CN-120814893-B - Proximal femur anti-rotation intramedullary nail

CN120814893BCN 120814893 BCN120814893 BCN 120814893BCN-120814893-B

Abstract

The invention relates to the technical field of intramedullary nails, in particular to a proximal femur anti-rotation intramedullary nail, which comprises a round rod, wherein an auxiliary rotating component is arranged in the round rod, a fixing component for fixing the rotating angles of two ends is arranged at the upper end of the round rod, a shielding component is arranged at the upper end of the fixing component, the rotating component comprises a round cavity arranged in the round rod, rotating grooves are formed in two ends of the round rod, the round rod is connected in the rotating grooves in a rotating way, annular grooves are formed in the outer wall of the round rod, a fixed plug block fixed on the surface is driven by a lantern ring to be inserted into an inserting hole, the fixed plug block is inserted into the rotating grooves to be attached to the round rod, the round rod is fixed in the rotating grooves through the fixed plug block, and therefore, the rotating angles of a distal rotating block and a proximal rotating block can be fixed, the distal rotating block and the proximal rotating block can be prevented from rotating in the femur, the intramedullary nail and tissues in the femur can be effectively prevented from rubbing against the tissues in the bone, and a series of influences caused by the friction of the tissues in the bone can be avoided.

Inventors

LV HOUCHEN
YANG CHANG
JU WEN
QIN KAIHUA
Liang Dingfa
CUI XIANG
ZHANG LICHENG

Assignees

中国人民解放军总医院第四医学中心

Dates

Publication Date: 20260508
Application Date: 20250903

Claims (5)

1. The proximal femur anti-rotation intramedullary nail comprises a round rod (1), wherein an auxiliary rotating assembly (2) is arranged in the round rod (1), a fixing assembly (3) for fixing the rotating angles of two ends is arranged at the upper end of the round rod (1), and a shielding assembly (4) is arranged at the upper end of the fixing assembly (3); The rotary assembly is characterized in that the rotary assembly (2) comprises a round cavity (21) formed in the round rod (1), rotary grooves (22) are formed in two ends of the round rod (1), two rotary rods (23) are rotatably connected in the rotary grooves (22), annular grooves (24) are formed in the outer walls of the two rotary rods (23), a fixed ring (25) is fixedly sleeved in the rotary grooves (22), a far-end rotary block (26) and a near-end rotary block (27) are fixedly connected to the two rotary rods (23) respectively, threaded holes (28) are formed in the surfaces of the far-end rotary block (26) and the near-end rotary block (27), and screws (29) are connected to the internal threads of the threaded holes (28); The fixing assembly (3) comprises two lantern rings (31) movably sleeved on the inner wall of the circular cavity (21), a screw hole (32) is formed in the center of the lantern rings (31), a rotating strip (33) is inserted in the lantern rings (31), fixing threads (34) are formed in the surface of the rotating strip (33), two fixing chocks (35) are symmetrically and fixedly connected on the surface of the lantern rings (31), and insertion holes (36) are formed in the inner walls of the two ends of the circular cavity (21); The shielding assembly (4) comprises a fixed ring (41), the fixed ring (41) is fixedly connected to the upper end of a proximal rotating block (27), a clamping groove (42) is formed in the upper end of the fixed ring (41), a rotating piece (43) is clamped in the clamping groove (42), a clamping hole (44) is formed in the rotating piece (43), a clamping strip (45) is inserted into the clamping hole (44), a threaded cap (46) is connected to the outer wall of the fixed ring (41) in a threaded mode, and a slot (47) is formed in the threaded cap (46).
2. The proximal femur anti-rotation intramedullary nail according to claim 1, wherein the retaining ring (25) is clamped inside the annular groove (24), and the retaining ring (25) is matched with the annular groove (24).
3. The proximal femur anti-rotation intramedullary nail according to claim 1, wherein the fixed plug (35) is inserted into a receptacle (36), and the receptacle (36) is in communication with the rotation groove (22).
4. A proximal femur anti-rotation intramedullary nail according to claim 1, wherein the upper end of the rotation bar (33) extends to the outside through the proximal rotation block (27), and the fixing threads (34) on the surface of the rotation bar (33) are divided into two sets of opposite directions.
5. The proximal femur anti-rotation intramedullary nail according to claim 1, wherein the clamping strip (45) is fixedly connected to the upper end of the rotating strip (33), and the upper end of the clamping strip (45) is inserted into the slot (47).

