Bio-medical flow sensor
Patent 4384578 Issued on May 24, 1983. Estimated Expiration Date: 
April 16, 2001. 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.
April 16, 2001. 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 2446283 2994222 3091239 3500686 Drop rate sensing and regulating apparatus Device for regulating perfusion flowrate Patent #: 4029094 InventorAssigneeApplicationNo. 06/254688 filed on 04/16/1981US Classes:604/114, Electric means392/470, Disposable cartridge, tube or bag forms heated flow path (e.g., blood bag, etc.)392/480, Pipe or tube forms flow path604/151, Material impelled by pump73/204.22With sensor housingExaminersPrimary: Truluck, Dalton L.Attorney, Agent or FirmInternational ClassesA61M 5/168 (20060101)A61M 5/44 (20060101) A61M 5/36 (20060101) AbstractA bio-medical flow sensor (FIG. 1) including a packageable unit of a bottle (10), tubing (11) and hypodermic needle (12) which can be pre-sterilized and is disposable. The tubing (11) has spaced apart tubular metal segments (18,19). The temperature of the metal segments and fluid flow therein is sensed by thermistors (23,24) and at a downstream location heat is input by a resistor 25 (FIG. 2) to the metal segment (19) by a control electronics (16, FIG. 2). The fluid flow and the electrical power required of the resistor (25) to maintain a constant temperature differential between the tubular metal segments (18,19) is a measurable function of fluid flow through the tubing (11). The differential temperature measurement is made in a control electronics 16 (FIG. 2) and also can be used to control a flow control valve or pump (17) on the tubing (11) to maintain a constant flow in the tubing (11) and to shut off the tubing when air is present in the tubing. | |
