Official Release of Achievements

We conduct an in‑depth analysis of surface integrity systems engineering, the core post‑processing step for robotic surgical forceps jaws. Through a combined process of precision electropolishing and multi‑stage ultrasonic cleaning, we not only deliver a mirror‑like smooth finish to forceps jaws but also reshape their surface chemical state, physical morphology and energy characteristics at the microscale. This achieves ultra‑low friction coefficients, outstanding corrosion and adhesion resistance, and implant‑grade biological cleanliness for instruments, laying a robust surface foundation for long‑term, repeated sterilization and clinical use.

R&D Background and Key Pain Points

The surface of surgical instruments, especially reusable robotic forceps jaws, is critical to their long‑term reliability, safety and performance stability. Machined surfaces feature micro‑burrs, tool marks, lattice distortion in surface‑layer materials and embedded contaminants. These defects lead to four major risks: first, increased tissue friction, unsmooth operation and higher risk of tissue injury; second, hotbeds for bacterial biofilms and protein residues that are difficult to fully clean and disinfect, raising cross‑infection risks; third, current concentration and overheating on rough surfaces during electrocoagulation, exacerbating tissue adhesion and electrode wear; fourth, susceptibility to corrosion initiation at defective areas under harsh repeated high‑pressure steam sterilization. Conventional mechanical polishing may mask defects while introducing new contaminants. Therefore, a process that fundamentally improves surface integrity and achieves intrinsic cleanliness is required.

Core Technological Innovations

Our surface treatment is a finely regulated physicochemical process:

Precision ElectropolishingRather than simple electroplating, this involves controlled electrochemical dissolution. Forceps jaws are immersed in specially formulated electrolyte as anodes. Under precisely regulated voltage, current, temperature and duration, micro‑protrusions on metal surfaces exhibit higher current density and faster dissolution rates, while depressions dissolve more slowly. This peak‑selective dissolution effect smoothly removes several micrometers of surface material, eliminating machining marks and micro‑burrs to deliver surfaces with superior atomic‑level flatness.More importantly, this process forms a uniform, chromium‑rich passive oxide layer on stainless steel surfaces - a dense and stable core barrier against corrosion. For titanium alloy, a titanium dioxide layer is formed with excellent biocompatibility.

Multi‑Stage Ultrasonic CleaningFollowing electropolishing, multi‑pass ultrasonic cleaning using different solutions is performed. The workflow begins with alkaline detergent to remove grease, followed by deionized water rinsing, and finally high‑purity alcohol treatment or vacuum drying as needed.The key mechanism of ultrasonic cleaning is cavitation: high‑frequency sound waves generate countless microscopic vacuum bubbles in liquid that implode instantly, producing intense local impact forces and micro‑jets. These penetrate the tiniest crevices, hinge interiors and tooth gaps of forceps jaws to thoroughly strip residual electrolyte, metal particles and organic matter. This physical cleaning process causes no damage to base materials.

Surface Energy ModificationThrough process control, we adjust the hydrophilicity or hydrophobicity of final surfaces. For example, specific post‑treatment produces super‑hydrophilic or moderately hydrophobic surfaces, regulating the spreading and residue behavior of intraoperative tissue fluids on instruments to further reduce tissue adhesion.

Mechanisms of Action

The core mechanism of this process lies in optimizing three surface attributes: geometric morphology, chemical state and surface energy.Electropolishing first optimizes geometric morphology by transforming rough, multi‑peak surfaces into smooth, defect‑free ones, drastically reducing real contact area and mechanical interlocking effects during tissue contact, thereby lowering friction and tissue injury tendency. Meanwhile, it optimizes chemical state by generating highly chemically inert passive films that resist erosion from body fluids and disinfectants.Ultrasonic cleaning ensures absolute surface cleanliness by removing foreign particles that may trigger biological reactions. The resulting low (or controllable) surface energy prevents non‑specific firm adhesion of biomacromolecules such as proteins and bacteria.The synergy of the three elements creates a smooth, inert and clean biological interface, enabling instruments to exhibit low biological reactivity in the human body, ease of cleaning and sterilization, and long‑lasting stable performance.

Efficacy Verification

Surface profilometer tests show that surface roughness Ra values drop from above 0.4 μm to below 0.1 μm after electropolishing. Electrochemical tests (e.g., potentiodynamic polarization) confirm a positive shift in self‑corrosion potential, widened passivation zones and significantly enhanced pitting corrosion resistance.Bacterial adhesion tests (e.g., Staphylococcus aureus) demonstrate over 90 % reduction in bacterial attachment on treated surfaces. Simulated electrocoagulation experiments reveal over 50 % reduction in tissue adhesion weight for treated bipolar jaws.The strictest validation comes from cleaning verification and protein residue testing, with our products meeting stringent standards such as AAMI ST79. Feedback from hospital Central Sterile Supply Departments (CSSD) indicates our jaws are easier to clean with high visual inspection pass rates and slow performance degradation throughout their service life.

R&D Strategy and Philosophy

We believe: The quality of an instrument's surface determines how harmoniously it interacts with living organisms.Our strategy treats surface treatment as a core process equal in importance to precision machining, rather than an auxiliary post‑processing step. We invest in process R&D and equipment to precisely control every electropolishing parameter with the rigor of chemical reaction management. We regard ultrasonic cleaning as ultimate purification, adopting multiple procedures to ensure absolute cleanliness. Our goal is to build a perfect defense line at the microscale, enabling instruments to serve safely and reliably at the macroscale.

Future Outlook

In the future, we will advance from passive‑protection surfaces to active‑function surfaces. Cutting‑edge research directions include developing silver‑ion or copper‑ion‑doped surface modification technologies with long‑term antibacterial functions; designing smart coatings that automatically release anti‑adhesion agents during electrocoagulation; exploring the application of Slippery Liquid‑Infused Porous Surfaces (SLIPS) technology on forceps jaws to achieve near‑zero friction and tissue adhesion.We will also study the effects of surface micro‑nano structures on cellular behavior and develop bionic surfaces that promote targeted tissue healing. Our vision is to transform the surfaces of robotic surgical forceps jaws into programmable smart biological interfaces that engage beneficially with the human body.