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Niklas Plange, Antonis Koutsonas, Peter Walter; First implantation of a telemetric, intraocular pressure sensor in patients with glaucoma. Invest. Ophthalmol. Vis. Sci. 2013;54(15):5643.
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To investigate safety and intraocular pressure (IOP) measurement of a telemetric intraocular pressure sensor in patients with glaucoma.
5 patients with glaucoma were included in a prospective single-center clinical trial (follow-up 3 months-1 year). The ring-shaped telemetric IOP sensor (ARGOS, Implandata Ophthalmic Products GmbH, Hannover, Germany) is a miniature device with eight pressure-sensitive capacitors included in a single substrate Application-Specific Integrated Circuit (ASIC) combined with a circular micro coil antenna. The device is completely encapsulated in silicone rubber with an outside diameter of 11.3 mm. A reader unit uses a high frequency magnetic field for power and data transmission.
The implantation of the telemetric pressure sensor was successfully performed in the ciliary sulcus at the end of a planned cataract surgery with implantation of an intracapsular lens. The sensor was implanted using a 5.5 mm clear corneal incision. Three patients had a significant sterile anterior chamber inflammation 2 days after surgery that resolved 7 days later following intensive anti-inflammatory treatment. In all patients, IOP measurement was successfully performed at all visits. All patients successfully performed home self-tonometry after a short instruction.
Despite an early postoperative anterior chamber inflammation in some patients, the IOP sensor was well tolerated in all patients during follow-up. For the first time, continous IOP monitoring using a non-contact intraocular pressure sensor seems possible in glaucoma patients. The variability of IOP values using the ARGOS sensor compared to Goldmann applanation tonometry has yet to be evaluated.
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