Membrane Pump Cassette for Low-Hemolysis Fluid Metering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current pumping systems for fluid management, particularly in medical applications like hemodialysis, face challenges in efficiently and effectively pumping fluids such as blood and pharmaceuticals, with issues related to shear forces, turbulence, and the need for precise fluid control and measurement.
Innovation Solution
The development of a pumping cassette with a housing containing reciprocating pressure displacement membrane pumps, metering pumps, and valves, which includes features like curved rigid chamber walls, flexible membranes, and air vents, allowing for efficient fluid pumping and administration, including the use of heparin, while minimizing shear forces and turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional pumping systems are used to pump blood and fluids, then fluid pumping function is achieved, but shear forces and turbulence increase causing hemolysis and foaming
Solution Approach 1:
The patent employs a pneumatic pump system where a flexible diaphragm is actuated by pneumatic pressure to pump fluid. The diaphragm moves back and forth in response to pneumatic pressure changes, creating a pumping action that reduces shear forces and turbulence compared to conventional mechanical pumps, thereby reducing hemolysis and foaming while maintaining effective fluid pumping.
Solution Approach 2:
The patent utilizes a flexible diaphragm as the core pumping element. This thin film component deforms under pneumatic pressure to displace fluid, providing a gentle pumping action that minimizes mechanical stress on blood cells and reduces harmful effects like hemolysis and foaming while maintaining pumping effectiveness.
2Measurement precision
If precise fluid control and measurement are implemented, then fluid administration accuracy is improved, but device complexity increases
Solution Approach 1:
The patent incorporates a fluid management system that automatically measures and controls fluid volume administered by the pneumatic pump. The system includes sensors and control mechanisms that self-regulate the pumping process, providing precise fluid volume measurement and control without requiring complex external monitoring equipment, thus improving measurement precision while managing device complexity.
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 cassette provides efficient and continuous fluid pumping with reduced hemolysis and foaming, enabling precise control and measurement of fluid volumes, suitable for medical applications like hemodialysis.
Implementation Method 1
at least one reciprocating pressure displacement membrane pump within the housing. The pressure pump pumps a fluid from the fluid inlet line to the fluid outlet line
Implementation Method 2
The flexible membrane and the rigid chamber wall define a pumping chamber
Data Source
AI summary
A pump cassette is disclosed. The pump cassette includes a housing having at least one fluid inlet line and at least one fluid outlet line. The cassette also includes at least one reciprocating pressure displacement membrane pump within the housing. The pressure pump pumps a fluid from the fluid inlet line to the fluid outlet line. A hollow spike is also included on the housing as well as at least one metering pump. The metering pump is fluidly connected to the hollow spike on the housing and to a metering pump fluid line. The metering pump fluid line is fluidly connected to the fluid outlet line.