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A nebulizer for a fluid which has a conveying tube for conveying fluid and a method for producing a thick-walled capillary. The conveying tube or the capillary is of multipart and/or double-walled construction, and in particular, is made up of a number of parts, such as an inner tube and an outer tu

A nebulizer for a fluid which has a conveying tube for conveying fluid and a method for producing a thick-walled capillary. The conveying tube or the capillary is of multipart and/or double-walled construction, and in particular, is made up of a number of parts, such as an inner tube and an outer tube. This construction allows the device to be manufactured more easily and cheaply, in particular, when the inner diameters are very small.

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1. A nebuliser for a fluid comprising a conveying tube for conveying the fluid, wherein the conveying tube is constructed as a thick-walled capillary of a double-walled construction, wherein the conveying tube includes an inner tube and an outer tube, wherein a hollow annular space is formed between

1. A nebuliser for a fluid comprising a conveying tube for conveying the fluid, wherein the conveying tube is constructed as a thick-walled capillary of a double-walled construction, wherein the conveying tube includes an inner tube and an outer tube, wherein a hollow annular space is formed between the inner tube and the outer tube, and wherein said hollow annular space is sealed in a gastight manner by a physical connection between the inner and outer tubes, at least one end of the inner tube being expanded substantially at least to the inner diameter of the outer tube, and further comprising an atomizing nozzle means for producing a spray of liquid particles that is located downstream of said conveying tube in a direction of fluid flow. 2. The nebuliser according to claim 1, wherein the inner tube and the outer tube extend concentrically with respect to one another. 3. The nebuliser according to claim 1, wherein the inner tube is connected to the outer tube by means of a radially widening connecting portion. 4. The nebuliser according to claim 3, wherein the inner tube is connected by means of at least one of welding and gluing. 5. The nebuliser according to claim 3, wherein the connecting portion is formed at one end of the inner tube. 6. The nebuliser according to claim 5, wherein the connecting portion is formed by means of molding at one end of the inner tube. 7. The nebuliser according to claim 3, wherein the connecting portion has an outer diameter which at least substantially corresponds to the inner diameter of the outer tube. 8. The nebuliser according to claim 3, wherein the connecting portion terminates flush with the end of the outer tube or set back therefrom. 9. The nebuliser according to claim 3, wherein an end of the tubes is connected by a spacer element of sleeve-shaped construction. 10. The nebuliser according to claim 9, wherein the spacer element has a wall thickness that amounts to at least 50% of the difference between the inner diameter of the outer tube and the outer diameter of the inner tube. 11. The nebuliser according to claim 3, wherein the length of the spacer element is less than 20% of the total length of the conveying tube. 12. The nebuliser according to claim 1, wherein the conveying tube comprises a plurality of parts. 13. The nebuliser according to claim 12, wherein the plurality of parts is formed by means of at least one of welding and adhesive bonding. 14. The nebuliser according to claim 1, wherein the conveying tube or at least part thereof is made of metal. 15. The nebuliser according to claim 1, wherein the conveying tube has a substantially smooth outer wall. 16. The nebuliser according to claim 1, wherein the conveying tube comprises an outer radial projection thereon. 17. The nebuliser according to claim 16, wherein the outer radial projection includes at least one of a flange having a crimped edge, and a radial indentation or recess. 18. The nebuliser according to claim 17, wherein the radial indentation or recess is formed by means of at least one of an annular groove, a depression and a bead. 19. The nebuliser according to claim 1, wherein the conveying tube has an outer diameter of 1 to 2 mm. 20. The nebuliser according to claim 1, wherein the length of the conveying tube is at least 50 mm. 21. The nebuliser according to claim 1, wherein the length of the conveying tube is at least 50 times the inner diameter of the conveying tube. 22. The nebuliser according to claim 1, wherein the conveying tube has an inner diameter of 0.1 to 0.6 mm. 23. The nebuliser according to claim 1, wherein the conveying tube has an outer diameter which is at least two times as large as the inner diameter. 24. The nebuliser according to claim 1, wherein the conveying tube performs a reciprocal movement during at least one of the removal of fluid, conveying of fluid, pressure generation and atomisation. 25. The nebuliser according to claim 1, wherein further comprising a container having a fluid chamber, which is opened by the attachment or insertion of the conveying tube. 26. The nebuliser according to claim 1, wherein the nebuliser is is adapted for use for medicinal treatment. 27. The nebuliser according to claim 26, wherein the nebuliser is an inhaler. 28. A nebuliser for a fluid comprising a conveying tube for conveying the fluid, wherein the conveying tube is constructed as a thick-walled capillary of a double-walled construction having an inner tube and an outer tube, wherein the space between the tubes is closed off at both ends by a physical connection between the tubes, the inner and outer tubes being rigidly connected together and wherein the conveying tube includes a valve for closing said inner and wherein the outer tube has an essentially cylindrical outer contour and at least one end of the inner tube is expanded substantially at least to the inner diameter of the outer tube, and further comprising an atomizing nozzle means for producing a spray of liquid particles that is located downstream of said conveying tube in a direction of fluid flow. 29. The nebuliser according to claim 28, wherein the valve is at one end of the conveying tube. 30. The nebuliser according to claim 28, wherein the conveying tube comprises the valve member or connecting member being separate and firmly connected to the conveying tube. 31. The nebuliser according to claim 30, wherein the conveying tube forms a receiving chamber or valve chamber for the valve member of the valve. 32. The nebuliser according to claim 28, wherein the inner tube is connected to the outer tube by means of a radially widening connecting portion. 33. The nebuliser according to claim 32, wherein the valve member or connecting member is mounted at the end of the conveying tube or at least one of the inner tube and outer tube. 34. The nebuliser according to claim 32, wherein the valve member or connecting member comprises a valve region having an external diameter which corresponds at least substantially to the external diameter of the outer tube or conveying tube. 35. The nebuliser according to claim 32, wherein the valve member or connecting member has a conical region. 36. The nebuliser according to claim 35, wherein the conical region forms a valve seat. 37. A nebuliser for a fluid comprising a movable conveying tube for conveying the fluid, wherein the conveying tube is constructed as a thick-walled capillary of a double-walled construction having an inner tube and an outer tube, the inner and outer tubes being rigidly connected together in a manner that the space between the tubes is closed off at both ends by a physical connection between the tubes, wherein the conveying tube is operable as a piston for pumping the fluid.