Urinary catheter extension tube

1. An extension tube for a urinary catheter, comprising a tubular body with an inlet opening, an outlet opening and an internal lumen extending between said inlet opening and said outlet opening, wherein the tubular body has a length in the range of 30-70 cm and, in an erected state, a maximum cross-sectional extension in the range of 0.5-3 cm, said tubular body comprising at least a first layer, said first layer including natural and/or regenerated cellulose fibers, and wherein the tubular body is arranged to be compressible into a generally flat compacted storage state, and to be expandable into an expanded, tubular use state, wherein the tubular body has a plurality of longitudinally extending fold lines, extending along an axial direction of the tubular body, wherein the tubular body is arranged to remain intact and stable during a flow of water or urine through the internal lumen for at least 5 minutes.

2. The extension tube of claim 1 , wherein said first layer includes at least 40 wt % of natural and/or regenerated cellulose fibers.

3. The extension tube of claim 1 , wherein said first layer includes at least 70 wt % of natural and/or regenerated cellulose fibers.

4. The extension tube of claim 1 , wherein said first layer includes at least 90 wt % of natural and/or regenerated cellulose fibers.

5. The extension tube of claim 1 , wherein said first layer is made primarily of natural cellulose fibers.

6. The extension tube of claim 5 , wherein the first layer is made of paper.

7. The extension tube of claim 1 , wherein said first layer comprises regenerated cellulose fibers.

8. The extension tube of claim 7 , wherein the regenerated cellulose fibers are viscose.

9. The extension tube of claim 1 , wherein the tubular body is formed by the first layer as a single layer.

10. The extension tube of claim 1 , wherein the tubular body comprises at least one additional layer, said additional layer forming a laminated construction with said first layer.

11. The extension tube of claim 1 , wherein at least two of the plurality of longitudinally extending fold lines are arranged oppositely to each other, separated by the same circumferential distance along the tubular body in both directions.

12. The extension tube of claim 1 , wherein at least one of the plurality of fold lines is provided with a crease, to form a creased fold line.

13. The extension tube of claim 1 , wherein the tubular body, in the erected use state, has a polygonal cross-section.

14. The extension tube of claim 1 , wherein the tubular body, when in the erected use state, has a quadrilateral cross-section.

15. The extension tube of claim 14 , wherein the tubular body, when in the erected use state, has a cross-section formed as a parallelogram.

16. The extension tube of claim 1 , wherein the tubular body has a length in the range of 40-60 cm.

17. The extension tube of claim 1 , wherein the extension tube is provided with markings indicating a length along the axial direction of the extension tube.

18. The extension tube of claim 1 , wherein the tubular body, in an erected state, has a maximum cross-sectional extension in the range of 1-2.5 cm.

19. An extension tube assembly, comprising:

an extension tube in accordance with claim 1 , wherein the extension tube is arranged in a compacted state in a roll; and

an extension tube dispenser for housing said roll, and comprising a cutter for severing a length of dispensed extension tube from said roll.

20. The extension tube of claim 1 , wherein the material forming the extension tube has a surface weight in the range of 50-180 g/m 2 .

21. The extension tube of claim 1 , wherein the tubular body further comprises a flange extending along the full length of the tubular body and protruding away from the internal lumen.

22. The extension tube of claim 1 , further comprising friction enhancing elements arranged on an internal side of the extension tube to increase the friction between the extension tube and a therein introduced catheter.