CN215821129U - Combined pressurization hollow bone screw - Google Patents
Combined pressurization hollow bone screw Download PDFInfo
- Publication number
- CN215821129U CN215821129U CN202120535462.9U CN202120535462U CN215821129U CN 215821129 U CN215821129 U CN 215821129U CN 202120535462 U CN202120535462 U CN 202120535462U CN 215821129 U CN215821129 U CN 215821129U
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- China
- Prior art keywords
- thread
- screw
- screw body
- bone
- pressurizing
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- Expired - Fee Related
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- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 67
- 238000010079 rubber tapping Methods 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 208000010392 Bone Fractures Diseases 0.000 abstract description 28
- 230000000694 effects Effects 0.000 abstract description 3
- 206010017076 Fracture Diseases 0.000 description 18
- 230000035876 healing Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000002513 implantation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
Abstract
The utility model provides a combined type pressurization hollow bone screw, which comprises a detachable screw body and a pressurization part, wherein the screw body is provided with a screw hole; the screw body is for being provided with the cylindrical of a through-hole, include: the first thread is arranged on the outer surface of at least one part of the screw body, and a first end surface is arranged on the crest of the first thread; a second thread disposed on at least a portion of the first end surface; a self-tapping thread provided at a first end of the screw body; and a first connecting thread; the pressurizing part is internally provided with a through hole and comprises a second connecting thread and a pressurizing thread, and the second connecting thread is arranged on the inner wall of the pressurizing part; the pressurizing screw is arranged on the outer wall of the pressurizing part. The combined type pressurization hollow bone screw provided by the utility model has the advantages that the pressurization part and the screw body are arranged into two detachable parts, the screw body is implanted firstly, the broken bone at the fracture part is connected and fixed, and then the screw body is fixed and screwed into the pressurization part, so that the pressurization effect is better.
Description
Technical Field
The utility model relates to the technical field of bone screw medical instruments, in particular to a combined type pressurization hollow bone screw.
Background
The bone screw comprises a bone screw which is used for connecting, fixing and supporting the broken bone of the fracture part, so that the connection of the fracture part and the healing of the fracture seam are facilitated. The existing bone screw is generally provided with a pressurizing structure, after the bone screw is screwed into a fracture part and connected with the broken bone, the pressurizing structure can also be screwed into a bone or a bone fracture plate to apply pressure to the fracture part, so that partial gaps existing at the fracture part are pressurized and closed, and the fracture healing is facilitated.
The existing pressurized hollow bone screw has partial problems in use, part of the bone screw is implanted into bones by adopting a Kirschner wire or a guide wire for guiding and implanting, and in the healing process of the part of the bone screw after implantation, because the mechanical property of the screw is greatly different from the biomechanical property of the bones, the screw can be partially deviated and pulled out to influence the healing effect; and self-tapping threads are arranged at the front ends of part of the bone grafting screws, so that certain bone fragments can be generated in the process of implanting the bone screws, and pressure can be generated in bones. In the process of pressurizing after the partial pressurizing bone screw is connected with the fractured bone, the pressurizing effect of the pressurizing structure is poor, and the gap remained between the fractured bones cannot be completely pressurized and closed. Therefore, a bone screw that can solve the above technical problems is required.
SUMMERY OF THE UTILITY MODEL
The present invention addresses the deficiencies of the prior art by providing a bone screw having improved compression, connection and fixation support.
The utility model adopts the following technical scheme for solving the technical problems:
the utility model provides a combined type pressurization hollow bone screw, which comprises a detachable screw body and a pressurization part, wherein the screw body is provided with a screw hole; the screw body is for being provided with the cylindrical of a through-hole, includes:
the first thread is arranged on the outer surface of at least one part of the screw body, and a first end surface is arranged on the crest of the first thread;
a second thread disposed on at least a portion of the first end surface;
the self-tapping thread is arranged at the first end of the screw body; and
the first connecting thread is arranged at the second end of the screw body;
the pressurizing member is provided with a through hole therein, and includes:
the second connecting thread is arranged on the inner wall of the pressurizing part and matched with the first connecting thread; and
a pressurizing screw thread provided on an outer wall of the pressurizing member;
the end face of the second end of the screw body is provided with a screw control structure for controlling the screw body to rotate; and a pressurizing control structure for controlling the rotation of the pressurizing component is arranged on the second end of the pressurizing component.
