CN220833124U - Pedicle screw with anti-extraction function - Google Patents
Pedicle screw with anti-extraction function Download PDFInfo
- Publication number
- CN220833124U CN220833124U CN202322012618.7U CN202322012618U CN220833124U CN 220833124 U CN220833124 U CN 220833124U CN 202322012618 U CN202322012618 U CN 202322012618U CN 220833124 U CN220833124 U CN 220833124U
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- screw
- core
- pedicle
- side block
- piece
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- 238000000605 extraction Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000001125 extrusion Methods 0.000 claims description 8
- 239000002639 bone cement Substances 0.000 claims description 7
- 210000000078 claw Anatomy 0.000 claims description 3
- 206010052428 Wound Diseases 0.000 abstract description 3
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000004927 fusion Effects 0.000 abstract description 3
- 238000002513 implantation Methods 0.000 abstract description 3
- 230000002980 postoperative effect Effects 0.000 abstract description 3
- 206010018852 Haematoma Diseases 0.000 abstract description 2
- 208000003076 Osteolysis Diseases 0.000 abstract description 2
- 206010036410 Postoperative wound infection Diseases 0.000 abstract description 2
- 208000031650 Surgical Wound Infection Diseases 0.000 abstract description 2
- 208000029791 lytic metastatic bone lesion Diseases 0.000 abstract description 2
- 208000029761 vertebral disease Diseases 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 7
- 241000587161 Gomphocarpus Species 0.000 description 5
- 239000011295 pitch Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 208000001132 Osteoporosis Diseases 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 239000007943 implant Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 208000032843 Hemorrhage Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000037182 bone density Effects 0.000 description 1
- 230000001054 cortical effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 208000015122 neurodegenerative disease Diseases 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 201000008827 tuberculosis Diseases 0.000 description 1
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- Surgical Instruments (AREA)
- Prostheses (AREA)
Abstract
The utility model relates to the technical field of medical instruments, and discloses a pedicle screw with an anti-extraction function. The screw is easy to loosen and slide after being screwed into the vertebral body through the pedicle in the prior art, does not have the anti-pulling performance, has large difficulty in maintaining operation of resetting in the screw implantation process, and has poor treatment effect. The utility model comprises an integrally formed screw body, a screw tail part and a screw core positioned in the screw body, wherein screw external threads are arranged outside the screw body, a hollow structure in which the screw core can move is arranged in the screw body, at least one rotary side block is arranged on the screw body, a rotary shaft is arranged in the rotary side block, one end of the screw core is movably connected with the rotary side block, a U-shaped groove is formed in the screw tail part, and tail internal threads are arranged in the U-shaped groove. The utility model has large anti-extraction force, small wound and high postoperative fusion rate, and can reduce the conditions of postoperative wound infection, hematoma, internal fixation looseness, adjacent vertebral disease, osteolysis and the like of patients.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to a pedicle screw with an anti-extraction function.
Background
Since the 1959 Boucher proposes transpedicular screw internal fixation, the screw can effectively provide three-column fixation of the spine, and is widely applied to various diseases of spine surgery at present, including spine fracture, degenerative disease, tumor, tuberculosis and the like. However, the tissue stripping range in the operation is wide, the wound is larger, the bleeding amount is more, the pedicle fracture is easy to generate infection, the screw is loosened, pulled out, broken and the like after the operation, and the screw loosening and pulling out are more common especially in osteoporosis patients.
Chinese patent literature in the prior art: CN208910453U discloses a pedicle screw, including the U-shaped nail head and the screw pole of interconnect, the screw pole inside cavity, be provided with the external screw thread on the screw pole, the one end of keeping away from U-shaped nail head on the screw pole is formed with a plurality of side openings, every side opening sets gradually on the screw pole between the adjacent screw thread tooth, make things convenient for bone cement to implant, the side opening distributes on the same axial straight line of screw pole, U-shaped opening department lateral wall of U-shaped nail head inclines to U-shaped opening and forms the domatic, the external screw thread includes the fastening screw thread portion and the maintenance screw thread portion that have two kinds of different screw pitches, fastening screw thread portion is close to U-shaped nail head one side, maintenance screw thread portion keeps away from U-shaped nail head one side, the screw pitch of fastening screw thread portion is less than pitch maintenance screw thread portion, the screw pitch of solid screw thread portion is 1mm, the screw pitch of maintenance screw thread portion is 2.75mm, the screw thread tooth of fastening screw thread portion and maintenance screw thread portion is zigzag; the width of the top of the thread of the fastening thread part is 0.1mm, the thread lead angle of one side of the thread of the fastening thread part is 3 degrees, the included angle radius is 0.2mm, the thread lead angle of the other side of the thread of the fastening thread part is 35 degrees, and the included angle radius is 0.6mm; the width of the thread top of the thread part is maintained to be 0.2mm, the thread lead angle of one side of the thread part is maintained to be 5 degrees, the included angle radius is 0.8mm, the thread lead angle of the other side of the thread part is maintained to be 25 degrees, the included angle radius is 1.2mm, and the pedicle screw is manufactured by adopting titanium alloy processing.
However, in the implementation process, the above scheme has at least the following technical problems: after the screw is screwed into the vertebral body through the pedicle, the screw is easy to loosen and slide, has no anti-extraction property, has large maintenance operation difficulty of resetting in the screw implantation process, and has poor treatment effect.
Disclosure of Invention
In view of the technical problems, the disclosure provides a pedicle screw with an anti-extraction function, which solves the technical problems that in the prior art, after the screw is screwed into a vertebral body through a pedicle, the screw is easy to loosen and slide, the screw does not have anti-extraction property, the maintenance operation difficulty of resetting in the screw implantation process is high, and the treatment effect is poor.
According to one aspect of the present disclosure, there is provided a pedicle screw with anti-extraction function, including integrated into one piece's screw main part and screw afterbody, still including being located the inside spiral shell core of screw main part, the screw main part outside is equipped with the screw external screw thread, the inside hollow structure that is equipped with the spiral shell core and can remove of screw main part, be equipped with at least one side opening in the screw main part, install rotatory side piece in the side opening, the inside rotation axis that drives its rotation that is equipped with of rotatory side piece, spiral shell core top with rotatory side piece cooperation is in order to drive rotatory side piece turns up and forms the claw structure, the U type groove is seted up to the screw afterbody, be equipped with afterbody internal screw thread in the U type groove.
In some embodiments of the disclosure, the side hole and the rotating side block are two or more.
In some embodiments of the disclosure, the end of the rotating side block is provided with a first rotating shaft, the inside of the screw main body is provided with screw internal threads, the outside of the screw core is provided with screw core external threads matched with the screw internal threads in shape and position, and the end of the screw core is provided with an extrusion block of elastic medium; the distance between the first rotating shaft and the screw core and the distance between the end part of the rotating side block and the central axis of the screw core are A, the radius of the screw core is B, and A is smaller than B so as to realize that the rotating side block is driven to open and close by the extrusion block in the process of moving the screw core in the screw main body.
In some embodiments of the present disclosure, the screw core is provided with a through hole at a position corresponding to the side hole for implanting bone cement.
In some embodiments of the present disclosure, the screw driver further comprises a connecting piece, one end of the connecting piece is fixedly connected with the screw core, the other end of the connecting piece is movably connected with the rotating side block, and a second rotating shaft is arranged at the center shaft of the rotating side block, so that the screw core is pulled out of the screw body to drive the rotating side block to rotate and open.
The utility model has the beneficial effects that:
The anti-extraction force is large, the wound is small, the postoperative fusion rate is high, and the conditions of postoperative wound infection, hematoma, internal fixation looseness, adjacent vertebral disease, osteolysis and the like of a patient are reduced;
the U-shaped groove is internally provided with a tail internal thread, so that a clamping tool can conveniently fix the pedicle screw;
bone cement is injected through the side holes, so that fusion of the pedicle screw and the body of a patient is promoted, and the holding force of the screw is enhanced;
The screw external threads are arranged outside the screw main body, so that the connection of cortical bone is increased, and the screw is convenient to implant into a patient;
The screw core is screwed into or pulled out of the screw main body to drive the rotary side block to rotate and open, so that the force of the screw-bone contact surface is not influenced by cancellous bone density, and the screw has more advantages in patients with osteoporosis and has better early postoperative fixation strength.
Drawings
FIG. 1 is a schematic view showing the structure of a pedicle screw in a closed state in example 1;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a cross-sectional view taken along the A-A plane in FIG. 2;
FIG. 4 is a schematic view showing the structure of the pedicle screw in the opened state of example 1;
FIG. 5 is a reference view showing the extrusion state of pedicle screws in example 1;
FIG. 6 is a schematic view showing the structure of the closed state of the pedicle screw in example 2;
FIG. 7 is a left side view of FIG. 6;
FIG. 8 is a cross-sectional view taken along the A-A plane in FIG. 7;
FIG. 9 is a schematic view showing the structure of the pedicle screw in an opened state in example 2;
The names of the components in the figure are as follows: 1. a screw body; 2. a screw tail; 3. a screw core; 4. external screw threads of the screw; 5. a side hole; 6. rotating the side block; 7. a first rotation shaft; 8. a U-shaped groove; 9. tail internal threads; 10. screw internal threads; 11. a screw core external thread; 12. a through hole; 13. a connecting piece; 14. a second rotation shaft; 16 extrusion block.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1
The embodiment discloses a pedicle screw with an anti-extraction function, see fig. 1 to 5;
Including integrated into one piece's screw main part 1 and screw afterbody 2, still including being located the inside spiral shell core 3 of screw main part 1, screw main part 1 outside is equipped with screw external screw thread 4, the inside hollow structure that is equipped with spiral shell core 3 and gets to remove of screw main part 1 is equipped with two side openings 5 on the screw main part 1, install rotation side piece 6 in the side opening 5 respectively, rotation side piece 6 inside is equipped with the first rotation axis 7 that drives its rotation, spiral shell core 3 top and rotation side piece 6 cooperation in order to drive rotation side piece 6 and turn up and form and collude claw structure, U type groove 8,U type inslot 8 is equipped with afterbody internal screw thread 9 in the screw afterbody 2.
