Validation of Sterilization Process for Surgical Gloves

Industry:

Medical Devices / Healthcare

Validation Scope & Key Parameters

Sterilization Method: Gamma Irradiation
Applicable Standards: ISO 11137, ISO 11737-1 & 11737-2
Product Type: Single-use Surgical Gloves
Target Sterility Level: SAL 10⁻⁶
Validation Methodology: VDmax Dose Substantiation
Production Scale: Full commercial manufacturing loads
Regulatory Coverage: FDA, EU MDR, CE Marking

This case study focuses on the comprehensive validation of the gamma irradiation sterilization process for a global surgical glove manufacturer at a newly commissioned production facility. The objective was to establish a robust, compliant, and audit-ready sterilization cycle in accordance with ISO 11137 requirements.

The validation program included Installation and Operational Qualification (IQ/OQ) of irradiation systems, detailed bioburden assessment to identify worst-case contamination levels, and dose auditing using the VDmax25 approach. Sterility testing was performed on verification dose samples to confirm achievement of the required Sterility Assurance Level (SAL 10⁻⁶).

Client:

Global Surgical Glove Manufacturer (Confidential)

Objective:

To conduct comprehensive process validation of the gamma irradiation sterilization cycle for surgical gloves, ensuring compliance with ISO 11137 standards and regulatory expectations.

Background:

The client needed to validate the sterilization process for a newly established production site to:

  • Meet global regulatory requirements (FDA, EU MDR)

  • Ensure Sterility Assurance Level (SAL) of 10⁻⁶

  • Support CE marking and U.S. market entry

Challenges:

  • Tight project timeline to align with product launch

  • Lack of prior dose validation history for new glove material

  • Need to coordinate between manufacturing, QA, and external irradiation facility

Approach:

1. Installation & Operational Qualification (IQ/OQ):

  • Verified irradiation equipment setup, control system, and calibration

  • Reviewed facility utilities (power, shielding, automation)

2. Bioburden Testing:

  • Collected glove samples from multiple production batches

  • Measured microbial load on product surfaces

  • Identified worst-case microbial contamination level

3. Dose Auditing & Verification:

  • Calculated verification dose using the VDmax method

  • Exposed gloves to the verification dose

  • Performed sterility testing on 100 units as per ISO 11737-2

4. Performance Qualification (PQ):

  • Conducted 3 successful sterilization runs using full production loads

  • Used dosimeters and biological indicators to confirm dose uniformity and sterility

5. Documentation & Reporting:

  • Generated full Validation Master Plan (VMP)

  • Submitted validation summary report, dose mapping data, bioburden reports, and SAL justification

Results:

  • All sterility tests passed for the verification dose

  • Dose distribution within required range

  • SAL 10⁻⁶ achieved and validated

  • Validation completed 2 weeks ahead of schedule

  • Approved by internal QA and external notified body

Client Benefit:

  • Enabled rapid product registration in the EU and U.S.

  • Ensured patient safety and product quality

  • Reduced compliance risks with audit-ready documentation

  • Enhanced confidence in new site’s sterilization capability

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