Why do I need to specify PPI (Picks Per Inch) for a braided shaft RFQ?

PPI is one input to braid geometry, but its effect depends on wire size, braid pattern, carrier count, shaft diameter, and the rest of the stack-up. If you do not have a validated target, state the torque, pushability, flexibility, and profile requirements and ask the manufacturer to propose and verify a braid design.

Should I choose a flat wire or a round wire?

Neither geometry is universally better. Compare the available wall, lumen, radial support, flexibility, manufacturability, and inspection needs for the specific shaft. Ask the supplier to review candidate wire dimensions against the full stack-up and performance requirements.

When should I specify a hybrid braid-and-coil vs just a braid?

Consider a hybrid when one reinforcement architecture does not meet requirements across the full shaft length. Define the zones and transition location, then compare torque, pushability, flexibility, kink performance, profile, and transition manufacturability with the supplier. A hybrid is not automatically required for any one application.

What is the standard tolerance for inner and outer diameters?

There is no single tolerance that applies to every catheter shaft or process. Identify the dimensions that are critical to fit or performance, give the measurement method and acceptance limits if known, and ask the supplier to confirm capability and cost implications before freezing the drawing.

Do I need to supply ISO 10555 testing requirements in the RFQ?

State the intended device, market, regulatory pathway, and your required performance tests or acceptance criteria. ISO 10555-1:2023 covers general requirements for sterile, single-use intravascular catheters; the applicable standard parts and test limits depend on the device. Confirm the current requirements with your regulatory and quality teams.

Can I get a custom braided prototype in 1 week?

Timing depends on design readiness, material availability, tooling, process development, and inspection scope. Ask each supplier to separate review, material procurement, prototype build, and testing estimates, and list the assumptions behind each date.

Braid & Coil Reinforced Catheter Shaft RFQ Checklist

Why an Accurate RFQ Package Matters

Practical sourcing guidance. Program-specific limits and supplier capability must be confirmed for each design.

Published September 24, 2026 · Last updated October 10, 2026

Define the acceptance inputs

Share the dimensions, use conditions, and performance tests that drive fit and function. Ask the supplier to flag any requirements that cannot be met together.

Separate must-haves from preferences

Identify critical-to-quality dimensions and the reason each limit matters. Invite a capability review before tightening tolerances that do not affect device performance.

Make quotes comparable

Request the same material, volume, documentation, inspection, and testing assumptions from each supplier so differences in scope are visible.

Executive Summary: A useful shaft RFQ connects device requirements to the liner, reinforcement, jacket, transitions, inspection, and validation plan. The checklist above is a discussion aid, not a validated design or a promise of manufacturing feasibility. Mark unresolved inputs as open questions and ask the supplier to document assumptions before quoting.

Understanding the Shaft Stack-Up

Every dimension in your RFQ must account for the multi-layer stack-up. A change in the reinforcement wire gauge directly impacts the available wall thickness for the inner liner and outer polymer jacket.

Conceptual example only; layer geometry and dimensions vary by shaft design.

Compare design inputs with your supplier

Component Layer	RFQ input to confirm	Trade-off or evidence to request
Inner Liner & Tolerances	Liner material and dimensions State target ID, wall, lubricity needs, and tolerance method.	Thin-wall or etched liner options Confirm available dimensions, bonding approach, and stack-up with the supplier.
Reinforcement Pattern	Wire and reinforcement geometry Provide material, wire dimensions, braid pattern or coil pitch if known.	Alternate geometry or variable pattern Confirm transition design, inspection method, and process capability for the proposed zones.
Outer Jacket Reflow	Jacket material and zone map State polymer, durometer, zone lengths, and surface requirements.	Multi-zone jacket or soft distal section Review encapsulation, bonding, and thermal process limits across the full stack-up.

The Path from RFQ to Production

The sequence below is a planning framework. Actual timing and review gates depend on design readiness, material availability, supplier processes, and the agreed validation scope.

Phase 1: Scope & review

Confirm requirements

Resolve open questions, document quote assumptions, and review DFM feedback.

Phase 2: Material plan

Confirm availability

Confirm stock status, custom tooling or extrusion needs, and material traceability.

Phase 3: Prototype build

Agree on build scope

Set quantities, build records, inspection, and sample acceptance criteria.

Phase 4: Verification & transfer

Define responsibilities

Agree on device-specific verification, documentation, and production transfer responsibilities.

Request a dated schedule from each supplier with assumptions and dependencies stated; this page does not provide lead-time benchmarks.

Need a supplier review of your open requirements?

Send the draft checklist with any available drawings and identify the assumptions that still need agreement.

Request an engineering review

Risks, Pitfalls & Regulatory Blind Spots

Over-constraining the stack-up: Fixing every layer dimension, the overall ID, and the OD can create conflicting requirements after tolerances are considered. Identify the performance-critical dimensions and ask the supplier to show the proposed stack-up and its tolerance assumptions.

Ignoring reflow thermal limits: Requesting a soft jacket over dense reinforcement can affect encapsulation, bonding, and surface quality. Ask the supplier to review the polymer, reinforcement, wall targets, and reflow process together, then define inspection criteria for the finished surface.

Unclear verification requirements: Do not assume one test limit applies to all catheter shafts. State intended use and markets, identify applicable product requirements with your regulatory and quality teams, and ask the supplier to quote the agreed test methods and acceptance criteria.

Unclear biological evaluation scope: Share the intended use, patient-contacting materials, contact type and duration, and applicable markets. Biological evaluation is risk-based; the device manufacturer and its qualified regulatory team should determine the required evaluation and evidence.

Evidence, scope & limitations

This checklist is a sourcing aid, not a design specification, regulatory determination, or guarantee of supplier capability. Requirements depend on the finished device, intended use, market, and risk-management process. No comparable public dataset is cited here for quote times, yield, prototype success, or cost, so the page does not present those as universal benchmarks.

ISO 10555-1:2023 states its scope as general requirements for sterile, single-use intravascular catheters. Check the applicable part and current requirements for the specific device.
The FDA Recognized Consensus Standards database lists ISO 10555-1, third edition 2023-11 (recognition record 6-499). Recognition does not determine which requirements apply to an individual product or submission.
ISO 10993-1:2025 describes biological safety evaluation within a risk-management process. Confirm the applicable edition and evaluation with your regulatory and quality leads.

Sources checked October 10, 2026. Standards may be revised, and full normative requirements are available from the standards publisher.

Braid & Coil Reinforced Catheter Shaft RFQ Checklist Generator

1. Configure Shaft Requirements

2. Your Custom RFQ Checklist

1. Dimensional Specifications

2. Material Selection

3. Reinforcement Matrix

4. Intended Use & Verification

5. Secondary Operations & Assembly

6. Commercial & Quality Targets