CN220477643U - Bendable locking intramedullary fixing device - Google Patents
Bendable locking intramedullary fixing device Download PDFInfo
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- CN220477643U CN220477643U CN202321064460.1U CN202321064460U CN220477643U CN 220477643 U CN220477643 U CN 220477643U CN 202321064460 U CN202321064460 U CN 202321064460U CN 220477643 U CN220477643 U CN 220477643U
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- mounting hole
- spiral
- nail rod
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- 241001079814 Symphyotrichum pilosum Species 0.000 claims abstract description 27
- 235000004224 Typha angustifolia Nutrition 0.000 claims abstract description 27
- 241000587161 Gomphocarpus Species 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 2
- 208000010392 Bone Fractures Diseases 0.000 description 16
- 210000000988 bone and bone Anatomy 0.000 description 12
- 238000005452 bending Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 210000004197 pelvis Anatomy 0.000 description 3
- 210000003049 pelvic bone Anatomy 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 210000000689 upper leg Anatomy 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000003414 extremity Anatomy 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 210000003692 ilium Anatomy 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002324 minimally invasive surgery Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 210000002303 tibia Anatomy 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
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- Surgical Instruments (AREA)
Abstract
The utility model relates to the technical field of medical equipment, in particular to a bendable locking intramedullary fixing device. The device comprises: the screw comprises a screw head, wherein one end of the screw head is provided with a first screw section, and a plurality of counter bores are distributed on a screw body of the first screw section; the nail rod is assembled by a plurality of second spiral sections, and a plurality of first perforations are distributed on the spiral body of the second spiral section; the tail seat is provided with a third spiral section at one end, close to the nail rod, of the tail seat, a plurality of second perforations are distributed on the spiral body of the third spiral section, one end, far away from the nail rod, of the tail seat is provided with a mounting hole, the inner diameter of one end, close to the nail rod, of the mounting hole is smaller than that of one end, far away from the nail rod, of the mounting hole, a plurality of adjusting channels are arranged on the inner wall of the mounting hole along the circumferential direction, and the locking piece is in threaded connection with the mounting hole of the tail seat; the flexible cable is fixed in the counter bore at one section, and the other end of the flexible cable passes through the cable channel and then passes out of the adjusting channel; the utility model can adjust the curvature and then lock.
Description
Technical Field
The utility model relates to the technical field of medical equipment, in particular to a bendable locking intramedullary fixing device.
Background
Fracture may occur in straight bones such as femur or in curved bones such as pelvic bone, and fracture fixation is required after reduction of the fracture site during fracture surgery. The manner in which a fracture is fixed is primarily affected by factors such as the fracture type, bone type, and patient health. Fracture fixation can be divided into external fixation and internal fixation, wherein the external fixation is commonly used in fracture fixation operation of pelvis, and the fixation of fracture part is realized by connecting long screws inserted into ilium with frame outside human body. Examples of internal fixation are mainly intramedullary nail fixation by intramedullary implantation and nail plate fixation across the fracture site. In the current minimally invasive reduction fixation operation, the internal fixation mode has more obvious effect.
The fixation operation of implanting intramedullary nails into the intramedullary cavity is popular in straight bones such as femur and tibia, and the stronger mechanical structure can well resist bending and shearing force, so that patients can leave the hospital in a short time. However, the bending nature of the bending bone, such as the pelvic bone, limits the mechanical strength of the straight intramedullary nail in the curved intramedullary cavity, and may even lead to penetration of the screw through the bone and damage to soft tissue. Therefore, there is a strong need for an intramedullary fixation device with bendable properties that can flexibly move in the intramedullary cavity of a bent bone while maintaining good mechanical strength of the intramedullary nail and achieve a stable fixation after locking of the device.
Disclosure of Invention
The utility model aims to provide a bendable locking intramedullary fixing device, which overcomes the defects of the prior art, can flexibly move in the intramedullary cavity of a bent bone while maintaining good mechanical strength of the intramedullary nail, and achieves the effect of stable fixation after the device is locked.
