Preloaded Localization Wire Implantation Apparatus
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Solution Overview
Problem
Current methods for implanting localization wires in tissue masses are often inaccurate and require multiple hands, making it difficult to precisely position the wire during procedures like biopsies, as the wire can be displaced during needle removal and imaging techniques complicate the process.
Innovation Solution
A self-contained apparatus with a retractable cannula and actuator that allows for single-handed implantation of a preloaded localization wire, where the cannula moves from an insertion to a retracted position without displacing the wire, ensuring accurate placement and allowing the other hand to hold imaging devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual threading of localization wire through needle is used, then flexibility in wire selection is maintained, but positioning accuracy deteriorates due to wire displacement during needle removal
Solution Approach 1:
The localization wire is pre-loaded into the needle assembly before the procedure, with the distal end positioned at the needle tip and the anchor within the needle lumen. This preliminary positioning eliminates the need for manual threading during the procedure and prevents wire displacement during needle removal, as the wire is already in its final position when the needle is inserted into the tissue mass
Solution Approach 2:
The localization wire is nested within the needle lumen, with the anchor portion contained inside the needle. The wire is positioned such that it extends from the needle tip while the anchor remains protected within the needle body, allowing the needle to be inserted with the wire already in place without manual manipulation during the critical positioning phase
2Measurement precision
If three hands are used for ultrasonography-guided wire implantation, then imaging guidance is maintained, but coordination difficulty increases leading to positioning errors
Solution Approach 1:
The imaging guidance system and wire implantation device are merged into a single integrated assembly. The needle assembly with pre-loaded wire functions as a unified tool that can be manipulated with one hand while maintaining ultrasonographic guidance, eliminating the need for multiple hands to coordinate separate wire feeding and needle positioning actions
3Ease of operation
If plunger displacement is used to force wire past needle tip, then wire insertion is automated, but positioning accuracy deteriorates due to force application affecting final location
Solution Approach 1:
The wire is pre-positioned at the needle tip with the anchor within the needle lumen before insertion, eliminating the need for plunger-driven force application. The wire is already in its final position when the needle is inserted, so no additional force is needed to advance it past the tip, preventing positioning errors that would result from forceful displacement
Solution Approach 2:
The plunger mechanism and force application system are removed from the design. Instead of using mechanical force to advance the wire, the wire is passively positioned by the pre-loaded configuration, allowing the needle and wire to be inserted together as a unit without active propulsion during the insertion process
Data Source
AI summary
An apparatus for implanting a localization wire, wherein the apparatus exhibits a ready configuration and a relaxed configuration, includes a handle having a slot and a cannula disposed within the handle and having an insertion tip and a projection configured to selectively enter the slot. The cannula is movable between a ready configuration and a relaxed configuration. A localization wire is disposed within the cannula. An actuator is configured to retract the cannula into the handle.