Further, the second thread is one of a triangular thread, a rectangular thread, a trapezoidal thread, and a buttress thread.
Further, the second thread is located in a middle of the first end face.
Further, a chip groove is formed in the side wall of the screw body.
Further, the flutes are helical.
Further, the cross section of the pressing component is bowl-shaped or trapezoid.
Further, after the screw body and the pressing member are connected, the outer wall forms a continuous curved surface.
Further, the inner diameter of the inner through hole at the first connection thread is smaller than the inner diameter of the through hole of the screw body.
By adopting the technical scheme, compared with the prior art, the utility model has the following technical effects:
according to the combined type pressurization hollow bone screw, the pressurization part and the screw body are arranged into two detachable parts, in the using process, the screw body is implanted firstly, after the broken bone at the fracture part is connected and fixed, the screw body is fixed and screwed into the pressurization part, so that the pressurization screwing of the pressurization part is free from the resistance between the screw and the bone, and the pressurization part further applies pressure to the bone or the bone fracture plate, so that the crack existing at the fracture part is closed better; the front end of the screw body is provided with self-tapping threads, so that the self-tapping screws can be conveniently implanted into bones, the crest of the first threads on the screw body is also provided with second threads, the contact area between the threads and the bones can be increased, the tendency of the screw to rotate and pull out is reduced, the combination of the screw body and the bones is tighter, and the closure and healing of bone fractures after bone fracture are facilitated; the surface of the screw body is also provided with the chip groove, so that bone chips generated in the process of screwing the screw into the skeleton can be accommodated, the resistance of the bone chips to the screw is reduced, the pressure of the screw on the skeleton caused by the bone chips is reduced, and the screw is favorable for healing.
Drawings
FIG. 1 is a schematic structural view of a combination compression cannulated bone screw according to one embodiment of the present invention;
FIG. 2 is a schematic view of the combination compression cannulated bone screw showing the assembly of the screw body and the compression member;
FIG. 3 is a cross-sectional view of a screw control structure in a combination-type cannulated bone screw according to one embodiment of the present invention;
FIG. 4 is a cross-sectional view of a compression control structure in the combination compression cannulated bone screw according to one embodiment of the present invention;
FIG. 5 is a schematic structural view of a driver used with the combination cannulated bone screw according to one embodiment of the present invention;
wherein the reference numerals are: 10-screw body, 11-first thread, 12-first end face, 13-second thread, 14-self-tapping thread, 15-first connecting thread, 16-chip groove, 17-screw control structure, 18-first screwdriver, 20-pressing member, 21-second connecting thread, 22-pressing thread, 23-pressing control structure, 24-second screwdriver.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings for better understanding of the present invention, but not to limit the scope of the present invention.
As shown in fig. 1, the present invention provides a combined type pressurization hollow bone screw including a detachable screw body 10 and a pressurization part 20. The screw body 10 is a cylinder provided with a through hole, and the through hole is coaxial with the cylinder; the screw body 10 includes first threads 11, second threads 13, self-tapping threads 14, and first connecting threads 15.
A first thread 11 is provided on an outer surface of at least a portion of the screw body 10 for cutting and screwing into a bone during insertion of the screw body 10 into the bone; the crest of the first thread 11 is provided with a first end surface 12, i.e. the crest of the first thread 11 is not a sharp surface. In a preferred embodiment, the first thread 11 is a thread having a trapezoidal, saw-tooth or rectangular cross-section so that its crest is provided with a flat surface.
The second thread 13 is arranged on at least a part of the first end surface 12, i.e. the second thread 13 is arranged on at least a part of the first thread 11. In a preferred embodiment, the second thread 13 is a groove provided on the first end surface 12 on the crest of the first thread 11. The second thread 13 may be provided as any one of a rectangular thread, a trapezoidal thread, a triangular thread, or a buttress thread. The existence of the second thread 13 increases the contact area between the first thread 11 and the screw body 10 and the bone, thereby increasing the bearing area of the surface of the screw body 10 and reducing the unscrewing tendency of the screw body 10 in the bone.
