Manufacturing method a structural part with a cannula, a cannula, a structural part, an insertion head and an insertion device with the cannula
View Patent ↗A method for manufacturing a structural part with a cannula for the subcutaneous administration of an active substance is disclosed. A loose cannula is threaded on a piercing means to form a ready-to-use cannula piercing unit and subsequently, a cannula housing is injection-molded onto the cannula. Embodiments for the cannula as well as the structural part, an application part, an insertion head, and an insertion device which includes the cannula are also disclosed.
1. A method for manufacturing a structural part for a subcutaneous administration of an active substance, said method comprising:
providing a cannula having an end area that deviates from a shape of a rest of a cannula area;
providing a piercing needle;
threading the cannula on the piercing needle, wherein after threading the cannula on the piercing needle a part of the piercing needle protrudes from the end area of the cannula; and
subsequently, injection-molding a cannula housing onto the end area of the cannula, and onto an area of the part of the piercing needle protruding from the end area of the cannula that is adjacent to the end area of the cannula.
2. The method according to claim 1 , wherein the piercing needle has a tip; and wherein for threading the cannula on the piercing needle, the tip of the piercing needle is inserted into the end area of the cannula.
3. The method according to claim 1 , wherein for injection-molding the cannula housing onto the end area of the cannula and the adjacent area of the piercing needle protruding from the end area of the cannula, the injection-molding is performed in such a manner that the piercing needle movably penetrates the cannula housing.
4. The method according to claim 1 , wherein the injection molding of the cannula housing defines a support lug; and said method further comprising inserting a septum element on an end side of the piercing needle after the injection molding of the cannula housing; and arranging the septum element in the support lug of the cannula housing.
5. The method according to claim 4 , wherein arranging the septum element in the support lug of the cannula housing is via thermally flanging the septum element into the support lug.
6. The method according to claim 4 , further comprising attaching a holding device on the end side of the piercing needle after inserting the septum element.