Body temperature logging patch
An actively-powered temperature data logger patch with wireless data communication includes a sealed, flexible battery comprising a printed electrochemical cell with an anode and a cathode, and a flexible circuit including a microprocessor, a temperature sensor configured to sense a temperature of a target subject, a wireless communication transmitter and an antenna. In one example, the temperature sensor is located at a first end of the patch, and the antenna is located at an opposite, second end of the patch. The patch is configured to conform to a curved surface of the target subject and includes an adhesive configured to be removably applied to skin of the patient. An external computing device is capable of receiving communication from the wireless communication transmitter of the patch via an electromagnetic field.
1. An actively-powered temperature data logger patch with wireless data communication, comprising:
a first substrate layer comprising a first end and an opposite second end;
a plurality of sealed, flexible batteries in a parallel arrangement and configured to provide continuous electrical power, each battery comprising a printed electrochemical cell with an anode and a cathode that are provided in a co-planar arrangement and an aqueous electrolyte layer covering and in electrical contact with said anode and cathode;
a flexible circuit comprising a microprocessor, a temperature sensor configured to sense a temperature of a target subject, a wireless communication transmitter and an antenna, the flexible circuit further comprising a plurality of contact pads that are electrically coupled to corresponding contacts of the plurality of flexible batteries to thereby electrically power the microprocessor, wireless communication transmitter, and temperature sensor,
wherein all of the microprocessor, temperature sensor, and wireless communication transmitter actively receive electrical power from the flexible batteries to enable the microprocessor to continuously obtain a plurality of temperature samples from the temperature sensor at a periodic time interval;
a second substrate layer comprising an adhesive configured to be removably applied to a surface of the target subject,
wherein the flexible batteries and flexible circuit are disposed between the first and second substrate layers, and all of the first substrate layer, flexible batteries, flexible circuit, and second substrate layer are sufficiently flexible so that the temperature data logger patch is configured to conform to a curved or variable surface of the target subject and is able to flex and move together with movement of the target subject without degradation of the batteries, circuit, or active operation thereof; and
a switch used to activate the microprocessor to an operational power state and thereby enable said active electrical power to the microprocessor, temperature sensor, and wireless communication transmitter only when a user intends to begin use of the patch.
2. The patch of claim 1 , further comprising a latching power circuit in electrical communication with the switch and the microprocessor, and upon actuation of the switch the latching power circuit enables electrical communication between the plurality of sealed, flexible batteries and the microprocessor to thereby activate the microprocessor from a reduced power state to the operational power state.
3. The patch of claim 1 , wherein the switch is a momentary switch.
4. The patch of claim 1 , wherein the microprocessor is configured to selectively provide electrical power to the temperature sensor only when the microprocessor is obtaining a temperature sample from the temperature sensor.
5. The patch of claim 1 , wherein the wireless communication transmitter utilizes a standard Bluetooth or Bluetooth low-energy communications protocol.
6. The patch of claim 1 , wherein the microprocessor further comprises a timer that actively receives electrical power from the flexible batteries and is configured to enable the microprocessor to obtain temperature samples from the temperature sensor at the periodic time interval, and the microprocessor further comprises a non-transitory memory for storing the temperature samples together with an associated numerical identifier for each temperature sample.