CN220001893U - Femoral intramedullary nail capable of preventing nail backing - Google Patents
Femoral intramedullary nail capable of preventing nail backing Download PDFInfo
- Publication number
- CN220001893U CN220001893U CN202321585786.9U CN202321585786U CN220001893U CN 220001893 U CN220001893 U CN 220001893U CN 202321585786 U CN202321585786 U CN 202321585786U CN 220001893 U CN220001893 U CN 220001893U
- Authority
- CN
- China
- Prior art keywords
- nail
- hole
- tension screw
- screw
- femur
- 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.)
- Active
Links
- 210000000689 upper leg Anatomy 0.000 claims description 12
- 210000000988 bone and bone Anatomy 0.000 claims description 3
- 230000006837 decompression Effects 0.000 description 7
- 238000004873 anchoring Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 206010048886 Onychoclasis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Surgical Instruments (AREA)
Abstract
The utility model relates to the technical field of devices for femoral heads, in particular to a femoral intramedullary nail capable of preventing nail withdrawal, which comprises a main nail, an oblique tension screw and a transverse tension screw, wherein a first nail hole for accommodating the oblique tension screw and a second nail hole for accommodating the transverse tension screw are respectively arranged on the main nail, a third nail hole for accommodating the transverse tension screw is also arranged on the oblique tension screw, the transverse tension screw is in clearance fit with the third nail hole, the femoral intramedullary nail further comprises a locking sleeve, the locking sleeve is arranged in the second nail hole, the locking sleeve is provided with a first internal threaded hole for accommodating the transverse tension screw, the first internal threaded hole is formed along the length direction of the locking sleeve, and the rod part of the transverse tension screw is provided with an external thread section matched with the first internal threaded hole. The femoral intramedullary nail is characterized in that the main nail, the transverse tension screw and the tail cap are stably connected together by additionally arranging the locking sleeve, so that the transverse tension screw is effectively prevented from backing out, and the stability of the intramedullary nail is ensured.
Description
Technical Field
The utility model relates to the technical field of devices for femoral heads, in particular to a femoral intramedullary nail capable of preventing nail withdrawal.
Background
An intramedullary nail belongs to an orthopedic internal fixation device in a medical device, and comprises a main nail, a transverse tension screw and an oblique tension screw to form a triangular support structure. The triangle bearing structure of PFBN stably relies on the tail cap of main nail upper end to compress tightly the transverse tension screw of proximal end, because tail cap and transverse tension screw are rigid structure, be the point (approximate line) contact when two contact are joined in marriage, even screw up the tail cap in the art, also cause the not hard up of tail cap very easily after the art, transverse tension screw is not hard up even the nail that moves back, and then influences whole triangle bearing structure's stability.
Through retrieving, the patent with the publication number of CN113729903A discloses a femur intramedullary nail fixing system, which comprises a main nail, a diagonal tension screw and a transverse tension screw, wherein a third nail hole for accommodating the transverse tension screw is arranged on the diagonal tension screw, and the transverse tension screw is in clearance fit with the third nail hole, so that the transverse tension screw is conveniently matched with the diagonal tension screw, and the force distribution is more balanced. In the actual operation process, it is found that the clearance fit between the transverse tension screw and the third nail hole can cause poor stability of the triangular support structure, and the problem that the transverse tension screw loosens or even withdraws nails is not solved, so that a structure capable of further locking the transverse tension screw and the main nail is urgently needed.
Disclosure of Invention
In order to solve the problem that the stability of a triangular support structure is affected due to the fact that an existing transverse tension screw is easy to withdraw, the utility model provides the femur intramedullary nail capable of preventing withdrawal of the screw.
The utility model provides a femoral intramedullary nail capable of preventing nail withdrawal, which comprises a main nail, an oblique tension screw and a transverse tension screw, wherein a first nail hole for accommodating the oblique tension screw and a second nail hole for accommodating the transverse tension screw are respectively arranged on the main nail, a third nail hole for accommodating the transverse tension screw is also arranged on the oblique tension screw, the transverse tension screw is in clearance fit with the third nail hole, the femoral intramedullary nail further comprises a locking sleeve, the locking sleeve is arranged in the second nail hole, the locking sleeve is provided with a first internal threaded hole for accommodating the transverse tension screw, the first internal threaded hole is formed along the length direction of the locking sleeve, and the rod part of the transverse tension screw is provided with an external thread section matched with the first internal threaded hole. The locking sleeve in threaded connection is used for fixing the relative positions of the transverse tension screw and the main screw, so that the phenomenon of screw withdrawal of the transverse tension screw is effectively prevented.
