Method for connecting plastic tubes by plastically deforming and widening connecting stub
AssigneeSis Medical AG
InventorMichael Schwager
Life of this patent
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Abstract
A method for coaxially connecting a first plastic tube (10, 110) to a second plastic tube (20, 120), said plastic tubes (10, 20) in particular being provided as part of a medical catheter (102), the two plastic tubes (10, 20) being connected by way of a tubular connecting piece (50), characterized in that the first plastic tube (10) and/or the second plastic tube (20) are integrally molded from the outside onto the tubular connecting piece (50) using a forming process such that an adhesive and/or positive connection is produced.
Claims8
A method for coaxially connecting a first plastic tube of a medical catheter to a second plastic tube of said medical catheter comprising the steps of:
- a) plastically deforming an end region of the first plastic tube into a connecting stub having a length, wherein the first plastic tube is plastically deformed such that an outside diameter of the connecting stub is substantially narrowed in comparison with an outside diameter of the first plastic tube while a thickness of the first plastic tube remains constant, said plastic deformation comprising the steps of inserting an end portion of a cylindrical piece of wire into the end region of the first plastic tube and integrally moulding said end region of said first plastic tube onto the end portion of the cylindrical piece of wire to produce the connecting stub;
- b) widening a free end of the connecting stub by pushing a thickened region of the cylindrical piece of wire that adjoins the end portion of the cylindrical piece of wire into the free end of the connecting stub in a direction toward the first plastic tube, wherein an outside diameter of the thickened region corresponds to an inside diameter of the first plastic tube;
- c) pushing the second plastic tube coaxially over the connecting stub, at least over the length of said connecting stub;
- and
- d) forming at least one of an adhesive and a positive connection in a forming process.
A method for coaxially connecting a first plastic tube of a medical catheter to a second plastic tube of said medical catheter comprising the steps of:
- a) plastically deforming an end region of the first plastic tube into a connecting stub having a length, wherein the first plastic tube is plastically deformed such that an outside diameter of the connecting stub is substantially narrowed in comparison with an outside diameter of the first plastic tube while a thickness of the first plastic tube remains constant, said plastic deformation comprising steps of inserting an end portion of a cylindrical piece of wire into the end region of the first plastic tube and integrally moulding said end region of said first plastic tube onto the end portion of the cylindrical piece of wire to produce the connecting stub;
- b) pushing the second plastic tube coaxially over the connecting stub, at least over the length of said connecting stub;
- c) widening a free end of the connecting stub by pushing a thickened region of the cylindrical piece of wire that adjoins the end portion of the cylindrical piece of wire into the free end of the connecting stub in a direction toward the first plastic tube, said thickened region having an outside diameter corresponding substantially to an inside diameter of the first plastic tube;
- and
- d) forming at least one of an adhesive and a positive connection in a forming process.
Dependencies are inferred from the claim text.