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US 11,951,035 B2Granted
Devices, systems and methods for endovascular temperature control
AssigneeZoll Circulation, Inc.
InventorsJeremy Thomas Dabrowiak, Jessica Megan Clayton, John Thomas Buckley, Christo P. Pamichev, Craig Wendell Pendry, Paul Eric Peterson, Richard Allen Smith, Sean W. Yip, John William Jacobsen
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Abstract
Devices, systems and methods for controlling a patient's body temperature by endovascular heat exchange.
Claims19
A body heat exchange system comprising:
- at least one set of thermal exchange plates which warm or cool a heat exchange fluid for delivery to a body surface or endovascular heat exchanger;
- a refrigeration unit for circulating cold refrigerant through at least one thermal exchange plate of said at least one set of thermal exchange plates;
- at least one heater for heating said at least one thermal exchange plate;
- a programmable controller;
- wherein the system further comprises a bypass circuit for alternately circulating hot refrigerant from the refrigeration unit through said at least one thermal exchange plate;
- and
- wherein the controller is programmed to monitor the power output of said at least one heater and, if said power output exceeds a limit, to cause hot refrigerant to flow through the bypass circuit and through said at least one thermal exchange plate, thereby assisting said at least one heater in warming said at least one thermal exchange plate.
4 more elements
A body heat exchange system comprising:
- heater/cooler apparatus for alternately warming or cooling a heat exchange fluid for delivery to a body heat exchange device for surface or endovascular heat exchange in or on a body of a subject;
- a pump for circulating the heat exchange fluid through the body heat exchange device;
- a controller which is programmed to selectively vary both a temperature and a flow rate of the heat exchange fluid to maintain the subject's body temperature at or within a permissible range of a target body temperature,
- wherein the controller is programmed such that, after the body temperature of the subject has been warmed or cooled to the target body temperature, the controller will cause the system to maintain said body temperature at or within a permissible variance range of the target temperature by:
- holding the temperature of the heat exchange fluid constant and varying the operation of the pump to adjust the flow rate of heat exchange fluid through a catheter as needed to maintain said body temperature at or within a permissible variance range of the target temperature so long as the speed of the pump does not exceed a maximum pump speed;
- and
- if the pump exceeds a target pump speed, adjusting the temperature of the heat exchange fluid such that said body temperature is at or within a permissible variance range of the target temperature without exceeding the maximum pump speed.
4 more elements
A body heat exchange system comprising:
- heater/cooler apparatus for alternately warming or cooling a heat exchange fluid for delivery to a body heat exchange device for surface or endovascular heat exchange in or on the body of a subject;
- a pump for circulating the heat exchange fluid through the body heat exchange device;
- a temperature sensor for sensing a temperature of the heat exchange fluid;
- a pressure sensor for sensing a pressure of the heat exchange fluid;
- a controller which receives a maximum pump speed set point and signals from the temperature sensor and pressure sensor, said controller being programmed for to:
- a) establishing current cold/warm status of the heat exchange fluid based on the sensed temperature of the heat exchange fluid;
- b) determining whether operation of the pump at the maximum pump speed set point will cause over-pressurization of the heat exchange fluid or under-pressurization of the heat exchange fluid;
- and
- c) if it is determined that operation of the pump at the maximum pump speed set point will cause over-pressurization of the heat exchange fluid, causing the maximum pump speed set point to change to an adjusted maximum pump speed set point at which the pump may operate without causing over-pressurization of the heat exchange fluid;
- or
- d) if it is determined that operation of the pump at the maximum pump speed set point will cause an under-pressurization of the heat exchange fluid, causing the maximum pump speed set point to change to an adjusted maximum pump speed set point at which the pump may operate without causing under-pressurization of the heat exchange fluid.
8 more elements
Dependencies are inferred from the claim text.