Electrosurgical Scissors with Tapered Conductive Edge
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Solution Overview
Problem
Traditional scissors used in surgery face issues such as tissue 'popping out,' incomplete cuts, uneven edges, difficulty in visualizing the cut, blade jamming, and accidental damage to nerves or vessels due to mechanical shearing action, and lack a mechanism to stop bleeding effectively.
Innovation Solution
Development of monopolar and bipolar electrosurgical scissors with a conductive tapered edge that focuses electrical energy for cutting, allowing tissue to be grasped without cutting mechanically, and incorporating a switch for selective energy activation, including a footswitch mechanism for convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional sharp scissor blades are used for mechanical shearing, then cutting action is achieved, but tissue pops out of the scissor on compression and incomplete cuts occur
Solution Approach 1:
The patent replaces the traditional mechanical shearing system with an electrosurgical system that uses electrical energy to cut tissue. The scissor blades are equipped with electrosurgical electrodes that deliver electrical current to the tissue, causing controlled cutting through thermal coagulation rather than mechanical shearing. This substitution eliminates the problems of tissue popping out and incomplete cuts associated with mechanical compression.
2Ease of operation
If sharp mechanical blades are used, then cutting is achieved, but cut edges become uneven due to dull scissors or tissue type changes
Solution Approach 1:
The electrosurgical cutting system replaces mechanical blades with electrical energy delivery through electrodes. The cutting action is controlled by electrical current parameters rather than mechanical sharpness, ensuring consistent cut edge quality regardless of blade wear or tissue type variations. The electrical energy provides uniform thermal cutting across different tissue types.
3Ease of operation
If sharp mechanical blades are used, then cutting action is achieved, but accidental nicking or damage to nerves, blood vessels, tendons, and implanted electrical leads occurs
Solution Approach 1:
The electrosurgical electrodes are designed to concentrate electrical energy in a highly localized area at the tissue interface. The cutting effect is confined to the immediate contact zone between the electrode and tissue, while surrounding structures such as nerves, blood vessels, and implanted leads are spared from damage. The localized energy delivery provides precise cutting control.
4Ease of operation
If mechanical shearing action is used, then tissue is cut, but no mechanism exists to stop bleeding once tissue has been cut
Solution Approach 1:
The electrosurgical scissor system integrates multiple functions into a single device. The same electrodes that perform cutting also provide hemostasis by coagulating blood vessels through controlled thermal energy delivery. The system can switch between cutting mode and coagulation mode, eliminating the need for separate instruments and providing comprehensive surgical capability.
5Manufacturing precision
If bipolar instruments with optimal electrode distances are used, then small activation zone is achieved, but focused electrical energy concentration is insufficient
Solution Approach 1:
The patent transitions from bipolar electrode configuration to monopolar electrosurgical technology, representing a dimensional change in the electrical energy delivery system. The monopolar system uses a single active electrode with a return path through the patient's body to ground, creating a more concentrated and powerful electrical field at the tissue interface compared to bipolar configurations. This enables superior energy concentration and cutting efficiency.
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 electrosurgical scissors provide precise cutting with reduced tissue compression, prevent accidental damage, maintain sharpness, and enable coagulation to stop bleeding, offering a clean and controlled cutting process with minimal thermal necrosis.
Implementation Method 1
transfers electrical energy from an energy source to the tapered edge of the first electrically conductive scissor blade to electrically cut interlaying tissue
Data Source
AI summary
Embodiments are directed to various monopolar and bipolar electrosurgical scissor instruments. An electrosurgical scissor instrument includes at least one scissor blade that has an electrically conductive tapered edge, where the tapered edge is insufficiently sharp to shear or otherwise mechanically cut tissue. The scissors also include another scissor blade movably mounted to the first scissor blade. The second scissor blade includes a flat contact surface that is aligned with the tapered edge of the first scissor blade. The scissors further include a scissor body that transfers electrical energy from an energy source to at least one of the scissor blades to electrically cut interlaying tissue located between the blades. In a monopolar embodiment, only one blade is conductive; whereas, in a bipolar embodiment, both blades are conductive.