Dialyzer Branching and Pump Synchronization for Blood Return
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Solution Overview
Problem
The existing dialysis apparatus experiences excessive positive pressure in the flow route between the blood pump and the dialysate infusing pump during the blood-returning process due to errors in flow rate, which can lead to flow route breakdown.
Innovation Solution
A dialysis apparatus with a dialysate infusing line branched into two flow routes, where the dialysate infusing pump's rotational speed is synchronized to be higher than the blood pump's by a predetermined ratio, and a valve device controls the dialysate supply to prevent backflow and excessive pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blood pump and dialysate infusing pump are connected in series during blood-returning process, then the blood return function is achieved, but excessive positive pressure occurs in the flow route due to flow rate errors
Solution Approach 1:
The dialysate infusing line is divided into two separate flow routes (first and second branch ends) instead of a single series connection. This segmentation allows dialysate to flow through parallel paths, preventing excessive pressure buildup when pump flow rates differ during blood-returning process
Solution Approach 2:
The dialysate infusing line acts as an intermediary flow path between the blood pump and the venous blood circuit. By providing this intermediate dialysate flow route, the system accommodates flow rate differences between pumps and prevents direct pressure transmission that would cause flow route breakdown
2Reliability
If the dialysate infusing pump operates at higher rotational speed than blood pump, then stable dialysate flow is maintained, but dialysate consumption increases
Solution Approach 1:
The system dynamically adjusts the rotational speed of the dialysate infusing pump to be higher than the blood pump during blood-returning process. This dynamic speed adjustment ensures stable dialysate flow through the branched routes while the control system optimizes consumption by coordinating with the blood pump operation
Solution Approach 2:
The rotational speed parameter of the dialysate infusing pump is changed to be higher than that of the blood pump during blood-returning. This parameter change maintains stable dialysate flow pressure and prevents backflow, while the system coordinates pump operations to minimize unnecessary dialysate consumption
Data Source
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AI summary
An object of the present invention is to provide a dialysis apparatus which can prevent the generation of excessive positive pressure in the flow route between the blood pump and the dialysate infusing pump although there would be caused an error in the flow rate of the blood pump and the dialysate infusing pump during the blood-returning process. According to the present invention, there is provided a dialysis apparatus comprising a dialysate infusing line, one end of which being connected to the dialysate introducing line or the dialysate discharging line, the other end-side being branched out at a branch point into two flow routes respectively having a first branch end and a second branch end, the first branch end being able to be connected to the arterial blood circuit or the venous blood circuit, and the second branch end being able to be connected to the tip end of the arterial blood circuit during the blood-returning process, and a dialysate infusing pump arranged on the dialysate infusing line at a connection-side of the dialysate infusing line relative to the dialysate introducing line or the dialysate discharging line from the branch point for supplying the dialysate of the dialysate introducing line or the dialysate discharging line to the first branch end and the second branch end.