CN214966486U - Hip bone fixation implant device - Google Patents
Hip bone fixation implant device Download PDFInfo
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- CN214966486U CN214966486U CN202022474131.7U CN202022474131U CN214966486U CN 214966486 U CN214966486 U CN 214966486U CN 202022474131 U CN202022474131 U CN 202022474131U CN 214966486 U CN214966486 U CN 214966486U
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Abstract
The utility model discloses a hip bone fixation implanting device, which comprises a main nail, a lag screw, an anti-rotation nail and a pressurizing locking nail; the near end of the main nail is provided with a first through hole and a second through hole which are communicated with each other; the lag screw penetrates through the first through hole, the front end of the lag screw is used for connecting the femoral head, the rear end of the lag screw is provided with internal threads, the side wall of the lag screw is provided with an axially extending notch, and the side wall of the notch is provided with a key groove; the anti-rotation nail penetrates through the second through hole to be in contact with the notch surface, the front end of the anti-rotation nail is provided with a side wing, and a boss is arranged on the contact surface of the anti-rotation nail; the rear end of the anti-rotation nail is provided with a step to limit the degree of freedom of forward movement of the anti-rotation nail; the pressurizing locking nail is in threaded connection with the lag screw and is forced to move the lag screw backwards under the limitation of the boss so as to apply pressure on the fracture line. The hip bone fixing and implanting device provided by the utility model can stably resist the torsional stress and the axial load, effectively prevent the rotation of the head of the femur, pressurize the fracture part and dynamically promote the healing of the hip fracture.
Description
Technical Field
The utility model relates to the technical field of medical equipment, especially, relate to a hip bone fixation implants device.
Background
The hip (groin area) is the area where the trunk connects with the legs, which makes the trunk and legs move forward, backward and sideways. Since the hip is the center of a series of physical movements, it is prone to potential strain and fracture. The intramedullary nail belongs to an orthopedic internal fixation instrument in medical instruments, is a preferred internal fixation instrument for hip fracture (such as femoral head and neck fracture), can control the axial force line of a fracture part, can prevent fracture rotation deformity by the interlocking intramedullary nail, and further reduces the risk of fracture of an implant. However, in most of the existing intramedullary nails, due to design defects, the fracture end is often rotated and separated and displaced during and after the operation, the broken end is unstable, the lag screw is cut out from the head of the femoral head, and the like, and the problems are often solved by re-operation, which causes pain to the patient and wastes medical resources.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to overcome the drawbacks of the prior art, and to provide a hip bone fixation implant device that can stably resist torsional stress and axial load, effectively prevent rotation of the head of the femur, and can apply pressure to the fracture site, dynamically promote the healing of the hip fracture.
In order to achieve the above object, the present invention provides the following technical solutions:
a hip bone fixation implant device comprising:
the main nail is provided with a first through hole and a second through hole which are mutually communicated at the near end, and a cortical bone screw at the far end;
the lag screw is of a hollow structure penetrating through the first through hole, the front end of the lag screw is provided with an external thread for connecting a femoral head, the rear end of the lag screw is provided with an internal thread, the side wall of the lag screw is provided with a notch which extends axially and is communicated with the inner cavity of the lag screw, and two side walls of the notch are respectively provided with a key groove;
the anti-rotation nail is arranged in the second through hole in a penetrating mode and is in surface contact with the notch of the notch, a side wing matched with the key groove is arranged at the front end of the anti-rotation nail, a boss extending into the tension screw is arranged on the contact surface of the anti-rotation nail, and the side wing and the boss can slide relative to the key groove and the notch along with the movement of the anti-rotation nail; the rear end of the anti-rotation nail is provided with a step which is used for being clamped outside the second through hole to limit the degree of freedom of forward movement of the anti-rotation nail;
and the pressurizing locking nail is connected with the lag screw through the internal thread and forces the lag screw to move backwards under the limitation of the boss so as to apply pressure on the fracture line.
As an implementation manner, the notch extends from the rear end of the lag screw to the external thread of the lag screw, and includes a front-section notch and a rear-section notch, and the side wings are disposed on two side walls of the front-section notch.
As a practical mode, the depth of the front section notch is smaller than that of the rear section notch, and the rear section notch is communicated with the inner cavity of the tension screw.
As a practical way, the pressurizing locking nail is in a frustum shape, and the diameter of the external thread of the pressurizing locking nail is gradually reduced from front to back.
