3D-Printed Disposable Cutting Block for Stable Knee Bone Cuts

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Solution Overview

Problem

Existing cutting blocks for total knee arthroplasty face issues such as metal debris generation, instability, and high costs due to reusable metallic guides, which lead to cutting errors, implant loosening, and increased operational expenses.

Innovation Solution

A 3D-printed, disposable cutting block with modular attachment spikes, made from biocompatible materials like nylon or polyethylene, providing stability and rigidity, and allowing for single-use disposal to eliminate sterilization costs and improve surgical precision.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If reusable metallic cutting blocks are used, then structural strength and stability are improved, but metal debris is generated causing harmful effects

Engineering Contradiction:

Improvestructural strengthVSAvoidmetal debris

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent employs disposable cutting blocks made from biocompatible materials such as nylon or polyethylene that are discarded after single use, eliminating the problem of metal debris generation from reusable metallic blocks while maintaining adequate structural strength for the surgical procedure

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The cutting block utilizes composite material construction combining biocompatible polymers with reinforcing elements or metal inserts where needed, providing sufficient structural strength while avoiding widespread metal debris generation throughout the surgical field

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If 3D-printed disposable cutting blocks made from light materials are used, then cost and sterilization requirements are reduced, but stability and rigidity deteriorate

Engineering Contradiction:

Improvesterilization costVSAvoidblock stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The cutting block combines lightweight biocompatible polymers with strategic metal reinforcements or internal structuring to achieve the necessary stability and rigidity while maintaining the disposable nature and cost advantages of 3D-printed designs

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The cutting block features localized reinforcement at critical stress points through embedded metal inserts, 3D-printed structural geometries, or material property variations, providing stability where needed while keeping overall weight low and manufacturing simple

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If modular attachment spikes are added to the cutting block, then adaptability to different surgical methods is improved, but device complexity increases

Engineering Contradiction:

Improvesurgical method adaptabilityVSAvoidattachment system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The cutting block is divided into modular components with detachable attachment spikes or interfaces that can be selectively installed or removed based on the specific surgical procedure requirements, allowing adaptability without requiring a completely different block design for each method

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutting block incorporates universal attachment interfaces or standardized spike designs that can accommodate multiple surgical methods and implant types, providing versatility through a single standardized connection mechanism rather than multiple specialized interfaces

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260020865A1Cutting block

Publication Date: 2026.01.22 SMITH & NEPHEW INC

AI summary

A low-cost disposable. 3-D printed cutting guide. The cutting guide may be made with modular attachment spikes. The cutting guide may be provided in connection with a femoral trial for use in preparing a patient's bone to receive an implant.