Patent ID: 11864797
Assignee: TEXAS SCOTTISH RITE HOSPITAL FOR CHILDREN
Field: Medical technology (Instruments)
Classification: CPC A  F | IPC A

Claim 19:
20. An external fixation system, comprising:
a coil spring having a helical structure with a central cavity, wherein the coil spring comprises a plurality of spirals;
wherein the coil spring comprises a non-circular cross-sectional shape including a first surface extending along a length of the coil spring and facing a first direction and an opposing second surface extending along the length of the coil spring and facing a second direction opposite the first direction, the coil spring being configured such that the first surface contacts the second surface when the coil spring is in a resting state;
wherein the first surface and the second surface are shaped to permit adjacent spirals of the plurality of spirals to nest and configured to deter sheering movement between adjacent spirals of the plurality of spirals while permitting angular bending of the coil spring.