Patent ID: 8563864

Claim:
A thin-walled, flexible and collapse-resistant thermoplastic tubing having a substantially smooth bore and a helical outer support bead structure, the tubing including at least one conductor helically disposed within said support bead structure, said tubing comprising: a flexible tubing wall formed of an elongate thermoplastic ribbon while molten being helically wrapped repeatedly on itself to partially overlap successive wraps of said ribbon a certain amount forming a helical lap joint where successive wraps of said ribbon heat-bond integrally to one another so that an elongate tubular body is formed; a second elongate thermoplastic portion while molten being helically wrapped about said tubular body at said lap joint and heat-bonding integrally thereto, said second elongate thermoplastic portion defining at least one elongate fine-dimension groove; at least one elongate conductor disposed in said elongate fine-dimension groove of said second elongate thermoplastic portion to extend helically around and along said elongate tubular body; said tubing further including an outwardly disposed elongate thermoplastic support bead extending helically around and along said elongate tubular body, whereby said tubular body, said elongate second thermoplastic portion and said support bead integrally heat bonding together to form a unitary structure.