Stabilization device for stabilizing vertebrae or other bones is provided including at least two rods (100, 101) having a different diameter； an anchoring element (1) having a shaft (2) for anchoring in the bone and a head (3)； a receiving part (5) for connecting one rod from the at least two rods to the anchoring element； the receiving part comprising a top end (9a) and a bottom end (17b)； a rod receiving portion (9) with a channel (12) for receiving the rod (6), and a head receiving portion (17) for accommodating a head (3) of the bone anchoring element, the head receiving portion having an open end (19, 17b) and being flexible so as to allow introduction and clamping of the head； and a locking ring (8) embracing the head receiving portion (17), wherein the head is clamped by pressing onto the locking ring with the rod to move the locking ring towards the open end (17b)； wherein the locking ring (8) has a surface portion (86a, 86a') configured to contact each of the rods (100, 101) in a circumferential direction at at least two distinct contact areas (P1, P2).本案提供一種穩定椎骨或其他骨骼用之穩定裝置，包含至少二桿件(100,101)，有不同直徑：固定元件(1)，有固定於骨骼用之軸部(2)，和頭部(3)；容納件(5)，把至少二桿件中之一桿件連接至固定元件；容納件包括：頂端(9a)和底端(17b)；桿件容納部(9)，有凹溝(12)可容納桿件(6)；和頭部容納部(17)，供包容骨骼固定元件之頭部(3)，而頭部容納部有開口端(19,17b)，具撓性，容許引進並夾持頭部；以及鎖環(8)，包圍頭部容納部(17)，其中以桿件壓在鎖環，把鎖環朝口端(17b)運動，把頭部夾持；其中鎖環(8)具有表面部(86a,86a')，構成在至少二截然不同的接觸區(P1,P2)，沿周緣方向接觸各桿件(100,101)。
