Internal fixation support device for distal femoral fracture

Abstract

The utility model relates to medical instrument technical field especially is involved in a kind of femur distal segment fracture internal fixation support device, including fixed plate, the fixed plate has first fixed part and with the second fixed part of first fixed part connection, first fixed part and the second fixed part on all be provided with multiple nail holes;Outer locking sleeve, the outer locking sleeve with first fixed part vertical connection, and the other end of outer locking sleeve inserts and is connected with inner sleeve, and the inner sleeve is connected with second fixed part by connecting rod.The utility model is beneficial to the femur distal segment fracture site is fixed stable, reduce surgical trauma simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an internal fixation device for distal femoral fractures. Background Technology

[0002] With social progress and an aging population, the number of patients with distal femoral fractures is gradually increasing. Currently, in addition to external fixation, surgical internal fixation for distal femoral fractures includes central intramedullary nailing and eccentric external fixation with plates. Intramedullary nailing for distal femoral fractures is further divided into antegrade intramedullary nailing (implanting from the proximal femur to the distal femur) and retrograde intramedullary nailing (implanting from within the knee joint to the proximal femur). Antegrade fixation systems are prone to insufficient fixation strength and treatment failure due to the increased diameter of the distal femoral medullary canal and osteoporosis. Retrograde intramedullary nailing systems require opening the knee joint cavity, causing some damage to the articular cartilage, and also carry the risk of insufficient fixation strength due to osteoporosis. Both intramedullary nailing systems require advanced surgical equipment and skilled surgeons, making them unsuitable for use in primary care hospitals. Furthermore, intramedullary nailing systems are not suitable for distal femoral fractures involving the articular surface.

[0003] Internal fixation with plates offers significant advantages over intramedullary nailing. Firstly, it reduces surgical complexity. Secondly, the plate-screw locking system provides strong fixation for osteoporotic conditions. Thirdly, it can address distal femoral fractures and severely comminuted fractures that cannot be fixed by intramedullary nails. The disadvantage of internal fixation with plates is eccentric fixation, which increases the risk of plate breakage. Clinically, to avoid plate breakage, two plates are used simultaneously on both the medial and lateral sides for fixation. While double-plate fixation increases fixation strength, it also increases surgical trauma, risks, and complications.

[0004] Current distal femoral plate fixation systems are all eccentric internal fixation systems. In addition to insufficient fixation stability, they are also not conducive to fracture healing. The internal fixation plate is prone to breakage before the fracture heals, which leads to a second surgery and brings unnecessary trauma and economic burden to the patient.

[0005] Therefore, those skilled in the art are dedicated to developing an internal fixation device for distal femoral fractures that can stabilize the fracture site while reducing surgical trauma. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an internal fixation device for distal femoral fractures, which is conducive to fixing the distal femoral fracture site firmly and reducing surgical trauma.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0008] An internal fixation device for distal femoral fractures, comprising:

[0009] A fixing plate having a first fixing part and a second fixing part connected to the first fixing part, wherein both the first fixing part and the second fixing part are provided with a plurality of nail holes;

[0010] An outer locking sleeve is perpendicularly connected to the first fixing part, and an inner sleeve is inserted into the other end of the outer locking sleeve. The inner sleeve is connected to the second fixing part through a connecting rod.

[0011] The beneficial effects of adopting the above scheme are: the first and second fixation parts of the fixation plate are respectively provided with multiple nail holes, so that the fixation bracket device is closely connected with multiple parts of the distal femur, increasing the contact points and dispersing stress, thereby improving the fixation strength, effectively preventing the displacement and rotation of the fracture ends, and providing a stable environment for fracture healing.

[0012] The fixation plate, inner sleeve, and connecting rod form a stable triangular support, which integrates the advantages of strong holding force of steel plate fixation and the advantages of central fixation stability of intramedullary nail. It can be adapted to all patients with distal femoral fractures, and only requires one steel plate to achieve minimally invasive internal fixation, reducing surgical trauma and avoiding more surgical risks and complications.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, the first fixation part is provided with a first arc surface adapted to the distal end of the femur, and the second fixation part is provided with a second arc surface adapted to the femoral shaft.

