CN106618719B - Hollow lag screw guide pin aiming fixer for reduction through posterior femoral lesser tuberosity - Google Patents

Abstract

The invention discloses a hollow lag screw guide pin aiming fixator capable of being reset through a small tuberosity of a posterior femur, which comprises an arc guide frame, wherein one end of the arc guide frame is provided with a reset frame, and the other end of the arc guide frame is provided with a combined sleeve moving along the arc guide frame; the tail end of the reset frame is connected with the arc guide frame, the front end of the reset frame is provided with a reset hook, and the reset frame is provided with a limit groove; the combined sleeve comprises an outer cylinder and an inner cylinder, the inner cylinder is coaxially movable in the outer cylinder, and the outlet ends of the inner cylinder and the outer cylinder are provided with sharp claws; the combined sleeve always points to the circle center of the arc guide frame in the moving process of the arc guide frame. This hollow lag screw guide pin that resets through little tuberosity of back femoral inserts from the rear when aiming the fixer operation, pushes away muscle with the arc form reset frame in the place ahead, resets the hook and hooks little tuberosity fracture piece and to the tractive of back below, can avoid the slip of this aiming the fixer in addition square spacing groove, and the effect that resets is directly reliable.

Description

Cannulated Lag Screw Guide Pin Aiming Fixator Transtrochanteric Reduction of Posterior Femur

technical field

The invention relates to the field of orthopedic surgery equipment, in particular to a guide pin aiming device, in particular to a hollow lag screw guide pin aiming fixer for reduction through the posterior lesser trochanter of the femur.

Background technique

Intertrochanteric fractures are common clinical orthopedic fractures. The lack of lateral fulcrums of fracture stress caused by the reduction and poor fixation of small trochanteric fracture fragments is the failure of internal fixation of intertrochanteric fractures (causing screw loosening, plate breakage, key cause of refracture, coxa varus, etc.). However, due to the special anatomical position of the lesser trochanter (located on the posterior medial side of the femur, which is the insertion point of the iliopsoas muscle), the fragment of the lesser trochanter is pulled forward and upward by the pull of the iliopsoas muscle after the fracture, and its position is deep in the , the lesser trochanter fracture fragments cannot be exposed and reduced directly during the operation; and the lesser trochanter is located on the posterior medial side of the proximal femur, so after the fracture fragments are reduced, the best direction of screw fixation should be from the anterolateral side of the proximal femur to the posterior inside.

Most of the current clinical operations use bone hooks to reset from the front, but the reduction effect is poor, and the lesser trochanter cannot be effectively fixed; in addition, the existing lesser trochanter reduction equipment is also inserted from the front of the proximal femur during surgery. It is expected to use its tip to hook and reduce the small trochanteric fragment, but the device also has poor reduction effect, and the guide pin and fixation screw cannot be placed in the ideal direction. In addition, the drilling of the guide wire can easily cause iatrogenic damage to the rear structures such as the sciatic nerve due to lack of barriers, so this operation causes great damage to the surrounding tissues.

At present, there is still a lack of special equipment that can be inserted from the posterior side of the proximal femur, reduced, and can simultaneously pressurize and fix the lesser trochanteric fragment.

Contents of the invention

The purpose of the present invention is to provide a simple structure, easy to use, safe and reliable, inserted from the rear during surgery, effectively avoid damage to the surrounding tissue, through the posterior lesser trochanter reduction hollow lag screw guide pin aiming fixer.

In order to achieve the above object, the technical solution of the present invention is to provide a hollow lag screw guide pin aiming fixer through the posterior lesser trochanter of the femur, which includes an arc guide frame, and one end of the arc guide frame is provided with a The other end of the reset frame and the arc guide frame is provided with a combined sleeve that moves along the arc guide frame; the end of the reset frame is connected with the arc guide frame, and the front end of the reset frame is provided with a reset hook. Limiting groove; the combined sleeve includes an outer cylinder and an inner cylinder, the inner cylinder moves coaxially in the outer cylinder, and the outlet ends of the inner cylinder and the outer cylinder are provided with sharp claws; the combined sleeve moves along the arc guide frame During the process, the sharp claws always point to the center of the arc guide frame.

Further, the inner cylinder is provided with an axial hole for placing a Kirschner wire.

Further, the front end of the reset frame is bent to form an arc-shaped peeling piece.

Further, the end of the reset frame is connected with the arc guide frame through a fixed block, and the fixed block is provided with a through groove for the reset frame to be inserted and fixed, and the reset frame can move along the through groove, so that it can move up, down, inside and outside. Adjust the outlet of the Kirschner wire tip in different directions to the position of the small trochanter.

Further, the combined sleeve is connected with the arc guide frame through the slider, the upper end of the slider is provided with a through groove for the arc guide frame to be inserted and fixed, and the arc guide frame can move along the through groove; the lower end of the slider There is a sleeve groove for the combined sleeve to be placed in and fixed, and the combined sleeve can move along the sleeve groove.

