Intramedullary Nail Aiming Guide Assembly
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Solution Overview
Problem
Traditional intramedullary nail implantation systems face challenges such as implant failure, difficulty in alignment of fixation screws, and issues like cutout, cephalad cutout, proximal fragment rotation, and nonunion, which affect the stability and healing of bone fractures.
Innovation Solution
The development of intramedullary nails with proximal and distal locking mechanisms, including interlocking fixation devices and headless fasteners, along with advanced insertion tools featuring guide wires and ratchet systems to ensure proper alignment and stabilization during implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional intramedullary nails are used for fixation, then the implantation procedure is simple, but the risk of implant failure and difficulty in alignment of fixation screws increases
Solution Approach 1:
The patent introduces a guide sheath as an intermediary tool that facilitates the alignment and insertion of fixation screws through the intramedullary nail. The guide sheath includes alignment features that ensure proper positioning of the fixation screw relative to the nail, thereby improving alignment accuracy without complicating the overall implantation procedure
Solution Approach 2:
The intramedullary nail is pre-configured with openings and alignment features during manufacturing. The guide sheath is also pre-designed with specific geometric features that align with the nail's openings. This preliminary configuration ensures that when the components are assembled during surgery, proper alignment is achieved without requiring complex adjustment procedures
2Reliability
If traditional fixation methods are used, then the procedure is straightforward, but the risk of cutout and cephalad cutout increases
Solution Approach 1:
The patent employs headless fasteners with specific geometric configurations that distribute loading more evenly across the bone-implant interface. The fasteners feature enlarged heads or specialized threading patterns in critical regions to prevent cutout and cephalad cutout by improving local stress distribution and anchorage strength
3Reliability
If traditional intramedullary nails are used, then the implantation is simpler, but proximal fragment rotation and nonunion occur more frequently
Solution Approach 1:
The guide sheath serves as a mediator that ensures precise alignment of the fixation screw with the intramedullary nail's openings. It includes alignment features such as guide wires or geometric constraints that prevent rotational misalignment during screw insertion, thereby preventing proximal fragment rotation and promoting proper fracture healing
Solution Approach 2:
The intramedullary nail is pre-configured with specifically oriented openings and alignment features that guide the fixation screw placement. This preliminary configuration ensures that when the fixation screw is inserted through the guide sheath, it achieves the correct orientation and position to prevent fragment rotation without requiring complex intraoperative adjustment
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
Intramedullary nails, aiming guide assemblies, and methods. The aiming guide assembly can include an aiming guide having a collet and a connection bolt configured to engage a connection bolt driver. The connection bolt may be self-retaining and engage with the connection bolt driver in a manner to prevent unintentional disengagement.