Pump Cartridge Positioning Features for Reliable IV Fluid Delivery
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Solution Overview
Problem
Existing infusion pumps face challenges in efficiently and safely delivering medical fluids while minimizing the risk of infection and contamination, particularly due to the disposable nature of IV tubes and cartridges, which often require complex and wear-prone latching mechanisms.
Innovation Solution
A pump system with a recess configured to receive a pump cartridge, featuring a cartridge-facing surface with orthogonal positioning features and engagement slots, including flat face ramps and fluid sensors, to securely and efficiently couple disposable IV cassettes, reducing the risk of improper installation and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex latching mechanisms are used to securely couple disposable IV cassettes, then the reliability of fluid delivery is improved, but the device complexity and wear increase
Solution Approach 1:
The patent extracts the latching function from complex mechanical mechanisms and relocates it to the disposable cassette itself through asymmetric positioning features. The reusable pump unit simply provides recesses that receive these features, eliminating the need for complex latching mechanisms in the reusable portion while maintaining secure coupling.
Solution Approach 2:
The patent places positioning and latching features on the disposable cassette rather than the reusable pump unit. This allows the complex positioning features to be discarded with the cassette after single use, eliminating wear concerns on expensive reusable components and reducing the complexity of the reusable pump unit.
2Manufacturing precision
If multiple positioning features are integrated into the cartridge interface, then the precision of cartridge installation is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the positioning function into multiple independent positioning features (first positioning feature, second positioning feature, etc.) that are distributed around the cartridge interface. Each feature can be independently manufactured and positioned, allowing for precise alignment through simple geometric shapes rather than complex integrated mechanisms.
Solution Approach 2:
The patent employs asymmetric positioning features where at least one positioning feature has an asymmetric geometry relative to the cartridge interface. This asymmetry provides inherent alignment guidance during installation, ensuring precise orientation without requiring complex alignment mechanisms or procedures.
3Stability of the object's composition
If the pump unit is designed with integrated cassette recesses, then the overall system compactness is improved, but the volume of the pump unit increases
Solution Approach 1:
The patent designs the pump unit with recesses that receive and nest the disposable cassettes. The cassettes are positioned within the pump unit volume, with positioning features that fit into corresponding recesses. This nesting arrangement creates a compact integrated system while the reusable pump unit maintains a manageable size by efficiently accommodating the disposable components.
Data Source
AI summary
Pump systems are described. An example pump system may include a processing unit and a recess configured to receive a pump cartridge. The recess can include a plurality of cartridge engagement slots. The cartridge engagement slots can be configured for removably coupling the pump cartridge. The recess can also include a cartridge-facing surface with a positioning feature slot extending orthogonal to a general plane of the cartridge-facing surface.