To evaluate the performance of 450 ventilators in use in Zhejiang Province by systematically assessing the pass rates of core parameters across different brands and analyzing the correlation between service life and performance, thereby providing evidence for precise quality control and scientific maintenance.

In accordance with GB 9706.212—2020 and JJF 1234—2018, five key parameters (tidal volume, mandatory ventilation frequency, FiO₂, inspiratory pressure level, and PEEP) were tested using a Fluke VT650 gas flow analyzer. Descriptive statistics and Spearman rank correlation analysis were employed for systematic comparison and correlation analysis from the dimensions of brand type and service life.

The overall pass rate of the 450 ventilators was 58.67% (264/450). Significant disparities were observed in the pass rates of core parameters among brands: Imported Brand 2 had the highest overall pass rate (70.48%), while Domestic Brand 2 had the lowest (0.00%). Tidal volume exhibited the most notable variation in pass rates among brands (0%～90.75%), identified as the primary weakness of domestic devices. Correlation analysis between service life and performance revealed that Imported Brand 2 maintained stable performance with no significant correlation to service life (ρ=-0.094, P=0.157). In contrast, Imported Brand 1 (ρ=-0.382, P=0.001) and Imported Brand 3 (ρ=-0.446, P<0.001) showed significant negative correlations, while Domestic Brand 1 also demonstrated a weak negative correlation (ρ=-0.215, P=0.035).

The current overall performance of ventilators requires improvement, with tidal volume accuracy being a common technical bottleneck for domestic devices. Furthermore, performance degradation patterns over time vary significantly by brand. It is recommended to establish a differentiated quality control system focusing on tidal volume, incorporating service life and brand-specific characteristics, to enhance the clinical safety and whole-life-cycle management of ventilators.