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Fluid dynamics and intraocular pressure using venturi phacoemulsification machine in dogs ex vivo
Author(s) -
Kang Seonmi,
Park Sangwan,
Noh Hyunwoo,
Seo Kangmoon
Publication year - 2015
Publication title -
veterinary ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.594
H-Index - 50
eISSN - 1463-5224
pISSN - 1463-5216
DOI - 10.1111/vop.12231
Subject(s) - phacoemulsification , venturi effect , intraocular pressure , materials science , ophthalmology , biomedical engineering , medicine , mechanical engineering , engineering , visual acuity , inlet
Objective To optimize fluid dynamics through measuring intraocular pressure ( IOP ) in a venturi phacoemulsification machine in dogs. Procedures In step I, flow and IOP of the test chamber were measured using a pressure transducer with the bottle height ( BH ) set at 50, 70, 100, and 120 cm and the vacuum from 30 to 450 mmHg. A 19‐gauge phaco and a 0.3‐mm irrigation/aspiration (I/A) handpiece were used. In step II , flow and IOP were measured in an enucleated canine eye with a 3.0‐ and a 3.2‐mm clear corneal incision ( CCI ), respectively. IOP was measured using the pressure transducer at a 30‐mmHg vacuum to allow corneal deformation, to define the fluidic parameters for preventing surge. Results Flow was directly proportional to the BH and vacuum, whereas IOP was directly proportional to the BH and inversely to the vacuum. Flow with an I/A handpiece was significantly less than with a phaco handpiece, explaining why IOP with an I/A handpiece was significantly higher than with a phaco handpiece. With the I/A handpiece, vacuum parameters less than 450 mmHg did not result in corneal deformation. IOP with a 3.2‐mm CCI was significantly lower than with a 3.0‐mm CCI , with the 3.2‐mm flow being greater than the 3.0‐mm flow. Conclusions BH during the I/A stage could be reduced to avoid unnecessary stress on the canine eye when using a venturi system. Although phacoemulsification with a 3.2‐mm CCI could induce lower IOP , a 3.0‐mm CCI might lessen the irrigation flow stress on the eye.