Further, the main nail is provided with a proximal end and a distal end, the proximal end of the main nail is provided with a fourth nail hole, the fourth nail hole is communicated with the second nail hole, and a tail cap is arranged in the fourth nail hole. And limiting the transverse tension screw from the longitudinal direction through the tail cap.
Further, the locking sleeve is further provided with a second internal threaded hole for accommodating the tail cap, the second internal threaded hole is perpendicular to the first internal threaded hole, and the tail cap sequentially penetrates through the fourth nail hole and the second internal threaded hole to be abutted against a transverse tension screw arranged in the first internal threaded hole. The tail cap is fixed through the locking sleeve, so that the tail cap is prevented from falling out of the fourth nail hole.
Further, the locking sleeve comprises a sleeve and a guide plate, and the guide plate is arranged at one end, far away from the third nail hole, of the sleeve. The transverse tension screw is convenient to extend in through the arrangement of the guide plate.
Further, the guide plate is provided with a first end face abutting against the outer wall of the main nail and a second end face used for the transverse tension screw to extend in, wherein the first end face is a plane, and the second end face is an arc face. The first end face is convenient for the guide plate to be abutted against the outer wall of the main nail, and the second end face is convenient for the screw to extend into.
Further, an inner concave decompression plane is arranged on the outer wall of the main nail, which is abutted against the first end face, and the first end face is abutted against the decompression plane. The decompression plane is matched with the plane design of the first end face, and the locking effect is good.
Further, limiting planes are arranged on two sides of the locking sleeve, a guiding plane matched with the limiting planes is arranged on the inner wall of the second nail hole, and a limiting step is formed at one end, close to the third nail hole, of the guiding plane. Through the cooperation of spacing plane and direction plane, can avoid the rotation of lock sleeve.
Further, an elastic limiting hook matched with the limiting step is further arranged on the limiting plane, and elastic grooves are formed in two sides of the elastic limiting hook. The locking sleeve is limited in the second nail hole through the cooperation of the elastic limiting hook and the limiting step.
Further, the distal end of the main pin is also provided with a locking hole for receiving an interlocking bone screw. Facilitating distal positioning of the intramedullary nail.
Further, the head of the transverse tension screw is provided with a screw blade, and the screw blade is arranged at the periphery of the transverse tension screw. The helical blade has a large surface area and the anchoring force is increased by the rotary screwing.
The utility model has the beneficial effects that:
the utility model provides a femoral intramedullary nail capable of preventing nail withdrawal, which realizes the fixation of the relative positions among a main nail, a transverse tension screw and a tail cap by additionally arranging a locking sleeve, can effectively prevent the phenomenon of nail withdrawal after operation, ensures the stability of the intramedullary nail and quickens recovery.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of a femoral intramedullary nail;
FIG. 2 is a schematic structural view of a locking sleeve;
FIG. 3 is a first angular schematic view of the main staple;
FIG. 4 is a second angular schematic view of the main staple;
in the drawing, 1, a main nail, 11, a first nail hole, 12, a second nail hole, 121, a guide plane, 122, a limit step, 13, a third nail hole, 14, a fourth nail hole, 15, a locking hole, 16, a proximal end, 17, a distal end, 18, a decompression plane, 2, a lag screw, 3, a transverse tension screw, 31, an external thread section, 32, a screw blade, 4, a tail cap, 5, a locking sleeve, 51, a first internal thread hole, 52, a second internal thread hole, 53, a sleeve, 54, a guide plate, 541, a first end face, 542, a second end face, 55, a limit plane, 56, an elastic limit hook, 57 and an elastic groove.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown.
