Bone Harvesting Device with Pivotable Saw for Minimally Invasive Extraction

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Solution Overview

Problem

Current bone harvesting techniques for autogenous bone grafting are invasive, traumatic, and associated with significant morbidity, including pain, blood loss, and prolonged surgery time, while alternative non-autogenous bone products have unpredictable results and delayed fusion times, posing risks of disease transmission and requiring additional surgical sites.

Innovation Solution

A bone harvesting device with a rotatable drilling mechanism and pivotable cutting means that allows for precise extraction of cylindrical bone blocks, minimizing tissue damage and enabling immediate use in grafting procedures, reducing the need for additional surgical sites and foreign materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional bone harvesting techniques are used to obtain autogenous bone grafts, then the quality and reliability of bone grafting is improved, but the invasiveness and morbidity increase significantly

Engineering Contradiction:

Improvebone graft reliabilityVSAvoidsurgical morbidity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts only the necessary cylindrical bone core from the iliac crest using a trephine drill, rather than removing large bone blocks through traditional open surgery. This selective extraction maintains bone graft reliability while minimizing soft tissue disruption, blood loss, and postoperative morbidity associated with conventional harvesting techniques.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an intermediary containment system (the harvesting device with cavity and cap) that mediates between the drilling process and bone removal. The device captures the drilled bone core within its cavity and secures it with a cap, allowing for minimally invasive retrieval of the bone graft through a small incision without requiring extensive surgical exposure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If traditional bone harvesting methods are employed, then sufficient bone material can be obtained, but the surgical time and procedure complexity increase

Engineering Contradiction:

Improvebone material quantityVSAvoidsurgery time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The harvesting device is segmented into distinct functional components: a trephine drill for bone core extraction, a cavity for containing the bone core, and a cap for securing the core. This segmentation allows each component to perform its specific function efficiently, reducing overall surgical time while ensuring adequate bone material is obtained and preserved.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The device performs preliminary actions by pre-configuring the cavity and cap system before bone harvesting. The cavity is prepared to receive the bone core, and the cap is positioned to secure it, allowing for rapid bone retrieval and containment without requiring time-consuming manual manipulation during the surgical procedure.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If non-autogenous bone products are used instead of autogenous bone, then the surgical complexity is reduced, but the fusion time and reliability decrease

Engineering Contradiction:

Improveharvesting device complexityVSAvoidbone fusion time

Core Design Contradiction:

Device complexityVSDuration of action of stationary object

Solution Approach 1:

The harvesting device is designed to be self-contained and self-operating, requiring minimal external manipulation. The trephine drill automatically captures the bone core within the cavity as it drills, and the cap secures it without requiring additional surgical steps. This self-service capability reduces harvesting device complexity and surgical time while maintaining the benefits of autogenous bone with optimal fusion times.

Inventive Principle:

Principle #25Self-service

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 device facilitates efficient, minimally invasive bone harvesting with reduced morbidity, enabling faster fusion times and eliminating risks associated with non-autogenous bone products, while providing autogenous bone for immediate use in dental and orthopedic surgeries.

Implementation Method 1

means for drilling into bone, the drilling means being rotatable about its longitudinal axis

Methodology Applied

Scientific EffectRotational motion:

Implementation Method 2

cutting means pivotable relative to said drilling means about a pivoting axis substantially parallel to said longitudinal axis of said drilling means

Methodology Applied

Scientific EffectPivoting motion:

Data Source

PatentUS8920423B2Bone harvesting device

Publication Date: 2014.12.30 LEE BENJAMINO KAH HUNG

AI summary

A bone harvesting device is disclosed as including a drill body for drilling into bone, the drill body being rotatable about its central longitudinal axis, and a saw pivotable relative to the drill body about a pivoting axis parallel to the central longitudinal axis of the drill body, the drill body including a cavity which opens at a lower open longitudinal end of the drill body, and the saw being pivotable relative to the drill body between a first position in which the saw is clear of the lower open longitudinal end of the drill body and a second position in which the saw blocks part of the lower open longitudinal end of the drill body.