Fluid property measurement devices, methods, and systems
First Claim
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1. A vessel/channel with a temperature detecting device, comprising:
- a first temperature sensor attached to or placed against a wall of a vessel/channel configured for carrying or containing a fluid;
a second temperature sensor separated from the first temperature sensor along an axis by an insulating body having a thermal resistance similar to the vessel/channel wall; and
a temperature regulating device in thermal contact with the second temperature sensor and configured to receive first and second temperature indication signals, respectively, from the first and second temperature sensors, whereinthe temperature regulating device is further configured to minimize a difference in temperatures indicated by said first and second temperature signals by regulating a rate of flow of heat between the first and second temperature sensors,the first temperature sensor has at least one substantially planar face normal to said axis;
the temperature regulating device has a surface substantially parallel to the planar face of the first temperature sensor and extending beyond the planar face.
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Abstract
High accuracy temperature measurement devices, methods, and systems for measuring the temperature of medical fluids are described. In embodiments, the devices have the features that they are compatible with the measurement of temperatures in a sealed fluid circuit, thereby promoting compatibility with sterile disposable circuits. Also described are combinations of temperature sensors and conductivity measurement for precise determination of the concentration of ions in a medicament.
39 Citations
28 Claims
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1. A vessel/channel with a temperature detecting device, comprising:
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a first temperature sensor attached to or placed against a wall of a vessel/channel configured for carrying or containing a fluid; a second temperature sensor separated from the first temperature sensor along an axis by an insulating body having a thermal resistance similar to the vessel/channel wall; and a temperature regulating device in thermal contact with the second temperature sensor and configured to receive first and second temperature indication signals, respectively, from the first and second temperature sensors, wherein the temperature regulating device is further configured to minimize a difference in temperatures indicated by said first and second temperature signals by regulating a rate of flow of heat between the first and second temperature sensors, the first temperature sensor has at least one substantially planar face normal to said axis; the temperature regulating device has a surface substantially parallel to the planar face of the first temperature sensor and extending beyond the planar face. - View Dependent Claims (2, 3, 4)
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5. A temperature detecting device, comprising:
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a first temperature sensor attached to a flat member that is adapted to be placed against a wall of a vessel/channel configured for carrying or containing a fluid; a second temperature sensor separated from the first temperature sensor by an insulating air gap; a temperature regulating device in thermal contact with the second temperature sensor, and a controller configured to receive first and second temperature indication signals, respectively, from the first and second temperature sensors and to regulate said temperature regulating device responsively to the temperature indication signals therefrom; the controller being configured to regulate a heat flux rate through said flat member responsively to said temperature indication signals from said first and second temperature sensors such that a temperature of at least said first temperature sensor indicates a temperature of a fluid on a side of said wall opposite said first temperature sensor. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A temperature detecting device, comprising:
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a first temperature sensor attached to a first flat member that includes a first flexible circuit substrate and is adapted to be placed against a wall of a vessel/channel configured for carrying or containing a fluid; a second temperature sensor attached to a second flat member that includes a second flexible circuit substrate, separated from the first temperature sensor by a spacer having a toroidal shape; a temperature regulating device in thermal contact with the second flat member opposite the second temperature sensor, and a controller configured to receive first and second temperature indication signals, respectively, from the first and second temperature sensors and to regulate said temperature regulating device responsively to the temperature indication signals therefrom; the controller being configured to regulate a heat flux rate through said first flat member or said second flat member responsively to said temperature indication signals from said first and second temperature sensors such that a temperature of at least said first temperature sensor indicates a temperature of a fluid on a side of said wall opposite said first temperature sensor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification