An apparatus comprising: a stent that includes (a)(i) first, second, third, and fourth struts (101, 102, 103, 104), and (a)(ii) first, second, third, fourth, and fifth windows (111, 112, 113, 114, 115); a valve included within the stent; an open-cell polyurethane thermoset shape memory polymer foam, the SMP foam being configured to expand from a compressed secondary state to an expanded primary state in response to stimulus; and an outer conduit that includes the stent; wherein (b)(i) the first and third windows (111, 113) share the first strut and are both immediately adjacent the first strut, (b)(ii) the second and third windows (112, 113) share the second strut and are both immediately adjacent the second strut, (b)(iii) the fourth and third windows (114, 113) share the third strut and are both immediately adjacent the third strut, and (b)(iv) the fifth and third windows (115, 113) share the fourth strut and are both immediately adjacent the fourth strut; wherein the SMP foam substantially covers at least 80% of a first face of the third window, the third window having the first face and a second face that oppose one another; wherein (c)(i) the first and second struts (101, 102) fixedly couple to the SMP foam, and (c)(ii) the third and fourth struts (103, 104) do not fixedly couple to the SMP foam; wherein in a first orientation (d)(i) the stent has a first maximum stent outer diameter, (d)(ii) the third window has a first window length measured parallel to a long axis of the stent, (d)(iii) the third window has a first window width measured orthogonal to the long axis of the stent and parallel to a short axis of the stent, and (d)(iv) the SMP foam is in the compressed secondary state; wherein in a second orientation (e)(i) the stent has a second maximum stent outer diameter that is greater than the first maximum stent outer diameter; (e)(ii) the third window has a second window length that is less than the first window length, (e)(iii) the third window has a second window width that is greater than the first window width, and (e)(iv) the SMP foam is in the expanded primary state; wherein in response to the first and second struts fixedly coupling to the SMP foam, and the third and fourth struts (103, 104) not fixedly coupling to the SMP foam, the SMP foam is configured to move dependent upon the first and second struts (101, 102) and independent of the third and fourth struts (103, 104) when the apparatus transitions from the first orientation to the second orientation. a stent that includes (a)(i) first, second, third, and fourth struts (101, 102, 103, 104), and (a)(ii) first, second, third, fourth, and fifth windows (111, 112, 113, 114, 115); a valve included within the stent; an open-cell polyurethane thermoset shape memory polymer foam, the SMP foam being configured to expand from a compressed secondary state to an expanded primary state in response to stimulus; and an outer conduit that includes the stent; wherein (b)(i) the first and third windows (111, 113) share the first strut and are both immediately adjacent the first strut, (b)(ii) the second and third windows (112, 113) share the second strut and are both immediately adjacent the second strut, (b)(iii) the fourth and third windows (114, 113) share the third strut and are both immediately adjacent the third strut, and (b)(iv) the fifth and third windows (115, 113) share the fourth strut and are both immediately adjacent the fourth strut; wherein the SMP foam substantially covers at least 80% of a first face of the third window, the third window having the first face and a second face that oppose one another; wherein (c)(i) the first and second struts (101, 102) fixedly couple to the SMP foam, and (c)(ii) the third and fourth struts (103, 104) do not fixedly couple to the SMP foam; wherein in a first orientation (d)(i) the stent has a first maximum stent outer diameter, (d)(ii) the third window has a first window length measured parallel to a long axis of the stent, (d)(iii) the third window has a first window width measured orthogonal to the long axis of the stent and parallel to a short axis of the stent, and (d)(iv) the SMP foam is in the compressed secondary state; wherein in a second orientation (e)(i) the stent has a second maximum stent outer diameter that is greater than the first maximum stent outer diameter; (e)(ii) the third window has a second window length that is less than the first window length, (e)(iii) the third window has a second window width that is greater than the first window width, and (e)(iv) the SMP foam is in the expanded primary state; wherein in response to the first and second struts fixedly coupling to the SMP foam, and the third and fourth struts (103, 104) not fixedly coupling to the SMP foam, the SMP foam is configured to move dependent upon the first and second struts (101, 102) and independent of the third and fourth struts (103, 104) when the apparatus transitions from the first orientation to the second orientation.