Two-Position Handpiece Coupling Seal for Low-Friction Contamination Control
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Solution Overview
Problem
Conventional dynamic seals used in medical handpieces, such as microdebriders and drills, degrade over time due to constant contact with rotating driveshafts, allowing contaminants to penetrate and causing heat and efficiency losses during reprocessing and use.
Innovation Solution
A two-position handpiece coupling seal that engages with the handpiece housing in one position to prevent contaminants during reprocessing and disengages to freely rotate with the driveshaft during use, using biasing members and seals made from materials resistant to harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dynamic seal is used to protect the motor during reprocessing, then contamination prevention is improved, but seal degradation and heat generation worsen due to constant contact with the rotating driveshaft
Solution Approach 1:
The seal is designed to dynamically change its position and function based on operational state. During reprocessing, the seal engages with the housing to protect the motor. During operation, the seal disengages from the housing and rotates with the driveshaft, eliminating friction and degradation while maintaining contamination prevention through the second seal interface.
2Object-affected harmful factors
If a dynamic seal maintains constant contact with the driveshaft during rotation, then contamination prevention is improved, but friction and heat generation worsen
Solution Approach 1:
The seal transitions from a static contact configuration to a dynamic rotating configuration. The biasing member enables the seal to move axially, disengaging from the housing during operation to eliminate friction with the rotating driveshaft, while the second seal maintains the contamination barrier through rotational contact.
Solution Approach 2:
The seal is divided into two distinct seal interfaces: a first seal that engages with the housing for protection during reprocessing, and a second seal that contacts the driveshaft for contamination prevention during operation. This segmentation allows each seal interface to perform its specific function optimally without the drawbacks of constant contact.
3Object-affected harmful factors
If a seal engages with the handpiece housing to prevent contaminant passage, then protection during reprocessing is improved, but the seal creates drag on the driveshaft during operation
Solution Approach 1:
The seal's engagement with the housing is made dynamic rather than static. During reprocessing, the seal engages with the housing to block contaminants. During operation, the biasing member allows the seal to disengage from the housing, eliminating drag on the rotating driveshaft and restoring full motor efficiency while the second seal maintains the contaminant barrier.
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
Prevents contamination and heat generation, extending the seal's lifespan and maintaining motor efficiency by avoiding static contact with moving components during operation.
Implementation Method 1
a biasing member (50) biases the seal (32) against a surface (36) of the handpiece housing (30)
Implementation Method 2
the seal (32), via the seal edges (4) and (6), prevents contaminants from entering a motor of the device
Implementation Method 3
The constant contact between the seal (2) and the driveshaft (8) as the driveshaft (8) rotates at high speeds during use of the device causes degradation of the seal (2) overtime... Moreover, the friction created by the seal (2) against the driveshaft (8) during rotation of the driveshaft (8) creates drag on the driveshaft (8) thereby creating a great amount of heat
Data Source
AI summary
A two-position handpiece coupling seal is provided. The two-position handpiece coupling seal includes a neck disposed at a first end that is configured to receive an implement. The two-position handpiece coupling seal has a first seal disposed about the neck of the two-position handpiece coupling seal. The first seal is configured to engage with a surface of a housing of a handpiece that uses the two-position coupling seal in a first position. The two-position handpiece coupling seal has a second seal disposed about a bore of the two-position handpiece coupling seal at a second end of the two-position handpiece coupling seal opposite the first end. The bore is configured to receive a driveshaft and the second seal is configured to sealingly engage with the driveshaft when the bore receives the driveshaft.