In one aspect, a dual bevel needle includes a hollow tube having a proximal end, a distal end, a first side, a second side opposite the first side, and a medium A first needle tip at the distal end of the empty tube, a second tip at the distal end of the hollow tube, and a first on each of the first side and the second side. A first slope having a first slope angle relative to the longitudinal axis of the tube, and a second slope on each of the first side and the second side, A second ramp having a second ramp angle with respect to the longitudinal axis, the first and second ramps each forming an elliptical section, the ellipse having an inner cutting edge and the distal end of the tube The second bevel angle is shallower than the first bevel angle and the second bevel is positioned adjacent to the proximal end of the first bevel. It is attached, and the inner cutting edge is converged to a narrow heel. [Selection] Figure 1D１つの態様において、二重（ｄｕａｌ）斜面ニードルは、近位端、遠位端、第１の側部、第１の側部の反対側の第２の側部を有する中空管と、中空管の遠位端にある第１のニードル尖端と、中空管の遠位端にある第２の尖端と、第１の側部および第２の側部の各々の上にある第１の斜面であり、管の長手方向軸に対し第１の斜面角度を有する第１の斜面と、第１の側部および第２の側部の各々の上にある第２の斜面であり、管の長手方向軸に対して第２の斜面角度を有する第２の斜面とを備え、第１および第２の斜面は各々楕円の区分を形成し、その楕円は内側刃先を有するとともに管の遠位端にある第１および第２のニードル尖端で終端し、第２の斜面角度は第１の斜面角度より浅く、第２の斜面は第１の斜面の近位側の端部に隣接して位置付けされ、かつ内側刃先は狭いヒール部に収束している。【選択図】図１Ｄ
