A push-up device for correcting the deviation of the pressure rod of the femoral intramedullary nail

Abstract

The utility model discloses a pushing device for correcting the deviation of a pressure rod of a femoral intramedullary nail in the field of medical device technology, comprising an intramedullary nail and an aiming arm, wherein the distal ends of the aiming arm and the intramedullary nail are respectively provided with an aiming hole and a locking nail hole, a pressure rod is suspended above the distal end of the main nail of the intramedullary nail, the pressure rod is supported by a pressure rod aiming platform on an inclined support arm, an inner deviation adjustment mechanism is detachably connected in the aiming hole, or / and an outer deviation adjustment mechanism is detachably connected in the strip hole on the inclined support arm. The utility model solves the problem that during the operation, the pressure rod of the existing femoral intramedullary nail distal locking device easily deviates to both sides of the pressure rod platform and cannot properly abut against the pressure rod platform, resulting in the failure of distal nail locking.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a pushing device for correcting the deviation of a pressure rod of a femoral intramedullary nail. Background Art

[0002] The use of femoral interlocking intramedullary nailing for internal fixation of femoral shaft fractures is recognized as the gold standard because of its firm fixation, simple operation and good effect. Femoral interlocking intramedullary nailing usually includes an intramedullary nail driven into the medullary cavity along the length of the femoral shaft, and then interlocking nails are driven into the proximal and distal ends of the intramedullary nail. Before driving the distal interlocking nail, a pressure rod needs to be passed through the distal aiming arm and rested on the pressure rod aiming platform at the distal end of the intramedullary nail to ensure the accuracy of locking the distal interlocking nail.

[0003] During the operation of the existing intramedullary nail, for example, the patent with patent application number 202022409432.1 discloses a femoral intramedullary nail distal locking device. During the process of aiming the pressure rod at the distal end of the intramedullary nail, due to many reasons such as anatomical variation of the femoral shaft, poor fracture reduction, misalignment of the instrument after long-term use, and poor nail entry point, the pressure rod is offset to the inside or outside. After the pressure rod is offset, if the pressure rod is not aligned with the pressure rod platform on the intramedullary nail after being pressed down, the intramedullary nail cannot be pressed down, which will directly lead to the failure of the distal locking nail. Therefore, those skilled in the art provide a push-up device for correcting the offset of the pressure rod of the femoral intramedullary nail to solve the problems raised in the above background technology. Utility Model Content

[0004] The utility model aims to provide a pushing device for correcting the deviation of the pressure rod of the femoral intramedullary nail, which solves the problem that during the operation, the pressure rod of the existing femoral intramedullary nail distal locking device is easily deviated to both sides of the pressure rod platform and cannot correctly abut the pressure rod platform, resulting in the failure of distal locking nail.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pushing device for correcting the deviation of a pressure rod of a femoral intramedullary nail, which includes an intramedullary nail and an aiming arm, wherein the distal ends of the aiming arm and the intramedullary nail are respectively provided with an aiming hole and a locking nail hole, a pressure rod is provided above the locking nail hole, the pressure rod is supported by a pressure rod aiming platform on an inclined support arm, an inner deviation adjustment mechanism is detachably connected in the aiming hole, and / or an outer deviation adjustment mechanism is detachably connected in the strip hole on the inclined support arm.

[0006] Preferably, the inward adjustment mechanism includes a first screw rod, one end of which is adjustably connected to a first arc-shaped cover that abuts against the patient's leg, a first screw rod nut is threadedly sleeved on the first screw rod, and the first screw rod nut is detachably connected to the aiming hole through a first connecting assembly.

[0007] Preferably, the first screw nut is detachably connected to the pressure rod aiming platform via an adjustable connecting frame, and open grooves are provided at both ends of the adjustable connecting frame. The open grooves at both ends are respectively pivotally connected to two support ears fixed on the pressure rod aiming platform and the first screw nut, and a pivot fastening mechanism is provided at the pivot connection.

[0008] Preferably, the first connecting assembly comprises a first connecting screw, which is inserted into the aiming hole and has two ends locked with the aiming arm through locking nut assemblies.

[0009] Preferably, the inner concave side of the first arc-shaped cover faces the patient's legs, and the middle part of the outer concave side is adjustably connected to the end of the first screw rod through a universal joint.

[0010] Preferably, the outward deviation adjustment mechanism includes a second screw rod, one end of which is adjustably connected to a second arc-shaped cover that abuts against the patient's leg, a second screw rod nut is threadedly sleeved on the second screw rod, and the second screw rod nut is fixed on the curved frame. The curved frame is detachably connected to any strip hole on the upper part of the inclined support arm through a second connecting assembly, and a plurality of strip holes are distributed along the length direction of the inclined support arm.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] By detachably connecting the inward deviation adjustment mechanism and / or outward deviation adjustment mechanism to the existing femoral intramedullary nail distal locking device, fine-tuning can be performed in time after the pressure rod deviates inwardly or / and outwardly, so that the bottom end of the pressure rod is accurately pressed on the pressure rod platform on the intramedullary nail, thereby improving the accuracy of the pressure rod operation during the operation, thereby improving the efficiency and effect of the operation.

