Flanged sealing element and needle guide pin assembly for a fluid infusion device having a needled fluid reservoir

A sealing assembly for a fluid infusion device that cooperates with a fluid reservoir having a reservoir port and a hollow fluid reservoir needle at least partially located within the reservoir port, the sealing assembly comprising:

• a base plate;
• a reservoir port receptacle on the base plate to receive the reservoir port, and the reservoir port receptacle comprising a proximal end, a distal end extending from the proximal end, and a needle entry formed in the distal end to receive the hollow fluid reservoir needle;
• a flow base component coupled to the base plate and to the reservoir port receptacle, the flow base component comprising an inlet structure extending therefrom to define a fluid chamber, and the flow base component further comprising a needle guide pin protruding therefrom, wherein an end section of the needle guide pin is sized to fit within the hollow fluid reservoir needle;
• and
• a needle sealing element comprising a proximal flange adjacent to the inlet structure, a distal flange opposite the proximal flange, a neck section between the proximal flange and the distal flange, and a needle opening extending through the neck section, wherein the needle sealing element is positioned within the reservoir port receptacle such that the neck section surrounds the end section of the needle guide pin.

A fluid infusion device to deliver a medication fluid to a user, the fluid infusion device comprising:

• a removable fluid reservoir comprising a reservoir port and a hollow fluid reservoir needle;
• a base plate comprising a reservoir port receptacle to receive the reservoir port and the fluid reservoir needle;
• an inlet structure located in the reservoir port receptacle, the inlet structure defining at least a portion of a fluid chamber;
• a needle guide pin protruding from the inlet structure, wherein an end section of the needle guide pin is sized to fit within the hollow fluid reservoir needle;
• and
• a needle sealing element comprising a base section adjacent to the inlet structure, an end section opposite the base section, a neck section between the base section and the end section, and a needle opening extending through the neck section;
• wherein:
• when the reservoir port is engaged with reservoir port receptacle, the end section of the needle guide pin resides within the hollow fluid reservoir needle, a portion of the hollow fluid reservoir needle resides within the needle opening, and the needle sealing element forms a first seal around an exterior surface of the hollow fluid reservoir needle;
• and
• when the reservoir port is disengaged from the reservoir port receptacle, the hollow fluid reservoir needle is decoupled from the sealing component, a portion of the end section of the needle guide pin resides within the needle opening, and the needle sealing element forms a second seal around an exterior surface of the needle guide pin.