1. Product Function and Ergonomic Design
The primary consideration in medical mold design is the functional realization of the final product. Designers must fully understand the usage scenarios and operating methods of medical devices to ensure that the molded parts perfectly meet medical functional requirements. Simultaneously, for products that come into contact with the human body, such as surgical instrument handles and prosthetic implants, ergonomic factors must be considered to ensure that the product's shape, size, and surface texture conform to human usage habits and anatomical structures.
2. Precision and Tolerance Control
Medical products typically have extremely high requirements for dimensional accuracy, especially instruments involving precision fitting or minimally invasive surgery. Mold design must consider factors such as material shrinkage and thermal deformation, using CAE analysis to predict potential deformation and compensate in advance. Dimensional tolerances for critical parts should be controlled within ±0.01mm or even higher precision, which places extremely high demands on mold processing.
3. Demolding and Ejection System Design
Medical products often have complex structures, potentially including undercuts, thin walls, deep cavities, and other difficult-to-demold structures. During the design phase, it is essential to appropriately set the draft angle (typically 1-3°) and scientifically arrange the ejection mechanism to prevent product deformation during demolding. For special structures, complex demolding mechanisms such as sliders and angled ejectors may be required to ensure smooth demolding without damage.
4. Runner and Cooling System Optimization
Medical products often use high-precision engineering plastics, which place strict requirements on melt flow and cooling during injection molding. The mold runner system should ensure uniform melt filling and avoid defects such as short shots and weld lines. The cooling system design must be balanced and efficient to ensure rapid and uniform cooling of the product, reducing internal stress deformation. For medical products requiring transparency or high gloss finish, the cooling system design is particularly critical.
