CN117814893A - Arc screw with fixed bending radius - Google Patents
Arc screw with fixed bending radius Download PDFInfo
- Publication number
- CN117814893A CN117814893A CN202311862544.4A CN202311862544A CN117814893A CN 117814893 A CN117814893 A CN 117814893A CN 202311862544 A CN202311862544 A CN 202311862544A CN 117814893 A CN117814893 A CN 117814893A
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- CN
- China
- Prior art keywords
- arc
- screw
- bend radius
- shaped body
- fixed bend
- 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.)
- Pending
Links
- 238000005452 bending Methods 0.000 title abstract description 10
- 239000011295 pitch Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 210000004197 pelvis Anatomy 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001788 irregular Effects 0.000 abstract description 3
- 210000000988 bone and bone Anatomy 0.000 description 13
- 206010017076 Fracture Diseases 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000001356 surgical procedure Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000000399 orthopedic effect Effects 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 206010034246 Pelvic fractures Diseases 0.000 description 1
- 208000006735 Periostitis Diseases 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 230000001054 cortical effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003460 periosteum Anatomy 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
Abstract
The invention provides an arc screw with fixed bending radius, which comprises the following components: the arc-shaped body is of a hollow structure; the fixing screw is rotatably arranged at the far end of the arc-shaped body; and the fixing hole is arranged at the proximal end of the arc-shaped body. The arc screw has the advantages of simple structure, good fixing effect and low cost, is suitable for the irregular pelvis form and increases a safe operation channel. Both the distal and proximal ends may be secured by different set screws selected according to the pelvic morphology of the patient.
Description
Technical Field
The invention belongs to the field of medical instruments, relates to a medical instrument for orthopedic surgery, and in particular relates to an arc screw for orthopedic surgery.
Background
Bone screws are required for fracture fixation operations, and currently existing bone screws are all straight screws. When bone tissue at the fracture is thick, the anchoring position is sufficient, and a straight screw can be selected. However, when the radian of bone tissue exists at the fracture part and the bone tissue is thinner, if a straight screw is adopted, the bone surface can be penetrated, the periosteum blood vessel and important viscera are damaged, and the safety of a patient is threatened. The human pelvis is complex and irregular in structure, and the existing straight screw cannot perfectly fit with the osseous connecting channel, so that the effective screw connecting channel is even reduced. The human pelvis structure tends to be arc-shaped, the arc-shaped screw is more suitable for the arc-shaped structure of the pelvis, and simultaneously, the screw channel is effectively increased, so that the safety of clinical operation is improved.
For this situation, as shown in fig. 1, curvaFix provides a solution for flexible arc screws, which has the advantage of very high flexibility in the feeding path, and has great difficulty in process manufacturability, complex kit and high cost due to its special structural design.
Therefore, there is an urgent need in the art for an arc screw that has a simple structure, good fixing effect, and low cost.
Disclosure of Invention
In order to solve the existing problems, the invention provides an arc screw with a fixed bending radius, a fixing screw can be assembled at the far end, a fixing hole is formed in the arc body at the near end, and the fixing screw penetrates through the fixing hole to fix the near end.
According to one aspect of the present invention, there is provided an arc screw having a fixed bending radius, comprising:
the arc-shaped body is of a hollow structure;
the fixing screw is rotatably arranged at the far end of the arc-shaped body;
and the fixing hole is arranged at the proximal end of the arc-shaped body.
Further, the fixing screw is detachably arranged at the far end of the arc-shaped body, one or more fixing holes are formed at the near end of the arc-shaped body at a preset angle.
Further, the arc screw is made of medical grade stainless steel.
Further, the distal end of the arc-shaped body is provided with an opening, and the diameter of the opening is smaller than the hollow inner diameter of the arc-shaped body.
Further, a plurality of types of set screws are included, each set screw having a diameter that fits into the opening.
Further, the fixing screw is a self-tapping screw.
Further, the plurality of types of set screws have different lengths, different pitches, or different leading ends.
Further, one or more fixing holes are included.
Further, the plurality of fixing holes have different diameters.
Further, the plurality of fixing holes and the tangent line of the arc-shaped body have different included angles.
Further, the proximal end of the arc-shaped body is provided with a hammering end face.
The arc screw is suitable for pelvis irregular forms, and a safe operation channel is increased. Both the distal and proximal ends may be secured by different set screws selected according to the pelvic morphology of the patient.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout exemplary embodiments of the disclosure.
Fig. 1 is a schematic view of the overall structure of a CurvaFix arc screw according to the prior art.
Fig. 2 is a schematic view of the structure of the arc-shaped soft drill and the k-wire according to the embodiment of the present invention.
Fig. 3 is a schematic view of the installation of an arc screw according to an embodiment of the present invention.
Fig. 4 is a schematic view of the installation of a set screw according to an embodiment of the present invention.
Fig. 5 is a sectional view of the installation of a set screw according to an embodiment of the present invention.
