Rotating Biopsy Sampling Portion with Controlled Speed
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Solution Overview
Problem
Current biopsy devices for soft tissue sampling face challenges in efficiently and effectively obtaining tissue samples with minimal damage to surrounding tissues, particularly in terms of controlling the ratio between rotation speed and axial advancement velocity, and in maintaining sample integrity during extraction.
Innovation Solution
A biopsy device with a rotating sampling portion that adjusts its speed between 100 RPM to 10,000 RPM and axial advancement velocity between 0.4 mm/sec to 50 mm/sec, featuring a cutting edge with internal protrusions and threading, and a stylet mechanism for sample extraction, allowing for precise tissue engagement and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotation speed is increased to improve sampling efficiency, then productivity increases, but friction and heat generation increase causing tissue damage
Solution Approach 1:
The patent applies parameter changes by optimizing the rotation speed to a specific range (100-10,000 RPM) and controlling axial advancement velocity (0.4-50 mm/sec) to balance sampling efficiency with tissue damage minimization. This quantitative parameter optimization resolves the contradiction between productivity and harmful effects.
Solution Approach 2:
The patent employs periodic action through intermittent rotation and axial advancement cycles, allowing the sampling portion to engage and disengage from tissue periodically. This reduces continuous friction and heat generation while maintaining effective sampling over time.
2Productivity
If axial advancement velocity is increased to reduce procedure time, then productivity increases, but cutting precision and sample integrity deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing an optimal axial advancement velocity range (0.4-50 mm/sec) that coordinates with rotation speed to achieve both efficient procedure completion and precise cutting with maintained sample integrity.
3Productivity
If rotation speed is increased to improve sampling efficiency, then productivity increases, but heat generation increases causing cellular toxicity
Solution Approach 1:
The patent applies parameter changes by limiting rotation speed to a controlled range (100-10,000 RPM) that prevents excessive heat generation while maintaining adequate sampling efficiency, directly addressing the temperature-control aspect of the contradiction.
Solution Approach 2:
The patent employs periodic action through intermittent rotation cycles that allow heat dissipation between engagement phases, reducing cumulative heat generation and associated cellular toxicity while maintaining overall sampling productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device enables efficient sampling with reduced tissue damage and improved sample quality by optimizing the ratio of rotation speed to axial advancement, ensuring effective cutting and separation of tissue samples while minimizing friction and heat generation.
Implementation Method 1
a driving unit configured to rotate said sampling portion with a speed in a range of 100 rounds-per-minute (RPM) to 10,000 RPM while said sampling portion axially advances into said soft tissue
Implementation Method 2
said sampling portion is shaped and sized for engaging said soft tissue with friction forces
Data Source
AI summary
A soft tissue biopsy device including, an elongated handle including a gripping member, an elongated flexible shaft mechanically comprising a hollow distal sampling portion with an internal lumen and a distal opening facing a soft tissue, a driving unit configured to rotate the sampling portion with a speed in a range of 100 rounds-per-minute (RPM) to 10,000 RPM while the sampling portion axially advances into said soft tissue.