CN219700077U - Flexible triangular support femoral intramedullary nail system - Google Patents
Flexible triangular support femoral intramedullary nail system Download PDFInfo
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- CN219700077U CN219700077U CN202121542265.6U CN202121542265U CN219700077U CN 219700077 U CN219700077 U CN 219700077U CN 202121542265 U CN202121542265 U CN 202121542265U CN 219700077 U CN219700077 U CN 219700077U
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- screw
- tail
- nail
- transverse tension
- lag screw
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- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000035876 healing Effects 0.000 abstract description 5
- 208000005214 Poroma Diseases 0.000 abstract description 4
- 201000001013 eccrine acrospiroma Diseases 0.000 abstract description 4
- 230000000638 stimulation Effects 0.000 abstract description 3
- 239000007943 implant Substances 0.000 abstract description 2
- 230000000399 orthopedic effect Effects 0.000 abstract description 2
- 208000010392 Bone Fractures Diseases 0.000 description 15
- 206010017076 Fracture Diseases 0.000 description 15
- 210000000689 upper leg Anatomy 0.000 description 6
- 206010020100 Hip fracture Diseases 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UZUFPBIDKMEQEQ-UHFFFAOYSA-N perfluorononanoic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F UZUFPBIDKMEQEQ-UHFFFAOYSA-N 0.000 description 2
- LMRJHNFECNKDKH-UHFFFAOYSA-N 4-(trifluoromethyl)nicotinic acid Chemical compound OC(=O)C1=CN=CC=C1C(F)(F)F LMRJHNFECNKDKH-UHFFFAOYSA-N 0.000 description 1
- 206010020649 Hyperkeratosis Diseases 0.000 description 1
- 210000001185 bone marrow Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000020089 femoral neck fracture Diseases 0.000 description 1
- 210000002436 femur neck Anatomy 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Abstract
The utility model discloses a flexible triangular support femoral intramedullary nail system, which belongs to the technical field of orthopedic implants and comprises a main nail, a bevel lag screw and a transverse tension screw, wherein a first nail hole for accommodating the bevel lag screw and a second nail hole for accommodating the transverse tension screw are formed in the main nail, at least one of the bevel lag screw and the transverse tension screw is of a hollow structure, and a screw groove is formed in the rod part of the main nail. The flexible triangular support femoral intramedullary nail system has elasticity of the lag screw and/or the transverse tension screw, can increase biological stimulation of the fracture end, is beneficial to poroma growth and healing of the fracture end, and simultaneously avoids loosening or breaking internal fixation.
Description
Technical Field
The utility model relates to the technical field of orthopedic implants, in particular to a flexible triangular support femoral intramedullary nail system.
Background
The proximal intramedullary nail is mainly used for intertrochanteric fracture and high-level subtrochanteric fracture. The traditional proximal femur intramedullary nail fixation mainly comprises proximal femur intramedullary nails (PFNs), novel proximal femur internal fixation systems (Proximal femoral nail antirotation, PFNA), a Shandong Wei high orthopaedics intramedullary nail system TFNA and the like, wherein the PFNA is a novel and improved PFN system, and is suitable for various types of intertrochanter fracture, subintertrochanter fracture, basal fracture of femoral neck, folding and doubling of femoral neck fracture, merging of intertrochanter fracture and femoral shaft fracture and the like.
In recent years, a triangular support intramedullary nail design has emerged, as shown in fig. 1, which includes a main nail 1 'for implantation into the femoral medullary cavity, a lag screw 2' (lag screw) passing through the upper portion of the main nail 1', and a lateral tension screw 3' (lag screw) passing through the top of the main nail 1 'and the lag screw 2', which has the advantage of moving inward in the fulcrum, distributing pressure on both the lag screw and the lag screw, but because of its excessively strong design, the fracture end lacks biostimulation, which is detrimental to callus growth and healing of the fracture end, and may cause loosening or fracture of the internal fixation.
Disclosure of Invention
The utility model aims to provide a flexible triangular support femoral intramedullary nail system which is beneficial to poroma growth and fracture end healing.
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model provides a flexible triangle supports femoral intramedullary nail system, includes main nail, lag screw and horizontal tension screw, be equipped with on the main nail and be used for holding the first nail hole of lag screw and be used for holding the second nail hole of horizontal tension screw, at least one of lag screw and horizontal tension screw is hollow structure and pole portion is equipped with the helicla flute.