[0015] The beneficial effects of adopting the above-mentioned further solution are: the first fixation part and the second fixation part are respectively provided with arc surfaces that are adapted to the distal end and the shaft of the femur, which can closely fit the natural curvature of the femur, ensure close contact between the fixation bracket and the femoral surface, improve the fixation effect, reduce displacement or loosening caused by poor fit between the device and the bone, and enhance the overall stability and reliability.

[0016] The curved surface helps to distribute the stress more evenly after fixation, avoiding stress concentration that causes excessive pressure and damage to the local bone, which is beneficial to protecting the integrity of the bone and promoting fracture healing. In particular, for patients with osteoporosis, it can reduce the risk of further deterioration of the fracture due to stress concentration.

[0017] Furthermore, the second fixing part is provided with a mounting hole, one end of the connecting rod is threadedly connected to the mounting hole, and the other end of the connecting rod is connected to the first threaded hole on the inner sleeve.

[0018] The advantages of adopting the above-mentioned further solution are: by connecting the connecting rod to the mounting hole of the second fixing part and to the first threaded hole on the inner sleeve through the threaded connection, a precise and stable connection can be achieved, ensuring the firmness between the components and preventing loosening or displacement during the fixation process. At the same time, the threaded connection facilitates fine-tuning during surgery, and medical personnel can flexibly adjust the tightness of the connection according to the actual situation to achieve the best fixation effect.

[0019] Furthermore, the first fixing part is provided with a second threaded hole that is threadedly connected to the outer locking sleeve, and the first fixing part is provided with an outer sleeve locking hole that axially penetrates the first fixing part;

[0020] The outer sleeve locking hole includes a first semi-circular hole communicating with the second threaded hole and a second semi-circular hole disposed on the outer locking sleeve. The first semi-circular hole and the second semi-circular hole are joined together to form the outer sleeve locking hole, and a locking Kirschner wire is inserted into the outer sleeve locking hole.

[0021] The beneficial effects of adopting the above-mentioned further solution are: the second threaded hole provided on the first fixing part is threadedly connected to the outer locking sleeve, and the locking hole of the outer sleeve can realize the tight locking of the outer locking sleeve and the first fixing part, preventing the outer locking sleeve from rotating or loosening during the fixing process, further improving the stability and reliability of the entire device, and ensuring the fixation effect of the fracture site.

[0022] Furthermore, the inner sleeve is provided with a central hole that penetrates the inner sleeve axially, and the central hole communicates with the first threaded hole.

[0023] The beneficial effects of adopting the above-mentioned further solution are: the central hole guides the inner sleeve to be driven into the appropriate position, and at the same time, after the inner connecting rod is screwed in, the guide wire can be used to determine whether it is in the first threaded hole.

[0024] Furthermore, the tip of the connecting rod is provided with a tapered notch in the circumferential direction.

[0025] The beneficial effects of adopting the above-mentioned further solution are: the tapered notch facilitates error correction when the connecting rod is screwed in, and also plays a certain navigation role.

[0026] Furthermore, a protrusion is provided on the side of the mounting hole and near the first fixing part.

[0027] The beneficial effect of adopting the above-mentioned further solution is that by thickening the second fixing part near the first fixing part of the mounting hole through the protrusion, the stability of the inclined connecting rod can be improved, and the inner sleeve can be screwed in deeper.

[0028] Furthermore, the first fixing part and the second fixing part are hinged together, and there is a rotational clearance at the hinge point between the first fixing part and the second fixing part.

[0029] The beneficial effects of adopting the above-mentioned further solution are: the first fixation part and the second fixation part are connected by a hinge, and a rotation gap is set at the hinge, so that the fixation bracket has a certain degree of mobility, which can adapt to the slight movement and deformation of the distal femoral fracture site during physiological activities, and helps to fix the fracture without hindering the normal physiological function of the local area.

[0030] Furthermore, the connecting rod extends beyond the mounting hole, and a locking pin is provided at the end of the connecting rod.

