BMW Universal II vs. Runthrough NS Floppy: How to Choose the Right Workhorse Guidewire for PCI?

When two workhorse guidewires are both trusted, the question is not which one is “better”—but which one better matches the vessel, lesion, and device-delivery requirements of the case.

In coronary intervention, the guidewire is often the first device to establish access to the target lesion and the platform over which balloons, stents, and other devices are delivered. For this reason, workhorse guidewires need to balance several characteristics at the same time: steerability, torque response, distal flexibility, trackability, support, and vessel-friendly tip behavior.

Two widely recognized options are the Abbott HI-TORQUE BALANCE MIDDLEWEIGHT UNIVERSAL II™ (BMW Universal II) and the Terumo RUNTHROUGH™ NS Floppy.

Both are designed for coronary intervention, but their design characteristics create different handling profiles. Understanding those differences can make guidewire selection more systematic rather than brand-driven.

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1. BMW Universal II and Runthrough NS Floppy: Both Workhorse Wires, Different Design Philosophies

 

Abbott BMW Universal II

The BMW Universal II is positioned by Abbott within its coronary workhorse guidewire portfolio. Abbott lists a 0.6 gf tip load and describes the wire with an Elastinite™ nitinol distal core, intermediate polymer covering, shaping ribbon, and hydrophilic distal coating.

The overall design aims to provide a balanced combination of:

• Distal flexibility
• Steerability and torque response
• Vessel navigation
• Device support
• Versatility across routine coronary procedures

The BMW Universal II is available in 0.014-inch diameter, with 190 cm and 300 cm configurations documented in U.S. device records. Straight and J-tip configurations are also available.

 

Terumo Runthrough NS Floppy

Terumo describes the RUNTHROUGH NS family as a PTCA guidewire family designed for workhorse and challenging coronary cases. Its DuoCore™ design combines a stainless-steel shaft with a nitinol distal core, while M Coat™ hydrophilic coating is intended to facilitate smooth manipulation.

For the Runthrough NS Floppy, published specifications identify:

• 0.014 inch diameter
• 180 cm standard length
• 1.0 gf tip load
• 10 mm shapeable distal tip
• Hydrophilic coating
• 2 mm silicone distal tip coating
• Light rail support

This combination gives the Runthrough NS Floppy a distinctive balance of a relatively soft distal tip with a responsive shaft.

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2. Side-by-Side Comparison

 

 

Specifications may vary by market, configuration, and product generation. Always verify the current manufacturer’s IFU and product specification before procurement or clinical use.

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3. The Most Important Difference: Tip Behavior Is Only Part of the Story

 

A common mistake when comparing coronary guidewires is to look only at tip load.

Tip load is important, but it does not completely determine how a guidewire behaves during PCI.

A practical guidewire assessment should consider at least four dimensions:

Tip flexibility → Torque response → Trackability → Support

A wire with a soft distal tip may be attractive for navigating tortuous anatomy, but the operator may also need sufficient shaft response and support to deliver a balloon or stent.

Conversely, a guidewire with a slightly more defined distal response may provide a different tactile balance during steering and device delivery.

This is why BMW Universal II and Runthrough NS Floppy should not be treated as interchangeable simply because both are classified as workhorse wires.

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4. When BMW Universal II May Be the Better Starting Point

 

BMW Universal II can be considered when the procedure calls for a balanced workhorse profile rather than a highly specialized crossing wire.

It may be particularly attractive when the operator values:

① Balanced support and flexibility

For routine coronary lesions, the wire needs enough flexibility to navigate the vessel while maintaining sufficient support for subsequent device delivery.

BMW Universal II’s workhorse positioning and 0.6 gf tip load place it in this balanced segment of the coronary guidewire market.

② Versatile coronary navigation

A workhorse wire may need to handle different lesion locations during everyday PCI rather than being optimized for one highly specific lesion type.

This makes versatility an important selection criterion.

③ A familiar “all-rounder” platform

For hospitals and distributors building a coronary guidewire portfolio, an all-round workhorse product can serve as a core SKU before adding more specialized wires for CTO, severe calcification, distal lesions, or other complex scenarios.

