| 摘要 |
A compact external fixator for the treatment of fractures in small bones and in children comprises a pair of clamps (2, 3) for bone bolts (V) connected by means of corresponding ball joints (5, 6) to a central body (4) comprising at least one male member (7) and one female member (8) which are joined telescopically. One member (7) is made of a material which is highly transparent to X-rays, the other (8) of a rigid substantially radio-opaque material having walls of a minimum thickness. Anti-rotation means between the male (7) and the female (8) telescopic member are provided; transverse eccentric pins (34, 35) are housed in each clamp to act on corresponding locking blocks (28, 29) which immobilise the balls (24, 25) of the joints. A tensioning device (36) applicable to the fixator (1) comprises hook formations (49, 50) which can be coupled to ends of the telescopic members (7, 8) and are attached to the ends of counter-threaded rods (43, 44) screwed in the threaded portions of a rotatable sleeve (37). The fixator permits full X-ray examination of the fracture even through the central body, and is light and small as a result of the arrangement of the locking means for the joints within the clamps. <IMAGE> |
