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1. WO2021067630 - DUAL-CHANNEL HEATING AND COOLING APPARATUS AND METHOD

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims:

1. A system for controlling blood temperature during cardiosurgery comprising:

a cardioplegia circulation channel containing blood or cardioplegia liquid, including a first liquid pump for cardioplegia temperature control, and a blood oxygenator circulation channel containing blood or other liquid, including a second liquid pump for blood oxygenator temperature control independent of the cardioplegia circulation channel;

a cardioplegia heater in heat exchange relationship with the cardioplegia circulation channel, and a blood oxygenator heater in heat exchange relationship with the blood oxygenator circulation channel;

a coolant reservoir configured for holding a liquid and ice, in liquid communication independently with the cardioplegia circulation channel and the blood oxygenator circulation channel, and including a refrigerant system for extracting heat from the liquid in the coolant reservoir;

a power supply connected to each of the first liquid pump, the second liquid pump, the cardioplegia heater, the blood oxygenator heater, and the refrigerant system, and configured to draw a system electrical current from a standard mains outlet; and

a controller including programming for delivering power independently to the first liquid pump, the second liquid pump, the cardioplegia heater(s), the blood oxygenator heater, and the refrigerant system, wherein controller controls the operation of the refrigerant system, the cardioplegia heater, and the blood oxygenator heater to maintain the system electrical current to less than the maximum electrical current target that the standard electrical (mains) outlet is configured to draw.

2. The system according to Claim 1, further including a cold booster flow pump for recirculating the liquid within the coolant reservoir.

3. The system according to Claim 1, wherein the programming is configured to turn off the power to the refrigerant system whenever a priority instruction is received that includes powering the cardioplegia heater.

4. The system according to Claim 3, wherein the priority instruction further includes the powering the blood oxygenator heater.

5. The system according to Claim 1, wherein the programming is configured to turn off the power to the refrigerant system whenever a priority instruction is received that includes powering the blood oxygenator heater.

6. The system according to Claim 1, wherein the cardioplegia heater including a main heater element and a secondary heater element, each independently powered by the power supply and controlled by the controller.

7. The system according to any one of Claims 1 through 6, wherein the refrigerant system is configured to not operate, or to shut off, when the liquid within a reservoir of the cardioplegia heater is below a cardioplegic target hold temperature, and heating by either or both the cardioplegia heater and the blood oxygenator heater are required .

8. The system according to any one of Claims 1 through 6, wherein the refrigerant system may be configured to operate when the liquid within a reservoir of the cardioplegia heater is at or above a cardioplegic target hold temperature, and the blood oxygenator heater is required.

9. The system according to any one of Claims 1 through 6, wherein the refrigerant system is configured to not operate, or to shut off, when a sufficient quantity of ice has formed on or around a coolant coil disposed within the coolant reservoir.

10. The system according to any one of Claims 1 through 6, wherein the controller unit is configured to operate the refrigerant system unless the current drawn by the refrigerant system will result in the system electrical current exceeding the maximum electrical current target.

11. The system according to Claim 1, wherein the cardioplegia heater includes a reservoir for holding a quantity of heated liquid, and when the liquid within the reservoir of the cardioplegia heater is below a cardioplegic target temperature range the cardioplegia heater unit is powered with electrical current to heat the water within the reservoir of the cardioplegia heater, and the cooling compressor unit may optionally operate unless the current drawn by the refrigerant system will result in the system electrical current exceeding the maximum electrical current target.

12. The system according to any one of Claims 1-6, wherein the controller is configured and selected to operate the dual channel heating and cooling system in a full automatic mode.

13. The system according to any one of Claims 1-6, wherein the controller is configured and selected to operate the dual channel heating and cooling system is an automatic mode with a user-selectable offset in the temperature control of the heat exchange liquid passing through the blood-oxygenator.

14. A water heating device useful in a blood perfusion system used during cardiac surgery, that can be used for disinfecting a supply of water contained within a water circulation channel during a non-surgical time period or as surgery is underway, the water heating device including a closed elongated container having an inlet end having a water inlet port, and an outlet end having a water outlet port, a flow pathway for a supply of water flowing from the water inlet port to the water outlet port, and a UV lamp configured to emit UV light, contained and positioned within the water heating device to illuminate with UV light the mass of water contained within the water heating device.

15. The water heating device according to Claim 14, further including a reflector for directing the light output of the UV lamp along the flow pathway.

16. The water heating device according to Claim 14 or Claim 15, the UV lamp configured for control by the controller to be electrically de-energized while the water circulation channel is connected to a patient.

17. A method for sanitizing the water in the water system of a dual-channel, heating and cooling apparatus, while the apparatus is not connected to a patient during a surgical procedure, comprising the steps of:

1) re-circulating a supply of water in a first circulation channel including a water heating device and at least one of a cardioplegia heat exchanger, or a replacement connector therefore, and a blood oxygenator heat exchange, or a replacement connector therefore ;

2) heating the re-circulating supply of water with water heating device to an elevated temperature, to facilitate optimum sanitization of the first circulation channel;

3) irradiating the supply of water at the elevated temperature with UV light from a UV lamp positioned in a portion of the first circulation channel within a flow pathway of the mass of water being re-circulated through the first circulation channel, and

4) re-circulating the UV irradiated supply of water through the first circulation channel, at the elevated temperature and for a period of time, sufficient to destroy or inhibit bacteria within the re-circulating supply of water.

18. The method according to Claim 17 further including re-circulating the supply of water through a cooling water reservoir in fluid communication with the first circulation channel.

19. The method according to Claim 17 or Claim 18 wherein the sanitizing temperature of the water is up to about 41°C.

20. A cooling water reservoir that includes a container having a floor and a sidewall, a refrigerant coil in coolant communication with a refrigerant system comprising a coolant compressor, the refrigerant coil comprising a plurality of tube segments, where the plurality of tube segments are spaced across the floor to provide uniform spacing of the tube segments from one another.

21. The cooling water reservoir according to Claim 20 wherein the uniform spacing of the tube segments maximizes the transfer of heat between a recirculating cooling water contained within the tank with a layer of ice that builds-up on an outer surface of the plurality of tube segments of the refrigerant coil.

22. The cooling water reservoir according to Claim 20 or Claim 21, further including a thermometer probe extending from the sidewall into the volume of the container, and into a space proximate a center of a gap between at least two tube segments of the refrigerant coil, the thermometer probe including a sensor configured to detect a temperature of the recirculating cooling water within the container.

23. The cooling water reservoir according to Claim 22, wherein the sensor is configured to detect a temperature of a thickened layer of ice formed on said outside surfaces of said at least two adjacent tube segments of the refrigerant coil, and where the controller is configured to receive the temperature of the thickened layer of ice, and to determine that said thickened layers of ice is proximate to bridging said gap between at least two adjacent tube segments of the refrigerant coil, and optionally providing a control signal to unpower the coolant compressor to stop the further formation of said thickened layers of ice.

24. The cooling water reservoir according to Claim 20, further including a means for manually shut off the compressor unit.