The screw body 1 is internally provided with screw internal threads 10, the screw core 3 is externally provided with screw core external threads 11 which are matched with the screw internal threads 10 in shape and position, and the end part of the screw core 3 is provided with an extrusion block 15 of an elastic medium; the distance between the first rotation shaft 7 and the screw core 3, the end of the rotation side block 6 and the central axis of the screw core 3 is A, the radius of the screw core 3 is B, and A < B is used for realizing that the rotation side block 6 is driven to open and close by the extrusion block 15 in the process of moving the screw core 3 in the screw body 1.
The screw core 3 is provided with a through hole 12 corresponding to the side hole 5 for implanting bone cement.
The embodiment of the example is as follows: firstly, a clamping tool is used for fixing the screw tail 2 of the pedicle screw through the tail internal thread 9 in the U-shaped groove 8, secondly, the screw core 3 is screwed in the hollow structure in the screw main body 1, in the screwing process, thrust is applied to the rotating side block 6, the rotating side block 6 rotates around the first rotating shaft 7, the pedicle screw is further in an open state, and finally bone cement is injected through the through hole 12.
Example 2
See fig. 6-9; the principle of the embodiment is the same as that of embodiment 1, and the concrete difference is that the screw thread fixing device further comprises a connecting piece 13, one end of the connecting piece 13 is fixedly connected with the screw thread core 3, the other end of the connecting piece is movably connected with the rotating side block 6, and a second rotating shaft 14 is arranged at the center shaft of the rotating side block 6 so as to realize that the screw thread core 3 is pulled out of the screw main body 1 to drive the rotating side block 6 to rotate and open.
The difference between this embodiment and example 1 is that the screw core 3 is pulled out from the hollow structure inside the screw body 1, and in the pulling process, the connecting piece 13 drives the rotating lateral block 6 to rotate around the second rotation axis 14, so as to realize that the pedicle screw is in an open state, and finally, bone cement is injected into the hollow structure inside the screw body 1.
While certain preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, the present utility model is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
1. Pedicle screw with prevent pulling out function, its characterized in that: including integrated into one piece's screw main part and screw afterbody, still including being located the inside spiral shell core of screw main part, the screw main part outside is equipped with the screw external screw thread, the inside hollow structure that the spiral shell core can remove that is equipped with of screw main part, be equipped with at least one side opening in the screw main part, install rotatory side piece in the side opening, rotatory side piece inside is equipped with the rotation axis that drives its rotation, the spiral shell core top with rotatory side piece cooperation, in order to drive rotatory side piece is turned up and is formed and colludes claw structure, U type groove is seted up to the screw afterbody, U type inslot is equipped with afterbody internal screw thread.
2. The pedicle screw having an anti-extraction function as claimed in claim 1, wherein: the number of the side holes and the number of the rotating side blocks are two or more.
3. The pedicle screw having an anti-extraction function as claimed in claim 1, wherein: the screw body is internally provided with screw internal threads, the screw core is externally provided with screw core external threads matched with the screw internal threads in shape and position, and the screw core end is provided with an extrusion block of an elastic medium; the distance between the first rotating shaft and the screw core and the distance between the end part of the rotating side block and the central axis of the screw core are A, the radius of the screw core is B, and A is smaller than B so as to realize that the rotating side block is driven to open and close by the extrusion block in the process of moving the screw core in the screw main body.
4. A pedicle screw having an anti-extraction function as claimed in claim 3, wherein: the screw core is provided with a through hole at the position corresponding to the side hole for implanting bone cement.
5. The pedicle screw having an anti-extraction function as claimed in claim 1, wherein: the screw bolt is characterized by further comprising a connecting piece, one end of the connecting piece is fixedly connected with the screw bolt core, the other end of the connecting piece is movably connected with the rotary side block, and a second rotating shaft is arranged at the middle shaft of the rotary side block so as to realize that the screw bolt core is pulled out of the screw bolt main body to drive the rotary side block to rotate and open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322012618.7U CN220833124U (en) | 2023-07-28 | 2023-07-28 | Pedicle screw with anti-extraction function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322012618.7U CN220833124U (en) | 2023-07-28 | 2023-07-28 | Pedicle screw with anti-extraction function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220833124U true CN220833124U (en) | 2024-04-26 |
Family
ID=90741711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322012618.7U Active CN220833124U (en) | 2023-07-28 | 2023-07-28 | Pedicle screw with anti-extraction function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220833124U (en) |
-
2023
- 2023-07-28 CN CN202322012618.7U patent/CN220833124U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |