Quality Control And Testing Standards For Chiba Needle Tips
Jul 04, 2026
From ISO 7864 to YY/T 0285 Performance Evaluation Systems
https://radiopaedia.org/articles/chiba-needle
As a single-use sterile invasive device, the quality of the Chiba needle tip is directly linked to patient safety and diagnostic effectiveness. International (ISO) and Chinese (YY/YB) standard systems have clear testing requirements.
Geometric Parameter Testing of the Tip
Bevel angle and edge length: Measured by projector, tolerance typically ±2° (based on 25°), edge symmetry deviation <0.05 mm.
Tip diameter/tip radius: No visible burrs or abnormal protrusions; micro-rounding value within process specifications.
Lumen patency: Verified by wire passing or airflow/liquid flow method to ensure no blockage.
Puncture Force (Sharpness) Testing
Using a material testing machine, the needle tip penetrates a standard simulated membrane (polyurethane or silicone, calibrated for thickness/hardness) vertically at a specified speed (typically 100 mm/min), recording the peak force at breakthrough. Peak forces of the same batch of Chiba needles should be within a defined range (e.g., 21G Chiba needle <0.5 N typical); exceeding the upper limit indicates dullness, while too low suggests an overly thin edge prone to damage.
Strength and Rigidity
The needle tip is pressed vertically against a rigid plane with an axial load (e.g., 5–10 N depending on specification); after unloading, observe for permanent deformation, rolled edges, or cracking.
Three-point bending tests on the whole needle verify tube rigidity, ensuring no accidental uncontrolled bending during deep puncture.
Surface Quality and Cleanliness
100% visual inspection at 40×–100× magnification, SEM sampling for micro-edge condition.
Particulate contamination, protein residue, and EO residue testing must meet YY/T 0616 and ISO 10993 series requirements.
Microbiology and Sterile Barrier
Finished products undergo sterility testing and bacterial endotoxin testing; packaging undergoes accelerated aging and simulated transport validation.
When procuring, suppliers should be asked to provide tip puncture force reports, geometric parameter COAs, and batch sterility certificates - important criteria for selecting quality Chiba needle brands.