Preferably, the second thread 13 is located in the middle of the first end face 12. It will be appreciated by those skilled in the art that the second thread 13 is provided without affecting the strength of the first thread 11, i.e. the depth and width of the second thread 13 are adjustable at the crest of the first thread 11, and the width of the second thread 13 is 1/2 of the first end surface 12, but all of the adjustments are made without affecting the strength of the first thread 11.
The self-tapping thread 14 is provided at the first end of the screw body 10, i.e., the end implanted into the bone, and the self-tapping thread 14 assists the surgeon in better implanting the screw, reducing implantation resistance.
The side wall of the screw body 10 is also provided with a chip groove 16; the chip groove 16 is disposed on at least a portion of the side wall of the screw body 10 and is spirally configured to receive bone chips generated during screwing of the screw body 10 into a bone, so as to prevent excessive bone chips from being retained between the screw body 10 and the bone and generating excessive pressure on the bone.
As shown in fig. 2, a first connection thread 15 is provided at the second end of the screw body 10 for connecting and fixing with the pressing member 20. The diameter of the first connecting thread 15 is smaller than that of the screw body 10 where no thread is provided; the diameter of the first end of the pressing member 20 matches the diameter of the part of the screw body 10 where no thread is provided, i.e. after the pressing member 20 and the screw body 10 are connected into a whole, the outer surfaces of the pressing member 20 and the screw body 10 are connected smoothly and continuously, and the outer walls are connected to form a continuous curved surface.
In order to facilitate the arrangement of the first connecting thread 15, the inner diameter of the through hole inside the first connecting thread 15 on the screw body 10 is smaller than the inner diameter of the through hole of the screw body 10, so as to avoid reducing the strength of the screw body 10 at the first connecting thread 15.
The pressing member 20 is provided with a through hole therein and includes a second connecting screw 21 and a pressing screw 22. The second connection screw 21 is provided on the inner wall of the through hole of the pressing member 20 to match the first connection screw 15, so that the pressing member 20 is connected to the screw body 10.
The cross-section of the pressing member 20 is bowl-shaped or trapezoid, that is, the pressing member 20 is overall hemispherical or truncated cone-shaped, and the diameter thereof gradually increases in the direction away from the screw body 10, so that the pressing member gradually generates pressure during screwing into the bone or the bone fracture plate.
The pressurizing thread 22 is disposed on the outer wall of the pressurizing member 20, and is used for screwing into a bone or a bone plate during the rotation connection of the pressurizing member 20 and the screw body 10 to generate pressure on the fracture site, so as to close the existing gap at the fracture site, thereby facilitating the healing of the bone. It should be noted that the pitch of the pressure screw 22 is the same as that of the second connecting screw 21, and the same moving distance of the same number of rotations of the pressure screw 22 and the second connecting screw 21 is ensured.
As shown in fig. 3 to 4, a screw control structure 17 for controlling the rotation of the screw body 10 is disposed on an end surface of the second end of the screw body 10; a second end of the pressure member 20 is provided with a pressure control structure 23 for controlling the rotation of the pressure member 20. The screw control structure 17 and the pressing control structure 23 are each a recess for inserting a screwdriver and controlling the rotation of the screw body 10 or the pressing member 20. The screw control structure 17 and the pressurization control structure 23 are selected from one of an inner hexagon, a quincunx, a cross, and a straight. In a preferred embodiment of the utility model, the screw control structure 17 is of internal hexagonal shape and the pressurization control structure 23 is of quincunx shape.
As shown in fig. 5, the bone screw according to the present invention is implanted by a driver and the screw body 10 is connected to the pressing member 20. The matched screw drivers comprise a first screw driver 18 and a second screw driver 24, the front end of the first screw driver 18 is matched with the shape of the screw control structure 17, the front end of the second screw driver 24 is matched with the shape of the pressurizing control structure 23, the first screw driver 18 can control the rotation of the screw body 10, and the second screw driver 24 can control the rotation of the pressurizing part 20.
