Medical fluid cassette leak detection methods and devices
First 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- applying a first force to the flexible membrane with a piston configured to be advanced against and withdrawn from the flexible membrane;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.
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Accused Products
Abstract
A method is provided for detecting leaks in a disposable medical fluid cassette that includes 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 includes applying a first force to the flexible membrane, measuring a first physical property of a system that includes the medical fluid cassette a medical fluid pumping machine, removing the first force from the flexible membrane, applying a second force to the flexible membrane, measuring a second physical property of the system, and determining whether the medical fluid cassette leaks based on a comparison of the first physical property and the second physical property.
501 Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification