Movable Bracket Arm Bony Screw for Distraction Osteogenesis

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Solution Overview

Problem

Current surgical screws and fasteners in dentistry and maxillofacial orthopedics require a strong holding plate bracket, leading to prolonged surgery time and recovery, and difficulty in passing a distractor bar through multiple brackets at different levels due to fixed shank designs, which are inadequate for weak teeth or short bone levels.

Innovation Solution

A bony screw with a movable bracket arm that includes a head with cruciform slots, a self-tapping tip, and a pivotally attached bracket arm allowing for adjustable support of a distraction osteogenesis bar, enabling easier fixation and passage through multiple levels without the need for a surgical flap.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a strong holding plate bracket is used to grip the traction bar, then the structural strength is improved, but the surgery time and recovery time are prolonged

Engineering Contradiction:

Improvestructural strengthVSAvoidsurgery time and recovery time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The bracket arm is made movable relative to the screw shank through a pivot connection, allowing the bracket to dynamically adjust its position during surgery. This enables easier passage of the distraction bar through multiple brackets at different levels while maintaining structural strength when needed.

Inventive Principle:

Principle #15Dynamics

2Ease of manufacture

If a fixed shank design is used, then the manufacturing simplicity is improved, but the ability to pass the distractor bar through multiple brackets at different levels is worsened

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidpassage of distractor bar through brackets

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If a tooth band bracket is used on weak teeth or short bone levels, then the applicability to more cases is improved, but the stability against distraction forces is worsened

Engineering Contradiction:

Improveapplicability to weak teeth or short bone levelsVSAvoidstability against distraction forces

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The movable bracket arm can be positioned optimally on weak teeth or short bone levels while maintaining stability through proper positioning. The pivot connection allows the bracket to adjust to the available anatomy without requiring strong underlying structures.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The position and orientation of the bracket arm can be adjusted by changing its angular position on the pivot, allowing adaptation to various anatomical conditions including weak teeth and short bone levels while maintaining adequate stability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10918463B1Bony screw with movable bracket arm

Publication Date: 2021.02.16 KING SAUD UNIVERSITY

AI summary

A bony screw with a movable bracket arm includes a head and a shank extending therefrom. The shank has an upper portion, a threaded lower portion adjacent to the upper portion, thereby defining a junction, and a self-tapping tip. An annular flange is disposed at the junction between the upper portion and the threaded lower portion of the shank, and is contiguous with respect to each of the upper and threaded lower portions, and has a peripheral surface with a diameter greater than a diameter of the head and greater than a diameter of the upper portion, thus defining a stop between the upper and threaded lower portions. A first end of a bracket arm is pivotally secured to the upper portion of the shank, and an opposed second end of the bracket arm defines a loop.