Variable-Stiffness Distal Extension for Stable Blood Pump Positioning
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Solution Overview
Problem
Blood pump assemblies face instability issues due to improper positioning, leading to potential damage to the heart and vasculature, and frequent repositioning disrupts patient care.
Innovation Solution
A variable-stiffness distal extension for blood pumps with a continuously varying stiffness profile, transitioning from a stiffer proximal portion to a softer distal portion, allowing for stable positioning and minimizing tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a distal extension with uniform stiffness is used, then the pump can be stabilized within the heart, but trauma to the vasculature and heart tissue increases
Solution Approach 1:
The distal extension is designed with non-uniform stiffness distribution along its length, where the proximal portion has higher stiffness to provide stability and the distal portion has lower stiffness to reduce tissue trauma. This local differentiation of mechanical properties allows the same structure to fulfill multiple conflicting requirements simultaneously.
Solution Approach 2:
The stiffness parameter of the distal extension is varied continuously along its length, transitioning from a stiffer proximal portion to a softer distal portion. This parameter change enables the extension to maintain structural integrity near the pump while becoming more compliant near the heart tissue, thereby reducing trauma.
2Reliability
If a stiffer distal extension is used, then the pump positioning is stabilized, but the risk of damage to heart tissue increases
Solution Approach 1:
Different sections of the distal extension are assigned different stiffness qualities: the proximal section near the pump has higher stiffness for reliable positioning, while the distal section near the heart tissue has lower stiffness to minimize damage risk. This spatial variation in material properties resolves the contradiction between reliability and harm reduction.
Solution Approach 2:
The distal portion of the extension is designed with lower stiffness beforehand to act as a cushioning element that protects heart tissue from damage. This pre-designed compliant section absorbs mechanical stresses and prevents direct transmission of harmful forces to the tissue.
3Ease of manufacture
If a step-wise stiffness profile is used, then manufacturing is simplified, but the mechanical properties are constrained and adaptability is reduced
Solution Approach 1:
The distal extension transitions from a static step-wise stiffness profile to a dynamic continuous gradient profile. This allows the stiffness to vary smoothly along the length of the extension, providing better adaptability to different anatomical configurations and mechanical requirements while maintaining manufacturing feasibility through modern fabrication techniques.
Data Source
AI summary
Systems and methods for providing a blood pump system having a variable stiffness distal extension are disclosed. A variable stiffness distal extension may have at least one section of continuously varying stiffness, resulting in a stiffness profile that decreases in a distal direction along a length of the distal extension. The varying stiffness may be accomplished by varying one or more radial dimensions of the extension. For example, in some implementations, an outer diameter of a distal extension may decrease along at least a portion of a distal extension. The distal extension may include a lumen configured to receive a longitudinally extending element.