Guide Wire Seal Assembly for Leak-Resistant RIA Drive Shafts
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Solution Overview
Problem
Current Reamer Irrigator Aspirator (RIA) systems face issues with irrigation fluid leakage and seal disengagement during the reaming of medullary canals, leading to inefficiencies and potential damage when using guide wires.
Innovation Solution
A drive shaft assembly with a laterally insertable seal configured to prevent fluid leakage, ensuring the seal remains engaged with the drive shaft during use, utilizing a seal area with beveled edges and a carrier for secure attachment, allowing irrigation and aspiration while maintaining the seal's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is used to prevent irrigation fluid leakage, then fluid containment is improved, but the seal may disengage during use
Solution Approach 1:
The seal assembly is segmented into a seal member and a carrier, allowing the seal to be securely attached to the drive shaft through the carrier while maintaining the ability to prevent fluid leakage. The segmentation enables independent optimization of sealing function and attachment stability.
Solution Approach 2:
The seal is pre-installed on the drive shaft before the reaming procedure begins. The carrier is attached to the drive shaft in advance, and the seal is positioned on the carrier before insertion into the bone, ensuring proper positioning and preventing disengagement during use.
2Measurement precision
If a guide wire is inserted through the drive shaft, then the reaming procedure can be guided accurately, but irrigation fluid may leak through the guide wire path
Solution Approach 1:
The seal acts as an intermediary element between the guide wire and the irrigation fluid path. It allows the guide wire to pass through while blocking the irrigation fluid from leaking, effectively mediating between the need for accurate guidance and fluid containment.
Solution Approach 2:
The seal is constructed as a flexible membrane or thin film that can deform to accommodate the guide wire passing through it while maintaining its barrier function to prevent irrigation fluid leakage. The flexibility allows it to conform around the wire while still providing effective sealing.
3Ease of manufacture
If the seal is laterally insertable into the drive shaft, then assembly is simplified, but the seal may become disengaged during use
Solution Approach 1:
The seal is nested within the carrier structure, which is itself attached to the drive shaft. This nested arrangement allows for simple lateral insertion during assembly while the carrier provides external support and retention features that prevent disengagement during use.
Solution Approach 2:
The seal assembly uses composite construction with the seal member made of sealing material and the carrier made of structurally strong material. This composite approach allows the seal to be easily inserted laterally while the carrier provides the mechanical strength and retention features needed to prevent disengagement.
Data Source
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AI summary
A system for reaming a medullary canal of a bone, comprises a reamer device including an elongated member and a reamer head rotatably coupled to a distal end of the elongated member and a drive shaft sized and shaped to be inserted through the elongated member so that a first connector at a distal end of the drive shaft is engagable with the reamer head, rotation of the drive shaft rotates the reamer head relative to the elongated member, the drive shaft including a channel extending longitudinally therethrough and a hole extending laterally therethrough from a first opening through a first side wall of the drive shaft to a second opening through a second side wall of the drive shaft in combination with a seal configured to be inserted through the hole of the drive shaft so that the seal extends across the channel of the drive shaft.