New COC-based corneal lens storage system by TOPAS for long-term preservation

According to Allotex, its approach uses precisely shaped human corneal tissue to preserve the eye's natural structure through a tissue-addition method the company describes as biocompatible and reversible.

Allotex's lead product, the TransForm™ Allogenic Corneal Inlay, is a thin, laser-shaped disc of sterile corneal tissue designed to be implanted beneath a femtolaser flap, where it integrates with the patient's cornea. By adding tissue rather than removing or permanently altering it, the company positions the inlay as a minimally invasive alternative to more disruptive procedures.

Allotex notes that this approach is suited to specific patient profiles – including those at earlier stages of lens dysfunction with otherwise healthy ocular anatomy – who are seeking functional improvement while remaining cautious about procedures that permanently alter tissue or involve intraocular intervention.

A key element of Allotex's technology platform is its corneal lens storage and delivery system, which incorporates precision-molded components manufactured from TOPAS® COC. Allotex reports that it evaluated multiple polymer options for this storage system before selecting TOPAS® COC. The biological corneal inlays must be maintained in a moist environment for up to 12 months, which requires a material able to reliably preserve internal chamber conditions over an extended shelf life.

Key characteristics

According to Allotex, TOPAS® COC was selected for the following characteristics:

• Material purity, supporting biologic compatibility

• Chemical resistance, supporting stability with storage media

• Moisture barrier properties that minimize solvent loss over time

• Optical transparency, compatible with E-beam sterilization processes

The company reports that many competing polymers permit gradual moisture transmission, which can lead to solvent loss, drying, and compromised tissue viability. Allotex states that, by contrast, the low moisture permeability of TOPAS® COC helps maintain chamber humidity and preserve the structural and functional integrity of the corneal allograft throughout long-term storage.

Engineers can review cyclic olefin copolymer and other specialty plastics grades directly in the Master Catalog of Plastics.

"This collaboration reflects a shared commitment to advancing a more biologically aligned approach," said Evan Sherr, COO, Allotex. "By combining our tissue-based platform with advanced material capabilities, we are building a system that supports both the integrity of the implant and the needs of the clinicians who use it."

"At Daicel High Performance Polymers, we see the greatest impact when material science helps solve complex challenges at the system level," said Raghavendra "Raj" Maddikeri, Business Development manager – Healthcare, Daicel High Performance Polymers. "Our collaboration with Allotex demonstrates how the right material can help preserve sensitive biologic components while supporting performance, quality, and scalability."

Clinical development and regulatory status

Allotex operates in both the United States and Europe. According to the company, its biologic corneal implant technologies are approved for use in the European Union and are currently in clinical development in the U.S. Allotex has submitted an FDA Investigational Device Exemption (IDE) application to support clinical trials of its corneal implant platforms.

Presbyopia, a condition that gradually reduces the eye's ability to focus on nearby objects, affects more than 1.8 billion people worldwide, according to the company, with prevalence expected to increase as populations age. Allotex positions its platform as addressing this need through a reversible, tissue-preserving solution enabled by biologic materials and precision-engineered delivery systems.

You can review TOPAS® COC grades and compare specifications in the Master Catalog of Plastics.

Image credits: TOPAS