Shrinkable Insulating Pouch for Polyp Resection Arcing
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Solution Overview
Problem
Electrosurgical snares used for resecting polyps often experience uncontrolled arcing during procedures, leading to ineffective cutting, potential burns to surrounding tissues, and increased operative times due to the uncontrolled dispersion of electrosurgical energy.
Innovation Solution
A wire loop snare equipped with an electrically non-conductive shrinkable pouch that encapsulates and insulates the polyp from surrounding tissue and bodily fluids, preventing arcing by collapsing voids and reducing the size of the polyp, thereby facilitating safer and more efficient removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire loop snare is used for polyp resection, then the polyp can be severed from underlying tissue, but uncontrolled arcing occurs between the polyp and surrounding structures causing harmful effects
Solution Approach 1:
An electrically non-conductive pouch is introduced as an intermediary barrier between the polyp and surrounding tissues. This pouch acts as a mediator that prevents direct electrical contact and arcing while allowing the electrosurgical snare to effectively remove the polyp. The pouch is positioned over the polyp before electrosurgical energy is applied, creating a protective interface that channels energy control.
Solution Approach 2:
The patent employs a flexible, electrically non-conductive pouch made of thin film material that can be conformally applied to the polyp surface. This flexible shell adapts to the polyp's shape and provides continuous electrical insulation throughout the resection process, preventing arcing between the polyp and adjacent structures while maintaining surgical accessibility.
2Ease of operation
If the pouch is made shrinkable to reduce polyp size, then retrieval is facilitated, but the pouch complexity increases
Solution Approach 1:
The pouch material is designed with shape memory properties that allow it to change its physical state in response to temperature or other stimuli. When exposed to specific conditions (such as heat from the electrosurgical field or body temperature), the pouch transitions from an expanded state to a shrunk state, automatically reducing the polyp size to facilitate retrieval through the insertion site without requiring complex mechanical shrinking 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 solution effectively reduces the risk of arcing and short-circuiting, enhances patient safety by preventing tissue burns, and simplifies polyp retrieval by minimizing the polyp's size and distance from surrounding tissues.
Implementation Method 1
A wire loop snare equipped with an electrically non-conductive shrinkable pouch that encapsulates and insulates the polyp from surrounding tissue and bodily fluids, preventing arcing
Implementation Method 2
The pouch is shrinkable upon activation by a surgeon. Shrinking the pouch to encapsulate and, optionally or alternatively, reduce the size of the polyp
Data Source
AI summary
An endoscopic electrosurgical instrument is presented for encapsulating and resecting biologic tissue, such as a polyp, from an anatomical structure, such as a lumen. The instrument includes an encapsulation assembly which includes a snare coupled to an electrically non-conductive, shrinkable pouch in a drawstring-like configuration. The encapsulation assembly may be folded within the elongated cylindrical housing of the endoscopic instrument, positioned within the patient at the surgical site, and deployed for use. Once positioned over the polyp, the snare is tightened around the peduncle thereof, and the pouch is activated, thereby shrinking and encapsulating the polyp. The polyp may then be resected using conventional or electrosurgical techniques. The disclosed instrument may include surgical tools and/or electrosurgical electrodes for performing surgical procedures. The disclosed system may reduce the occurrence of undesirable arcing and may aid retrieval of resected tissue.