Oscillating Drive Body Fluid Conveying Device
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Solution Overview
Problem
Conveying devices for sensitive fluids, such as blood, face challenges in providing sufficient conveying capacity while maintaining a compact construction for use within the body, minimizing shear forces, and managing pressure differences effectively.
Innovation Solution
A conveying device with a drive body that moves oscillationally transverse to the conveying direction, mimicking the movement of a fish fin, to generate relative movement with the fluid, using a fin-like element that is fixed in the conveying direction, with coordinated speed and surface alignment to prevent shear forces and pressure fluctuations, and optionally incorporating a control valve and elastic or stiff drive body configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotating rotor with impeller blades is used to convey fluid, then conveying capacity is improved, but construction complexity and risk of damaging sensitive fluids increase
Solution Approach 1:
Instead of using a rotating rotor that moves fluid through rotation, the patent inverts the approach by using an oscillating drive body that moves fluid through reciprocating motion. The drive body oscillates back and forth in a linear path, creating pressure differentials that propel fluid through the channel without rotation, thereby eliminating the complexity of rotational mechanisms while maintaining conveying capability
Solution Approach 2:
The patent employs dynamic oscillating motion of the drive body rather than static or continuous rotational motion. The drive body changes direction periodically, creating alternating pressure zones that drive fluid flow. This dynamic approach allows the system to achieve conveying capacity through temporal variation in motion rather than spatial rotation, simplifying the mechanical construction
2Productivity
If rotor rotational speed is increased to improve conveying capacity, then productivity increases, but shear forces that damage sensitive fluids increase
Solution Approach 1:
The patent replaces the rotational mechanical system with a reciprocating linear motion system. Instead of relying on high rotational speeds to generate conveying capacity, the oscillating drive body uses pressure differentials created by its back-and-forth motion. This substitution eliminates the direct correlation between speed and conveying capacity, allowing gentle handling of sensitive fluids while maintaining productivity through optimized oscillation frequency and amplitude
3Adaptability or versatility
If a compressible and expandable rotor construction is used to fit within blood vessels, then adaptability is improved, but construction complexity and manufacturing effort increase
Solution Approach 1:
The patent employs a flexible drive body that can be compressed and expanded radially. The drive body is constructed with flexible walls that allow it to be collapsed into a small profile for insertion through blood vessels, and then expanded to its operational size within the vessel. This flexible shell approach provides the necessary adaptability for minimally invasive placement while maintaining a relatively simple construction compared to complex mechanical expansion mechanisms
4Productivity
If impeller blade geometry is optimized for conveying capacity, then productivity improves, but pressure differences that may damage fluids over time increase
Solution Approach 1:
The oscillating drive body creates periodic pressure variations that drive fluid flow through the channel. By using periodic reciprocating motion rather than continuous rotation with optimized impeller geometry, the system achieves conveying capacity through temporal pressure cycling. This periodic action distributes pressure stresses over time, preventing the accumulation of high pressure differences that would occur with continuous high-pressure impeller operation, thereby protecting sensitive fluids from damage
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
This approach allows for reliable and gentle fluid conveyance with reduced construction complexity, efficient fluid movement, and minimized shear forces, particularly suitable for non-compressible fluids like blood, while avoiding the need for rotatable rotors and optimizing pressure management.
Implementation Method 1
the drive body is moved transversely to the conveying direction in the manner of a fin of a fish which is used in nature as a rule to generate a relative movement between the fin and a fluid
Implementation Method 2
the relative movement of the drive body or of different parts of said drive body with respect to the fluid to be driven
Data Source
AI summary
The invention relates to a conveying device for conveying a fluid in a conveying direction having one or more drive bodies which can be driven in an oscillating manner by means of a drive system transversely to the conveying direction. An acceleration of the fluid is achieved by a corresponding movement in translation or by a partially pivoting movement of the drive bodies in the manner of the fin principle known from biology (e.g. aerodynamics and hydrodynamics).