Hollow Screw Fixation Positioning Guide for Femoral Neck Fracture

Abstract

The present invention relates to a hollow nail fixation positioning guide for femoral neck fractures, which comprises: a positioning rod, at the other end of which there are two screw holes arranged in the vertical direction; a sliding rod, which is slidably connected to the other end of the positioning rod and is provided with a through hole, and a screw passes through the through hole and is threadedly connected to one of the two screw holes of the positioning rod; an intertrochanteric fixation mechanism, which comprises a chute, a screw rod, a first positioning plate, a second positioning plate, a first guiding block and a second guiding block, the chute is fixed on the sliding rod, and the screw rod is rotatably arranged in the chute; the other end of the second positioning plate is arranged at one end of the chute, and the other end of the first positioning plate is arranged in the chute and is threadedly connected to the screw rod; the first guiding block and the second guiding block are respectively fixedly arranged on the side walls of the other ends of the first positioning plate and the second positioning plate facing each other, the first guiding block is provided with a guiding hole, and the second guiding block is provided with a guiding hole which is distributed in an inverted "pin" shape with the guiding hole on the first guiding block, and the guiding holes are arranged obliquely upward. With the above technical solution, the fixation method is precise, the operation time is shortened, and the complications are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to a hollow nail fixing and positioning guide for femoral neck fracture. Background Art

[0002] Femoral neck fractures are prone to nonunion and avascular necrosis of the femoral head. Currently, cannulated screw fixation is the preferred surgical approach for Garden I and II femoral neck fractures. However, due to the 12-15 degree anteversion of the femoral neck, cannulated screw fixation is difficult and challenging. Currently, both closed reduction and open reduction with cannulated screw fixation are performed based on experience and assisted by X-ray fluoroscopy. This is somewhat unreliable and often requires repeated fluoroscopic adjustments, which not only prolongs the operation but can also interfere with the remaining femoral neck blood flow.

[0003] Patent number CN201911139077.6 is a femoral neck fracture angle-stabilized intramedullary fixation device. Although it achieves precise fixation without the need for repeated fluoroscopic adjustments, it requires the patient to insert a nail into the apex of the greater trochanter to fix the device, making the operation more complicated, increasing the possibility of complications, and also prolonging the operation time. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a hollow nail fixation positioning guide for femoral neck fractures, which avoids repeated operations, has an accurate fixation method, shortens operation time, and reduces complications.

[0005] The hollow nail fixation and positioning guide for femoral neck fracture of the present invention adopts the following technical solution: it comprises:

[0006] The positioning rod is L-shaped and has two screw holes at the other end along the vertical direction;

[0007] A sliding rod, one end of which is slidably connected to the other end of the positioning rod and is provided with a through hole, through which a screw passes and is threadedly connected to one of the two screw holes of the positioning rod;

[0008] The intertrochanteric fixation mechanism includes a chute, a screw rod, a positioning plate, and a guide block. The chute is fixed to the other end of the slide bar, and the screw rod is rotatably arranged in the chute. The positioning plate is L-shaped and includes a first positioning plate and a second positioning plate. The other end of the second positioning plate is arranged at one end of the chute, and the other end of the first positioning plate is arranged in the chute parallel to the other end of the second positioning plate and is threadedly connected to the screw rod. One end of the first positioning plate and one end of the second positioning plate are parallel in the same direction as one end of the positioning rod. The guide block includes a first guide block and a second guide block. The first guide block and the second guide block are respectively fixed to the side walls of the other ends of the first positioning plate and the second positioning plate facing each other. A guide hole is provided at one end of the first guide block relative to the second guide block. The second guide block is provided with guide holes arranged in an inverted "pin" shape with the guide hole on the first guide block. The guide holes are inclined upward.

[0009] During use, one end of the positioning rod abuts against the cortex of the greater trochanter. Rotating the screw rod drives the first positioning plate to approach the second positioning plate. One end of the first positioning plate and one end of the second positioning plate clamp the intertrochanteric cortex, and the hollow screw is introduced into the femoral neck fracture site from the guide hole.

[0010] Furthermore, the other end of the second positioning plate is also arranged in the chute and is threadedly connected to the screw rod. The internal threads at the other ends of the first positioning plate and the second positioning plate are arranged in opposite directions.

