Fluid Pump Housing with Stabilisation Chambers for Dynamic Shape Control
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Solution Overview
Problem
Existing micromechanical fluid pumps used in medical technology, particularly in invasive medicine, face challenges in designing a housing that can efficiently compress and expand to navigate through blood vessels while maintaining stability during operation.
Innovation Solution
The housing is designed to change shape and size between a compressed and expanded state through the use of stabilisation chambers that can be supplied with fluid pressure, altering material stresses in the housing walls to facilitate compression and expansion, with features such as recessed cavities and semipermeable membranes to manage fluid and gas transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the housing is designed to be compressible for insertion into blood vessels, then the ease of operation is improved, but the stability during operation deteriorates
Solution Approach 1:
The housing is designed with dynamic properties that allow it to transition between compressed and expanded states. The housing wall contains stabilisation chambers that can be inflated to stabilize the housing structure during operation, while allowing compression during insertion. This dynamic adaptation resolves the contradiction between ease of insertion and operational stability.
Solution Approach 2:
The housing utilizes changes in internal pressure parameters through the stabilisation chambers to alter its structural properties. By controlling the pressure in the stabilisation chambers, the housing can transition between a compressed state for insertion and a stable expanded state during operation, resolving the contradiction between compressibility and stability.
2Productivity
If the housing is expanded to increase pump power, then the productivity is improved, but the length of the housing increases making insertion difficult
Solution Approach 1:
The housing diameter is made dynamically adjustable through the stabilisation chambers. During insertion, the housing is in a compressed state with reduced diameter for easy passage through blood vessels. During operation, the stabilisation chambers are inflated to expand the housing to its full size, increasing pump power capacity. This dynamic size adjustment resolves the contradiction between productivity and insertability.
3Weight of moving object
If the housing walls are made thin to reduce weight, then the weight of the housing is reduced improving ease of insertion, but the strength deteriorates reducing stability
Solution Approach 1:
The housing wall is segmented into functional zones: thin sections for weight reduction and ease of insertion, and reinforced sections with stabilisation chambers for structural strength. The stabilisation chambers act as internal support structures that provide strength only where needed during operation, allowing the overall housing to remain lightweight while maintaining necessary strength.
Solution Approach 2:
The housing employs composite construction combining thin-walled materials for the outer shell with internal stabilisation chambers filled with fluid or gas. This composite structure provides the necessary strength without requiring uniformly thick walls, thus maintaining low weight while ensuring structural integrity during operation.
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 design allows for a housing that is compressible for insertion and stable during operation, enabling efficient fluid pumping with reduced diameter in the expanded state, enhancing the compression of the conveying element and maintaining structural integrity during pulsating pumping.
Implementation Method 1
the housing, with respect to the shape and/or size thereof, can be changed between at least a first, expanded state and a second, compressed state, as a result of the fact that it has at least one stabilisation chamber which can be supplied with a fluid pressure
Data Source
AI summary
The invention relates to a fluid pump having a housing delimiting a fluid chamber and having a conveying element for the fluid disposed in the fluid chamber, the housing, with respect to the shape and/or size thereof, being able to be changed between at least a first, expanded state and a second, compressed state. The object, to stabilise adequately a corresponding housing, is achieved according to the invention by the housing having at least one stabilisation chamber which can be supplied with a fluid pressure and is different from the fluid chamber, the first state of the housing being assigned to a first fluid pressure in the stabilisation chamber and the second state of the housing being assigned to a second fluid pressure.