IRIS PILOT - Extended Pilot Study With a Retinal Implant System
Recruitment status was: Active, not recruiting
|Retinitis Pigmentosa Cone-Rod Dystrophy Choroideremia||Device: Retinal Implant System (IRIS)|
|Study Design:||Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
|Official Title:||Extended Pilot Study to Evaluate Pattern Recognition With a Chronic Retinal Implant System|
- Investigate whether blind subjects that fulfill the patient criteria provided with a Retinal Implant are able to differentiate between simple patterns like horizontal bar, vertical bar and cross. [ Time Frame: 18 months ]
- Secondary goals of this study phase are: Further evaluation of stimulation parameters, Light localization with use of camera, Safety verification of stimulation parameters [ Time Frame: 18 months ]
|Study Start Date:||December 2006|
|Estimated Study Completion Date:||December 2010|
|Estimated Primary Completion Date:||November 2010 (Final data collection date for primary outcome measure)|
Device: Retinal Implant System (IRIS)
The Retinal Implant System consists of three main components, the Retinal Stimulator, which is the component actually implanted into the eye, the visual interface, and the Pocket Processor The Retinal Stimulator will be implanted into the eye of a blind subject during a surgical operation. However, the external components are activated only during the test sessions under the control of the investigator team. In a first step of the investigation a software controlled system on a PC which is connected to the Pocket Processor via Ethernet interface, will generate the defined stimulation patterns (bars, crosses, cubes). During the test session, the blind subject is exposed to a series of these stimulation patterns and he / she has to describe the visual perceptions. Based on his descriptions and in an interactive way, the stimulation signal is subsequently be modulated by changing parameters like amplitude, duration of impulse, polarity, number of repetitions or pulse frequency on the PC.
In a second step the visual interface is equipped with a camera which presents realtime images to the subject. Data obtained from the investigation with computer generated patterns in the first step are used in the second step to improve the fitting software for the use in the camera supported system.
Finally the system should enable the subject to recognize simple images supported from the camera.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00427180
|Principal Investigator:||Gisbert Richard, Prof.||Klinik und Poliklinik für Augenheilkunde Hamburg-Eppendorf|