Patent ID: 9561323
Date: 2017-02-07
CPC Classifications: A61M,G01M

Claim:
1. A method of detecting leaks in a disposable medical fluid cassette, the medical fluid cassette comprising a base and a flexible membrane attached to the base in such a way that the base and the flexible membrane cooperate to at least partially form a fluid passageway, the method comprising: applying a first force to the flexible membrane with a piston configured to be advanced against and withdrawn from the flexible membrane; measuring a first physical property of a system that includes the medical fluid cassette and a medical fluid pumping machine while the first force is applied to the flexible membrane; removing the first force from the flexible membrane; separating the piston from the flexible membrane after removing the first force; advancing the piston against the flexible membrane after separating the piston from the flexible membrane; applying a second force to the flexible membrane after advancing the piston against the flexible membrane; measuring a second physical property of the system that includes the medical fluid cassette and the medical fluid pumping machine while the second force is applied to the flexible membrane; and determining whether the medical fluid cassette leaks based on a comparison of the first physical property and the second physical property.