Surgical Biopsy Cannula with Nested Vacuum and Tissue Filter
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Solution Overview
Problem
Current biopsy devices face issues such as multiple tubes leading to waste and increased expense, improper placement of filters in tissue collection chambers, mode operation challenges, and the need to switch between modes outside the MRI suite, which can cause trauma and inefficiency during procedures.
Innovation Solution
A surgical device with a cutting element, biopsy line, and vacuum line, featuring a selectively openable tissue filter and remote valve system that allows for efficient tissue collection and mode switching without leaving the patient's side, reducing waste and improving operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple tubes are used in biopsy devices, then tissue collection capability is improved, but waste and expense increase
Solution Approach 1:
The biopsy device employs a single multi-functional tube that can perform multiple functions: serving as the outer cannula for tissue insertion, housing the inner cutting cannula, and acting as the collection chamber for tissue cores. This eliminates the need for separate tubes for each function, thereby reducing waste while maintaining full tissue collection capability.
Solution Approach 2:
The device utilizes a nested tube configuration where the inner cutting cannula is positioned within the outer cannula, and the collection chamber is integrated within the outer cannula structure. This nesting arrangement allows multiple functional elements to occupy the same spatial envelope, eliminating the need for multiple separate tubes and reducing material waste.
2Ease of manufacture
If filter placement is not secured, then device assembly is simplified, but tissue retention reliability decreases
Solution Approach 1:
The filter is pre-secured to the inner cannula during the manufacturing process, ensuring proper placement before the device reaches the patient. This preliminary action eliminates the risk of improper filter placement during procedure assembly while maintaining ease of device preparation, as the filter is already in its correct position and requires no additional securing steps.
3Adaptability or versatility
If mode switching requires leaving the MRI suite, then device functionality is improved, but procedural efficiency and patient safety decrease
Solution Approach 1:
A remote valve system is introduced as an intermediary control mechanism that allows mode switching without requiring the operator to leave the MRI suite. The remote valve acts as a mediator between the operator and the device modes, enabling functionality changes through a controlled interface that maintains both adaptability and procedural efficiency.
4Measurement precision
If multiple insertions are required, then sampling accuracy is improved, but patient trauma and procedure time increase
Solution Approach 1:
The device enables continuous tissue sampling through a single insertion by maintaining the inner cutting cannula in a retracted position within the outer cannula, allowing multiple tissue cores to be collected sequentially without withdrawing the outer cannula. This continuous action achieves sampling accuracy equivalent to multiple insertions while minimizing patient trauma.
Solution Approach 2:
The inner cutting cannula is pre-positioned within the outer cannula in a retracted state before insertion. This preliminary positioning allows the device to be inserted once and then perform multiple cutting actions by advancing and retracting the inner cannula, eliminating the need for multiple patient insertions while maintaining sampling accuracy.
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 minimizes waste by reusing non-bodily fluid-contacting lines, ensures proper tissue retention with a secure filter system, and allows for seamless mode switching during procedures, enhancing patient safety and procedural efficiency.
Implementation Method 1
A vacuum is used to draw the tissue into the opening in the outer cannula
Data Source
AI summary
A surgical device is disclosed that comprises a cutting element, a biopsy line, a motor line, and a vacuum line. The cutting element includes an outer cannula and an inner cannula. The biopsy line is operatively connected to a control console for moving the inner cannula within the outer cannula to cut tissue cores. The motor line is operatively connected to the control console for operating the surgical device. The vacuum line is operatively connected to the inner cannula. A selectively openable tissue filter is operatively connected to the inner cannula, and is also connected to the vacuum line.