WJ SUPERLIG®: Redefining Knee Ligament Repair with a Next-Generation, Coated Artificial Ligament

On April 9, 2025, Beijing Wanjie Medical Device Co., Ltd. marked a pivotal moment for orthopedic surgery with the NMPA approval of its WJ SUPERLIG® Artificial Ligament. As the first domestic product of its kind to be granted the “innovative medical device” designation in China, WJ SUPERLIG® is poised to set a new standard for the compensation and augmentation of knee cruciate ligament injuries.

The Solution: A Globally Pioneering Composite Coating

Traditional artificial ligaments have long struggled with a trifecta of clinical challenges: mechanical wear, suboptimal fixation strength, and poor biological integration. WJ SUPERLIG® was engineered to directly address these pain points through a globally pioneering composite coating technology. This innovative dual-zone coating strategy is the device’s core technical differentiator:

• For Soft Tissue Integration: A hydrophilic coating of grafted polystyrene sulfonate on the soft tissue contact zone significantly reduces fiber friction. This not only mitigates the risk of debris shedding—a common cause of post-operative irritation—but also actively promotes cell adhesion and tissue regeneration, facilitating a more natural healing environment.
• For Bone Fixation and Healing: The bone tunnel contact zone features a mineralized hydroxyapatite coating. This is a game-changer for fixation, boosting pull-out strength by an impressive 150%. Beyond mechanical stability, the coating’s continuous release of calcium and phosphorus ions activates osteoblasts, dramatically accelerating bone integration and ensuring the long-term success of the repair.

The Foundation: High-Performance Substrate

Underpinning the advanced coating is a high-tenacity polyester fiber (PET) base. Through a unique proprietary surface treatment, this substrate delivers outstanding anti-fatigue performance, ensuring the ligament can withstand the rigorous demands of high-intensity sports and provide lasting support for the patient’s active lifestyle.

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