Infusion Pump Keypad Perimeter Gasket Fluid Ingress Protection
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Solution Overview
Problem
Typical infusion pump control unit keypads suffer from fluid ingress due to seams or gaps between components, leading to corrosion and damage, resulting in costly repairs and replacements.
Innovation Solution
The implementation of a pump control unit keypad assembly with a full perimeter gasket that provides a liquid-proof seal between the keypad components and the overlay, eliminating the need for fillers and preventing fluid ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple layers of components are stacked together like a sandwich to form the keypad, then the keypad structure is completed with all necessary components (overlays, protective liners, circuit layers), but seams or gaps are created that allow fluid ingress
Solution Approach 1:
A gasket is introduced as a flexible sealing element between the circuit assembly and overlay assembly. The gasket creates a fluid-tight barrier that prevents liquid ingress while allowing the multi-layer keypad structure to remain assembled and functional.
2Ease of manufacture
If seams or gaps are present between keypad components, then assembly is simpler and manufacturing is easier, but fluid can ingress into internal components causing corrosion and damage
Solution Approach 1:
The gasket acts as a flexible film that seals the interface between rigid keypad components. It conformally fills gaps and seams between the circuit assembly and overlay assembly, preventing fluid penetration without requiring complex sealing mechanisms.
3Reliability
If a full perimeter gasket is added to provide liquid-proof seal, then fluid ingress is prevented and reliability improves, but device complexity and manufacturing complexity increase
Solution Approach 1:
The gasket provides a complete perimeter seal around the keypad interface using a single continuous flexible element. This approach achieves comprehensive fluid protection without requiring multiple discrete sealing components or complex assembly steps.
Data Source
AI summary
Infusion systems are provided that include an infusion pump and a fluid ingress protection assembly. The fluid ingress protection assembly includes a cover assembly having an outer surface and an inner surface, a perimeter gasket disposed within a raised perimeter on the outer surface of the cover assembly, a lens coupled to the outer surface of the cover assembly, a circuit assembly coupled to the outer surface of the cover assembly, a switch assembly coupled to the circuit assembly, a shield assembly coupled to the switch assembly, the shield assembly comprising an electrostatic discharge shield and an overlay assembly coupled with the shield assembly. Methods of assembling an infusion system are also provided.