Nested Cannula Biopsy Device for Single-Insertion Tissue Sampling
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Solution Overview
Problem
Current biopsy devices face challenges such as incomplete tissue severing, prolonged procedures, trauma to the patient, and increased risk of infection due to the need for multiple insertions and the handling of bio-hazardous materials, while also being cumbersome and not easily compatible with multiple imaging modalities.
Innovation Solution
A surgical device with a rotatable cutting element comprising an outer and inner cannula, a spool, and a spring mechanism that allows for a single insertion to remove multiple tissue samples efficiently, minimizing trauma and exposure to bio-hazards, and is designed for compatibility with various imaging modalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insertions are performed to obtain sufficient tissue samples, then complete tissue removal is achieved, but patient trauma increases and infection risk rises
Solution Approach 1:
The device segments the tissue sampling function into multiple cutting elements (outer cannula with inner cutter and inner cannula with outer cutter) that can sequentially remove tissue samples during a single insertion, eliminating the need for multiple punctures while ensuring complete tissue removal
Solution Approach 2:
The device employs a nested structure where the inner cannula is disposed within the outer cannula, allowing both cutting elements to operate simultaneously from a single insertion site, thereby achieving multiple tissue samples without additional patient trauma
2Reliability
If traditional core biopsy devices are used, then tissue samples can be obtained, but the procedure time is prolonged due to multiple insertions
Solution Approach 1:
The device enables continuous tissue sampling action during a single insertion by coordinating the movement of inner and outer cannulas to sequentially cut and remove multiple tissue samples without withdrawing the device, thereby significantly reducing procedural time
Solution Approach 2:
The cutting elements are pre-positioned and ready to operate immediately upon insertion, with the inner cutter and outer cutter already configured to engage tissue, eliminating setup time between multiple insertions
3Object-affected harmful factors
If disposable devices are used, then bio-hazard exposure is minimized, but device complexity and cost increase
Solution Approach 1:
The nested configuration of inner and outer cannulas within a single disposable device maximizes functional complexity while maintaining a compact form factor that is manageable and cost-effective for single-use disposal
Solution Approach 2:
Multiple cutting elements and tissue sampling functions are merged into a single integrated disposable device, eliminating the need for separate instruments and reducing overall system complexity despite the enhanced capabilities
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 reliable and complete tissue removal with reduced procedural time, minimized exposure to bio-hazards, and ease of use, while providing satisfactory access for biopsy and compatibility with multiple imaging techniques.
Implementation Method 1
a spring positioned between said spool and said piston; wherein said spring is configured for translating said spool in a distal direction to place said outer cannula in a fired position relative to the housing
Implementation Method 2
wherein said spring is configured for translating said piston in a proximal direction relative to the housing that places the sampling aperture in an open configuration
Data Source
Figure 1~1B
Figure 1A~2
Figure 3
AI summary
A surgical device is disclosed. The surgical device comprises a housing, a cutting element, a spool, a piston, and a spring. The cutting element extends from the housing at the distal end of the housing. The cutting element comprises an outer cannula and an inner cannula. The spool is engaged with the outer cannula. The piston is engaged with the inner cannula. A spring is positioned between the spool and the piston. The spool is translated distally to translate the outer cannula towards the distal end. And the piston translates the inner cannula towards the distal end to sever tissue.