CN112754639A - Novel interface screw - Google Patents
Novel interface screw Download PDFInfo
- Publication number
- CN112754639A CN112754639A CN202110109807.9A CN202110109807A CN112754639A CN 112754639 A CN112754639 A CN 112754639A CN 202110109807 A CN202110109807 A CN 202110109807A CN 112754639 A CN112754639 A CN 112754639A
- Authority
- CN
- China
- Prior art keywords
- screw
- main body
- thread
- interface
- tail
- 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
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
-
- 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
- A61B17/8635—Tips of screws
-
- 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
- A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone
Abstract
The invention provides a novel interface screw, which comprises an interface screw main body, wherein the interface screw main body comprises a screw tail part, a screw head part and a thread body in the middle; the screw head and the screw tail are connected into a whole through the screw body; cavities are arranged on the head part and the tail part of the screw, the cavities on the head part and the tail part of the screw are communicated with the inner cavity of the thread body along the axial direction of the interface screw main body to form a hollow hole of the interface screw main body, and the hollow hole of the interface screw main body is set to be a profile matched with an external screwdriver; the tooth socket of the thread body is hollow, a plurality of main body supporting blocks are dispersedly arranged on the tooth socket to connect adjacent threads, and hollow holes are formed between the adjacent main body supporting blocks on the same tooth socket. The hollow hole formed by the thread body and the main body supporting block can facilitate the bone to grow in the interface screw quickly, the fixing effect of the interface screw in a bone tunnel is increased, the strength of the thread body part can be increased by the main body supporting block, and the thread body part can be screwed in conveniently.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a novel interface screw for fixing an anterior cruciate ligament of a knee joint.
Background
The interface screw is mainly used for fixing the transplanted ligament in a femoral bone tunnel or a tibial bone tunnel in the knee joint anterior cruciate ligament reconstruction operation.
The main body of the traditional interface screw is mostly bullet-shaped, the outer surface is wound with a plurality of circles of threads, and the thread profile is mostly semicircular, trapezoidal, triangular and the like. The thread tooth form is semi-circular, though can effectively avoid transplanting the ligament and receive too big shearing action and lead to the ligament to break at the in-process of interface screw in, nevertheless difficult the fixing in bone tunnel has great risk of droing, leads to the operation failure. The thread profile is triangular and although effective for fixation in bone tunnels, excessive shearing tends to cause ligament rupture. The thread tooth shape is a trapezoid interface screw tooth shape which is commonly used recently, the problem that the thread has shearing effect on transplanted ligaments and the fixing strength is compensated to a certain extent can be solved, but the fixing strength is still insufficient, and the interface screw still has the risk of falling off.
At present, the structure for fixing the interface screw is generally provided with a plurality of blind holes on the outer surface so as to induce the bone ingrowth around the bone passage after the implantation and solve the problem of postoperative loosening. However, the blind holes are too small, the fixing effect is weak, the blind holes are too large, and the thread structure is damaged, so that the screwing is difficult.
Disclosure of Invention
In view of the above, the present invention provides a novel interface screw, which solves the problem of stability improvement caused by the provision of a blind hole in the prior art, and the interface screw according to the present invention directly cancels the provision of the blind hole, and sets the hollow-out shape between the threads of the thread body, and further sets the main body support block between the adjacent threads to enhance the stability.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides a novel interface screw, includes interface screw main part, interface screw main part includes the screw thread body at screw afterbody, screw head and middle part, the first end of the screw thread body twines in screw head surface, the second end of the screw thread body connect in the screw afterbody, form a whole through the screw thread body with screw head and screw afterbody connection.
The alveolus between adjacent spiral teeth on the thread body is hollow, and is equipped with a plurality of main part supporting shoes dispersedly on the alveolus in order to connect adjacent spiral teeth, forms the fretwork hole on same alveolus between the adjacent main part supporting shoe, and the fretwork hole is convenient for the bone to be quick at the inside growth of interface screw, increases the fixed action of interface screw in bone tunnel, need not additionally to set up the blind hole. Furthermore, each tooth socket is provided with three main body supporting blocks in a circle, and the positions of the main body supporting blocks on the adjacent tooth sockets are staggered.
Cavities are formed in the head part and the tail part of the screw, and the cavities in the head part and the tail part of the screw are communicated with the inner cavity of the thread body along the axial direction of the interface screw body to form hollow holes of the interface screw body.