In order to prevent the lateral tension screw 3 from backing out, a femoral intramedullary nail capable of preventing backing out is designed, as shown in fig. 1, the femoral intramedullary nail comprises a main nail 1, a lag screw 2 and a lateral tension screw 3, wherein a first nail hole 11 for accommodating the lag screw 2 and a second nail hole 12 for accommodating the lateral tension screw 3 are respectively arranged on the main nail 1, a third nail hole 13 for accommodating the lateral tension screw 3 is also arranged on the lag screw 2, and the lateral tension screw 3 is in clearance fit with the third nail hole 13. When the screw is used, the main screw 1 can be firstly held by using a surgical tool, the treated femoral marrow cavity is implanted, then the oblique lag screw 2 is held by using the tool to penetrate through the first screw hole 11 on the main screw 1, and then the transverse lag screw 3 is held by using the tool to be screwed into the second screw hole 12 on the main screw 1 and penetrate through the third screw hole 13 on the oblique lag screw 2, so that the implantation is finished.
As shown in fig. 3 and 4, the main nail 1 has a proximal end 16 and a distal end 17, the proximal end 16 of the main nail 1 is provided with a fourth nail hole 14, the fourth nail hole 14 is communicated with the second nail hole 12, and the fourth nail hole 14 is internally provided with a tail cap 4. The main nail 1 comprises a proximal end 16 and a distal end 17, the proximal end section and the distal end section are integrally formed, the top end of the proximal end 16 is provided with a tail cap 4, the tail cap 4 is abutted against the transverse tension screw 3 and limits the transverse tension screw, the proximal end 16 adopts an expanding structure, the stability between rotors is improved, the tail end of the distal end 17 is a tip and is provided with a groove decompression surface, a certain distance is reserved from the locking nail, stress parts are dispersed, and occurrence of broken nails and occurrence of fracture again at the tail of the main nail 1 are reduced. The distal end 17 of the main nail 1 is also provided with a locking hole 15 for receiving an interlocking bone screw, further ensuring the stability of the intramedullary nail.
The difference with the prior art is that the locking sleeve 5 is further included, the locking sleeve 5 is arranged in the second nail hole 12, the locking sleeve 5 is provided with a first internal threaded hole 51 for accommodating the transverse tension screw 3, the first internal threaded hole 51 is formed along the length direction of the locking sleeve 5, and the rod part of the transverse tension screw 3 is provided with an external threaded section 31 matched with the first internal threaded hole 51.
The locking sleeve 5 further has a second internal threaded hole 52 for accommodating the tail cap 4, the second internal threaded hole 52 is perpendicular to the first internal threaded hole 51, and the tail cap 4 sequentially passes through the fourth nail hole 14 and the second internal threaded hole 52 to abut against the transverse tension screw 3 placed in the first internal threaded hole 51.
The lock sleeve 5 can be detachably arranged in the second nail hole 12, for convenient installation, the external thread section 31 of the transverse tension screw 3 and the first internal thread hole 51 of the lock sleeve 5 can be screwed and fixed in advance, so that the lock sleeve 5 is stably arranged on the transverse tension screw 3, then the transverse tension screw 3 is screwed into the second nail hole 12 until the lock sleeve 5 is matched and clamped with the second nail hole 12, the installation of the lock sleeve 5 is completed, and finally the tail cap 4 is screwed into the second internal thread hole 52 of the lock sleeve 5 from the fourth nail hole 14 to abut against the transverse tension screw 3, namely the main nail 1, the transverse tension screw 3 and the tail cap 4 are stably connected, the relative positions of the main nail 1, the transverse tension screw 3 and the tail cap 4 are fixed, the postoperative nail withdrawing phenomenon is effectively prevented, and the stability of the intramedullary nail is ensured.
To facilitate screwing in, the head of the lateral tension screw 3 is provided with a screw blade 32, the screw blade 32 being arranged at the periphery of the lateral tension screw 3. The helical blade 32 has a large surface area and increases the anchoring force by being screwed in.
