Method of bonding a hub to a Teflon-lined catheter body

• US 4,806,182 A
• Filed: 10/15/1985
• Issued: 02/21/1989
• Est. Priority Date: 10/15/1985
• Status: Expired due to Term

• Current Assignee: Schneider Electric SE
• Original Assignee: Schneider Saddlery Company Incorporated
• Inventors: Rydell, Mark A., Shockey, Rick L.
• Primary Examiner(s): Cashion, Jr., Merrell C.
• Application Number:
  US06/787,736
• Time in Patent Office: 1,225 Days
• Field of Search: 128/348.1, 264/320, 264/322, 264/127, 156/196, 156/204, 156/211-212, 156/214, 156/218, 156/293-294, 156/303.1, 156/245
• US Class Current: 156/211
• CPC Class Codes: A61M 25/0014 Connecting a tube to a hub
• CPC Class Codes: B29C 35/02 Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mouldcold vulcanisation B29C35/18 ; vulcanising tyres, presses therefor B29D30/0601
• CPC Class Codes: B29C 57/00 Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor , e.g. collapsible mandrels
• CPC Class Codes: B29C 57/005 the end of an internal lining fixing the end of the lining B29C63/346
• CPC Class Codes: B29C 63/346 Fixing the end of the lining shaping tube ends B29C57/005
• CPC Class Codes: B29C 65/00 Joining or sealing of preformed parts , e.g. welding of plastics materials; Apparatus therefor general aspects of processes or apparatus for joining preformed parts B29C66/00; using porous material formed by internal pressure generated therein for joining preformed parts B29C44/1228, B29C44/326
• CPC Class Codes: B29C 66/022 Mechanical pre-treatments, e.g. reshaping
• CPC Class Codes: B29C 66/0222 without removal of material, e.g. cleaning by air blowing or using brushes
• CPC Class Codes: B29C 66/02245 Abrading, e.g. grinding, sanding, sandblasting or scraping
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/522 Joining tubular articles B29C66/53241 takes precedence
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29K 2027/18 PTFE, i.e. polytetrafluorethene , e.g. ePTFE, i.e. expanded polytetrafluorethene
• CPC Class Codes: B29K 2075/00 Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• CPC Class Codes: B29L 2031/7542 Catheters
• CPC Class Codes: Y10S 138/03 Polytetrafluoroethylene, i.e. PTFE
• CPC Class Codes: Y10T 156/1026 with slitting or removal of material at reshaping area prior to reshaping
• CPC Class Codes: Y10T 156/1028 by bending, drawing or stretch forming sheet to assume shape of configured lamina while in contact therewith
• CPC Class Codes: Y10T 156/1031 with preshaping of lamina

Abstract

A method of attaching a plastic hub member to the proximal end of a Teflon-lined thermoplastic tubular catheter so as to prevent delamination of the Teflon lining at the site of the attachment. The thermoplastic outer layer of the tubular catheter is removed in a grinding operation for a predetermined distance from the proximal end of the tube to expose a short length of the Teflon lining. Next, a spinning forming tool is forced against the proximal end of the tubular catheter causing the exposed Teflon lining to be rolled back over the outer surface of the thermoplastic tube. Next, the proximal end of the catheter is inserted into the bore of the hub and because the Teflon layer has been rolled over the end portion of the tubular catheter, it is trapped against an internal flange formed in the catheter hub when the hub is adhesively bonded to the exterior of the thermoplastic layer and prevented from delaminating and possibly occluding the lumen of the catheter.

Claims

1. A method of attaching a plastic hub to the proximal end of an elongated flexible tubular catheter of the type having an outer thermoplastic tube whose lumen is lined with a Teflon layer comprising the steps of:

(a) cutting a predetermined length of the Teflon-lined tubing from a continuous length of such materials;

(b) removing the outer thermoplastic layer from a short end portion of said catheter body to expose the underlying Teflon layer in said short end portion;

(c) rolling the exposed portion of said Teflon layer back over the end of said thermoplastic tube; and

(d) inserting said end portion of said catheter body into a bore formed in said hub such that the rolled end portion of the Teflon layer is trapped and precluded from unrolling; and

(e) bonding said catheter body to the interior wall of said counterbore in said hub.

2. The method as in claim 1 wherein said step of rolling said Teflon layer back over the end portion of said flexible thermoplastic tubular member comprises:

(a) the step of rotating a symmetrical forming tool having a predetermined annular profile formed in the periphery thereof; and

(b) advancing the proximal end of said catheter body with the exposed Teflon layer against said profile.