Argus II retinal prosthesis implantation with scleral flap and autogenous temporalis fascia as alternative patch graft material: a 4-year follow-up

The death of outer retinal layers occurring in retinitis pigmentosa causes severe visual impairment and often leads to total blindness. Inner retinal layers are spared, though, which provides a possibility of inducing visual perception by direct electrical stimulation of intact retinal cells. This article presents clinical outcomes of two patients who were the first in Russia to have received the Argus II Retinal Prosthesis System. Both implantations were successful. No complications were reported throughout the entire follow-up period. Upon completing 3 rehabilitation sessions, the patients were able to navigate indoors and outdoors, locate small high-contrast objects, discern contours of large objects and people’s silhouettes.

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Comparative study of type I tympanoplasty using temporalis fascia and tragal cartilage with perichondrium as graft material

International Journal of Otorhinolaryngology and Head and Neck Surgery ◽

10.18203/issn.2454-5929.ijohns20181873 ◽

2018 ◽

Vol 4 (3) ◽

pp. 789

Author(s):

Arvinder Singh Sood ◽

Pooja Pal ◽

Anshul Singla

Keyword(s):

Tertiary Care ◽

Chronic Otitis Media ◽

Type I ◽

Graft Material ◽

Hearing Improvement ◽

Temporalis Fascia ◽

Tertiary Care Centre ◽

Fascia Graft ◽

Uptake Rates

Background: Temporalis fascia and cartilage are the most commonly used graft materials, though contradictory reports are available in literature as regards their efficacy. The purpose of this study was to compare graft acceptance and auditory outcomes of tympanoplasty using cartilage versus temporalis fascia as graft material.Methods: This prospective study included 40 consecutive cases of chronic otitis media in a tertiary care centre randomised in two groups of 20 patients each to be subjected to tympanoplasty using either tragal cartilage-perichondrium or temporalis fascia graft from January 2011 to November 2012. Graft uptake rates and subjective as well as objective hearing improvement at 2 months and 6 months postoperative follow-up were compared. Results: The mean age of presentation was 34.4 years (range 15-60 years). At 2 months post operatively, the graft uptake was better with tragal cartilage group (95%) than temporalis fascia (90%), while at the end of 6 months graft uptake was better with temporalis fascia (75%) compared to tragal cartilage (70%). Hearing improvement was better for tragal cartilage group compared to the temporalis fascia group at both 2 months and 6 months follow-up. The subjective improvement in hearing at the end of 6 months was also better for tragal cartilage- perichondrium group than the temporalis fascia group.Conclusions: Both temporalis fascia and tragal cartilage–perichondrium are suitable graft materials for tympanoplasty. Graft uptake was superior with temporalis fascia, while hearing improvement was better with tragal cartilage- perichondrium, although the results were not statistically significant.

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Argus II Retinal Prosthesis Implantation Using Three-Dimensional Visualization System

Retina ◽

10.1097/iae.0000000000002296 ◽

2019 ◽

Vol 39 ◽

pp. S199-S200 ◽

Cited By ~ 1

Author(s):

Aleksandra Rachitskaya ◽

Leslie Lane ◽

Justis Ehlers ◽

Meghan DeBenedictis ◽

Alex Yuan

Keyword(s):

Three Dimensional ◽

Retinal Prosthesis ◽

Prosthesis Implantation ◽

Visualization System ◽

Argus Ii

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One-year anatomical and functional outcomes of the Argus II implantation in Korean patients with late-stage retinitis pigmentosa: A prospective case series study

Ophthalmologica ◽

10.1159/000513585 ◽

2020 ◽

Author(s):

Young Hee Yoon ◽

Mark Humayun ◽

Yoon Jeon Kim

Keyword(s):

Retinitis Pigmentosa ◽

Functional Outcomes ◽

Retinal Prosthesis ◽

Optimal Placement ◽

Functional Evaluation ◽

Ability Test ◽

Prosthesis Implantation ◽

Korean Patients ◽

Case Series Study ◽

Argus Ii

Purpose: To report the anatomical and functional outcomes of Argus II retinal prosthesis implantation in Korean patients Methods:We included five consecutive patients with end-stage retinitis pigmentosa (RP) who underwent Argus II retinal prosthesis implantation and followed for at least 12 months. The transcorneal electrical evoked response was utilized for patient selection. We used intraoperative optical coherence tomography (OCT) for optimal placement of the array and provided specialized vision rehabilitation training. Morphological evaluation using SD-OCT and functional evaluation using computer-based visual function tests (CVFT), a letter reading ability test, and the Functional Low-Vision Observer Rated Assessment (FLORA) were conducted. Results: Postoperatively, the array was completely apposed to the retinal surface in all eyes except for one eye that had a preexisting macular concavity. Fibrosis-like tissues of ≥ 50-μm thickness developed at the interface in two eyes. All patients showed improvement in CVFT, and could read ETDRS letters at a distance of 50 cm. Three patients could read Korean words. FLORA was improved in all patients, mainly in tasks of visual mobility, daily activities, and social interactions. Conclusions: Along with good anatomical outcomes and specialized rehabilitation practices, recipients of the Argus II implant showed profound improvements in functional vision and mobility.

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The use of collagen matrix (Ologen) as a patch graft in glaucoma tube shunt surgery, a retrospective chart review

F1000Research ◽

10.12688/f1000research.9232.1 ◽

2016 ◽

Vol 5 ◽

pp. 1898 ◽

Cited By ~ 5

Author(s):

John D. Stephens ◽

Steven R. Sarkisian, Jr.

Keyword(s):

Retrospective Chart Review ◽

Collagen Matrix ◽

Graft Material ◽

Shunt Surgery ◽

Safety And Efficacy ◽

Patch Graft ◽

Glaucoma Tube Shunt ◽

Tube Shunt ◽

Matrix Patch

Purpose: To determine the safety and efficacy of collagen matrix as a patch graft in glaucoma drainage surgery. Collagen matrix grafts may be advantageous because they do not need to be harvested from human donors. Methods: An institutional, retrospective review of 43 patients with at least 12 months follow-up status post-glaucoma drainage implant surgery were evaluated for signs of tube erosion after initial placement of collagen matrix patch graft. Results: Forty-one of 43 eyes (95.3%) required no intervention for patch graft melting with tube erosion. Average time of follow-up was 32 months (range: 12-45). Two cases had tube erosion at 4 months and 26 months post-op requiring tube revision, which was successfully revised with conjunctiva (4 month erosion) and donor sclera (26 month erosion). Conclusion: Our results suggest that collagen matrix patch grafts may be used successfully as a patch graft in glaucoma tube shunt surgery, and may be advantageous because they do not have to be harvested from human donors. It is possible that exposure rates may be higher after longer follow-up and with larger numbers of patients. Further research is needed to compare Ologen to traditional graft materials to conclusively determine the safety and efficacy of collagen matrix as a novel patch graft material.

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The Argus-II Retinal Prosthesis Implantation; From the Global to Local Successful Experience

Frontiers in Neuroscience ◽

10.3389/fnins.2018.00584 ◽

2018 ◽

Vol 12 ◽

Cited By ~ 8

Author(s):

Mohsen Farvardin ◽

Mehrdad Afarid ◽

Adel Attarzadeh ◽

Mohammad K. Johari ◽

Morsal Mehryar ◽

...

Keyword(s):

Retinal Prosthesis ◽

Prosthesis Implantation ◽

Argus Ii

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Usage of E-Polytetrafluoroethylene (e-PTFE) Membrane for Managing Trabeculectomy Flap- Related Over-Filtration Due to Unavailability of Scleral Patch Graft during Nation-Wide Lockdown

Global Journal of Medical Research ◽

10.34257/gjmrfvol21is7pg1 ◽

2021 ◽

pp. 1-11

Author(s):

Prasanna Venkatesh Ramesh ◽

Shruthy Vaishali Ramesh ◽

Prajnya Ray ◽

Aji K ◽

Lalith Kumar S ◽

...

