Stationary Electrode Surgical Tool for Consistent Energy Delivery
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Solution Overview
Problem
Existing surgical tools that combine mechanical cutting and electrosurgical functions face issues with inconsistent energy delivery due to a rotating blade tip acting as the active electrode, leading to inconsistent performance and requiring additional housing that increases the device size, necessitating larger entry ports in patients.
Innovation Solution
A surgical tool arrangement with a stationary active electrode on a minimal-sized housing that integrates mechanical cutting and electrosurgical functions, using a static housing with a small surface area electrode and an elongated cannula for consistent energy delivery, eliminating the need for a separate power cable and reducing the device's overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotating blade tip is used as the active electrode for electrosurgical functions, then both mechanical cutting and electrosurgical functions are integrated in one tool, but the surface area of the active electrode varies during rotation, causing inconsistent energy delivery and performance
Solution Approach 1:
The tool is divided into separate functional components: a stationary housing containing the active electrode for electrosurgical functions, and a separate rotating cutting element. This segmentation allows the active electrode to remain stationary with consistent surface area while the cutting element performs mechanical cutting, resolving the contradiction between functional integration and energy delivery consistency.
Solution Approach 2:
Instead of making the rotating cutting element the active electrode (as in conventional designs), the invention inverts the approach by placing the active electrode on the stationary housing. This inversion allows the electrosurgical function to be delivered through a stable, non-rotating structure, ensuring consistent energy delivery while maintaining both cutting and electrosurgical capabilities.
2Adaptability or versatility
If an adapter unit with additional housing is added to convert a mechanical cutting device to bipolar electrosurgical device, then electrosurgical functionality is achieved, but the overall device size increases significantly, requiring larger entry ports
Solution Approach 1:
The electrosurgical housing is merged with the mechanical cutting device housing to form a single integrated structure. The active electrode is positioned on the outer surface of the housing, allowing electrosurgical functionality to be achieved without adding separate adapter units or increasing overall device volume, thus enabling bipolar electrosurgical capability while maintaining compact size.
Solution Approach 2:
The housing structure is designed to serve multiple functions: it houses the mechanical cutting element, provides the active electrode for electrosurgical functions, and maintains a compact form factor. This multi-functionality eliminates the need for additional adapter units, achieving both mechanical cutting and bipolar electrosurgical capability in a single device of minimal size.
3Volume of moving object
If a stationary active electrode with small surface area is used on minimal-sized housing, then device size is minimized and entry port requirements are reduced, but achieving both mechanical cutting and electrosurgical functions in one tool becomes more difficult
Solution Approach 1:
The rotating cutting element is nested within the stationary housing that contains the active electrode. This nesting arrangement allows both mechanical cutting and electrosurgical functions to be integrated in a compact configuration, with the cutting element operating inside the housing structure, thereby minimizing overall device size while maintaining full functionality.
Solution Approach 2:
The active electrode is positioned on the outer surface of the housing, utilizing the external surface area rather than requiring internal space. This dimensional arrangement allows the electrosurgical function to be achieved without increasing the internal volume of the device, enabling integration of both cutting and electrosurgical functions in a minimal-sized housing.
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 solution provides consistent energy delivery and performance, reducing the need for additional housing and minimizing the size of the surgical entry port, enhancing surgical precision and efficiency.
Implementation Method 1
electrical energy is provided to an electrode arrangement provided on the cannula, so as to heat the electrode immediately adjacent the window at the cutting interface
Implementation Method 2
a motor disposed within the handpiece, and a hub drivingly engaged with an output shaft associated with the motor
Data Source
AI summary
A surgical tool arrangement including a powered handpiece which cooperates with a combined electrosurgical and mechanical cutting instrument. The electrosurgical and mechanical cutting instrument includes an outer static housing element which defines an electrode for delivering electrical energy to the surgical site, and a cutting element disposed within the outer housing and movable relative thereto for manipulating patient tissue. The electrosurgical and mechanical cutting instrument is an integral component attachable to the surgical tool to provide multiple functions in a single instrument, such as cauterization, ablation and mechanical cutting, without the need for attachment of additional housing structures or other adapters. The tool arrangement also includes a universal handpiece which is capable of accepting and operating a number of different surgical instruments, each having one or multiple functions.