[0031] The beneficial effect of adopting the above-mentioned further solution is that the connecting rod extending out of the mounting hole can be used to connect with other bones or parts, thereby improving the stability and durability of the entire device. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0033] Figure 2 This is a partial schematic diagram of the external locking sleeve mounting structure of this utility model;

[0034] Figure 3 This is a partial sectional view of the inner sleeve of this utility model;

[0035] Figure 4 This is a schematic diagram of the connecting rod structure of this utility model;

[0036] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1. First fixing part; 2. Second fixing part; 3. Outer locking sleeve; 4. Inner sleeve; 5. First threaded hole; 6. Mounting hole; 7. Connecting rod; 8. Outer sleeve locking hole; 9. Locking Kirschner pin; 10. Rotation clearance; 11. Locking pin; 12. Pin hole; 101. Second threaded hole; 102. First arc surface; 201. Protrusion; 202. Second arc surface; 401. Center hole; 701. Conical notch; 801. First semi-circular hole; 802. Second semi-circular hole. Detailed Implementation

[0039] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0040] In the description of this utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "circumferential", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Example 1

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an internal fixation device for distal femoral fractures includes...

[0045] The fixation plate has a first fixation part 1 and a second fixation part 2 connected to the first fixation part 1. Both the first fixation part 1 and the second fixation part 2 can be made of titanium alloy steel plate or stainless steel plate. Both the first fixation part 1 and the second fixation part 2 are provided with multiple nail holes 12. The nail holes 12 can be used to connect the first fixation part 1 and the second fixation part 2 to the patient's femur. Multiple nail holes 12 can provide more fixation points, enhance the connection stability between the fixation plate and the femur, and ensure that the fixation plate will not shift during the fracture healing process.

[0046] An outer locking sleeve 3 is perpendicularly connected to the first fixing part 1, and an inner sleeve 4 is inserted into the other end of the outer locking sleeve 3. The inner sleeve 4 is connected to the second fixing part 2 through a connecting rod 7.

[0047] In this invention, a stable triangular support and fixation is formed by the first fixing part 1, the second fixing part 2, the inner sleeve 4, and the connecting rod 7. It integrates the advantages of strong holding force of steel plate fixation, and also has the advantages of stable central fixation of intramedullary nail. It can also be adapted to all patients with distal femoral fractures.

[0048] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the first fixing part 1 is provided with a first arc surface 102 adapted to the distal end of the femur, and the second fixing part 2 is provided with a second arc surface 202 adapted to the femoral shaft. The second fixing part 2 is provided with a mounting hole 6, one end of the connecting rod 7 is threaded to the mounting hole 6, and the other end of the connecting rod 7 is connected to a first threaded hole 5 on the inner sleeve 4. The axis of the first threaded hole 5 is obliquely inserted through the long axis side of the inner sleeve 4.

[0049] In this embodiment, two first threaded holes 5 are arranged side by side on the inner sleeve 4 along the axis of the inner sleeve 4, and two mounting holes 6 are arranged side by side on the second fixing part 2. Two connecting rods 7 pass through the mounting holes 6 and the corresponding first threaded holes 5 respectively to improve stability.

[0050] A protrusion 201 is provided on the side of the mounting hole 6 and near the first fixing part 1. A tapered notch 701 is provided circumferentially at the tip of the connecting rod 7. The protrusion 201 thickens the second fixing part 2 on the side of the mounting hole 6 near the first fixing part 1, which can improve the stability of the inclined connecting rod 7 and allow the inner sleeve 4 to be screwed in deeper.

[0051] In order to increase the contact surface with the bone and the pressure of the connecting rod 7, the inner sleeve 4 is elliptical, and the inner sleeve 4 is provided with a central hole 401 that penetrates the inner sleeve 4 axially, and the central hole 401 communicates with the first threaded hole 5.

[0052] In this design, the first fixation part 1 is adapted to the shape of the distal femur, which facilitates better placement of the fixation plate in the appropriate position during surgery and is also conducive to fracture reduction and fixation. The first fixation part 1 is attached to the distal femur, and the second fixation part 2 is attached to the femoral shaft. Then, the connecting rod 7 passes through the mounting hole 6 and extends to the first threaded hole 5 for internal thread fixation, forming a triangular stable support fixation that is suitable for all patients with distal femoral fractures. At the same time, only one steel plate is needed, and minimally invasive internal fixation can be achieved, reducing surgical trauma and avoiding more surgical risks and complications.

