Innovative Design and Experimental Research for a New Hand-mouth Separation Inhaler
Based on the difficulty of hand-mouth coordination and drug inhalation in the process of medication for asthma patients,a novel hand-mouth separation inhaler is designed.Firstly,the working principle of energy storage and negative pressure is proposed.The energy storage mechanism and negative pressure mechanism based on cam-lever-crank linkage mechanism are designed,and the degrees of freedom of these two mechanisms are calculated.Secondly,the hand-mouth separation inhaler is divided into the cam structure,the lever structure,the spring energy storage connecting rod structure,the negative pressure triggering structure and the drug loading structure.And the detailed structural design is carried out.Thirdly,the static force analysis of the energy storage spring and the valve core are computed,and it is obtained that the length of the lever arm in contact with the cam end is 23.5 mm,the rotating torque of the cam is 0.34 N·M and the radius of the valve core is 7 mm.Finally,the entire mechanical structure is designed,the operation convenience of the structure is tested by fuzzy evaluation method,and the accuracy of the inhaler is tested by image comparison method.The results show that the operation convenience of the device is excellent and the accuracy of the drug ejection reaches 99.05％,which could meet the needs of patients.
hand-mouth separation inhalerenergy storage and negative pressuremechanical system designstructural design
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