Hemodialysis Apparatus Negative Pressure Control
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Solution Overview
Problem
In hemodialysis apparatuses, the pressure increase during dialysis solution substitution leads to overflow of dialysis solution when the lid member is removed, resulting in unsanitary conditions.
Innovation Solution
A method and apparatus that create negative pressure in the dialysis solution circuit after filling, preventing overflow by maintaining negative pressure until the replacement fluid port is opened, using control means to manage the dialysis solution flowing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dialysis solution substitution step is performed to fill the dialysis solution circuit, then the dialysis solution circuit is properly filled with dialysis solution, but the pressure in the dialysis solution circuit increases causing overflow when the lid member is removed
Solution Approach 1:
The patent applies preliminary action by performing the negative pressure forming step before opening the lid member. The control unit creates negative pressure in the dialysis solution circuit prior to lid removal, which prevents overflow when the lid is subsequently opened. This sequential arrangement ensures that the circuit is prepared in advance to accommodate the pressure change without causing dialysis solution to spill out.
2Ease of operation
If the lid member is removed to connect the replacement fluid passage, then the replacement fluid port becomes accessible for connection, but dialysis solution overflows to the outside creating unsanitary conditions
Solution Approach 1:
The patent applies preliminary anti-action by creating negative pressure in the dialysis solution circuit before the lid member is removed. This negative pressure state counteracts the potential overflow tendency that would occur when the lid is opened. By establishing this opposing pressure condition in advance, the system prevents the harmful overflow effect while still allowing the replacement fluid port to be accessed for connection.
3Object-affected harmful factors
If negative pressure is formed in the dialysis solution circuit after dialysis solution substitution, then dialysis solution overflow is prevented when the replacement fluid port is opened, but additional time is required for pressure adjustment
Solution Approach 1:
The patent applies self-service by utilizing the existing dialysis solution circulation system to automatically create and maintain the negative pressure state. The control unit activates the dialysis solution circulation device to draw dialysis solution through the circuit, which naturally generates the required negative pressure without requiring external vacuum equipment or manual intervention. This self-contained approach minimizes additional time requirements while effectively preventing overflow.
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
Prevents dialysis solution overflow when connecting the replacement fluid passage, ensuring sanitary operations by maintaining negative pressure in the dialysis solution circuit.
Implementation Method 1
dialysis solution flowing means having a construction capable of forming a negative pressure in the dialysis solution circuit
Data Source
AI summary
A hemodialysis apparatus 1 is provided with a dialyzer 2 for performing hemodialysis, a blood circuit 3 connected to the dialyzer, a dialysis solution circuit 4 connected to the dialyzer, a replacement fluid port 31 provided in the dialysis solution circuit and capable of being opened and closed by a lid member, and a replacement fluid passage 6 having its one end connected to the blood circuit and the other end connected to the replacement fluid port.