Expandable Catheter Perforation Repair with Perfusion Channels
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Solution Overview
Problem
Conventional methods for treating perforated vessels during percutaneous coronary intervention often block blood flow to downstream myocardium, as they occlude the vessel to allow clotting, which is undesirable, especially for perforations in major vessels.
Innovation Solution
A catheter assembly with an expandable unit that can be delivered through a body lumen in a collapsed configuration and expanded to cover a perforation, featuring blocking portions that prevent full circumferential expansion, creating perfusion channels to maintain blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional balloon is inflated to cover a perforation in a proximal vessel, then the perforation is occluded and clotting can occur, but blood flow to downstream myocardium is blocked
Solution Approach 1:
The balloon is segmented by including restraining filaments that create reverse curvature, dividing the balloon structure into sections that allow blood flow channels to pass through. This segmentation enables the balloon to occlude the perforation while maintaining perfusion channels for downstream blood flow.
Solution Approach 2:
The balloon structure is modified locally by adding restraining filaments at specific positions to create reverse curvature and blood flow channels. This local modification allows selective occlusion at the perforation site while preserving blood flow pathways in other regions of the balloon.
2Reliability
If a balloon is fully expanded to ensure complete coverage of the perforation, then occlusion effectiveness is improved, but blood flow channels are blocked
Solution Approach 1:
The balloon is divided into functional zones by restraining filaments that create reverse curvature. These filaments segment the balloon wall to form permanent blood flow channels that remain open even when the balloon is fully expanded, ensuring both complete perforation coverage and continuous blood flow.
Solution Approach 2:
The restraining filaments act as intermediary structures within the balloon wall, creating reverse curvature that serves as a mediator between the need for complete occlusion and the need for blood flow channels. The filaments maintain structural integrity while allowing fluid passage.
3Ease of operation
If a balloon is delivered through an introducer sheath in a collapsed configuration, then delivery feasibility is improved, but the balloon structure must be compact
Solution Approach 1:
The balloon structure is designed to be dynamic, transitioning from a collapsed configuration during delivery to an expanded configuration at the treatment site. The restraining filaments are integrated into the balloon wall in a way that allows them to function in both collapsed and expanded states, maintaining structural integrity throughout the delivery and deployment process.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present disclosure provides a catheter assembly including a catheter tube and an expandable unit attached to the catheter tube. The expandable unit is configurable in a collapsed configuration for facilitating delivery of the catheter assembly through a body lumen and a fully expanded configuration for contacting an interior wall of the body lumen to cover a perforation. The expandable unit defines a longitudinal channel extending from a proximal end to a distal end of the expandable unit when in the fully expanded configuration, permitting blood flow past the expandable unit. The disclosure further provides a method of treating a perforation by delivering a catheter assembly with an expandable unit to a perforation site, expanding the expandable unit to contact an interior wall of a body lumen to cover the perforation, and permitting blood flow past the expandable unit while in contact with the interior wall covering the perforation.