Apparatus for reinforcing tubing
Apparatus for producing a continuous flexible tubular conduit
Method of manufacturing reinforced plastic hoses
Method and apparatus for making tubular products such as catheters
Method of making a catheter Patent #: 4764324
ApplicationNo. 653886 filed on 05/28/1996
US Classes:264/103, WITH TWINING, PLYING, BRAIDING, OR TEXTILE FABRIC FORMATION264/171.29Including rotation of shaping surface or material being shaped
ExaminersPrimary: Tentoni, Leo B.
Attorney, Agent or Firm
Foreign Patent References
International ClassB29C 047/02
AbstractA process for making a reinforced tubular product, especially a catheter, in a single extrusion step. A reinforcing member is applied to an extruded thermoplastic catheter body of about its finished size which is softened by heating while tensioning the reinforcing member to control the surface deformation or penetration of the catheter wall by the reinforcing member to produce an irregular surface contour on the catheter body. The catheter body is then smoothed in a sizing die burying the reinforcement to form the finished product. The heating step may be in addition to or substituted by a curing step when a thermosetting or cross-linking material is used for the body. The reinforcement may be braid, or a helical wrap of one or more members applied at one or more controlled angles relative to the axis of the catheter to control the apparent stiffness and torque transmission efficiency of the catheter. The process is particularly adapted to making a catheter having its reinforcement interrupted to provide a unitary non-reinforced distal tip. By this process, the radial location of the reinforcement in the wall of the catheter is easily controlled according to the material of the body, the heating conditions, and the tension on the reinforcing member. Multiple extrusions to form a reinforced catheter body are thus not required.