Medical tube Coil & Braid Reinforced Shafts

FEATURES

• Mold Description
  Product Materials:	peek ptfe pfa
  Mold Material:	S136ESR
  Number of Cavities:	1
  Glue Feeding Method:	Hot runner
  Cooling Method:	Water cooling
  Molding Cycle	12.5s

  
  

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  Ansix Tech Launches Dedicated Coil & Braid Reinforced Shafts Initiative, Setting New Benchmark in Medical Tubular Component Manufacturing

  SHENZHEN, China – In the high-stakes arena of minimally invasive surgery, the functional performance of a catheter often hinges on a single, deceptively simple component: the reinforced tubular shaft. As global demand for interventional devices continues its relentless upward trajectory—with the medical tubing market projected to reach USD 12.68 billion by the end of 2025 and grow to USD 65 billion by 2030—the engineering challenges underpinning these critical conduits have never been more acute. Addressing this pressing industry need, Ansix Tech, a 28-year precision engineering powerhouse, has formally announced the launch of its dedicated Coil & Braid Reinforced Shafts project. This initiative marks a strategic pivot from being a component supplier to becoming a fully integrated joint engineering partner for medical device OEMs, systematically addressing the perennial industrial pain points of development risk, manufacturing cost, quality consistency, and on-time delivery.

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  Program Initiation: De-risking Innovation Through Digital Engineering

  The journey of a reinforced shaft at Ansix Tech begins not on the extrusion line, but in the digital domain. With a workforce exceeding 1,200 employees, including more than 200 dedicated designers and engineers, and infrastructure spanning four production bases across China and Vietnam—totaling 200,000 square meters of manufacturing space equipped with 260 injection molding machines ranging from 30 to 2,800 tons—the company has built a vertically integrated ecosystem that prioritizes front-loaded engineering intelligence.

   

  Every coil and braid reinforced shaft program initiates with a rigorous Design for Manufacturability (DFM) analysis. Ansix Tech’s engineering team conducts a comprehensive collaborative deep-dive into part geometry, material behavior, and overall mold functionality. Leveraging advanced computer-aided engineering (CAE) simulation software such as Moldflow and Moldex3D, engineers perform predictive modeling of melt flow behavior, identifying potential air traps and weld lines before a single tool is cut. For complex multi-lumen reinforced shafts, this virtual approach allows the engineering team to predict filling patterns across microscopic lumens, optimize gate locations to position weld lines away from critical functional zones, and simulate shrinkage behaviors and residual stress distributions that could compromise dimensional stability after reinforcement integration.

   

  The value delivered at this stage is substantial: by proactively identifying features that may be manufacturable but prohibitively expensive—uneven wall thicknesses prone to sink marks, undercuts requiring complex side-cores, or geometries misaligned with high-volume production constraints—Ansix Tech systematically eliminates downstream technical risks. In numerous catheter shaft projects executed to date, this approach has helped clients reduce assembly time by up to 40 percent and lower material costs by 5 to 18 percent, all while ensuring that clinical design intent remains fully compatible with mass manufacturing realities. This “test before you invest” methodology de-risks the entire program, enabling design refinements at a stage where changes cost a fraction of what they would during active production.

   

  Material Selection & Supply Chain Synergy: Balancing Performance, Biocompatibility, and Cost

  The performance of a coil or braid reinforced shaft is a direct function of its constituent materials. Ansix Tech has developed a rigorous material selection framework that systematically balances mechanical requirements, chemical compatibility, sterilization tolerance, radiopacity needs, and total cost of ownership.

   

  For the polymer matrix, the company’s material engineering team selects from a portfolio of medical-grade engineering thermoplastics and thermoplastic elastomers (TPEs), each delivering distinct performance characteristics. Thermoplastic Polyurethane (TPU) provides exceptional biocompatibility—passing ISO 10993-4/5 tests for long-term human tissue contact—combined with superior flexibility (Shore hardness ranging from 60A to 90A) and high transparency that supports clinical visualization during catheter navigation. TPU also offers excellent chemical resistance compatible with common disinfectants including alcohol and iodine, and its hydrolytic resistance outperforms standard polyurethanes. For applications requiring the ultimate in kink resistance and flexural recovery, PEBAX® (Polyether Block Amide) is selected. This medical-grade block copolymer delivers best-in-class kink resistance with greater than 95 percent elastic recovery even after 180-degree bending, combined with outstanding fatigue resistance that makes it ideal for high-cycle operations such as cardiac ablation and neurovascular microcatheters. For structural load-bearing segments demanding high rigidity and dimensional stability, Nylon (Polyamide, typically PA12) serves as the structural backbone, offering excellent wear resistance (Shore D 70-80), low friction coefficient, and short-term temperature tolerance up to 150°C for high-temperature sterilization processes.

