April 2011
Volume 52, Issue 14
ARVO Annual Meeting Abstract  |   April 2011
Comparison of Blade and Incision Architecture between New 25- and 23-ga Microvitreoretinal (MVR) Blades and Current Sclerotomy Entry Systems
Author Affiliations & Notes
  • Dina Joy K. Abulon
    Medical Affairs, Alcon Labs, Irvine, California
  • Makoto Inoue
    Ophthalmology, Kyorin Eye Center, Mitaka, Japan
  • David C. Buboltz
    Medical Affairs, Alcon Laboratories, Irvine, California
  • Footnotes
    Commercial Relationships  Dina Joy K. Abulon, Alcon Research, Ltd. (E); Makoto Inoue, Alcon Laboratories, Inc. (C); David C. Buboltz, Alcon Research, Ltd. (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 6127. doi:
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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)

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Purpose: : 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.

Methods: : 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).

Results: : 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).

Conclusions: : 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.

Keywords: vitreoretinal surgery 

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