Implant Fixture Remover With Opposing Threads
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Solution Overview
Problem
Current methods for removing dental, plastic surgical, and orthopedic implant fixtures from human bones are inefficient, often requiring excessive bone destruction and prolonged treatment times due to the inability to apply sufficient torque without damaging the fixture or surrounding bone tissue.
Innovation Solution
An implant fixture remover with a remover screw and driver system that applies a strong removing torque of up to 1000 Ncm, minimizing bone damage by using a coupling screw with a thread direction matching the fixture and a separating screw with an opposite thread direction, along with a torque ratchet connection for efficient removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a tool for removing the fixture with sufficient torque (100-500 Ncm) is provided, then the fixture can be removed without great bone destruction, but such a tool was not previously available causing the bone to be greatly destroyed
Solution Approach 1:
The remover screw is divided into two distinct screw portions: a first screw portion with a first thread direction for engaging the fixture, and a second screw portion with a second thread direction (opposite to the first) for engaging the remover driver. This segmentation allows the single tool to perform both fastening and removal functions with different torque requirements, enabling safe fixture removal without bone destruction.
2Productivity
If the bone around the fixture is cut out to remove the fixture, then the fixture can be removed, but the bone is greatly lost and another bone transplanting operation is required
Solution Approach 1:
The invention changes the critical parameter of thread direction to enable torque reversal. By having the second screw portion's thread direction opposite to the first screw portion's thread direction, the remover driver can apply removing torque in the opposite direction to loosen and remove the fixture without damaging the surrounding bone tissue, thus eliminating the need for bone cutting or transplantation.
3Object-affected harmful factors
If the operation is made complex to avoid bone destruction, then bone safety is improved, but the treatment time is elongated and convenience is reduced
Solution Approach 1:
The remover screw serves multiple functions: it can be screwed to the fixture to apply fastening torque during implantation, and later the same tool can be used with the remover driver to apply removing torque for fixture removal. This multi-functionality eliminates the need for separate surgical procedures for bone reconstruction, thereby reducing treatment time while preventing bone damage.
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
Enables safe and rapid removal of damaged fixtures without cutting surrounding bone, reducing treatment time and preventing bone loss, allowing for immediate re-implantation and bone regeneration.
Implementation Method 1
a remover screw (10) having one end in which a thread coupled to the fixture is formed and the other end in which another thread is formed so as to separate and remove the fixture
Implementation Method 2
A removing torque necessary to screw off the implant fused to the bone is about 100 to 500 Ncm
Implementation Method 3
a close coupling portion formed at the lower end of the separating screw portion and coming in frictional contact with the upper outer surface of the fixture
Data Source
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AI summary
An implant fixture remover is provided which includes: a remover screw including a coupling screw portion screwed to a female screw portion of a fixture, and a separating screw portion formed to extend from one end of the coupling screw portion to the outside of the fixture and having a thread formed on the outer circumferential surface thereof; and a remover driver including a separating female screw portion into and to which the separating screw portion of the remover screw is inserted and screwed and in which a thread corresponding to the separating screw portion is formed in the inner circumferential surface thereof, a close coupling portion formed at the lower end of the separating female portion 22 and coming in frictional contact with the upper outer surface of the fixture, and a shank which extends upward from the separating female screw portion and in which a fastening tool is connected to the outer circumferential surface of one end thereof.