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What is Medical Plastics Injection Molding?


Medical plastics injection molding is a manufacturing process used to develop medical parts and components. Molten plastic material gets injected into a mold cavity at high pressure. It then cools and solidifies to create the intended shape.


This process is highly versatile and efficient and enables the production of parts that require tight tolerances. Key advantages include cost-effectiveness for high-volume production, high precision and accuracy, ability to use a wide range of medical-grade plastics, and compliance with strict medical industry standards and regulations.


Medical plastics injection molding is commonly used in the healthcare industry to manufacture items such as syringes, IV components, surgical instruments, medical device enclosures, and many other disposable and non-disposable medical products.


The choice of plastic material used in medical injection molding is crucial, as it must meet strict regulatory requirements for biocompatibility, sterilization, and chemical resistance. Additionally, manufacturing processes must adhere to stringent quality standards as the safety and effectiveness of medical devices produced through injection molding are critical.


Controlled Manufacturing Process


The injection molding process itself is a highly controlled manufacturing method that allows for tight tolerances, repeatability, and traceability — all critical for meeting FDA requirements.


  • Process parameters like temperature, pressure, and cycle times can be precisely set and monitored to produce consistent, high-quality parts.

  • Automated processes minimize human error and contamination risks.

  • Detailed production records can be maintained for traceability.


Material Selection and Control


FDA-compliant medical-grade plastics like PEEK, PE, PC, and LSR can be used, which meet biocompatibility and sterilization requirements. Strict control over incoming raw materials ensures only approved resins are used.


Cleanroom Manufacturing


Injection molding for medical devices is often done in controlled cleanroom environments to prevent particulate and microbial contamination, per FDA's current good manufacturing practices (cGMP) regulations.


Quality Management System


Injection molding facilities for medical devices must implement a robust quality management system (QMS) following ISO 13485 and 21 CFR Part 820 Quality System Regulation. This covers design controls, risk management, documentation, validation, and continuous improvement processes.


Regulatory Approvals and Audits


Medical injection molders must register with the FDA and undergo regular audits to verify cGMP and QSR compliance for the device classification (Class I, II, or III). ISO 13485 certification is widely accepted for demonstrating QMS requirements.

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