Lithium polymer battery powered intravenous fluid warmer
First Claim
1. Apparatus for warming a fluid, the apparatus comprising:
- a first conductive path from an external power source to a heater;
a second conductive path from a battery to the heater;
a third conductive path from the first conductive path to a charger, wherein the charger is coupled to the battery through a fourth conductive path, where at least one portion of the second conductive path is not common with the first, third and fourth conductive paths and the at least one portion is only used for discharge current to the heater;
a first order battery protection circuit, coupled to at least one sensor and a battery disconnect switch located between the third and fourth conductive paths, for disconnecting the battery from the charger in response to a first predetermined condition;
a second order battery protection circuit, coupled to the at least one sensor and a thermal fuse located between the first and second conductive paths, for opening the thermal fuse in response to a second predetermined condition; and
a fluid warmer over temperature protection circuit, coupled to the thermal fuse, for opening the thermal fuse in response to excessive fluid temperature.
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Accused Products
Abstract
A lithium polymer (LiPo) battery pack having LiPo battery cells is provided which includes battery protection circuitry, charging circuitry, cell balancing circuitry, and control and communication circuitry. The batteries can be charged while in use by an internal charger. Battery charging and discharging are accomplished in a controlled and protected manner to avoid overcharging and overdischarging conditions. The novel battery pack has built-in safeguards against dangerous LiPo battery conditions and is implemented in a small, portable unit which contains the battery cells, control and protection circuitry, internal charger and display gauge. The battery pack is useful for powering an intravenous fluid warmer or other medical or electrical devices and equipment.
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Citations
17 Claims
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1. Apparatus for warming a fluid, the apparatus comprising:
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a first conductive path from an external power source to a heater; a second conductive path from a battery to the heater; a third conductive path from the first conductive path to a charger, wherein the charger is coupled to the battery through a fourth conductive path, where at least one portion of the second conductive path is not common with the first, third and fourth conductive paths and the at least one portion is only used for discharge current to the heater; a first order battery protection circuit, coupled to at least one sensor and a battery disconnect switch located between the third and fourth conductive paths, for disconnecting the battery from the charger in response to a first predetermined condition; a second order battery protection circuit, coupled to the at least one sensor and a thermal fuse located between the first and second conductive paths, for opening the thermal fuse in response to a second predetermined condition; and a fluid warmer over temperature protection circuit, coupled to the thermal fuse, for opening the thermal fuse in response to excessive fluid temperature. - View Dependent Claims (2, 3, 4, 5)
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6. A battery pack for a fluid warmer, comprising:
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a plurality of lithium polymer cells; a charger connected to the plurality of lithium polymer cells; a spread spectrum oscillator, connected to the charger, for providing a waveform having low electromagnetic interface characteristics; a first order battery protection circuit, coupled to at least one sensor and a battery disconnect switch, for disconnecting the battery from the charger in response to a first predetermined condition; a second order battery protection circuit, coupled to the at least one sensor and a thermal fuse, for opening the thermal fuse in response to a second predetermined condition; and a fluid warmer over temperature protection circuit, coupled to the thermal fuse, for opening the thermal fuse in response to excessive fluid temperature. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification