Medical infusion equipment testing according to ISO 8536-4
Performance and safety testing of single-use gravity feed infusion sets for medical use according to ISO 8536-4. Measurlabs offers the following tests from the standard:
Particulate contamination: Ten infusion sets are flushed with filtered distilled water under laminar flow conditions, and the eluate is vacuum filtered through a 0.45 µm membrane. Particles are counted microscopically and classified into three size categories (25–50 µm, 51–100 µm, and >100 µm, with respective weighting coefficients of 0.1, 0.2, and 5). A blank control is run simultaneously, and the blank-corrected contamination index must not exceed 90.
Efficiency of the fluid filter: The fluid filter is tested using an aqueous suspension of latex particles (20 ± 1 µm diameter, approximately 1000 particles per 100 ml). The test suspension is passed through the filter, and the effluent is collected on a membrane filter. Retained latex particles are counted microscopically at ×50 to ×100 magnification across a minimum of 50% of the grid squares. The retention rate, calculated as the proportion of particles retained relative to the total particle count in the test fluid, must be at least 80%.
Chemical tests on the extract: A test solution is prepared by circulating 250 ml of grade 1 or grade 2 water through three infusion sets for 2 hours at 37°C. A blank control solution is prepared identically without infusion sets. The solutions are tested for the following parameters:
Reducing (oxidizable) matter: Titrimetric determination using potassium permanganate; the difference in Na2S2O3 consumption between the test and blank solutions must not exceed 2.0 ml.
Metal ions: Colorimetric assessment and/or AAS; total barium, chromium, copper, lead, and tin must not exceed 1 µg/ml, and cadmium must not exceed 0.1 µg/ml.
Titration acidity or alkalinity: Titration with NaOH or HCl using Tashiro indicator; no more than 1 ml of either titrant shall be required to reach the grey endpoint.
Residue on evaporation: Gravimetric determination after evaporation and drying at 105°C; total dry residue must not exceed 5 mg per 50 ml of extract.
UV absorption: Scanning spectrophotometry from 250 to 320 nm relative to the blank; absorbance must be below 0.1 across the wavelength range.
For information on other tests described in ISO 8536-4, please contact our experts using the form below.
- Suitable sample matrices
- Single-use infusion sets with a gravity feed
- Required sample quantity
- Depends on the selected tests, e.g., 12 pieces for particulate contamination (10 for testing, 1 as retention sample, 1 for pretest), 3 pieces for fluid filter efficiency (2 tested, 1 retention)
- Available quality systems
- Accredited testing laboratory
- Standard
- Method expert
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