Surgical Cutting Jig with Angulation Guide for Precise Osteotomy
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Solution Overview
Problem
Current surgical techniques lack precise guidance for controlled cutting of body portions, particularly in minimally invasive procedures, leading to challenges in forming desired cut shapes and determining cut depth and angle, which are critical for procedures like osteotomy.
Innovation Solution
A jig system is provided that includes an adjustable support structure, angulation assembly, and guide to control the movement of a cutting instrument, allowing for precise surgical cuts by defining predefined paths and angles, enabling controlled surgical cutting of body portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a freehand cutting instrument is used for minimally invasive osteotomy, then the joint is preserved, but the precision of the cut shape, depth, and angle cannot be controlled
Solution Approach 1:
A guide instrument is introduced as an intermediary between the surgeon's freehand cutting and the bone. The guide instrument includes a guide body with a guide opening that defines a predetermined cutting path, and a positioning member that contacts the bone to establish the correct position and orientation. This intermediary device enables precise control of cut shape, depth, and angle while maintaining the minimally invasive approach and joint preservation.
2Manufacturing precision
If a cutting guide is used for Lapidus fusion procedure, then cutting precision is improved, but joint stability is reduced and fusion is required
Solution Approach 1:
The invention extracts only the essential function of the cutting guide (providing predetermined cutting paths with precise control of shape, depth, and angle) while removing the requirement for joint fusion. The guide instrument enables precise osteotomy cuts that allow for realignment and fixation without sacrificing the joint, thus taking out the harmful aspect (joint fusion) while retaining the beneficial aspect (cutting precision).
3Object-affected harmful factors
If a minimally invasive approach is used without a cutting guide, then incision size is reduced, but the surgeon cannot objectively determine cut depth and angle
Solution Approach 1:
The guide instrument serves as an intermediary that provides objective measurement and control of cut depth and angle. The positioning member contacts the bone at specific anatomical landmarks to establish predetermined orientation, and the guide opening defines the exact cutting path. This eliminates the need for the surgeon to rely on subjective feel and experience, providing objective determination of cut parameters while maintaining small incisions for minimally invasive access.
4Reliability
If a crescentic cut is formed freehand, then joint preservation is achieved, but the procedure becomes time-consuming and requires significant experience
Solution Approach 1:
The guide instrument incorporates a positioning member with contact surfaces that are pre-configured to contact the bone at specific anatomical landmarks. This preliminary positioning action automatically establishes the correct orientation and position for the cutting instrument, eliminating the need for the surgeon to manually calculate and establish the complex crescentic geometry. The predetermined guide opening then directs the cut along the precise crescentic path, significantly reducing procedure time and the required surgical experience while maintaining joint preservation.
Data Source
AI summary
A jig for guiding a cutting instrument for controlled surgical cutting of a body portion of a patient may include an adjustable support structure configured for positioning relative to the patient, an angulation assembly coupled to the support structure, and a guide coupled to the support structure and spaced apart from the angulation assembly. The cutting instrument may include a driver and a cutting burr. The angulation assembly may be configured for receiving a distal portion of the driver therein and controlling angular movement of the cutting instrument about a central point defined by the angulation assembly in a plurality of planes orthogonal to one another. The guide may define an opening configured for receiving a proximal portion of the driver therein and controlling movement of the proximal portion of the driver along a first predefined path such that the cutting burr moves along a second predefined path.