Pressure vented fluid reservoir for a fluid infusion device
View Patent ↗Disclosed herein is a fluid infusion device of the type that delivers medication fluid to the body of a patient. The device includes or cooperates with a fluid reservoir, and the device has a sealing assembly to receive and form a fluid seal with the fluid reservoir. A retractable sealing element surrounding a hollow fluid delivery needle may be used to seal a port of the fluid reservoir. The port may include a pressure vent that is sealed by the retractable sealing element. In one variation, the reservoir includes a moving valve sleeve that holds a septum. The septum moves to allow the reservoir to vent, and to form a seal with the port when the needle pierces the septum. In another variation, the device includes a needleless sealing assembly. In yet other variations, the device uses a needled fluid reservoir.
1. A fluid infusion device that delivers a medication fluid to a body, the fluid infusion device comprising:
a base plate;
a hollow fluid delivery needle coupled to the base plate to provide a fluid flow path for the medication fluid;
a sealing element coupled to the base plate and overlying at least a portion of the hollow fluid delivery needle, the sealing element comprising:
a base section;
a tip section extending from the base section; and
a retractable body section between the base section and the tip section; and
a fluid reservoir comprising:
a main body section that defines a fluid chamber for the medication fluid;
a fluid delivery port coupled to and extending from the main body section, the fluid delivery port comprising a fluid conduit and a pressure vent defined therein;
a funnel element associated with the fluid delivery port, wherein the pressure vent is formed in the funnel element; and
a septum located in the fluid delivery port and having a nominal non-pierced state forming a fluid seal within the fluid conduit;
wherein the pressure vent provides a venting conduit from inside the fluid chamber to outside the fluid chamber; and
wherein the pressure vent terminates at an exterior surface of the fluid delivery port, the exterior surface contoured to mate with a resilient sealing element of the fluid infusion device to seal the pressure vent.
2. The fluid infusion device of claim 1 , wherein:
the sealing element has a nominal state and a retracted state;
when in the nominal state, a tip of the hollow fluid delivery needle is covered by the sealing element; and
when in the retracted state, the tip of the hollow fluid delivery needle extends from the tip section of the sealing element.
3. The fluid infusion device of claim 1 , wherein the pressure vent comprises a plurality of vent holes arranged around a perimeter of the fluid delivery port.
4. The fluid infusion device of claim 1 , wherein:
the funnel element comprises a tapered interior surface; and
the tip section of the sealing element comprises a tapered exterior surface to mate with the tapered interior surface of the funnel element.
5. The fluid infusion device of claim 1 , wherein the hollow fluid delivery needle pierces the septum to facilitate delivery of the medication fluid from the fluid chamber to the hollow fluid delivery needle.
6. The fluid infusion device of claim 5 , wherein, during installation of the fluid reservoir, the tip section of the sealing element seals the pressure vent before the hollow fluid delivery needle pierces the septum.
7. A fluid reservoir for a fluid infusion device that delivers a medication fluid to a body, the fluid reservoir comprising:
a main body section that defines a fluid chamber for the medication fluid;
a fluid delivery port coupled to and extending from the main body section, the fluid delivery port comprising a fluid conduit and a pressure vent defined therein;
a funnel element associated with the fluid delivery port, wherein the pressure vent is formed in the funnel element; and
a septum located in the fluid delivery port and having a nominal non-pierced state forming a fluid seal within the fluid conduit;
wherein the pressure vent provides a venting conduit from inside the fluid chamber to outside the fluid chamber; and
wherein the pressure vent terminates at an exterior surface of the fluid delivery port, the exterior surface contoured to mate with a resilient sealing element of the fluid infusion device to seal the pressure vent.
8. The fluid reservoir of claim 7 , wherein the medication fluid comprises insulin.
9. The fluid reservoir of claim 7 , wherein the pressure vent comprises a plurality of vent holes located around an outer perimeter of the septum.
10. The fluid reservoir of claim 7 , wherein:
the funnel element comprises a tapered interior surface; and
the sealing element comprises a tapered exterior surface to mate with the tapered interior surface of the funnel element.
11. The fluid reservoir of claim 7 , further comprising a filling port in fluid communication with the fluid chamber to accommodate filling of the fluid chamber with the medication fluid.