Biopsy Cannula Depth Stop Mechanism for Precision Tissue Sampling
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Solution Overview
Problem
Current biopsy methods, particularly open biopsies, are invasive, costly, and carry risks of infection and disfigurement, while percutaneous biopsies often yield insufficient tissue samples, making them less effective for cancer assessment.
Innovation Solution
A depth stop device is longitudinally positioned on a biopsy cannula to prevent over-insertion, featuring a guiding portion that circumferentially encompasses the cannula shaft and a locking mechanism to ensure accurate positioning, with measurement indicia for precise depth control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If percutaneous biopsy is used instead of open biopsy, then patient trauma and cost are reduced, but tissue sample adequacy deteriorates
Solution Approach 1:
The biopsy device incorporates a dynamic tissue expansion mechanism where a balloon or expandable element is inflated within the tissue mass after insertion. This expansion dynamically increases the sampling volume and tissue contact area, allowing adequate tissue acquisition through a small initial puncture wound, thus resolving the contradiction between minimal patient trauma and sufficient tissue sample adequacy
Solution Approach 2:
The invention transitions from a one-dimensional needle puncture to a three-dimensional tissue engagement by deploying an expandable element within the tissue mass. This dimensional transformation allows the biopsy device to access and sample sufficient tissue volume through a minimally invasive entry point, simultaneously achieving both reduced patient trauma and adequate tissue sampling
2Measurement precision
If depth stop device is added to biopsy cannula, then insertion depth precision is improved, but device complexity increases
Solution Approach 1:
The depth stop device is pre-configured with measurement indicia and positioning features before the biopsy procedure. The desired insertion depth is predetermined and marked on the device, allowing the operator to simply align and engage the depth stop without complex calculations or adjustments during the procedure, thus achieving precise depth control with minimal added complexity
Solution Approach 2:
The depth stop mechanism is designed to automatically engage and disengage based on the cannula's insertion depth. The measurement indicia and mechanical features work together to self-regulate the insertion depth without requiring continuous operator intervention or complex electronic controls, maintaining simplicity while ensuring precision
Data Source
AI summary
A biopsy system with a grid plate used as either a lateral or medial compression plate of a localization fixture used with a breast coil includes a rotatable guide cube that may be inserted into a desired rectangular recess in the grid plate after rotating to position a selected guide hole in the desired spatial orientation. Versions of a guide cube include those rotatable in two axes to provide additional hole positions, angled holes, enlarged circular holes that function with a rotating guide to support a noncircular biopsy instrument cannula (e.g., trocar/sleeve combination, core biopsy probe of a biopsy device) for rotation. A rotating guide may have an unlocked state for easily sliding to a selected longitudinal position thereon. Thereafter, the rotating guide is locked to serve as a positive depth stop (e.g., quarter turn locking elastomeric rings, triangular and scissor clips, and shutter depth stops).