Further, the helix angle of the spiral groove is 20-60 degrees.
Further, the spiral line of the spiral groove is a straight line with a trapezoid wave only at one side after being unfolded, and the length of the upper bottom of the trapezoid is larger than that of the lower bottom;
or the spiral line of the spiral groove is a straight line with corrugation on one side only after being unfolded;
or the spiral line of the spiral groove is a straight line after being unfolded;
or the helix of the helical groove is unfolded to form a forward rectangular wave;
or the spiral line of the spiral groove is a wavy line after being unfolded.
Furthermore, the oblique tension screw is of a hollow structure, the rod part of the oblique tension screw is provided with a spiral groove, and the tail part of the oblique tension screw is connected with a locking screw in the hollow structure through threads.
Further, the tail end of the transverse tension screw is provided with external threads.
Further, the tail end of the transverse tension screw is provided with a conical surface which gradually narrows from the tail to the head.
Further, the tail part of the main nail is provided with a tail cap for fixing the transverse tension screw.
Further, a threaded hole communicated with the second nail hole is formed in the tail end face of the main nail, the tail cap is in threaded connection with the threaded hole, and the lower end face of the tail cap extrudes the rod portion of the transverse tension screw.
Further, a threaded section matched with the threaded hole is arranged in the middle of the tail cap, and a polish rod is arranged at the lower part of the tail cap.
Further, the first nail hole comprises a threaded connection section close to the tail of the lag screw, and the tail of the lag screw is provided with a threaded section matched with the threaded connection section.
Further, the first nail hole further comprises a smooth hole section far away from the tail part of the lag screw, and the middle part of the lag screw is a polished rod.
The utility model has the following beneficial effects:
the flexible triangular support femoral intramedullary nail system comprises a main nail, a lag screw and a transverse tension screw, wherein a first nail hole for accommodating the lag screw and a second nail hole for accommodating the transverse tension screw are formed in the main nail, at least one of the lag screw and the transverse tension screw is of a hollow structure, and a screw groove is formed in the rod part of the screw; compared with the prior art, the oblique tension screw and/or the transverse tension screw have elasticity, can increase the biological stimulation of the fracture end, is beneficial to poroma growth and fracture end healing, and simultaneously avoids internal fixation loosening or fracture.
Drawings
FIG. 1 is a schematic diagram of a prior art triangular support intramedullary nail design;
FIG. 2 is a schematic view showing the overall structure of the flexible triangular support femoral intramedullary nail system of the present utility model;
FIG. 3 is a schematic view of the structure of the main nail in the flexible triangular support femoral intramedullary nail system of the present utility model;
FIG. 4 is a schematic view of the construction of a lag screw in the flexible triangular-buttress femoral intramedullary nail system of the present utility model, wherein (a) is a front view and (b) is a cross-sectional view;
FIG. 5 is a schematic view of the structure of a transverse tension screw in the flexible triangular-buttress femoral intramedullary nail system of the present utility model, wherein (a) is a front view and (b) is a cross-sectional view;
FIG. 6 is a schematic view of the structure of the flexible triangular support femoral intramedullary nail system of the present utility model after the spiral of the helical groove is deployed;
fig. 7 is a schematic structural view of a tail cap in the flexible triangular-buttress femoral intramedullary nail system of the present utility model, wherein (a) is a front view and (b) is a perspective view.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The utility model provides a flexible triangular support femoral intramedullary nail system, which comprises a main nail 1, a lag screw 2 (called as a lag screw for short) and a transverse tension screw 3 (called as a transverse screw for short), wherein a first nail hole 11 for accommodating the lag screw 2 and a second nail hole 12 for accommodating the transverse tension screw 3 are arranged on the main nail 1, at least one of the lag screw 2 and the transverse tension screw 3 is of a hollow structure, and the rod part is provided with spiral grooves 21 and 31, so that the screw has elasticity.
In the embodiment shown in the figures, the lag screw 2 and the lateral tension screw 3 are hollow structures and the rod parts are provided with spiral grooves 21 and 31, and it is understood that only one of the spiral grooves can be provided; the lag screw 2 is provided with a third screw hole 22 for receiving the lateral tension screw 3.
