Official Release of Achievements

Manners Technology has successfully overcome the industry‑wide challenge of firmly joining metal cannulas and plastic components (e.g., seal valve seats, tip sheaths) in disposable trocars. Through advanced precision injection molding technologies, we achieve molecular‑level bonding strength and seamless physical connection between dissimilar materials. Our products completely eliminate adhesive bonding, removing hidden risks of detachment and leakage. This ensures overall structural integrity and reliability of trocars under high‑pressure pneumoperitoneum and frequent instrument manipulation, redefining the anatomical construction of trocars.

R&D Background and Key Pain Points

Disposable trocars are typical metal‑plastic composite devices. Conventional assembly methods mostly rely on adhesive bonding or mechanical snap‑fits. Adhesive joints suffer from aging and incompatibility with disinfectants, and may fail after long‑term storage or intraoperative exposure to blood and tissue fluid, resulting in gas leakage or component separation. Mechanical snap‑fits may leave micro‑gaps that become hard‑to‑clean dead spaces, and plastic fatigue fracture may occur under stress from frequent instrument insertion and withdrawal.These connection weaknesses act as potential Achilles' heels that compromise surgical safety and cause intraoperative anxiety among surgeons. The market demands a truly integrated, flaw‑free bonding solution.

Core Technological Innovations

Our core innovation lies in precision injection molding technologies of overmolding and insert molding.First, stainless steel cannulas that have undergone full machining, electrolytic polishing and cleaning are precisely positioned as precision inserts inside injection molds. Molten medical‑grade plastics (such as ABS, nylon and polycarbonate) are then injected under high pressure into mold cavities, tightly wrapping pre‑designed grooves, knurling or micro‑holes on metal parts. After cooling, the plastic not only mechanically locks the metal but also interlocks with micro‑textures on the metal surface at the microscopic level.By precisely controlling plastic shrinkage rate, mold temperature and injection pressure, we ensure joint areas are free of sink marks and weld lines, delivering a smooth transition from metal to plastic as if formed in one single piece.

Mechanisms of Action

This technology operates through the synergy of mechanical interlocking and micro Van der Waals force bonding.Firstly, precision pre‑engineered structures on metal components (e.g., grooves, holes, roughened surfaces) provide anchor points for flowing plastic, forming robust mechanical locks after solidification. Secondly, high‑temperature and high‑pressure molten plastic makes intimate contact with clean metal surfaces. At extremely close distances, intermolecular Van der Waals forces are fully activated to form extensive secondary bonding.This bonding method avoids adhesive aging and stress concentration points of snap‑fit connections. The final structure is monolithic, with joint strength often higher than that of the plastic substrate itself, guaranteeing absolute stability under repeated torsion, insertion‑withdrawal cycles and pneumoperitoneum pressure.

Efficacy Verification

We have conducted rigorous validation tests. Tensile tests show that the pull‑out force of metal‑plastic joints exceeds more than five times the maximum force encountered in actual clinical use. No loosening or visible cracks occur at joints after fatigue tests simulating 100,000 instrument insertion‑withdrawal cycles. In high‑pressure airtightness tests, zero leakage is achieved at pressures far above standard surgical pneumoperitoneum levels (over 30 mmHg). Long‑term clinical follow‑up also records zero reports of intraoperative accidental gas leakage or component loosening for products adopting this structure, winning high trust from operating room nurses and surgeons.

R&D Strategy and Philosophy

Our philosophy: True reliability comes from eliminating all connection weaknesses.For medical devices, especially pressure‑bearing and movable components, we regard any non‑integrated connection as a potential risk source. Therefore, our R&D strategy pursues optimal structural design and inherent physical safety. Leveraging the flexibility and high precision of injection molding processes, we integrate functions of multiple components and materials into an inherently robust monolithic unit, trading process complexity for ultimate simplicity and reliability in clinical use.

Future Outlook

In the future, we will explore more complex multi‑material integrated molding. For example, we will research one‑shot molding combining soft silicone seal valves with rigid plastic valve seats to achieve superior airtightness and tactile performance. We will also investigate bonding between biodegradable biomaterials and metals, paving the way for fully absorbable trocars.Our goal is to evolve trocars from "assembled products" into "grown‑integrated products", where every component appears naturally fused together, providing surgeons with intuitive, trouble‑free instruments that perform as an extension of their hands.