Device for preserving a predetermined dose of liquid-based substance, and range of such devices

A device for preserving a predetermined dose (18) of liquid-based substance comprising a tube (11;

• 35) of weldable plastic material extending between a first end (13;
• 36) and a second end (14;
• 37), which tube (11;
• 35) comprises a receiving section (21;
• 38) provided to contain said predetermined dose (18) of liquid-based substance and an obturating section (22;
• 39) provided to obturate the tube (11;
• 35) after the receiving section (21;
• 38) has been filled with said predetermined dose (18) of liquid-based substance, which obturating section (22;
• 39) extends between the first end (13;
• 36) of the tube (11;
• 35) and the receiving section (21;
• 38), which tube (11;
• 35) has:
• an initial state in which the receiving section (21;
• 38) and the obturating section (22;
• 39) are of circular cross-section;
• and
• a state of use in which the receiving section (21;
• 38) is of circular cross-section while the obturating section (22;
• 39) comprises a welded (19;
• 40) constriction of the wall of the tube (11;
• 35) forming a hermetic seal and comprises a transition zone (23;
• 41) between the welded constriction (19;
• 40) and the receiving section (21;
• 38);
• characterized in that the tube (11;
• 35) comprises a differentiating border (28;
• 42) over at least part of the obturating section (22;
• 39) giving the external surface of the tube (11;
• 35) a different visual appearance from the visual appearance of the external surface of the tube (11;
• 35) outside the differentiating border (28;
• 42), which differentiating border (28;
• 42) is configured to be visible from the first end (13;
• 36) when the tube (11;
• 35) is in the state of use.