A Novel, Low-Cost Alternative to Traditional Glaucoma Surgeries.

Purpose: To investigate the real-world efficacy of a novel, low-cost glaucoma drainage device in canine and human patients. Methods: A retrospective case series of 17 eyes in 14 canines and one eye of a human patient who each underwent novel drainage device implantation is described. This device was constructed by insertion and advancement of a 24-gauge cannula (canine) or 23-gauge cannula (human) perpendicularly through five adjacent tubes of a 25-mm Yeates surgical drain. Results: Of the canine patients, the average follow-up period was 362 days (range, 27-863). The mean preoperative intraocular pressure (IOP) was 50.9 ± 17.9 mm Hg. Following tube surgery, IOP was maintained at <20 mm Hg in 81.3%, 100%, 100%, 85.7%, 100%, and 75.0% of eyes at 1, 2, 3, 6, 9, and 12 months, respectively. Bleb needling and/or revisions were required in five eyes. Enucleations and/or device explantations were performed in five eyes at mean day 140. In the human case, the device was implanted in the right eye of a 64-year-old male with refractory raised IOP (55 mm Hg) despite maximum medical therapy. IOP was well controlled until day 818, when eventual tissue breakdown necessitated device removal. Conclusions: This design represents a novel, low-cost, effective alternative to traditional glaucoma tube devices. Translational Relevance: This device has great potential for use in regions where the needs for glaucoma drainage devices and surgical alternatives to trabeculectomy have not been met. Further development may include tube crimping or fenestration and preoperative loading of slow-release antibiotics and/or anti-metabolite medications within the non-draining lumens.