin irritation for small persons or result in the need to remove the screw for the second time.
For avoiding the nut to irritate, can be the taper thread with the design of screw both ends, middle polished rod slides, relies on the pitch production when screwing in to pressurize, and the tail end flushes with cortex contact department, has avoided skin to irritate, but has lost the supporting role simultaneously.
Disclosure of Invention
The invention aims to provide a compression screw, in particular to a novel supporting compression screw which is specially applied to femoral neck fracture, has simple structure and convenient operation, has two-way thread design at two ends of the screw, has large supporting force, and effectively avoids irritation due to cutting treatment of the tail end of the screw.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a novel support compression screw for femoral neck fracture, includes the screw body, the screw body is hollow structure, screw body pin fin end surface is equipped with first screw thread, screw body nail tail end surface is equipped with the second screw thread, first screw thread direction with second screw thread opposite direction, screw body nail tail end is equipped with the cutting face for the cadre of laminating.
Further, a cutting angle is arranged between the cutting surface and the central axis of the screw body, and the acute angle of the cutting angle is 45-55 degrees.
Further, the acute angle of the cutting angle is 50 °.
Further, the first thread is a forward thread, and the second thread is a reverse thread.
Further, the first thread pitch is different from the second thread pitch.
Further, the first thread pitch is greater than the second thread pitch.
Further, the first thread pitch is 1.75mm, and the second thread pitch is 1.45 mm.
Furthermore, a cavity is arranged on the central axis of the screw body, and the cross section of the cavity is in a regular hexagonal shape.
Furthermore, a screw rod is arranged between the screw head end of the screw body and the screw tail end of the screw body, and the outer surface of the screw rod is subjected to smooth treatment.
Further, the total length of the screw body is 75mm-110 mm.
The invention has the advantages and positive effects that:
1. the screw head end and the screw tail end of the screw body are provided with the threads in opposite directions, so that the holding force is increased, and after the screw tail end is cut, the screw tail end is anchored with the cortex by the threads when the screw body is screwed into the femoral neck, so that the holding force is enhanced; meanwhile, the cutting surface is tightly attached to the bone surface, so that discomfort caused by protrusion of an internal fixture is reduced. Closely attached to the cortex of the diaphysis, and irritation is reduced.
2. The screw head end is designed into the forward thread, the forward thread at the screw head end is beneficial to screwing and fixing the screw body, the screw tail end is designed into the reverse thread, and the reverse thread at the screw tail end increases the holding force to avoid withdrawing the screw.
3. The screw pitch size of the nail head end is larger than that of the nail tail end, and the screw pitch of the screw thread of the nail head end is large, so that effective pressurization can be realized; the screw thread pitch of the nail tail end is relatively small, and the nail tail end is in a reverse screw thread design and plays a supporting role.
4. The cross section of the cavity in the screw body is in the shape of a regular hexagon, so that the screw body can be conveniently matched with the existing tool, no additional tool is needed, the utilization rate is high, the practicability is high, and the popularization and the application are convenient.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic structural view of the tail end of the nail according to the embodiment of the invention.
FIG. 3 is a schematic view of a nail head structure according to an embodiment of the present invention.
Fig. 4 is a schematic view of a cutting angle structure according to an embodiment of the present invention.
In the figure:
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in fig. 1, a novel supporting compression screw for femoral neck fracture comprises a screw body 8, wherein the screw body 8 is of a hollow structure, a first thread 6 is arranged on the outer surface of a head end 5 of the screw body 8, a second thread 2 is arranged on the outer surface of a tail end 3 of the screw body 8, the direction of the first thread 6 is opposite to that of the second thread 2, and a cutting surface 1 is arranged at the tail end 3 of the screw body 8 for being attached to a bone trunk.
According to the embodiment, the screw threads in opposite directions are arranged at the nail head end 5 and the nail tail end 3 of the screw body 8, the holding force is increased, after the nail tail end 3 is cut, when the screw body 8 is screwed into a femoral neck, the nail tail end 3 still has the screw threads anchored with cortex, the holding force is enhanced, meanwhile, the cutting surface 1 is tightly attached to the bone surface, and discomfort caused by protrusion of an internal fixture is reduced. Closely attached to the cortex of the diaphysis, and irritation is reduced.
