The residual liquid removal structure and method in eye dropper

By designing a residual liquid removal structure in the eye dropper, residual medication and water film are removed using fluid dynamics principles, solving the problems of waste and bacterial growth, and achieving complete utilization of the medication and cleanliness of the drop column.

CN115531082BActive Publication Date: 2026-03-06ZHANGJIAGANG ZHONGHUI MEDICAL PLASTIC TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202211127539.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-16
Publication Date
2026-03-06
Estimated Expiration
2042-09-16

AI Technical Summary

Technical Problem

Existing eye drop dispensers have difficulty effectively removing residual medication and water film after use, leading to waste and bacterial growth.

Method used

A residual liquid removal structure was designed, including a drip column, an annular sealing gasket, and a liquid outlet. By inverting the drip device and squeezing the bottle, the liquid is collected on the annular sealing gasket. Pushing the annular sealing gasket downwards, the liquid is expelled from the liquid outlet and air is expelled to form a low-pressure state. After the bottle is released, the air flows back to remove residual liquid and water film.

Benefits of technology

This method achieves complete utilization of the medicine, avoids waste, and prevents bacteria from growing in the droplet column due to prolonged exposure to air.

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Abstract

This invention discloses a residual liquid removal structure and method for an eye dropper, comprising: a bottle body, a dropper shell, a dropper column, and an annular sealing gasket. The dropper shell is connected to the bottle body and has a flow channel. An outlet is located at the top of the flow channel, and an annular sealing gasket is located at the connection between the outlet and the flow channel. The dropper column is located within the flow channel of the dropper shell, and includes a T-shaped section and a conical section. The conical section passes through the annular sealing gasket and the outlet and extends outward from the dropper shell. The inner ring of the annular sealing gasket is sealed to the outer wall of the conical section. Several guide grooves are evenly distributed on the dropper column. The advantages of this invention are: after dispensing, releasing the bottle body pushes the liquid film adhering to the conical section of the dropper column and the liquid suspended at the end of the conical section away from the conical section, allowing it to be dispensed into the user's eye without waste. Furthermore, it keeps the conical section exposed to air dry, thus preventing bacterial growth.
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