Microwave apparatus for warming low flow rate infusates
First Claim
Patent Images
1. Infusate warming apparatus comprisinga housing defining an elongated microwave heating cavity having electrically conductive walls;
- a printed circuit board separating said cavity lengthwise into first and second cavity sections, said printed circuit board including a fluid impervious, electrically insulating substrate and an elongated conductor run having opposite ends, said conductor run extending along said substrate and facing one of said cavity sections;
a fluid inlet into, and a fluid outlet from, said first cavity section so that infusate can flow through said first cavity section andconnector means extending into said housing for coupling an external microwave signal of a selected frequency to, and a temperature sensing signal from, one end of said conductor run.
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Abstract
Microwave heating apparatus for warming low flow rate infusates includes an electrically conductive housing defining an elongated heating cavity and a printed circuit board which separates the cavity lengthwise into first and second cavity sections. The circuit board includes a substrate which provides a fluid-tight divider between the two cavity sections and a meandering conductor run which extends along the substrate.
161 Citations
17 Claims
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1. Infusate warming apparatus comprising
a housing defining an elongated microwave heating cavity having electrically conductive walls; -
a printed circuit board separating said cavity lengthwise into first and second cavity sections, said printed circuit board including a fluid impervious, electrically insulating substrate and an elongated conductor run having opposite ends, said conductor run extending along said substrate and facing one of said cavity sections; a fluid inlet into, and a fluid outlet from, said first cavity section so that infusate can flow through said first cavity section and connector means extending into said housing for coupling an external microwave signal of a selected frequency to, and a temperature sensing signal from, one end of said conductor run. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Infusate warming apparatus comprising
a housing defining an elongated microwave heating cavity having electrically conductive wails; -
a printed circuit board separating said cavity lengthwise into first and second cavity sections, said printed circuit board including a fluid impervious, electrically insulating substrate and an elongated conductor mn having opposite ends, said conductor run following a sinuous meandering path along the substrate and facing one of said cavity sections; a fluid inlet into, and a fluid outlet from, said first cavity section so that infusate can flow through said first cavity section, and connector means extending into said housing for coupling an external microwave signal of a selected frequency to one end of said conductor run.
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8. Infusate warming apparatus comprising
a housing defining an elongated microwave heating cavity having electrically conductive walls; -
a printed circuit board separating said cavity lengthwise into first and second cavity sections, said printed circuit board including a fluid impervious, electrically insulating substrate and an elongated conductor run having opposite ends, said conductor run extending along said substrate and facing one of said cavity sections; a fluid inlet into and a fluid outlet from said first cavity section so that fluid can flow through said first cavity section, and conductor means extending into said housing for coupling an external microwave signal of a selected frequency to one end of said conductor run, the other end of said conductor run being connected electrically to said housing.
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9. Infusate warming apparatus comprising
an electrically conductive housing defining an elongated microwave heating cavity having opposite ends; -
a printed circuit board separating said cavity lengthwise into first and second cavity sections, said printed circuit board including a fluid impervious, electrically insulating substrate and an elongated conductor run having opposite ends, said conductor run extending along said substrate and facing one of said cavity sections; a fluid inlet into and a fluid outlet from said first cavity section so that infusate can flow through said first cavity section; connector means extending into said housing for coupling an external microwave signal of a selected frequency to one end of said conductor run; a microwave transmitter producing an output signal having a first frequency; means for coupling the transmitter to said connector means so that the signal from the transmitter provides an energy field which heats the infusate flowing through said first cavity, and a sensor responsive to the temperature of the infusate flowing through said first cavity section and producing a temperature signal. - View Dependent Claims (10, 11, 12)
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13. Infusate warming apparatus comprising
a housing defining an elongated microwave heating cavity having electrically conductive walls; -
a printed circuit board separating said cavity lengthwise into first and second cavity sections, said printed circuit board including an electrically insulating substrate and a conductor run having opposite ends, said conductor run extending along the substrate and facing one of the cavity sections; a fluid inlet into, and a fluid outlet from, said first cavity section, and connector means extending into said housing for coupling to said conductor run an external microwave signal of a selected frequency and from said conductor run a temperature-indicating signal having a different frequency from said selected frequency so that the conductor run and the fluid flowing through the second cavity section constitute a single transmission line. - View Dependent Claims (14, 15, 16, 17)
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Specification