Computer-Assisted Cranioplasty with Real-Time Implant Resizing

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Solution Overview

Problem

Current cranioplasty techniques using hand-molding and on-table manipulation of materials like titanium mesh and PMMA result in suboptimal cosmesis, prolonged operative times, increased anesthesia and blood loss, and higher morbidity due to the challenges of predicting and reshaping implants for precise fit in complex cranial reconstructions.

Innovation Solution

A computer-assisted surgical system that uses trackable elements and detectors to update orientations of computer-readable reconstructions of the patient's anatomy and implants, allowing for real-time visualization and precise resizing of customized craniofacial implants during surgery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If hand-molding and on-table manipulation techniques are used for cranioplasty, then material availability and ease of use are improved, but operative time and manufacturing precision deteriorate

Engineering Contradiction:

Improveease of useVSAvoidprecision of implant fit

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The implant is pre-fabricated with precise geometry based on preoperative CT scans and 3D reconstruction before the surgical procedure. This preliminary manufacturing action allows the complex shaping to be done with high precision equipment outside the operating room, while only requiring simple placement and minor adjustments during surgery.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The implant is created as a precise digital copy of the required anatomical structure through 3D reconstruction from CT scans. This digital model is then manufactured with high precision, eliminating the need for manual shaping during surgery and ensuring accurate fit without requiring complex intraoperative manipulation.

Inventive Principle:

Principle #26Copying

2Adaptability or versatility

If on-table manipulation is used for shaping implants, then adaptability to unknown defect sizes is improved, but operative time and anesthesia exposure worsen

Engineering Contradiction:

Improveadaptability to defect sizeVSAvoidoperative time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates real-time tracking and detection capabilities that allow the pre-fabricated implant to be dynamically adjusted and repositioned during surgery to achieve precise fit. The computer-assisted system provides dynamic feedback to guide minor modifications while maintaining the overall pre-planned geometry.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If pre-fabricated customized implants are used, then manufacturing precision and cosmesis are improved, but device complexity and intraoperative resizing difficulty worsen

Engineering Contradiction:

Improveprecision of implant shapeVSAvoidcomplexity of resizing process

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The complex manual resizing process is replaced with a computer-assisted system that uses detectors and trackable elements to guide precise modifications. The system substitutes manual judgment and artistic shaping with automated detection and guidance, reducing the complexity of the resizing task to following computer-guided instructions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The computer-assisted surgical system acts as an intermediary between the pre-fabricated implant and the surgeon. It provides real-time feedback and guidance through detected locations and orientations, mediating the resizing process to make it more straightforward while maintaining high precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Adaptability or versatility

If artistic reshaping with handheld bur is used, then adaptability to actual tumor resection deformity is improved, but operative time and morbidity worsen

Engineering Contradiction:

Improveadaptability to resection deformityVSAvoidmorbidity

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system incorporates real-time tracking and detection capabilities that provide continuous feedback during the resizing process. This feedback mechanism allows the surgeon to make precise adjustments based on actual measured deviations from the planned implant geometry, ensuring optimal fit while minimizing unnecessary manipulation and associated morbidity.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12268607B2Computer-assisted cranioplasty

Publication Date: 2025.04.08 JOHNS HOPKINS UNIVERSITY

AI summary

Provided is a surgical method. The method includes detecting a location of a reference unit having a trackable element with a detector, the detector configured to provide at least one signal corresponding to a detected location of at least the reference unit's trackable element; accessing a computer-readable reconstruction of the being's anatomy; accessing a computer-readable reconstruction of an implant; detecting a location of a pointer tool comprising a trackable element with the detector, where the pointer tool is associated with a location of an anatomical feature of interest; accessing at least one computer-readable reconstruction of a trace, the trace corresponding to a geometry of the anatomical feature of interest; and superimposing the at least one updatable, computer-readable trace on the second computer-readable reconstruction of the implant.