As a practical matter, the diameter of the first through hole is larger than the diameter of the second through hole.
As an implementable mode, the step end part of the anti-rotation nail, the main nail, the lag screw and the pressure locking nail are all provided with grooves matched with an installation tool.
As an implementable manner, the shape of the groove is a straight line, a cross, an internal angle of a hexagon or a quincunx.
Compared with the prior art, the utility model discloses following beneficial effect has:
the hip bone fixation implanting device provided by the utility model mainly comprises a main nail, a lag screw, a rotation-proof nail and a pressurizing locking nail, when in use, the main nail is implanted into the medullary cavity of the femoral head, then the front end of the lag screw passes through a first through hole and is in threaded connection with the femoral head, meanwhile, the rotation-proof nail passes through a second through hole, the flank and the boss of the rotation-proof nail are ensured to be positioned in a notch, the rotation-proof nail is in surface contact with the notch of the notch, the flank can ensure that the front end of the rotation-proof nail is always attached to the lag screw, the opening problem is avoided, the assembly consisting of the lag screw, the rotation-proof nail and the pressurizing locking nail is ensured to smoothly pass through the main nail to move, then the pressurizing locking nail is screwed in from the rear end of the lag screw with a hollow structure, after the pressurizing locking nail has a certain distance, the front end of the pressurizing locking nail can be abutted against the boss of the rotation-proof nail and can not continue to move forwards, along with the continuous rotation of the pressurizing locking nail and the limitation of the step of the anti-rotation nail at the second through hole on the forward movement of the anti-rotation nail, the lag screw can drive the femoral head to move backwards, thereby realizing the pressurization of the bone line.
The anti-rotation nail is inserted so that the rotational freedom degree of the lag screw relative to the first through hole is lost, and the reduction loss caused by the fact that the thread on the lag screw drives the femoral head to rotate around the first through hole on the main nail is avoided; the matching of the notch, the boss and the step enables the pressurizing distance to be adjusted in a stepless mode; after the lag screw, the pressure nail and the anti-rotation nail are assembled, the tension screw and the pressure nail can move linearly along the first through hole or the second through hole in a single direction. Because of the limitation of the steps in the anti-rotation nail, the whole body can not move forwards and only can move backwards, so that the femoral head can be effectively prevented from being cut by the component moving forwards, the dynamic requirement is realized, and the rapid healing of the fracture is promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Figure 1 is a schematic structural view of a hip bone fixation implant device according to an embodiment of the present invention;
fig. 2 is a schematic view of a partial structure of a main nail according to an embodiment of the present invention;
figure 3 is a partial cross-sectional view of a hip bone fixation implant device provided in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lag screw according to an embodiment of the present invention;
fig. 5 is a schematic structural view of the anti-rotation nail provided in the embodiment of the present invention;
FIG. 6 is a cross-sectional view A-A of the tension screw of FIG. 3;
fig. 7 is a schematic structural view of a pressing lock pin according to an embodiment of the present invention.
Description of reference numerals:
1. a main nail; 11. a first through hole; 12. a second through hole; 2. a lag screw; 21. a notch; 211. a front section notch; 212. a rear section notch; 22. a keyway; 3. anti-rotation nails; 31. a boss; 32. a step; 33. a side wing; 4. pressing the locking nail; 5. cortical bone screws; 6. and (4) a groove.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the present invention provides a hip bone fixation implant device, which comprises a main nail 1, a lag screw 2 and an anti-rotation nail 3 parallelly inserted into the proximal end of the main nail 1, and a compression locking nail 4; in the present application, the proximal end refers to the end close to the user, the distal end refers to the end far from the user, the front end refers to the end close to the femoral head, and the rear end refers to the end far from the femoral head, wherein, referring to fig. 2, the proximal end of the main nail 1 is provided with a first through hole 11 and a second through hole 12 which are communicated with each other, the first through hole 11 is adapted to the lag screw 2, and the second screw 12 is adapted to the anti-rotation nail 3; the distal end is provided with cortical screws 5 to secure the distal end of the main nail 1 to the cortical bone 5. Referring to fig. 4, the lag screw 2 is a hollow structure passing through the first through hole 11, the front end of the lag screw is provided with an external thread for connecting with the femoral head, the rear end of the lag screw is provided with an internal thread for connecting with the compression locking nail 4, the side wall of the lag screw is provided with a notch 21 extending axially and communicating with the inner cavity of the lag screw 2, and two side walls of the notch 21 are respectively provided with a key slot 22; referring to fig. 1 or 3, the anti-rotation nail 3 is inserted into the second through hole 12 and contacts with the notch surface of the notch 21, referring to fig. 3-6, the front end of the anti-rotation nail 3 is provided with a side wing 33 limited in the notch 21, the contact surface of the anti-rotation nail 3 is provided with a boss 31 extending into the lag screw 2, both the side wing 33 and the boss 31 can slide relative to the key groove 22 and the notch 21 respectively along with the movement of the anti-rotation nail 3, and the rear end of the anti-rotation nail 3 is provided with a step 32 for being clamped outside the second through hole 12 to limit the degree of freedom of the forward movement of the anti-rotation nail 3; the pressurizing locking nail 4 is connected with the lag screw 2 through internal threads, when the front end of the pressurizing locking nail 4 abuts against the boss 31, the lag screw 2 is forced to move backwards by the continuous rotation of the pressurizing locking nail 4, and pressure is applied to the fracture line.
