Method for manufacturing of a tubular object for insertion into a body passageway
Disclosed are a method and an apparatus for manufacturing a medical tubular object, such as a catheter, for insertion into a body passageway. The method comprises the steps of extruding a tube by pushing tube material though an extrusion nozzle and cutting the extruded tube at a predetermined length. Further, an initial part of the extruded tube is advanced onto a tapered mandrel arranged adjacent the extrusion nozzle such that a flared end is formed, and after a predetermined length of the extruded tube has been advanced onto the tapered mandrel, the tapered mandrel is moved away from the extrusion nozzle to prevent that the rest of the extruded tube is expanded by the tapered mandrel.
1. An apparatus for manufacturing a medical tubular object as an extruded tube for insertion into a body passageway, comprising:
an extrusion nozzle adapted to extrude a tube;
an extruder arranged to push tube material through the extrusion nozzle in an extrusion direction;
a cutting tool for cutting the extruded tube at a first predetermined length in a vicinity of the extrusion nozzle; and
a tapered mandrel adjacent and in alignment with the extrusion nozzle and tapering toward the extrusion nozzle such that an initial part of the extruded tube is advanced onto the tapered mandrel as the extruded tube is being extruded, whereby a flared end is formed on the initial part of the extruded tube,
wherein the tapered mandrel is moveable away from the extrusion nozzle such that moving the tapered mandrel away from the extrusion nozzle after a second predetermined length of the extruded tube has been advanced onto the mandrel prevents the rest of the extruded tube from being expanded by the tapered mandrel.
2. The apparatus of claim 1 , wherein the medical tubular object is a catheter.
3. The apparatus according to claim 1 , wherein the tapered mandrel is moveable along the extrusion direction.
4. The apparatus according to claim 1 , wherein the tapered mandrel is moveable at a speed that substantially corresponds to a speed at which the extruded tube is produced.
5. The apparatus according to claim 1 , wherein the tapered mandrel has a conical shape or a frusto-conical shape.
6. The apparatus according to claim 1 , further comprising at least one clamp for securing the initial part of the extruded tube to the tapered mandrel.
7. The apparatus according to claim 1 , further comprising at least one punch arranged in the vicinity of the extrusion nozzle for punching holes in the extruded tube.
8. The apparatus according to claim 1 , wherein the extrusion nozzle further comprises a centrally protruding pin, wherein the extrusion nozzle is arranged to extrude the tube over the centrally protruding pin.
9. The apparatus according to claim 8 , wherein the centrally protruding pin aligns and inserts into an opening bore at a tapered end of the tapered mandrel.
10. The apparatus according to claim 1 , further comprising at least two moveable parts having inner surfaces shaped complementary to a predetermined shape for a closed tip portion of the extruded tube when the moveable parts are brought together around the closed tip portion of the extruded tube.
11. The apparatus according to claim 3 , further comprising a guide rail, wherein the tapered mandrel is mounted and moveable on the guide rail to move along the extrusion direction.
12. The apparatus according to claim 1 , further comprising a holding plate arranged below the tapered mandrel and the extrusion nozzle to support the extruded tube.