Rotating Lapidus Cutting Guide for Multi-Planar Bone Correction
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Solution Overview
Problem
Conventional Lapidus procedures require large incisions, leading to significant scarring, prolonged healing times, and infection risks, while existing devices limit multi-planar correction capabilities, affecting accuracy and repeatability.
Innovation Solution
A cutting guide system with a base body and rotationally coupled cutting slot block allows for multi-planar (sagittal, frontal, and transverse) bone corrections, enabling precise cuts through smaller incisions (around 3 mm) using a cutting slot block and reposition guides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional full exposure Lapidus procedure is performed with large incision, then complete exposure of first metatarsophalangeal joint is achieved, but scarring is significant, healing time is prolonged, and infection risk increases
Solution Approach 1:
The cutting guide is divided into modular components: a base body that attaches to bone and a separately rotatable cutting slot block. This segmentation allows the cutting guide to be fixed securely while enabling angular adjustments through rotation, achieving complete joint exposure through controlled access rather than large incision.
Solution Approach 2:
The cutting slot block is designed to rotate relative to the base body, providing dynamic adaptability for multi-planar corrections. This rotational capability allows the surgeon to adjust cutting angles in frontal and transverse planes without requiring large incisions for manual repositioning, thereby reducing scarring and infection risk while maintaining complete joint exposure.
2Ease of operation
If manual adjustments are made in frontal and transverse planes during traditional Lapidus procedure, then bone repositioning is achieved, but accuracy and repeatability of multi-planar corrections are limited
Solution Approach 1:
The cutting slot block rotates on a fixed axis relative to the base body, providing controlled dynamic adjustment for multi-planar corrections. This mechanical rotation system enables precise angular positioning in both frontal and transverse planes, significantly improving accuracy and repeatability compared to manual repositioning techniques.
Solution Approach 2:
The system changes the angular parameters of bone cutting by rotating the cutting slot block to different angles. This allows precise control over cutting angles in multiple planes, enabling accurate multi-planar corrections with repeatable positioning that overcomes the limitations of manual adjustment methods.
3Manufacturing precision
If rotating cutting slot block is used for multi-planar corrections, then precise angular adjustments are achieved through small incision, but device complexity increases
Solution Approach 1:
The cutting guide is segmented into a stationary base body and a rotatable cutting slot block. This segmentation isolates the rotational mechanism to a single component, reducing overall device complexity while maintaining precise angular adjustment capabilities for multi-planar bone corrections through small incisions.
Data Source
AI summary
A system includes a cutting guide having a base body configured to be fixed to a first bone of a patient and a cutting slot block configured to provide a guide for cutting at least one of the first bone and a second bone of the patient. The cutting slot block is rotationally coupled to the base body. The cutting slot block is configured to rotate in a first rotational direction. The cutting guide comprises a distal portion and a proximal portion.