Heart Valve Prosthesis Positioning Elements Anchoring
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Solution Overview
Problem
Current methods for percutaneous mitral valve replacement face challenges in accommodating the unique structural requirements of the mitral valve, particularly in positioning and anchoring the prosthesis effectively within the native valve site without obstructing the left ventricular outflow tract.
Innovation Solution
A heart valve prosthesis with a tubular stent and prosthetic valve component, featuring positioning elements that transform from a distally-extending to a proximally-extending configuration, utilizing self-expanding materials and U-shaped or V-shaped support arms to securely anchor the prosthesis within the mitral valve, minimizing protrusion into the left ventricle and ensuring proper positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional percutaneous valve replacement methods are used, then the prosthesis can be delivered through the vasculature, but the positioning and anchoring within the native mitral valve is difficult without obstructing the left ventricular outflow tract
Solution Approach 1:
The positioning elements are designed to dynamically change configuration during deployment. They transition from a compressed distally-extending configuration during delivery to an expanded proximally-extending configuration at the implantation site, allowing automatic adaptation to the native valve anatomy without requiring complex manual positioning mechanisms
Solution Approach 2:
The anchoring function is segmented into multiple positioning elements distributed around the prosthesis. Each positioning element independently engages with the native valve tissue, distributing the anchoring load and providing stable positioning without requiring a single complex anchoring mechanism that could obstruct the outflow tract
2Stability of the object's composition
If the prosthesis is anchored securely within the native valve, then positioning stability is improved, but the risk of obstructing the left ventricular outflow tract increases
Solution Approach 1:
Instead of extending positioning elements distally into the left ventricle (conventional approach), the positioning elements are designed to extend proximally toward the left atrium after expansion. This inverted configuration achieves secure anchoring by engaging the native valve ring and tissue while maintaining clearance from the left ventricular outflow tract, eliminating the obstruction risk
Solution Approach 2:
The positioning elements exhibit different configurations in different spatial zones: distally they are compressed to minimize profile during delivery, while proximally they extend to engage the native valve tissue for stable anchoring. This localized differentiation allows secure fixation without ventricular obstruction
3Measurement precision
If the positioning elements translate more than ninety degrees during deployment, then precise positioning is achieved, but the deployment complexity increases
Solution Approach 1:
The positioning elements perform self-positioning through their own structural transformation during deployment. As the prosthesis is deployed, the positioning elements automatically translate more than ninety degrees from distal to proximal orientation, using the deployment force itself to achieve precise positioning without requiring additional complex deployment mechanisms or manual manipulation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise anchoring and deployment of the valve prosthesis at the mitral valve site, reducing the risk of obstructing the left ventricular outflow tract and improving the effectiveness of mitral valve replacement procedures.
Implementation Method 1
The stent has a compressed configuration for delivery within a vasculature and a deployed configuration for deployment within a native heart valve
Implementation Method 2
each support arm bends radially outward and then towards an outer surface of the stent such that it translates more than ninety degrees from the compressed configuration to proximally extend from the distal end of the stent
Data Source
Figure 1A~2B
Figure 3~4
Figure 5~6
AI summary
A heart valve prosthesis (700) configured for deployment within a native heart valve. The heart valve prosthesis includes a tubular stent and a prosthetic valve component disposed within and secured to the stent. In addition, at least two positioning elements (720) are coupled to a distal end of the stent to position and anchor the prosthesis within the native heart valve. Each positioning element transforms from a compressed configuration in which the positioning elements distally extend from the distal end of the stent to a deployed configuration in which the positioning elements proximally extend from the distal end of the stent. Each positioning element includes at least one U-shaped or V-shaped support arm that bends radially outward and then towards an outer surface of the stent such that it translates more than ninety degrees from the compressed configuration. Each positioning element may include an outer support arm and an inner support arm.