Blindness Clinical Trial
— CORTIVISOfficial title:
Pilot Study for the Development of a Cortical Visual Neuroprosthesis for the Blind Based on Intracortical Microelectrodes
The objective of this study is to evaluate the usefulness of a cortical visual prosthesis based on intracortical microelectrodes to provide a limited but useful sense of vision to profoundly blind. This pilot study will provide important information on safety and efficacy for the development of an useful cortical visual neuroprosthesis for the blind.
Status | Recruiting |
Enrollment | 5 |
Est. completion date | December 2025 |
Est. primary completion date | October 2025 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years to 70 Years |
Eligibility | Inclusion Criteria: - Participant is capable and willing to provide informed consent for participation in the trial. - Severe visual impairment with bilateral visual loss. - Greater than 18 years of age. - General health: excellent. - Following a general physical and neurological examination, patient must have normal serum electrolytes, C-reactive protein, complete blood count and PT and PTT. - No history of stroke, seizure, coagulopathy, cardiac arrhythmias or ischemia, pulmonary, hepatic or renal disease, nor transmissible viruses such as hepatitis or HIV. - Stable dose of current regular medication for at least four weeks prior to trial entry. - Able to perform the study during the full time period of up to 6 months. Special consideration will be given to patients with (1) detailed medical histories, including documentation of the onset, mechanism and evolution of the blindness; (2) lower risks associated with surgery; and (3) no psychiatric disorders or other mental disabilities. Exclusion Criteria: - Age <18 or >70. - Period of appropriate visual functions < 12 years /lifetime. - For medical reasons: Individuals with a history of seizure disorders, coagulopathy, cardiac arrythmias or ischemia, pulmonary, hepatic or renal disease, and any other neurological disorder. Patients who carry a transmissible virus such as hepatitis and individuals with HIV-related neuropathies. - Vulnerable subject groups (e.g., pregnant women, prisoners, etc.). - Persons unable to give written informed consent prior to participation in the study. - Not able to perform the study during the full time period (at least 3 months). - Any other significant disease or disorder which, in the opinion of the Investigator, may either put the participants at risk because of participation in the trial, or may influence the result of the trial, or the participant's ability to participate in the trial. |
Country | Name | City | State |
---|---|---|---|
Spain | Hospital IMED Elche | Elche | Alicante |
Spain | Universidad Miguel Hernandez de Elche | Elche | Alicante |
Lead Sponsor | Collaborator |
---|---|
Universidad Miguel Hernandez de Elche | Hospital IMED Elche |
Spain,
Alfaro A, Bernabeu A, Agullo C, Parra J, Fernandez E. Hearing colors: an example of brain plasticity. Front Syst Neurosci. 2015 Apr 14;9:56. doi: 10.3389/fnsys.2015.00056. eCollection 2015. — View Citation
Bernabeu A, Alfaro A, Garcia M, Fernandez E. Proton magnetic resonance spectroscopy (1H-MRS) reveals the presence of elevated myo-inositol in the occipital cortex of blind subjects. Neuroimage. 2009 Oct 1;47(4):1172-6. doi: 10.1016/j.neuroimage.2009.04.080. Epub 2009 May 5. — View Citation
Fernandez E, Alfaro A, Soto-Sanchez C, Gonzalez-Lopez P, Lozano AM, Pena S, Grima MD, Rodil A, Gomez B, Chen X, Roelfsema PR, Rolston JD, Davis TS, Normann RA. Visual percepts evoked with an intracortical 96-channel microelectrode array inserted in human occipital cortex. J Clin Invest. 2021 Dec 1;131(23):e151331. doi: 10.1172/JCI151331. — View Citation
Fernandez E, Greger B, House PA, Aranda I, Botella C, Albisua J, Soto-Sanchez C, Alfaro A, Normann RA. Acute human brain responses to intracortical microelectrode arrays: challenges and future prospects. Front Neuroeng. 2014 Jul 21;7:24. doi: 10.3389/fneng.2014.00024. eCollection 2014. — View Citation
Fernandez E, Pelayo F, Romero S, Bongard M, Marin C, Alfaro A, Merabet L. Development of a cortical visual neuroprosthesis for the blind: the relevance of neuroplasticity. J Neural Eng. 2005 Dec;2(4):R1-12. doi: 10.1088/1741-2560/2/4/R01. Epub 2005 Nov 29. — View Citation
Marin C, Fernandez E. Biocompatibility of intracortical microelectrodes: current status and future prospects. Front Neuroeng. 2010 May 28;3:8. doi: 10.3389/fneng.2010.00008. eCollection 2010. — View Citation
Martinez-Alvarez A, Crespo-Cano R, Diaz-Tahoces A, Cuenca-Asensi S, Ferrandez Vicente JM, Fernandez E. Automatic Tuning of a Retina Model for a Cortical Visual Neuroprosthesis Using a Multi-Objective Optimization Genetic Algorithm. Int J Neural Syst. 2016 Nov;26(7):1650021. doi: 10.1142/S0129065716500210. Epub 2016 Mar 29. — View Citation
Maynard EM, Fernandez E, Normann RA. A technique to prevent dural adhesions to chronically implanted microelectrode arrays. J Neurosci Methods. 2000 Apr 15;97(2):93-101. doi: 10.1016/s0165-0270(00)00159-x. — View Citation
Morillas CA, Romero SF, Martinez A, Pelayo FJ, Ros E, Fernandez E. A design framework to model retinas. Biosystems. 2007 Feb;87(2-3):156-63. doi: 10.1016/j.biosystems.2006.09.009. Epub 2006 Sep 7. — View Citation
Normann RA, Fernandez E. Clinical applications of penetrating neural interfaces and Utah Electrode Array technologies. J Neural Eng. 2016 Dec;13(6):061003. doi: 10.1088/1741-2560/13/6/061003. Epub 2016 Oct 20. — View Citation
Normann RA, Greger B, House P, Romero SF, Pelayo F, Fernandez E. Toward the development of a cortically based visual neuroprosthesis. J Neural Eng. 2009 Jun;6(3):035001. doi: 10.1088/1741-2560/6/3/035001. Epub 2009 May 20. Erratum In: J Neural Eng. 2009 Aug;6(4):049802. Greger, Bradley A [corrected to Greger, Bradley]. — View Citation
Warren DJ, Fernandez E, Normann RA. High-resolution two-dimensional spatial mapping of cat striate cortex using a 100-microelectrode array. Neuroscience. 2001;105(1):19-31. doi: 10.1016/s0306-4522(01)00174-9. — View Citation
* Note: There are 12 references in all — Click here to view all references
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Thresholds of visual perceptions elicited by intracortical microstimulation | Charges needed for eliciting visual perceptions through electrical stimulation of the human cortex | Within implantation period (up to 6 months) | |
Secondary | Phosphene mapping | Location of induced perceptions within the visual field by pointing with the finger where the phosphene is perceived | Within implantation period (up to 6 months) | |
Secondary | Visual Acuity | Spatial resolution measured by computerized visual tests | Within implantation period (up to 6 months) | |
Secondary | Motion perception | Correct perception of movement with a coarse pattern moving in one of four directions | Within implantation period (up to 6 months) | |
Secondary | Visual function | Effectiveness of intracortical microstimulation to recognize letters, habitual objects and complex stimulation patterrns as measured by a suite of visual function tests. Questionnaire. | Within implantation period (up to 6 months) | |
Secondary | Number of participants with significant adverse events. | Complications and adverse events will be assessed through participant description of any possible adverse event, neurological examination, clinical tests and a specific questionnaire. | Within implantation period (up to 6 months) |
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