Internal fixing device for femoral neck fracture

Abstract

An internal fixing device for femoral neck fracture is characterized by comprising a sleeve, a hollow lag screw, an anti-rotation inserting nail and a tail cap, the hollow lag screw is connected into a center hole of the sleeve, and the hollow lag screw is connected with the anti-rotation inserting nail in a matched mode. The anti-rotation insertion nail and the hollow lag screw are in threaded connection with the tail cap, center threaded holes are formed in the center of the anti-rotation insertion nail and the center of the hollow lag screw, and the anti-rotation insertion nail and the hollow lag screw are in threaded connection with the tail cap. The risks of breakage and looseness of the fixing device are reduced; the fixing device designed by the utility model can effectively hold a fracture broken end, the anti-rotation insertion nails in four directions can be mutually engaged with the hollow lag screws, and the anti-rotation insertion nails are in an open state at the inner fixing far end, so that the effect of preventing a bone block from rotating is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of fixation equipment for fracture surgery, in particular to an internal fixation device for femoral neck fracture. Background Art

[0002] The current internal fixation method used to treat femoral neck fractures mainly uses hollow compression screws or femoral neck dynamic cross nails.

[0003] Among them, hollow compression screws are most commonly used in an inverted "品" shape with three screws placed in parallel. At this time, the long axis of the screw is relatively perpendicular to the fracture line. This fixation method is prone to stress concentration at the contact area, which may lead to problems such as broken screws or loosening.

[0004] The femoral neck dynamic cross nailing method is relatively complicated to operate. On the one hand, since the anti-rotation nail and the main nail are in the same plane, its overall anti-rotation ability is relatively poor; on the other hand, since the main nail is a smooth sliding rod, its ability to hold the fracture fragment is also poor.

[0005] Therefore, in order to solve the above problems, a femoral neck fracture internal fixation device is proposed. Utility Model Content

[0006] In response to the above technical problems, the utility model provides an internal fixation device for femoral neck fractures. Through the combination of a nail-plate system, the stress applied to the fixation device by the fracture end is effectively transferred to the locking steel plate, thereby reducing the risk of breakage and loosening of the fixation device. The anti-rotation insertion nails in four directions can engage with the hollow tension screws, and the anti-rotation insertion nails are in an open state at the distal end of the internal fixation, thereby preventing the bone fragment from rotating.

[0007] To achieve the above purpose, the technical solution of the utility model is as follows:

[0008] A femoral neck fracture internal fixation device, characterized in that it comprises a sleeve, a hollow lag screw, an anti-rotation insertion nail and a tail cap, wherein the hollow lag screw is connected in the center hole of the sleeve, the hollow lag screw is adaptively connected to the anti-rotation insertion nail, a central threaded hole is provided at the center position of the anti-rotation insertion nail and the hollow lag screw, and the anti-rotation insertion nail and the hollow lag screw are threadedly connected to the tail cap,

[0009] A plurality of grooves are arranged at intervals on the outer wall of the hollow tension screw.

[0010] The anti-rotation insertion nail is composed of a connecting block and a plug-in piece. A plurality of plug-in pieces are fixed on the connecting block, and the plug-in pieces are adapted to the grooves.

[0011] Specifically, the number of the grooves is 4, and the number of the plug-in pieces is 4.

[0012] Specifically, the end of the plug-in piece is configured as a pointed end structure, and the pointed end is relatively sharp so as to better penetrate into the bone.

[0013] Specifically, the diameter of the connecting block is the same as the inner diameter of the sleeve.

[0014] Specifically, a steel plate is provided at one end of the sleeve, and a locking hole is provided on the other end of the steel plate. A locking screw with a diameter of 3.5 mm is driven through the locking hole to lock the device on the outside of the femur.

[0015] Specifically, the sleeve, hollow tension screw, anti-rotation insertion nail and tail cap are all made of pure titanium, which has better human compatibility.

[0016] Beneficial effects of the utility model:

[0017] The utility model effectively transfers the stress applied to the fixation device by the fracture end to the locking steel plate through the combination of the nail plate system, thereby reducing the risk of the fixation device breaking and loosening.

[0018] The fixation device designed by the utility model can effectively hold the fracture ends, and the anti-rotation insertion nails in four directions can engage with the hollow tension screws, and the anti-rotation insertion nails are in an open state at the distal end of the internal fixation, thereby preventing the bone from rotating;

[0019] The utility model realizes a minimally invasive design, with less trauma and almost no soft tissue irritation. When locking is completed, the anti-rotation insertion nail, the hollow lag screw and the tail cap form a whole, which is not connected to the sleeve in the nail plate system, so it can slide in the sleeve. When the patient bears weight, the proximal fracture fragment will be pushed outward by the influence of the trunk gravity. Since there is no locking relationship between the whole body fixed with the fracture fragment and the sleeve, the fixed body can slide outward in the sleeve, thereby achieving a compression effect between the fracture fragments.

