Automated reservoir fill system
View Patent ↗An automated reservoir filling system for a portable medical device is disclosed. The system includes a vial sealed by a septum partially filled with a liquid and a gas occupying a headspace. The system further includes a reservoir with a volume defined between a reservoir septum and a plunger head. The plunger head is coupled to a plunger arm which is further coupled to a drive system. Further included is a transfer system with a vial end that pierces the vial septum and remains in contact with the liquid, and a reservoir end that pierces the reservoir septum and remains in the reservoir volume. A controller coupled to the drive system to actuates the drive system automatically drawing fluid from the vial to the reservoir through the degas system.
1. A system to automatically fill a reservoir for a portable medical device comprising:
a vial having a vial volume partially filled with a liquid and a gas, the gas occupying a headspace, the vial further having a vial port sealed with a vial septum;
a reservoir having a reservoir volume defined between a reservoir port and a plunger head, the plunger head coupled to a plunger arm, the plunger arm coupled to a drive system defined to move the plunger arm within a chamber, the reservoir port being sealed by a reservoir septum;
a first degas system having a temperature system to elevate the liquid temperature before the liquid enters the reservoir;
a second degas system having a valve end coupled to a check valve, the second degas system further having a headspace end defined to pierce the vial septum, the headspace end being positioned in the headspace, the check valve further being coupled to a vacuum system;
a transfer system having a vial end defined to pierce the vial septum and remain in contact with the liquid, the transfer system further having a reservoir end defined to pierce the reservoir septum and remain in the reservoir volume;
a controller coupled to the drive system, and the second degas system, the controller defined to actuate the second degas system to automatically draw a partial vacuum within the vial for a period of time before the drive system is automatically actuated to draw the fluid from the vial to the reservoir.
2. A system as defined in claim 1 requiring no electrical power, wherein the controller, the first degas system, the second degas system and the drive system are entirely mechanical systems.
3. A system as defined in claim 2 , wherein the first degas system is defined as a pathway calculated to increase the temperature of the fluid by a maximum amount via friction.
4. A system as defined in claim 2 , wherein the first degas system is defined as a pathway with varying cross-sectional area to induce a maximum change of temperature of the fluid.
5. A system as defined in claim 1 further comprising:
a power source and heating elements incorporated into the first degas system.
6. A system as defined in claim 5 , wherein the first degas system is defined as a pathway calculated to increase the temperature of the fluid by a maximum amount via heat exchange from operation of the heating elements
7. A system as defined in claim 5 , wherein the power source further powers a feedback system associated with the controller, the feedback system having a temperature sensor that determines the fluid temperature in the vial.
8. A system as defined in claim 7 , wherein the heating elements are defined along a pathway calculated to increase the temperature of the fluid by a maximum amount via friction, the heating elements being activated when the feedback system determines that fluid heating in addition to friction heating is required to properly degas the fluid.
9. A system as defined in claim 5 , wherein the heating elements are defined along a pathway calculated to increase the temperature of the fluid by a maximum amount via a change in cross-sectional area, the heating elements being active when the feedback system determines that fluid heating in addition to the maximum change via change in cross-sectional area is required to properly degas the fluid.
10. A system as defined in claim 5 , wherein the system further powers a vibration generation device, such that activation of the vibration generation device degases the fluid within the vial.