Biopsy Device Double Cannula Tissue Trauma Reduction
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Solution Overview
Problem
Current biopsy devices are bulky, painful, and often fail to collect complete core samples, causing unnecessary trauma to surrounding tissues due to their inability to efficiently cut and retrieve tissue samples.
Innovation Solution
A biopsy device comprising a double cannula system with a biased cutting edge mechanism, where an inner cannula is partially disposed within an outer cannula, allowing for axial movement to open and close the cutting edge, facilitating the collection of a total core biopsy sample with reduced tissue trauma and improved sample size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If current biopsy devices are used, then biopsy samples can be collected, but the devices are bulky and cause unnecessary trauma to surrounding tissues
Solution Approach 1:
The biopsy device is divided into two separate cannulas: an outer cannula with a closed cutting edge and an inner cannula with an open cutting edge. This segmentation allows each component to perform a specific function - the outer cannula provides structural support and containment while the inner cannula performs the cutting action, reducing overall device bulk and minimizing tissue trauma compared to single-structure devices
Solution Approach 2:
The inner cannula is partially disposed within the lumen of the outer cannula, creating a nested configuration. This nesting arrangement reduces the overall footprint of the device, making it less bulky while maintaining the functionality of both cutting edges. The nested structure allows the device to access biopsy sites more easily without requiring excessive external space
2Quantity of substance
If current biopsy devices are used, then biopsy samples can be collected, but complete core samples are not always obtained
Solution Approach 1:
The outer cutting edge is pre-configured in a closed position before insertion, and the inner cutting edge is pre-configured in an open position. This preliminary configuration ensures that when the device is inserted and positioned, the cutting edges are already in the correct states to enable complete sample collection. The closed outer edge prevents tissue leakage while the open inner edge allows for complete core extraction
Solution Approach 2:
The cutting edges are designed to be dynamic rather than static - the outer cutting edge can close and open, while the inner cutting edge can remain open or close based on operational needs. This dynamic capability allows the device to adapt during the biopsy procedure, ensuring complete sample collection while maintaining ease of operation through controlled edge movements
3Object-affected harmful factors
If current biopsy devices are used, then biopsy samples can be collected, but the procedure is painful
Solution Approach 1:
The inner cannula with its open cutting edge is extracted or advanced independently within the outer cannula to perform the cutting action. This extraction of the cutting function into a separate, controllable component allows for more precise and less painful tissue removal, reducing pain while maintaining sampling productivity through controlled inner cannula movement
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 collection of complete core biopsy samples with reduced trauma to surrounding tissues, allowing for one-handed operation and improved sample quality, addressing the limitations of existing biopsy devices.
Implementation Method 1
the cutting edge of the outer cannula is biased to close the lumen of the outer cannula and configured to open the lumen of the outer cannula when a force is applied to an inside surface of the cutting edge of the outer cannula by the inner cannula
Data Source
AI summary
Total core biopsy devices and methods of use are provided for taking a total core biopsy sample and a means for using the devices that provide for an adequate sample size and quality while being light-weight, easy to use, small, inexpensive, and permitting one-handed operation and beveled edges to reduce trauma to the surrounding tissue and organs from which a total core biopsy sample may be taken.