Segmented Surgical Guide Body for Multi-Angle Bone Fixation
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Solution Overview
Problem
Existing guide bodies for osteosynthesis, such as those using Kirschner wires, are limited by requiring parallel insertion and inability to attach bone fragments not reachable by wires, leading to longer wire lengths and reduced stability, especially in osteoporotic bones.
Innovation Solution
A guide body with internally threaded openings and a multilayer wire grid structure allowing for three-dimensional fixation element placement at various angles, combined with additional holes for suture fixation, enabling direct bone contact and reduced wire length, and a connecting piece for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a corrugated guiding device is used to guide Kirschner wires, then the device structure is simple, but the fixation elements can only be passed through parallel and longer wire lengths are required
Solution Approach 1:
The guide body is divided into multiple separate plates, each with specific opening configurations. This segmentation allows each plate to be optimized for specific insertion angles and positions, enabling versatile three-dimensional fixation element placement while keeping individual plate structures relatively simple
Solution Approach 2:
The invention transitions from a single-plane corrugated structure to a multi-plate three-dimensional arrangement. By stacking multiple plates at different orientations and positions, the system enables fixation elements to be inserted at various angles and locations, resolving the limitation of parallel-only insertion while maintaining structural simplicity through modular design
2Device complexity
If Kirschner wires are used for fixation, then the guiding device structure is simple, but bone fragments not reachable by wires cannot be attached
Solution Approach 1:
The guide body system serves multiple functions: it guides Kirschner wire insertion through precisely configured openings, provides additional holes for suture attachment to bone fragments, and enables both wire and suture fixation methods. This multi-functionality resolves the limitation of being unable to attach bone fragments not reachable by wires, while maintaining relatively simple device structures
3Ease of manufacture
If the guiding device has a corrugated structure, then the device is easy to manufacture, but the device does not rest directly on the bone requiring greater wire lengths
Solution Approach 1:
The guide body is segmented into multiple thin plates rather than a single thick corrugated structure. This allows the plates to be stacked closely together, enabling the assembly to rest directly on the bone surface with minimal gap, thereby reducing the portion of wires not in contact with bone while keeping individual plates simple to manufacture
Solution Approach 2:
The design transitions from a single three-dimensional corrugated structure to a two-dimensional stacked plate configuration. This allows the guide body to conform closely to the bone surface, minimizing the distance between the guide and bone, thereby reducing the non-contact portion of fixation elements while maintaining manufacturing simplicity through flat plate fabrication
4Device complexity
If fixation elements are inserted parallel to each other, then the guiding device structure is simple, but the stability of osteosynthesis is reduced
Solution Approach 1:
The invention arranges openings in multiple plates at different orientations and positions, enabling fixation elements to be inserted at various angles in three-dimensional space rather than parallel in a single plane. This three-dimensional crosswise positioning of wires and pegs significantly enhances osteosynthesis stability by distributing fixation forces across multiple planes, while the modular plate design keeps the guiding structure relatively simple
Data Source
AI summary
A guide body is designed to receive longitudinal fixation elements such as wires nails, pegs or screws which are to be anchored within bone. The guide body includes a top surface, a bottom surface, and a number of openings connecting the top surface with the bottom surface. The central axes of at least two of the openings are transverse to each other. The guide body permits the insertion of fixation elements at various angles with respect to each other. The guide body may prevent fixation elements which extend into the intramedullary region or the spongiosa from being displaced either in the proximal or in the distal direction.