An infusion set comprises a base member ( 60 ), an introducer cap ( 64 ), and an infusion cap ( 54 ). The base member ( 60 ) preferably comprises a soft cannula ( 52 ) extending from a lower side ( 118 ) of the base member ( 60 ), and a port ( 62 ) on an upper side ( 92 ) thereof. The port ( 62 ) is configured to be in fluid communication with the cannula ( 52 ). The port ( 62 ) also comprises a septum ( 130 ) adapted to seal the port ( 62 ) against unwanted fluid flow. The introducer cap ( 64 ) is adapted to be mounted to the base member ( 60 ) and has a needle ( 66 ) adapted to extend through the septum ( 130 ) and said soft cannula ( 52 ) in an assembled position. The infusion cap ( 54 ) comprises a lumen ( 160 ) adapted to receive an elongate flexible tube ( 162 ). The infusion cap ( 54 ) also comprises a hard cannula ( 170 ) adapted to be inserted through the septum ( 130 ) and to place said soft cannula ( 52 ) in fluid communication with said lumen ( 160 ).
1. A base of an infusion set comprising:
A substantially planar member having upper and lower sides;
an adhesive layer attached to the lower side of the planar member;
a base cannula attached to the substantially planar member and extending downwardly below the lower side; and
a port in fluid communication with the base cannula, the port comprising:
an elastomeric septum positioned such that at least a portion of the septum is at or near an opening in the port, the septum being configured for repeated connection and disconnection with a fluid source, and the septum being adapted to inhibit fluid communication through the port, and
a funnel-shaped surface disposed between the septum and base cannula,
wherein the septum has a central region, an upper portion positioned above a bottom surface of the central region, and a lower portion comprising a flange that extends radially outwardly beyond the upper portion and extends downwardly below the bottom surface of the central region,
wherein the lower portion is configured to rest against the funnel-shaped surface, thereby supporting the septum and resisting downward shear when a downward force acts against the septum.
2. The base of claim 1 , wherein the lower portion has a generally frustoconical lower surface.
3. The base of claim 2 , wherein the generally frustoconical lower surface of the lower portion rests against the funnel-shaped section.
4. The base of claim 3 , wherein the funnel-shaped section comprises a funnel-shaped insert.
5. The base of claim 1 , wherein the upper portion is generally cylindrical.
6. The base of claim 1 , wherein the septum further comprises a central depression on an upper side of the septum.
7. The base of claim 1 , wherein the septum comprises a slit.
8. The base of claim 7 , wherein the flange extends inwardly near the slit.
9. The base of claim 1 , wherein the septum is retained in the port by heat staking.
10. The base of claim 1 , wherein the substantially planar member further comprises a rim.
11. The base of claim 1 , wherein the substantially planar member further comprises at least one notch.
12. The base of claim 1 , wherein the base cannula tapers inwardly in a direction moving away from the substantially planar member.
13. The base of claim 1 , wherein the port extends upwardly from the upper side.