Prosthetic Heart Valve Leaflet Attachment for Stress and Abrasion Relief

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Solution Overview

Problem

Existing prosthetic heart valves face issues with leaflet attachment methods that result in stress concentrations and abrasion due to changes in frame diameter and systole-diastole cycles, leading to potential suture loop failure.

Innovation Solution

The attachment of scalloped edges of valvular leaflets to struts via suture loops oriented perpendicular to the scallop stitch line, allowing for slidable movement along strut segments, and the use of flexible or rigid scallop line elements to manage stress and prevent abrasion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If leaflets are attached to frame struts via suture loops in conventional configurations, then the leaflets are securely anchored to the frame, but stress concentrations and abrasion occur during frame diameter changes and systole-diastole cycles

Engineering Contradiction:

Improveattachment strengthVSAvoidsuture loop durability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

A cloth strip is introduced as an intermediary element between the leaflet and the frame strut. The suture loop attaches to the cloth strip rather than directly to the strut, allowing relative movement and reducing stress concentrations. The cloth strip acts as a flexible mediator that absorbs mechanical stress and prevents direct abrasion between the suture loop and the rigid strut during frame expansion and contraction cycles

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The attachment system is designed to be dynamic rather than rigid. The suture loop is configured to slide along the cloth strip during frame diameter changes and systole-diastole cycles, allowing the attachment point to move and adapt to changing geometric conditions. This dynamic configuration prevents stress buildup and abrasion that would occur in a fixed rigid attachment

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the frame diameter changes during crimping procedures, then the prosthetic valve can be deployed and compressed for implantation, but the leaflets experience stretching and compression leading to high stress concentrations

Engineering Contradiction:

Improveframe expandabilityVSAvoidstress concentration on leaflets

Core Design Contradiction:

Adaptability or versatilityVSStress or pressure

Solution Approach 1:

The cloth strip serves as a stress-absorbing intermediary between the leaflet and the frame. During frame expansion and compression, the cloth strip allows the leaflet attachment point to move independently, reducing the transmission of mechanical stress to the leaflet tissue. This mediator layer protects the leaflet from the full extent of frame diameter changes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The attachment system accommodates parameter changes in the frame geometry by allowing the suture loop to slide along the cloth strip. As the frame diameter changes during crimping and deployment, the attachment configuration adapts by changing the position of the suture loop along the cloth strip, maintaining secure attachment while reducing stress concentrations

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If suture loops are used to attach leaflets to struts, then the assembly process is simplified, but abrasion occurs during systole and diastole cycles at the attachment regions

Engineering Contradiction:

Improveassembly simplicityVSAvoidabrasion at attachment regions

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The cloth strip is positioned between the suture loop and the frame strut to prevent direct contact and abrasion. During systole and diastole cycles, the cloth strip absorbs the friction and wear that would otherwise occur at the suture loop-strut interface, significantly extending the durability of the attachment system while maintaining assembly simplicity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The cloth strip acts as a sacrificial, replaceable component that protects the more critical suture loop and leaflet structures. The cloth strip can be designed as a relatively simple, less critical component that absorbs wear and tear, protecting the essential functional elements from abrasion during repeated cardiac cycles

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS12575927B2Prosthetic heart valves

Publication Date: 2026.03.17 EDWARDS LIFESCIENCES CORP

AI summary

Disclosed are techniques for construction of prosthetic heart valves, particularly techniques for attachment of scalloped edges of valvular leaflets to struts of mechanical frames using sutures and/or other materials as intermediate coupling members. In some embodiments, the scalloped edges of the leaflets are coupled to the segments of the struts of the frame via suture loops that are oriented transverse to the scalloped edges of the leaflets. In some embodiments, central portions of scallop line segments are attached to the scalloped edges of the leaflets and are not attached to the frame. In some embodiments, strut segments are tapered to limit translation of suture loops. In some embodiments, a cloth strip couples the scalloped edges of the leaflets to frame struts. In some embodiments, the scalloped edge is attached to adjacent segments of intersecting struts via sliding suture loops, where the adjacent segments join at a common pivot joint.