[0013] The inner deviation adjustment mechanism and the outer deviation adjustment mechanism in the utility model do not need to improve the original surgical instrument, and the original structure on the instrument is used for connection to the greatest extent, which can save the use cost and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] In the figure: 1, intramedullary nail; 11, pressure rod platform; 2, pressure rod; 3, aiming arm; 31, aiming hole; 4, inclined support arm; 41, strip hole; 5, pressure rod aiming platform; 6, inner deviation adjustment mechanism; 61, first screw rod; 62, first arc cover; 621, universal joint; 63, first screw rod nut; 64, adjustable connecting frame; 641, open slot; 65, first connecting screw rod; 651, connecting rod; 66, support ear; 7, outer deviation adjustment mechanism; 71, second screw rod; 72, second arc cover; 73, second screw rod nut; 74, curved frame. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1 In an embodiment of the utility model, a push-up device for correcting the displacement of a pressure rod of a femoral intramedullary nail comprises an intramedullary nail 1 and an aiming arm 3, wherein the distal ends of the aiming arm 3 and the intramedullary nail 1 are respectively provided with an aiming hole 31 and a locking nail hole 11, and a pressure rod 2 is suspended above the locking nail hole 11, and the pressure rod 2 is supported by a pressure rod aiming platform 5 on an inclined support arm 4, and an inner deflection adjustment mechanism 6 is detachably connected in the aiming hole 31, or / and an outer deflection adjustment mechanism 7 is detachably connected in the strip hole 41 on the inclined support arm 4. When the pressure rod 2 deviates toward one side of the aiming arm 3, it is an outer deflection, and the pressure rod aiming platform 5 is pulled outwardly by the outer deflection adjustment mechanism 7, thereby driving the pressure rod 2 to move outwardly to above the pressure rod platform 11; conversely, when the pressure rod 2 deviates toward the side away from the aiming arm 3, it is an inner deflection, and the pressure rod aiming platform 5 is pulled by the inner deflection adjustment mechanism 6 to adjust the position of the pressure rod 2.

[0018] The inward adjustment mechanism 6 includes a first screw rod 61, one end of which is adjustably connected to a first arc-shaped cover 62 that abuts against the patient's leg, and the concave side of the first arc-shaped cover 62 faces the patient. A first screw rod nut 63 is threadedly sleeved on the first screw rod 61, and the first screw rod nut 63 is detachably connected to the aiming hole 31 through a first connecting assembly.

[0019] The first screw nut 63 is detachably connected to the pressure rod aiming platform 5 through an adjustable connecting frame 64, and both ends of the adjustable connecting frame 61 are provided with open grooves 641, and the open grooves 641 at both ends are pivotally connected to two support ears 66 fixed on the pressure rod aiming platform 5 and the first screw nut 63, respectively, and a pivot fastening mechanism is provided at the pivot connection. Specifically, the two support ears 66 and both ends of the adjustable connecting frame 61 have open through holes, and the two support ears 66 are respectively inserted into the open grooves 641 at the corresponding ends to align the through holes. After a bolt is passed through the through hole from one side, the adjustable connecting frame 61 is rotated to a suitable position, and then a nut is put on the bolt and locked to fix the position of the adjustable connecting frame 61.

[0020] The first connection assembly includes a first connection screw 65, the axis of the first connection screw 65 is parallel to the axis of the first screw nut 63, a limit ring is fixed on the outer wall of one side of the first connection screw 65 adjacent to the first screw nut 63, the outer diameter of the limit ring is larger than the inner diameter of the aiming hole 31, and the position of the first connection screw 65 passing through the aiming hole 31 is limited, and then the first connection screw 65 at the other end is locked with the aiming arm 3 through a locking nut assembly, and the locking nut assembly usually includes a nut and a gasket. The first connection screw 65 is fixedly connected to the first screw nut 63 through a connecting rod 651. The shape and position of the connecting rod need to avoid interference between the first screw 61 and the tilting arm 4, so the shape of the connecting rod 651 may be a curved rod or the connecting rod 651 may be fixed to one side of the outer wall of the first connection screw.

[0021] The inner concave side of the first arc cover 62 faces the patient's legs, and the middle of the outer concave side is adjustably connected to the end of the first screw rod 61 through the universal joint 621. The universal joint 621 allows the first arc cover 62 to adjust its angle at will, so that the first arc cover 62 can fit better with the patient's legs. The ball head seat of the universal joint 621 is fixed on the first arc cover 62, and the ball head of the universal joint 621 is fixed on the first screw rod 61, and the ball head is located in the ball head seat and the spherical surface is matched.

[0022] The aiming hole 31 is an existing structure on the distal locking device of the femoral intramedullary nail of the existing surgical instrument, and two are arranged on the aiming arm. During the operation, the inner deviation adjustment mechanism 6 is installed through an aiming hole close to the inner end. With the assistance of the inner deviation adjustment mechanism 6, the pressure rod 2 is smoothly pressed on the pressure rod platform 11, and the other aiming hole is used for aiming and hitting the distal interlocking nail. After locking, the inner deviation adjustment mechanism 6 is removed and the original instrument matching components are used to lock the other distal interlocking nail.