   

  To enhance radiopacity for fluoroscopic visualization, Ansix Tech integrates high-loading radiopaque filler systems—barium sulfate (BaSO₄), bismuth trioxide (Bi₂O₃), or tungsten powder in loadings up to 80 percent by weight—uniformly dispersed within the polymer matrix to ensure clear X-ray visibility without compromising extrusion processability.

   

  For the reinforcement layer, the company specifies from a range of high-performance metal wires. SUS304 stainless steel flat wire (0.013 mm × 0.064 mm to 0.025 mm × 0.127 mm cross-sections) provides excellent tensile strength and precision dimensional control for catheter braiding applications. Flat wire configurations deliver higher load-carrying capacity within reduced cross-sectional space compared to traditional round wire designs. For applications requiring MRI compatibility, Nitinol (Nickel-Titanium) reinforcement wire offers superelasticity and shape-memory characteristics with long-term durability under repeated deformation—suited for neurovascular guidewires, cardiac stents, and steerable catheter shafts that must navigate tortuous anatomy.

   

  The combination of tunable polymer properties and precision metallic reinforcements enables Ansix Tech to engineer coil and braid reinforced shafts for specific clinical demands: braided reinforcement architecture delivers high burst pressure resistance (capable of withstanding pressures exceeding 1,200 PSI in high-pressure applications) and superior 1:1 torque transmission for precise tip control, while coiled reinforcement architecture provides optimized kink resistance and excellent flexibility for navigating challenging vascular pathways with good pushability.

   

  Advanced Mold Engineering: Precision Tooling Demands for Volume-Ready Extrusion

  The successful production of coil and braid reinforced shafts hinges critically upon the quality of the extrusion tooling—specifically, the crosshead die assembly that encapsulates the reinforcement layer between the inner liner and outer jacket. Ansix Tech’s mold engineering team brings decades of experience in designing extrusion tooling for thin-walled reinforced medical tubing, with capabilities extending from 1.5F to 38F shaft diameters and support for single-lumen as well as multi-lumen configurations (up to 20 lumens in select applications).

   

  Extrusion Die Flow Analysis: Leveraging computational fluid dynamics (CFD) simulation for extrusion rheology, Ansix Tech engineers perform detailed analysis of polymer flow patterns through the crosshead die. The die design consists of three primary components: the mandrel that defines the inner lumen geometry, the die body that shapes the outer diameter, and strategically positioned flow channels that distribute molten polymer uniformly around the continuously passing reinforcement structure. For multi-lumen reinforced shafts requiring co-extrusion of two or more different durometer polymers within the same profile, the flow balancing challenge becomes exponentially more complex. Engineering teams tune individual flow restrictors and channel geometries to ensure simultaneous and uniform arrival at the die exit, preventing lumens from collapsing or shifting during extrusion. Key rheological parameters—melt viscosity (typically 50 to 2,000 Pa·s depending on polymer type and processing temperature), shear rate distribution, and pressure drop across the die—are simulated and experimentally validated during tooling qualification.

   

  Die Material Selection & Manufacturing Challenges: Ansix Tech constructs extrusion crosshead dies from medical-grade tool steels selected for wear resistance, thermal conductivity, and surface finish retention. For high-volume production runs with glass-filled or mineral-filled polymer compounds, where abrasive fillers accelerate wear, the company employs powder metallurgy tool steels with hardness exceeding 60 HRC. The manufacturing challenges for high-precision extrusion tooling are formidable: concentricity tolerances between the mandrel and the die body must be maintained within ±0.005 mm to ensure uniform wall thickness distribution around the full 360-degree circumference of the shaft. The mandrel tip geometry requires single-point diamond turning to achieve sub-micron surface finishes (Ra < 0.1 µm) that prevent polymer hang-up and reduce melt fracture risk. Internal flow channels must be polished to mirror-like finishes to eliminate dead spots where degraded polymer could accumulate and compromise product cleanliness.

   

  Die Cooling System Design: Ansix Tech’s extrusion tooling incorporates precision cooling channel layouts engineered for rapid, uniform heat extraction. The first cooling stage—integrated directly into the die body just beyond the polymer exit orifice—is critical for freeze-off of the outer skin and dimensional stabilization. Multiple independent cooling zones are strategically placed along the die body, with integrated water circulation circuits designed to maintain turbulent flow (Reynolds number exceeding 4,000) for maximum heat transfer efficiency. Temperature control accuracy is typically maintained within ±1°C across each cooling zone, with flow rates monitored and logged for each production batch.

   

  Feed System & Ejection Design: The extrusion feed zone is engineered to deliver polymer to the die with minimal pressure drop and controlled shear heating—typically designing for pressure drops between 500 to 3,000 psi depending on polymer viscosity. For multi-extruder co-extrusion configurations, melt filtration systems with 40- to 200-micron screen packs are integrated to remove contaminants and agglomerated filler particles before they reach the die exit.

   

  Extrusion Processing & Manufacturing Workflow Optimization

  The manufacturing of high-quality coil and braid reinforced shafts requires a meticulously controlled, multi-stage extrusion workflow operating under ISO 13485:2016 certified conditions, with dedicated ISO Class 8 cleanrooms maintaining stringent contamination control standards. Ansix Tech has developed a production protocol that addresses the two most persistent challenges in composite shaft manufacturing: achieving consistent reinforcement encapsulation without voids or wire exposure, and maintaining dimensional stability across high-volume production runs.

   

  Material Preparation & Pre-conditioning: Medical-grade polymer resins are sourced with lot-specific material certifications and chain of custody documentation. Prior to extrusion, each resin batch is dried in dehumidifying hoppers to achieve optimum moisture content—typically below 0.02 percent for hygroscopic polymers such as nylons and TPUs—preventing hydrolytic degradation and bubble formation during processing. Reinforcement wires are spooled onto dedicated pay-off stands under controlled tension monitoring.

   

  Extrusion & Reinforcement Integration: Depending on shaft construction requirements, two distinct processing routes are employed. For braid-reinforced shafts, the inner liner is first extruded onto a precision-ground mandrel and cooled. The liner then passes through a braiding station—typically a 16- or 24-carrier braider with programmable variable braid density (picks per inch, PPI) control—where metallic wires are interwoven around the liner in designated patterns including diamond (2-over-2), half-diamond (1-over-1), or herringbone (1-over-2-over-2) configurations. The outer jacket is subsequently extruded over the braided assembly, fully encapsulating the reinforcement. For coil-reinforced shafts, precision-wound coil springs are placed over the inner liner (or over the mandrel prior to liner extrusion depending on coil positioning requirements), followed by outer jacket extrusion.

   

  Process Parameter Optimization: Ansix Tech has systematically optimized key extrusion parameters to achieve both efficiency gains and cost reduction. Barrel temperature profiles—typically ranging from 160°C to 260°C depending on polymer—are precisely controlled across multiple heating zones. Screw speed (typically 20 to 100 RPM), haul-off speed, and cooling bath temperature and length are tuned to maintain wall thickness tolerances within ±0.01 mm. In-line measurement systems incorporating laser micrometers and ultrasonic wall thickness sensors provide real-time dimensional feedback for closed-loop process control. The company has achieved measurable reductions in scrap rates through optimized parameter windows—reducing material waste from industry-typical ranges to demonstrably lower levels through validated validation protocols encompassing consecutive production runs conducted under normal production conditions.

   

  Cooling, Pulling, and Cut-to-Length Operations: After exiting the crosshead die, the continuous reinforced tubing passes through a series of vacuum sizing tanks and water cooling baths. Vacuum sizing maintains lumen circularity while the polymer solidifies—a critical consideration for multi-lumen reinforced shafts where lumen geometry directly impacts device functionality. Puller speed is synchronized with extruder output to maintain consistent wall thickness. In-line cutting stations with servo-driven flying cutters produce repeatable cut lengths with accuracy maintained within ±0.5 mm.

   

  Finished Product Inspection & Cleanroom Processing: Following extrusion, each cut shaft undergoes visual inspection under magnification for surface defects, wire exposure, and any contamination. Dimensional verification includes inner diameter (ID), outer diameter (OD), and wall thickness measurements. The company operates automated in-line measurement systems that inspect every shaft passing through the production line—ensuring complete traceability against customer specifications.

   

  Packaging & Delivery: Finished shafts are cleaned using validated cleaning protocols, then packaged in medical-grade, sterile-barrier materials compatible with the client’s terminal sterilization process. Bulk packaging options are available for OEMs with proprietary filling lines, and sterile pouching is provided for ready-to-use configurations. All packaging operations are conducted within controlled environments to prevent particulate contamination. The manufacturing line is engineered for rapid throughput, incorporating quick-change tooling systems and automated packaging equipment that significantly reduces changeover time between product runs.

   

  Customer Value Proposition: Systematic Cost Reduction Without Quality Compromise

  Perhaps the most compelling aspect of Ansix Tech’s coil and braid reinforced shafts initiative is the company’s systematic approach to cost reduction—achieved through material optimization, process efficiency improvements, and intelligent engineering rather than manufacturing shortcuts.

   

  Material-Driven Cost Reduction: Material typically represents the largest cost component in reinforced medical tubing. Ansix Tech’s material science team actively guides clients through resin selection based on total landed cost rather than simply specifying the most expensive polymer available. For applications where the ultimate kink resistance of PEBAX exceeds the clinical requirement, the company may recommend TPU formulations or TPU/PEBAX blends that deliver acceptable performance at significantly reduced material cost. The company’s engineering team also assists clients in comparing flat wire versus round wire reinforcement costs, quantifying the trade-off between enhanced performance and added manufacturing complexity.

