CN-122005040-A - Internal fixing device is reinforceed to inside cross screw of femoral neck and steel sheet

CN122005040ACN 122005040 ACN122005040 ACN 122005040ACN-122005040-A

Abstract

The invention relates to a femoral neck internal cross screw and steel plate reinforced internal fixing device, belonging to the technical field of orthopedic medical appliances, aiming at solving the technical problems that a femoral neck fracture fixing device in the prior art has internal fixing failure risk and the like; the steel plate is attached to the outer side face of the fracture part, the main nail penetrates through the steel plate, the fracture end and penetrates deep into the fracture part, the transverse locking screw penetrates through the steel plate, the fracture end and the fracture part deep into the fracture part, the tail part of the main nail is connected with the steel plate, and the transverse locking screw also penetrates through the middle part of the main nail to form a triangular fixing structure with the main nail.

Inventors

SUN XIANQING
QIU PENG
WANG XIAOYAN
LI XIANG
ZHANG RUI
ZHU YUAN
HE ZHENNAN

Assignees

云南省曲靖中心医院(曲靖市第一人民医院)

Dates

Publication Date: 20260512
Application Date: 20260318

Claims (10)

1. The device is characterized by comprising a main nail, a transverse locking screw and a steel plate, wherein the steel plate is attached to the outer side surface of a femur between a greater trochanter and a lesser trochanter, the main nail penetrates through the steel plate and a fracture broken end and penetrates into the femur head, and the transverse locking screw penetrates through the steel plate and the fracture broken end and penetrates into the femur head; the tail parts of the main nails and the transverse locking screws are connected with the steel plate, and the transverse locking screws also penetrate through the middle parts of the main nails to form a triangular fixing structure with the main nails.
2. The internal femoral neck crossing screw and steel plate reinforced internal fixation device of claim 1, wherein the transverse locking screw is positioned above the main screw and is in cross connection with the main screw, wherein the coronal plane included angle between the transverse locking screw and the main screw is 35-50 degrees, and the sagittal plane included angle between the transverse locking screw and the main screw is 3-5 degrees.
3. The device for strengthening the internal fixation of the femur neck internal cross screw and the steel plate according to claim 1, wherein the main nail comprises an inner core, an outer sleeve and a tail nail, the outer sleeve is sleeved outside the inner core, and the tail nail is arranged at the tail part of the inner core; the tail nail is embedded at the tail part of the inner core and can rotate relative to the inner core, and the outer surface of the part of the tail nail extending out of the inner core is provided with threads; When the outer sleeve is sleeved on the inner core, the front end of the inner core with external threads is exposed, the tail of the outer sleeve is provided with internal threads, and the tail internal threads of the outer sleeve are connected with the external threads of the tail nails.
4. The device for reinforcing and fixing the internal cross screw and the steel plate of the femoral neck according to claim 3, wherein the outer surface of the inner core, which is close to the front end of the inner core, is provided with a limiting table, one end surface of the outer sleeve and the limiting surface of the limiting table are correspondingly arranged, and a gap is formed between one end surface of the outer sleeve and the limiting surface of the limiting table.
5. The femoral neck internal cross screw and steel plate reinforced internal fixation device according to claim 3, wherein the middle part of the inner core is provided with a transverse locking screw hole for the transverse locking screw to pass through, and the outer sleeve is also provided with a hole for the transverse locking screw to pass through; the inner wall of the tail part of the inner core is provided with a step, one end of the tail nail is provided with a clamping ring, and the clamping ring is clamped in the step.
6. The internal femoral neck crossing screw and steel plate reinforced internal fixation device of claim 3, wherein the external thread of the tail pin has a reverse thread of the external thread of the front end of the main pin; the front end thread part of the inner core gradually reduces in diameter from the tail part of the inner core to the front end direction of the inner core.
7. The internal femoral neck crossing screw and steel plate reinforced internal fixation device of claim 3, wherein the outer surface of the tail portion of the outer sleeve is threaded, and the outer sleeve is in threaded connection with the steel plate through the outer thread of the tail portion; the tail end of the tail nail is provided with a slot, and the cross section of the slot is quadrilateral, hexagonal or octagonal; The diameter of the main nail is 9mm-12mm, and the length of the main nail is 70mm-120mm.
8. The femoral neck internal cross screw and steel plate reinforced internal fixation device of claim 1, wherein the lateral locking screw is a solid screw, and the lateral locking screw is a full-threaded screw or a half-threaded screw; the tail of the transverse locking screw is provided with an external thread in threaded connection with the steel plate.
9. The internal femoral neck crossing screw and steel plate reinforced internal fixation device of claim 1, further comprising a lower locking screw, wherein in use, the lower locking screw is positioned below the lesser trochanter of the femur; The outer frame sighting device comprises a supporting rod, an arc ruler and a sighting block, wherein one end of the supporting rod is inserted into a groove of the tail nail, the other end of the supporting rod is fixedly connected with the arc ruler, a sliding groove is formed in the arc ruler, a clamping block is arranged on the lower surface of the sighting block and is embedded in the sliding groove in a sliding manner, a through hole is formed in the sighting block, and the axial direction of the through hole is coincident with the axial direction of the transverse locking screw.
10. The femoral neck internal cross screw and steel plate reinforced internal fixation device of claim 1, wherein the steel plate is further provided with a k-wire positioning hole; the steel plate is made of flexible materials; when the fracture type is a subtotal fracture and a transcervical fracture, the intersection point of the main nail and the transverse locking screw is positioned outside the fractured end of the bone; When the fracture type is a basal fracture, the intersection of the main pin and the lateral locking screw is located inboard of the fractured bone end.

