Aspirating Filter Catheter Debris Extraction
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Solution Overview
Problem
Vascular procedures like angioplasty and thrombectomy dislodge debris into the bloodstream, which can occlude blood vessels, and existing filtration systems struggle to efficiently extract debris during and after filter deployment and retrieval.
Innovation Solution
An aspirating filter delivery catheter with aspiration ports and an operable end cap for extracting debris during deployment, and an aspirating filter retrieval catheter with an aspiration lumen and inflatable balloon for extracting debris trapped on the filter's proximal side, allowing for effective suction and filter collapse for removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filtration device is deployed distal of the target site to capture debris, then debris can be trapped in the filter, but the filter cannot be removed from the vasculature due to accumulated debris
Solution Approach 1:
The patent applies preliminary action by performing debris aspiration before filter deployment and again before filter retrieval. The aspiration catheter is positioned proximal to the filter to remove debris that accumulates on the proximal side of the filter, enabling successful filter retrieval without releasing debris into the bloodstream.
Solution Approach 2:
The patent introduces an intermediary aspiration catheter system that mediates between the trapped debris and the filter. This intermediary device allows debris removal through the catheter lumen while the filter remains in place, solving the contradiction between debris capture and filter retrievability.
2Object-generated harmful factors
If suction is applied during filter delivery to extract debris, then debris can be removed during delivery, but the catheter cannot traverse the target site effectively
Solution Approach 1:
The patent applies preliminary action by performing aspiration during the delivery phase before filter deployment. The aspiration catheter traverses the target site first, removing debris as it advances, which prepares the vessel for subsequent filter deployment without interfering with catheter traversal.
Solution Approach 2:
The patent segments the procedural steps into distinct phases: delivery aspiration, filter deployment, and retrieval aspiration. Each phase has dedicated aspiration ports and lumens optimized for that specific function, allowing debris removal without compromising catheter traversal capability in each segment.
3Device complexity
If existing filtration systems are used without aspiration capability, then the system is simpler, but debris accumulates and blocks downstream vessels
Solution Approach 1:
The patent applies multi-functionality by designing a unified catheter system that combines both filtration and aspiration capabilities in a single device. The delivery catheter and retrieval catheter each integrate multiple lumens for different functions (filter deployment, debris aspiration, contrast injection), eliminating the need for separate simple filtration devices and aspiration devices.
Solution Approach 2:
The patent uses pneumatic and hydraulic principles by applying suction pressure through the aspiration lumens to actively extract debris. The system utilizes pressure differentials created by the suction source to move debris through the aspiration ports and into collection vessels, effectively preventing downstream occlusion.
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 aspirating catheters efficiently extract debris during and after filter deployment and retrieval, preventing vessel occlusion and facilitating the removal of the filtration device without releasing debris into the bloodstream.
Implementation Method 1
suction may be applied to the proximal end of the elongated shaft for extracting, through the aspiration ports, debris resulting from the distal region of the delivery catheter traversing the target site
Data Source
AI summary
Embolic protection aspirators and methods for extracting debris from the vasculature during interventional procedures are provided. One such system may include an aspirating filter delivery catheter having a filtration device, an operable end cap, and a plurality of aspiration ports. The delivery catheter may be fluidly coupled to a suction providing means for extracting debris while traversing a target site for distal delivery of the filtration device. Another such system may include an aspirating filter retrieval catheter having an aspiration lumen and a balloon. The aspiration lumen may be fluidly coupled to a suction providing means for extracting debris from the filtration device prior to and/or during retrieval of the filtration device. By inflating the balloon to partially or fully restrict blood flow, suction pressure proximal of the filtration device may be increased to enhance debris extraction.