[0053] like Figure 2As shown, the first fixing part 1 is provided with a second threaded hole 101 that is threadedly connected to the outer locking sleeve 3. The first fixing part 1 is provided with an outer sleeve locking hole 8 that axially penetrates the first fixing part 1. The outer sleeve locking hole 8 includes a first semi-circular hole 801 that communicates with the second threaded hole 101 and a second semi-circular hole 802 provided on the outer locking sleeve 3. The first semi-circular hole 801 and the second semi-circular hole 802 are spliced ​​together to form the outer sleeve locking hole 8. A locking Kirschner wire 9 is inserted into the outer sleeve locking hole 8. The outer locking sleeve 3 is locked by passing through the outer sleeve locking hole 8 with the locking Kirschner wire 9 so that the inner sleeve 4 can be driven into the preset position.

[0054] Example 2

[0055] like Figure 5 As shown, the difference between Embodiment 2 and Embodiment 1 lies only in that the first fixing part 1 and the second fixing part 2 are hinged together, and the hinge joint has a rotation gap 10. This hinged connection allows for a certain degree of relative rotation between the first fixing part 1 and the second fixing part 2, enabling more flexible adaptation to the anatomical shape of the femur during installation and further improving the device's adaptability. The connecting rod 7 extends beyond the mounting hole 6, and a locking pin 11 is provided at the end of the connecting rod 7. The connecting rod 7 extending beyond the mounting hole 6 can be used to connect with other bones or parts, improving the stability and durability of the entire device. Simultaneously, after connecting to other bones through the mounting hole 6 and further locking with the locking pin 11, the first fixing part 1 and the second fixing part 2 can not only withstand compression but also tension. Furthermore, the first fixing part 1 and the second fixing part 2 can rotate slightly, achieving dynamic support.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An internal fixation device for distal femoral fractures, characterized in that: include The fixing plate has a first fixing part (1) and a second fixing part (2) connected to the first fixing part (1), and both the first fixing part (1) and the second fixing part (2) are provided with a plurality of nail holes (12). An outer locking sleeve (3) is perpendicularly connected to the first fixing part (1), and an inner sleeve (4) is inserted into the other end of the outer locking sleeve (3). The inner sleeve (4) is connected to the second fixing part (2) through a connecting rod (7).

2. The internal fixation device for distal femoral fractures according to claim 1, characterized in that: The first fixing part (1) is provided with a first arc surface (102) adapted to the distal end of the femur, and the second fixing part (2) is provided with a second arc surface (202) adapted to the femoral shaft.

3. The internal fixation device for distal femoral fractures according to claim 1, characterized in that: The second fixing part (2) is provided with a mounting hole (6), one end of the connecting rod (7) is threaded to the mounting hole (6), and the other end of the connecting rod (7) is connected to the first threaded hole (5) on the inner sleeve (4).

4. The internal fixation device for distal femoral fractures according to claim 1, characterized in that: The first fixing part (1) is provided with a second threaded hole (101) that is threadedly connected to the outer locking sleeve (3), and the first fixing part (1) is provided with an outer sleeve locking hole (8) that axially penetrates the first fixing part (1). The outer sleeve locking hole (8) includes a first semi-circular hole (801) communicating with the second threaded hole (101) and a second semi-circular hole (802) provided on the outer locking sleeve (3). The first semi-circular hole (801) and the second semi-circular hole (802) are joined together to form the outer sleeve locking hole (8). A locking Kirschner wire (9) is inserted into the outer sleeve locking hole (8).

5. The internal fixation device for distal femoral fractures according to claim 1, characterized in that: The inner sleeve (4) is provided with a central hole (401) that axially penetrates the inner sleeve (4), and the central hole (401) communicates with the first threaded hole (5).

6. The internal fixation device for distal femoral fractures according to claim 1, characterized in that: The tip of the connecting rod (7) is provided with a tapered notch (701) in the circumferential direction.

7. The internal fixation device for distal femoral fractures according to claim 3, characterized in that: A protrusion (201) is provided on the side of the mounting hole (6) and near the first fixing part (1).

8. The internal fixation device for distal femoral fractures according to claim 1, characterized in that: The first fixing part (1) and the second fixing part (2) are hinged together, and there is a rotation gap (10) at the hinge of the first fixing part (1) and the second fixing part (2).

9. The internal fixation device for distal femoral fractures according to claim 3, characterized in that: The connecting rod (7) extends out of the mounting hole (6), and a locking pin (11) is provided at the end of the connecting rod (7).

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