AIM: To report a novel method to quantify traction applied to the retina using vitreous cutters during pars plana vitrectomy. METHODS: Fresh porcine eyes were positioned in a specially developed holder and transfixed to the retinal layers with a wire and the other end fixed to the load cell of a strain gauge. Five separate 20-gauge electrical drive mechanism vitrectors were introduced into the eye at a 45 degrees angle and positioned at a distance of either 3 or 5 mm from the retina. Data from the strain gauge were acquired and the traction force computed. RESULTS: The analysis revealed that the vitreoretinal traction increased by 7.90 dynes for each 100 mm Hg increase in vacuum (p<0.05). The traction forces decreased by 2.51 dynes for each 500 cuts per minute increased (p<0.05) and the traction force increased by 2.17 dynes at 3 mm compared with 5 mm (p<0.05). CONCLUSION: The traction was directly proportional to the aspiration vacuum and inversely proportional to the cut rate. The cutter traction force increased with proximity to the retina.
AIM: To report a novel method to quantify traction applied to the retina using vitreous cutters during pars plana vitrectomy. METHODS: Fresh porcine eyes were positioned in a specially developed holder and transfixed to the retinal layers with a wire and the other end fixed to the load cell of a strain gauge. Five separate 20-gauge electrical drive mechanism vitrectors were introduced into the eye at a 45 degrees angle and positioned at a distance of either 3 or 5 mm from the retina. Data from the strain gauge were acquired and the traction force computed. RESULTS: The analysis revealed that the vitreoretinal traction increased by 7.90 dynes for each 100 mm Hg increase in vacuum (p<0.05). The traction forces decreased by 2.51 dynes for each 500 cuts per minute increased (p<0.05) and the traction force increased by 2.17 dynes at 3 mm compared with 5 mm (p<0.05). CONCLUSION: The traction was directly proportional to the aspiration vacuum and inversely proportional to the cut rate. The cutter traction force increased with proximity to the retina.
Authors: Paul J Missel; Yongting Ma; Brian W McDonell; Danial Shahmirzadi; Dina Joy K Abulon; Ramesh Sarangapani Journal: Transl Vis Sci Technol Date: 2020-07-30 Impact factor: 3.283
Authors: Paulo E Stanga; Jon I Williams; Sherif A Shaarawy; Amar Agarwal; Anusha Venkataraman; Dhivya A Kumar; Timothy T You; Richard S Hope Journal: Retina Date: 2020-01 Impact factor: 3.975