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Implantation Protocol of the Foldable Capsular Vitreous Body for Complex Vitreoretinal Surgery

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Injectability of silicone oil-based tamponade agents.

R L Williams¹, M J Day, M J Garvey

¹Department of Eye and Vision Science, Institute of Ageing and Chronic Disease, Liverpool, UK. rlw@liverpool.ac.uk

The British Journal of Ophthalmology

|November 13, 2010

Summary

This summary is machine-generated.

High viscosity silicone oils are difficult to inject. Blending these oils with high molecular weight additives improves injectability while maintaining resistance to emulsification, offering a practical solution for ophthalmic surgery.

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Area of Science:

Ophthalmology
Biomaterials Science
Rheology

Background:

High viscosity silicone oils are crucial tamponade agents in ophthalmic surgery.
Their high viscosity, while enhancing emulsification resistance, poses significant injection challenges.
Increasing extensional viscosity is a potential strategy to mitigate emulsification without compromising injectability.

Purpose of the Study:

To investigate the injection characteristics of silicone oils with modified extensional viscosity.
To determine if silicone oil blends can achieve improved injectability compared to single-grade oils.

Main Methods:

Evaluated shear viscosity and injection time for various silicone oils (Siluron 1000, 2000, 5000, SiliconMate) and blends (Blend A, Blend B).
Measured the time required to inject a standard volume (9 ml) of each sample.
Characterized silicone oil blends with varying ratios of standard oils and high molecular weight polydimethylsiloxane (PDMS).

Main Results:

Shear viscosities of Siluron 1000, 2000, and 5000 were within expected ranges.
Blend A (Siluron 1000/5000) exhibited a shear viscosity of 2283 mPa·s, and Blend B (Siluron 1000/PDMS) showed 4710 mPa·s.
Lower viscosity oils (Siluron 1000, SiliconMate) had shorter injection times, but Blend B demonstrated easier injection than Siluron 5000, and Blend A was easier to inject than Siluron 2000.

Conclusions:

Silicone oil blends incorporating small amounts of high molecular weight additives exhibit superior injectability.
These blends offer a promising alternative to single-grade silicone oils, balancing emulsification resistance with ease of use.
The findings suggest a new approach to formulating ophthalmic tamponade agents.