Related Experiment Video
Updated: Aug 17, 2026
Retinal Pigment Epithelium Transplantation in a Non-human Primate Model for Degenerative Retinal Diseases
Published on: June 14, 2021
A new non-trocar system for 25-gauge transconjunctival pars plana vitrectomy
Mamoru Tei1, Takasumi Shimamoto, Toru Yasuhara
1Department of Ophthalmology, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyou-ku, Kyoto 602-0841, Japan. mtei@ophth.kpu-m.ac.jp
Purpose:
To introduce a new non-trocar system for 25-gauge transconjunctival pars plana vitrectomy (PPV).
Design:
Study of a new surgical instrument.
Methods:
This new non-trocar system for 25-gauge transconjunctival PPV consists of a contact lens ring featuring four projections containing 1.0-mm diameter holes located 3.0 mm from the ring edge, a wedge-shaped 25-gauge infusion cannula, and two plugs.
Results:
The ring is fixed with 7-0 silk sutures at the 3- and 9-o'clock positions on the limbus. Using the 25-gauge needle, three conjunctival and scleral incisions (n = 3) are made at the projection holes located inferotemporally, superonasally, and superotemporally. No intra- or postoperative complications were encountered in 14 patients treated by this non-trocar 25-gauge transconjunctival PPV.
Conclusion:
Using the system introduced here, 25-gauge transconjunctival PPV can be performed without suturing sclerotomies and without intra- or postoperative complications.
