Abstract: A device for maintaining functionality in a device reliant on active biocatalysts. A sensor has a biological catalyst, a buffered gel, and a detector component. The gelling component of the buffered gel can be adjusted to function as a barrier or semi-permeable membrane to keep the enzyme active longer. Experimental results show that the invention can sustain device activity for at least 5 days, which is normally only active for up to 1 day.

Abstract: Verification of biosensor data by determining a tamper event. The tamper event can be detected as any event which attempts to spoof the system by obtaining incorrect or improper readings. One verification obtains a known image of the user and compares that with an image of the user which is taken at a time that the biosensor is placed in contact with the user skin. A similarity score between the known image and the taken image can be obtained, and a tamper alert generated when the similarity score is not sufficiently high to indicate a match.

Abstract: Maintaining functionality in a device reliant on active biocatalysts. A water-impermeable container has one or more biocatalysts mixed and packed with stabilizers to function as a slow-release device. Depending on its adjustable geometries the device will provide a modifiable trickle of biocatalysts into a liquid released from a dry and stable state.

Abstract: A means of detecting skin proximity of a wearable comprising: at least two skin proximity sensors, a controller and a transmitter. The proximity sensors can be arranged around a central biosensor to detect tamper attempts. The sensors can be strapped to a person's skin by means of a strap and further sealed on the skin by means of a bioadhesive. Signals from the proximity sensor can be processed by the controller and a ratio baseline obtained. Any appreciable deviations from unity will indicate a tampering event, such as device removal, sensor blockage or sabotage. Results of proximity sensing can be reported to the wearer by means of a monthly calendar, or a daily calendar view in a wearable device.