Open Access

ARTICLE

Individualized Design of the Ventilator Mask based on the Residual Concentration of CO₂

by Zhiguo Zhang¹, Zhenxiao Li², Yifei Zhang³, Zhenze Wang⁴, Minzhou Luo¹

1 Jiangsu Key Laboratory of Special Robot Technology, College of Mechanical and Electrical Engineering, Hohai University, No. 200. Jinling North Road, Xinbei, Changzhou, 213022, China .
2 School of Mechanical Engineering, Changzhou University, No . 1. Gehu Road, Wujin, Changzhou, 213164, China.
3 School of Mathematics & Physics, Changzhou University, No . 1. Gehu Road, Wujin, Changzhou, 213164, China.
4 National Research Center for Rehabilitation Technical Aids, Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age Disability, Key Laboratory of Rehabilitation Technical Aids Technology and System of the Ministry of Civil Affairs, No . 1. Ronghuazhong Road, Beijing BDA, Beijing, 100176, China.

*Corresponding Author: Zhiguo Zhang. Email: .

Computer Modeling in Engineering & Sciences 2018, 117(2), 157-167. https://doi.org/10.31614/cmes.2018.04067

Abstract

OSAHS (Obstructive Sleep Apnea Hypopnea Syndrome) is a respiratory disease mainly characterized by limited and repeated pauses of breathing in sleep. Currently, the optimal treatment is to apply CPAP (Continuous Positive Airway Pressure) ventilation on the upper airway of the patient through a household respiratory machine. However, if the ventilator mask is designed improperly, it might cause the residue and repeated inhalation of CO₂, which will exert an adverse impact on the therapeutic effect. Present research numerically analyzed the CO₂ transportation inside a commercial ventilator mask (Mirage SoftGel, ResMed, Australia) based on the reconstructed 3D numerical model of a volunteer's face and performed the improved design of the ventilator mask in terms of the CO₂ residual concentration below the nostrils. The fluid dynamic analyses showed that at the end time of expiratory, the CO₂ residual concentration below the nostrils is close to 4%. To improve the therapeutic effect, we changed the position of the exhaust holes and found that by moving the exhaust holes to the bottom of the ventilator mask, the CO₂ residual concentration below the nostrils would be reduced to no more than 1%. This study established a near physiological computational model and provided a new method for the individualized design of the commercial ventilator mask.

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