Preferably, as shown in fig. 2 and 3, the first thread 6 in this embodiment is a forward thread, the second thread 2 is a reverse thread, the forward thread of the nail head end 5 facilitates the screw body 8 to be screwed in and fixed, and the reverse thread of the nail tail end 3 increases the holding force to prevent the nail from being removed.
The first thread 6 has a different pitch than the second thread 2. The first thread 6 in this embodiment has a larger pitch than the second thread 2. Specifically, the pitch of the first thread 6 is 1.75mm, and the pitch of the second thread 2 is 1.45 mm. The screw pitch size of the nail head end 5 is larger than that of the nail tail end 3, and the screw pitch of the screw thread of the nail head end 5 is large, so that effective pressurization can be realized; the screw thread pitch of the nail tail end 3 is relatively small, and the nail tail end is designed into a reverse screw thread and plays a supporting role.
As shown in fig. 4, a cutting angle 9 is provided between the cutting surface 1 and the central axis of the screw body 8, and an acute angle of the cutting angle 9 is 45 ° to 55 °, and preferably, an acute angle of the cutting angle 9 in this embodiment is 50 °. This angle is favorable to cutting face 1 to flush with the cortex contact department, avoids the skin to irritate, prevents the nail of getting for the second time.
Specifically, the screw body 8 is a cylinder, the screw rod 4 is arranged between the head end 5 of the screw body 8 and the tail end 3 of the screw body 8, the outer surface of the screw rod 4 is subjected to smooth treatment, and the total length of the screw body 8 is 75mm-110 mm. A cavity 7 is arranged on the central axis of the screw body 8, and the section of the cavity 7 is regular hexahedron. The screw body 8 is designed to be hollow inside, the middle section of the screw body 8 is in a smooth rod shape, the two ends are designed to be threads, and pressurization is formed by the difference of the diameters of the threads at the screw rod 4 and the two ends, so that the fixing effect is enhanced. The cross-section of the cavity 7 in the screw body 8 is regular hexagon, so that the screw is convenient to match with the existing tool, no additional matching tool is needed, the utilization rate is high, the practicability is high, and the screw is convenient to popularize and apply.
The working principle of the invention is as follows:
the fracture block that resets is fixed temporarily with the guide pin earlier, makes screw body 8 pass the guide pin of fixed fracture block temporarily through near-end reaming, realizes the pressurization between the fracture block. The cavity 7 of the tail end 3 of the nail of the screw body 8 is connected through tools such as a hexagon socket wrench and the like, and the whole screw body 8 is screwed in until the cutting surface 1 of the tail end 3 of the nail is attached to the backbone part. The screw body 8 is designed to be of a hollow structure, the screw rod 4 in the middle of the screw body 8 is of a smooth rod shape, the nail head end 5 is designed to be a forward thread, and pressurization is formed by the difference of the diameters of the screw rod 4 and the forward thread. The nail tail end 3 is reverse screw thread, has increased the power of controlling and has avoided moving back the nail.
The invention has the advantages and positive effects that:
1. the screw head end and the screw tail end of the screw body are provided with the threads in opposite directions, so that the holding force is increased, and after the screw tail end is cut, the screw tail end is anchored with the cortex by the threads when the screw body is screwed into the femoral neck, so that the holding force is enhanced; meanwhile, the cutting surface is tightly attached to the bone surface, so that discomfort caused by protrusion of an internal fixture is reduced. Closely attached to the cortex of the diaphysis, and irritation is reduced.
2. The screw head end is designed into the forward thread, the forward thread at the screw head end is beneficial to screwing and fixing the screw body, the screw tail end is designed into the reverse thread, and the reverse thread at the screw tail end increases the holding force to avoid withdrawing the screw.
3. The screw pitch size of the nail head end is larger than that of the nail tail end, and the screw pitch of the screw thread of the nail head end is large, so that effective pressurization can be realized; the screw thread pitch of the nail tail end is relatively small, and the nail tail end is in a reverse screw thread design and plays a supporting role.
