Heart Valve Delivery System Capturing Wires Repositioning
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Solution Overview
Problem
Current percutaneous heart valve replacement techniques are invasive and lack the ability to reposition or retract valves once deployed, necessitating more invasive open-heart surgeries and posing risks such as infection and adverse effects from heart-lung machine use.
Innovation Solution
Development of stent-based delivery systems with compressible and expandable stents that can be deployed and repositioned using a delivery system with capturing wires and a sheath mechanism, allowing for antegrade or retrograde implantation and rotational orientation for optimal valve placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If percutaneous valve replacement is performed using conventional techniques, then the procedure is less invasive compared to open-heart surgery, but the valve cannot be repositioned or retracted once deployed
Solution Approach 1:
The delivery system employs a dynamic capturing mechanism where wires with movable flaps or extensions can transition between engaged and disengaged states. This allows the valve to be securely held during delivery and then released for repositioning if needed, providing operational flexibility while maintaining minimally invasive access
2Length of moving object
If the stent is compressed to fit within the catheter, then percutaneous delivery is enabled, but the stent structure must be expandable at the implantation site
Solution Approach 1:
The stent is nested within the catheter in a compressed state during delivery through the vascular system. At the implantation site, the stent is expanded outward from the catheter to its functional size, allowing it to provide structural support while maintaining the benefits of percutaneous delivery
Solution Approach 2:
The stent undergoes a parameter change in its dimensional state, transitioning from a compressed configuration that fits within the catheter to an expanded configuration that provides the necessary structural integrity for valve support and anchoring in the native tissue
3Reliability
If frictional engagement is used between the stent and native tissue, then valve positioning is maintained, but the valve cannot be easily repositioned
Solution Approach 1:
The capturing wires with movable flaps act as an intermediary between the delivery system and the valve. This intermediary mechanism allows for controlled engagement and disengagement, enabling the valve to be securely positioned during delivery while permitting repositioning by disengaging the capturing mechanism before final deployment
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
Enables minimally invasive implantation and repositioning of heart valves, reducing surgical risks and improving placement accuracy through the use of self-expanding or balloon-expandable stents and a delivery system that maintains stent structures in a compressed state during insertion and expands at the desired location.
Implementation Method 1
the stent structure is expandable from the compressed state to the expanded state
Implementation Method 2
the stents can also become at least partially embedded in the surrounding tissue in response to the radial force provided by the stent and balloons
Data Source
AI summary
A delivery system for delivery of an implantable stented device to a body lumen that includes an elongated member having a distal tip and a proximal end portion, a wire connection member positioned between the distal tip and proximal end portion of the elongated member, and a plurality of capturing wires extending from a distal end of the wire connection member. Each of the capturing wires includes a distal end having a lower portion that is moveable relative to an upper portion between an open position and a closed position, and a slot defined by the upper and lower portions when they are in the closed position.