Bolt with Counter-Torque Opening for External Fixator Wire
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Solution Overview
Problem
Current external fixator systems require multiple tools and assistance to securely fix wires to the frame, leading to complexity and potential misalignment issues during the tightening process.
Innovation Solution
A bolt with a threaded section, head section, and clamping elements, combined with a counter torque tool that engages with a complementary opening, allows for single-person wire tensioning and fixation without misalignment, using a single wrench for nut tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple tools (wire tensioner and two wrenches) are used to fix the wire, then the wire can be securely fastened, but the procedure becomes complicated and requires at least two persons
Solution Approach 1:
The patent combines the functions of the wire tensioner and counter-torque tool into a single integrated tool. The counter-torque opening is built into the bolt head, allowing the wire tensioner to simultaneously provide tensioning force and counter-torque, eliminating the need for separate tools and reducing the requirement from two persons to one
Solution Approach 2:
The bolt is designed with multiple functions: it provides structural connection, wire clamping through clamping elements, and counter-torque capability through the integrated counter-torque opening. This multi-functional design allows a single tool to perform what previously required multiple specialized tools
2Reliability
If multiple tools are used to tighten the bolt and nut, then the wire can be fixed, but the surgeon needs additional assistance and limited space becomes problematic
Solution Approach 1:
By merging the counter-torque function into the bolt itself through an integrated opening, the design eliminates the need for a second person to provide counter-torque assistance. The surgeon can now perform the entire wire fixation procedure alone, improving ease of operation in limited surgical spaces
3Reliability
If bolts and nuts are re-tightened, then the connection is strengthened, but the wire loses alignment due to rotation of the bolt opening
Solution Approach 1:
The bolt is designed with pre-formed counter-torque openings that prevent rotation during tightening. The complementary fit between the bolt section and counter-torque opening creates a mechanical constraint that counteracts rotational forces, ensuring the wire maintains its alignment even when the connection is re-tightened
Data Source
AI summary
A system for fixing a wire to a surface of an external fixator having a wire adapted to extend through bony structure fastened with respect to the surface. A bolt having a shaft which comprises a threaded section, a head section and at least one clamping element is provided wherein the bolt is adapted to extend through an opening in the external fixation element with a nut, and clamps the wire to the surface. A counter torque tool is used to provide a counter torque while fastening the wire with the bolt and the nut. The bolt comprises a counter torque opening and wherein the counter torque tool comprises a section which is adapted to engage into the counter torque opening of the bolt to apply the counter torque.