New tunneler and new clamping ring for intrastromal ring segments implantation

Abstract

Introduction: tunnel creation and corneal ring segments implantation requires great manual ability and precise, flexible instruments. Purpose: to publicize the design of a new mechanical dissector for the implementation of intrastromal ring segments and a new vacuum ring to hold the eyeball during surgery. Methods: taking into account the procedure to be perform as well as geometric and ergonomic considerations, a new mechanical dissector was designed whose geometric and rotation center coincided with the center of the cornea to be treated. At each end of the instrument a tunneler was installed, one clockwise and the other counterclockwise. A vacuum system was adapted to the new clamping ring to immobilize the eye, without obstructing the surgeon’s field of view. Results: the handling and rotation of tunneler is done properly and accurately, with only one hand. This new design allows applying torque evenly when creating the intrastromal tunnel. The field of view of the cornea surface to be treated is much greater. Once the eyeball is attached with the new clamping ring, the patient feels more comfortable and the surgeon can proceed more safely. This ring does not create tension on the surface of the cornea. Conclusions: both the new tunneler and the new clamping ring are innovative contributions to current surgical instruments. These new tools facilitate the surgeon to insert intrastromal rings more easily and more safely, with greater patient comfort.