[0023] The outward deflection adjustment mechanism 7 includes a second screw rod 71, one end of which is adjustably connected to a second arc cover 72 that abuts against the patient's leg. The second arc cover 72 and the second screw rod 71 are connected in the same manner as the first arc cover 62 and the first screw rod 61. The second arc cover 72 and the second screw rod 71 can be connected through a universal joint so that the second arc cover 72 can fully contact the patient's leg. A second screw rod nut 73 is threadedly sleeved on the second screw rod 71, and the second screw rod nut 73 is fixed on a curved frame 74. The curved frame 74 is detachably connected to any strip hole 41 on the upper part of the inclined support arm 4 through a second connecting assembly, and a plurality of strip holes 41 are distributed along the length direction of the inclined support arm 4. The plurality of strip holes 41 are structures on the distal locking device of the femoral intramedullary nail of the original existing instrument. The second connecting assembly includes a bolt fixedly connected to the curved frame 74. The bolt passes through the strip hole 41 and is locked by a nut, thereby fixing the position of the second screw nut 73. The shape of the curved frame 74 is adapted according to the required position of the second screw nut 73 and the position of the strip hole 41 used for installation, so as to avoid interference with the position of the pressure rod 2. After the position of the second screw nut 73 is fixed, the second screw 71 is rotated to make the second arc cover 72 abut against the patient's leg, and the position of the pressure rod 2 can be pulled by continuing to rotate the second screw 71.

[0024] During the operation, it is necessary to use X-ray fluoroscopy to observe in which direction the pressure rod 2 is offset, so as to determine whether to install the outward adjustment mechanism 7 or the inward adjustment mechanism 6 for adjustment. In the process of rotating the first screw rod 61 or the second screw rod 71, since the corresponding screw nut is fixed, rotating the screw rod can increase the distance between the patient's thigh and the aiming arm 3. The increase in distance is equivalent to pulling the pressure rod 2 to the position above the pressure rod platform 11 in disguise, thereby adjusting the position of the pressure rod 2. As for the position to which the pull rod 2 is pulled, it is also determined under X-ray fluoroscopy.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pushing device for correcting the displacement of a pressure rod of a femoral intramedullary nail, comprising an intramedullary nail (1) and an aiming arm (3), wherein the distal ends of the aiming arm (3) and the intramedullary nail (1) are respectively provided with an aiming hole (31) and a locking nail hole (11), a pressure rod (2) is suspended above the locking nail hole (11), and the pressure rod (2) is supported by a pressure rod aiming platform (5) on an inclined support arm (4), characterized in that: The aiming hole (31) is detachably connected to an inner deflection adjustment mechanism (6), and / or the strip-shaped hole (41) on the inclined support arm (4) is detachably connected to an outer deflection adjustment mechanism (7).

2. The push-out device for correcting the displacement of the pressure rod of the femoral intramedullary nail according to claim 1, characterized in that: The inner deviation adjustment mechanism (6) comprises a first screw rod (61), one end of which is adjustably connected to a first arc-shaped cover (62) abutting against the patient's leg, a first screw rod nut (63) is threadedly sleeved on the first screw rod (61), and the first screw rod nut (63) is detachably connected to the aiming hole (31) via a first connecting assembly.

3. The push-out device for correcting the displacement of the pressure rod of the femoral intramedullary nail according to claim 2, characterized in that: The first screw nut (63) is detachably connected to the pressure rod aiming platform (5) via an adjustable connecting frame (64), and both ends of the adjustable connecting frame (64) are provided with open grooves (641), and the open grooves (641) at both ends are respectively pivotally connected to two ears (66) fixed on the pressure rod aiming platform (5) and the first screw nut (63), and a pivot fastening mechanism is provided at the pivot connection.

4. The push-out device for correcting the displacement of the pressure rod of the femoral intramedullary nail according to claim 2, characterized in that: The first connecting assembly comprises a first connecting screw (65), which is inserted into the aiming hole (31) and has two ends locked with the aiming arm (3) via locking nut assemblies.

5. The push-out device for correcting the displacement of the pressure rod of the femoral intramedullary nail according to claim 2, characterized in that: The inner concave side of the first arc-shaped cover (62) faces the patient's legs, and the middle part of the outer concave side is adjustably connected to the end of the first screw rod (61) via a universal joint (621).

6. The pushing device for correcting the displacement of the pressure rod of the femoral intramedullary nail according to claim 1, characterized in that: The outward deflection adjustment mechanism (7) comprises a second screw rod (71), one end of which is adjustably connected to a second arc-shaped cover (72) abutting against the patient's leg, a second screw rod nut (73) is threadedly sleeved on the second screw rod (71), and the second screw rod nut (73) is fixed on a curved frame (74), and the curved frame (74) is detachably connected to any of the strip holes (41) on the upper part of the inclined support arm (4) through a second connecting component, and a plurality of the strip holes (41) are distributed along the length direction of the inclined support arm (4).

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