Cannulated Bone Implant With Threaded and Finned Segments
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Solution Overview
Problem
Current surgical treatments for hammertoe deformity, such as those using Kirschner wires and implants, face challenges in securely fixing the implant to prevent migration and rotation, and in promoting effective bone healing and integration, especially in cases of poor bone quality.
Innovation Solution
A cannulated bone implant with a threaded proximal portion, a finned distal portion, and a central passage is designed to securely fix into the proximal phalanx, featuring a transition portion with a bend and a tapered finned distal portion to prevent migration and promote micro-motion and bone healing, made from materials like metal, polymers, or allograft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Kirschner wire and implant are used to treat hammertoe, then the hammertoe deformity can be corrected, but the implant may migrate or rotate and bone healing may be compromised
Solution Approach 1:
The implant is divided into distinct functional segments: a threaded proximal portion for secure bone anchoring, a finned distal portion for preventing migration and rotation, and a central passage for wire insertion. This segmentation allows each portion to perform its specific function optimally, addressing the fixation reliability issue while maintaining positioning precision through the coordinated action of these segments.
Solution Approach 2:
Different portions of the implant have different surface characteristics tailored to their specific functions: the proximal portion has threads for secure anchoring in bone, while the distal portion has fins for preventing migration and rotation. This local differentiation of surface properties ensures reliable fixation and precise positioning without requiring the entire implant to have uniform characteristics.
2Stability of the object's composition
If the implant is made rigid to prevent migration, then positioning stability is improved, but bone integration and micro-motion healing are compromised
Solution Approach 1:
The implant exhibits different mechanical properties at different locations: the proximal threaded portion provides rigid anchoring for stability, while the distal finned portion allows controlled micro-motion for bone integration. This local differentiation of mechanical properties enables the implant to simultaneously achieve positioning stability and promote bone healing through appropriate micro-motion.
Solution Approach 2:
The finned distal portion is designed to control and guide micro-motion between the implant and surrounding bone, transforming the potential harmful effect of movement into a beneficial healing mechanism. The fins provide a interface that allows controlled micro-motion while preventing complete migration, thus achieving both stability and bone integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The implant effectively secures the bone implant in place, reduces the risk of migration and rotation, and enhances bone integration by allowing micro-motion and promoting healing, even in patients with poor bone quality.
Implementation Method 1
The threaded portion may be positioned along the proximal portion between the proximal end and the transition portion. The threaded portion may be configured to secure the implant into a bone of a patient.
Implementation Method 2
The finned portion may be positioned along the distal portion between the transition portion and the distal end. The finned portion may be configured to prevent migration and/or rotation of the implant in use.
Data Source
AI summary
Various cannulated bone implants and methods of using the cannulated bone implant are disclosed. The cannulated bone implant can include a proximal portion, a proximal end, a distal portion, a distal end, a transition portion, a threaded portion, a finned portion and a central passage. The transition portion can comprise a bend positioned between the proximal portion and the distal portion. The threaded portion can be positioned along the proximal portion between the proximal end and the transition portion. The threaded portion can be configured to secure the implant into a bone of a patient. The finned portion can be positioned along the distal portion between the transition portion and the distal end. The finned portion can be configured to prevent migration and/or rotation of the implant in use. The central passage can extend linearly from the proximal end of the implant to the distal end of the implant.