Negative pressure valving system and transmembrane pressure alarm system
Patent 4252651 Issued on February 24, 1981. Estimated Expiration Date: 
August 29, 1999. 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.
August 29, 1999. 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 2915077 2931343 3515275 3795318 3878095 Apparatus for extracorporeal treatment of blood Digital memory with power outage and memory overload logic in a dialysis system Patent #: 4098274 InventorAssigneeApplicationNo. 06/070871 filed on 08/29/1979US Classes:210/97, FLOW, FLUID PRESSURE OR MATERIAL LEVEL, RESPONSIVE137/625.64, Electric137/82, PRESSURE MODULATING RELAYS OR FOLLOWERS210/130, Fluid pressure responsive by-pass210/143, AUTOMATIC CONTROL210/321.65, Permeated liquid quantity measurement or control210/321.78, Cylindrical membrane210/929, HEMOULTRAFILTRATE VOLUME MEASUREMENT OR CONTROL PROCESSES604/66Sensor responsive to body conditionExaminersPrimary: Lander, Ferris H.Attorney, Agent or FirmInternational ClassesF16K 31/06 (20060101)A61M 1/16 (20060101) AbstractThere is disclosed herein a negative pressure dialysis machine which includes a negative pressure valving system and transmembrane pressure alarm system.An electromagnetically controlled flapper valve is disclosed herein for use as a negative pressure control valve. The flapper valve permits accurate control of negative pressure and changes in negative pressure to be affected rapidly.Transmembrane pressure alarm systems are provided which detect the difference in pressure between the blood and dialysate in the dialyzer and activate alarms and prevent dialysis (a) if the dialysate pressure exceeds the blood pressure and/or (b) if a blood pressure signal is not received which would permit actual transmembrane pressure to increase beyond a predetermined limit. | |
