Dialysis Apparatus Priming via Liquid Feeding Pump and Magnetic Gear
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Solution Overview
Problem
Current dialysis apparatuses face challenges in reducing the time required for priming operations and efficiently removing air bubbles from the blood circuit, due to the poor liquid feeding performance of traditional tube pumps, which can lead to air bubbles entering the patient's body during treatment.
Innovation Solution
A dialysis apparatus with a blood pump that includes a housing with an elastic tube and a rotor, where the tube attachment device switches between unattached and attached states to control dialysate circulation, utilizing a liquid feeding pump in the dialysate circuit to rapidly fill the blood circuit with dialysate and a magnetic gear pump to efficiently remove air bubbles through the water hammer phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tube pump is used to circulate dialysate in the blood circuit during priming, then the blood circuit can be filled with dialysate, but the liquid feeding performance is poor and the priming time becomes excessively long
Solution Approach 1:
The invention performs preliminary action by filling the blood circuit with dialysate through the dialysate circuit before the blood pump operation. The dialysate is circulated through the dialysate circuit to fill the blood circuit in advance, so that when the blood pump starts, the blood circuit is already primed, eliminating the time-consuming process of pumping dialysate through the blood pump.
Solution Approach 2:
The invention uses the dialysate circuit as an intermediary to transfer dialysate to the blood circuit. Instead of using the blood pump to feed dialysate directly into the blood circuit, the dialysate circuit serves as a mediator that efficiently delivers the dialysate, leveraging its superior liquid feeding performance.
2Reliability
If a tube pump is used during priming, then the blood circuit can be filled with dialysate, but air bubbles cannot be efficiently removed from the blood circuit
Solution Approach 1:
The invention performs preliminary air bubble removal by circulating dialysate through the blood circuit before blood pump operation. The dialysate flow through the dialysate circuit creates conditions that facilitate air bubble removal in advance, ensuring the blood circuit is free of air bubbles before treatment begins.
Solution Approach 2:
The invention uses hydraulic principles by circulating dialysate through the blood circuit via the dialysate circuit. The fluid dynamics of dialysate circulation create pressure variations and flow patterns that effectively remove air bubbles from the blood circuit, leveraging hydraulic effects for air bubble elimination.
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 solution significantly reduces the time needed for priming and ensures efficient removal of air bubbles from the blood circuit, enhancing the safety and efficiency of the dialysis process by using a combination of a liquid feeding pump and a magnetic gear pump to manage dialysate circulation and pressure.
Implementation Method 1
a magnetic gear pump to efficiently remove air bubbles through the water hammer phenomenon
Implementation Method 2
a housing that houses an elastic tube comprised in the blood circuit and a rotor that rotates inside the housing to rotate the tube while compressing the tube
Data Source
AI summary
A dialysis apparatus has a connection channel that communicatively connects a dialysate circuit and a blood circuit, and circulates dialysate from the dialysate circuit to the blood circuit via the connection channel during a priming operation. A blood pump has a tube attachment device that switches from an unattached state in which a tube is positioned outside a housing and permits liquid to circulate thereinside, to an attached state in which the tube is in the housing and a rotor compresses the tube. At the time of priming, the liquid feeding pump feeds dialysate from the dialysate circuit to the blood circuit via the connection channel. With the blood pump being in the unattached state, the dialysate is circulated past the blood pump, and then, with the blood pump in the attached state, the dialysate is circulated in a direction opposite to the blood pump.