Injection-molded hose

A dispensing cassette for a peristaltic pump without a hose bed, said cassette comprising:

• a first cartridge and second cartridge that are each configured to be mounted onto a peristaltic pump without a hose bed;
• a plurality of one-piece, injection molded hoses (11) each mounted to the first cartridge and to second cartridge in parallel for placement in the peristaltic pump and for stretching over a rotor of the peristaltic pump and conveying a medium by external mechanical deformation of the respective hose by the rotor without pressing the hose against a wall,
• each said hose (11) having a length of less than or equal to 200 mm between its ends;
• and
• each of the hoses having a first thickening (13) and a second thickening (13′), wherein the first thickening and the second thickening of each hose are formed integrally with an outer surface of the respective hose and are located proximate to a respective end of the hose (11), wherein each hose including its first thickening and its second thickening are integrally formed of the same material, whereby when each hose is in a pretensioned state the first thickening and the second thickening are spaced apart at a fixed distance and the fixed distance between the thickenings is between 40 mm and 100 mm, and the ends of the hose extend beyond the respective thickenings;
• wherein said first thickening for each hose is attached to the first cartridge and said second thickening for each hose is attached to the second cartridge, such that the plurality of hoses are attached in parallel between the first cartridge and the second cartridge and are over the rotor of the peristaltic pump to a desired tension when the first cartridge and the second cartridge are mounted onto the peristaltic pump;
• the plurality of hoses (11) is manufactured by an injection molding process with a wall thickness from 0.3 mm to 1.2 mm and a circular internal cross-sectional area of from 0.07 to 2.6 mm2 wherein the inner cross-sectional area has a tolerance of at most ±12.5%;
• the plurality of hoses (11) further having a Shore hardness of from 35 to 65 Shore-A, the combination of these features allows the multiple hoses to be completely closed by the rotating rotor of the peristaltic pump when they are stretched over the rotor with a tensioning force of between 1 and 10 N without pressing them onto an opposing hose bed, and the individual hoses have substantially the same flow rates without the individual lengths of the hoses being adjusted with separate tensioning means.