IVRO Surgical Guide Curvilinear Shaft Clamping
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Solution Overview
Problem
Intraoral vertical ramus osteotomy (IVRO) procedures face challenges such as limited visualization, difficulty in judging the position of the lingua, and a high risk of complications like inadequate medial pterygoid attachment, inferior alveolar nerve damage, and vascular injuries due to inaccurate osteotomy techniques.
Innovation Solution
The development of an IVRO surgical guide featuring a curvilinear shaft with a hooked distal end and a cutting guide, along with a slidable component having a curved claw, allows for precise clamping and accurate placement of a trial cut along the mid-waistline of the mandibular ramus, thereby enhancing the precision and safety of the osteotomy procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional IVRO techniques are used, then the procedure is simple and quick, but the accuracy of osteotomy cuts is poor and neurovascular injuries occur
Solution Approach 1:
The surgical guide is divided into distinct functional components: a curvilinear shaft for positioning, a hooked distal end for engagement with the mandibular ramus, a cutting guide for accurate osteotomy, and a slidable component with curved claw for clamping. This segmentation allows each component to perform its specific function optimally while maintaining overall guide functionality.
Solution Approach 2:
The surgical guide is designed to be positioned and clamped onto the mandibular ramus before the osteotomy procedure begins. The hooked distal end engages with the ramus structure in advance, and the slidable component with curved claw secures the guide in the correct position, ensuring accurate cut placement before the actual cutting occurs.
2Illumination intensity
If traditional IVRO techniques are used, then the surgical procedure is fast, but visualization is limited and position judgment is difficult
Solution Approach 1:
The curvilinear shaft acts as an intermediary element that bridges the gap between the surgeon's external manipulation and the internal anatomical structures. It provides a visible reference structure that extends into the surgical field, allowing the surgeon to track the position and orientation of the guide relative to the mandibular ramus during the procedure.
Solution Approach 2:
The surgical guide replaces the need for complex manual positioning and visual estimation techniques. The mechanical features of the guide—such as the curved claw engagement and pre-positioned cutting guide—substitute for the surgeon's manual dexterity and visual judgment, providing more reliable and consistent positioning.
3Reliability
If traditional IVRO techniques are used, then no special equipment is needed, but the risk of neurovascular injuries is high
Solution Approach 1:
The surgical guide incorporates localized features designed to protect specific neurovascular structures. The curvilinear shaft and hooked distal end are shaped to engage with safe zones on the mandibular ramus, while the cutting guide is positioned to maintain adequate distance from the inferior alveolar nerve and vascular structures, creating local protective zones during the osteotomy.
Solution Approach 2:
The surgical guide is designed with built-in safety margins and protective features before the osteotomy begins. The pre-positioned cutting guide and clamping mechanism establish safe boundaries that cushion against accidental injury to neurovascular structures, preventing harm before it can occur during the cutting process.
Data Source
AI summary
Provided herein is an IVRO surgical guide for positioning a cutting guide on a mandibular ramus such that the mandibular ramus is clamped between a hooked distal end and a slidable component having a curved claw. The cutting guide is placed at a predetermined distance from the posterior edge of the ramus at the mid-waistline of the mandibular ramus along a curvilinear shaft in contact with the lateral surface of the ramus. The cutting guide can accommodate a saw for performing the osteotomy.