As shown in fig. 2, in particular, the locking sleeve 5 includes a sleeve 53 and a guide plate 54, and the guide plate 54 is disposed at an end of the sleeve 53 remote from the third nail hole 13. The guide plate 54 has a first end face 541 abutting against the outer wall of the main nail 1 and a second end face 542 for the transverse tension screw 3 to extend into, the first end face 541 being planar, the second end face 542 being cambered. The outer wall of the main nail 1, which abuts against the first end face 541, is provided with a concave decompression plane 18, and the first end face 541 abuts against the decompression plane 18.
After the locking sleeve 5 is abutted into the second nail hole 12, the first end face 541 is abutted against the pressure reducing plane 18 of the outer wall of the main nail 1, so that the locking sleeve 5 is mounted, and the cambered second end face 542 is used for guiding the insertion of the transverse tension screw 3.
In order to prevent the locking sleeve 5 from rotating, the two sides of the locking sleeve 5 are provided with limiting planes 55, the inner wall of the second nail hole 12 is provided with a guiding plane 121 matched with the limiting planes 55, one end of the guiding plane 121, which is close to the third nail hole 13, is provided with limiting steps 122, and the limiting planes 55 symmetrically arranged on the two sides of the locking sleeve 5 are matched with the guiding planes 121 in the second nail hole 12, so that the rotation of the locking sleeve 5 can be prevented.
In order to facilitate the assembly and disassembly of the locking sleeve 5, an elastic limiting hook 56 matched with the limiting step 122 is further arranged on the limiting plane 55, and elastic grooves 57 are formed on two sides of the elastic limiting hook 56. When the locking sleeve 5 is propped into the second nail hole 12, the guide plane 121 extrudes the elastic limit hook 56 towards the center until the locking sleeve 5 stretches into place, the elastic limit hook 56 automatically rebounds and butts against the limit step 122 at the end part of the guide plane 121, and the locking sleeve 5 is stably clamped in the second nail hole 12 through the guide plate 54 and the elastic limit hook 56.
The above description is illustrative of the utility model and is not to be construed as limiting, and it will be understood by those skilled in the art that many modifications, changes or equivalents may be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. The utility model provides a prevent femur intramedullary nail of moving back nail, includes main nail (1), lag screw (2) and horizontal tension screw (3), be equipped with respectively on main nail (1) be used for holding first nail hole (11) of lag screw (2) and be used for holding second nail hole (12) of horizontal tension screw (3), still be equipped with on lag screw (2) and be used for holding third nail hole (13) of horizontal tension screw (3), horizontal tension screw (3) with third nail hole (13) clearance fit, its characterized in that: still include lock sleeve (5), lock sleeve (5) set up in second nail hole (12), lock sleeve (5) have one be used for holding first internal thread hole (51) of horizontal tension screw (3), first internal thread hole (51) are followed the length direction of lock sleeve (5) is seted up, the pole portion of horizontal tension screw (3) be equipped with first internal thread hole (51) matched with external screw thread section (31).
2. A nail-withdrawal-resistant intramedullary nail for femur as defined in claim 1, wherein: the main nail (1) is provided with a proximal end (16) and a distal end (17), the proximal end (16) of the main nail (1) is provided with a fourth nail hole (14), the fourth nail hole (14) is communicated with the second nail hole (12), and a tail cap (4) is arranged in the fourth nail hole (14).
3. A nail-withdrawal-resistant intramedullary nail for femur as defined in claim 2, wherein: the locking sleeve (5) is further provided with a second internal threaded hole (52) for accommodating the tail cap (4), the second internal threaded hole (52) is perpendicular to the first internal threaded hole (51), and the tail cap (4) sequentially penetrates through the fourth nail hole (14) and the second internal threaded hole (52) to be abutted against the transverse tension screw (3) arranged in the first internal threaded hole (51).
4. A nail-withdrawal-resistant intramedullary nail for femur as defined in claim 1, wherein: the locking sleeve (5) comprises a sleeve (53) and a guide plate (54), and the guide plate (54) is arranged at one end, far away from the third nail hole (13), of the sleeve (53).
5. An anti-backup intramedullary nail for femur as defined in claim 4, wherein: the guide plate (54) is provided with a first end face (541) abutting against the outer wall of the main nail (1) and a second end face (542) used for the transverse tension screw (3) to extend in, the first end face (541) is a plane, and the second end face (542) is an arc face.