Fig. 6 is a cross-sectional view of an arc screw according to an embodiment of the present invention after fixation.
In the figure:
the flexible drill comprises an arc-shaped flexible drill 1, a Kirschner wire 2, an arc-shaped body 3, a fixing screw 4, a flexible screwdriver 5, a fixing needle 6 and a fixing hole 7.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention relates to an arc screw with a fixed bending radius, comprising:
the arc-shaped body is of a hollow structure;
the fixing screw is rotatably arranged at the far end of the arc-shaped body;
and the fixing hole is arranged at the proximal end of the arc-shaped body.
The arc screw of the invention can be used for orthopedic surgery, a series of arc screws with fixed bending radius can be designed and manufactured in advance, and different bending radii and lengths are suitable for different patient sizes. Alternatively, the curved screw appropriate for the patient may be manufactured by 3D printing prior to surgery, depending on the customer's pelvic size and morphology.
Specifically, the arc body is hollow in the middle, is made of medical grade stainless steel, and can be connected with a front end (far end) fixing screw at the front end of the arc screw, and a Kirschner wire channel is preset at the rear end (near end) of the arc screw for fixing the arc screw in place.
Specifically, the fixing screw is detachably arranged at the distal end of the arc-shaped body, one or more fixing holes are formed at the proximal end of the arc-shaped body at a preset angle. The distal end of the arc-shaped body is provided with an opening, and the diameter of the opening is smaller than the hollow inner diameter of the arc-shaped body. The diameter of the opening is also smaller than the diameter of the nut of the set screw.
In particular, it is possible to choose to use a plurality of types of fixing screws, each having a diameter adapted to the opening of the arc-shaped body, according to the condition of the patient. For example, set screws having different lengths, different pitches, or different leading ends may be selected. Preferably, the front end portion of the fixing screw is a self-tapping screw.
Preferably, the proximal end of the arcuate body may be provided with one or more securing holes. The plurality of fixing holes can have different diameters, and different included angles are formed between the plurality of fixing holes and the tangent line of the arc-shaped body. When fixing the proximal end of the arc screw, a doctor can select a proper fixing needle to pass through a proper fixing hole according to the specific condition of a patient and put into the body of the patient for fixing.
Preferably, the proximal end of the arcuate body is provided with a hammering end surface, which is convenient for a doctor to operate when placing the arcuate screw, and a hammer can be used to assist in feeding the screw.
In order to facilitate understanding of the solution and the effects of the embodiments of the present invention, a specific application example is given below. It will be understood by those of ordinary skill in the art that the examples are for ease of understanding only and that any particular details thereof are not intended to limit the present invention in any way.
Example 1
As shown in fig. 6, the arc screw of the present embodiment includes an arc body 3, a fixing screw 4, and a fixing hole 7. The arc body 3 is a hollow structure, in this embodiment, the inside of the arc body 3 has an arc cylindrical hole with the same radian, and an arc kirschner wire can be placed therein. The distal end of the arcuate body 3 has an opening with a diameter smaller than the diameter of the inner arcuate cylindrical bore and smaller than the diameter of the nut of the set screw 4. The fixing screw can be placed to the distal end along the arc cylindrical hole inside the arc body 3, the front end of the fixing screw 4 extends out of the opening, the nut is blocked by the opening, and the fixing screw 4 can be fixed in cancellous bone of a patient, so that the distal end of the arc screw is fixed.
A fixing hole 7 is provided at the proximal end of the arc-shaped body 3, and in this embodiment the fixing hole 7 penetrates the side wall of the arc-shaped body 3, preferably along the tangential direction of the arc-shaped body 3. A fixation needle or pin may be used to pass through the fixation hole 7 and be secured within the cancellous bone of the patient, thereby securing the proximal end of the arcuate screw.
Example two
The whole process of setting, fixing and removing the arc screw is described in detail with reference to fig. 2 to 6. The arc screw is a consumable product of a pelvis fracture reduction robot product, and can finish nail placement and nail removal by means of pelvis fracture reduction planning and holding and movement of a mechanical arm.
Firstly, planning and selecting arc screws: for patients with pelvic fractures, a suitable arc screw of a suitable size, a suitable length, and an optimal arc screw insertion position may be recommended during pre-operative planning according to the bony passages available to the patient. The arc screw suitable for the patient is selected from a series of arc screws with fixed bending radius which are designed and manufactured in advance, or the arc screw suitable for the patient is manufactured by a 3D printing mode.
Next, a suitable soft drill is selected. A series of soft drills with sleeves can be designed in advance, the diameter of the drill bit at the front end slightly exceeds the diameter of the sleeve, the drill bit can freely rotate when being connected with the front end of the sleeve, the drill bit is connected with a flexible hollow shaft in the sleeve, and the tail end of the flexible hollow shaft is connected with power to drive the drill bit to rotate. The sleeve is of an arc-shaped hollow structure, and the radian of the sleeve is consistent with that of a pre-designed and manufactured arc-shaped screw. Specifically, each arc screw with a fixed bending radius is provided with a sleeve with the same radian, so that an arc channel with the same radian can be drilled, and the arc screw can be conveniently placed at the back.
