| 摘要 |
A tubular anchor representing a thin-walled tubular body (1), comprising a front guiding part (2) which is cone-shaped, of irregular wedge shape or star-shaped, and is provided with at least two grooves (4) which are disposed symmetrically with respect to its longitudinal axis and which are of equal or different depth. The angle formed between the generatrix of the conical part (2) and the axis of the tubular body (1) can be from 0 to 45<o>. Behind the front guiding part (2) there is shaped a working part (5) with a length greater than that of the front guiding part (2), with a smooth or uneven external surface, and with an oval or elliptic cross-section, the perimeter of which is smaller, equal or greater than the perimeter of the anchor hole, the diameter of the anchor hole being always smaller than the great axis of the oval. At the end of the working part (5), by a conical transition (7) of the tubular body (1), there is shaped a cylindrical shank (8) to which there is attached a triangular or quadrangular support plate (9) with an elliptical hole, the smaller axis of the ellipse being smaller than the external diameter of the cylindrical shank (8). |