Description

Internal fixing device is reinforceed to inside cross screw of femoral neck and steel sheet Technical Field The invention relates to the technical field of orthopedic medical instruments, in particular to a femur neck internal cross screw and steel plate reinforced internal fixing device. Background Femoral neck (femoral neck fractures, FNF) is a common clinical wound, accounting for 3.6% of the total fracture, and is common to the elderly, relatively, the incidence of femoral neck fracture in the middle-aged and young is much lower, accounting for about 2% -3% of the total femoral neck fracture. The operation treatment of the femoral neck fracture of the middle-aged and young patients is mainly carried out by fracture reduction internal fixation, so that the anatomy structure of the hip joint of the patients can be reserved, the function of the hip joint can be recovered, and the risk of needing secondary operation due to the limitation of the service life of the joint replacement prosthesis is avoided. At present, the treatment modes for the femoral neck fracture of the middle-aged and young are various, such as dynamic hip screws, cannulated screws, intramedullary nails, proximal femur locking steel plates, newly pushed femoral neck systems (femoral NECK SYSTEM, FNS) and the like. Because of the biomechanical properties and unique vascular structure of the head and neck bones of the femur, traditional treatment methods, although successful in clinical applications, still have a high incidence of complications such as internal fixation failure, neck shortening, neck varus deformity, etc., especially in Pauwels type II/III fractures. The related patent documents: The patent discloses a three-fork type internal fixation device for treating femoral neck fracture, which comprises a lateral fixing plate, a first femoral neck locking screw, a second femoral neck locking screw, a third femoral neck locking screw and a femoral shaft fixing screw, wherein the head end of the first femoral neck locking screw passes through a first thread locking hole and then is fixed into a femoral head through a femoral neck, the first femoral neck locking screw is provided with a first side hole and a second side hole, and the head end of the second femoral neck locking screw sequentially passes through a second thread locking hole and the first side hole and then is fixed into the femoral head through the femoral neck. The three femoral neck locking screws are respectively locked with the side fixing plates through self interconnection locking among the three femoral neck locking screws to form a mechanically stable three-dimensional space structure, so that stress is uniformly dispersed, and femoral head rotation, femoral neck collapse, varus deformity, screw displacement and femoral head cutting can be effectively prevented. The device comprises a main steel plate and an auxiliary steel plate, wherein a head nail is inserted into the surface of the main steel plate, a rotor is rotatably connected to the upper surface of the head nail, the auxiliary nail is inserted into the surface of the main steel plate, a locking component is arranged on the inner surface of the inserted nail, the locking component is used for fixing the relative position between the rotor and the inserted nail, a connecting component is rotatably connected to the surface of the auxiliary steel plate, the connecting component is used for fixing the relative position between the main steel plate and the auxiliary steel plate, the stability of the head nail can be improved through setting the inserted nail, the locking component and the connecting component, the rotor can facilitate positioning of jacks on the surface of the rotor through setting of the rotor, the head nail and the inserted nail can be matched more stably, and the connecting component can facilitate fixing the auxiliary steel plate on the side surface of the femur through setting of the connecting component. The non-patent literature searched: Journal name "Chinese journal of bone and joint injury", literature name "early curative effect comparison of femoral neck dynamic cross nail and hollow nail internal fixation treatment middle-young Pauwels type III femoral neck fracture", volume 40, 6 th, publication date 2025, 6 th month 15 days, this literature discloses that compared with 3 CCS inverted-Y internal fixation, the incidence of post-operation complication of the middle-young PauwelsIII femoral neck fracture in FNS internal fixation treatment is lower, the patient fracture healing time and the post-operation time to complete loading time are earlier, which is favorable for hip joint function recovery. The prior art represented by the above patent or document has at least the following technical problems or drawbacks that have not been solved: The method is widely applied to fracture treatment of traditional three hollow screws for femoral neck fracture, is suitable for femoral neck frac