Further, a scale is provided on the arc guide frame.

Further, the upper end of the sleeve slider is provided with an adjustment and locking device, so that the sleeve slider is fixed on the arc guide frame.

Further, an adjusting and locking device is provided under the sleeve slider, so that the combined sleeve is fixed on the sleeve slider.

Further, the fixed block is provided with an adjusting and locking device, so that the reset frame is fixed on the fixed block.

Further, the limiting groove is located between the reset hook and the fixed block, and is close to the reset hook; the reset hook is located inside the front end of the reset frame.

The present invention has the following beneficial effects through the reduction of the posterior lesser trochanter of the femur and the aiming fixer of the hollow lag screw guide pin:

1. The hollow lag screw guide pin aiming fixer for transtrochanteric reduction of the posterior femur is simple in structure, easy to use, safe and reliable, accurate in reduction, and accurate pressure fixation on the basis of maintaining the reduction of fracture fragments.

2. The cannulated lag screw guide pin is inserted through the posterior lesser trochanter of the femur and aimed at the fixer during surgery, and the muscle is pushed away with the pointed arc-shaped stripper, and the reduction hook hooks the lesser trochanter fracture fragment and pulls it backward and downward. , Adding a square limit slot can prevent the aiming fixer from sliding, and the reset effect is direct and reliable.

3. It is convenient, quick and effective to use the closeness between the sharp claws of the outer sleeve and the reset hook to reset the fracture block;

4. After reset, the outer sleeve can be locked by adjusting the locking device to stabilize the small trochanteric fragment;

5. Due to the blocking of the front reset hook, the Kirschner wire will not be too long to cause secondary damage, and it is very easy to measure the length of the required screw;

6. During the process of moving the combined sleeve, the combined sleeve always points to the center of the arc guide frame (the fracture of the small trochanter), which is accurate and reliable;

7. After the outer cylinder is fixed to maintain the reduction of the fracture block, operations such as drilling into the Kirschner wire, drilling into the hollow drill, sounding and screwing in the screw through the inner cylinder are all carried out in the outer cylinder, effectively avoiding damage to the surrounding tissues.

Description of drawings

Fig. 1 is the structure schematic diagram of the present invention through posterior lesser trochanteric reduction cannulated lag screw guide pin aiming fixer;

In the figure: 1. Arc guide frame; 2. Adjust locking bolt; 3. Combined sleeve; 4. Sharp claw; 5. Reset hook; 6. Limit slot; 7. Reset frame; 8. Fixed block; 9 1. Adjusting locking bolt; 10. Sleeve groove; 11. Adjusting locking bolt; 12. Sleeve slider; 13. Arc-shaped stripping piece.

Detailed ways

In order to describe in detail the technical content and structural features of the cannulated lag screw guide pin aiming fixer for transtrochanteric posterior femoral reduction of the present invention, the following will be further described in conjunction with the embodiments and accompanying drawings.

As shown in Figure 1, the present invention resets the hollow lag screw guide pin aiming fixer through the posterior lesser trochanter of the femur, and comprises an arc guide frame 1, and one end of the arc guide frame 1 is provided with a reset frame 7, an arc guide The other end of the frame 1 is provided with a combined sleeve 3 that moves along the arc guide frame, and the specific structure is as follows:

The end of the reset frame 7 is connected with the arc guide frame 1 through the fixed block 8, and the front part of the reset frame 7 is bent to form an arc-shaped peeling part 13, and the inside of the front end is provided with a reset hook 5, and the arc-shaped peeling part 13 is located at the reset position. The front of the hook 5 and the direction is opposite (the reset hook 5 is located inside the reset frame, and the arc-shaped stripping part 13 is located outside the reset frame); between and close to reset hook 5. The fixed block 8 is provided with a through slot for the reset frame 7 to be fixed, and the reset frame can move along the through slot. After moving, the reset frame 7 is fixed on the fixed block by adjusting the locking device, and the adjustment lock The device is to adjust the locking bolt 9.

The combined sleeve 3 includes an outer cylinder and an inner cylinder, the inner cylinder moves coaxially in the outer cylinder, and the outlet ends of the inner cylinder and the outer cylinder are provided with sharp claws 4; the combined sleeve 3 moves along the arc guide frame During the process, the claws always point to the center of the arc guide frame. An axial hole for placing a Kirschner wire is arranged in the inner cylinder. The inner cylinder has at least two layers (middle cylinder and small cylinder). The axial hole of the innermost small cylinder matches the outer diameter of the Kirschner wire to fix the Kirschner wire. The inner diameter of the middle cylinder matches the outer diameter of the hollow drill. It acts as a guide for the hollow drill to ensure that the direction of the hollow drill does not deviate at all times, achieving the purpose of high-precision drilling.

