Related Experiment Video
Updated: Jun 19, 2026
11:06
Subretinal Implantation of RPE on a Carrier in Minipigs: Guidelines for Preoperative Preparations, Surgical Techniques, and Postoperative Care
Published on: November 11, 2022
Twenty-three gauge cannula system with microvitreoretinal blade trocar
Makoto Inoue1, Kei Shinoda, Akito Hirakata
1Kyorin Eye Center, Kyorin University School of Medicine, 6-20-2 Shinkawa, Mitaka, Tokyo 181-8611, Japan. inoue@eye-center.org
The British Journal of Ophthalmology
|October 16, 2009
Summary
A new microvitreoretinal (MVR) blade trocar-cannula significantly improves wound closure after vitrectomy. This MVR trocar-cannula also reduces the incidence of postoperative hypotony, enhancing patient outcomes.
Area of Science:
- Ophthalmology
- Surgical Innovation
- Retinal Surgery
Background:
- Vitrectomy is a common surgical procedure for various retinal conditions.
- Postoperative hypotony and suboptimal wound closure are potential complications following vitrectomy.
- Standard trocar-cannula systems may present challenges in achieving secure sclerotomy closure.
Purpose of the Study:
- To evaluate the efficacy of a 23-gauge cannula with a microvitreoretinal (MVR) blade trocar.
- To compare wound closure and the incidence of postoperative hypotony using the MVR trocar-cannula versus conventional trocar-cannulas.
- To assess the impact of the MVR trocar-cannula on surgical outcomes in vitrectomy.
Main Methods:
- Comparative study involving porcine scleral insertion resistance testing.
- Clinical trial with 78 eyes undergoing vitrectomy (48 with MVR trocar-cannula, 30 with conventional).
- Postoperative assessment of intraocular pressure and sclerotomy closure via optical coherence tomography.
Main Results:
- Lower insertion resistance for the MVR trocar-cannula compared to conventional.
- Significantly reduced incidence of transient postoperative hypotony (4% vs. 23%) with MVR trocar-cannula (p=0.023).
- Improved sclerotomy wound closure rates observed with MVR trocar-cannula on postoperative days 1, 3, and 7 (p=0.028, p=0.003, p=0.008).
Conclusions:
- The 23-gauge MVR trocar-cannula offers superior wound closure after vitrectomy.
- This innovative trocar-cannula effectively minimizes the occurrence of postoperative hypotony.
- The MVR trocar-cannula represents a significant advancement in vitrectomy instrumentation.