The hollow bore of the interface screw body is configured to be contoured to match an external screwdriver. The hollow hole is provided with a contour for matching with a special screwdriver. And also facilitates bone growth.
Preferably, the profile of the hollow hole comprises a plurality of convex edges and grooves between adjacent edges, wherein the edges forming the profile of the hollow hole on the screw body are formed by protruding the inner side surface of the main body supporting block, and the edges on the screw body are aligned with the edges of the tail part of the screw and the head part of the screw.
Preferably, the body supporting block is a columnar structure with a triangular-like cross section, and the diameter of the outer curved surface of the body supporting block is equal to the maximum diameter of the screw head.
Preferably, the profile of the hollow bore comprises five ribs and five grooves, the grooves being arranged obliquely in the direction of rotation of the screw.
Preferably, the tail part of the screw is cylindrical, and the diameter of the tail part of the screw is smaller than or equal to the maximum diameter of the thread body, so that the aim of reducing the resistance of final screwing is fulfilled.
Preferably, the pitch of the thread body is gradually reduced from the head of the screw to the tail of the screw, so that the thread of the interface screw body is sparse to dense from the head to the tail. Furthermore, the distance between the threads close to the head of the screw is larger, so that the shearing effect on the transplanted ligament is reduced, the distance between the threads close to the tail of the screw is smaller, and the fixing effect in a bone tunnel is increased.
Preferably, the thread shape of the thread body is not isosceles trapezoid, and the base angle α of the trapezoid corresponding to the tail side of the screw is larger than the base angle β of the trapezoid corresponding to the head side of the screw. The base angle alpha of one side of the trapezoid, corresponding to the tail part of the screw, is 45-95 degrees, and the base angle beta of one side of the trapezoid, corresponding to the head part of the screw, is 30-60 degrees. When the bottom angle alpha of one side of the tail part of the screw corresponding to the trapezoid is larger than 90 degrees, the tooth-shaped surface of the screw tooth of the screw body is in an inward inclined shape, and the screw tooth can play a role similar to an inverted buckle when the interface screw is screwed in after the ligament is transplanted, so that the fixing effect of the interface screw in the bone tunnel is improved.
The invention has the beneficial effects that:
the blind hole does not need to be additionally arranged, the bone can grow in the interface screw rapidly through the hollow hole formed by the thread body and the main body supporting block, the fixing effect of the interface screw in a bone tunnel is increased, the strength of the thread body part can be increased through the main body supporting block, and the screwing-in is convenient. The thread of the thread body can not generate overlarge shearing force when the screw is screwed in, ligaments can not be damaged, the thread shape of the thread body is in an unequal waist trapezoid shape, the fixation of the interface screw in a bone tunnel can be increased, and particularly when the base angle alpha is larger than 90 degrees, the screw can be fixed in the bone tunnel more strongly under the action of the back-off action generated by the thread.
Drawings
FIG. 1 is a schematic structural view of an interface screw according to the present invention;
FIG. 2 is a schematic cross-sectional view A-A of an interface screw of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a schematic perspective view of an interface screw according to the present invention;
FIG. 5 is a rear view of the interface screw of the present invention;
fig. 6 is a schematic view of the thread shape of the thread body when the back-off action is generated.
In the figure: 1-an interface screw body; 11-screw head; 12-a threaded body; 121-screw teeth; 122-alveolus; 123-a body support block; 124-hollow holes; 13-screw tail; 14-a hollow bore; 141-edge; 142-groove.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-5, the interface screw according to the present invention includes an interface screw body 1, wherein the interface screw body 1 includes a screw head 11, a screw tail 13 and a middle screw body 12, a first end of the screw body 12 is wound around an outer surface of the screw head 11, a second end of the screw body 12 is connected to the screw tail 13, and the screw head 11 and the screw tail 13 are connected to form a whole through the screw body 12.
The thread groove 122 between the adjacent threads 121 on the thread body 12 is hollowed, a plurality of main body supporting blocks 123 are dispersedly arranged on the thread groove 122 to connect the adjacent threads 121, a hollowed hole 124 is formed between the adjacent main body supporting blocks 123 on the same thread groove 122, the bone can grow in the interface screw rapidly through the hollowed hole 124, the fixing effect of the interface screw on a bone tunnel is increased, and no blind hole needs to be additionally arranged.
In a preferred embodiment, three body support blocks 123 are provided for each turn of the socket 122, and the body support blocks 123 on adjacent sockets 122 are staggered with respect to each other, i.e., the body support blocks 123 correspond to the hollow holes 124 in front of and behind the body support blocks 123, rather than to the body support blocks 123 in adjacent sockets 122.
Cavities are arranged on the screw head part 11 and the screw tail part 13, and the cavities on the screw head part 11 and the screw tail part 13 are communicated with the inner cavity of the thread body 12 along the axial direction of the interface screw main body 1 to form a hollow hole 14 of the interface screw main body 1.
The hollow bore 14 of the interface screw body 1 is configured to be contoured to match an external screwdriver. The hollow bore 14 is profiled for use with a special screwdriver. And also facilitates bone growth.
The contour of the hollow hole 14 includes a plurality of raised ribs 141 and grooves 142 between adjacent ribs 141, wherein the ribs 141 forming the contour of the hollow hole 14 on the screw body 12 are formed by protruding the inner side surface of the body support block 123, and the ribs 141 on the screw body 12 are aligned with the ribs 141 of the screw head 11 and the screw tail 13.
The main body supporting block 123 is a columnar structure with a triangular-like cross section, and the diameter of the outer curved surface of the main body supporting block is equal to the maximum diameter of the screw head 11.
In a preferred embodiment, the profile of the hollow bore 14 comprises five ribs 141 and five grooves 142, the grooves 142 being arranged obliquely in the direction of rotation of the screw.
The tail part 13 of the screw is cylindrical, and the diameter of the tail part is smaller than or equal to the maximum diameter of the thread body 12, so that the aim of reducing the resistance of final screwing is fulfilled.
The pitch of the thread of the screw body 12 is gradually reduced from the screw head 11 to the screw tail 13, so that the thread of the interface screw body 1 is sparse to dense from the beginning to the end. Furthermore, the distance between the threads close to the head part 11 of the screw is larger, so that the shearing effect on the transplanted ligament is reduced, and the distance between the threads close to the tail part 13 of the screw is smaller, so that the fixing effect of the screw in the bone tunnel is increased.
The thread 121 of the screw body 12 has a non-isosceles trapezoid shape, and the base angle α of the trapezoid corresponding to the screw tail 13 is greater than the base angle β of the trapezoid corresponding to the screw head 11. The base angle alpha of one side of the trapezoid, corresponding to the screw tail part 13, is 45-95 degrees, and the base angle beta of one side of the trapezoid, corresponding to the screw head part 11, is 30-60 degrees.
In addition, as shown in fig. 6, when the base angle α of the trapezoid corresponding to the screw tail 13 is greater than 90 °, the thread of the thread 12 has an inwardly inclined surface, and the thread 121 performs a back-off function when the interface screw is screwed in after the ligament is transplanted, thereby increasing the fixation function of the interface screw in the bone tunnel.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A novel interface screw comprises an interface screw main body (1) which comprises a screw head part (11), a screw tail part (13) and a middle thread body (12); the first end of the screw body (12) is wound on the outer surface of the screw head (11), the second end of the screw body (12) is connected with the screw tail part (13), and the screw head (11) and the screw tail part (13) are connected into a whole through the screw body (12);
cavities are formed in the screw head (11) and the screw tail (13), the cavities in the screw head (11) and the screw tail (13) are communicated with an inner cavity of the thread body (12) along the axial direction of the interface screw main body (1) to form a hollow hole (14) of the interface screw main body (1), and the hollow hole (14) of the interface screw main body (1) is set to be a profile matched with an external screwdriver;
the method is characterized in that: tooth sockets (122) between adjacent threads (121) on the thread body (12) are hollowed out, a plurality of main body supporting blocks (123) are dispersedly arranged on the tooth sockets (122) to connect the adjacent threads (121), and hollowed holes (124) are formed between the adjacent main body supporting blocks (123) on the same tooth socket (122).
2. The novel interface screw of claim 1, wherein: the profile of the hollow bore (14) includes a plurality of raised ribs (141) and grooves (142) between adjacent ribs (141).
3. The novel interface screw of claim 2, wherein: the profile of the hollow bore (14) comprises five ribs (141) and five grooves (142), the grooves (142) being arranged obliquely in the direction of rotation of the screw.
4. A novel interface screw as claimed in claim 2 or 3, wherein: the ridge (141) forming the outline of the hollow hole (14) on the screw body (12) is formed by protruding the inner side surface of the main body supporting block (123), and the ridge (141) on the screw body (12) is aligned with the ridge (141) of the screw head (11) and the screw tail (13).
5. A novel interface screw as claimed in claim 2 or 3, wherein: the main body supporting block (123) is of a columnar structure with a triangular-like section, and the diameter of the outer curved surface of the main body supporting block is equal to the maximum diameter of the screw head (11).
6. The novel interface screw of claim 1, wherein: the tail part (13) of the screw is cylindrical, and the diameter of the tail part is smaller than or equal to the maximum diameter of the thread body (12).
7. The novel interface screw of claim 1, wherein: the thread pitch of the thread body (12) is gradually reduced from the screw head (11) to the screw tail (13), so that the threads of the interface screw main body (1) are arranged from sparse to dense in the direction from the head to the tail.
8. The novel interface screw of claim 1, wherein: the thread shape of the thread (121) of the thread body (12) is not isosceles trapezoid, and the bottom angle alpha of the trapezoid corresponding to the tail (13) side of the screw is larger than the bottom angle beta of the trapezoid corresponding to the head (11) side of the screw.
9. The novel interface screw of claim 8, wherein: alpha is 45-95 degrees.
10. The novel interface screw of claim 8, wherein: beta is 30-60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110109807.9A CN112754639A (en) | 2021-01-27 | 2021-01-27 | Novel interface screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110109807.9A CN112754639A (en) | 2021-01-27 | 2021-01-27 | Novel interface screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112754639A true CN112754639A (en) | 2021-05-07 |
Family
ID=75706032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110109807.9A Pending CN112754639A (en) | 2021-01-27 | 2021-01-27 | Novel interface screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112754639A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113331932A (en) * | 2021-06-23 | 2021-09-03 | 苏州吉美瑞医疗器械股份有限公司 | Conical screw between ankles |
| CN114259287A (en) * | 2021-12-24 | 2022-04-01 | 北京理贝尔生物工程研究所有限公司 | Intramedullary locking pin assembly |
-
2021
- 2021-01-27 CN CN202110109807.9A patent/CN112754639A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113331932A (en) * | 2021-06-23 | 2021-09-03 | 苏州吉美瑞医疗器械股份有限公司 | Conical screw between ankles |
| CN114259287A (en) * | 2021-12-24 | 2022-04-01 | 北京理贝尔生物工程研究所有限公司 | Intramedullary locking pin assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6315564B1 (en) | Bone implant | |
| US5588838A (en) | Fixture for use in a dental implant system | |
| US8333591B2 (en) | Bionic dental implant | |
| US6273722B1 (en) | Hybrid press fit-threaded dental implant | |
| JP2607876Y2 (en) | Surgical screw | |
| CN112754639A (en) | Novel interface screw | |
| JP4087539B2 (en) | Tensile axial force screw | |
| US9855119B2 (en) | Dental implant fixture | |
| US20150196335A1 (en) | Orthopedic fastener | |
| JPH02246968A (en) | Ligament anchor system and mounting of ligament | |
| NO322525B1 (en) | Micro-threading tour | |
| CN104905859A (en) | Fixing device, fixing method and application method for reconstruction of cruciate ligaments | |
| CN104997540A (en) | Soft tissue fixator for orthopedic operation and soft tissue fixator assembly | |
| CN214857355U (en) | Novel interface screw | |
| KR101027254B1 (en) | A fixture | |
| US20130030479A1 (en) | Bone wedge | |
| CN219109854U (en) | Pulley groove implant | |
| CN209203377U (en) | A kind of soft tissue fixing belt line holdfast | |
| CN209252989U (en) | A kind of soft tissue fixing belt line holdfast | |
| CN108403174B (en) | A kind of anchor apparatus and holdfast system of the loose sclerotin of confrontation | |
| CN220175169U (en) | Anti-reversion expansion interface screw | |
| CN219895891U (en) | Expansion bone nail | |
| CN217744562U (en) | Pressurization bone screw | |
| CN214907501U (en) | Bone screw for ligament repair | |
| CN209864112U (en) | Implant provided with cutting grooves |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |