Putnam plastics develops super-tri tubing, an advanced tri-layer technology

Standard tri-layer tubing, often used in PTCA (percutaneous transluminal coronary angioplasty) delivery systems, consists of three distinct polymer layers within one wall. Tri-layer construction typically involves a HDPE (high density polyethylene) inner liner for lubricity, a proprietary middle layer for bonding, and a polyamide outer layer which when combined, provides a unique combination of strength, trackability and bondability. Super-Tri tri-layer tubing technology utilizes the same material combination as traditional tri-layer tubingwhile providing superior performance characteristics.

As the requirements for medical catheters and devices evolve, the need for innovative extrusion solutions has never been greater.  For example, Super-Tri tubing assists in issues that have evolved from higher rated burst pressure balloons catheters.  Compared to traditional tri-layer tubing, Super-Tri tubing has decreased elongation by 750% and increased burst strength by 98%. This makes this tubing technology ideal for balloon catheters requiring high pressure balloons.  The significant reduction in the elongation and increased tensile strength considerably decrease the potential for guidewire lock-up. In addition, the Super-Tri tubing technology meets the same sizing, tolerances, and material configurations as traditional tri-layer tubing.

“Putnam’s new Super-Tri tubingtechnology has the ability to provide dramatically increased tensile strength while minimizing elongation,” saidBill Appling, Director of Engineering and Assembly, Putnam Plastics. “For example, a PTCA inner member where tri-layer tubing is most commonly used can now be produced with a 130% improvement in ultimate tensile strength, and 170% increase in tensile strength at yield.  This product provides new options in the design of catheters for the next generation of devices where strength and size are critical.”