Soft cannula subcutaneous injection set

An injection set for injecting a desired fluid from a source of fluid to a subcutaneous delivery location under the skin of a patient, said injection set comprising:

• a holding pad for placement on the skin of a patient at an injection site, said holding pad having an aperture therein;
• a catheter hub mounted on top of said holding pad, said catheter hub having a fluid chamber therein, said catheter hub also having a cylindrical segment extending through said aperture in said holding pad and extending below the bottom surface of said holding pad, said cylindrical segment having an aperture therethrough in communication with said fluid chamber;
• self-sealing means for enclosing said fluid chamber on the top of said catheter hub;
• a flexible cannula having a first end affixed within said catheter hub and a second end which protrudes from said cylindrical segment of said catheter hub, said cannula having a lumen therein extending between said first and second ends, said lumen being in fluid communication with said fluid chamber in said catheter hub;
• a delivery tube having a first end affixed to said catheter hub, said delivery tube being substantially parallel to the skin of the patient as it approaches and is attached to said catheter hub, a second end of said delivery tube being connectable to said source of fluid;
• fluid connection means within said catheter hub for maintaining said first end of said delivery tube in fluid communication with said fluid chamber;
• and
• cannula insertion means for inserting the protruding body portion of the flexible cannula into the subcutaneous fat layer of the skin of the patient as the flat surface of the housing is placed against the skin of the patient.

An injection set for injecting a desired fluid from a source of fluid to a delivery location under the skin and in the subcutaneous fat layer of a patient, comprising:

• a holding pad for placement on the skin of a patient at an injection site, said holding pad having a central portion with an aperture therein from which said soft cannula protrudes, said holding pad also having two wing portions extending from opposite sides of said central portion, said two wing portions being hingeably connected to said central portion by two areas of reduced thickness, thereby enabling said holding pad to fit to the contour rather well;
• a catheter hub mounted on top of said holding pad, said catheter hub having a fluid chamber therein, said catheter hub also having a cylindrical segment extending through said aperture in said holding pad and extending below the bottom surface of said holding pad, said cylindrical segment having an aperture therethrough in communication with said fluid chamber;
• a septum made from a pierceable, resilient, resealable substance, said septum enclosing said fluid chamber on the top of said catheter hub;
• a retaining cap which is affixed to said catheter hub over said septum thereby compressing said septum, said cap having a small aperture therethrough through which said insertion needle may be inserted;
• a flexible tube in fluid communication with the fluid chamber within said catheter hub, said flexible tube exiting out through the side of said catheter hub at an angle substantially parallel to the skin said mounting pad is placed on;
• a soft cannula mounted in and extending from said cylindrical segment of said catheter hub, said soft catheter having a lumen therethrough, said lumen being in fluid communication with said fluid chamber in said catheter hub;
• an insertion needle for removable insertion through said self-sealing means on said top of said catheter hub, said insertion needle passing through said fluid chamber and through said lumen of said soft cannula, said insertion needle having an outside diameter size which tightly fits and passes through the lumen of said soft cannula, a sharpened tip of said insertion needle extending beyond the length of said soft cannula when said insertion needle is fully inserted through said housing, said self-sealing means sealing said top of said catheter hub when said insertion needle is withdrawn therefrom;
• and
• means for removably securing said holding pad to the skin of a patient.