Prosthetic Valve Leaflets with Mechanical Projections

The patent replaces chemical bonding methods (sewing and adhesive/thermal bonding) with a purely mechanical attachment system. The leaflet frame projections mechanically engage with slots in the leaflet attachment region, creating a physical interlocking mechanism that does not rely on chemical bonds vulnerable to degradation in aqueous environments. This mechanical substitution eliminates the reliability issues associated with sewing and adhesive bonding over the long term.

The patent introduces an intermediary mechanical connection system consisting of projections and slots. Instead of directly bonding the leaflet to the frame using vulnerable chemical methods, the projections extend through the slots to create a mediated mechanical connection. This intermediary structure distributes stresses and provides a reliable attachment that maintains integrity in aqueous environments throughout the prosthetic valve's service life.

The patent applies local quality by concentrating structural reinforcement at specific locations rather than uniformly increasing leaflet thickness. The leaflet frame projections are strategically positioned at the attachment regions and commissure areas where stress concentration occurs. This localized mechanical support provides enhanced tear resistance at critical points without increasing the overall leaflet thickness, thereby maintaining the leaflet's flexibility and bending characteristics for optimal valve performance.

The patent implements preliminary action by providing pre-configured mechanical support structures (projections and slots) that are built into the leaflet frame before the leaflet is subjected to operational stresses. These projections are designed with specific geometries and positioning to preemptively counteract stress concentrations and potential tear points. This preliminary structural reinforcement enables the use of thinner, more flexible leaflet material while maintaining adequate tear resistance through the engineered mechanical support system.

The patent applies segmentation by dividing the load-bearing function into multiple discrete projection elements rather than relying on a single tall commissure post. The leaflet frame includes multiple projections distributed along the attachment region, with each projection engaging through its own slot. This segmentation distributes the mechanical load across multiple contact points and structural elements, achieving effective load distribution without requiring increased overall commissure post height, thereby maintaining a compact valve profile suitable for transcatheter applications.

The patent transitions from a vertical load distribution approach (taller commissure posts) to a distributed multi-point approach. Instead of extending the commissure post height in the vertical dimension, the patent distributes load-bearing projections along the attachment region in a different spatial arrangement. The projections extend through slots at various positions, creating a distributed load path that achieves load distribution effectiveness without increasing the vertical profile of the prosthetic valve, thus avoiding adverse interactions with native anatomy.