Hydrogels and methods for their production

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 8/30 (2006.01) A61L 27/16 (2006.01) A61L 27/52 (2006.01) C08F 261/00 (2006.01) C08F 261/04 (2006.01) C08F 283/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2405314

The present invention relates to new hydrogels with improved mechanical properties and methods of their preparation. The hydrogels are formed from hydrophilic polymers having function hydroxyl groups and have low elasticity modulus typically less than about 10 kPa, a tensile strength above 1 MPa, an elongation above 50 % which makes suitable as medical implants, in particular intraocular lenses. The hydrogels are prepared by a crosslinking method with a comparatively low concentration of hydrophilic polymer of a sufficiently high molecular weight dissolved in a good solvent.

La présente invention concerne de nouveaux hydrogels dotés de propriétés mécaniques améliorées ainsi que des procédés de préparation associés. Les hydrogels sont formés à partir de polymères hydrophiles présentant des groupes fonctionnels hydroxyl et de faible module d'élasticité, généralement inférieur à environ 10 kPa, une résistance à la traction supérieure à 1 MPa, un allongement supérieure à 50 %, les rendant appropriés pour des implants médicaux, particulièrement des lentilles intra-occulaires. Les hydrogels sont préparés au moyen d'un procédé de réticulation mettant en oeuvre une concentration relativement faible en polymères hydrophiles d'un poids moléculaire suffisamment élevé dissous dans un solvant offrant des propriétés satisfaisantes.

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