Retractable sealing assembly for a fluid reservoir of a fluid infusion device
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 sealing assembly for a fluid infusion device that cooperates with a fluid reservoir having a hollow fluid reservoir needle, the sealing assembly comprising:
a base plate comprising a needle shroud having an interior and an interior surface;
a hollow fluid delivery needle coupled to the base plate to provide a fluid flow path from the fluid reservoir to a user of the fluid infusion device, wherein at least a portion of the hollow fluid delivery needle is positioned in the needle shroud; and
a sealing component coupled to the base plate and overlying at least a portion of the hollow fluid delivery needle, the sealing component comprising:
a base section;
a retractable body section extending from the base section;
a tip section extending from the retractable body section;
a needle cavity formed in the retractable body section and sized to receive the hollow fluid delivery needle;
a needle opening formed in the tip section to accommodate a tip of the hollow fluid delivery needle when the tip section is retracted over the hollow fluid delivery needle; and
a compression element coupled around the tip section to impart an inward biasing force to the needle opening;
the compression element having an outer surface that is shaped and sized in accordance with the interior of the needle shroud to accommodate concurrent translation of the tip section and the compression element within the interior of the needle shroud, and to maintain a proper orientation of the compression element within the needle shroud such that the needle opening remains axially aligned with the hollow fluid delivery needle during concurrent translation of the tip section and the compression element;
the outer surface of the compression element contacting the interior surface of the needle shroud to form a seal therewith during concurrent translation of the tip section and the compression element;
the compression element providing a first sealing force to seal the needle opening around the hollow fluid delivery needle when the sealing component is in the retracted position; and
the compression element providing a second sealing force to close the needle opening when the sealing component is in an extended position.
2. The sealing assembly of claim 1 , wherein the base section, the tip section, and the retractable body section are integrally formed and continuous with one another.
3. The sealing assembly of claim 1 , wherein:
the needle cavity defines internal relief features of the retractable body section;
the internal relief features facilitate retraction of the sealing component over the hollow fluid delivery needle in response to a longitudinal force applied to the tip section by the hollow fluid reservoir needle; and
the internal relief features cause the tip section to extend over and cover the hollow fluid delivery needle in response to removal of the longitudinal force.
4. The sealing assembly of claim 1 , wherein:
the tip section comprises an outer groove formed therein; and
the compression element engages the outer groove for coupling to the tip section.
5. The sealing assembly of claim 1 , wherein the tip section terminates at a distal end surface that is shaped and sized to receive an end of the hollow fluid reservoir needle.
6. The sealing assembly of claim 1 , wherein:
the sealing component has an extended state and a retracted state;
when in the extended state, the tip of the hollow fluid delivery needle resides within the needle cavity, and the compression element closes the needle opening to inhibit fluid ingress into the needle cavity; and
when in the retracted state, an end section of the hollow fluid delivery needle resides in the needle opening, and the tip of the hollow fluid delivery needle extends from the tip section and into the hollow fluid reservoir needle.
7. A fluid infusion device to deliver a fluid to a user, the fluid infusion device comprising the sealing assembly of claim 1 .
8. The fluid infusion device of claim 7 , wherein the fluid comprises a medication fluid.
9. The fluid infusion device of claim 8 , wherein the medication fluid comprises insulin.
10. A sealing assembly for a fluid infusion device that cooperates with a fluid reservoir having a hollow fluid reservoir needle, the sealing assembly comprising:
a base plate comprising a needle shroud having an interior and an interior surface;
a hollow fluid delivery needle coupled to the base plate to provide a fluid flow path from the fluid reservoir to a user of the fluid infusion device, wherein at least a portion of the hollow fluid delivery needle is positioned in the needle shroud; and
a sealing component coupled to the base plate and overlying at least a portion of the hollow fluid delivery needle, the sealing component comprising:
a base section;
a needle sealing element integrally formed with the base section and extending from a first end of the base section in an extension direction perpendicular to the base section; and
a chamber sealing element configured to seal an outlet fluid chamber of the fluid infusion device, the chamber sealing element integrally formed with the base section and extending from a second end of the base section in the extension direction, the needle sealing element extending further from the base section than the chamber sealing element such that the needle sealing element, the base section, and the chamber sealing element together form a J-shaped component;
the needle sealing element comprising:
a retractable body section extending from the base section;
a tip section extending from the retractable body section;
a needle cavity formed in the retractable body section and sized to receive the hollow fluid delivery needle;
a needle opening formed in the tip section to accommodate a tip of the hollow fluid delivery needle when the tip section is retracted over the hollow fluid delivery needle; and
a compression element coupled around the tip section to impart an inward biasing force to the needle opening;
the compression element having an outer surface that is shaped and sized in accordance with the interior of the needle shroud to accommodate concurrent translation of the tip section and the compression element within the interior of the needle shroud, and to maintain a proper orientation of the compression element within the needle shroud such that the needle opening remains axially aligned with the hollow fluid delivery needle during concurrent translation of the tip section and the compression element;
the outer surface of the compression element contacting the interior surface of the needle shroud to form a seal therewith during concurrent translation of the tip section and the compression element;
the compression element providing a first sealing force to seal the needle opening around the hollow fluid delivery needle when the sealing component is in the retracted position; and
the compression element providing a second sealing force to close the needle opening when the sealing component is in an extended position.