Collapsible Catheter Blood Pump Housing for Stable Cardiac Outflow
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Solution Overview
Problem
There is a need for improved ventricular support devices and blood pumps to enhance cardiac outflow stability, particularly during medical procedures, to reduce the workload on the heart and stabilize patients with compromised cardiac function.
Innovation Solution
A catheter blood pump with an expandable pump portion featuring a scaffold-supported blood conduit and impellers, designed to be collapsible for minimally invasive insertion, which includes proximal and distal scaffolds with varying stiffness and configurations to minimize valve damage and improve pumping dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blood pump is designed with a rigid structure to provide stable blood flow support, then the pumping stability is improved, but the device cannot be delivered through minimally invasive access due to its size
Solution Approach 1:
The pump housing is designed to be dynamically reconfigurable between a collapsed delivery configuration and an expanded pumping configuration. The expandable pump portion includes a collapsible housing that can be compressed for delivery and then expanded at the target site to provide stable blood flow support, resolving the contradiction between size and stability.
Solution Approach 2:
The pump housing is divided into a collapsible housing portion and an expandable pump portion. The expandable pump portion includes a collapsible housing with an expandable impeller housing and blood conduit, allowing the device to be segmented into deliverable and functional portions that can be reconfigured at the target site.
2Stability of the object's composition
If the scaffold is made uniformly stiff to maintain blood conduit shape, then the structural stability is improved, but the valve may be damaged due to excessive rigidity
Solution Approach 1:
The scaffold is designed with non-uniform stiffness characteristics where different sections have different rigidity levels. The proximal and distal scaffold sections have different stiffness properties compared to the central scaffold section, allowing the blood conduit to maintain its shape while having softer regions that reduce the risk of valve damage during insertion and operation.
Solution Approach 2:
The scaffold's stiffness parameter is varied along its length, with the proximal and distal sections having different stiffness characteristics than the central section. This parameter change allows the scaffold to provide structural support where needed while being compliant in regions that contact the valve, preventing valve damage.
3Productivity
If the pump portion is expanded to provide adequate blood flow capacity, then the pumping performance is improved, but the delivery access becomes more difficult
Solution Approach 1:
The pump portion is designed with dynamic expandability, allowing it to be delivered in a collapsed state through small access sheaths and then expanded at the target site to provide adequate blood flow capacity. The expandable impeller housing and blood conduit can be inflated to their operational size after delivery, enabling both easy delivery and sufficient pumping performance.
Data Source
AI summary
Catheter blood pumps that include an expandable pump portion. The pump portions include an collapsible blood conduit that defines a blood lumen. The collapsible blood conduits include a collapsible scaffold adapted to provide radial support to the blood conduit. The pump portion also includes one or more impellers.