A through hole is provided in the first driver 18 for passing a k-wire or guide wire during implantation of the screw body 10. A through hole is provided in the second driver 24 for passing the first driver 18 and the k-wire or guide wire during the connection of the pressing member 20 with the screw body 10, i.e. the through hole of the second driver 24 has an inner diameter larger than the diameter of the first driver 18.
Specifically, the use process of the bone screw provided by the utility model is as follows: firstly, the fracture is dragged and restored, the guide pin of the hollow bone screw is implanted, then the screw body 10 is implanted into the skeleton and connected with the two ends of the fracture through the first screwdriver 18 and the screw control structure 17, the fracture gap is ensured to be closed, and the fracture restoration is complete; then, the second screwdriver 24 is connected with the pressing member 20, the first screwdriver 18 passes through the through holes of the second screwdriver 24 and the pressing member 20, the screw control structure 17 is inserted to control the screw body 10 to be fixed, then the first end of the pressing member 20 is contacted with the second end of the screw body 10 through the second screwdriver 24, the second screwdriver 24 is rotated to combine the pressing member 20 and the screw body 10 into a whole through the first connecting thread 15 and the second connecting thread 21; meanwhile, the pressurizing thread 22 is screwed into the skeleton or the reinforcing plate to generate pressure on the fracture part, so that the existing gap at the fracture part is promoted to be closed, and the fracture healing is facilitated; finally, other bone screws are implanted, the restoration and fixation are confirmed to be perfect, and the wound surface is washed and sutured.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications or alterations to this practice will occur to those skilled in the art and are intended to be within the scope of this invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (8)
1. A combined type pressurization hollow bone screw, characterized by comprising a detachable screw body (10) and a pressurization part (20); the screw body (10) is cylindrical for being provided with a through-hole, includes:
the first thread (11) is arranged on at least one part of the outer surface of the screw body (10), and a first end surface (12) is arranged on the crest of the first thread (11);
a second thread (13) provided on at least a portion of said first end face (12);
a self-tapping thread (14) provided at a first end of the screw body (10); and
a first connecting thread (15) provided at a second end of the screw body (10);
the pressing member (20) is provided with a through hole therein, and includes:
a second connection thread (21) provided on the inner wall of the pressing member (20) to match the first connection thread (15); and
a pressing screw (22) provided on an outer wall of the pressing member (20);
a screw control structure (17) for controlling the rotation of the screw body (10) is arranged on the end surface of the second end of the screw body (10); and a pressurizing control structure (23) for controlling the pressurizing component (20) to rotate is arranged at the second end of the pressurizing component (20).
2. The cannulated bone screw according to claim 1, wherein the second thread (13) is one of a triangular thread, a rectangular thread, a trapezoidal thread and a buttress thread.
3. The cannulated bone screw according to claim 1, wherein the second thread (13) is located in a middle portion of the first end face (12).
4. The cannulated bone screw according to claim 1, wherein the side wall of the screw body (10) is further provided with flutes (16).
5. The cannulated bone screw according to claim 4, wherein the flutes (16) are helical.
6. The cannulated bone screw of claim 1, wherein the cross-section of the compression member (20) is bowl-shaped or trapezoidal.
7. The hollow bone screw according to claim 1, wherein the outer wall of the screw body (10) forms a continuous curved surface after the connection with the pressing member (20).
8. The cannulated bone screw according to claim 1, wherein the internal diameter of the internal through bore at the first connecting thread (15) is smaller than the internal diameter of the through bore of the screw body (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120535462.9U CN215821129U (en) | 2021-03-15 | 2021-03-15 | Combined pressurization hollow bone screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120535462.9U CN215821129U (en) | 2021-03-15 | 2021-03-15 | Combined pressurization hollow bone screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215821129U true CN215821129U (en) | 2022-02-15 |
Family
ID=80187487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120535462.9U Expired - Fee Related CN215821129U (en) | 2021-03-15 | 2021-03-15 | Combined pressurization hollow bone screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215821129U (en) |
-
2021
- 2021-03-15 CN CN202120535462.9U patent/CN215821129U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220215 |