Centrifugal Deflection Device for Surgical Handpiece Debris Evacuation
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Solution Overview
Problem
Existing centrifugal deflection devices for surgical and dental handpieces do not effectively prevent foreign bodies from entering the handpiece, leading to contamination and damage, requiring complex and time-consuming cleaning and sterilization processes.
Innovation Solution
A centrifugal deflection device equipped with a rotating ring that creates a pressure gradient within an ejection chamber, expelling air and debris from the handpiece, preventing foreign bodies from entering and simplifying maintenance and sterilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centrifugal deflection device with an end cap and annular chamber is used to evacuate foreign bodies, then foreign bodies are prevented from entering the rear area of the handpiece, but debris still enters through the insertion opening and contaminates components within the annular chamber
Solution Approach 1:
The invention divides the handpiece into distinct zones: a clean zone (rear area with bearing) protected by the end cap, and a contaminated zone (annular chamber) where debris is expected. The pressure gradient creates directional airflow that segments the flow paths, directing debris toward evacuation openings while protecting the bearing area.
Solution Approach 2:
The pressure gradient acts as an intermediary mechanism between the rotating end cap and the debris particles. By creating a controlled pressure differential, the system mediates the interaction between rotational force and debris movement, channeling debris along predictable paths away from critical components.
2Reliability
If the handpiece components are designed to prevent foreign body entry, then contamination is reduced, but complex disassembly is required for complete sterilization
Solution Approach 1:
The invention extracts the evacuation function from the main handpiece body by using a separate, removable end cap assembly with integrated evacuation openings. This allows the evacuation system to be separated and sterilized independently, simplifying the overall sterilization process while maintaining protection of internal components.
Solution Approach 2:
The design accepts that the annular chamber will be contaminated during use and is optimized for easy removal and replacement. Rather than attempting to protect every surface, the system allows strategic contamination in replaceable areas while protecting critical components, enabling efficient sterilization through component replacement.
3Productivity
If airflow pressure decreases at the front of the handpiece to evacuate debris, then foreign bodies are drawn in through the insertion opening, but this creates a pressure gradient that can pull debris into the handpiece
Solution Approach 1:
The end cap is designed with asymmetric features: the outer flange has a larger rotational radius than the sleeve, creating higher circumferential speed and lower pressure at specific locations. The evacuation openings are strategically positioned to exploit this asymmetric pressure distribution, directing debris outward while minimizing inward flow through the insertion opening.
Solution Approach 2:
The invention addresses the pressure gradient problem by adding rotational motion as a new dimension. Instead of relying solely on axial pressure differences, the rotating end cap creates circumferential velocity and centrifugal forces that redirect debris laterally toward evacuation openings, converting a potentially harmful axial pressure gradient into a beneficial rotational flow pattern.
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 device effectively prevents foreign bodies from entering the handpiece, reducing the risk of contamination and damage, and facilitates easier cleaning and sterilization by using a pressure gradient to expel debris, enhancing the operational reliability and maintenance efficiency.
Implementation Method 1
creates a pressure gradient within an ejection chamber, expelling air and debris from the handpiece
Implementation Method 2
A centrifugal deflection device equipped with a rotating ring that creates a pressure gradient
Data Source
Figure 1
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Figure 4~5
AI summary
A centrifugal deflection device for equipping a surgical or dental handpiece (1) to prevent the penetration of foreign bodies resulting from an operation, this centrifugal deflection device comprising a ring (10; 10') rotationally coupled either directly or via a shaft (6) of a tool, to a drive shaft (8) of the handpiece (1), this device being characterized in that the ring (10; 10') is capped by a sleeve (12; 12') fixed to the front end of the body (8) of the handpiece (1) and which, together with the ring (10; 10'), defines an ejection chamber (11; 11'), this ejection chamber (11; 11') comprising an inlet communicating with a rear area of the handpiece and an outlet communicating with the external environment, the ring (10; 10') having a first diameter (D1; D1') at the outlet of the chamber ejection (11; 11'), and a second diameter at the level of the ejection chamber inlet (11;11'), the first diameter of the ring (10; 10') being greater than the second diameter of the ring (10; 10').;