| 摘要 |
A distraсtor for vertebrae comprises a rack bar with mobile and immobile branches, each of which is placed in cantilever fashion in one side of rack bar and connected with a rod-holder at an obtuse angle, and also mechanism for moving of mobile branch which is wheel and interacts with the bar. The bar projections are made rectangular, and the wheel has two grooves, diametrically located to each other in the distance, equal to the step between projections. The width of mobile branch meets such conditionwhere- mobile branch width,- friction constant of branch along bar and- distance between the rod-holder butt end part and the bar longitudinal axis. |
