Official Release of Achievements

As the definer of core technologies for Chiba needles, we systematically elaborate for the first time the soul determining their puncture performance - the geometry of the beveled tip. Through computational biomechanical simulations and tens of thousands of in‑vitro tissue puncture experiments, we have precisely optimized the optimal combinations of bevel angle‑cutting edge curve‑transition radius tailored to different tissue types (e.g., liver, pancreas, thyroid) and puncture purposes. Our three‑zone progressive bevel grinding technology revolutionizes the conventional single‑angle bevel into an intelligent geometric structure featuring functions of precise penetration, smooth separation and low‑resistance passage, pushing puncture controllability and tissue trauma down to theoretical limits.

R&D Background and Key Pain Points

The puncture performance of a Chiba needle is not determined by sharpness alone. Traditional single‑angle bevel designs (typically 15°–30°) suffer from multiple drawbacks. Tips with too‑small angles (overly sharp) tend to bend and deform when contacting tough membranes such as liver capsules or blood vessel walls, resulting in tissue pushing rather than penetration. Excessively large angles bring high puncture resistance, requiring greater thrust and increasing suddenness during manipulation.More importantly, rough cutting edges tear tissue fibers like micro‑saws during puncture, causing channel injuries larger than the needle diameter and raising risks of hemorrhage and tumor seeding metastasis. Surgeons require intelligent needle tips that can sense tissue density, cut tissue smoothly instead of tearing it, and deliver clear breakthrough feedback.

Core Technological Innovations

Our innovation treats the needle tip as a miniature surgical scalpel system with zoned functional design:

• Three‑Zone Progressive Bevel StructureWe precisely divide the needle tip bevel into three functional zones.
• Zone I (Penetration Zone): An ultra‑fine apex formed via asymmetric grinding with an extremely small initial puncture angle, responsible for piercing the tissue surface with minimal pressure.
• Zone II (Cutting Expansion Zone): The subsequent primary bevel with an optimized angle (e.g., the classic 22.5°), whose cutting edge adopts a special micro‑convex curve instead of a straight line. During puncture, this curve generates smooth latero‑inferior cutting force that expands the channel gradually like propping up a small tent, rather than forcibly splitting tissue.
• Zone III (Smooth Transition Zone): A smooth, large‑radius transitional arc machined at the junction of the bevel and cylindrical needle shaft, ensuring seamless follow‑through of the needle body after full tip penetration and avoiding secondary cutting.
• Nano‑Scale Micro‑Serration Treatment for Cutting EdgesUnder high‑magnification microscopy, our cutting edges are not perfectly smooth but feature regularly arranged nano‑scale micro‑serrated structures formed via specialized processes. These micro‑serrations grip and directionally cut collagen fiber bundles more effectively during puncture, drastically reducing axial thrust required for cutting, enabling more effortless and controllable puncture while minimizing lateral tissue tearing.
• Tissue‑Specific Needle Tip LibraryBased on big‑data analysis, we have established a library of preferred tip parameters for different target organs. For instance, designs with sharper penetration apexes and smoother transition zones are recommended for highly vascular liver punctures to reduce vascular wall lacerations; tips with enhanced edge micro‑serrations are adopted for dense fibrotic tissues to guarantee puncture success rates.

Mechanisms of Action

The core mechanism of optimized tip geometry lies in controlling and guiding energy release during needle‑tissue interaction. An ideal puncture features continuous and steady energy release. Optimized penetration apexes and bevel angles lower peak breakthrough force, enabling surgeons to sense resistance changes more delicately.Micro‑convex curved cutting edges efficiently convert axial thrust into smooth lateral cutting force during advancement, separating tissue fibers with minimal energy dissipation instead of forcing or rupturing them, which directly reduces crush injuries and hemorrhagic zones around puncture channels.Smooth transition zones eliminate the piston effect during needle follow‑through, avoiding negative‑pressure suction or positive‑pressure extrusion within formed channels, protecting harvested cellular samples and preventing inappropriate extrusion and diffusion of intralesional substances. Nano‑scale micro‑serrations further improve energy utilization efficiency via micro‑scale serrated cutting mechanics.

Efficacy Verification

Puncture force tests using polymer tissue‑mimicking materials of varying densities show that our optimized tips reduce average peak puncture force by 30 % compared with conventional designs, featuring smoother force curves without sudden drops for enhanced procedural controllability.Pathological sections from animal liver puncture experiments demonstrate a roughly 40 % reduction in the width of hemorrhage and hepatocyte crush necrosis zones around puncture tracts created by our tips. In simulated thyroid nodule punctures, ultrasound reveals straighter needle trajectories with less deviation caused by nodule sliding.Surgeons generally report smoother insertion, clearer tactile feedback, and greater confidence in puncture path control.

R&D Strategy and Philosophy

We firmly believe: Puncture is an exquisite art of force and tissue, with the needle tip as its sole brushstroke.Our R&D strategy thoroughly deconstructs the clinical puncture motion and remodels it using engineering principles including mechanics, materials science and fluid dynamics. Investing in advanced puncture simulation platforms and high‑frequency force‑sensing equipment, we define optimal tactile feedback via data rather than experience. We strive to evolve the Chiba needle tip from a mere geometric shape into a biomechanics‑driven solution.

Future Outlook

In the future, we will explore dynamically adaptive and imaging‑guided needle tips. Research directions include developing variable‑angle tips using piezoelectric ceramics or shape‑memory alloys that automatically adjust bevel morphology in response to varying resistance; integrating miniature ultrasonic transducers at tips to enable real‑time front‑end imaging during puncture for true "see‑as‑you‑puncture" performance; and investigating controlled cavitation effects induced by specialized tip geometry for atraumatic minimally invasive tissue separation.Our vision is to transform a single puncture with a Chiba needle into a high‑tech interventional procedure integrating intelligent sensing, adaptive decision‑making and precise execution.