25-gauge cannula system with microvitreoretinal blade trocar.
OBJECTIVE
To report a 25-gauge trocar-cannula that enhances wound closure and reduces the incidence of postoperative hypotony.


METHODS
Development of surgical instruments.


METHODS
A 25-gauge cannula with a microvitreoretinal (MVR) blade trocar was constructed. The resistance of inserting this trocar cannula was compared with that of the conventional 25-gauge trocar cannula (Alcon Laboratories; Fort Worth, Texas, USA). Vitreous surgery was performed on 55 eyes with the trocar cannula with an oblique sclerotomy incision, and the results were compared with those from 68 eyes that underwent surgery with the conventional trocar cannula.


RESULTS
The resistance of inserting the trocar cannula was less than that with the conventional trocar cannula. A temporary hypotony (intraocular pressure [IOP] <6 mm Hg) was found in one eye (2%) with the trocar cannula and in 12 eyes (18%) with the conventional trocar cannula (P = .006, Fisher exact probability test).


CONCLUSIONS
The trocar cannula with a MVR blade was effective in postoperative wound closure and prevention of postoperative hypotony.
Department of Ophthalmology, Keio University School of Medicine, Keio University School of Medicine, Tokyo, Japan. inoshin@sc.itc.keio.ac.jp
Makoto
M
Inoue
Kei
K
Shinoda
Hajime
H
Shinoda
Kotaro
K
Suzuki
Ryosuke
R
Kawamura
Susumu
S
Ishida
D002404:Catheterization / Q000295:instrumentation*; D004867:Equipment Design; D005500:Follow-Up Studies; D006801:Humans; D011183:Postoperative Complications; D012164:Retinal Diseases / Q000601:surgery*; D012590:Sclera / Q000601:surgery; D014821:Vitrectomy / Q000295:instrumentation*