Segmented Electrosurgical Loop for En Bloc Lesion Resection
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Solution Overview
Problem
Current high-frequency surgical resection loops face challenges in efficiently removing large gastrointestinal lesions due to excessive incision delay, thermal damage risk, and lack of visual control during the cutting process, limiting their ability to remove lesions en bloc safely and effectively.
Innovation Solution
The design of an HF surgical resection snare with metallic wire snare parts, where only a short section is without electrical insulation, and marked for visual control, allowing for shorter incision delay and improved thermal resistance, along with an anti-slip coating for secure tissue engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the effective loop length is increased to remove larger lesions, then the ability to remove larger lesions is improved, but the incision delay increases excessively
Solution Approach 1:
The resection loop is divided into two distinct parts: a first part with complete electrical insulation and a second part without electrical insulation. This segmentation allows the loop to accommodate longer effective lengths for larger lesions while the insulated first part maintains controlled electrical characteristics to prevent excessive incision delay.
Solution Approach 2:
Different sections of the resection loop are assigned different electrical insulation properties. The first part has complete electrical insulation to control current flow and minimize incision delay, while the second part lacks insulation to provide the necessary cutting surface area for handling larger lesions, thus optimizing both parameters locally.
2Speed
If the HF current is increased to reduce incision delay, then the cutting speed is improved, but the risk of thermal damage to the organ wall increases
Solution Approach 1:
The loop is segmented into insulated and non-insulated portions, allowing the HF current to be concentrated in the insulated first part during the incision phase, enabling faster cutting speeds while limiting thermal spread to the organ wall through the insulation barrier.
Solution Approach 2:
The electrical insulation acts as an intermediary between the HF current source and the tissue, allowing controlled current flow through the insulated first part for rapid cutting while preventing direct thermal contact with the organ wall, thus reducing thermal damage risk.
3Productivity
If the resection loop is made longer to remove larger lesions en bloc, then the completeness of lesion removal is improved, but the catheter flexibility and control become worse
Solution Approach 1:
The resection loop is divided into two parts with different properties: the first part with electrical insulation and the second part without. This segmentation allows the loop to achieve the necessary length for en bloc removal of larger lesions while maintaining manageable flexibility and control characteristics through the differentiated structural design.
4Reliability
If the insulating coating is applied to the entire loop, then the electrical conductivity is reduced, but the cutting effectiveness is compromised
Solution Approach 1:
The loop is segmented into two parts with different insulation states: the first part has complete electrical insulation for stable electrical characteristics and controlled current flow, while the second part lacks insulation to maintain cutting effectiveness and electrical conductivity where needed for tissue interaction.
Solution Approach 2:
Electrical insulation is applied locally only to the first part of the loop, providing stable electrical characteristics and controlled current flow for safe operation, while the second part remains non-insulated to ensure effective electrical cutting capability, thus optimizing both insulation stability and cutting effectiveness in their respective locations.
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
This configuration enables faster, safer en bloc resection of large lesions with reduced thermal damage and enhanced visual control during the cutting process, ensuring precise and efficient removal.
Implementation Method 1
an HF surgical metal resection loop on one - the distal - end of the manipulation wire
Implementation Method 2
the electrical arc required for HF surgical cutting of tissue between the polypectomy loop and the tissue
Implementation Method 3
the wire is provided with electrical insulation in a proximal area and is without electrical insulation in a distal area
Implementation Method 4
an anti-slip coating for secure tissue engagement
Data Source
Figure 1~2
AI summary
A resection loop (1) with two loop parts has a first loop part (2) that is completely enclosed by electrical insulation and a second loop part (3) that is only enclosed by electrical insulation in a proximal area and is exposed in a distal area.