US 7,403,704 B2Granted

Dual heating device and method

AssigneeTerumo Cardiovascular Systems Corporation

InventorsRolando A. Eccleston, Richard M. Matovina

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Abstract

A dual-channel fluid temperature control apparatus controls temperature of cardiac fluids during surgery using power from an electrical convenience outlet having a power limit. A first pump receives a first heat exchange fluid to selectively pump the first heat exchange fluid within a first circulation channel. A second pump receives a second heat exchange fluid to selectively pump the second heat exchange fluid within a second circulation channel. A first heater unit comprises a first plurality of independently actuatable heating elements each having a respective power consumption. A second heater unit comprises a second plurality of independently actuatable heating elements each having a respective power consumption. A controller selectably actuates the first and second pumps and the first and second pluralities of heating elements to selectably heat or cool the first and second heat exchange fluids such that power draw of all activated pumps and heating elements is maintained within the power limit.

Claims14

Dependent claims

A dual-channel fluid temperature control apparatus for controlling temperature of cardiac fluids during surgery using power from an electrical convenience outlet having a power limit, said apparatus comprising:

a first circulation channel for conveying a first heat exchange fluid;
a second circulation channel for conveying a second heat exchange fluid;
a first pump receiving said first heat exchange fluid to selectively pump said first heat exchange fluid within said first circulation channel;
a second pump receiving said second heat exchange fluid to selectively pump said second heat exchange fluid within said second circulation channel;
a first heater unit thermally coupled to said first heat exchange fluid and comprising a first plurality of independently actuatable heating elements each having a respective power consumption;
a second heater unit thermally coupled to said second heat exchange fluid and comprising a second plurality of independently actuatable heating elements each having a respective power consumption;
a cooling bath for selectably thermally coupling to said first and second heat exchange fluids;
and
a controller for selectably actuating said first and second pumps and said first and second pluralities of heating elements to selectably heat or cool said first and second heat exchange fluids such that power draw of all activated pumps and heating elements is maintained within said power limits
wherein the combined power consumption of the first and second pluralities of heating elements together with the power consumption of the controller and the pumps is greater than the power limit, wherein the first plurality of heating elements includes a first individual heating element having a power consumption sufficiently small to enable the controller to maintain it fully on even when at least one of the second plurality of heating elements is fully on without exceeding the power limit, and wherein the second plurality of heating elements includes a second individual heating element having a power consumption sufficiently small to enable the controller to maintain it fully on even when at least one of the first plurality of heating elements is fully on without exceeding the power limit.

7 more elements

A dual channel heat exchange apparatus with first and second channels, said apparatus warming cardiac fluid using power from an electrical convenience outlet having a prescribed power limit, said apparatus comprising:

a first heater in a first channel having independently energizable first and second electrical heating elements;
a second heater in a second channel having independently energizable third and fourth electrical heating elements;
and
first and second fluid pumps for circulating a heat exchange fluid in said first and second channels, respectively, wherein each of said pumps consumes a predetermined power draw when its respective channel is active;
said first and third heating elements selectably providing simultaneous, continuous activation to provide a combined power consumption together with both of said fluid pumps that is substantially equal to said power limit;
said second heating element selectably providing simultaneous continuous activation with said first heating element to provide a combined power consumption with said first heating element and said first fluid pump that is substantially equal to said power limit;
and
said fourth heating element selectably providing simultaneous continuous activation with said third heating element to provide a combined power consumption with said third heating element and said second fluid pump that is substantially equal to said power limit.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/184,200Filed 19 Jul 2005 · us provisional application
Priority: 6 Aug 2004
Published: US 2006/0030917 A19 Feb 2006
Granted: 22 Jul 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

A61F 7/12
Heating or cooling appliances for medical or therapeutic treatment of the human body: devices for heating or cooling internal body cavities
A61M 1/3664
Extra-corporeal blood circuits: for preparing cardioplegia solutions
A61M 5/44
Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning…:…
A61F 7/007
Heating or cooling appliances for medical or therapeutic treatment of the human body: characterised by electric heating