The technical scheme adopted for solving the technical problems is as follows:
a bendable locked intramedullary fixation device comprising:
the screw comprises a screw head, wherein one end of the screw head is provided with a first screw section, the first screw section is at least provided with two layers of screws, a certain gap exists between every two adjacent layers of screws, so that the whole structure is bent and deformed in a small angle, and a plurality of counter bores are distributed on the screws of the first screw section;
the screw rod is formed by assembling a plurality of second screw sections, end sections of two adjacent second screw sections are contacted, one end section of the second screw section close to the screw head is contacted with the end section of the first screw section of the screw head, a plurality of first perforations are distributed on the screw body of the second screw section, and the second screw section is also provided with at least two layers of screw bodies;
the tail seat, one end of the tail seat close to the nail rod is provided with a third spiral section, the end section of the third spiral section is contacted with the end section of the second spiral section close to the third spiral section, a plurality of second perforations are distributed on the spiral body of the third spiral section, one end of the tail seat far away from the nail rod is provided with a mounting hole, the inner diameter of one end of the mounting hole close to the nail rod is smaller than the inner diameter of one end far away from the nail rod, the inner wall of the mounting hole is provided with a plurality of adjusting channels along the circumferential direction, and one end of the mounting hole far away from the nail rod is provided with threads;
the locking piece is in threaded connection with the mounting hole of the tailstock;
after the nail head, the nail rod and the tailstock are assembled, the counter bore, the first perforation and the second perforation form a plurality of cable channels, the positions of the cable channels are in one-to-one correspondence with the positions of the adjusting channels, the number of the flexible cables corresponds to the number of the cable channels, one section of the flexible cable is fixed in the counter bore, and the other end of the flexible cable penetrates through the cable channels and then penetrates out of the adjusting channels;
the locking piece is located first spiral section, second spiral section and second spiral section can finely tune crookedness when the great one end of internal diameter of mounting hole, and flexible cable is fixed by the extrusion when the less one end of internal diameter of locking piece entering mounting hole, and the relative position of first spiral section, second spiral section and third spiral section is fixed.
Furthermore, the outer wall of the nail head is provided with a conical thread and a self-tapping groove, the structure of the nail head is the same as that of a traditional self-tapping conical head screw, and when the intramedullary fixing device is rotationally pushed in an intramedullary channel, the structure of the conical thread can ensure that the position of the device in a intramedullary cavity is firmer and more stable, and the falling and the position dislocation are avoided; the pin head is provided with a guide wire through hole along the axial direction, and the guide wire through hole is used for providing a movable channel for the guide wire, so that the guide wire cannot deviate when being pushed into the intramedullary fixation device along the guide wire path.
Further, one end of the tailstock, which is far away from the nail rod, is provided with a hexagonal groove, and one end of the locking piece, which is far away from the nail rod, is also provided with a hexagonal groove.
Further, the cable channels are provided with 4.
Further, one end of the locking piece, which is close to the nail rod, is of an arc surface structure, so that the flexible cable is more conveniently extruded to realize locking and fixing of the device, and meanwhile unnecessary damage to the flexible cable can be avoided.
The flexible cable can slide along the bending of the device in the cable channel and the adjusting channel at will when the flexible cable is in a relaxed state, and when the flexible locking intramedullary fixing device moves to a proper position in the intramedullary cavity, a locking piece is placed in the mounting hole of the tailstock. Corresponding hexagonal wrenches are respectively arranged on the hexagonal grooves of the tailstock and the locking piece, the tailstock is fixed to rotate the locking piece by utilizing the antagonism of the tailstock and the locking piece, the locking piece slides towards the inside of the mounting hole when rotating under the meshing action of internal and external threads, and when the locking piece moves to the part with smaller inner diameter of the mounting hole, the arc-shaped side wall surface at the front end of the locking piece is used for extruding the flexible cable to finish locking and fixing of the device.
The beneficial effects of the utility model are as follows: compared with the prior art, the bendable locking intramedullary fixing device has the following advantages: the minimally invasive surgical device is suitable for fracture fixation of pelvis bending bones and limb long bones, provides a minimally invasive surgical treatment scheme capable of being fixed in marrow for bending bone fracture, can achieve a surgical effect more simply and conveniently, saves surgical time, fully plays the advantages of small trauma and quick recovery of the minimally invasive surgery of orthopaedics, and can be inserted into an internal marrow cavity and conform to a bending path in a flexible state; while in a rigid state, the device can support the tensile and vertical shear stresses required to fix the fracture; by using the intramedullary fixation device that can be switched between flexible and rigid states, mechanical fixation problems of the curved bones of the pelvis, etc. during internal fracture fixation procedures can be minimized or eliminated.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic view of the structure of the nail head of the present utility model;
FIG. 3 is a schematic view of another angular configuration of the stud of the present utility model;
FIG. 4 is a schematic cross-sectional view of the structure of the stud of the present utility model;
FIG. 5 is a schematic view of the structure of a second thread segment according to the present utility model;
FIG. 6 is a schematic view of the structure of the present utility model after a plurality of second thread segments are connected;
FIG. 7 is a cross-sectional view of FIG. 6 in accordance with the present utility model;
FIG. 8 is a schematic view of the tailstock of the present utility model;
FIG. 9 is a schematic view of another angular configuration of the tailstock of the present utility model;
FIG. 10 is a cross-sectional view of the tailstock of the present utility model;
FIG. 11 is a schematic view of the structure of the locking member of the present utility model;
FIG. 12 is a schematic view showing the structure of the locking member of the present utility model in a state of being retracted into the flexible cable;
the flexible cable comprises a 1-head, a 101 first spiral section, a 102 counter bore, 103 conical threads, 104 self-tapping grooves, 105 guide wire through holes, 2 screw rods, 201 second spiral sections, 202 first perforations, 3 tailstocks, 301 third spiral sections, 302 second perforations, 303 mounting holes, 304 adjusting channels, 4 locking pieces, 401 cambered surface structures and 5 flexible cables.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
In the embodiment shown in fig. 1-12, a bendable locked intramedullary fixation device includes:
the novel screw comprises a screw head 1, wherein one end of the screw head 1 is provided with a first screw section 101, the first screw section 101 is provided with at least two layers of screws, a certain gap is reserved between every two adjacent layers of screws, so that the whole structure is bent and deformed in a small angle, and a plurality of counter bores 102 are distributed on the screws of the first screw section 101;
the nail rod 2 is formed by assembling a plurality of second spiral sections 201, end sections of two adjacent second spiral sections 201 are contacted, one end section of the second spiral section 201 close to the nail head 1 is contacted with the end section of the first spiral section 101 of the nail head 1, a plurality of first perforations 202 are distributed on a spiral body of the second spiral section 201, and the second spiral section 201 is also provided with at least two layers of spiral bodies;
the tail seat 3, one end of the tail seat 3 close to the nail rod 2 is provided with a third spiral section 301, an end section of the third spiral section 301 is contacted with an end section of a second spiral section 201 close to the third spiral section 301, a plurality of second perforations 302 are distributed on a spiral body of the third spiral section 301, one end of the tail seat 3 far away from the nail rod 2 is provided with a mounting hole 303, the inner diameter of one end of the mounting hole 303 close to the nail rod 2 is smaller than the inner diameter of one end far away from the nail rod 2, a plurality of adjusting channels 304 are arranged on the inner wall of the mounting hole 303 along the circumferential direction, and one end of the mounting hole 303 far away from the nail rod 2 is provided with threads 305;
a locking piece 4, wherein the locking piece 4 is in threaded connection with the mounting hole 303 of the tailstock 3;
after the nail head 1, the nail rod 2 and the tailstock 3 are assembled, the counter bore 102, the first perforation 202 and the second perforation 302 form a plurality of cable channels, the positions of the cable channels are in one-to-one correspondence with the positions of the adjusting channels 304, the number of the flexible cables 5 corresponds to the number of the cable channels, one section of the flexible cables 5 is fixed in the counter bore 102, and the other end of the flexible cables 5 penetrates through the cable channels and then penetrates out of the adjusting channels 304;
the first spiral section 101, the second spiral section 201 and the second spiral section 201 can be finely adjusted in curvature when the locking piece 4 is located at one end with a larger inner diameter of the mounting hole 303, the flexible cable 5 is extruded and fixed when the locking piece 4 enters the one end with a smaller inner diameter of the mounting hole 303, and the relative positions of the first spiral section 101, the second spiral section 201 and the third spiral section 301 are fixed.
In this embodiment, the outer wall of the nail head 1 is provided with a tapered thread 103 and a self-tapping groove 104, which has the same structure as a conventional self-tapping taper head screw, and when the intramedullary fixing device is rotationally pushed in the intramedullary channel, the structure of the tapered thread 103 can ensure that the position of the device in the intramedullary cavity is more firm and stable, and the falling and the position dislocation are avoided; the pin head 1 is provided with a guide wire through hole 105 along its axial direction, which is used for providing a movable channel for the guide wire, ensuring that no deflection occurs when pushing the intramedullary fixation device along the guide wire path.
In this embodiment, the end of the tailstock 3 away from the pin rod 2 is provided with a hexagonal groove, and the end of the locking member away from the pin rod 2 is also provided with a hexagonal groove.
In this embodiment, 4 cable channels are provided.
