Trocar-assisted hangback an option for iridodialysis repair
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While performing an iris repair procedure, the surgeon needs to be cautious to not imbibe the corneal tissue in the suture needle.

Inadvertent involvement of the corneal fibers leads to non-sliding of the suture inside the anterior chamber and failure of the surgical procedure. This has been highlighted by various surgeons who perform iris repair, and instructions to overcome this have been emphasized with a word of caution. The technique of non-appositional (hangback) repair was described by Snyder and colleagues. The author present a technique of trocar-assisted hang back for iridodialysis repair that helps the surgeon to navigate skillfully through iris repair without involving the corneal fibers in the suture needle.

A 25-gauge trocar is introduced from the limbal site, with care being taken not to touch the corneal endothelium with the tip of the trocar needle. Once the trocar is placed in position, the needle is withdrawn, and the shaft of the trocar remains in situ at the limbal site. The shaft of the trocar now acts as a lever through which a 9-0 suture needle with a long arm can be introduced for iridodialysis repair without the fear of imbibing the corneal fibers. Initially, one arm of the suture needle is introduced through the trocar and guided inside the eye so as to engage and pass through the peripheral disinserted iris tissue. A 30-gauge needle is introduced from the sclera at the level of the original insertion of the iris. The suture needle is docked into the barrel of the 30-gauge needle and withdrawn from the eye. Subsequently, the second arm of the needle is passed through an area adjacent to the previous site from where the needle was passed, and the suture needle is withdrawn by engaging it in the 30-gauge needle. Both the suture ends are tied, and the knot is buried into the scleral wall.

The author has previously described the application of a trocar cannula for maintaining fluid infusion inside the eye. A specially designed trocar-anterior chamber maintainer can also be used for the same purpose. Placing a trocar imparts maneuverability in approximately 90° to 120° of the circumference of the cornea. The trocar needs to be placed in the direction opposite to the disinserted iris tissue. In cases with massive iridodialysis, after the completion of a segmental iridodialysis, the trocar can be withdrawn and placed in another quadrant. The guided approach with trocar-assisted hang back is helpful to surgeons, and it nullifies the aspect of non-sliding of the suture due to its imbibement in the corneal fibers.

Source: https://www.healio.com/news/ophthalmology/20201001/trocarassisted-hangback-an-option-for-iridodialysis-repair
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