Cannula Anchoring Struts for Tissue Stability
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Solution Overview
Problem
Existing cannulas lack effective anchoring mechanisms to securely position them within a patient's tissue, leading to potential dislodgment and compromised fluid flow.
Innovation Solution
A cannula design featuring an anchoring structure with a tubular body and strategically positioned struts that cross each other longitudinally, providing stable engagement with tissue surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cannula is inserted into tissue to create flow conduits, then fluid flow between vessels or to/from organs is enabled, but the cannula may become dislodged or shift position due to lack of anchoring
Solution Approach 1:
The anchoring structure is divided into multiple struts (first plurality and second plurality) that extend from the tubular body at different longitudinal positions and circumferential locations. These segmented struts independently engage with tissue at different points, providing stable anchoring while maintaining a relatively simple overall structure.
Solution Approach 2:
The struts extend radially outward from the tubular body in addition to the longitudinal axis, creating a three-dimensional anchoring configuration. This dimensional extension allows the struts to engage tissue surfaces perpendicular to the cannula's longitudinal axis, preventing dislodgment without requiring excessive longitudinal complexity.
2Reliability
If anchoring struts are added to secure the cannula, then dislodgment is prevented, but the struts may experience excessive strain or stress concentration
Solution Approach 1:
The anchoring function is segmented across multiple struts distributed at different longitudinal positions and circumferential locations around the tubular body. This segmentation distributes the anchoring load across multiple structural elements, preventing excessive strain concentration on any single strut and maintaining overall structural integrity.
Solution Approach 2:
Multiple struts are combined into a unified anchoring structure that works collectively to secure the cannula. The struts function as an integrated system where each strut contributes to the overall anchoring force, sharing the mechanical load and reducing stress on individual components.
3Reliability
If struts extend radially outward to engage tissue surfaces, then anchoring effectiveness is improved, but the delivery profile and ease of insertion may be compromised
Solution Approach 1:
The struts are designed to transition from a compressed, low-profile configuration during delivery to an expanded, radially extended configuration upon deployment. This dynamic transformation allows the struts to achieve effective tissue engagement after insertion while maintaining a compact profile during the delivery and insertion process.
Solution Approach 2:
The struts are arranged to nest within or alongside the tubular body during the delivery phase, creating a compact nested structure that facilitates easy insertion through delivery catheters. Upon deployment, the struts unfold or extend from this nested configuration to achieve their full radial anchoring capability.
Data Source
AI summary
Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that may include an inflow or outflow cannula apparatus.