Bladder catheter
View Patent ↗A bladder catheter for transurethral introduction into the urinary bladder by the urethrae, includes an elastic catheter shank with a fillable balloon element secured thereto and connected to a filling channel incorporated into the wall of the catheter shank. The balloon element and the catheter shank are made of polyurethane, a polyurethane-polyvinylchloride mixture or similar polyurethane-based material.
1. A bladder catheter for transurethral or suprapubic introduction into a urinary bladder comprising:
a flexible catheter shaft having a wall;
a filling channel defined in the catheter shaft; and
a balloon element made of a polyurethane-based material having a Shore hardness of 70 to 90 and fastened to the catheter shaft, the balloon element having a wall thickness of 5 to 20 micrometers and a preformed blow-molded shape, wherein
in a first empty and unrestrained base state, the balloon element is fitted over the catheter shaft with folds and has a first empty volume,
in a second state the balloon element is filled and unfolded without elastic expansion to a second fill volume greater than the first empty volume, and
in a third fully formed state, the balloon element has an elastic expansion to a third fill volume that is at least about double the second fill volume.
2. The bladder catheter as recited in claim 1 , wherein the polyurethane-based material includes at least one of a polyurethane and a polyurethane-polyvinyl chloride blend.
3. The bladder catheter as recited in claim 1 , wherein the wall thickness is 5 to 15 micrometers.
4. The bladder catheter as recited in claim 1 , wherein the balloon element in the first base state includes a plurality of longitudinally oriented folds, the balloon element clinging to the catheter shaft in the folded state.
5. The bladder catheter as recited in claim 1 , wherein the balloon element in the third fully formed state has a third fill volume of about 5 ml.
6. The bladder catheter as recited in claim 5 , wherein the balloon element in the second filled state has a second fill volume of 1.2 to 2.5 ml.
7. The bladder catheter as recited in claim 6 , wherein the balloon element has an empty volume of 0.01 to 0.03 ml in the first base folded state.
8. The bladder catheter as recited in claim 1 , wherein the balloon element has at least one of a spherical and a spindle form.
9. The bladder catheter as recited in claim 1 , wherein the balloon element has a third fill volume in the third fully formed state of about 30 ml.
10. The bladder catheter as recited in claim 9 , wherein the balloon element in the second filled state has a second fill volume of 4 to 12 ml.
11. The bladder catheter as recited in claim 9 , wherein the balloon element fits on the shaft and includes a plurality of longitudinal folds in the first base folded state.
12. The bladder catheter as recited in claim 11 , wherein the balloon element has an at-rest volume of less than 0.08 ml in the first base folded state.
13. The bladder catheter as recited in claim 11 , wherein the balloon element has a first empty volume of 0.01 to 0.03 ml in the folded state.
14. The bladder catheter as recited in claim 1 , wherein the balloon element includes a fold formation aligned in parallel with the catheter shaft and wherein the balloon element is joined to the catheter shaft without stretching the balloon element.
15. The bladder catheter as recited in claim 1 , wherein the balloon element includes shaft pieces fastenable to the catheter shaft, a center section and a transition region between the center section and the shaft pieces, and wherein a wall thickness of the balloon element continuously decreases from the shaft pieces to the center section.
16. The bladder catheter as recited in claim 15 , wherein at least one shaft piece includes a smoothed end rim.
17. The bladder catheter as recited in claim 1 , wherein catheter shaft includes an outer tube and an inner tube disposed inside the outer tube.
18. The bladder catheter as recited in claim 17 , wherein the inner tube is co-extruded with the outer tube.
19. The bladder catheter as recited in claim 17 , wherein the inner tube is made of a harder material than the outer tube.
20. The bladder catheter as recited in claim 1 , wherein the catheter shaft includes at least one filling opening in a region of the balloon element.
21. The bladder catheter as recited in claim 20 , wherein the at least one filling opening has at least one of a square and a rectangular shape.
22. The bladder catheter as recited in claim 1 , wherein the catheter shaft has a spiral reinforcement of metal.
23. The bladder catheter as recited in claim 1 , wherein the catheter shaft is an extruded shaft.
24. The bladder catheter as recited in claim 1 , wherein the balloon element has a safety range of volumetric expandability of 400 to 450 percent.
25. The bladder catheter as recited in claim 1 , wherein the balloon element has a safety range of volumetric expandability of 300 to 400 percent.
26. The bladder catheter as recited in claim 1 , wherein the balloon element has a third fill volume of about 5 ml and a filling pressure of 50 to 200 millibar in the third fully formed.
27. The bladder catheter as recited in claim 1 , wherein the balloon element has a volume of about 30 ml and a filling pressure of 50 to 200 millibar in the third fully formed state.
28. The bladder catheter as recited in claim 1 , wherein the catheter is for long-term use.
29. The bladder catheter as recited in claim 1 wherein the balloon element in the folded state has randomly distributed folds.
30. The bladder catheter as recited in claim 1 wherein the balloon element in the folded state has hanging sack folds.
31. The bladder catheter as recited in claim 1 wherein the balloon element in the folded state clings to the catheter shaft.
32. The bladder catheter as recited in claim 1 wherein the balloon element includes shaft pieces fastenable to the catheter shaft.
33. The bladder catheter as recited in claim 1 wherein the catheter shaft is made of a polyurethane-based material.
34. The bladder catheter as recited in claim 1 wherein the bladder catheter is for transuretheral introduction.
35. A method for manufacturing the bladder catheter as recited in claim 1 , comprising blow-molding the polyurethane-based material having a Shore hardness of 70 to 90 into the preformed shape of the balloon element having a wall thickness of 5 to 20 micrometers.
36. A bladder catheter for transurethral or suprapubic introduction into a urinary bladder comprising:
a flexible catheter shaft having a wall;
a filling channel integrated into the wall; and
a balloon element connected to the catheter shaft, the balloon element being made of a polyurethane-based material having a Shore hardness of 70 to 90, the balloon element being fillable from a folded state to a filled state, the balloon element in the folded state disposed around the catheter shaft with unrestrained hanging sack folds.
37. A method for manufacturing the bladder catheter as recited in claim 36 , comprising blow-molding the polyurethane-based material having a Shore hardness of 70 to 90 into a preformed shape of the balloon element having a wall thickness of 5 to 20 micrometers.
38. A bladder catheter for transurethral or suprapubic introduction into a urinary bladder comprising:
a flexible catheter shaft having a wall;
a filling channel integrated into the wall; and
a balloon element connected to the catheter shaft, the balloon element is made of a polyurethane-based material having a Shore hardness of 70 to 90, wherein the balloon element is fillable from a folded state to a filled state, the balloon element in the folded state disposed around the catheter shaft with randomly distributed unrestrained folds.
39. The bladder catheter as recited in claim 38 wherein the catheter shaft is made of a polyurethane-based material.
40. The bladder catheter as recited in claim 38 wherein the bladder catheter is for transuretheral introduction.
41. A method for manufacturing the bladder catheter as recited in claim 38 , comprising blow-molding the polyurethane-based material having a Shore hardness of 70 to 90 into a balloon element having a preformed shape and a wall thickness of 5 to 20 micrometers.