Gelpi Retractor 5.5” Sharp Points. A self-retaining, small spreader suitable for small sites such as for perineal surgery in dogs or laryngotomy in horses. Two blades, hinged in the middle, separate as the handles are closed and are held open by a rachet. The blades turn down at right angles at their tips, and are bowed towards each other so that they push the edges of the incision apart and retain themselves in it.