Expansion and locking mechanism for mechanically expandable valves

An assembly, comprising:

• a prosthetic heart valve comprising
• a frame movable between a radially compressed and a radially expanded configuration, the frame comprising an inflow end portion and an outflow end portion, the frame comprising a first strut and a second strut comprising a first flange and a second flange respectively,
• at least one expansion and locking mechanism comprising a first member coupled to the frame at a first location, a second member coupled to the frame at a second location spaced apart from the first location, the second member extending at least partially into the first member, and a third member comprising an engagement portion;
• a delivery apparatus comprising
• a handle,
• a first actuation member extending from the handle and releasably coupled to the first member, the first actuation member configured to apply a distally directed force to the first member,
• a second actuation member extending from the handle and releasably coupled to the second member, the second actuation member configured to apply a proximally directed force to the second member,
• a third actuation member extending from the handle and releasably coupled to the third member,
• wherein the prosthetic heart valve is radially expandable from the radially compressed configuration to the radially expanded configuration upon application of at least one of the distally directed force and the proximally directed force to the prosthetic heart valve via the first and second actuation members, respectively;
• and
• wherein when the prosthetic heart valve is in the radially expanded configuration the engagement portion of the third member selectively engages the first and second flanges to prevent compression of the frame.