Tapered Pump Member With Guide For Uniform Nasal Spray Collapse
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Solution Overview
Problem
Conventional nasal administration devices for powdered medicine suffer from poor molding accuracy due to blow molding, leading to inconsistent spraying and unstable dispensing, as the pumps cannot be uniformly collapsed during use.
Innovation Solution
The device employs a pump member with a tapered shape manufactured by injection molding, guided by a cylindrical member to ensure uniform deformation, and includes a rod-like guide member to prevent sideward movement, ensuring consistent spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If blow molding is used to manufacture the pump, then manufacturing cost is reduced, but molding accuracy deteriorates leading to poor collapse uniformity
Solution Approach 1:
The patent changes the manufacturing method from blow molding to injection molding, which fundamentally alters the production parameters and achieves both cost reduction and improved molding accuracy. The injection molding process allows for better control of material flow, pressure, and temperature, resulting in more consistent pump dimensions and collapse characteristics.
2Manufacturing precision
If a tapered shape is adopted for the pump member to enable injection molding, then molding accuracy is improved, but the pump may tilt or fold during collapse
Solution Approach 1:
The patent introduces a guide member as an intermediary component that interacts with the tapered pump member during collapse. The guide member's inner surface provides contact points that constrain the pump's movement, preventing tilting and folding while allowing the tapered shape to maintain its molding accuracy advantages.
3Ease of operation
If the pump is pressed without guidance, then operation is simple, but the pump collapses non-uniformly depending on pressing position
Solution Approach 1:
The guide member serves as a mediator between the user's pressing action and the pump member. It provides a controlled interaction surface that ensures uniform collapse regardless of where the user presses, maintaining operational simplicity while improving spray consistency through reliable, repeatable collapse behavior.
Solution Approach 2:
The guide member creates equipotential conditions during pump collapse by providing symmetric contact surfaces that distribute forces evenly. This ensures that the pump collapses uniformly along its axis regardless of minor variations in pressing position, achieving reliable spray consistency.
Data Source
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AI summary
The present invention provides an administration device having a novel structure which is capable of evenly spraying, and thereby stably administering, an object to be administered, such as a powdered medicine, irrespective of who uses such device. The present device is a single-use type administration device 10 for administering a predetermined dose of an object to be administered, such as a powdered medicine, into a nasal cavity, etc. The administration device 10 comprises: a pump member 20 having a tapered shape as a whole, the pump member 20 being deformed when pressed so as to reduce its internal volume; and a cylindrical guide member 30 that is arranged on an inner side of the pump member 20, the guide member 30 guiding a portion that is to be deformed in the pump member. The pump member 20 has a shape that includes a tapered large diameter portion 21 and a tapered small diameter portion 22 which has a diameter smaller than the large diameter portion 21. A stepped portion 23 in which the degree of tapering changes at a midpoint of the tapered shape may be formed between the large diameter portion and the small diameter portion.