Description

Proximal femur anti-rotation intramedullary nail Technical Field The invention relates to the technical field of intramedullary nails, in particular to a proximal femur rotation-preventing intramedullary nail. Background The anti-rotation intramedullary nail is a medical instrument for internal fixation of fracture, and mainly utilizes the unique design of implanting a special intramedullary nail into a intramedullary cavity to realize the stable fixation of a fracture part, can effectively control the rotation and shortening of the fracture part, provides a stable mechanical environment for fracture healing, promotes the growth and healing of poroma at the fracture end, and reduces the occurrence risks of complications such as fracture nonunion, deformity healing and the like. For example, a fine-tuning rotatable intramedullary nail with the publication number CN211355816U can be used under local anesthesia, by rotating the nut, the rotating rod rotates to drive the rotating head to rotate, so that the lower nail rod rotates, free rotation of the intramedullary nail is realized, and thus, the postoperative rotation deformity is corrected, but because one end of the intramedullary nail is set to be rotatable, when the intramedullary nail is extruded in a bone, the intramedullary nail automatically rotates, so that friction is generated between the intramedullary nail and tissues in the bone, and the friction may damage blood vessels of the endosteal, affect blood supply at the fracture end, delay poroma formation and increase fracture non-union risk. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a proximal femur anti-rotation intramedullary nail. The invention solves the technical problems by adopting the technical scheme that the proximal femur rotation-preventing intramedullary nail comprises a round rod, wherein a rotating assembly for assisting in rotation is arranged in the round rod, a fixing assembly for fixing the rotating angles of two ends is arranged at the upper end of the round rod, and a shielding assembly is arranged at the upper end of the fixing assembly; the rotating assembly comprises a round cavity formed in the round rod, rotary grooves are formed in two ends of the round rod, rotary rods are rotatably connected in the rotary grooves, annular grooves are formed in the outer walls of the rotary rods, fixing rings are fixedly sleeved in the rotary grooves, the other ends of the two rotary rods are fixedly connected with a far-end rotary block and a near-end rotary block respectively, threaded holes are formed in the surfaces of the far-end rotary block and the near-end rotary block, and screws are connected to the internal threads of the threaded holes; The fixed subassembly is including the activity cup joints two lantern rings on the round cavity inner wall, threaded hole has been seted up to the center department of lantern ring, peg graft in the inside of lantern ring has the commentaries on classics strip, set up fixed screw thread on the surface of commentaries on classics strip, symmetrical fixedly connected with two fixed chocks on the surface of lantern ring, the jack has all been seted up on the both ends inner wall in round cavity. Specifically, the fixed ring is clamped in the annular groove, and the fixed ring is matched with the annular groove. Specifically, the fixed chock is pegged graft inside the jack, the jack is linked together with changeing the groove. Specifically, the upper end of the rotating bar penetrates through the proximal rotating block to extend to the outside, and two fixed threads on the surface of the rotating bar are reversely arranged. Specifically, shielding assembly includes solid fixed ring, gu fixed ring fixed connection is in the upper end of near-end commentaries on classics piece, the clamping groove has been seted up to gu fixed ring's upper end, the inside joint in clamping groove has the commentaries on classics piece, the clamp hole has been seted up to the inside of commentaries on classics piece, peg graft in the inside in clamp hole has the holding strip, threaded connection has the screw cap on gu fixed ring's the outer wall, the slot has been seted up to the inside of screw cap. Specifically, the holding strip is fixedly connected to the upper end of the rotating strip, and the upper end of the holding strip is inserted into the slot. The invention has the beneficial effects that: (1) According to the proximal femur anti-rotation intramedullary nail, the fixed chock fixed on the surface is driven by the lantern ring to be inserted into the insertion hole, so that the fixed chock is inserted into the rotary groove to be attached to the rotary rod, the rotary rod is fixed in the rotary groove through the fixed chock, and the rotation angles of the distal rotary block and the proximal rotary block can be fixed, so that the distal rotary block and the proximal rotary block can be prevented from rota