Patent ID: 8796997

Claim:
An apparatus for use with a system for warming a fluid to be administered to a living body, which includes the system including a case through which a fluid line extends, the apparatus comprising: a housing configured for attachment to the case, the housing including: one or more lithium polymer cells; a heater positioned to transfer heat to the case; a fluid warmer microcontroller connected to the heater; a first order battery protection circuit connected to elements selected from4hea group consisting of: a battery condition indicator and controller, at least one sensor connected to at least one of the one or more lithium polymer cells, a cell balance circuit connected to the one or more lithium polymer cells, and a battery disconnect switch; a second order battery protection circuit connected to the one or more lithium polymer cells; a fluid warmer over-temperature protection circuit to sense a temperature of the case during use; and a thermal fuse coupled to the heater, the second order battery protection circuit, and the fluid warmer over-temperature protection circuit, wherein the second order battery protection circuit opens the thermal fuse in response to a predetermined condition, and wherein the fluid warmer over-temperature protection circuit opens the thermal fuse in response to sensing an excessive fluid temperature.