Osteosynthetic clamp for attaching a bone anchor to a support rod

An osteosynthetic clamp for use in attaching a bone anchor to a support rod, the clamp comprising:

• a carrier with a first portion adapted for connection to the bone anchor and with a second portion adapted for connection to the support rod;
• a clamping hook, the hook including a bight wherein the bight is sized and configured to receive the support rod, and a head that passes through an elongate aperture in the second portion of the carrier;
• a collar located in-between the clamping hook and the carrier, and through which the head of the clamping hook passes, and which is attached to the second portion of the carrier by engaging, complementarily shaped parts defined respectively by the edges of the elongate aperture and by the collar that together form a joint permitting the collar to be longitudinally adjustable toward or away from the bone anchor by sliding the collar along the elongated aperture;
• and
• a fastener that can be secured to the head of the clamping hook and tightened to press the carrier via the collar against the support rod located in the bight of the clamping hook in order to clamp the support rod within the bight.