Method for the sterile connection of pipes

Patent metadata

Field	Value
Publication number	US-10040247-B2
Application number	US-201113812988-A
Country	US
Kind code	B2
Filing date	Aug 5, 2011
Priority date	Aug 18, 2010
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A method for the sterile connection of pipes, consisting of: providing a first and a second pipe; a separating area of the first and second pipes is heated; both pipes are mechanically separated by exerting traction and/or shear force onto the pipes so that both pipes are respectively separated in the heated separating area; after the pipes are separated, a mechanical contact between the end of the first pipe section of the first pipe formed by the separation of the first pipe is established with the end of the first pipe section of the second pipe, formed by the separation of the second pipe, and mechanical contact is established such that the ends of the pipe sections still have, following heating when they come into mechanical contact with each other, a temperature such that they form a material fit connection without additional heating after separation.

First claim

The invention claimed is:

1. A method for the sterile connection of tubes, said method comprising the following steps:
providing a first tube and a second tube,
clamping the first tube between two clamping devices associated with the first tube and clamping the second tube between two clamping devices associated with the second tube,
heating a first separating region of the first tube located between the clamping devices associated with the first tube without using a cutting tool between such clamping devices and heating a second separating region of the second tube located between the second clamping devices associated with the second tube without using a cutting tool between such clamping devices;
mechanically separating the first tube by exerting a first force onto the first tube without the use of a cutting tool between the clamping devices associated with the first tube such that the first tube is separated in the first heated separating region into a first tube portion and a second tube portion and mechanically separating the second tube by exerting a second force onto the second tube without the use of a cutting tool between the clamping devices associated with the second tube such that the second tube is separated in the second heated separating region into a third tube portion and a fourth tube portion; and
producing mechanical contact, after the mechanical separation of the first tube and the mechanical separation of the second tube, between a first end of the first tube portion and a second end of the third tube portion, wherein
the mechanical contact is produced such that the first end and the second end, as a result of the heating, still have such a temperature when they come into mechanical contact with one another that they form an integral bond with one another without additional heating after the mechanical separation of the first tube and the mechanical separation of the second tube.

2. The method as claimed in claim 1 , wherein the first force for separating the first tube is generated by a rotation and/or a translation of part of the first tube and the second force for separating the second tube is generated by a rotation and/or a translation of part of the second tube.

3. The method as claimed in claim 1 , wherein the mechanical contact is produced such that the first end and the second end, when they come into mechanical contact with one another, each have a temperature that is greater than the melting point of the material of the first tube portion and the third tube portion, respectively.

4. The method as claimed in claim 1 , wherein the interval between a moment of mechanical contact and separation of the first tube and the second tube is at most 0.1 seconds.

5. The method as claimed in claim 1 , wherein the production of the mechanical contact between the first end of the first tube portion and the second end of the third tube portion comprises a rotation of at least part of the first tube portion and/or a rotation of at least part of the second tube portion.

6. The method as claimed in claim 5 , wherein the first tube portion and/or the third tube portion is/are rotated about an axis of rotation that runs at least approximately perpendicularly to a plane along which the first tube portion extends at least in part.

7. The method of claim 1 wherein mechanically separating the first tube and the second tube includes exerting a tensile force onto the first tube and the second tube.

8. The method of claim 7 wherein exerting the tensile force onto the first tube and the second tube includes applying the tensile force to the first heated separating region and the second heated separating region, respectively.

9. The method of claim 7 wherein mechanically separating the first tube and the second tube further includes exerting a shear force onto the first tube and the second tube.

10. The method of claim 1 wherein mechanically separating the first tube and the second tube includes tearing the first tube and the second tube in the first heated separating region and the second heated separating region, respectively.

11. The method of claim 1 wherein the interval between a moment of mechanical contact and the separation of the first tube and second tube is at most 0.05 seconds.

12. The method of claim 1 wherein the step of mechanically separating the first tube and the second tube occurs after completion of the step of heating the first separating region and the second separating region.

Assignees

• Schwalm Michael
• Brueckner Thomas
• Fresenius Kabi Deutschland Gmbh

Inventors

• Schwalm Michael
• BRüCKNER THOMAS

Classifications

• B29C66/0018

  being sterile · CPC title

• B29C66/7373

  Joining soiled or oxidised materials · CPC title

• B29C66/73921

  characterised by the materials of both parts being thermoplastics · CPC title

• B29C66/9221

  by measuring the pressure, the force or the mechanical power · CPC title

• B29C66/5221

  for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other · CPC title