What are the requirements for setting up a production line for endotracheal tubes

Endotracheal tubes are classified as Class II sterile, non-active medical devices. The construction of the endotracheal tube production line comprises six major modules: cleanroom infrastructure, process equipment, utility systems, personnel systems, regulatory compliance, and environmental protection and safety.

 

1. Cleanliness Class
Areas for final cleaning, assembly, balloon welding, and initial sealing/packaging: Class 300,000 cleanroom (ISO 14644-1 Class 9).
Extrusion and rough processing may be located in a general area; however, once the extruded tubing enters the clean zone, all subsequent processes must take place in a Class 300,000 environment.

 
2. Workshop Layout (Strict separation of personnel and material flows)
- Material flow path: Raw material warehousing → General processing area (extrusion) → Buffer/de-packaging → Class 300,000 clean zone (tube cutting, tip forming, hole punching, printing, balloon welding, cleaning, assembly, inner packaging) → Sterilization and outer packaging area → Finished product warehouse.
- Personnel flow: Entry into the clean zone via changing rooms (primary change, secondary change, air shower); provision of separate rooms for cleaning sanitary fixtures and tools/equipment.
- Pressure differential: Clean zone relative to the outside ≥10 Pa; pressure difference between rooms of different cleanliness grades >5 Pa; installation of pressure differential gauges required.
- Temperature and humidity: 18–28°C, relative humidity 45%–65%; self-leveling epoxy flooring; no dust-accumulating dead corners.
- Area reference: Total workshop area for one standard production line ≥800–1,200 m²; clean zone area ≥450 m² (including inspection and buffer areas).

 

 

Main Production Line Equipment
1. Medical catheter extrusion line (PVC co-extrusion with radiopaque line): Main extruder, cooling water bath, haul-off unit, laser diameter gauge, and in-line cutter
2. Tip forming/thermal shaping machine: Thermal sealing/forming of smooth, beveled catheter tips
3. Murphy eye/inflation hole punching machine (thermal punching)
4. Ring/mark pad printing machine: Printing of depth markings and vocal cord lines
5. Cuff (balloon) high-frequency welding machine (includes airtightness testing fixture)
6. Inflation valve assembly fixture
7. Ultrasonic cleaning line (purified water cleaning for internal and external tube surfaces)
8. Drying tunnel (air blow-off and heat drying)
9. Manual/semi-automatic assembly station
10. Sterile inner packaging sealing machine (blister or pouch packaging)

 
Testing Equipment (100% inspection)
Cuff pressure retention/leakage test, catheter kink resistance test, Go/No-Go dimensional gauges, and spot checks for wall thickness
Downstream Sterilization (Outsourced or In-house)
Ethylene Oxide (EO) sterilization; in-house setup requires a dedicated sterilization isolation zone, aeration area, and residual gas testing room (most SMEs outsource sterilization to third parties)

 

 
1. Purified Water System
Purified water equipment (resistivity ≥ 0.5 MΩ·cm) is required for cleaning in the clean zone; a 304/316 stainless steel piping loop system must be used; water quality testing records must be maintained for each shift; production capacity must match the water consumption of cleaning stations.
2. Compressed Air Purification System
Air used in the clean zone must undergo drying, three-stage precision filtration, and oil/dust removal; activated carbon filtration is required for air sources in direct contact with the product; air storage tanks must be drained regularly.
3. Power Supply
UPS backup power is recommended for critical systems (purification HVAC, water generation, sterilization); the workshop requires reliable overall grounding and anti-static measures; estimated power load: 120–180 kW per production line.
4. Waste Gas and Wastewater Treatment
VOC waste gas from extrusion and pad printing ink processes requires collection and activated carbon adsorption; pretreatment is required for cleaning wastewater and purified water concentrate; hazardous waste (waste ink, spent activated carbon, organic solvent-contaminated rags) must be stored in a dedicated hazardous waste storage room and disposed of by a qualified entity; this is a mandatory requirement for EIA (Environmental Impact Assessment) approval.

 

 
1. Key Personnel
- Quality Manager: Background in a medical device-related field; familiar with ISO 13485 and GMP for sterile medical devices.
- Production Manager & Technical Engineer: Knowledgeable in extrusion and catheter thermal processing techniques.
- Dedicated Inspectors (physicochemical testing, preliminary sterility testing, in-process inspection, finished product release).
- Cleanroom Operators: Training on cleanroom conduct and microbiological control prior to assuming the role; annual health check-ups.
2. Comprehensive Quality System Documentation
Quality Manual and procedure documents; complete process documentation (Standard Operating Procedures/SOPs, process flow charts, raw material standards, finished product technical requirements per YY/T 0337); traceability records (batch details, raw material lot numbers, in-process inspection records, sterilization records); ISO 13485 system and GMP for sterile medical devices.

 

 
1. Business License Scope of Operation: Manufacturing of Class II medical devices.
2. Product Registration Certificate (Class II): Tracheal tube product registration (processing time: 12–24 months).
3. Medical Device Manufacturing License (issued by the Provincial Medical Products Administration); mass production and sales may only commence after passing the on-site GMP inspection.
Workflow: Cleanroom facility construction → Quality management system establishment → Sample trial production + Type testing + Biocompatibility testing → Product registration → Manufacturing license inspection → Official production launch.

 

- Raw materials: Medical-grade non-phthalate PVC granules (or silicone material), barium sulfate radiopaque agent, cuff film, one-way inflation valve, Luer connector.
- Packaging materials: Medical-grade dialysis paper/composite film (packaging materials compatible with EO sterilization); suppliers must possess complete qualifications.

  

 
- PVC: Extrusion molding and high-frequency welding for the cuff; lower equipment investment; the mainstream choice in the domestic market.
- Silicone tubes: Extrusion or compression molding and heat-bonded cuffs; requires silicone compounding and vulcanization processes; higher investment; requires a dedicated production line.
- Reinforced (spring-embedded) endotracheal tubes: Requires an additional spring-winding co-extrusion unit; significantly higher process complexity.