Flexible Ointment Applicator with One-Way Valve for Precise Dosage
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Solution Overview
Problem
Ophthalmic ointments are difficult to apply accurately and can lead to contamination and excessive medication, as traditional metal or hard plastic tubes are prone to greasiness and lack dosage control.
Innovation Solution
A flexible applicator with a one-way valve and a pliant tip that allows controlled dispensing of ointment, featuring a holding chamber with a single entrance and exit, where deformation forces the ointment through the exit, preventing backflow and allowing precise application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional metal or hard plastic tubes are used for ointment application, then the structure is simple and easy to manufacture, but the application accuracy is poor and contamination occurs
Solution Approach 1:
The applicator is divided into distinct functional segments: a flexible holding chamber for storing ointment, a one-way valve mechanism for controlled entry, and a separate dispensing tip with channel. This segmentation allows each component to perform its specific function optimally while maintaining overall simplicity
Solution Approach 2:
The holding chamber is made from flexible material that can be deformed to control ointment flow. This flexibility enables precise dosage control through manual compression while maintaining a simple single-piece construction that is easy to manufacture
2Ease of manufacture
If traditional tubes are used, then manufacturing is simple, but the tip gets coated and greasy with excess ointment
Solution Approach 1:
The ointment storage function is extracted from the traditional tube structure and placed into a separate flexible holding chamber. The dispensing tip is designed with a channel that guides ointment flow, preventing it from coating the external surface of the applicator body, thus eliminating greasiness and contamination issues
Solution Approach 2:
The applicator is designed as a disposable device that can be manufactured simply from flexible material. After single use, it is discarded rather than cleaned and reused, eliminating the contamination problem inherent in reusable tubes while maintaining ease of manufacture through simple construction
3Measurement precision
If ointment is applied from traditional tubes, then no special mechanism is needed, but dosage cannot be regulated
Solution Approach 1:
The one-way valve automatically regulates ointment flow based on pressure differential - it opens when ointment enters the chamber and closes when dispensing pressure is applied. This self-regulating mechanism provides dosage control without requiring complex external control systems or multiple components
Solution Approach 2:
The flexible holding chamber allows the user to control the volume of ointment dispensed by varying the degree of compression applied. This simple parameter change (compression force) provides precise dosage control while adding minimal structural complexity
4Ease of operation
If excessive ointment is applied, then the medication is not harmful, but it is messy and bothersome
Solution Approach 1:
The one-way valve provides immediate feedback on ointment flow - it opens to allow entry and closes to prevent backflow or excessive dispensing. This automatic feedback mechanism ensures precise dosage control and prevents messy over-application, maintaining cleanliness during operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and mess-free application of ointment with controlled dosage, reducing contamination risks and simplifying the application process while maintaining hygiene.
Implementation Method 1
The housing is flexible such that deformation of the housing reduces capacity of the holding chamber and forces contents of the holding chamber to pass through the exit
Implementation Method 2
A one-way valve is at the entrance for allowing the ointment to enter the holding chamber through the entrance and restricting the ointment from exiting the holding chamber through the entrance
Data Source
AI summary
One applicator for use with ointment includes a housing defining a holding chamber. The holding chamber has a single entrance distinct from a single exit and is flexible such that deformation of the housing reduces capacity of the holding chamber and forces contents of the holding chamber to pass through the exit. A one-way valve is at the entrance for allowing the ointment to enter the holding chamber through the entrance and restricting the ointment from exiting the holding chamber through the entrance. A tip extends from the housing adjacent the exit. The tip has a proximal end meeting the housing and a pliant distal end spaced apart from the housing. The tip distal end is flared from the tip proximal end and has a generally planar leading surface. A channel in the tip extends from the exit to the leading surface, and is flared at the leading surface.