System and techniques for drug reservoir volume detection
Reservoir systems with improved wake up and fill volume detection techniques are provided. An example reservoir system may include a flexible reservoir and electrical components for detecting fill volume of the flexible reservoir without adversely affecting performance of the flexible reservoir when receiving or dispensing a liquid drug.
1. A system, comprising:
a flexible reservoir;
a pair of electrical contact elements operable to contact one another when the flexible reservoir is empty;
a fluid path component coupled to the flexible reservoir; and
a controller component coupled to the electrical contact elements.
2. The system of claim 1 , wherein the pair of electrical contact elements include:
a first clamp component positioned under the flexible reservoir; and
a second clamp component positioned over the flexible reservoir.
3. The system of claim 2 , wherein the controller component is operable to:
detect a capacitance between the first and second clamp components when the flexible reservoir is filled with a first amount of the liquid;
use the detected capacitance to determine a distance between the first and second clamp components; and
determine a fill volume of the flexible reservoir based the determined distance.
4. The system of claim 2 , wherein the second clamp component positioned over the flexible reservoir is operable to move as the flexible reservoir fills.
5. The system of claim 4 , wherein the second clamp component is further operable to move away from the first clamp component.
6. The system of claim 2 , wherein the first clamp component and the second clamp component are coupled together by one or more springs.
7. The system of claim 2 , wherein the second clamp component contacts the first clamp component at an outer portion of the second clamp component.
8. The system of claim 1 , wherein a portion of the fluid path component extends into an interior of the flexible reservoir.
9. The system of claim 1 , wherein the fluid path component is operable to enable a fluid to enter or exit the reservoir.