Membrane-Sealed Dialysis Pump Chambers to Prevent Liquid Leakage
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Solution Overview
Problem
Existing pump devices for hemodialysis suffer from liquid leakage during piston motion and require precise control of electromagnetic valves, and detachment of chambers leads to scattering of residual dialysate or drain liquid.
Innovation Solution
A pump device with flexible dividing membranes that close accommodation parts, allowing detachable chambers to be sealed, using a drive source to displace membranes for suction and discharge, and incorporating check valves to manage fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If chambers are made detachable for replacement, then ease of maintenance is improved, but liquid leakage occurs when chambers are detached
Solution Approach 1:
The pump device applies preliminary anti-action by automatically closing the accommodation parts with dividing membranes before the chamber is detached from the pump body. This prevents liquid leakage before it can occur, resolving the contradiction between ease of maintenance and liquid leakage prevention.
Solution Approach 2:
The pump device performs preliminary action by sealing the accommodation parts with dividing membranes prior to chamber detachment. This ensures that any residual liquid is contained within the sealed accommodation parts, preventing leakage during maintenance operations.
2Measurement precision
If electromagnetic valves are used for fluid control, then fluid management precision is improved, but device complexity increases
Solution Approach 1:
The pump device extracts and removes the electromagnetic valves from the system, replacing them with a simpler membrane-based fluid control mechanism. This reduces device complexity while maintaining adequate fluid management precision through the automatic opening and closing actions of the dividing membranes.
Solution Approach 2:
The pump device implements self-service by using the dividing membranes to automatically control fluid flow without requiring external electromagnetic valves. The membranes open and close based on the operational state of the pump, providing self-regulating fluid management that reduces system 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
Prevents scattering of residual dialysate or drain liquid during chamber detachment and simplifies fluid management without additional pumps or electromagnetic valves, ensuring efficient and controlled fluid transfer.
Implementation Method 1
a drive source, and a driven part configured to move with activation of the drive source and to displace the dividing membranes
Implementation Method 2
dividing membranes each being a flexible member attached to a corresponding one of the supply chamber and the drain chamber in such a manner as to close a corresponding one of the supply-side accommodation part and the drain-side accommodation part
Data Source
AI summary
A pump device includes a supply chamber having a supply-side accommodation part; a drain chamber having a drain-side accommodation part; dividing membranes each being a flexible member that closes a corresponding one of the supply-side accommodation part and the drain-side accommodation part, the dividing membranes displaceable relative to the supply-side accommodation part and the drain-side accommodation part to cause dialysate to be suctioned into and discharged from the supply-side accommodation part through a liquid-supply-side connection port and cause drain liquid to be suctioned into and discharged from the drain-side accommodation part through a liquid-drain-side connection port; and a pump body from which the supply chamber or the drain chamber is detachable and attachable with the supply-side accommodation part or the drain-side accommodation part being closed by the corresponding dividing membrane, the pump body including a piston to move with activation of a motor and to displace the dividing membranes.