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Dina Joy K. Abulon, Makoto Inoue, David C. Buboltz; Comparison of Blade and Incision Architecture between New 25- and 23-ga Microvitreoretinal (MVR) Blades and Current Sclerotomy Entry Systems. Invest. Ophthalmol. Vis. Sci. 2011;52(14):6127.
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© ARVO (1962-2015); The Authors (2016-present)
To compare the blade sharpness and incision architecture of various 25- and 23-ga sutureless trocar and MVR blades at oblique and straight angles of entry.
The 25- and 23-ga test samples included new MVR blade designs, conventional trocar blades, and round-tipped trocars (23-ga only). A Scanning Electron Microscope (SEM) imaged cutting surfaces of each blade (n=7). In another test, high magnification imaging measured the incision length and linearity of straight and obliquely angled incisions through a circular silicon coupon (n=70). Wound proof pressure testing was conducted on porcine sclerotomy sites after simulated vitrectomy (n=30).
Incision shape and SEM analysis showed distinct differences in blade design and incision geometry: conventional beveled trocar blades generated asymmetrical chevron-shaped incisions, round-tipped trocar blades generated semi-circular incisions, new symmetrical MVR blades generated linear incisions, while a fourth MVR blade design generated a flattened M-shaped incision. The new 25-ga symmetrical MVR blade generated the smallest wound geometry with an incision length of 19.9 ± 0.9 µm (straight incision), linearity measurement of 0.2 ± 0.1 µm (straight incision), oblique incision length of 18.2 ± 1.1 µm, and oblique linearity measurement of 0.8 ± 0.2 µm (all P<0.05). In wound leakage tests, the new symmetrical MVR blades leaked the least in every test (4 tests per blade).
Compared to all tested blades, the new symmetrical MVR blades suggest better wound architecture by generating less wound leakage, shorter incision lengths, and more linear wound apposition.
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