The combined sleeve 3 is connected with the arc guide frame 1 through the sleeve slider 12, the upper end of the slider 12 is provided with a through groove for the arc guide frame to be inserted and fixed, and the arc guide frame can move along the through groove. After moving, the sleeve slide block is fixed on the arc guide frame by adjusting the locking device, and the adjusting locking device is the adjusting locking bolt 2. The lower end of the slider 12 is provided with a sleeve groove 10 for the combined sleeve to be inserted and fixed. The combined sleeve can move along the sleeve groove 10. After moving, the combined sleeve can be fixed on the sleeve by adjusting the locking device. On the slide block, the adjusting locking device is the adjusting locking bolt 11.

The arc guide frame 1 is provided with a scale.

The use process of the present invention through the posterior lesser trochanteric reduction hollow lag screw guide pin aiming fixer is as follows:

1. Insert from the rear during the operation, push away the muscle with the pointed arc-shaped peeling piece, hook the small trochanter fracture fragment with the reduction hook, and pull the fracture fragment backward and downward;

2. Use the closeness between the claws of the outer sleeve and the reset hook to reset the fracture block;

3. After reset, the outer sleeve can be locked by adjusting the locking bolt;

5. After the outer cylinder is fixed to maintain the reduction of the fracture fragment, the inner cylinder is inserted into the outer cylinder, and a Kirschner wire is drilled through the central axial hole of the inner cylinder, and the Kirschner wire penetrates the lesser trochanter after passing through the inner cylinder and the femur; Due to the blocking of the front reset hook and the limit groove, the Kirschner wire will not be too long to cause secondary damage.

6. To keep the outer cylinder fixed and to maintain the reduction of the fracture block, first take out the innermost small cylinder, drill the hollow drill along the inner diameter of the middle cylinder along the direction of the Kirschner wire, and then take out the middle cylinder after inserting the hollow drill.

7. Operations such as measuring the required screw length and screwing in the screws are all carried out in the outer cylinder.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (8)

1. The hollow lag screw guide pin that resets through little tuberosity of rear side femoral aims the fixer, its characterized in that: the device comprises an arc guide frame, wherein one end of the arc guide frame is provided with a reset frame, and the other end of the arc guide frame is provided with a combined sleeve moving along the arc guide frame; the tail end of the reset frame is connected with the arc guide frame, the front end of the reset frame is provided with a reset hook, and the reset frame is provided with a limit groove; the combined sleeve comprises an outer cylinder and an inner cylinder, the inner cylinder is coaxially movable in the outer cylinder, and the outlet ends of the inner cylinder and the outer cylinder are provided with sharp claws; the combined sleeve moves along the arc guide frame, and the sharp claw always points to the circle center of the arc guide frame; an axial hole for placing a Kirschner wire is formed in the inner cylinder, and the front end part of the reset frame is bent to form an arc-shaped stripping piece.

2. The hollow lag screw guide pin aiming fixture for reduction through the posterior femoral lesser tuberosity as claimed in claim 1, wherein: the tail end of the reset frame is connected with the arc guide frame through the fixing block, the fixing block is provided with a through groove for the reset frame to be fixedly placed, and the reset frame can move along the through groove.

3. The hollow lag screw guide pin aiming fixture for reduction through the posterior femoral lesser tuberosity as claimed in claim 1, wherein: the combined sleeve is connected with the arc guide frame through a sleeve sliding block, a through groove for the arc guide frame to be placed and fixed is formed in the upper end of the sleeve sliding block, and the arc guide frame can move along the through groove; the lower end of the sleeve sliding block is provided with a sleeve groove for the combined sleeve to be placed into and fixed, and the combined sleeve can move along the sleeve groove.

4. The hollow lag screw guide pin aiming fixture for reduction through the posterior femoral lesser tuberosity as claimed in claim 1, wherein: and scales are arranged on the arc guide frame.

5. The hollow lag screw guide pin aiming fixture for reduction through the posterior femoral lesser tuberosity as claimed in claim 3, wherein: and an adjusting and locking device is arranged at the upper end of the sleeve sliding block, so that the sleeve sliding block is fixed on the arc guide frame.

6. The hollow lag screw guide pin aiming fixture for reduction through the posterior femoral lesser tuberosity as claimed in claim 3, wherein: and an adjusting and locking device is arranged below the sleeve sliding block, so that the combined sleeve is fixed on the sleeve sliding block.

7. The hollow lag screw guide pin aiming fixture for reduction through the posterior femoral lesser tuberosity as claimed in claim 2, wherein: and the fixed block is provided with an adjusting and locking device, so that the reset frame is fixed on the fixed block.

8. The hollow lag screw guide pin aiming fixture for reduction through the posterior femoral lesser tuberosity as claimed in claim 1, wherein: the limiting groove is positioned between the reset hook and the fixing block and is close to the reset hook; the reset hook is positioned on the inner side of the front end of the reset frame.

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