Interpreting Manners’ Acoustic Enhancement Process

https://profed.olympuschina.com/gs/thoracicsurgery/12628/

A major challenge in EBUS procedures is visualizing the needle within the ultrasound image, especially during initial insertion or when the needle shaft approaches a shallow angle relative to the ultrasound beam. Polished metal causes specular reflection; if the reflected ultrasound misses the transducer's reception angle, the needle appears fragmented or vanishes entirely. Operators then rely on tactile feedback to estimate depth-elevating risks of vascular perforation or failed sampling.

Manners EBUS-TBNA needles overcome this by laser micro-machining "artificial acoustic scatterers" onto the needle shaft surface. Using nanosecond/picosecond fiber lasers, they ablate helical micro-grooves or annular dot matrices (width 20–50μm, depth 3–10μm) onto the outer tube surface. This disrupts the continuous metallic mirror, causing multiple internal reflections within the microstructures. The significantly amplified backscatter component manifests on the ultrasound monitor as a highly visible, continuous bright line-termed the "Lighthouse Effect"​ within the industry.

The advantage of the 5-axis laser system lies in maintaining constant linear velocity and consistent planar inclination across the cylindrical curvature. Helical grooves wrap the needle shaft with uniform pitch (typically 0.2–0.5mm), ensuring stable echo characteristics regardless of the needle's rotational orientation. The etched zone typically covers the functional 5–30mm segment behind the needle tip (excluding the extreme apex to preserve puncture strength); some models also feature marker rings on the proximal sheath for positional reference. Manners samples every production batch for testing within Tissue-Mimicking Phantoms (TMPs), measuring Contrast-to-Noise Ratio (CNR) against predefined minimum visibility thresholds before release.

It is crucial to note that excessively deep etching, while boosting echogenicity, could create stress concentration points. Manners utilizes Finite Element Analysis (FEA) simulations to define safe depth-to-width ratios, balancing echo gain with torsional strength. Furthermore, the electropolishing step subtly rounds etched edges-the process chain requires precise calculation ("Laser reserved depth − Electropolishing removal = Final functional depth"), reflecting the manufacturer's process capability. For distributors and end-users, selecting an EBUS-TBNA needle with a mature laser etching solution directly equates to enhanced puncture safety and a shortened learning curve.