VAD Pump Housing Diffuser Reduces Pressure Loss
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Solution Overview
Problem
Current ventricular assist devices (VADs) experience significant pressure loss and reduced efficiency due to abrupt cross-sectional changes when pumping blood from a small pump diameter to a larger vessel diameter, leading to suboptimal cardiovascular support in heart failure patients.
Innovation Solution
A pump housing device with a diffuser that can be coupled with the housing apparatus and transferred into an operating position to guide fluid transversely after passing through the outlet opening, reducing pressure loss by increasing the cross-sectional area in the flow direction, and is designed to be minimally invasive with a flexible and foldable structure using materials like Nitinol and silicone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pump outlet is directly connected to a larger diameter vessel, then the device structure is simple, but significant pressure loss occurs due to abrupt cross-sectional changes
Solution Approach 1:
A diffuser component is introduced as an intermediary element between the pump outlet and the larger diameter vessel. The diffuser has a gradually increasing cross-sectional area that mediates the transition from the small pump outlet to the large vessel, preventing abrupt cross-sectional changes and reducing pressure loss while maintaining flow efficiency.
Solution Approach 2:
The diffuser employs curved, tapered surfaces instead of abrupt straight transitions. The gradual curvature of the diffuser walls creates a smooth flow path that reduces turbulence and pressure loss during the expansion from the pump outlet to the vessel, while the overall structure remains relatively simple.
2Loss of energy
If a diffuser is added to reduce pressure loss, then pump efficiency is improved, but the device complexity increases
Solution Approach 1:
The diffuser is integrated with the inlet hose as a single combined component rather than separate parts. This merging reduces the number of discrete components and assembly steps, thereby limiting the increase in device complexity while still providing the pressure loss reduction benefits of the diffuser geometry.
Solution Approach 2:
The diffuser-inlet hose combination serves multiple functions: it guides fluid flow, reduces pressure loss through gradual expansion, and provides structural support for pump implantation. This multi-functionality justifies the added complexity by delivering multiple benefits from a single integrated component.
3Ease of operation
If the pump housing device is designed for minimal invasiveness with foldable structure, then ease of implantation is improved, but the diffuser must be collapsible which may affect structural integrity
Solution Approach 1:
The diffuser is designed with dynamic characteristics, being collapsible to a compressed state for minimally invasive implantation and then expandable to its functional shape once positioned. This dynamic transformation allows the device to adapt between different operational states (implantation vs. function) without compromising the integrity of the underlying pump system.
Solution Approach 2:
The diffuser employs flexible materials and thin-walled structures that can be compressed for implantation through small incisions while maintaining sufficient structural integrity when expanded to their functional configuration. The flexibility enables minimal invasiveness while the material properties ensure the diffuser can withstand operational pressures and maintain its shape during pumping.
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 solution significantly reduces pressure loss and enhances pump efficiency by smoothing the cross-sectional transition, allowing for a larger volume flow with minimal invasiveness and improved flow routing.
Implementation Method 1
A pump housing device with a diffuser that can be coupled with the housing apparatus and transferred into an operating position to guide fluid transversely after passing through the outlet opening, reducing pressure loss by increasing the cross-sectional area in the flow direction
Implementation Method 2
designed to be minimally invasive with a flexible and foldable structure using materials like Nitinol and silicone
Implementation Method 3
The diffuser can be formed to be transferable from a rest position to the operating position and/or from the operating position to the rest position
Data Source
AI summary
The approach presented here relates to a pump housing device (300) for guiding a fluid (215). The pump housing device (300) has a housing apparatus (115) and a diffuser (305). The housing apparatus (115) is designed to accommodate at least one component of a pump (105) for pumping the fluid (215) through the housing apparatus (115), the housing apparatus (115) having at least one outlet opening (120) for letting out the fluid (215) which can be or is pumped by the pump (105). The diffuser (305) is or can be coupled to the housing apparatus (115) and/or to a supply hose is arranged and/or formed in an operating position (310) in order to guide the pumped fluid (215) transversely to the outlet opening (120) after said fluid has passed through the outlet opening (120).