Dose-controllable medium conveying structure, medium conveying method and micro-dose secretion pump

Abstract

The invention provides a dose-controllable medium conveying structure, a medium conveying method and a micro-dose secretion pump. The dose-controllable medium conveying structure comprises a dose output assembly, the dose output assembly comprises a first multi-way valve, a second multi-way valve and a cavity, a sealing piece is connected in the cavity, a first cavity space on one side of the sealing piece and a second cavity space on the other side of the sealing piece are independent of each other through the sealing piece, and the size of the first cavity space and the size of the second cavity change along with movement or deformation of the sealing piece. The direction of an external medium entering the dose output assembly is controlled by controlling the conduction directions of thefirst multi-way valve and the second multi-way valve; and through the pressure of the medium entering the first cavity space / the second cavity space, the sealing piece moves or deforms, the second cavity space / the first cavity space is extruded, and the medium in the second cavity space / the first cavity space is discharged. According to the invention, the effect of one-time dose delivery can be accurate, and the dose delivered for one time cannot be changed due to the influence of external factors.

Description

technical field [0001] The invention relates to the field of medium delivery, in particular to a dose-controllable medium delivery structure, a medium delivery method and a micro-dosage secretion pump. Background technique [0002] The traditional medium delivery method is to transmit the medium from the back end of the pipeline to the front output by applying pressure through a pump and other pressurizing equipment at the back end of the pipeline. The amount of the medium to be transported can be calculated by the sensor installed on the pipeline. However, in the field of small-dose or even micro-metered medium delivery, due to the very small amount of medium, the delivery method through back-end pressurization and control faces the situation that the output is difficult to control. [0003] Taking insulin injection as an example, the patent document CN101137408 discloses a portable mechanical insulin injection device, which mentions that for the sake of accuracy, manual ro...

AI Technical Summary

Problems solved by technology

[0004] Compared with the traditional technology mentioned above, this method has the same place in that the dose control is performed at the back end. In the actual operation process, there are many difficult influencing factors in this back-end control method, such as external Vibration, shaking of the human body itself or difficulty in controlling the rotation angle, thermal expansion and contraction caused by ambient temperature affecting the accuracy of the screw, etc., may lead to uncontrollable front-end output doses

Therefore, the output dose of similar products currently on the market can only be calculated in units of hours, and the cumulative output dose cannot be accurately calculated for a single injection.

[0005] At the same time, this design can only inject a dose of more than 0.05ul at a time even under the current most precise screw, making it difficult to achieve a smaller level of dose delivery

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