The design principle of the present application please refer to fig. 3, after the main nail 1 is implanted, the proximal locking is needed. The lag screw 2 is implanted through the first through hole 11, and at the moment, the head of the femur is connected with the lag screw 2 through the external thread of the head. The anti-rotation nail 3 is implanted through the second through hole 12 and is attached to the plane of the lag screw 2. Prevent inserting of changeing nail 3 and make lag screw 2 relative with the rotatory degree of freedom loss of first through-hole 11, avoid the external screw thread on lag screw 2 to drive the femoral head around the first through-hole 11 rotation on the main nail 1 to lead to restoring to the throne and lose. The anti-rotation nail 3 is inserted until the step 32 thereof contacts with the outer wall of the main nail 1. A compression locking nail 4 is screwed in and is in threaded engagement with the lag screw 2. When the end part of the pressurizing locking nail 4 contacts the boss 31 of the anti-rotation nail 3 and is screwed in continuously, the lag screw 2 is forced to linearly retreat along the axis, the head of the femur head also retreats along with the lag screw 2, so that the pressurization of the fracture line is realized, and the pressurizing distance can be adjusted in a stepless manner. After the lag screw 2, the pressurizing locking nail 4 and the anti-rotation nail 3 are assembled, the anti-rotation nail can move linearly along the first through hole 11 or the second through hole 12 of the main nail 1 in a one-way mode. Due to the limitation of the step 32 of the anti-rotation nail 3, the anti-rotation nail cannot move forwards and only can move backwards. Therefore, the lag screw 2 is effectively prevented from cutting the femoral head forwards, the dynamic requirement is realized, and the rapid healing of the fracture is promoted. And the cooperation of keyway 22 and flank 33 then can guarantee in this application to prevent the front end of revolving the nail constantly with lag screw laminating, avoids appearing opening the problem, and then guarantees going on smoothly of dynamic demand.
Please refer to fig. 5-6, in order to ensure the stability of the clamping of the lateral wing 33 in the notch 21, the notch 21 can be set into two parts, that is, the front section notch 211 and the rear section notch 212, so that the depth of the front section notch 211 is smaller than the depth of the rear section notch 211, it can be understood that only the rear section notch 212 is communicated with the inner cavity of the lag screw 2, and only two side walls of the front section key groove 211 are respectively provided with an axially extending key groove, therefore, the lateral wing 33 can not only enter the key groove 22 from the rear end of the front end notch 212 smoothly, but also the rear end of the front section notch 211 can cooperate with the step 32 to play a role of limiting and supporting the boss 31, thereby making the whole device more stable. When the anti-rotation nail 3 is inserted into the second through hole 12, the lateral wing 33 is placed into and moves forwards from the rear end of the front section notch 211 and the rear end of the rear section notch 212 of the boss 31, when the step 32 of the anti-rotation nail 3 contacts the side wall of the main nail 1, the boss 31 just abuts against the rear end wall of the front section notch 211, and the lateral wing 33 is correspondingly clamped in the key groove 22. The condition that the front section of the anti-rotation nail 3 is far away from the lag screw 2 can not occur in the process that the anti-rotation nail 3 integrally moves along the notch 21, and the phenomenon of opening mouth can not occur. Considering that the lag screw 2 needs to be internally provided with a compression locking screw and the whole body needs to bear a large force, the cross-sectional area of the lag screw 2 is designed to be larger than that of the anti-rotation nail 3, and the diameter of the first through hole 11 is also larger than that of the second through hole 12.
