Electrosurgical Electrode Spacer Layout for Precise Tissue Dissection
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Solution Overview
Problem
Existing electrosurgical devices face challenges in accessing tight and deep areas like the hip joint during arthroscopic procedures, leading to difficulties in precise tissue removal and high dependence on surgeon technique, with potential for excessive tissue loss.
Innovation Solution
An electrosurgical device with a steerable or bendable shaft and a unique electrode configuration, featuring an insulative spacer that angles the active electrode to minimize energy flow through tissue, allowing precise dissection and debulking while reducing unintended tissue alteration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the active electrode is positioned at the distal end of the device, then tissue treatment capability is improved, but the risk of unintended tissue alteration increases due to energy flow through deep tissue
Solution Approach 1:
The insulative spacer acts as an intermediary element positioned between the active and return electrodes. It directs the electric field to flow laterally along the spacer's surface rather than through the tissue depth, enabling distal tissue treatment while preventing unintended deep tissue alteration through field shaping
Solution Approach 2:
The insulative spacer changes the electrical field distribution parameter by providing a high-impedance path that redirects current flow. This parameter modification ensures energy is confined to the intended treatment zone at the distal end without penetrating deeper into non-target tissue
2Device complexity
If the device uses a straight shaft configuration, then structural simplicity is improved, but access to tight and deep areas like the hip joint deteriorates
Solution Approach 1:
The shaft is designed with dynamic flexibility, allowing it to bend and articulate to reach tight and deep areas such as the hip joint. This dynamic configuration maintains structural simplicity while enabling access to difficult-to-reach anatomical locations during arthroscopic procedures
3Ease of manufacture
If the active electrode planar surface is oriented perpendicular to the longitudinal axis, then manufacturing simplicity is improved, but surgical precision deteriorates due to high dependence on surgeon technique
Solution Approach 1:
The active electrode planar surface is oriented at an asymmetric angle (e.g., 45 degrees) relative to the longitudinal axis rather than perpendicular. This asymmetric orientation, combined with the insulative spacer geometry, creates a self-aligning configuration that improves surgical precision by reducing dependence on surgeon technique while remaining manufacturable
4Volume of moving object
If the insulative spacer is positioned close to the active electrode, then device compactness is improved, but tissue shielding capability deteriorates
Solution Approach 1:
The insulative spacer extends in the lateral dimension rather than only axially, creating a shield that blocks electric field penetration sideways. This dimensional approach maintains device compactness while effectively shielding non-target tissue from energy exposure
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 enables more targeted and localized tissue separation, minimizing tissue loss and improving surgical precision in tight spaces by stabilizing the electrode orientation and shielding non-target tissue from energy, thus reducing reliance on surgeon skill.
Implementation Method 1
an insulative spacer axially separating the return and active electrode... The insulative spacer is tapered between the return electrode and active electrode... configured to direct a lateral flow of energy away from the target tissue
Implementation Method 2
electrosurgical device for applying high frequency voltage to treat tissue
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Disclosed herein is an electrosurgical device including a handle at a proximal end and an elongate shaft coupled to the handle and extending distally from the handle. The device also includes a distal working end, including a return electrode and an active electrode supported by an insulative spacer, the insulative spacer separating the return and active electrode. The active electrode has a planar surface that is distal facing and defines a maximum planar surface length. The insulative spacer is generally tapered between the return electrode and active electrode. The insulative spacer has a planar stabilizing surface on a device first side that has a length that extends along the longitudinal axis, extending from a distal-most end of the return electrode to a leading edge surface of the active electrode. This length is at least as long as the maximum planar surface length.