A compact, durable knottying trainer designed for teaching, observation, and assessment of selfoperation skills. Crafted from materials, this model supports a wide range of knotting techniques and simulated scenarios for structured practice and evaluation. Key benefits Focused skill development: Enables repeated practice of essential knottying techniques to build manual dexterity and confidence in controlled training settings. Realistic simulation: Magnetic tissue tension, parallel elastic strips that mimic blood vessels, and replaceable simulated vessels reproduce the feel of different tissue and vessel conditions. Versatile and efficient: Multiple cylinder configurations create varied knotting spaces, allowing transition between tight, deep, and oblique working angles without bulky equipment. Durable and maintainable: materials and an easytodisassemble design support frequent use and rapid reconfiguration for different training goals. Core functions and performance Supports onehanded knotting, instrument knotting, surgical knotting, false knotting and recognition, small space knotting, large oblique space knotting, and thread trimming. Enables blood vessel clamping, cutting, and knotting training with replaceable simulated blood vessels for repeated scenarios. Three types of cylinders form multiple knotting spaces to challenge trainees with different depths and angles. Unique magnetic elements simulate tissue tension to improve the realism of knot security and handling. Practical attributes Material: Constructed from , wearresistant materials for longterm classroom and laboratory use. Design: Compact footprint for easy storage and transport; components are simple to disassemble and reassemble for quick setup changes. Modularity: Replaceable vessel elements and interchangeable cylinders let instructors tailor difficulty and focus to specific learning objectives. Use scenarios Skills lab training: Instructors can set up timed exercises for residents or students to practice instrument and handtied knots under observation and assessment. Selfdirected practice: Trainees can rehearse deepspace knotting and thread trimming techniques using different cylinder configurations to simulate confined operative fields. Assessment and competency testing: The model provides repeatable conditions for evaluating knot quality, false knot recognition, and manual consistency across trainees. What makes it stand out Combines realistic tactile elements with a compact, easytoconfigure design to deliver practical, repeatable training without complicated setup. Replaceable simulated vessels and multiple knotting spaces allow progressive training from basic to advanced scenarios. Built for frequent use in teaching and assessment environments where consistency and modularity are important. This trainer is intended for technical skills practice and evaluation in educational and laboratory settings, offering a practical, adaptable platform for knottying skill development.