Ramped Stabilizing Wires for Low-Force Medical Device Recapture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional medical devices with stabilizing wires face difficulties in recapture due to the risk of delamination of the delivery sheath, leading to particulate formation and high recapture forces.
Innovation Solution
Incorporation of stabilizing wires with a ramped configuration, including a linear, hook, and ramp segment, allowing for selective movement between extended and retracted positions, which facilitates smooth recapture without delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stabilizing wires are used to prevent device migration, then device stability is improved, but recapture becomes difficult due to sheath delamination and high recapture forces
Solution Approach 1:
The stabilizing wire is designed with a ramp segment that allows it to dynamically change its radial position. During delivery, the wire extends radially outward to provide stability. During recapture, the ramp segment allows the wire to be pushed radially inward by the delivery sheath, transitioning from an extended stabilizing position to a retracted recapturable position, enabling easy recapture without sheath delamination
Solution Approach 2:
The stabilizing wire is segmented into distinct functional portions: a linear portion for structural support, a ramp segment for controlled radial transition, and a hook portion for anchoring. This segmentation allows each portion to perform its specific function independently, enabling the wire to provide stability when extended and facilitate recapture when retracted
2Stability of the object's composition
If stabilizing wires extend radially outward to prevent migration, then device stability is improved, but recapture force increases significantly
Solution Approach 1:
The ramp segment creates a dynamic mechanical advantage system. When the delivery sheath pushes against the ramp segment during recapture, the inclined surface converts the axial recapture force into a radial inward force on the stabilizing wire, reducing the force required to retract the wire compared to pulling it directly radially inward
Solution Approach 2:
The ramp segment acts as an intermediary mechanical element between the delivery sheath and the stabilizing wire. It mediates the force transmission by converting the axial motion of the delivery sheath into radial motion of the stabilizing wire, enabling recapture with reduced force
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 full recapture of medical devices with reduced force and minimizes sheath delamination, enhancing procedural safety and efficiency.
Implementation Method 1
a device body including at least one lobe formed from a shape memory material
Data Source
AI summary
A medical device including stabilizing wires that are selectively movable from a first and second position and a delivery system including the same are described herein. The medical device includes a device body and the stabilizing wires coupled thereto. Each stabilizing wire has a proximal and distal end. In the first position, at least a portion of the distal end extends radially outwardly from the device body, and in the second position, the distal end is retracted within the device body. Each stabilizing wire includes a linear portion at the proximal end, a hook portion at the distal end, and a ramp segment extending between the linear portion and the hook portion, including a ramp incline portion that extends at a first angle from the linear portion to a ramp apex, and a ramp decline portion that extends at a second angle from the hook portion to the ramp apex.