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Our customer—a large medical equipment manufacturer—required a new design for a precision metering pump for blood analysis sampling. The component was to be used in a disposable cartridge, so relative cost was an issue.
The incumbent peristaltic pump design presented several problems, including: inconsistent/pulsed flow, inertial flow after pump shut off, drawback/reverse flow issues, and variability in flow based on the extruded tubing. The pump required intensive labor during assembly, further driving up the costs of manufacturing the finished cartridge.