Drug delivery device with indicator
Systems and methods for monitoring an operational state and/or a fill status of a drug container of a drug delivery device are provided. The drug container can hold a liquid drug. A plunger can be positioned within the drug container. A drive system can advance the plunger to expel the liquid drug from the container. A monitoring system can detect a movement and/or a position of the plunger and/or any component coupled to the plunger. The detection can enable determination of an amount of liquid drug that has been expelled and/or an amount of liquid drug remaining in the drug container. Dosing rates, flow rates, and dosage completion can also be determined.
1. A monitoring system, comprising:
a plunger wiper coupled to a plunger positioned within a drug container and operable to travel with the plunger inside the drug container;
a first conductive trace on an interior surface of the drug container;
a second conductive trace positioned adjacent to the first conductive trace on the interior surface of the drug container, wherein the plunger wiper is formed from an electrically conductive material and is positioned to electrically couple the first conductive trace and the second conductive trace; and
a controller electrically coupled to the first conductive trace and the second conductive trace, wherein:
the first conductive trace and the second conductive trace are operable to form a variable resistance network usable by the controller to determine a fill status of the drug container.
2. The monitoring system of claim 1 , wherein:
the first conductive trace and the second conductive trace are operable to contact a liquid drug in the drug container.
3. The monitoring system of claim 2 , wherein the first conductive trace and the second conductive trace are spaced apart and are both coupled to a first pin, and the first pin is electrically coupled to the controller.
4. The monitoring system of claim 1 , wherein the second conductive trace has a sawtooth configuration.
5. The monitoring system of claim 1 , wherein the second conductive trace is formed of a material with a linearly increasing resistance.
6. The monitoring system of claim 1 , wherein the controller is operable to:
detect a resistance value based on a position of the plunger wiper between two conductive pins.
7. A monitoring system, comprising:
a plunger wiper coupled to a plunger positioned within a drug container and operable to travel with the plunger inside the drug container;
a first conductive trace on an interior surface of the drug container;
a second conductive trace positioned adjacent to the first conductive trace on the interior surface of the drug container; and
a controller electrically coupled to the first conductive trace and the second conductive trace, wherein:
the first conductive trace and the second conductive trace are operable to form a variable resistance network usable by the controller to determine a fill status of the drug container; and
wherein the drug container comprises:
a first conductive output pin coupled to the first conductive trace and a first end of the second conductive trace within the drug container.
8. The monitoring system of claim 1 , wherein the drug container further comprises:
a second conductive pin coupled to a second end of the second conductive trace and to a first end of a third conductive trace, wherein:
the second conductive pin extends from an exterior of the drug container into an interior of the drug container, and
the third conductive trace is positioned to be separate from a liquid drug.
9. The monitoring system of claim 8 , wherein the drug container further comprises:
a third conductive pin coupled to a second end of the third conductive trace.
10. A monitoring system, comprising:
a plunger wiper coupled to a plunger positioned within a drug container and operable to travel with the plunger inside the drug container;
a first conductive trace on an interior surface of the drug container;
a second conductive trace positioned adjacent to the first conductive trace on the interior surface of the drug container; and
a controller electrically coupled to the first conductive trace and the second conductive trace, wherein:
the first conductive trace and the second conductive trace are operable to form a variable resistance network usable by the controller to determine a fill status of the drug container; and
wherein the drug container further comprises:
a first conductive output pin coupled to the first conductive trace and a first end of the second conductive trace within the drug container; and
wherein the controller is further configured to:
monitor a resistance value of the variable resistance network, and
determine a position of the plunger based on the monitored resistance value.