In this embodiment, the end of the locking member 4 near the pin 2 is a cambered surface structure 401, which is more convenient for extruding the flexible cable 5 to realize locking and fixing of the device, and meanwhile, unnecessary damage to the flexible cable 5 can be avoided.
In this embodiment, in the flexible relaxed state of the intramedullary fixation device, the intermediate section of the device has small gaps between the first thread segments, the second thread segments, and the third thread segments, respectively, and the gaps can be freely bent and changed within a certain angular range by stretching and bending the gaps; after the angle position of the intramedullary fixing device is adjusted, the locking piece 4 of the tailstock 3 is adjusted, so that the locking and fixing of the device can be realized; when in use, after the fracture is reduced, the guide wire is used for penetrating through the fracture position in the intramedullary cavity of the bent bone, an intramedullary channel is established along the guide wire path, and finally the intramedullary fixing device is pushed into the intramedullary channel along the guide wire path, so that the intramedullary fixing device is locked and fixed after the intramedullary fixing device reaches a proper position.
The foregoing embodiments are merely examples of the present utility model, and the scope of the present utility model includes, but is not limited to, the forms and styles of the foregoing embodiments, and any suitable changes or modifications made by those skilled in the art, which are consistent with the claims of the present utility model, shall fall within the scope of the present utility model.
Claims (7)
1. A bendable locked intramedullary fixation device, comprising:
the screw comprises a screw head, wherein one end of the screw head is provided with a first screw section, and a plurality of counter bores are distributed on a screw body of the first screw section;
the screw rod is formed by assembling a plurality of second screw sections, end section surfaces of two adjacent second screw sections are contacted, one end section surface of the second screw section close to the screw head is contacted with the end section surface of the first screw section of the screw head, and a plurality of first perforations are distributed on the screw body of the second screw section;
the tail seat, one end of the tail seat close to the nail rod is provided with a third spiral section, the end section of the third spiral section is contacted with the end section of the second spiral section close to the third spiral section, a plurality of second perforations are distributed on the spiral body of the third spiral section, one end of the tail seat far away from the nail rod is provided with a mounting hole, the inner diameter of one end of the mounting hole close to the nail rod is smaller than the inner diameter of one end far away from the nail rod, the inner wall of the mounting hole is provided with a plurality of adjusting channels along the circumferential direction, and one end of the mounting hole far away from the nail rod is provided with threads;
the locking piece is in threaded connection with the mounting hole of the tailstock;
after the nail head, the nail rod and the tailstock are assembled, the counter bore, the first perforation and the second perforation form a plurality of cable channels, the positions of the cable channels are in one-to-one correspondence with the positions of the adjusting channels, the number of the flexible cables corresponds to the number of the cable channels, one section of the flexible cable is fixed in the counter bore, and the other end of the flexible cable penetrates through the cable channels and then penetrates out of the adjusting channels;
the locking piece is located first spiral section, second spiral section and second spiral section can finely tune crookedness when the great one end of internal diameter of mounting hole, and flexible cable is fixed by the extrusion when the less one end of internal diameter of locking piece entering mounting hole, and the relative position of first spiral section, second spiral section and third spiral section is fixed.
2. A bendable locked intramedullary fixation device of claim 1, wherein the outer wall of the nail head is provided with tapered threads and self-tapping grooves.
3. A bendable locked intramedullary fixation device as claimed in claim 1, wherein the head is provided with a guidewire through hole along its axial direction.
4. The bendable locked intramedullary fixation device of claim 1, wherein the end of the tailstock distal from the shank is provided with a hexagonal recess, and the end of the locking member distal from the shank is also provided with a hexagonal recess.
5. The bendable locked intramedullary fixation device of claim 1, wherein the cable channel is provided with 4 cable channels.
6. The bendable locked intramedullary fixation device of claim 1, wherein the locking member has a cambered surface at an end thereof adjacent to the shank.
7. The bendable locked intramedullary fixation device of claim 1, wherein the flexible cable is a flexible cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321064460.1U CN220477643U (en) | 2023-05-06 | 2023-05-06 | Bendable locking intramedullary fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321064460.1U CN220477643U (en) | 2023-05-06 | 2023-05-06 | Bendable locking intramedullary fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220477643U true CN220477643U (en) | 2024-02-13 |
Family
ID=89833630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321064460.1U Active CN220477643U (en) | 2023-05-06 | 2023-05-06 | Bendable locking intramedullary fixing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220477643U (en) |
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2023
- 2023-05-06 CN CN202321064460.1U patent/CN220477643U/en active Active
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