Electronically-controlled heating device for infusion liquids
First Claim
1. A device for heating infusion liquid, such as instillation liquid and blood transfusion liquid, to be injected to a human body, comprising:
- a casing having an open top and a closed bottom, with an inlet cutout section and an outlet cutout section formed on one side wall thereof;
a liquid heating bag removably mounted within said casing and having an inlet end for connection to a source of liquid, an outlet end for connection to a human body, and a flow passage extending between said inlet and outlet ends in a zigzag line, said heating bag being disposed within said casing with said inlet and outlet ends received in said inlet and outlet cutout sections of said casing, respectively;
a first and a second heating plate mounted on the bottom of said casing, said first heating plate being adapted to heat a half part of the bag on the inlet side of said heating bag, and said second heating plate being adapted to heat the other half part of the bag on the outlet side of said heating bag;
an openable cover connected to the top of said casing in coextensive relation thereto;
a push plate mounted on the inner surface of said cover and adapted to hold said heating bag against said first and second heating plates;
a first thermosensor located within said casing between said inlet cutout section and said first heating plate to measure temperature in the vicinity of the inlet of the bag;
a second thermosensor located within said casing between said first heating plate and said second heating plate to measure temperature in the vicinity of the middle of the bag;
a third thermosensor located within said casing between said second heating plate and said outlet cutout section to measure temperature in the vicinity of the outlet of the bag; and
control means located within said casing for controlling heating rates of said first and second heating plates, said control means including means for controlling said first heating plate in accordance with the temperature of the liquid in the vicinity of the inlet of the bag and the middle of the bag, as measured by said first and second thermosensors, respectively, and said control means further including means for controlling said second heating plate in accordance with the temperature of the liquid in the vicinity of the outlet of the bag, as measured by said third thermosensor.
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Accused Products
Abstract
A device for heating an infusion liquid to be injected into a human body includes a casing having an open top and a closed bottom, with a liquid inlet section and a liquid outlet section, providing a compartment receiving a heating bag providing flow passage for the liquid to be heated. Two heating plates are mounted on the casing bottom and three thermosensors are provided; the first at the inlet section, the second between the heating plates and the third at the outlet section. A cover closing the open top is provided with a push plate holding the bag against the heating plates. A control circuit controls the first heating plate in response to the temperature in the vicinity of the bag inlet and the middle of the bag as detected by the first and second thermosensors and the second heating plate in accordance with the temperature in the vicinity of the bag outlet as detected by the third thermosensor. The control circuit is also responsive to a flow rate detector. The casing orients the heating plates and push plate vertically during use and the push plate and heating plates may be provided with opposed wedged-shaped ridges causing the flow passage in the bag to assume a shape which reduces bubble formation and promotes rapid ejection of any bubble formed.
235 Citations
5 Claims
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1. A device for heating infusion liquid, such as instillation liquid and blood transfusion liquid, to be injected to a human body, comprising:
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a casing having an open top and a closed bottom, with an inlet cutout section and an outlet cutout section formed on one side wall thereof; a liquid heating bag removably mounted within said casing and having an inlet end for connection to a source of liquid, an outlet end for connection to a human body, and a flow passage extending between said inlet and outlet ends in a zigzag line, said heating bag being disposed within said casing with said inlet and outlet ends received in said inlet and outlet cutout sections of said casing, respectively; a first and a second heating plate mounted on the bottom of said casing, said first heating plate being adapted to heat a half part of the bag on the inlet side of said heating bag, and said second heating plate being adapted to heat the other half part of the bag on the outlet side of said heating bag; an openable cover connected to the top of said casing in coextensive relation thereto; a push plate mounted on the inner surface of said cover and adapted to hold said heating bag against said first and second heating plates; a first thermosensor located within said casing between said inlet cutout section and said first heating plate to measure temperature in the vicinity of the inlet of the bag; a second thermosensor located within said casing between said first heating plate and said second heating plate to measure temperature in the vicinity of the middle of the bag; a third thermosensor located within said casing between said second heating plate and said outlet cutout section to measure temperature in the vicinity of the outlet of the bag; and control means located within said casing for controlling heating rates of said first and second heating plates, said control means including means for controlling said first heating plate in accordance with the temperature of the liquid in the vicinity of the inlet of the bag and the middle of the bag, as measured by said first and second thermosensors, respectively, and said control means further including means for controlling said second heating plate in accordance with the temperature of the liquid in the vicinity of the outlet of the bag, as measured by said third thermosensor. - View Dependent Claims (2, 3)
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4. A device for heating infusion liquid such as instillation liquid and blood transfusion liquid to be injected to a human body, comprising:
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a casing having an open top and a closed bottom, said casing having an inlet cutout section and an outlet cutout section formed on one side wall thereof and having a plurality of through holes formed in the opposite side walls thereof; a liquid heating bag removably mounted within said casing and having an inlet end for connection to a source of liquid, an outlet end for connection to a human body, and a flow passage extending between said inlet and outlet ends in a zigzag line, said heating bag being disposed within said casing with said inlet and outlet ends received in said inlet and outlet cutout sections of said casing, respectively; a heating plate mounted on the bottom of said casing and having a groove formed thereon along the portion contacting the liquid passage of said heating bag, said groove having extension ends defining passages connected in air flow communication with said through holes of said casing, said groove and extension ends serving to evacuate air between said heating bag and said heating plate, for improving heat exchange therebetween; an openable cover connected to the top of said casing in coextensive relation thereto; and a push plate mounted on the inner surface of said cover and adapted to hold said heating bag against said heating plates.
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5. A device for heating infusion liquid, such as instillation liquid and blood transfusion liquid, to be injected to a human body, comprising:
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a casing having an open top and a closed bottom, with an inlet cutout section and an outlet cutout section formed on one side wall thereof; a liquid heating bag removably mounted within said casing and having an inlet end for connection to a source of liquid, an outlet end for connection to a human body, and a flow passage extending between said inlet and outlet ends in a zigzag line, said heating bag being disposed within said casing with said inlet and outlet ends received in said inlet and outlet cutout sections of said casing, respectively; a heating plate mounted on the bottom of said casing; an openable cover connected to the top of said casing in coextensive relation thereto; and a push plate mounted on the inner surface of said cover and adapted to hold said heating bag against said heating plate; said casing supporting said heating bag and said heating plate in a substantially vertical orientation during use, with said inlet end above said outlet end; said heating plate and said push plate being formed on their opposed surfaces with ridges having a wedge shape, each of said ridges having an inclined surface protruding, during use, downwardly and inwardly toward said heating bag, the ridges on said heating plate and said push plate causing deformation of the flow passage of said heating bag mounted therebetween, the passage assuming a shape in cross section, during use, having a greater thickness at its upper portions.
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Specification