Electrostatically driven multi-media soft pump

The electrostatically driven soft pump, with its three-electrode structure and single-layer electrode encapsulation, solves the problems of media compatibility and high driving voltage, achieving stable pumping of various biological fluid media and low driving voltage, making it suitable for biomedical and wearable devices.

CN122407520APending Publication Date: 2026-07-17SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-19
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing soft pumps based on the HASEL principle suffer from poor media compatibility, high driving voltage, and insufficient safety. They are incompatible with biological fluid media such as water, saline, and cell culture medium, and the driving voltage is as high as 4000V, posing safety hazards and making them unsuitable for biomedical and wearable devices.

Method used

It adopts a three-electrode structure, which alternately switches the polarity of the upper and lower electrodes. Combined with a closed hydraulic chamber and a one-way valve structure, it achieves physical isolation between the driving medium and the conveying medium. It also uses a single-layer electrode encapsulation to reduce the thickness of the insulation layer, reduce the electrode spacing, and use a driving voltage of less than 650V.

Benefits of technology

It enables stable pumping of various non-conductive media, broadening its application scope to biomedical and wearable devices, reducing safety hazards of driving voltage, and is suitable for sensitive scenarios.

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Abstract

The application provides a multi-medium soft pump driven by electrostatic force, which comprises a middle electrode, upper and lower surfaces of which are connected with flexible electrode sheets and shells in sequence, and the shells are provided with through holes and liquid injection channels; the through holes extend upward and downward and penetrate through the middle electrode, and the liquid injection channels are communicated with the through holes; the shells are open at end faces corresponding to the flexible electrode sheets, and cavities for containing conveying medium are formed between the shells and the corresponding flexible electrode sheets; a driving medium is arranged in a hydraulic cavity formed by the two flexible electrode sheets and the middle electrode; and four one-way valves are arranged for pumping the conveying medium into or out of the corresponding cavities, two one-way valves are arranged on each shell, and when one of the one-way valves is in an open state, the other one-way valve is in a closed state; when a potential difference is formed between the middle electrode and one of the flexible electrode sheets, the potential of the other flexible electrode sheet is equal to that of the middle electrode. The application realizes physical isolation of the driving medium and the conveying medium.
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