US 12,290,296 B2
Bone fixation system capable of gradually changing from rigid fixation to axial non-rigid fixation
Xieping Dong, Nanchang (CN); Qingli Li, Nanchang (CN); Jingna Li, Yongzhou (CN); Zizheng Ai, NanChang (CN); Yuxiang Mei, JiuJiang (CN); Qunming Bian, NanChang (CN); and Weiyi He, GuangZhou (CN)
Assigned to Xieping Dong, Nanchang (CN)
Appl. No. 17/630,772
Filed by Xieping Dong, Nanchang (CN)
PCT Filed Jul. 2, 2020, PCT No. PCT/CN2020/100008
§ 371(c)(1), (2) Date Jan. 27, 2022,
PCT Pub. No. WO2022/000440, PCT Pub. Date Jan. 6, 2022.
Prior Publication US 2022/0265331 A1, Aug. 25, 2022
Int. Cl. A61B 17/80 (2006.01); A61B 17/86 (2006.01)
CPC A61B 17/86 (2013.01) [A61B 17/80 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A bone fixation system capable of gradually changing from rigid fixation to axial non-rigid fixation, the bone fixation system comprising:
a bone bridge that is attached with a connecting piece and realizes fixation through a plurality of bone nails, wherein the bone bridge spans fracture ends of a bone and is configured to be placed on bone surfaces on both sides of the fracture; a first bone nail at one of the fracture ends is configured to fix the bone to the bone bridge directly or through the connecting piece; a second bone nail at the other of the fracture ends is configured to fix the bone to the bone bridge through the connecting piece;
a degradable gasket made of a rigid degradable biological material is disposed between the connecting piece at another of the fracture ends and the bone bridge; the second bone nail, the connecting piece, the degradable gasket, the bone bridge, and the fracture ends are configured to be fixedly connected by the bone bridge to form a stable fracture/fixture complex at initial fixation, so as to form a stable static fixation;
as the degradable gasket is gradually degraded and absorbed in vivo, the connection between the connecting piece and the bone bridge where the degradable gasket is placed gradually loosens therewith; but the positional relationships between the second bone nail as well as the bone bridge and the fracture ends fixed by same are still stable rigid invariable structures; the joint between the connecting piece and the bone bride where the degradable gasket is placed becomes clearance fit; and the fracture ends constrained by the bone bridge, the connecting piece, and the bone nails can also only slide axially along the bone bridge under the action of an external force, that is, the fracture/fixture complex becomes axial non-rigid connection, and the fixation of the whole fixation system also gradually changes to axial non-rigid dynamic fixation.