Multilobed Dental Implant Screwdriver Tip Design
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Solution Overview
Problem
Existing screwdrivers for dental implantology struggle to efficiently screw prosthetic screws into angled holes without causing damage due to limited access angles and localized stress, and require specific types of screws and joining elements, restricting their applicability to standard implant screws.
Innovation Solution
A screwdriver with a specially configured tip featuring a multilobed bulb and a joining element with a multilobed seat, allowing engagement at various tilt angles up to 40°, ensuring stable contact and preventing damage, while being compatible with standard screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the screwdriver tip is flattened to allow inclination at various angles, then the screwdriver can be positioned at tilt angles up to 40°, but the contact surface with the screw seat becomes narrow causing localized stress that could damage the screw seat
Solution Approach 1:
The screwdriver tip is divided into multiple lobes (typically three) that can independently engage with the screw seat. Each lobe acts as a separate contact point, distributing the applied force across multiple areas rather than concentrating it at a single flattened contact surface, thus preventing localized stress damage while maintaining angular flexibility
Solution Approach 2:
The lobes of the screwdriver tip are designed with rounded, curved surfaces that conform to the curvature of the screw seat recesses. This curved geometry allows the lobes to maintain continuous contact with the screw seat across a range of tilt angles while distributing load through the curved surface area, preventing stress concentration at flat contact points
2Ease of operation
If a hemispherical seat with spherical joining element is used to allow rotation at various tilt angles, then the screwdriver can be positioned at different angles, but the device requires specific types of screws and joining elements, reducing compatibility with standard implant screws
Solution Approach 1:
The screwdriver tip with its multilobed structure is designed to be universally compatible with both specialized angled prosthetic screws and standard implant screws. The same multilobed tip geometry can engage with the corresponding multilobed recesses in different screw types, allowing a single screwdriver design to perform multiple functions across different screw specifications without requiring type-specific tools
Solution Approach 2:
The invention maintains a consistent multilobed geometric parameter set across different screw and screwdriver combinations. By standardizing the number of lobes, their angular spacing, and their dimensional proportions, the system creates a universal engagement interface that works across multiple screw types while preserving the ability to operate at various tilt angles
3Ease of operation
If the tip is multilobed with rounded shapes to engage in the screw seat at inclined positions, then the screwdriver can operate at angled positions, but the tip becomes particularly flattened reducing the contact surface area
Solution Approach 1:
The tip is segmented into multiple distinct lobes rather than being a single flattened surface. This segmentation creates multiple discrete contact zones that collectively provide sufficient contact area while allowing the tip to be inclined at angles up to 40 degrees relative to the screw axis
Solution Approach 2:
The contact surface is distributed across multiple lobes arranged in a three-dimensional configuration around the screwdriver axis. This spatial distribution in multiple dimensions maintains effective contact area even when the overall tip geometry is flattened to accommodate angular positioning, as the lobes extend in different radial directions
Data Source
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AI summary
The invention is a screwdriver (100) for dental implants, comprising a shank (110) and a tip (120) comprising, starting from the shank (110), a connecting part or neck (140) and a terminal part or bulb (150). The longitudinal cross section of said bulb (150) has a substantially ogival or ellipsoidal compound shape, meaning that it comprises, starting from the portion (141) that connects it to said neck (140), a first substantially spherical portion (155) without spherical caps and an apex (154) in an elongated rounded shape joined to said first portion (155). The present patent also concerns a screw (300) suited to be used with said screwdriver (100) and a joining element (200) suited to be used in combination with said screwdriver (100) to tighten a screw.