Ultrasonic Bone Surface Preparation for Joint Implant Stability
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Solution Overview
Problem
Existing methods for replacing artificial joints, such as hip and knee joints, face challenges with accuracy in cutting and preparing bone surfaces, leading to friction, wear debris, and bone absorption due to loose fits between implants and bones, which can cause pain and require repeated surgeries.
Innovation Solution
A method using an ultrasonic treatment device with a vibrating probe for cutting, reaming, and rasping bone surfaces to precisely prepare attaching surfaces for implants, reducing friction and wear by creating smooth, accurate interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a drill is used to cut the femur for stem attachment, then the cutting operation can be performed, but the accuracy of the cut surface is not high
Solution Approach 1:
The patent replaces the conventional mechanical drill cutting system with an ultrasonic vibration-based cutting system. The ultrasonic treatment device uses high-frequency vibrations to cut and prepare the bone surface, achieving superior cut surface accuracy and smoothness compared to traditional drilling methods, while eliminating the clearance and friction problems associated with drill-based preparation.
2Reliability
If the stem is attached with low cut surface accuracy, then the attachment operation can be completed, but clearance is present between the stem and bone causing friction
Solution Approach 1:
The ultrasonic treatment device replaces conventional mechanical reaming and rasping tools to prepare the bone surface. The ultrasonic vibrations create a precisely fitted surface that eliminates clearance between the stem and bone, thereby preventing friction and wear debris generation while ensuring long-term joint stability.
3Productivity
If conventional cutting methods are used, then the bone can be cut, but wear debris is generated due to friction between stem and bone
Solution Approach 1:
The patent substitutes ultrasonic vibration cutting for conventional mechanical cutting methods. This substitution maintains cutting efficiency while eliminating the generation of wear debris, as the ultrasonic process creates clean cuts and smooth surfaces without the friction-induced wear associated with traditional mechanical tools.
4Duration of action of stationary object
If the artificial joint loosens due to friction and bone absorption, then replacement surgery becomes necessary, but repeated surgeries increase patient burden
Solution Approach 1:
The ultrasonic treatment device creates precisely fitted bone surfaces that eliminate clearance and friction, preventing the bone absorption and loosening that lead to premature joint failure. This substitution of cutting methodology significantly extends the service life of the artificial joint and prevents the harmful biological reactions associated with poor fit.
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 method enhances the accuracy and longevity of artificial joint attachments by minimizing clearance and friction, reducing the likelihood of bone absorption and pain, and allowing for longer use without loosening.
Implementation Method 1
a step of cutting out at least one attaching surface of a bone constituting a joint, by use of a treating section disposed at a distal end of a probe of an ultrasonic treatment device and ultrasonically vibrated
Data Source
AI summary
A method for replacement arthroplasty of an embodiment is losing precise cutting and surface unevenness and performing the smoothening treatment to the part of the joint region which the component of the artificial joint attaches, using an ultrasonic treatment device, and exact processing can be performed, dimensional processing accuracy also becomes high, and bonding surfaces stick it without a crevice, and it controls generating of wear debris by friction.