ANTI-PENETRATION BONE IMPLANT DEVICE AND METHOD

A device for engagement with a bone includes a dynamically expandable tip (12), a dynamically expandable ring (40), or other dynamically expandable insert (60, 62, 401L) that reacts to forces pushingthe implant into bone tissue. The tip (12), ring (40) or insert (60, 62, 401L) expands at least normal to the direction of motion, increasing contact area between the surrounding bone tissue and the material and thereby reducing the occurrence of high areas of contact stress in the adjacent bone tissue. The tip (12), ring (40) or insert (60, 62, 401L) translates forces along an axis of motion intolateral frictional forces that can resist penetration into the bone tissue without the need for additional operator or patient interaction. A method of reducing migration of the device for engagementincludes the steps of providing the device and inserting the device within bone tissue. 种用于与骨骼啮合的装置，其包括可动态膨胀的端头(12)、可动态膨胀的环(40)或对推动植入物进入骨组织的力作出反应的其它可动态膨胀的插入物(60，62，401L)。所述端头(12)、环(40)或插入物(60，62，401L)至少与移动方向成法向膨胀，增加周围骨组织与材料之间的