Ablation Device with Nonconductive Tip for Simultaneous Tissue Resection and Coagulation
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Solution Overview
Problem
Current electrosurgical devices lack the ability to simultaneously resect tissue and achieve hemostasis effectively, often resulting in extensive bleeding and fluid accumulation during medical procedures due to inadequate selective operation between resection and coagulation modes.
Innovation Solution
An ablation device with a nonconductive distal tip featuring a coagulation electrode array and a cutting wire, controlled by a device controller, allowing for simultaneous resection and coagulation of tissue through selective electrical current supply, utilizing a specific geometry to manage current density and a conductive fluid for efficient energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrosurgical resection is performed to remove tissue, then tissue removal efficiency is improved, but extensive bleeding and fluid accumulation occur
Solution Approach 1:
The patent combines resection and coagulation functions into a single electrosurgical device with a unified electrode structure. The electrode array is configured to perform both cutting (resection) and coagulation simultaneously or sequentially, eliminating the need for separate devices and enabling integrated control of tissue removal and hemostasis.
Solution Approach 2:
The device employs dynamic control of electrical current parameters to switch between resection mode (higher current for cutting) and coagulation mode (lower current for sealing). The system can adaptively adjust current density and duration based on real-time tissue response, allowing the same electrode to perform different functions as needed.
2Productivity
If high intensity heating is applied to resect tissue, then tissue cutting capability is improved, but tissue charring occurs
Solution Approach 1:
The electrode array is designed with varying current distribution across different regions. The geometry and material properties of the electrode elements are optimized to concentrate current density at the tip for effective cutting while distributing heat more broadly at deeper levels to prevent charring. This localized quality variation allows simultaneous cutting and charring prevention.
Solution Approach 2:
The system employs pulsed or intermittent application of electrical current rather than continuous heating. By applying energy in controlled pulses, the tissue has time to dissipate heat between pulses, preventing thermal accumulation that leads to charring while maintaining sufficient peak temperature for effective cutting during each pulse.
3Ease of operation
If electrosurgical modalities are used for resection, then ease of operation is improved, but selective operation between resection and coagulation modes is insufficient
Solution Approach 1:
The electrosurgical device is designed as a universal platform where a single electrode array can perform multiple functions: resection (cutting), coagulation (sealing), and potentially other tissue manipulation techniques. The system includes integrated controls that allow the operator to select different operational modes, making the device adaptable to various surgical needs while maintaining ease of use through unified interface design.
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
Enables efficient removal of unhealthy tissue while preventing fluid accumulation and achieving hemostasis by allowing for precise control over resection and coagulation modes, reducing the risk of tissue charring and improving surgical efficiency.
Implementation Method 1
one or more of the wires may receive energy in the form of electrical current from a source (e.g., RF generator) and emit RF energy in response, resulting in coagulation of tissue in contact therewith
Implementation Method 2
The cutting wire is configured to receive energy in the form of electrical current from the source (e.g., RF generator) and emit RF energy in response, thereby resulting in the resection of a tissue
Data Source
AI summary
The invention generally relates to a tissue ablation system including an ablation device to be delivered to a target site and achieve both resection and coagulation of tissue. The ablation device can be used during an electrosurgical resection procedure to both resect tissue and further selectively coagulate surrounding tissue in the resection site so as to prevent or stop fluid accumulation (e.g., blood from vessel(s)) as a result of the resection of tissue.