Why Multi-Core Ultra-Fine Coaxial Cables Have Become the Mainstream Choice for Intracardiac Echocardiography (ICE)

1. What Does ICE Application Mean for the Cable?

Intracardiac Echocardiography (ICE) is a high-risk, high-precision medical imaging application. The probe must pass through blood vessels and enter the cardiac chamber, performing real-time imaging within an extremely confined space.

This imposes exceptionally high requirements on signal transmission reliability and determinism.

In ICE systems, the cable is not merely a connection component — it directly affects imaging performance.

2. The Nature of ICE Signals: Low-Amplitude, High-Frequency Analog Signals

ICE probes output extremely low-amplitude, high-frequency analog ultrasound echo signals. These signals are characterized by:

• Extreme sensitivity to noise

• Very strict requirements for impedance and capacitance consistency

• Any signal degradation directly translating into reduced imaging clarity

Any crosstalk, reflection, or parameter fluctuation introduced by the cable will be amplified by the front-end system and ultimately appear in clinical imaging results.

3. Why ICE Cables Must Use an Ultra-Fine Multi-Core Structure

ICE probe bodies are extremely small, with strict diameter limitations for insertion sections. Therefore, the cable must provide:

• Extremely small outer diameter

• High channel count (commonly 64 or 128 channels)

• Reliable routing within confined spaces

In engineering practice, ICE cables typically use ultra-fine coaxial wires in the 46–50 AWG range. These are assembled into multi-core harness structures, allowing high channel density while maintaining minimal overall diameter.

4. Coaxial Cable vs. FPC: Why ICE Prefers Coaxial Solutions

Although Flexible Printed Circuits (FPC) offer high integration advantages, they present inherent limitations in ICE applications.

Limitations of FPC:

• No individual shielding, resulting in weaker EMI resistance

• Length limitations; manufacturing beyond 1.5 meters remains extremely challenging

• Planar structure with return path dependent on layout

• High risk of crosstalk in tightly arranged multi-channel designs

• Noticeable copper fatigue under dynamic bending

• Long-term impedance stability under high-frequency analog signals is difficult to maintain

Advantages of Coaxial Cable:

• Each channel has an independent, enclosed electromagnetic environment

• Stable and predictable return path

• Easier control of inter-channel consistency

• Greater structural durability under dynamic bending conditions

• Strong EMI resistance with fully shielded structure and low attenuation

For high-frequency, low-amplitude analog signal applications involving dynamic use — such as ICE — multi-core ultra-fine coaxial cables have become the mainstream engineering solution.

5. The Real Mechanical Working Conditions of ICE Cables

During procedures, ICE probes must:

• Be inserted into blood vessels

• Be advanced, rotated, and positioned

• Withstand repeated small-radius bending inside the body

This means the cable must endure tens of thousands of dynamic bending cycles at extremely small bending radii, without conductor fatigue fracture, solder joint failure, or electrical parameter drift.

ICE cable reliability is fundamentally the long-term coupling result of both mechanical and electrical performance.

6. The Engineering Core of ICE Cables: Consistency and Determinism

In ICE applications, the engineering focus is not on how extreme the performance of a single conductor can be, but rather:

• Whether ultra-fine dimensions meet clinical requirements (within 2 mm, even below 1 mm)

• Whether all channels maintain high consistency

• Whether parameters remain stable over long-term use

• Whether performance is reproducible across different production batches

Especially in 64-core or 128-core structures, even if each conductor individually meets specifications, amplified inter-channel variation can create visible imaging artifacts at the system level.

7. Hotten's Engineering Practice in ICE Cable Solutions

Hotten has long focused on the development and manufacturing of ultra-fine multi-core coaxial structures. These technical capabilities are systematically applied to ICE cable solutions.

Through continuous optimization of 42–50 AWG ultra-fine coaxial conductors, multi-core structural consistency, and dynamic bending reliability, Hotten achieves an engineering-level balance between signal integrity, channel consistency, and mechanical durability.

This enables ICE cable solutions to transition from prototype validation to stable mass production — delivering ultra-small dimensions, long mechanical life, and a well-balanced engineering solution.