Vertebral surgical instrument - has cannula with feed for selected volume of fluid

摘要

Surgical instrument determines fluid filling for inserted vertebral disc prostheses. A cannula (7) should have an outside diameter smaller than the operation entry (4) in the disc fibre ring (3) and the front part of the canula should be enclosed in a flexible balloon (9) sealably fixed to the canula. A fluid feed device (12) introduces a preset volume of fluid through the canula into the balloon. USE/ADVANTAGE - Surgery, disc prosthesis Disc filled with preset fluid volume to simulate natural disc using canula and balloon metering device.