Saliva Ejector Sleeve with Air Conduits for Backflow Prevention
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Solution Overview
Problem
The existing saliva ejectors used in dental procedures face challenges with backflow of fluids and contaminants from the suction line, which can lead to cross-contamination between patients, due to the decrease in vacuum pressure when patients close their lips around the ejector tip, and the time-consuming and costly process of cleaning or replacing the suction line after each patient.
Innovation Solution
A backflow prevention mechanism is introduced, featuring a sleeve with air conduits on the saliva ejector shaft that allows air to enter the mouth even when lips are closed, maintaining suction and preventing backflow by positioning the sleeve between the patient's lips and the saliva ejector, ensuring continuous vacuum operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suction line is cleaned or replaced after every patient, then cross-contamination is prevented, but time and cost increase significantly
Solution Approach 1:
The suction line is divided into two separate components: a reusable suction line and a disposable sleeve that fits over it. The sleeve is replaced after each patient while the suction line remains in place, eliminating the need to clean or replace the entire suction line assembly after every patient.
Solution Approach 2:
A disposable sleeve is introduced that fits over the suction line and is discarded after each patient. This inexpensive, single-use component prevents cross-contamination without requiring time-consuming cleaning or replacement of the main suction line infrastructure.
2Ease of operation
If the patient closes lips around the ejector tip, then natural suction behavior is maintained, but vacuum pressure decreases causing backflow
Solution Approach 1:
The sleeve acts as an intermediary component between the patient's lips and the suction line. It includes an open end that allows air to enter the mouth while maintaining the vacuum seal, and a closed end that prevents backflow of fluids into the suction line, thus mediating between the patient's natural behavior and the vacuum pressure requirement.
Solution Approach 2:
The sleeve provides different functions at different locations: the open end allows air intake to maintain vacuum pressure, while the closed end prevents backflow. This local differentiation of functionality resolves the contradiction between allowing lip closure and maintaining vacuum pressure.
3Reliability
If the suction line is rinsed with germ killing rinse, then contamination is reduced, but rinse residue may backflow into the patient's mouth
Solution Approach 1:
The disposable sleeve replaces the need for chemical rinsing. By discarding the sleeve after each patient, any potential residue from cleaning solutions cannot backflow into the patient's mouth, eliminating the harmful effect while maintaining contamination prevention.
Solution Approach 2:
The sleeve is removed and discarded after each patient, extracting any potential contaminants or rinse residue from the system before they can backflow into the patient's mouth. This physical removal eliminates the problem of harmful residue backflow.
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
This solution effectively prevents backflow of bodily fluids and contaminants into the patient's mouth, accommodating the natural tendency to close lips during suction, thereby reducing the risk of cross-contamination and eliminating the need for frequent suction line cleaning or replacement.
Implementation Method 1
The inner surface is configured to fit over and frictionally engage the shaft of the saliva ejector. At least one longitudinal bore extends through the shaft wall between the first end surface and the second surface to provide a passageway for air.
Implementation Method 2
Suction is applied via a suction line to evacuate the material from the patient's mouth and to discharge the evacuated material to a waste container.
Implementation Method 3
The decrease in magnitude may allow the previously evacuated fluid remaining in the suction line to flow backwards into the patient's mouth.
Data Source
AI summary
The system and method disclosed herein prevent a patient from interrupting the vacuum created by the vacuum line attached to the saliva ejector so that suction continues to be present even if the patient clamps his or her lips tightly about the shaft of the saliva ejector. In the illustrated embodiment, the backflow prevention mechanism includes a sleeve positionable on the shaft of the saliva ejector and engageable by the patient's lips. The sleeve includes at least one conduit that remains open to allow air to enter the patient's mouth even when the patient's lips are tightly closed. The air entering the patient's mouth via the at least one conduit enables the vacuum line to continue to draw bodily fluids and contaminants from the patient's mouth.