Barbless Heart Valve Stent Radial Support Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prosthetic heart valves with stents that pierce the valve annulus during implantation cause injury, which worsens with dynamic heartbeats, and existing solutions fail to adequately address this issue.
Innovation Solution
A stent design with an inner and outer frame forming a receiving space that radially supports the valve annulus, allowing for implantation without piercing, using an outer skirt section and inner skirt section to prevent movement and reduce injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barbs on the stent pierce into the valve annulus for positioning, then the prosthetic heart valve can be securely positioned, but injury to the valve annulus is caused and progressively worsened with dynamic heartbeats
Solution Approach 1:
The invention removes the harmful barbs from the stent structure entirely. Instead of using barbs that pierce the valve annulus, the stent uses a barbless design with radial support features that achieve positioning without penetrating or damaging the valve annulus tissue, thereby eliminating the source of injury while maintaining positioning stability
Solution Approach 2:
The stent incorporates localized radial support features at specific positions along its length that provide targeted anchoring and positioning functionality. These localized features achieve secure positioning without requiring circumferential barbs that would cause widespread injury to the valve annulus, concentrating the interaction points to minimize overall tissue damage
2Ease of operation
If the stent is designed to be implanted through minimally invasive procedure, then patient trauma is reduced, but the complexity of achieving secure positioning without barbs increases
Solution Approach 1:
The stent is designed with shape memory properties that allow it to transition from a compressed delivery state to an expanded functional state. This dynamic transformation enables the stent to be delivered through minimally invasive catheter-based procedures while automatically achieving its final positioned configuration with radial support features that secure it without barbs
Solution Approach 2:
The stent is designed to be nested within a delivery catheter system during minimally invasive implantation. The compressed stent fits within the catheter lumen, and upon deployment, the stent expands outward to engage the valve annulus with its radial support features, achieving secure positioning through the nested delivery mechanism without requiring complex external fixation structures
Data Source
AI summary
A heart valve prosthesis stent comprises an inner stent and an outer stent. The outer stent comprises an outer body section and an outer skirt section which extends from the outer body section and is located on the radial outer side of the outer body section. The inner stent comprises an inner body section at least partially located in the outer stent and an inner skirt section protruding out of the radial outer side of the inner body section from an inflow end of the inner body section. The inner skirt section (32) outwardly protrudes out of the radial outer side of the inflow end of the outer body section, the outer skirt section, the inner skirt section and the section of the outer body section located between the outer skirt section and the inner skirt section jointly form an accommodating space with an outward opening.