A self-retaining retrobulbar catheter has been designed to deliver medication to the retrobulbar space. The catheter is similar to the one developed for treating retinal detachment, except that it has two lumens.1 One lumen transfers medication, the other inflates a balloon at the tip of the catheter. The balloon serves to hold the catheter in place. No sutures are required.
The catheter is made of an inert soft plastic, and the tip of the balloon is made of silicone-coated latex. It measures 1.9 mm in diameter and 14 cm in length. The tube that carries medication to the orbit is sealed at its proximal end with a gum-rubber adapter that accepts a 26-gauge needle. The tube for inflating the balloon has a spring-loaded adapter that opens when the male end of a tuberculin syringe is inserted. The balloon is inflated with 0.5 to 1.0 mL of sterile water (Figure