Composite Electrosurgical Tool Cover Insulation
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Solution Overview
Problem
Current electrosurgical tool covers face challenges in maintaining electrical insulation, preventing arc tracking, and ensuring durability and flexibility in minimally invasive and robotically controlled surgical procedures, where high temperatures, wet environments, and varied angular movements pose risks of electrical conduction to undesired locations and instrument damage.
Innovation Solution
A composite electrosurgical tool cover with a tip cover portion made of a flexible, electrically insulative material like silicone and a base cover portion made of a material with higher tear strength, such as polyurethane, providing a reinforced structure that inhibits electrical conduction and withstands high temperatures, while maintaining a range of motion and resistance to impact and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-material electrosurgical tool cover is used, then the manufacturing process is simple, but the cover cannot simultaneously provide high flexibility, high tear strength, and high temperature resistance
Solution Approach 1:
The cover is constructed from multiple materials with different properties: an inner layer of flexible material (e.g., silicone rubber) providing flexibility and conformability, and an outer layer of heat-resistant material (e.g., PTFE or polyimide) providing thermal protection. This composite structure enables the cover to simultaneously achieve flexibility, tear strength, and temperature resistance that cannot be obtained with a single material.
Solution Approach 2:
Different portions of the cover have different material compositions tailored to their specific functional requirements. The inner layer contacts the instrument and requires flexibility, while the outer layer faces surgical smoke and heat and requires thermal resistance. This local differentiation of material properties optimizes performance for each specific operational condition.
2Ease of operation
If a flexible material like silicone is used for the cover, then the cover can conform to the instrument and allow range of motion, but the material has low tear strength and poor durability
Solution Approach 1:
The combination of flexible inner material (silicone rubber) and stronger outer material (PTFE or polyimide) creates a composite cover that inherits the flexibility and conformability of the inner layer while gaining the tear strength and durability of the outer layer. The layered structure allows the flexible material to provide range of motion while the stronger material prevents tearing.
3Temperature
If a heat-resistant material like PTFE is used for the cover, then the cover can withstand surgical temperatures, but the material is less flexible and more prone to cracking
Solution Approach 1:
The heat-resistant outer layer (PTFE or polyimide) provides thermal protection against surgical smoke and hot gases, while the flexible inner layer (silicone rubber) maintains the cover's flexibility and resistance to cracking. The composite structure allows each material to perform its specialized function without compromising the other.
Solution Approach 2:
The heat-resistant material is applied specifically to the outer surface where thermal exposure occurs, while the flexible material forms the inner structure requiring elasticity. This localized material assignment optimizes heat resistance where needed while preserving flexibility where required.
4Ease of operation
If the cover material is made thinner to maintain flexibility, then the range of motion is preserved, but the electrical insulation and arc tracking resistance are reduced
Solution Approach 1:
The multi-layer composite structure provides sufficient electrical insulation and arc tracking resistance without requiring excessive thickness. The heat-resistant outer layer (PTFE or polyimide) has excellent dielectric properties and arc resistance, while the flexible inner layer provides conformability. Together, they achieve the required insulation performance with a thin overall profile that maintains flexibility.
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 composite cover effectively prevents electrical conduction to undesired locations, maintains instrument functionality, and enhances durability and flexibility, ensuring patient safety and instrument performance in challenging surgical environments.
Implementation Method 1
a flexible, electrically insulative material like silicone
Implementation Method 2
withstand high temperatures
Implementation Method 3
Resistance to impact and abrasion
Data Source
AI summary
A cover for an electrosurgical instrument having a wrist structure and an end effector is provided. The cover includes a hollow elongated structure, which includes a tip cover portion and a base cover portion integrally connected to the tip cover portion. The tip cover portion has a distal end with an opening therethrough sized to receive the end effector of the electrosurgical instrument and is composed of a first, electrically insulative material having a flexibility sufficient to allow the end effector to be manipulated while the end effector is received in the opening. The base cover portion is composed of a second material having a higher tear strength than the first material. The tip cover portion and the base cover portion overlap at an overlap region configured to receive the wrist structure of the electrosurgical instrument when the end effector is received in the opening.