Abstract: A catheter, which can be used in infusion therapy, includes a catheter tube having a main lumen and at least one secondary lumen. The main lumen and the at least one secondary lumen are each elongate between a proximal tube end and a distal tube end. The at least one secondary lumen has a lateral opening arranged between the proximal tube end and the distal tube end in an axial direction of the catheter tube. The lateral opening extends through a tube casing of the catheter tube in a radial direction of the catheter tube. A seal is introduced into the at least one secondary lumen distally behind the lateral opening and at least partially seals the secondary lumen. The seal is formed from a sealing compound cured in the at least one secondary lumen or a thermoplastic elastomer material expanded within the at least one secondary lumen.

Abstract: A catheter arrangement includes a catheter tube with a lumen. The lumen has a proximal end, a distal end, and at least one supply line. The supply line has a distal end and a proximal end. During a method of production, the distal end of the supply line is connected in a fluid-conducting manner to the proximal end of the lumen. The fluid-conducting connection between the supply line and the lumen can be brought about by a fluid-tight joining connection between the distal end of the supply line and the proximal end of the lumen. The catheter arrangement can be used in infusion therapy.