Device to prevent and collapse to expand the pupil of the eye

摘要

It is a device to prevent the collapse and to expand the pupil of the eye in a ophthalmic surgery. Configured continuous or as a discontinuous ring 47 device comprises a flange 48, 49, 50 and 51 in the plurality of notches 55, 56, 57, 58, and edges in the corner. Ring, together are formed from strands consisting of resilient and flexible any material, entirely arranged in a single plane. Notch release press these together with the engagement of the pupil edge in different parts, to expand the pupil sustained. The present device, notches, and cause bending pupil edge and the iris in the upper and lower flange, thereby achieving a reliable engagement. By expansion of the resulting pupil by the ring, and earlier had been blocked for the pupil is small, it is possible to wide field of view for the deep structure than leading to the pupil plane.