Stent-valves for valve replacement and associated methods and systems for surgery

A replacement valve for use within a human body comprising:

• a valve component;
• and
• a stent component comprising:
• a first section comprising an annular groove, and
• a second section for housing the valve component,
• wherein:
• the stent component and the valve component are configured to form a stent-valve, the stent-valve is configured:
• in a collapsed configuration for delivery at an implantation site,
• a self-expanding expanded configuration after delivery to the implantation site;
• the annular groove is defined by an annular indentation of the stent component which correspondingly presents an indented interior surface of the stent component,
• the annular groove including a diameter that is slightly larger than a diameter of the implantation site such that the stent-valve is secured in place by a friction fitting;
• the valve component is housed by the second section and extends down to the annular groove of the first section,
• the valve component is axially taller than the annular groove.