4. The cross section of the cavity in the screw body is in the shape of a regular hexagon, so that the screw body can be conveniently matched with the existing tool, no additional tool is needed, the utilization rate is high, the practicability is high, and the popularization and the application are convenient.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911340606.9A CN110974387A (en) | 2019-12-23 | 2019-12-23 | A Novel Support Compression Screw for Femoral Neck Fractures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911340606.9A CN110974387A (en) | 2019-12-23 | 2019-12-23 | A Novel Support Compression Screw for Femoral Neck Fractures |
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| Publication Number | Publication Date |
|---|---|
| CN110974387A true CN110974387A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911340606.9A Pending CN110974387A (en) | 2019-12-23 | 2019-12-23 | A Novel Support Compression Screw for Femoral Neck Fractures |
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| CN (1) | CN110974387A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112603517A (en) * | 2020-12-04 | 2021-04-06 | 无锡市第九人民医院 | Hollow bidirectional threaded nail used in fracture treatment process |
| CN113425400A (en) * | 2021-04-08 | 2021-09-24 | 首都医科大学附属北京潞河医院 | Fixed femoral neck fracture's anti-V word configuration hollow screw subassembly |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209722U (en) * | 1986-11-29 | 1987-12-05 | 无锡第四人民医院 | Pressure nail with threaded ends and its auxiliary appliances used for the treatment of thighbone and cervical vertebra fracture |
| CN2066313U (en) * | 1990-06-06 | 1990-11-28 | 北京理工大学技术开发公司 | Pressure hollow screw for internal fix of bone |
| CN2138480Y (en) * | 1992-09-30 | 1993-07-21 | 陈杰喜 | Self driving three moveable wing screw |
| CN200998304Y (en) * | 2007-01-22 | 2008-01-02 | 王天旭 | Locking dynamic hip joint screw nail |
| CN102058426A (en) * | 2010-12-29 | 2011-05-18 | 洪宁 | Pressurized hollow nail |
| CN201930067U (en) * | 2010-12-29 | 2011-08-17 | 洪宁 | Pressurization hollow screw |
| CN105596069A (en) * | 2016-02-17 | 2016-05-25 | 陆海波 | Internal fixing device for treating femoral neck fracture |
| CN208404807U (en) * | 2017-12-13 | 2019-01-22 | 天津市威曼生物材料有限公司 | A kind of novel metal nail for collum femoris,hip |
| CN211883996U (en) * | 2019-12-23 | 2020-11-10 | 首都医科大学附属北京潞河医院 | A Novel Support Compression Screw for Femoral Neck Fractures |
-
2019
- 2019-12-23 CN CN201911340606.9A patent/CN110974387A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209722U (en) * | 1986-11-29 | 1987-12-05 | 无锡第四人民医院 | Pressure nail with threaded ends and its auxiliary appliances used for the treatment of thighbone and cervical vertebra fracture |
| CN2066313U (en) * | 1990-06-06 | 1990-11-28 | 北京理工大学技术开发公司 | Pressure hollow screw for internal fix of bone |
| CN2138480Y (en) * | 1992-09-30 | 1993-07-21 | 陈杰喜 | Self driving three moveable wing screw |
| CN200998304Y (en) * | 2007-01-22 | 2008-01-02 | 王天旭 | Locking dynamic hip joint screw nail |
| CN102058426A (en) * | 2010-12-29 | 2011-05-18 | 洪宁 | Pressurized hollow nail |
| CN201930067U (en) * | 2010-12-29 | 2011-08-17 | 洪宁 | Pressurization hollow screw |
| CN105596069A (en) * | 2016-02-17 | 2016-05-25 | 陆海波 | Internal fixing device for treating femoral neck fracture |
| CN208404807U (en) * | 2017-12-13 | 2019-01-22 | 天津市威曼生物材料有限公司 | A kind of novel metal nail for collum femoris,hip |
| CN211883996U (en) * | 2019-12-23 | 2020-11-10 | 首都医科大学附属北京潞河医院 | A Novel Support Compression Screw for Femoral Neck Fractures |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112603517A (en) * | 2020-12-04 | 2021-04-06 | 无锡市第九人民医院 | Hollow bidirectional threaded nail used in fracture treatment process |
| CN113425400A (en) * | 2021-04-08 | 2021-09-24 | 首都医科大学附属北京潞河医院 | Fixed femoral neck fracture's anti-V word configuration hollow screw subassembly |
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Application publication date: 20200410 |