Artificial haemodialysis kidneys
Patent 3979284 Issued on September 7, 1976. Estimated Expiration Date: 
September 7, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 7, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3669880 3795318 InventorsAssigneeApplicationNo. 05/560861 filed on 03/21/1975US Classes:210/637, Including regulating pressure to control constituent gradient at membrane or to prevent rupture of membrane210/321.65, Permeated liquid quantity measurement or control210/647, Maintaining critical concentration(s)210/648, Including regenerating or rehabilitating the extracting liquid in liquid/liquid solvent or colloidal extraction210/929HEMOULTRAFILTRATE VOLUME MEASUREMENT OR CONTROL PROCESSESExaminersPrimary: Spear, Frank A. Jr.Attorney, Agent or FirmInternational ClassA61M 1/16 (20060101)Foreign Application Priority Data1972-07-31 FRAbstractAn artificial haemodialysing kidney and method of operation in which the haemodialyser has one chamber connectable to a blood stream and another chamber on the opposite side of its membrane forming part of a constant volume closed vessel for dialysis liquid. The system can be operated as a closed circuit during which time a fraction of the dialysis liquid is withdrawn from the constant volume closed vessel at a desired flow rate and the reduction in pressure then existing in the vessel near the membrane is noted. The system is then switched to open circuit with the dialysis liquid being fed from a source thereof and the used liquid is dumped, the pressure during this period being adjusted to the noted value. | |
