New retinal tack designs: an analysis of retention forces in human scleral tissue.

Autor: Schulze Schwering M; Centre for Ophthalmology, University Eye Hospital, Tübingen, Germany., Oltrup T; Section for Experimental Eye Surgery and Refractive Surgery, Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Schleichstr. 12/1, 72076, Tübingen, Germany. toltrup@deos-tuebingen.de., Rückheim KS; Section for Experimental Eye Surgery and Refractive Surgery, Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Schleichstr. 12/1, 72076, Tübingen, Germany., Bende T; Section for Experimental Eye Surgery and Refractive Surgery, Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Schleichstr. 12/1, 72076, Tübingen, Germany., Bartz-Schmidt KU; Centre for Ophthalmology, University Eye Hospital, Tübingen, Germany., Leitritz MA; Section for Experimental Eye Surgery and Refractive Surgery, Centre for Ophthalmology, University Eye Hospital, Eberhard Karls University of Tübingen, Schleichstr. 12/1, 72076, Tübingen, Germany.
Jazyk: angličtina
Zdroj: Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie [Graefes Arch Clin Exp Ophthalmol] 2020 Jul; Vol. 258 (7), pp. 1389-1394. Date of Electronic Publication: 2020 Apr 29.
DOI: 10.1007/s00417-020-04689-6
Abstrakt: Purpose: The study aimed to construct a new retinal tack design with high retention forces to prevent spontaneous disentanglement in cases of complicated retinal surgery.
Methods: Six new forms for the peak of a retinal tack were developed using computer-aided design (CAD); then a prototype was produced for each model. Finally, standardised design testing was conducted using human (ex vivo) sclera by logging 15 consecutive measurements for each model.
Results: Seven different models underwent pull-out testing (six new models and the original tack model), but two tack models (Model 4, Model 5) failed to penetrate the human tissue. The highest pull-out forces (median) were measured for Model 3, followed by Model 6, Model 2 and Model 1. The original Heimann tack (Model H) was found to have the lowest retention forces.
Conclusion: The different tack designs altered the penetration and holding forces. The retention forces of the proposed peak design led to a significant increase in the retention forces that were more than twice as high as those in the original Heimann Model.
Databáze: MEDLINE
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