Soft silicone medical devices
The invention is related to a method for producing silicone medical devices, in particular, silicone contact lenses, having consistent mechanical properties in a cost-effective manner. The invention is also related to a silicone medical device, especially a soft silicone contact lens.
1. A medical device, comprising a crosslinked silicone material, wherein the crosslinked silicone material comprises: (a) from about 70% to about 97% by weight of repeating units of a first polydiorganosiloxane having at least two (meth)acryloylamido groups; (b) from 1.0% to 20.0% by weight of repeating units of a second polydiorganosiloxane having at least two thiol groups; and (c) from about 2% to about 15% by weight of repeating units of a third polydiorganosiloxane having at least two (meth)acryloyloxy groups, wherein each of the first and second polydiorganosiloxanes has an averaged molecular weight of at least about 2000 Daltons, wherein the medical device has an elastic modulus of about 1.2 MPa or less and an elongation at break of about 200% or larger.
2. The medical device of claim 1 , wherein the first polydiorganosiloxane comprises at least two acryloylamido groups.
3. The medical device of claim 1 , wherein the first polydiorganosiloxane comprises at least two methacryloylamido groups.
4. The medical device of claim 1 , wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydiorganosiloxane.
5. The medical device of claim 1 , wherein the medical device is a silicone intraocular lens or a silicone contact lens.
6. The medical device of claim 2 , wherein the medical device is a silicone contact lens, wherein the first and second polysiloxanes independent of each other have an average molecular weight of from about 6000 to about 200000 Daltons, wherein the third polydiorganosiloxanes have an average molecular weight of from about 4000 to about 150000 Daltons.
7. The medical device of claim 3 , wherein the medical device is a silicone contact lens, wherein the first and second polysiloxanes independent of each other have an average molecular weight of from about 6000 to about 200000 Daltons, wherein the third polydiorganosiloxanes have an average molecular weight of from about 4000 to about 150000 Daltons.
8. The medical device of claim 4 , wherein the medical device is a silicone contact lens, wherein the first and second polysiloxanes independent of each other have an average molecular weight of from about 6000 to about 200000 Daltons, wherein the third polydiorganosiloxanes have an average molecular weight of from about 4000 to about 150000 Daltons.
9. The medical device of claim 2 , wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydiorganosiloxane.
10. The medical device of claim 9 , wherein the medical device is a silicone intraocular lens or a silicone contact lens.
11. The medical device of claim 10 , wherein the first and second polysiloxanes independent of each other have an average molecular weight of from about 6000 to about 200000 Daltons, wherein the third polydiorganosiloxanes have an average molecular weight of from about 4000 to about 150000 Daltons.
12. The medical device of claim 3 , wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydiorganosiloxane.
13. The medical device of claim 12 , wherein the medical device is a silicone intraocular lens or a silicone contact lens.
14. The medical device of claim 13 , wherein the first and second polysiloxanes independent of each other have an average molecular weight of from about 6000 to about 200000 Daltons, wherein the third polydiorganosiloxanes have an average molecular weight of from about 4000 to about 150000 Daltons.
15. The medical device of claim 4 , wherein the first, second, and third polydiorganosiloxanes independent of one another are a linear polydiorganosiloxane.
16. The medical device of claim 15 , wherein the medical device is a silicone intraocular lens or a silicone contact lens.
17. The medical device of claim 16 , wherein the first and second polysiloxanes independent of each other have an average molecular weight of from about 6000 to about 200000 Daltons, wherein the third polydiorganosiloxanes have an average molecular weight of from about 4000 to about 150000 Daltons.