Shape memory polymer intraocular lenses
View Patent ↗A shape memory polymer (SMP) intraocular lens may have a refractive index above 1.45, a Tg between 10° C. and 60° C., inclusive, de minimis or an absence of glistening, and substantially 100% transmissivity of light in the visible spectrum. The intraocular lens is then rolled at a temperature above Tg of the SMP material. The intraocular device is radially compressed within a die to a diameter of less than or equal to 1.8 mm while maintaining the temperature above Tg. The compressed intraocular lens device may be inserted through an incision less than 2 mm wide in a cornea or sclera or other anatomical structure. The lens can be inserted into the capsular bag, the ciliary sulcus, or other cavity through the incision. The SMP can substantially achieve refractive index values of greater than or equal to 1.45.
1. A shape memory polymer (SMP) intraocular lens comprising:
a refractive index above 1.45;
a Tg between 10° C. and 60° C., inclusive;
de minimis or an absence of glistening; and
substantially 100% transmissivity of light in the visible spectrum,
wherein the SMP intraocular lens comprises a tert-butyl acrylate (tBA) monomer, and a poly(ethylene glycol) dimethacrylate crosslinking monomer with a molecular weight substantially between 500 and 2000, inclusive.
2. The SMP intraocular lens of claim 1 , wherein the SMP intraocular lens is formed from a combination of 50 weight percent tert-butyl acrylate monomers, 28 weight percent isobutyl acrylate monomers, and 22 weight percent PEGDMA 1000 crosslinking monomers.
3. The SMP intraocular lens of claim 1 , wherein the SMP intraocular lens is formed from a combination of 22 weight percent tert-butyl acrylate monomers and 78 weight percent PEGDMA 1000 crosslinking monomers.
4. The SMP intraocular lens of claim 1 , wherein the SMP intraocular lens is formed from a combination of 65 weight percent tert-butyl acrylate monomers, 13 weight percent butyl acrylate monomers, and 22 weight percent PEGDMA 1000 crosslinking monomers.
5. The SMP intraocular lens of claim 1 , wherein the intraocular lens exhibits greater than 98 percent shape recovery from a deformed configuration upon reaction to an external stimulus.
6. The SMP intraocular lens of claim 5 , wherein the external stimulus is heat above Tg.
7. The SMP intraocular lens of claim 5 , wherein the external stimulus is ultraviolet radiation.
8. The SMP intraocular lens of claim 5 , wherein the reaction to the external stimulus is delayed for up to 600 seconds.
9. The SMP intraocular lens of claim 5 , wherein the reaction initiates within 3 to 25 seconds.
10. The SMP intraocular lens of claim 5 , wherein a shape memory polymer material forming the SMP intraocular lens comprises a color additive.