Multiple 3D Helicoidal curves tangent betwenen its

[#1]

In two companies in this country (Switzerland) i need to make this type of curvers BVIautomation and RegenHU, i try to do one by one, the second helicoidal curve begining in the end of first and i repeat this for 3 or 4 time as i need. Unfortunately the tangent property between its aren't good i try to do very very aproximately but the command extrusion by path,(loft or sweth, i thing in english) don't accept this curve.

I make this one with solidworks, you can built multiple helicoidal curves and tangents between its inside the same command.

This one we use to build a vibrant bowl (3 to 4 helicoidal curves) and special bits (ceringes system for extrusion 5 helicoidal curves in the same bits) in bioengineering.