Thread Forming Tool Segmentation for Guided Bone Implant Placement

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Solution Overview

Problem

In guided implant surgery, implants tend to deviate from their planned position due to varying bone density, leading to jamming issues and inaccuracies, especially with implants that are wider at the coronal end, causing stress on surgical templates and affecting the placement of subsequent implants.

Innovation Solution

A combination of a guide sleeve, drill, and thread forming tool with a guide surface, where the thread forming tool has an apical portion with a smaller diameter than the drill and a coronal portion that is guided by the guide sleeve, allowing precise thread formation and implant placement, reducing deviations and stress on the surgical template.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a guide sleeve is used to guide the implant during placement, then the implant position accuracy is improved, but the implant may jam in the guide sleeve due to deviation caused by varying bone density

Engineering Contradiction:

Improveimplant position accuracyVSAvoidguidance reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The implant is divided into two functional sections: a guided section that passes through the guide sleeve for accurate positioning, and an unguided section that generates threads in the bone. This segmentation allows the implant to maintain guidance accuracy while avoiding jamming by separating the threading function from the guided section.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide sleeve acts as an intermediary that provides guidance only for the guided section of the implant. The sleeve allows the implant to be positioned accurately while permitting controlled deviation in the unguided section, thus mediating between the need for precision and the risk of jamming.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If the implant is wider at the coronal end to provide better stability, then the implant stability is improved, but there is insufficient space in the oral cavity to maintain guidance between the implant mount and surgical template

Engineering Contradiction:

Improveimplant stabilityVSAvoidguidance distance

Core Design Contradiction:

Stability of the object's compositionVSLength of moving object

Solution Approach 1:

The implant is segmented into a guided section with smaller diameter that passes through the guide sleeve, and an unguided section with larger diameter that provides stability and generates threads. This allows the stabilizing portion to be wider without compromising the guidance distance, as the wider portion does not need to pass through the limited space of the guide sleeve.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution moves the threading function from the guided dimension (through the sleeve) to the unguided dimension (in the bone), allowing the implant to have a wider coronal end for stability while maintaining adequate guidance distance through the smaller apical section.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Manufacturing precision

If threading is performed before implant placement to ensure proper fit, then the implant fit is improved, but the surgical template experiences stress and may deviate from the planned position

Engineering Contradiction:

Improveimplant fit precisionVSAvoidsurgical template stress

Core Design Contradiction:

Manufacturing precisionVSStress or pressure

Solution Approach 1:

The implant is segmented so that only the unguided section generates threads in the bone, while the guided section remains stress-free and maintains its precise relationship with the guide sleeve and surgical template. This prevents stress transmission to the template during threading.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The threading function is extracted from the guided section and assigned to the unguided section only. This separation removes the source of stress from the guided portion, preventing template deviation while still achieving proper implant fit through threading in the unguided section.

Inventive Principle:

Principle #2Taking out (Extraction)

4Productivity

If a single surgical template is used for multiple implant placements, then the surgical efficiency is improved, but the placement of subsequent implants is affected by deviations in previously placed implants

Engineering Contradiction:

Improvesurgical efficiencyVSAvoidsubsequent implant position accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

Each implant is segmented with a guided section that maintains its own independent guidance through the guide sleeve, isolating it from deviations caused by previously placed implants. This allows multiple implants to be placed using a single template while maintaining individual positioning accuracy for each implant.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9615894B2Components for guided threading of bone

Publication Date: 2017.04.11 NOBEL BIOCARE SERVICES AG

AI summary

A combination of a guide sleeve for a surgical template, a drill, and a thread forming tool is disclosed. The guide sleeve has a guide surface for guiding the thread forming tool. The drill has at least one cutting edge for cutting a recess in bone. The thread forming tool has a thread forming section for forming at least one thread in bone, and a guide section for guidance by the guide surface of the guide sleeve, the thread forming section comprising an apical portion, and a coronal portion. A maximum diameter of the apical portion of the thread forming section is smaller than or equal to a maximum diameter of the cutting edge of the drill.