Movable-Bead Atherectomy Catheters With Vibrating Core Wires
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Solution Overview
Problem
Traditional atherectomy devices require additional mechanisms to move abrasive elements across plaque, lacking an efficient method for simultaneous rotation and longitudinal movement.
Innovation Solution
An atherectomy device with a core wire that is vibrated by an excitation device, causing an abrasive bead to rotate and slide longitudinally, and is restricted by bumpers to control its travel length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If abrasive elements are fixedly coupled to a core wire for rotation, then the structure is simple, but an additional mechanism is required to move the abrasive element across the plaque
Solution Approach 1:
The abrasive bead is made movable relative to the core wire through sliding mounting, allowing it to move longitudinally along the wire without requiring additional rotation mechanisms. This dynamic arrangement enables the bead to travel across the plaque while the core wire provides rotational support.
Solution Approach 2:
The core wire is vibrated by an excitation device, and this vibration is transmitted to the abrasive bead, causing it to rotate about and slide longitudinally along the core wire. The vibration mechanism eliminates the need for separate rotation and movement mechanisms.
2Productivity
If the abrasive bead is allowed to move freely along the core wire, then the plaque coverage is improved, but the control of travel length becomes difficult
Solution Approach 1:
Bumpers are positioned along the core wire to provide feedback on the bead's position and travel length. The bumpers restrict the bead's movement to a controlled range, ensuring precise travel length while maintaining effective plaque coverage during the atherectomy procedure.
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
Efficient plaque ablation with reduced friction and improved plaque removal efficiency through controlled bead movement and aspiration of debris.
Implementation Method 1
an excitation device operatively coupled to the core wire and configured to vibrate the core wire. Vibration of the core wire causes the abrasive bead to rotate about and slide longitudinally along the core wire
Data Source
AI summary
An atherectomy catheter for performing an atherectomy procedure, the atherectomy catheter includes a catheter body defining one or more lumens, a core wire extending through a core wire lumen of the one or more lumens of the catheter body, and an abrasive bead slidably mounted to the core wire. The core wire is configured to be coupled to an excitation device and operation of the excitation device causes the abrasive bead to rotate about and slide longitudinally along the core wire.