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Punctum and canalicular anatomy for hydrogel-based intracanalicular insert technology
Sydney L Tyson1, Patrick Campbell2, James Biggins2
1Eye Associates & SurgiCenter of Vineland, Vineland, NJ 08361, USA.
Therapeutic Delivery
|March 17, 2020
Summary
A new hydrogel dexamethasone insert for intracanalicular administration was developed to manage postoperative ocular inflammation after cataract surgery. Anatomical study revealed vertical canalicular width exceeds punctal opening, aiding insert retention.
Area of Science:
- Ophthalmology
- Ocular Drug Delivery
- Anatomy
Background:
- Postoperative ocular inflammation and pain are common complications following cataract surgery.
- Topical corticosteroid administration faces compliance challenges.
- Intracanalicular drug delivery offers a potential solution for sustained ocular drug release.
Purpose of the Study:
- To investigate the anatomical dimensions of the human punctum and canaliculus.
- To understand how anatomical features and hydrogel properties facilitate the retention of intracanalicular inserts.
- To inform the optimal placement and design of a novel hydrogel-based dexamethasone insert.
Main Methods:
- Dissection of human cadavers (n=5) to measure the dimensions of the punctum and canaliculus.
- Assessment of anatomical parameters relevant to intracanalicular insert placement and retention.
Main Results:
- The mean punctal diameter was measured at 0.5 ± 0 mm.
- The mean vertical canalicular length was 2.4 ± 0.5 mm.
- The mean vertical canalicular width was 1.6 ± 0.5 mm, which was larger than the punctal opening.
Conclusions:
- The vertical canalicular width being larger than the punctal opening is a critical factor for retaining intracanalicular inserts.
- Understanding these anatomical metrics is essential for the successful development and administration of intracanalicular drug delivery systems.
- This study provides foundational anatomical data for the design of hydrogel-based dexamethasone inserts for sustained postoperative ocular inflammation management.
