Sheaths for implantable fixation devices and methods of using the sheaths are disclosed. Sheaths have a flexible body with a perforated wall, and an interior of the body is sized and shaped to receive the fixation device. Sheaths include a plurality of flexible or inflexible tubes arranged to form a ring, where the central cavity defined by the ring is sized and shaped to receive the fixation device.

 
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< ANTI-MIGRATION FEATURES AND GEOMETRY FOR A SHAPE MEMORY POLYMER STENT

> Porous Material for Use as Implant, Bone Replacement and in General as Material

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