   

  Process-Driven Cost Reduction: Ansix Tech has invested heavily in process optimization to lower per-unit manufacturing costs. Cycle time reduction initiatives—achieved through optimized cooling channel design in extrusion tooling and fine-tuned screw profiles—increase throughput while reducing energy consumption per part. Industry research indicates that cooling time alone can account for 50 to 70 percent of an injection molding cycle; Ansix Tech’s conformal cooling designs have achieved cycle time reductions exceeding 15 percent in validated production runs. Scrap minimization through closed-loop process controls reduces material waste at the production line level. By shortening overall program timelines through front-loaded DFM analysis—which eliminates downstream design iterations that could otherwise add months to development cycles—Ansix Tech accelerates clients’ path to regulatory submissions and commercial launch.

   

  Volume-Driven Cost Reduction: With 260 injection molding machines and dedicated extrusion lines operating across four production campuses, Ansix Tech scales production volumes from pilot batches to millions of units annually without compromising quality. The company’s design team actively consolidates components—reducing assembly complexity and lowering inventory holding costs for clients. In many projects, assembly time reductions of up to 40 percent have been realized.

   

  Quality Assurance & Verification: Building Regulatory Confidence From Day One

  Medical device manufacturing demands nothing less than absolute quality assurance—and Ansix Tech has structured its entire operation around validated processes that meet or exceed international regulatory expectations. The company maintains ISO 9001, ISO 14001, IATF 16949, and ISO 13485 certifications, providing a compliance framework that satisfies the stringent requirements of regulated medical manufacturing.

   

  The quality verification protocol for coil and braid reinforced shafts follows a structured validation sequence. Installation Qualification (IQ) ensures extrusion lines and auxiliary equipment are installed correctly against manufacturer specifications. Operational Qualification (OQ) tests equipment operation across defined parameter ranges. Performance Qualification (PQ) runs production batches under simulated production conditions to verify consistent output. The standard industry expectation is that the first three consecutive production batches undergo full validation testing to demonstrate consistent conformance to specifications.

   

  Quality control encompasses every stage of the manufacturing process: incoming raw material testing (including verification of polymer resin specifications against ISO 10993 biocompatibility requirements, dimensional inspection of reinforcement wire and certificate of conformance verification), in-process monitoring (continuous extrusion data logging for temperature, pressure, speed, and tension; real-time dimensional measurement through automated gauging; and visual inspection under controlled lighting conditions), and finished product testing (tensile testing to validate mechanical performance, burst pressure testing for braided shafts, kink resistance evaluation for coiled shafts, torque transmission measurement for steerable shafts, and radiopacity verification per customer requirements). All test data is logged with full lot traceability, providing the documented evidence required for regulatory submissions.

   

  Strategic Outlook: Long-Term Partnership Model

  As the medical device industry moves into a new phase defined by both innovation and efficiency, Ansix Tech’s commitment to technical leadership positions the company as an indispensable partner for medical device OEMs developing next-generation interventional platforms. By embedding engineering expertise directly into client development teams—providing DFM insight, material selection guidance, extrusion tooling design, and volume-scale manufacturing expertise all within a single integrated ecosystem—Ansix Tech delivers not just components, but comprehensive solutions.

   

  From the initial digital concept to FDA-ready validation documentation, from prototype qualification to million-unit annual production runs, Ansix Tech has built the infrastructure and the engineering expertise required to turn complex clinical visions into reliable, cost-effective, commercially successful medical devices. With 28 years of precision manufacturing heritage and a global footprint spanning four production facilities, the company is ready to partner with medical innovators worldwide in bringing the next generation of coil and braid reinforced shaft technologies—and the life-saving procedures they enable—to patients who need them most.

   

  Media Contact:

  Ansix Tech Marketing & Communications

  Email: info@ansixtech.com

  Website: www.ansixtech.com

   

  About Ansix Tech: Founded in Hong Kong in 1998, Ansix Tech is a global leader in precision injection molding and extrusion for medical devices, with four ISO-certified production bases across China and Vietnam, over 1,200 employees, and 28 years of industry experience. The company holds ISO 9001, ISO 14001, IATF 16949, and ISO 13485 certifications.

   

   

   

   

   

  Ansix Tech Co Ltd

  If you have any plans related to Medical tube Coil & Braid Reinforced Shafts , you can contact us at any time. We will turn your ideas into reality, let you realize your dreams, and obtain large orders from the market. Our contact information is info@ansixtech.com. Or contact our CTO, mail: stephen@ansixtech.com

   

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