Cooled Tip RF Electrode with Sharp Blade for Tissue Coagulation
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Solution Overview
Problem
Current electrosurgical devices for liver transection struggle to simultaneously address cutting and coagulation effectively, leading to increased blood loss and prolonged transection times due to limitations in saline-linked radio frequency technology and other methods, such as scalding, insufficient coagulation, and the need for multiple instruments.
Innovation Solution
A monopolar electrosurgical instrument combining a cooled tip radio frequency electrode and a sharp blade, allowing for precise coagulation and cutting of tissue with the same instrument, using unmodulated radio frequency current and a cooling solution to maintain tissue thermo-coagulation and division, reducing blood loss and transection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If saline-linked radio frequency technology is used for tissue coagulation, then blood loss is reduced, but transection time increases and cutting precision deteriorates
Solution Approach 1:
The patent combines coagulation and cutting functions into a single electrosurgical instrument with an integrated electrode and sharp blade. The electrode delivers radio frequency energy for coagulation while the blade provides mechanical cutting, allowing both functions to be performed simultaneously by one instrument rather than requiring separate devices, thereby reducing transection time while maintaining hemostasis
Solution Approach 2:
The instrument performs preliminary coagulation of tissue before cutting occurs. The radio frequency electrode coagulates the tissue ahead of the advancing blade, pre-sealing blood vessels and ducts before they are transected. This preliminary coagulation action prevents blood loss during the subsequent cutting phase without requiring prolonged operative time
2Loss of substance
If saline-linked radio frequency technology is used for tissue coagulation, then blood loss is reduced, but cutting precision deteriorates due to scalding and tissue obscuration
Solution Approach 1:
The instrument separates the coagulation and cutting functions into distinct components: the radio frequency electrode handles coagulation while the sharp blade handles cutting. This segmentation allows each component to perform its specialized function optimally without interference, preventing the scalding and tissue obscuration problems that occur when a single saline-linked electrode attempts both functions
Solution Approach 2:
The patent replaces the saline-dependent electrothermal cutting mechanism with a mechanical sharp blade for cutting. The blade provides precise mechanical division of tissue without relying on saline delivery, eliminating the scalding effect and smoke generation that obscure the surgical field and compromise cutting precision
3Reliability
If multiple instruments are used for coagulation and cutting, then hemostasis and division can be addressed, but device complexity and operative time increase
Solution Approach 1:
The patent merges multiple instruments (separate coagulation device and cutting instrument) into a single integrated electrosurgical instrument. The device incorporates both the radio frequency electrode for hemostasis and the sharp blade for tissue division, allowing the surgeon to perform both coagulation and cutting with one instrument, thereby reducing device complexity and the number of instrument changes required during surgery
4Reliability
If saline release rate is increased for better coagulation, then coagulation effectiveness improves, but tissue scalding increases and visibility deteriorates
Solution Approach 1:
The patent replaces the saline-dependent thermal coagulation mechanism with a mechanical sharp blade for tissue division. Since the cutting function is performed mechanically rather than thermally, there is no need for high-rate saline delivery, thereby eliminating the tissue scalding and smoke generation that occur with excessive saline release while maintaining effective hemostasis through the radio frequency electrode
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 achieves significant reductions in blood loss and transection time, with a thirty percent increase in speed and fifty percent reduction in time compared to saline-linked technology, while ensuring precise cutting and coagulation without the need for additional instruments, and can be used in various surgical procedures including laparoscopic and image-guided therapies.
Implementation Method 1
high frequency electrical energy is delivered through a conductive element to the surgical site
Implementation Method 2
a cooled tip radio frequency electrode... using unmodulated radio frequency current and a cooling solution to maintain tissue thermo-coagulation
Data Source
AI summary
A monopolar electrosurgical instrument includes a hollow cylindrical metallic electrode which is connected to one pole of a radio frequency generator via a first end of the electrode, and a handle connected to and partially covering the electrode. The electrode includes at least one lumen to permit liquid supply of cooling liquid to the hollow electrode, a part covered with an insulative material, and a coagulating and cutting uninsulated tip. The tip includes a round ending part, a part attached to the cutting metal blade near the round ending part, and a part non-attached to the cutting metal blade. It is useful for precisely cutting the tissue that it is previously coagulated, using a single instrument, and avoiding risk of bleeding.