Devices and methods for delivery and deployment of balloon expandable transcatheter valves

A balloon catheter for deploying a prosthetic heart valve through balloon inflation, comprising:

• an inner shaft defining a guidewire lumen;
• an outer shaft surrounding the inner shaft defining an inflation lumen between the outer shaft and the inner shaft;
• a distal portion at a distal end of the outer shaft;
• a balloon disposed at the distal portion such that fluid delivered to the balloon via the inflation lumen causes the balloon to inflate;
• a proximal multipart retention bumper secured to the inner shaft inside the balloon and configurable in an interlocked configuration and a non-interlocked configuration, the proximal multipart retention bumper including a proximal inner wedge and a proximal outer bumper;
• and
• a distal multipart retention bumper secured to the inner shaft inside the balloon and configurable in an interlocked configuration and a non-interlocked configuration, the distal multipart retention bumper including a distal inner wedge and a distal outer bumper;
• wherein the proximal inner wedge and the proximal outer bumper are substantially non-compressible during steps of manufacture, assembly, and use of the balloon catheter, and
• wherein the distal inner wedge and the distal outer bumper are substantially non-compressible during steps of manufacture, assembly, and use of the balloon catheter.