US 12,336,738 B2
Internal fixation system for anatomical reduction of fractured vertebral body of spine and intravertebral bone grafting
Dingjun Hao, Shaanxi (CN); and Haiping Zhang, Shaanxi (CN)
Assigned to Dingjun Hao, Shaanxi (CN)
Filed by Dingjun Hao, Shaanxi (CN)
Filed on Jun. 24, 2022, as Appl. No. 17/848,435.
Claims priority of application No. 202111205607.X (CN), filed on Oct. 15, 2021.
Prior Publication US 2023/0121328 A1, Apr. 20, 2023
Int. Cl. A61B 17/70 (2006.01); A61B 17/68 (2006.01); A61B 17/56 (2006.01)
CPC A61B 17/683 (2013.01) [A61B 17/7005 (2013.01); A61B 17/7014 (2013.01); A61B 2017/564 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An internal fixation system for anatomical reduction of a fractured vertebral body of a spine and intravertebral bone grafting, comprising at least two injured vertebra nails, wherein each of the at least two injured vertebra nails has a reduction connecting clip connected thereto, and all reduction connecting clips are connected by a connecting rod;
each of the at least two reduction connecting clips comprises a fixation screw, a reduction connecting nut, and a reduction connecting screw head; the reduction connecting nut has a connection through hole and a fixation screw hole, and an end of the reduction connecting rod is configured to extend into the connection through hole; the fixation screw is configured to be thread-connected to the fixation screw hole to fix the reduction connecting rod; and the reduction connecting screw head has a connecting hole, and an upper end of the injured vertebra nail is configured to extend into and be fixed in the connecting hole; and
the reduction connecting screw head and the reduction connecting nut are connected to each other and have a one-way gear structure at a joint thereof, and the reduction connecting screw head and the reduction connecting nut are rotatable in one direction relative to each other,
wherein the one-way gear structure comprises an inner gear ring arranged on the reduction connecting nut and an outer gear ring arranged on the reduction connecting screw head, and the inner gear ring and the outer gear ring match each other to form a gear mechanism with slanted gear teeth that are all parallel to one another, and
a triangular structure is formed by extension lines corresponding to two adjacent ones of the injured vertebra nails and the connecting rod between the two adjacent injured vertebra nails,
wherein the reduction connecting nut has an inner hole defined therein along an axial direction, the inner hole is in communication with the connection through hole and the fixation screw hole, the inner gear ring is arranged on one side of the inner hole, and the inner gear ring has a limiting ring provided on an outer edge thereof, the limiting ring extending away from the outer edge of the inner gear ring.