Introducer Cannula Tissue Anchor Prevents Migration
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Solution Overview
Problem
Introducer cannulas used to maintain access pathways for biopsies and tissue markers often experience migration, requiring repositioning and potentially leading to incorrect biopsy locations or marker deployments.
Innovation Solution
An introducer cannula equipped with a retractable and deployable elongate tissue anchor, actuated by a mechanism at the proximal end, to securely anchor within the tissue, preventing migration and ensuring accurate positioning of medical instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an introducer cannula is used to maintain an access pathway to the tissue lesion, then the pathway is maintained for obtaining tissue samples and introducing tissue markers, but the introducer cannula may undergo migration requiring repositioning and potentially leading to incorrect biopsy or marker deployment locations
Solution Approach 1:
The tissue anchor is deployed into the tissue ahead of time to secure the introducer cannula in the correct position before the biopsy or marker deployment procedures begin, preventing migration during subsequent operations
Solution Approach 2:
The tissue anchor acts as an intermediary element between the introducer cannula and the tissue, providing a secure attachment point that prevents direct migration of the cannula while allowing easy deployment and removal
2Measurement precision
If the introducer cannula is made secure to prevent migration, then positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The introducer cannula is segmented into functional components including the cannula body, the tissue anchor, and the actuation mechanism, allowing each component to perform its specific function independently while simplifying the overall design
Solution Approach 2:
The tissue anchor is nested within the introducer cannula in a compact configuration during insertion, then deployed outward to engage the tissue, providing secure anchoring without increasing the insertion profile or overall device complexity
Data Source
AI summary
An introducer cannula configured for receiving a medical instrument includes a cannula tube having a side wall surrounding a central lumen, a proximal end, and a distal end. An elongate tissue anchor is positioned in the central lumen of the cannula tube. The elongate tissue anchor has a mounting end and an anchoring free end. The elongate tissue anchor is movable in the central lumen such that the anchoring free end is movable between a retracted position and a deployed position. An actuator is coupled to the proximal end of the cannula tube. The actuator is coupled to the mounting end of the elongate tissue anchor. The actuator is operatively configured to selectively position the anchoring free end of the elongate tissue anchor in one of the retracted position and the deployed position.