Polymeric heart valve
    6.
    发明授权

    公开(公告)号:US10772722B2

    公开(公告)日:2020-09-15

    申请号:US15492227

    申请日:2017-04-20

    IPC分类号: A61F2/24

    摘要: A polymeric valve which may include a heart valve, and also may include a trileaflet heart valve includes a stent having a base and a plurality of outwardly extending posts from the base and equidistant from each other. A plurality of leaflets each connected to a corresponding one of the posts at one end, and each of the leaflets connected to the base. Each of the leaflets having an operative end opposite the end connected to the post, and the operative ends of the leaflets being biased in a closed position such that the operative ends abut each other. The operative ends are configured to rhythmically open and close in relation to each other, and the leaflets include multiple cross sectional thicknesses at different portions of the leaflets.

    Solar concentrator for a tower-mounted central receiver

    公开(公告)号:US10551089B2

    公开(公告)日:2020-02-04

    申请号:US15748792

    申请日:2016-08-03

    摘要: A solar concentrator may have a horizontal circular track on the ground, a tower centered on a vertical axis of the track, and a rotatable structure around the track having an upper, concave mounting surface approximating the shape of part of a sphere centered on the top of the tower. Articulated concave mirrors are attached to the rotatable structure, and the mirrors have a focal length approximately equal to the radius of a sphere portion formed by the concave mounting surface. Sunlight is focused at a receiver mounted atop the tower, and the receiver may convert sunlight into thermal or electrical energy. As the position of the Sun changes, sunlight is maintained on the receiver by turning the rotatable structure toward the Sun, turning the receiver about said vertical axis to face the mirrors, and articulating the mirrors toward the receiver in response to the changing elevation of the Sun.