Meal detection devices and methods
Devices and methods for detecting meal intake are disclosed herein. In some embodiments, one or more sensors can be used to detect or monitor physiological parameters of a user (e.g., heart rate, body movements, temperature, pH, impedance, gastric stretch, sound emissions, and the like). The outputs of the sensors can be received by a computer system configured to analyze the sensor data and make a determination as to whether meal intake has occurred or is presently occurring. The computer system's determination can be used to trigger, modulate, or otherwise control one or more therapeutic devices. Other types of devices can also be controlled using this determination, such as monitoring or logging devices.
1. A meal detection method, comprising:
measuring impedance across one or more portions of a user using an impedance sensor;
sensing movement of one or more portions of a user using an accelerometer;
using a processor in communication with the impedance sensor and the accelerometer, analyzing outputs of the impedance sensor and the accelerometer to detect meal intake by the user; and
automatically triggering a controlled device to deliver a therapy to the user in response to meal intake detected by the processor.
2. The method of claim 1 , further comprising using the processor to calculate an impedance sensor index, an impedance sensor threshold value, an accelerometer index, and an accelerometer threshold value.
3. The method of claim 2 , further comprising using the processor to determine that solid meal intake occurred when the impedance sensor index exceeds the impedance sensor threshold value.
4. The method of claim 2 , further comprising using the processor to determine that liquid meal intake occurred when the impedance sensor index does not exceed the impedance sensor threshold value and the accelerometer index exceeds the accelerometer threshold value.
5. The method of claim 2 , further comprising using the processor to determine that no meal intake occurred when the impedance sensor index does not exceed the impedance sensor threshold value and the accelerometer index does not exceed the accelerometer threshold value.
6. The method of claim 1 , further comprising using the processor to calculate an accelerometer index based on the total energy of the accelerometer output in a frequency band of interest.
7. The method of claim 1 , further comprising using the processor to calculate an impedance sensor index based on the median energy of the impedance sensor output in a frequency band of interest.