[0011] Furthermore, the inclination angle range of the guide hole is 12 - 15°, and the preferred inclination angle is 13°.

[0012] Furthermore, the surface of one end of the positioning rod corresponding to the cortex of the greater trochanter is provided with abrasive tooth patterns, and the surfaces of one end of the first positioning plate and the second positioning plate corresponding to the intertrochanteric cortex are provided with abrasive tooth patterns.

[0013] Furthermore, handles are provided on both the screw and the screw rod.

[0014] Furthermore, M and F marks are respectively provided on one side of two screw holes at the other end of the positioning rod along the vertical direction downward.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] (1) Using this device can avoid repeated operations, the fixation method is precise, the operation time is shortened, and complications are reduced.

[0017] (2) By arranging one end of the first positioning plate and the second positioning plate in the chute and the internal threads are arranged in opposite directions, it is easier to adjust the position of the guide hole.

[0018] (3) By providing abrasive tooth patterns on the surface of one end of the positioning rod corresponding to the cortex of the greater trochanter and on the surfaces of the first positioning plate and the second positioning plate corresponding to the intertrochanteric cortex, the friction coefficients between the positioning rod and the cortex of the greater trochanter and between the first positioning plate, the second positioning plate and the intertrochanteric cortex are increased, avoiding slippage.

[0019] 4. The two screw holes at the other end of the positioning rod are marked with M and F respectively. The height between the positioning rod and the slide can be adjusted according to whether the selected case is male or female, so that the hollow nail can be introduced more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings described herein are used to provide a further understanding of the present application, in which:

[0021] Figure 1 This is a schematic structural diagram of embodiment 1 of the present invention;

[0022] Figure 2 This is a structural diagram of embodiment 2 of the present invention;

[0023] Figure 3 This is a schematic diagram of the application structure of Embodiment 1 or 2 of the present invention. DETAILED DESCRIPTION

[0024] See also Figure 1 As shown in the embodiment, the hollow nail fixation positioning guide for femoral neck fracture comprises:

[0025] The positioning rod 1 is L-shaped and has two screw holes 11 at its other end along the vertical direction;

[0026] The sliding rod 2 has one end slidably connected to the other end of the positioning rod 1 and is provided with a through hole, through which the screw 3 passes and is threadedly connected to one of the two screw holes 11 of the positioning rod 1;

[0027] The inter-rotor fixing mechanism 5 includes a slide 56, a screw 55, a positioning plate and a guide block. The slide 56 is fixed to the other end of the slide rod 2, and the screw 55 is rotatably arranged in the slide 56; the positioning plate is L-shaped, including a positioning plate 1 51 and a positioning plate 2 52. The other end of the positioning plate 2 52 is arranged at one end of the slide 56, and the other end of the positioning plate 1 51 is parallel to the other end of the positioning plate 2 52 and is arranged in the slide 56 and is threadedly connected to the screw 55. The positioning plate 1 51 and the positioning plate 2 One end of 52 is parallel to one end of the positioning rod 1 in the same direction; the guide block includes a guide block 1 53 and a guide block 2 54, and the guide block 1 53 and the guide block 2 54 are fixed on the other end side walls of the positioning plate 1 51 and the positioning plate 2 52 respectively. The guide block 1 53 is provided with a guide hole 57 at one end opposite to the guide block 2 54, and the guide block 2 54 is provided with a guide hole 57 distributed in an inverted "pin" shape with the guide hole 57 on the guide block 1 53, and the guide hole 57 is arranged upwardly inclined;

[0028] During use, one end of the positioning rod 1 rests on the cortex of the greater trochanter 103, and the rotating screw 55 drives the positioning plate 1 51 to move closer to the positioning plate 2 52. The positioning plate 1 51 and one end of the positioning plate 2 52 clamp the cortex between the trochanters 101, and the hollow nail is introduced into the femoral neck fracture 102 from the guide hole 57.

[0029] Furthermore, the guide hole 57 has an inclination angle ranging from 12° to 15°, preferably 13°.

[0030] Furthermore, one end of the positioning rod 1 is provided with a frosted tooth pattern 12 on the surface corresponding to the cortex of the greater trochanter 103, and one end of the positioning plate 1 51 and the positioning plate 2 52 is provided with a frosted tooth pattern 511 on the surface corresponding to the cortex of the intertrochanter.

[0031] Furthermore, the screw 3 and the screw rod 55 are both provided with a handle 4 .

[0032] Furthermore, M and F marks are respectively provided on one side of the two screw holes at the other end of the positioning rod facing downward in the vertical direction.

[0033] Except for the setting of the positioning plate, the other aspects of the embodiment 2 are consistent with the embodiment 1. The other end of the positioning plate 2 52 is also arranged in the slide groove 56 and is threadedly connected to the screw rod 55. The internal threads of the other ends of the positioning plate 1 51 and the positioning plate 2 52 are arranged oppositely.

[0034] Working principle of the present invention:

[0035] During use, the femoral neck fracture 102 of the iliac joint 10 needs to be fixed to the sliding rod 2 with the screw 3 according to whether the selected case is male or female, and the screw hole with M or F scale given to the positioning rod is tightened and fixed by the screw 3. One end of the positioning rod 1 is against the cortex of the greater trochanter 103, and the screw rod 55 is rotated to drive the positioning plate 1 51 to move closer to the positioning plate 2 52. The positioning plate 1 51 and one end of the positioning plate 2 52 clamp the cortex 101 between the trochanters, and then the hollow nail is introduced into the femoral neck fracture 102 through the guide hole 57. After it is firmly fixed, the positioning guide is taken out and three hollow screws are screwed in along the direction of the hollow nail.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hollow nail fixation and positioning guide for femoral neck fractures, characterized by: It includes: A positioning rod, which is L-shaped, and two screw holes are provided at the other end along the vertical direction; A sliding rod, one end of which is slidably connected to the other end of the positioning rod, and a through hole is provided. A screw passes through the through hole and is threadedly connected to one of the two screw holes of the positioning rod; An inter-rotor fixing mechanism, which includes a chute, a screw rod, a positioning plate and a guide block. The chute is fixed at the other end of the sliding rod, and the screw rod is rotatably arranged in the chute; the positioning plate is L-shaped, including a positioning plate one and a positioning plate two. The other end of the positioning plate two is arranged at one end of the chute, and the other end of the positioning plate one is arranged in the chute parallel to the other end of the positioning plate two and is threadedly connected to the screw rod. One end of the positioning plate one and the positioning plate two is parallel in the same direction as one end of the positioning rod; the guide block includes a guide block one and a guide block two. The guide block one and the guide block two are respectively fixedly arranged on the side walls of the other ends of the positioning plate one and the positioning plate two facing each other. A guide hole is provided at one end of the guide block one relative to the guide block two. The guide block two is provided with guide holes distributed in an inverted "pin" shape with the guide holes on the guide block one. The guide holes are inclined upward; During use, one end of the positioning rod abuts against the cortex of the greater trochanter. Rotate the screw rod to drive the positioning plate one to approach the positioning plate two. One end of the positioning plate one and the positioning plate two clamps the cortex between the rotors. The hollow nail is introduced into the femoral neck fracture site from the guide hole; the other end of the positioning plate two is also arranged in the chute and is threadedly connected to the screw rod. The internal threads at the other ends of the positioning plate one and the positioning plate two are arranged in opposite directions; The inclination angle range of the guide hole is 12 - 15°.

2. The hollow nail fixation and positioning guide for femoral neck fracture according to claim 1, characterized in that: The inclination angle of the guide hole is 13°.

3. The hollow nail fixation and positioning guide for femoral neck fracture according to claim 1, characterized in that: The surface of one end of the positioning rod corresponding to the cortex of the greater trochanter is provided with abrasive tooth patterns, and the surfaces of one ends of the positioning plate one and the positioning plate two corresponding to the cortex between the rotors are provided with abrasive tooth patterns.

4. The hollow nail fixation and positioning guide for femoral neck fracture according to claim 1, characterized in that: Handles are provided on both the screw and the screw rod.

5. The hollow nail fixation and positioning guide for femoral neck fracture according to claim 1, characterized in that: M and F marks are respectively provided on one side of the two screw holes at the other end of the positioning rod along the vertical direction downward.

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