Bipolar Electrosurgical Device External Irrigation for Hemostasis
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Solution Overview
Problem
Current surgical devices for cutting and sealing tissue, particularly in sinus surgery, lack an effective mechanism for reducing bleeding during procedures due to the complexity and precision required, with existing methods either failing to provide adequate hemostasis or limiting fluid delivery during energy application.
Innovation Solution
A bipolar electrosurgical device with a unique irrigation channel configuration that delivers fluid externally to the cutting window, allowing for effective bipolar energization and hemostasis while preventing immediate aspiration, thereby enhancing tissue sealing and reducing bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fluid is delivered between the inner and outer shafts in conventional electrocautery debriders, then fluid delivery is provided during cutting, but the fluid is immediately aspirated and cannot effectively interact with the electrode surfaces for bipolar energization
Solution Approach 1:
The patent extracts the fluid delivery function from the internal channel between inner and outer shafts and relocates it to an external irrigation channel. The outlet port is positioned radially outside the outer shaft and proximal to the cutting window, allowing fluid to be delivered externally rather than internally. This extraction resolves the contradiction by enabling fluid to reach the electrode surfaces without being immediately aspirated through the internal channel.
Solution Approach 2:
The patent introduces an intermediary irrigation channel that serves as a mediator between the fluid source and the electrode surfaces. This external channel allows fluid to be delivered to a position where it can effectively interact with the electrodes without being immediately removed by aspiration. The intermediary structure enables the fluid to perform its hemostatic function before being aspirated.
2Productivity
If mechanical cutting devices are used in sinus surgery, then tissue cutting and removal is effective, but there is no mechanism for sealing tissue to reduce bleeding
Solution Approach 1:
The patent merges mechanical cutting functionality with bipolar electrocautery sealing capability into a single integrated device. The cutting implement (formed by the cutting tip and cutting window) and the electrode surfaces are combined in one device, allowing both cutting and hemostasis to be performed during the same surgical procedure. This merging resolves the contradiction by enabling tissue removal while simultaneously controlling bleeding through bipolar energization.
Solution Approach 2:
The device achieves multi-functionality by incorporating both mechanical cutting and bipolar electrocautery sealing capabilities. The single device can perform tissue cutting through the cutting implement and tissue sealing through the electrode surfaces with fluid delivery. This universality allows the device to address both productivity (cutting efficiency) and harmful factors (bleeding control) without requiring separate instruments.
3Object-affected harmful factors
If RF energy and saline are coupled for Transcollation technology, then controlled thermal energy is delivered without charring, but the device complexity increases
Solution Approach 1:
The patent utilizes hydraulics by delivering saline through the external irrigation channel to the electrode surfaces. The fluid delivery system employs hydraulic principles to transport and position the saline where it is needed for bipolar energization. This approach enables controlled thermal energy delivery without charring while using established hydraulic systems rather than more complex alternative mechanisms.
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 controlled thermal energy delivery and effective hemostasis, reducing blood loss and improving surgical precision by ensuring optimal fluid interaction with the electrodes, even in complex procedures like sinus surgery.
Implementation Method 1
The technology uses a combination of radiofrequency (RF) energy and saline to provide hemostatic sealing of soft tissue and bone
Implementation Method 2
Coupling of saline and RF energy allows a device temperature to stay in a range which produces a tissue effect without the associated charring found in other ablation methods
Implementation Method 3
The irrigation channel extends parallel to the outer shaft, and terminates in at least one outlet port. The outlet port is proximally spaced from the cutting window and is located radially outside of the outer shaft. With this construction, fluid (e.g., saline) is emitted at the exterior surface of the device near the cutting window and is readily present for interacting with the electrode surfaces
Implementation Method 4
The inner shaft defines a distal portion forming a cutting tip. The cutting tip and the cutting window combine to define a cutting implement
Data Source
AI summary
A bipolar electrosurgical device including an outer shaft, an inner shaft, first and second electrode surfaces, and an irrigation channel. The outer shaft defines a lumen, a proximal end and a distal end forming a cutting window. The inner shaft is rotatably disposed within the outer shaft, and defines a distal portion forming a cutting tip. The cutting tip and the cutting window combine to define a cutting implement. The first and second electrode surfaces are electrically isolated, and are formed at the cutting implement. The irrigation channel extends parallel to the outer shaft, and terminates in at least one outlet port. The outlet port is proximally spaced from the cutting window and is located radially outside of the outer shaft. Fluid (e.g., saline) is emitted at the exterior surface of the device near the cutting window and is readily present for interacting with the electrode surfaces.