与之相比，锁定钢板外固定架的生物力学原则相仿，无需钢板与骨之间的摩擦力。
In contrast, locking plates follow the biomechanical principle of external fixators and do not require friction between the plate and bone.
固定保护绳包括锚点、摩擦力和位置。
在另一实施例中， 一压电元件与一阻力件相接，该阻力件与该杆件以静摩擦力相接触而固定；
One other embodiment has one piezoelectric element, one resistance part connected to the piezoelectric element and one rod normally fixed by means of static friction force.
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