Intraocular Pressure Measurement by Radio Wave Telemetry

Abstract

The WIT is well tolerated by the rabbit eye. Its measurements are reproducible and in close concordance with manometry. A downward IOP drift warrants further investigation.

The Boston keratoprosthesis 2014: a step in the evolution of artificial corneas

“…Also, identification by several investigators of transparent and relatively inert plastics (polymethylmethacrylate, etc.) for the manufacturing of devices (particularly Stone and Herbert [78]), as well as the introduction of better surgical techniques at that time, resulted in improved keratoprosthesis (KPro) outcomes. Moreover, varied KPro designs were presented by a number of investigators in the early 1950s-virtually all presently used configurations were already suggested at that time (reviewed by Cardona [19]).…”

Boston type I keratoprosthesis: Review

“…Tele metric IOP measurement allows monitoring of IOP in patients who cannot be measured by current methods, such as patients with kera toprosthesis. A recent experimental study of telemetric IOP records used a wireless transducer implanted in rabbits after extracapsular lens extraction demonstrating concordance with direct manometry measures (42) . Further studies are necessary, however, to validate its use and safety in human eyes.…”

A microscale optical implant for continuous in vivo monitoring of intraocular pressure

“…The implantable IOP sensor is three orders of magnitude smaller than commercially available devices 48,65 , minimizing the risks associated with implantation procedures as well as post surgery and long-term complications. We profiled dynamic changes of IOP in anesthetized rabbits for short-term (1 h) and in awake rabbits for long-term (4.5 months) periods, with an average accuracy of 0.29 mm Hg at a rate of 10 Hz over the physiologically interested range of 0-40 mm Hg.…”

“…Such measurements can only be obtained for up to 24 h because of side complications that accompany long-term use [41][42][43] . To overcome the aforementioned limitations, implants based on radio-frequency (RF) technologies have been used to monitor endovascular pressure 44 , intracranial pressure (ICP) 45,46 , and IOP [47][48][49][50][51][52][53][54][55][56][57][58] . The typical size of these implants ranges from a millimeter to a few centimetres.…”