MicroMed

PDMS is used for long-term (at least 30 days) ocular tamponade after vitrectomy surgery.
PDMS undergoes scrupulous biocompatibility testing before packaging, and the chemical
analysis performed allows us to guarantee high purity of the silicone oil due to the presence of
a very low percentage of volatile chains (0.1%).
This product line was approved for marketing in 1999 and is a Class IIB medical device.
Silicones have been used in the medical field for about fifty years. No other material is suffi-
ciently biocompatible, reliable, flexible and easily sterilized as silicone.
Liquid PDMS is indicated and recommended in all world pharmacopoeias for use as a medical
device. It is odorless, tasteless, does not support bacterial growth and does not react with
other materials, but most importantly, it has high compatibility with human tissues and body
fluids.
Several product categories belong to the PDMS family, which differ from each other based on
the primary packaging and viscosity of the silicone oil mixture.
Micromed PDMS is marketed in different viscosity variants:
PDMS 1000 characterized by the presence of chain lengths with a standard deviation less
than 0.02% and a typical viscosity of 1000 centiStokes; its braking index is conventionally set
at 1.
The PDMS 1300 centiStokes with the same characteristics but with a 4% higher braking
index.
PDMS 2000 has a braking index greater than 15 percent and is indicated in cases where
emulsification with protein fluids in the eye is likely to occur independent of surgery.
The latest variant is the PDMS 5000 which has a braking index greater than 70 percent and
is indicated in cases where retinal manipulation has been significant, such as in the case of
strong overhanging treatments on major cerclages and for more than 40 percent of the retinal
surface, or in the case of major retinotomies in the presence of cerclage or large retractions