US 11,891,548 B1
Process for concentrically bonding tubes using a hot melt adhesive
Scott T. Johnson, Anoka, MN (US); Frank Smaron, Maple Plain, MN (US); and Steve Leseman, Rogers, MN (US)
Assigned to MDCM SOLUTIONS, LLC, Maple Grove, MN (US)
Filed by MDCM Solutions, LLC, Maple Grove, MN (US)
Filed on Dec. 20, 2021, as Appl. No. 17/556,840.
Int. Cl. A61M 25/00 (2006.01); B29C 48/151 (2019.01); B29C 63/18 (2006.01); B29C 63/34 (2006.01); B29C 63/48 (2006.01); B29C 65/48 (2006.01); C09J 5/02 (2006.01); C09J 5/06 (2006.01); C09J 127/18 (2006.01); C09J 153/00 (2006.01); C09J 175/04 (2006.01); B29C 48/00 (2019.01); B29C 65/00 (2006.01); B29C 63/00 (2006.01)
CPC C09J 5/06 (2013.01) [A61M 25/0009 (2013.01); A61M 25/0045 (2013.01); B29C 48/0021 (2019.02); B29C 48/151 (2019.02); B29C 63/0017 (2013.01); B29C 63/18 (2013.01); B29C 63/34 (2013.01); B29C 65/4815 (2013.01); B29C 66/026 (2013.01); B29C 66/5221 (2013.01); B29C 66/52272 (2013.01); C09J 5/02 (2013.01); C09J 127/18 (2013.01); C09J 153/00 (2013.01); C09J 175/04 (2013.01); A61M 2025/0062 (2013.01); A61M 2205/0222 (2013.01); B29C 2063/483 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A process for concentrically bonding tubes comprising:
a. providing a first outer tube having a first outside surface of a first outer diameter, and a first lumen defined by a first inside surface of a first inner diameter;
b. providing a second tube made from a fluoropolymer and having a second outside surface of a second outer diameter, said second outer diameter being smaller than the first inner diameter, and a second lumen defined by a second inside surface of a second inner diameter;
c. inserting a core into the second lumen and temporarily securing the second tube in place on the core;
d. feeding the core and the second tube through an extrusion apparatus adapted to create an adhesive layer on the second outside surface;
e. inserting the second tube into the first lumen so that the second outside surface is in face-to face registration with the first inside surface with the adhesive layer residing there between; and
f. applying a heat source to melt the adhesive layer without damaging either of the first tube and the second tube, and then removing the heat source thereby allowing the adhesive layer to cool and form a bond between the first inside surface and the second outside surface.