Catheter Balloon Filter Sheath for Flow Maintenance
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Solution Overview
Problem
Existing catheter systems face challenges in performing medical procedures within blood vessels without occluding blood flow while preventing the downstream migration of particulate matter, and they often have complex deployment and retraction schemes for filters.
Innovation Solution
A catheter system with a non-occlusive inflatable structural balloon that maintains blood flow through flow cells and a collapsible filter sheath coupled to the balloon, which expands to engage with the vessel wall and captures particulate matter during procedures, allowing for continuous fluid communication and reliable retention of debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an occlusive balloon is used to prevent particulate migration, then downstream migration of particulate is prevented, but tissue damage occurs due to lack of downstream blood flow
Solution Approach 1:
The balloon is designed with a porous structure containing multiple pores that allow blood flow to pass through while capturing particulate matter. This enables the balloon to retain particulates effectively while maintaining downstream blood flow, preventing tissue damage that would result from complete occlusion.
2Reliability
If a filter sheath is deployed to capture particulate matter, then downstream migration is prevented, but the deployment and retraction schemes become complicated
Solution Approach 1:
The filter sheath is integrated with the balloon structure, where the balloon serves dual functions as both the expansion mechanism and the particulate capture device. The filter sheath is coupled to the balloon such that inflation of the balloon automatically deploys the filter sheath, and deflation automatically retracts it, simplifying the deployment and retraction schemes while maintaining reliable particulate retention.
3Reliability
If a collapsible filter is used to prevent particulate migration, then downstream migration is prevented, but blood flow occlusion occurs
Solution Approach 1:
The balloon incorporates a porous structure with multiple pores that allow blood flow to pass through while capturing particulate matter. This design enables the filter to retain particulates effectively while maintaining downstream blood flow, preventing the blood flow occlusion that would result from a solid collapsible filter.
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 system effectively prevents downstream migration of particulate matter while maintaining blood flow, simplifying the deployment and retraction of filters, and can be used for various medical procedures including thrombectomy and stent deployment without causing tissue damage from occlusion.
Implementation Method 1
an inflatable structural balloon (151) configured to expand to an expanded configuration in which the filter sheath (142) is deployed
Implementation Method 2
capturing any particulate matter (52) in the subject vessel downstream from the treatment site
Data Source
AI summary
A catheter system includes an inflatable structural balloon and collapsible filter. The collapsible filter is deployable into an expanded configuration using the inflatable distal balloon. In the expanded configuration, one or more flow cells are formed between inflated portions of the balloon to provide continuous fluid flow between proximal and distal ends of the structural balloon. In the expanded configuration, the filter is configured to prevent particulates (e.g., dislodged thrombus, or other particulate material) from migrating beyond the filter. In the expanded configuration, the inflated structural balloon biases a perimeter of the filter toward or against a subject vessel wall.