May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
The Development of a Guiding Tool for Transchoroidal Subretinal Chip Implantation to Protect the Retina
Author Affiliations & Notes
  • H. G. Sachs
    University Eye Clinic, University of Regensburg, Regensburg, Germany
  • U. Brunner
    University Eye Clinic, University of Regensburg, Regensburg, Germany
  • F. Gekeler
    Dept of Ophthalmology,
    University of Tuebingen, Tuebingen, Germany
  • K.-U. Bartz-Schmidt
    Dept of Ophthalmology,
    University of Tuebingen, Tuebingen, Germany
  • V.-P. Gabel
    Ophthalmology, Maximiliansklinik Nürnberg, Nürnberg, Germany
  • W. Wrobel
    Retina Implant AG, Reutlingen, Germany
  • A. Hekmat
    Retina Implant AG, Reutlingen, Germany
  • E. Zrenner
    Institute of Ophthalmic Research,
    University of Tuebingen, Tuebingen, Germany
  • Footnotes
    Commercial Relationships  H.G. Sachs, Retina Implant AG, F; Retina Implant AG, P; U. Brunner, None; F. Gekeler, Retina Implant AG, F; K. Bartz-Schmidt, None; V. Gabel, Retina Implant AG, F; Retina Implant AG, P; W. Wrobel, Retina Implant AG, I; Retina Implant AG, E; Retina Implant AG, P; A. Hekmat, Retina Implant AG, E; Retina Implant AG, P; E. Zrenner, Retina Implant AG, F; Retina Implant AG, P.
  • Footnotes
    Support  supported by Retina Implant AG
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 4045. doi:https://doi.org/
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      H. G. Sachs, U. Brunner, F. Gekeler, K.-U. Bartz-Schmidt, V.-P. Gabel, W. Wrobel, A. Hekmat, E. Zrenner; The Development of a Guiding Tool for Transchoroidal Subretinal Chip Implantation to Protect the Retina. Invest. Ophthalmol. Vis. Sci. 2008;49(13):4045. doi: https://doi.org/.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Purpose: : The protection of the retina during a transchoroidal implantation procedure is mandatory. Due to the fact that there is no visibility of the retinal situation while the implant is placed a protective shield is advantageous. The aim was a minimal traumatic implantation of a 3mm wide cable-bound chip with a transchoroidal connecting cable.

Methods: : In experiments with laboratory animals the requirements for the material,dimensions and shape of the shielding guide were determined. A method of preparation of the choroid was developed to have an almost bloodless penetration of the choroid. Different prototypes of guiding foils were tested and served as implantation instruments in 22 implantations in domestic pigs. These prototypes were optimized in geometry, material and stability to achieve an instrument which could be used in human implantations. The final design was tested in 7 implantations in humans.

Results: : The optimized foil structure was stable enough to mechanically separate retina from underlying RPE. Too soft and thin materials are contraproductive in the implantation process. Transparent material is advantageous to observe the retinal behaviour during the implantation at the site of choroidal penetration. Optimal performance was achieved with 50 µm transparent Polypropylen with lance shaped tip. Retinal prolapse through the choroidal window was prevented from in all human implantations. Radiodiathermy proved ideal to prevent the choroid from bleeding during the implantation in animal and humans.

Conclusions: : With this instrument a minimal traumatic implantation of subretinal devices can be achieved. Transchoroidal surgery for chip implantation is manageable and made easy by this device and by the use of radiodiathermy. The experience of the requirements for a transchoroidal procedure could be of potential interest for other applications targeting the subretinal or subchoroidal space e.g. drug delivery.

Clinical Trial: : www.clinicaltrials.gov NTC00515814

Keywords: vitreoretinal surgery • retina 
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×