6. An anti-backup intramedullary nail for femur as defined in claim 5, wherein: an inner concave pressure reducing plane (18) is arranged on the outer wall, which is abutted against the first end surface (541), of the main nail (1), and the first end surface (541) is abutted against the pressure reducing plane (18).
7. A nail-withdrawal-resistant intramedullary nail for femur as defined in claim 1, wherein: limiting planes (55) are arranged on two sides of the locking sleeve (5), guide planes (121) matched with the limiting planes (55) are arranged on the inner wall of the second nail hole (12), and limiting steps (122) are formed at one ends, close to the third nail holes (13), of the guide planes (121).
8. An anti-backup intramedullary nail for femur as defined in claim 7, wherein: the limiting plane (55) is also provided with an elastic limiting hook (56) matched with the limiting step (122), and elastic grooves (57) are formed on two sides of the elastic limiting hook (56).
9. A nail-withdrawal-resistant intramedullary nail for femur as defined in claim 2, wherein: the distal end (17) of the main pin (1) is also provided with a locking hole (15) for accommodating an interlocking bone screw.
10. A nail-withdrawal-resistant intramedullary nail for femur as defined in claim 1, wherein: the head of the transverse tension screw (3) is provided with a spiral blade (32), and the spiral blade (32) is arranged at the periphery of the transverse tension screw (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321585786.9U CN220001893U (en) | 2023-06-20 | 2023-06-20 | Femoral intramedullary nail capable of preventing nail backing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321585786.9U CN220001893U (en) | 2023-06-20 | 2023-06-20 | Femoral intramedullary nail capable of preventing nail backing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220001893U true CN220001893U (en) | 2023-11-14 |
Family
ID=88683331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321585786.9U Active CN220001893U (en) | 2023-06-20 | 2023-06-20 | Femoral intramedullary nail capable of preventing nail backing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220001893U (en) |
-
2023
- 2023-06-20 CN CN202321585786.9U patent/CN220001893U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101601605B (en) | Intramedullary nail fixation device for fractured near end of thighbone | |
| WO2019024741A1 (en) | Femur fixing apparatus | |
| CN202497228U (en) | Spiral blade type femur near-end minimally invasive lockplate | |
| CN220001893U (en) | Femoral intramedullary nail capable of preventing nail backing | |
| CN209966532U (en) | Pressure internal fixer capable of making two ends of fracture position between femur neck and tuberosity tightly combined | |
| CN201701286U (en) | Proximal femoral nail system | |
| CN102813544B (en) | External fixing rack for hip fracture | |
| CN201070384Y (en) | Combined fracture fixing device | |
| CN201734771U (en) | Intramedullary nail | |
| CN201445555U (en) | Thigh bone near-end fracture intramedullary nail fixing device | |
| CN207970139U (en) | A kind of interlocking formula pedicle screw sighting device | |
| CN201591617U (en) | Novel patella locking nail | |
| CN108498155B (en) | Self-locking anti-rotation pedicle screw and use method thereof | |
| CN211066974U (en) | Stable tension lock nail for femoral neck fracture angle | |
| CN209253081U (en) | PFNA proximal femoral nail instrument | |
| CN215937619U (en) | Internal fixation repair system for intertrochanteric fracture of femur | |
| CN113813036A (en) | Shape-fitting nail internal fixation system for intertrochanteric fracture | |
| CN208404803U (en) | A kind of interlocking anti-settling proximal femoral nail | |
| CN208910458U (en) | The installation tool of bone cement screw | |
| CN219661870U (en) | Anti-rotation femoral intramedullary nail | |
| CN215384529U (en) | Femoral intramedullary nail fixing system | |
| CN213129836U (en) | Universal hollow nail with bone cement | |
| CN102755187A (en) | Proximal femoral percutaneous locking dynamic hip helical blade nail | |
| CN216876560U (en) | Fixed triangular support intramedullary nail for femoral screw hole | |
| CN218832859U (en) | Knock-in self-tapping main nail suitable for low-incisura internal fixation system of femoral neck |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |