Dental Anesthetic Buffer Assembly with Spiral Mixing
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Solution Overview
Problem
Current dental anesthetic injection methods are painful due to the acidic pH of numbing solutions like lidocaine, which do not effectively buffer the anesthetic during injection, leading to stinging sensations and delayed anesthetic action.
Innovation Solution
A dental anesthetic buffer assembly that incorporates a solid pH-raising buffer, such as sodium bicarbonate, which dissolves and mixes with the anesthetic during injection using a standard dental syringe, reducing acidity and enhancing the anesthetic effect by ionizing molecules and producing carbon dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standard dental syringe is used to inject anesthetic, then the injection can be administered efficiently, but the acidic pH of the anesthetic causes stinging pain and delayed anesthetic action
Solution Approach 1:
The buffer is pre-loaded into the buffer holder in solid form before injection. When the anesthetic fluid passes through the buffer holder, the buffer dissolves and mixes with the anesthetic in real-time, raising the pH and reducing stinging pain without requiring pre-mixing of buffer and anesthetic outside the syringe system
Solution Approach 2:
The buffer holder with spiral threads acts as an intermediary device between the syringe and patient. The spiral threads create turbulence that enhances mixing of the buffer with anesthetic, and the buffer itself serves as a chemical intermediary that neutralizes acidity and produces carbon dioxide to reduce pain and accelerate anesthetic action
2Object-affected harmful factors
If buffer is pre-mixed with anesthetic prior to injection, then pH is raised and pain is reduced, but additional mixing steps and equipment are required
Solution Approach 1:
The buffer holder is designed to integrate directly onto the syringe needle mount, merging the buffering function with the existing injection system. The buffer, mixing chamber, and injection pathway are combined into a single assembly that attaches to standard syringes, eliminating the need for separate mixing equipment or procedures
Solution Approach 2:
The system uses the kinetic energy of the anesthetic fluid being injected to drive the mixing process. The spiral threads passively create turbulence as fluid flows through, and the buffer dissolves automatically upon contact with the anesthetic, requiring no external power source or additional manual mixing steps
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
The buffer assembly significantly reduces injection pain and accelerates the anesthetic's effect by neutralizing acidity and facilitating immediate action on nerve cells, providing a painless and efficient delivery of the anesthetic.
Implementation Method 1
a solid pH-raising buffer that advantageously dissolves into and mixes with the anesthetic during injection
Implementation Method 2
the buffer reaction with the anesthetic produces carbon dioxide, which adds to the anesthetic effect
Implementation Method 3
The buffer holder has a spiral thread disposed around an inside wall of the buffer holder so as to swirl the injection fluid around the solid buffer and more readily dissolve the buffer and mix it with the injection fluid
Data Source
AI summary
A dental anesthetic buffer assembly advantageously attaches to carpule-loaded syringe in the same manner as a standard disposable needle. The dental anesthetic buffer assembly, however, incorporates a pH-raising buffer that advantageously dissolves into and mixes with the carpule anesthetic during injection, in lieu of pre-mixing the buffer and anesthetic prior to injection.