When the screw is used, the main screw 1 is firstly held by using a surgical tool, the treated femoral bone marrow cavity is inserted, then the oblique lag screw 2 is penetrated through the first screw hole 11 on the main screw 1 for installing the oblique lag screw 2 by using the surgical tool, and the transverse tension screw 3 is penetrated through the second screw hole 12 on the main screw 1 for installing the transverse tension screw 3 and the third screw hole 22 on the oblique lag screw 2 for accommodating the transverse tension screw 3 by using the surgical tool, so that the implantation is finished.
The flexible triangular support femoral intramedullary nail system comprises a main nail, a lag screw and a transverse tension screw, wherein a first nail hole for accommodating the lag screw and a second nail hole for accommodating the transverse tension screw are formed in the main nail, at least one of the lag screw and the transverse tension screw is of a hollow structure, and a screw groove is formed in the rod part of the screw; compared with the prior art, the oblique tension screw and/or the transverse tension screw have elasticity, can increase the biological stimulation of the fracture end, is beneficial to poroma growth and fracture end healing, and simultaneously avoids internal fixation loosening or fracture. The utility model is mainly suitable for intertrochanteric fracture and high-position subtrochanteric fracture in surgical operation.
In order to provide the lag screw 2 and the lateral tension screw 3 with a good elasticity, the helix angle of the helical grooves 21, 31 is preferably 20-60 degrees, more preferably 30-50 degrees, for example 35 degrees, 40 degrees, 45 degrees, etc.
The helix of the helical grooves 21, 31 can take various forms as will be readily appreciated by those skilled in the art, the present utility model preferably taking the following forms:
as shown in fig. 6 (a), the spiral lines of the spiral grooves 21, 31 are developed to be straight lines having trapezoidal waves on only one side, and the length of the upper base of the trapezoid is longer than that of the lower base, so that the strength and the elasticity of the screw can be best considered;
alternatively, as shown in fig. 6 (b), the spiral lines of the spiral grooves 21, 31 are developed to be straight lines having positive corrugations on only one side;
alternatively, as shown in fig. 6 (c), the spiral lines of the spiral grooves 21, 31 are straight after being developed;
alternatively, as shown in fig. 6 (d), the spiral lines of the spiral grooves 21, 31 are unfolded to be a positive rectangular wave;
alternatively, as shown in fig. 6 (e), the spiral lines of the spiral grooves 21, 31 are wavy lines after being stretched.
When the lag screw 2 is of a hollow structure and the screw groove 21 is formed in the rod portion, the tail portion of the lag screw 2 is preferably in threaded connection with a locking screw 25 in the hollow structure, and the locking screw 25 can improve the strength of the rod portion of the lag screw 2 and can enable the lag screw 2 to be locked in the second screw hole 12 of the main screw 1 more firmly.
As shown in fig. 5, to improve the securement between the lateral tension screw 3 and the femur, the trailing end of the lateral tension screw 3 may be provided with external threads 32. Moreover, the tail end of the transverse tension screw 3 may be provided with a tapered surface that gradually narrows from the tail end to the head end (i.e., from left to right in fig. 5), so that as the transverse tension screw 3 is screwed into the femur, the tapered surface at the tail end of the transverse tension screw 3 gradually tightens against the surface of the femur, eventually achieving a tight fit. The head of the lateral tension screw 3 is usually provided with a threaded section 33 to enhance the fixing effect.
As shown in fig. 2-3 and 7, to lock the lateral tension screw 3 with the main nail 1 as one body, the tail of the main nail 1 may be provided with a tail cap 13 for fixing the lateral tension screw 3.
Further, in order to fix the lateral tension screw 3 by the tail cap 13, various means which can be easily conceived by those skilled in the art may be adopted, for example, the rod portion of the lateral tension screw 3 is provided with a pin hole, the tail cap is inserted into the pin hole, and the like. The utility model preferably adopts the following modes:
the tail end surface of the main nail 1 is provided with a threaded hole 14 communicated with the second nail hole 12, the tail cap 13 is in threaded connection with the threaded hole 14, and the lower end surface of the tail cap 13 presses the rod part of the transverse tension screw 3, so that the later disassembly can be facilitated; the tail cap is required to be used for sealing the conventional main nails, and the main nails are only used for preventing bone from growing in; the tail cap 13 can be directly in compression fit with the transverse tension screw 3, and finally the transverse tension screw 3 is locked on the main screw 1, so that the main screw 1, the oblique tension screw 2 and the transverse tension screw 3 are finally locked into an integral structure. Preferably, the middle part of the tail cap 13 is provided with a threaded section 131 matched with the threaded hole 14, so that the tail cap 13 is screwed into the threaded hole 14 through the threaded section 131 and is in threaded locking with the threaded hole 14; the lower part of the tail cap 13 is a polish rod 132, which facilitates rapid guiding of the tail cap 13 into the threaded bore 14.
As shown in fig. 3-4, the first nail hole 11 of the main nail 1 for accommodating the lag screw 2 may include a threaded connection section (not shown) near the tail (i.e., left side in fig. 4) of the lag screw 2, and the tail of the lag screw 2 is provided with a threaded section 23 matched with the threaded connection section, so that the lag screw 2 is screwed into the first nail hole 11 through the threaded section 23 of the tail and is screwed with the first nail hole 11, thereby not only ensuring the self anti-withdrawing effect, but also better providing axial supporting force for the transverse tension screw 3 and further providing effective support for the transverse tension screw 3.
Further, the first nail hole 11 may further include a smooth hole section far away from the tail of the lag screw 2, and the middle of the lag screw 2 is a polished rod, so that the smooth hole section is matched with the polished rod, and the circumferential stability of the lag screw 2 can be limited, so that the lag screw 2 is accurately matched with the transverse tension screw 3. The head of the lag screw 2 can be provided with a thread section 24, the thread section 24 can be designed by adopting a bone thread, and as the thread pitch of the bone thread is slightly larger, the screwing process of the lag screw 2 has a certain traction effect on the femoral head, and the fixing effect and the postoperative fusion are better.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (8)
1. The flexible triangular support femoral intramedullary nail system is characterized by comprising a main nail, a lag screw and a transverse tension screw, wherein a first nail hole for accommodating the lag screw and a second nail hole for accommodating the transverse tension screw are arranged on the main nail, at least one of the lag screw and the transverse tension screw is of a hollow structure, a spiral groove is formed in the rod part of the screw, and the spiral angle of the spiral groove is 20-60 degrees;
the spiral line of the spiral groove is a straight line with a trapezoid wave only at one side after being unfolded, and the length of the upper bottom of the trapezoid is larger than that of the lower bottom;
or the spiral line of the spiral groove is a straight line with corrugation on one side only after being unfolded;
or the helix of the helical groove is unfolded to form a forward rectangular wave;
or the spiral line of the spiral groove is a wavy line after being unfolded.
2. The flexible delta-buttress femoral intramedullary nail system of claim 1, wherein the lag screw is hollow and the shaft portion is provided with a helical groove, and the tail of the lag screw is threaded with a locking screw within the hollow.
3. The flexible delta-buttress femoral intramedullary nail system of claim 1, wherein the tail end of the transverse tension screw is provided with external threads.
4. A flexible delta-buttress femoral intramedullary nail system according to claim 3, wherein the tail end of the transverse tension screw is provided with a tapered surface which tapers along the tail portion towards the head portion.
5. The flexible delta-buttress femoral intramedullary nail system of claim 1, wherein the tail of the main nail is provided with a tail cap for securing the transverse tension screw.
6. The flexible triangular support femoral intramedullary nail system according to claim 5, wherein a threaded hole is provided in the tail end surface of the main nail in communication with the second nail hole, the tail cap is threaded into the threaded hole, and the lower end surface of the tail cap presses against the stem of the transverse tension screw.
7. The flexible delta-buttress femoral intramedullary nail system of claim 6, wherein a threaded section is provided in the middle of said tail cap that mates with said threaded bore, and wherein the lower portion of said tail cap is a polished rod.
8. The flexible delta-buttress femoral intramedullary nail system of any one of claims 1-7, wherein the first nail hole comprises a threaded connection section near the lag screw tail and a smooth hole section remote from the lag screw tail, the lag screw tail is provided with a threaded section that mates with the threaded connection section, and the middle of the lag screw is a polished rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121542265.6U CN219700077U (en) | 2021-07-07 | 2021-07-07 | Flexible triangular support femoral intramedullary nail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121542265.6U CN219700077U (en) | 2021-07-07 | 2021-07-07 | Flexible triangular support femoral intramedullary nail system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219700077U true CN219700077U (en) | 2023-09-19 |
Family
ID=87978655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121542265.6U Active CN219700077U (en) | 2021-07-07 | 2021-07-07 | Flexible triangular support femoral intramedullary nail system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219700077U (en) |
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2021
- 2021-07-07 CN CN202121542265.6U patent/CN219700077U/en active Active
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