Cable Retaining Insert for Bone Plate Angular Stability
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Solution Overview
Problem
Existing bone plate assemblies for fracture fixation lack versatility and stability, particularly in providing angular stability and preventing bone anchor pull-out during cerclage wiring techniques.
Innovation Solution
A cable retaining insert designed to be used in conjunction with a bone plate, allowing for angular stability of the bone anchor without the need for a separate bone anchor in the hole, and providing a mechanism for guiding cerclage wires while compressing bone fragments through a ramped recess, enhancing fixation and healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a separate bone anchor is used in the hole for angular stability, then angular stability is achieved, but device complexity increases
Solution Approach 1:
The cable retaining insert integrates the functions of a separate bone anchor and cable guide into a single component. The insert includes a head that engages with the bone anchor to provide angular stability, and an eyelet that guides the cable, eliminating the need for separate components while achieving the same functional outcomes.
Solution Approach 2:
The cable retaining insert serves multiple functions: it provides angular stability through its head engagement with the bone anchor, guides the cable through its eyelet, and can be inserted into the hole without requiring a separate bone anchor. This multi-functional design reduces device complexity while maintaining stability.
2Adaptability or versatility
If a cable retaining insert is added to provide angular stability and guide cables, then stability and versatility are improved, but device complexity increases
Solution Approach 1:
The cable retaining insert is designed to perform multiple functions: providing angular stability, guiding cables, and working with or without bone anchors. This multi-functionality increases versatility without requiring multiple separate components, as the single insert handles various fixation scenarios.
Solution Approach 2:
The insert is divided into functional segments: a head portion for engaging bone anchors and providing angular stability, and an eyelet portion for guiding cables. This segmentation allows each part to perform its specific function efficiently while being integrated into a single component that enhances versatility.
3Ease of operation
If the bone plate profile is minimized, then ease of operation is improved, but the ability to accommodate additional fixation components is reduced
Solution Approach 1:
The cable retaining insert is designed to be inserted into the hole of the bone plate, with only its eyelet protruding from the plate surface. This nesting arrangement maintains a low bone plate profile for ease of operation while still accommodating the insert's multiple functions for angular stability and cable guidance.
Solution Approach 2:
The insert utilizes the depth dimension of the bone plate hole to house its functional components (head for anchor engagement, body for structural support), allowing only the essential eyelet to protrude from the plate surface. This dimensional arrangement maintains a low profile while preserving adaptability.
Data Source
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AI summary
A cable retaining insert configured to be used with a plate member of a bone plate assembly is provided, the cable retaining insert (5, 5') including a top side (5a) and an opposite bottom side (5b), a first portion (51) adjacent to the bottom side (5b) comprising an engagement structure (51a) configured to engage a corresponding engagement structure in the plate member (1), a second portion (53) adjacent to the top side (5a) comprising at least one cable retaining aperture (54) configured to retain a cable (200) to the plate member (1), wherein the first portion (51) of the cable retaining insert (5, 5') has a recess (52, 52') at the bottom side (5b) for accommodating at least a portion of a head (42) of a bone anchor (4). Furthermore, a bone plate assembly including a plate member (1) and such a cable retaining insert (5) is provided.