Implantable fixture

摘要

A self-tapping fixture is implantable in a bone. The fixture extends generally longitudinally from an apical end to a distal end along a longitudinal axis L and has a periphery, the periphery comprises a first zone A extending away from the apical end to merge with a second zone B, the second zone B extending away from the first zone A to merge with a third zone C, the third zone C extending away from the second zone B to merge with a fourth zone D and the fourth zone D extending away from the third zone to terminate at the distal end of the fixture, and the third zone C is provided with a plurality of thread wraps each merging from the periphery and extending generally radially away therefrom to terminate at a generally rounded wrap ends.

主权项

1. An implantable fixture for implantation within a bone site, comprising:
a fixture extending generally longitudinally from an apical end to a distal end and defined around a central longitudinal axis L; a bore defined within said distal end of said fixture around an axis that is coincident with said central longitudinal axis L of said fixture; said fixture having an outer peripheral surface wherein said outer peripheral surface comprises a first zone A extending axially away from said apical end and toward said distal end so as to merge with a second zone B, said first zone A comprising a plurality of helical threads wherein crest portions thereof have substantially sharp triangular cross-sectional configurations so as to permit said helical threads of said first zone A to cut into and enter the bone site; said second zone B extending axially away from said first zone A and toward said distal end so as to merge with a third zone C, said second zone B comprising a plurality of helical threads wherein crest portions thereof have substantially blunt trapezoidal cross-sectional configurations so as to permit said helical threads of said second zone B to penetrate and enlarge the bone site; and said third zone C extending axially away from said second zone B and toward said distal end; said third zone C comprising a plurality of helical threads wherein crest portions thereof have substantially semi-circular cross-sectional configurations so as to permit said helical threads of said third zone C to advance and anchor said fixture within the bone site; and a plurality of tubs equiangularly spaced in a circumferential manner upon said outer peripheral surface of said fixture, each of said plurality of tubs having a longitudinal axis T which is tilted at a predetermined angle relative to said central longitudinal axis of said fixture, and each one of said plurality of tubs is wholly confined longitudinally within said third zone C so as to effectively relieve pressures generated at the bone site as a result of said fixture being implanted into the bone at the bone site.