Cooled RF Desiccation Device with Scraping Head
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Solution Overview
Problem
Existing electrosurgical devices face challenges in controlling temperature and preventing eschar accumulation during tissue desiccation and coagulation, leading to ineffective hemostasis and procedural delays.
Innovation Solution
The development of electrosurgical devices with cooled RF desiccation and coagulation devices that include a handle, shaft, and a scraping head with a loop configuration, where the scraping head is in fluid communication with a fluid source, allowing for the circulation of cooling fluid to maintain temperature control and prevent eschar accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high current density is applied at the electrode tip for effective tissue desiccation and coagulation, then hemostasis control is improved, but eschar accumulates and sticks to the electrode causing loss of hemostatic control
Solution Approach 1:
The patent extracts the harmful eschar from the electrode surface by introducing a fluid flow through the lumen that washes away accumulated eschar, preventing it from sticking to the electrode and maintaining reliable hemostatic control throughout the procedure
Solution Approach 2:
The patent introduces a fluid intermediary substance that flows through the lumen to mediate between the electrode and the tissue, preventing direct contact between the electrode surface and accumulated eschar, thereby maintaining hemostatic control without eschar adhesion
2Productivity
If electrode temperature is increased to maximize coagulation effect, then tissue desiccation efficiency is improved, but tissue sticks to the electrode and procedural delays occur
Solution Approach 1:
The patent establishes continuous fluid flow through the lumen during the desiccation process, continuously removing tissue debris and preventing sticking, which maintains uninterrupted productive action without procedural delays
Solution Approach 2:
The patent uses flowing fluid as an intermediary between the hot electrode and the tissue, allowing high temperature operation for efficient desiccation while preventing tissue adhesion through the protective fluid barrier
3Temperature
If cooled RF desiccation device with fluid circulation is implemented, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent makes the shaft serve multiple functions: it provides structural support, defines a lumen for fluid circulation, and transmits RF energy to the electrode, thereby achieving temperature control without proportionally increasing device complexity
Solution Approach 2:
The patent nests the fluid circulation system within the existing shaft structure, placing the lumen inside the shaft rather than adding external cooling components, which minimizes the increase in device complexity while achieving effective temperature control
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 cooled devices effectively desiccate and coagulate tissues without eschar accumulation, maintaining control of hemostasis and improving surgical efficiency by preventing tissue sticking and overheating.
Implementation Method 1
a fluid is circulatable through the lumen of the shaft and the head
Implementation Method 2
When an RF voltage is provided between the desiccation and/or coagulation electrode and the return electrode, RF current flows between the desiccation and/or coagulation electrode through the body and to the return electrode. Typically, the current density is very high near the tip of the desiccation and/or coagulation electrode, which heats the adjacent tissue.
Data Source
AI summary
A desiccation device for operation on a target tissue includes a handle, a shaft extending distally from the handle, and a head. The shaft defines a lumen therethrough, and the head has a loop configuration supported on a distal end of the shaft. The head is hollow and defines a lumen therethrough. The lumen of the head is in fluid communication with the lumen of the shaft. At least a portion of the head is electrically connected to a source of electrosurgical energy. A fluid is circulatable through the lumens of the shaft and the head.