Keyword(s):

Anterior Chamber ◽

Case Series ◽

Implant Stability ◽

Scleral Flap ◽

Eye Banking ◽

Ptfe Membrane ◽

Pros And Cons ◽

Patch Graft ◽

Shallow Anterior Chamber

Scleral flap tears during trabeculectomy are difficult to repair in a predictable fashion. Donor scleral flap reinforcements are commonly preferred for managing trabeculectomy flap-related over-filtration, leading to shallow anterior chamber (AC). Due to the advent of COVID-19 lockdown, especially in the initial phases, eye banking activities almost came to a standstill, with almost no corneal and/or scleral tissue retrievals. Hence, in this manuscript we have presented a mini case series with follow-up of two of our cases; where Gore-Tex (e-polytetrafluoroethylene) implant was used as an alternative to scleral patch graft, for managing trabeculectomy flap-related over-filtration, with their pros and cons. Though Gore-Tex implant stability in both cases were contentious, it still served the purpose of managing the flap-related over- filtration and subsequent shallow AC.

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Prospective study on technique of graft fishing with anterior tucking in type 1 tympanoplasty and its hearing outcome

International Journal of Otorhinolaryngology and Head and Neck Surgery ◽

10.18203/issn.2454-5929.ijohns20205067 ◽

2020 ◽

Vol 6 (12) ◽

pp. 2243

Author(s):

Digant Patni ◽

Ankit Mishra ◽

Dinesh Patel ◽

Vishal R. Munjal

Keyword(s):

Hearing Loss ◽

Prospective Study ◽

Success Rate ◽

Chronic Otitis Media ◽

Type I ◽

Graft Material ◽

Temporalis Fascia ◽

Fascia Graft ◽

Conductive Hearing

Background: Chronic otitis media (COM) is a common health problem in developing world and has a major impact on patient in the form of hearing loss. Temporalis fascia is commonest graft material used for tympanoplasty as it is readily available through same post aural incision. The study was conducted with an aim to find out the effectiveness of fishing technique and anterior tucking in terms of graft stability, graft uptake, hearing improvement and complications.Methods: The present study is prospective study conducted on patients with complains of otorrhea and hearing loss, of age between 15 to 60 years, during the period January 2017 to June 2018. Patients with inactive mucosal COM and pure conductive hearing loss who underwent type-I tympanoplasty were included. Patients with cholesteatoma, ossicular pathology, trauma, mixed or sensorineural hearing loss, were excluded. Paired ‘t’ test was applied to compare preoperative and postoperative mean air-bone gap.Results: In our study total 123 patients were analysed for the follow-up period of 6 months and it was observed that graft was well accepted in 93.5% patients while in 4.8% patients residual anterior perforation was found and in 1.7% patients the graft was completely rejected, showing an overall success rate at the end of 6 months follow-up to be 93.5%. There was a statistically significant improvement in hearing gain at the end of 6 months follow-up (p<0.05).Conclusions: Tympanoplasty with temporalis fascia graft using fishing and anterior tucking technique gave good dimensional stability to graft, preventing lateralization / medialization of graft. The superiorly based circumferential flap allowed for 360 degree placement of graft and anterior tucking, with overall high success rate and lower rate of complications and graft rejection.

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Argus II Retinal Prosthesis System for peripheral retinal degeneration

Frontiers in Neuroengineering ◽

10.3389/conf.fneng.2014.11.00008 ◽

2014 ◽

Vol 7 ◽

Cited By ~ 1

Author(s):

Arsiero Maura

Keyword(s):

Retinal Degeneration ◽

Retinal Prosthesis ◽

Argus Ii

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