Next, a nail setting process of performing an arc screw by a robot will be described:
1. planning an arc screw feeding position, and moving a holding front end tool by a mechanical arm to break skin and cortical bone at the screw feeding position;
2. the mechanical arm holds the hand drill, and the hand drill drills straight drill for about 3mm;
3. selecting a proper arc screw according to the planning, wherein the selected parameters comprise the radian and the size of the arc screw, and then selecting a proper sleeve;
4. the mechanical arm holds the sleeve, the drill bit of the arc-shaped soft drill 1 is arranged at the front end of the sleeve, the transmission shaft of the soft drill is positioned in the sleeve, the driving device of the soft drill is positioned outside the sleeve, and power is provided for the drill bit through the flexible transmission shaft. The outer diameter of the soft drill bit is slightly larger than that of the arc-shaped body 3, and the soft drill bit is of a hollow structure, so that the drill bit is in an impeller shape and bone residues are conveniently led out. The mechanical arm holds the sleeve and the soft drill and stops after moving to a planning position, an arc Kirschner wire 2 is driven into the soft drill along the middle channel of the arc soft drill 1 until the soft bone at the front end of the soft drill is removed, the arc soft drill 1 is removed, and the arc Kirschner wire 2 is reserved;
5. the arc-shaped body 3 of the arc-shaped screw enters along a channel generated by the Kirschner wire 2 and the arc-shaped soft drill 1, and the arc-shaped body 3 is driven by the mechanical arm to reach an ideal planning position;
6. the mechanical arm moves back to remove the arc Kirschner wire 2, and the arc body 3 is reserved.
7. Selecting a proper fixing screw 4, installing the front fixing screw 4 at the front end of the flexible screwdriver 5, advancing to the front end along the middle channel of the arc-shaped body 3 together, rotating the T-shaped handle of the flexible screwdriver 5 clockwise, fixing the front fixing screw 4 in cancellous bone, and removing the flexible screwdriver 5;
8. the rear end fixing needle 6 enters along the tail of the arc-shaped body 3, the fixing needle 6 penetrates out of the fixing hole 7 of the arc-shaped screw along the tangential direction, and the fixing needle 6 is fixed in cancellous bone, so that the arc-shaped screw is placed and fixed.
Next, the nail removing process is described:
firstly, removing the rear end fixing needle 6;
using a flexible screwdriver 5 to screw the front end fixing screw 4 along the middle channel of the arc-shaped body 3, and rotating the flexible screwdriver 5 anticlockwise to unscrew the front end fixing screw 4;
the arc-shaped body 3 and the front end fixing screw 4 are taken out integrally.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention has been given for the purpose of illustrating the benefits of embodiments of the invention only and is not intended to limit embodiments of the invention to any examples given.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (11)
1. An arcuate screw having a fixed bend radius, comprising:
the arc-shaped body is of a hollow structure;
the fixing screw is rotatably arranged at the far end of the arc-shaped body;
and the fixing hole is arranged at the proximal end of the arc-shaped body.
2. The fixed bend radius arc screw of claim 1 wherein the set screw is removably disposed at a distal end of the arc body and the one or more fixation holes are disposed at a proximal end of the arc body at a predetermined angle.
3. The fixed bend radius arc screw of claim 2 wherein the arc screw is medical grade stainless steel.
4. The fixed bend radius arc screw of claim 1 wherein the distal end of the arc body is provided with an opening having a diameter less than the hollow inner diameter of the arc body.
5. The fixed bend radius arc screw of claim 4 comprising a plurality of types of set screws, each set screw having a diameter that fits into the opening.
6. The fixed bend radius arc screw of claim 1 wherein the set screw is a self-tapping screw.
7. The fixed bend radius arc screw of claim 5 wherein the multiple types of set screws have different lengths, different pitches, or different leading ends.
8. The fixed bend radius arc screw of claim 1 comprising one or more fixation holes.
9. The fixed bend radius arc screw of claim 8 wherein the plurality of fixation holes have different diameters.
10. The fixed bend radius arc screw of claim 8 wherein the plurality of fixation holes have different angles with a tangent to the arc body.
11. The fixed bend radius arc screw of claim 1 wherein the proximal end of the arc body is provided with a hammering end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311862544.4A CN117814893A (en) | 2023-12-29 | 2023-12-29 | Arc screw with fixed bending radius |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311862544.4A CN117814893A (en) | 2023-12-29 | 2023-12-29 | Arc screw with fixed bending radius |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117814893A true CN117814893A (en) | 2024-04-05 |
Family
ID=90510974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311862544.4A Pending CN117814893A (en) | 2023-12-29 | 2023-12-29 | Arc screw with fixed bending radius |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117814893A (en) |
-
2023
- 2023-12-29 CN CN202311862544.4A patent/CN117814893A/en active Pending
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