Biopsy Needle Snare Coil Tissue Capture Mechanism
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Solution Overview
Problem
Conventional biopsy devices are overly invasive and traumatic, and their designs limit the effectiveness and simplicity of tissue sampling, making it difficult to efficiently and reliably capture tissue specimens.
Innovation Solution
A biopsy needle with a snare coil mechanism that includes an outer cannula, an inner tube, and a movable base, where axial movement of the base and inner tube is coupled with a spring-loaded mechanism to drive the cannula into tissue and rotate the inner tube relative to the outer cannula for tissue capture, allowing for improved tissue sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional biopsy devices are used, then the procedure is simpler in design, but the tissue sampling effectiveness and reliability are limited
Solution Approach 1:
The biopsy device is divided into distinct functional segments: an outer cannula for initial tissue penetration, an inner tube for sample containment, and a snare coil mechanism for tissue capture. This segmentation allows each component to perform its specific function optimally, improving overall sampling reliability while maintaining manageable complexity through modular design.
Solution Approach 2:
The device employs a nested structure where the inner tube is received within the outer cannula, and the snare coil is attached between these two tubes. This nesting arrangement allows compact storage of the device components while enabling sequential deployment during the biopsy procedure, enhancing both reliability and ease of operation.
2Reliability
If conventional biopsy devices are used, then the device structure is simpler, but the ability to capture tissue specimens is less reliable
Solution Approach 1:
The device incorporates dynamic elements including a movable base that can translate axially within the handle housing, and an inner tube that can rotate relative to the outer cannula. These dynamic capabilities enable the snare coil to actively engage and capture tissue specimens, significantly improving capture reliability compared to static conventional devices.
Solution Approach 2:
The biasing mechanisms are configured to automatically advance the movable base and inner tube into the distal position, and to rotate the inner tube, without requiring manual manipulation. This self-service capability ensures reliable tissue capture while simplifying the operator's task, effectively balancing device complexity with operational ease.
3Object-affected harmful factors
If standard direct exploration is used, then the procedure is straightforward, but it is overly invasive and traumatic
Solution Approach 1:
The device extracts only the necessary tissue sample through a minimally invasive needle puncture, rather than requiring open surgical exploration. The outer cannula and inner tube system allows precise tissue extraction with minimal disruption to surrounding structures, significantly reducing invasiveness and trauma while maintaining procedural effectiveness.
Solution Approach 2:
The device utilizes thin-walled outer cannula and inner tube structures that can flex and navigate through tissue with minimal resistance. This flexibility allows the device to perform minimally invasive tissue sampling without requiring large incisions or extensive tissue disruption, reducing patient trauma while maintaining ease of operation.
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 more precise and efficient tissue sampling by allowing the biopsy needle to engage and capture larger tissue samples with reduced invasiveness, improving the biopsy procedure's reliability and simplicity.
Implementation Method 1
a first biasing mechanism coupled to the movable base for driving the movable base in a distal direction when the first biasing mechanism releases its stored energy
Implementation Method 2
a second biasing mechanism is coupled to the inner driven structure for driving the inner driven structure in a distal direction when the second biasing mechanism releases its stored energy
Data Source
AI summary
A biopsy needle for collecting a tissue specimen includes an outer cannula that is at least partially received within a handle housing and an inner tube received within the outer cannula and configured to receive a stylet. A snare coil is attached between the inner tube and the outer cannula and a movable base is disposed within the handle housing. The outer cannula is fixedly coupled to the base and the movable base is axially movable within the handle housing. An inner driven structure that is coupled to the inner tube is configured to travel axially across an upper surface of the movable base. The coupling between the inner driven structure and the inner tube is such that the axial driving of the inner driven structure imparts rotation to the inner tube relative to the outer cannula.