[0020] The utility model adopts only one thick screw when fixing the femoral neck fracture, which can better preserve the bone volume in the femoral neck and avoid the "Z" effect caused by the opposite displacement of two interlocking screws inserted into the femoral neck. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a femoral neck fracture internal fixation device according to the present invention;

[0022] Figure 2 This is a side view schematic diagram of the overall structure of a femoral neck fracture internal fixation device of the present invention;

[0023] Figure 3This is a schematic diagram of an exploded view of a femoral neck fracture internal fixation device according to the present invention;

[0024] Figure 4 This is a schematic diagram of an exploded front view of an internal fixation device for femoral neck fracture according to the present invention;

[0025] As shown in the figure: 1. Sleeve, 2. Hollow tension screw, 21. Groove, 22. Center threaded hole, 3. Anti-rotation insert nail, 31. Connecting block, 32. Connector, 4. Tail cap, 5. Steel plate, 6. Locking screw. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Example 1

[0030] As shown in the figure, a hollow tension screw 2 is connected to the center hole of the sleeve 1, and a plurality of grooves 2 are arranged at intervals on the outer wall of the hollow tension screw 2. The hollow tension screw 2 is adapted to be connected with the anti-rotation insertion nail 3. The anti-rotation insertion nail 3 is composed of a connecting block 31 and a plug-in piece 32. A plurality of plug-in pieces 32 are fixed on the connecting block 31, and the plug-in pieces 32 are adapted to the grooves 21. The diameter of the connecting block 31 is the same as the aperture of the center hole of the sleeve 1. The number of the grooves 21 is 4, and the number of the plug-in pieces 32 is 4. The end of the plug-in piece 32 is set to a tip structure, and its tip is relatively sharp to better penetrate the bone.

[0031] A central threaded hole 22 is provided at the center of the anti-rotation insertion nail 3 and the hollow lag screw 2, and the anti-rotation insertion nail 3 and the hollow lag screw 2 are threadedly locked with the tail cap 4 through the central threaded hole 22.

[0032] Specifically, the sleeve 1, the hollow tension screw 2, the anti-rotation insertion nail 3 and the tail cap 4 are all made of pure titanium, which has better human compatibility.

[0033] Example 2

[0034] When fixing the fracture, first insert a 2.5mm diameter 30mm long guide pin after satisfactory fracture reduction, use a 10mm diameter hollow drill bit to make a hole in the outer cortex of the femur along the direction of the guide pin, insert the sleeve 1 of the utility model, and gently tap it to make the steel plate 5 at the distal end of the sleeve 1 close to the femoral cortex.

[0035] Connect the hollow lag screw 2 to the center hole of the sleeve 1 along the direction of the guide needle. After the intraoperative X-ray frontal and lateral fluoroscopic position is satisfactory, push the anti-rotation insertion nail 3 in the direction of the groove 21 set on the nail body of the hollow lag screw 2. After the anti-rotation insertion nail 3 is pushed into the position, the tail end of its plug-in piece 32, that is, the part not located in the groove 21 on the hollow lag screw 2 is in an open state, which has an effective anti-rotation effect. When the tail cap 4 is screwed into the center threaded hole 22 of the hollow lag screw 2 and the anti-rotation insertion nail 3, the anti-rotation insertion nail 3 is locked on the hollow lag screw 2, so that the anti-rotation insertion nail 3, the hollow lag screw 2 and the tail cap 4 form a whole.

[0036] A locking screw 6 with a diameter of 3.5 mm is driven into the locking hole at the distal end of the steel plate 5 to lock the utility model to the outer side of the femur.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. The various components mentioned in the present invention are common technologies in the existing field. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in this utility model is defined by the appended claims and their equivalents.

Claims

1. A femoral neck fracture internal fixation device, characterized in that It consists of a sleeve, a hollow tension screw, an anti-rotation insertion nail and a tail cap. The hollow tension screw is connected to the center hole of the sleeve, and the hollow tension screw is adapted to be connected to the anti-rotation insertion nail. A central threaded hole is provided at the center position of the anti-rotation insertion nail and the hollow tension screw, and the anti-rotation insertion nail and the hollow tension screw are threadedly connected to the tail cap.

2. The femoral neck fracture internal fixation device according to claim 1, characterized in that A plurality of grooves are arranged at intervals on the outer wall of the hollow tension screw.

3. The femoral neck fracture internal fixation device according to claim 2, characterized in that The anti-rotation insertion nail is composed of a connecting block and a plug-in piece. A plurality of plug-in pieces are fixed on the connecting block, and the plug-in pieces are adapted to the grooves.

4. The femoral neck fracture internal fixation device according to claim 3, characterized in that The number of the grooves is 4, and the number of the plug-in pieces is 4.

5. The femoral neck fracture internal fixation device according to claim 1, characterized in that A steel plate is provided at one end of the sleeve, and a locking hole is provided at the other end of the steel plate.

6. The femoral neck fracture internal fixation device according to claim 1, characterized in that The sleeve, hollow tension screw, anti-rotation insertion nail and tail cap are all made of pure titanium.

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