Referring to fig. 7, in order to make the compression locking nail 4 lock the assembly composed of the lag screw 2, the anti-rotation nail 3 and the compression locking nail 4, in this embodiment, the compression locking nail 4 is designed to be frustum-shaped, that is, the bottom diameter of the thread of the compression locking nail 4 is conical, and naturally, the diameter of the external thread arranged on the outer wall of the compression locking nail 4 is gradually changed.
Referring to fig. 3, 5 and 7, for the convenience of installation, the present application further provides a groove 6 adapted to an installation tool at the end of the step 32 of the anti-rotation nail 3. The groove 6 is in the shape of a straight line, a cross, an inner angle hexagon or a quincunx. Of course, the arrangement of the groove 6 is not limited to the step 32 of the anti-rotation nail 3, and may be arranged at the proximal end of the main nail 1 or the rear end of the tension screw 2 or the rear end of the compression locking nail 4.
The lag screw 2, the pressurization nail 4 and the anti-rotation nail 3 of this application are assembled the back, can follow the one-way rectilinear movement of first through-hole 11 and second through-hole 12 on the main nail 1. Because of the limitation of the step 32 in the anti-rotation nail 3, the whole body can not move forwards and only can move backwards, thereby effectively preventing the femoral head from being cut by the component moving forwards, realizing the dynamic requirement and promoting the rapid healing of the fracture.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A hip bone fixation implant device, comprising:
the main nail is provided with a first through hole and a second through hole which are mutually communicated at the near end, and a cortical bone screw at the far end;
the lag screw is of a hollow structure penetrating through the first through hole, the front end of the lag screw is provided with an external thread for connecting a femoral head, the rear end of the lag screw is provided with an internal thread, the side wall of the lag screw is provided with a notch which extends axially and is communicated with the inner cavity of the lag screw, and two side walls of the notch are respectively provided with a key groove;
the anti-rotation nail is arranged in the second through hole in a penetrating mode and is in surface contact with the notch, a side wing matched with the key groove is arranged at the front end of the anti-rotation nail, a boss extending into the tension screw is arranged on the contact surface of the anti-rotation nail, and the side wing and the boss can slide relative to the key groove and the notch along with the movement of the anti-rotation nail; the rear end of the anti-rotation nail is provided with a step which is used for being clamped outside the second through hole to limit the degree of freedom of forward movement of the anti-rotation nail;
and the pressurizing locking nail is connected with the lag screw through the internal thread and forces the lag screw to move backwards under the limitation of the boss so as to apply pressure on the fracture line.
2. The hip bone fixation implant device of claim 1, wherein said notch extends from the posterior end of said lag screw to the external thread of said lag screw, and includes an anterior notch and a posterior notch, said lateral wings being disposed on opposite sides of said anterior notch.
3. The hip bone fixation implant device of claim 2, wherein the depth of said anterior slot is less than the depth of said posterior slot, said posterior slot communicating with the internal cavity of said lag screw.
4. The hip bone fixation implant device according to claim 1, wherein said compression locking pin is frustoconical, the external thread diameter of said compression locking pin decreasing from anterior to posterior.
5. The hip bone fixation implant device according to claim 1, wherein said first through hole has a diameter greater than a diameter of said second through hole.
6. The hip bone fixation implant device according to claim 1, wherein the stepped end of the rotation prevention nail, the main nail, the lag screw and the compression lock nail are provided with recesses adapted to an installation tool.
7. The hip bone fixation implant device according to claim 6, wherein said recess has a shape of a straight line, a cross, an internal hexagonal or a quincunx.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022474131.7U CN214966486U (en) | 2020-10-30 | 2020-10-30 | Hip bone fixation implant device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022474131.7U CN214966486U (en) | 2020-10-30 | 2020-10-30 | Hip bone fixation implant device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214966486U true CN214966486U (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022474131.7U Active CN214966486U (en) | 2020-10-30 | 2020-10-30 | Hip bone fixation implant device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214966486U (en) |
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2020
- 2020-10-30 CN CN202022474131.7U patent/CN214966486U/en active Active
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