Peritoneal Dialysis Cassette External Pump Integration
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Solution Overview
Problem
Conventional peritoneal dialysis systems require internal pumps and diaphragm pumps with complex vacuum and pressure management, making them costly and challenging to operate effectively.
Innovation Solution
A peritoneal dialysis cassette design that uses external pumps and inlet/outlet ports with valves to direct fluid flow, eliminating the need for internal pumps and vacuum pressure, and incorporating sensors for fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If internal diaphragm pumps are used within the cassette, then fluid can be pumped through the cassette, but the system requires complex vacuum and pressure control mechanisms
Solution Approach 1:
The patent extracts the pump function from the cassette body and relocates it to an external pump device. The cassette now only contains fluid channels and valve positions, while the external pump handles all fluid pumping operations through connections to inlet/outlet ports. This separation eliminates the need for internal diaphragm pumps and their associated vacuum/pressure control mechanisms within the cassette.
Solution Approach 2:
The patent introduces inlet/outlet ports as intermediary connection points between the external pump and the cassette fluid channels. These ports serve as mediators that allow the external pump to drive fluid through the cassette without requiring direct integration of pump mechanisms into the cassette structure, thereby simplifying the cassette design while maintaining pumping capability.
2Ease of operation
If diaphragm pumps with membranes are used, then fluid pumping is achieved, but custom membranes and airtight sealing components are required
Solution Approach 1:
The patent removes the diaphragm pump membrane and its associated custom sealing components from the cassette. The cassette is redesigned to contain only fluid channels and valve positions, while all pumping functions are performed by an external pump that connects to the cassette through standard inlet/outlet ports, eliminating the need for custom membranes.
Solution Approach 2:
The external pump serves as a universal fluid pumping device that can be used with the cassette without requiring custom-built components. The inlet/outlet ports are designed to accommodate standard pump connections, making the system more universally applicable and easier to manufacture without specialized membrane components.
3Reliability
If vacuum pressure is used to maintain airtight seal, then diaphragm pump membrane can be held against pumping surface, but precise pressure control is required
Solution Approach 1:
The patent extracts the vacuum pressure generation and maintenance functions from the cassette system and relocates them to the external pump. The external pump creates and maintains the necessary vacuum conditions for its own operation, eliminating the need for separate pressure control mechanisms within the cassette while maintaining reliable sealing at the pump-cassette interface.
4Ease of operation
If internal pumps are integrated into the cassette, then fluid can be moved through the cassette, but the system becomes costly and challenging to operate
Solution Approach 1:
The patent segments the peritoneal dialysis system into distinct functional modules: the cassette contains only fluid channels and valve positions for fluid distribution, while the external pump handles fluid pumping operations. This segmentation allows each component to be optimized independently and uses standard, off-the-shelf pump technology rather than custom-integrated pump systems, reducing overall system cost and operational complexity.
Solution Approach 2:
The patent uses standard external pump technology that can be readily obtained from commercial sources rather than designing and manufacturing custom internal pump systems. This approach leverages existing, well-understood pump designs and components, reducing development costs and simplifying operation and maintenance.
Data Source
AI summary
A peritoneal dialysis cassette that uses an external pump to drive fluid through the peritoneal dialysis cassette is provided. The peritoneal dialysis cassette can include two inlet/outlet ports connected to an inlet and outlet of the external pump. The external pump drives fluid through fluid passages in the peritoneal dialysis cassette connecting a plurality of other inlet/outlet ports, with one or more valves usable to selectively direct fluid through the peritoneal dialysis cassette.