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5. When Runthrough NS Floppy May Be the Better Starting Point

 

Runthrough NS Floppy may be attractive when the operator places greater emphasis on smooth navigation, a floppy distal tip, and responsive steering.

Terumo’s design combines a stainless-steel proximal shaft with a nitinol distal core through its DuoCore™ construction, while the hydrophilic coating facilitates manipulation.

① Tortuous coronary anatomy

When vessel tortuosity makes distal navigation more demanding, the combination of distal flexibility and smooth coating can become particularly relevant.

② Side-branch navigation

In situations where selective steering into a branch is important, a shapeable distal tip and predictable torque response can be valuable.

③ When distal vessel protection is a priority

The Runthrough NS Floppy incorporates a soft, shapeable 10 mm distal tip and 2 mm silicone distal tip coating according to Terumo’s published specifications.

This design can be appealing when the operator wants a relatively gentle distal wire behavior during navigation.

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6. So, Which One Should You Choose?

 

There is no universal winner.

A more useful way to approach the decision is:

Choose BMW Universal II when:

• You want a balanced coronary workhorse
• You value a combination of flexibility and device support
• You need a versatile wire for routine PCI
• You prefer the handling characteristics of Abbott’s BMW platform
• You are building a broad, general-purpose coronary guidewire portfolio

Consider Runthrough NS Floppy when:

• You prioritize a floppy, shapeable distal tip
• Tortuous anatomy is an important consideration
• Smooth distal navigation is a priority
• You value the handling characteristics of Terumo’s DuoCore™ design
• You frequently work with branch or anatomically delicate coronary segments

The important point is that “workhorse” does not mean “one wire fits every case.”

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7. A Practical Guidewire Selection Strategy

 

For many PCI procedures, guidewire selection can be simplified into a three-step decision process:

Step 1 — Start with the anatomy

Ask:

• Is the vessel relatively straight or tortuous?
• Is the target lesion proximal, distal, or at a branch?
• Is the vessel caliber small?
• Are there severe angulations?

Step 2 — Define the primary task

Is the main challenge:

Navigation?

Then distal flexibility and trackability become more important.

Device delivery?

Then shaft support and rail characteristics become more important.

Selective branch access?

Then tip shapeability and torque response become increasingly important.

Step 3 — Match the wire to the next device

A guidewire is not used in isolation.

The operator should consider what comes next:

Guidewire → Balloon → Stent → Other delivery device

If the planned device is relatively difficult to deliver, the support characteristics of the wire become increasingly important.

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8. Why Experienced Operators May Keep Both Wires Available

 

One of the most practical lessons from workhorse guidewire selection is that having two familiar workhorse options can be more useful than searching for one “perfect” wire.

BMW Universal II and Runthrough NS Floppy have overlapping indications, but their handling characteristics are not identical.

In a challenging case, an operator may begin with one workhorse wire based on anatomy and tactile preference, then change strategy if the wire does not provide the desired combination of:

• Distal access
• Torque control
• Vessel tracking
• Device support

The goal is not to choose a “winning brand.”

The goal is to establish a safe and effective pathway for the next step of the procedure.

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9. BMW Universal II vs. Runthrough NS Floppy: Quick Decision Guide

 

 

This table is a selection framework, not a clinical protocol. Actual wire choice should be based on the patient’s anatomy, lesion characteristics, operator experience, compatible devices, and the manufacturer’s current instructions for use.

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10. Final Takeaway

 

BMW Universal II and Runthrough NS Floppy are both established coronary workhorse guidewires, but they should not be viewed as identical alternatives.

BMW Universal II emphasizes a balanced workhorse profile, while Runthrough NS Floppy combines a shapeable floppy distal tip with Terumo’s DuoCore™ construction and hydrophilic coating.

For routine PCI, the better question is therefore not:

      “Which guidewire is better?”

but:

      “Which guidewire gives the most appropriate balance of distal behavior, torque response, trackability, and support for this particular lesion?”

For medical device distributors, importers, and cath-lab procurement teams, understanding this distinction is also important when building a coronary guidewire portfolio. A strong portfolio should not rely on a single workhorse SKU; it should combine general-purpose wires with specialized options for different lesion and anatomy requirements.

The right workhorse guidewire is not necessarily the strongest or softest wire—it is the wire whose performance profile best matches the case.