Surgical Cutting Device with Segmented RF and Mechanical Tips
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Solution Overview
Problem
Current electrosurgical methods for cutting nerve and soft tissue in minimally invasive procedures face challenges such as inefficient cutting, high collateral thermal damage, difficulty in fine dissection, and inadequate control over necrosis, leading to pain and prolonged recovery times, with radio frequency energy causing smoke and obscuring visualization.
Innovation Solution
A cutting device with a probe and sleeve configuration, where the probe has a radio frequency cutting tip and a blunt tip for tissue capture, allowing for precise cutting and suction of tissue, and a sleeve with a distal cutting tip for bone cutting, enabling efficient and controlled tissue removal with minimal collateral damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio frequency energy is used to cut tissue, then cutting efficiency is improved, but collateral thermal damage increases
Solution Approach 1:
The device divides the cutting function into two separate components: a sharp mechanical cutting tip for precise tissue separation and a radio frequency electrode for coagulation. This segmentation allows the mechanical tip to perform clean cuts without excessive thermal damage, while the RF electrode handles hemostasis separately.
Solution Approach 2:
A fluid irrigation system acts as an intermediary between the cutting tip and surrounding tissue, providing cooling to the cut surface and washing away debris. This fluid medium reduces direct thermal exposure to adjacent tissues while maintaining cutting effectiveness.
2Productivity
If high power settings are used to initiate cut in closed environment, then cutting ability is improved, but tissue trauma increases
Solution Approach 1:
The device separates the cutting function from the coagulation function, allowing low-power RF energy to be used for hemostasis while a sharp mechanical tip performs the cutting. This eliminates the need for high-power RF settings that cause excessive tissue trauma.
Solution Approach 2:
The patent replaces the purely electrosurgical cutting mechanism with a mechanical cutting tip that physically severs tissue. This mechanical substitution allows for precise cutting with minimal thermal damage, avoiding the tissue trauma associated with high-power RF cutting.
3Productivity
If radio frequency energy is used for tissue ablation, then tissue resection is achieved, but fine dissection capability is lost
Solution Approach 1:
The device combines a sharp mechanical cutting tip for fine dissection with an RF electrode for tissue resection and coagulation. The mechanical tip enables precise dissection along tissue planes, while the RF component handles bulk tissue removal and hemostasis.
Solution Approach 2:
The device applies different cutting mechanisms at different locations: the sharp mechanical tip provides fine dissection capability for precise work, while the RF electrode handles broader tissue resection. This local differentiation of cutting quality allows both fine dissection and efficient resection.
4Speed
If radio frequency energy is used for cutting, then cutting speed is improved, but smoke generation increases
Solution Approach 1:
The patent replaces RF electrical cutting with a mechanical cutting tip that physically severs tissue. This mechanical substitution eliminates the vaporization of cellular fluids that produces smoke, while maintaining efficient cutting speed through the sharp mechanical edge.
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 facilitates precise and efficient cutting of nerve and soft tissue with reduced collateral damage, improved control over necrosis, and enhanced visualization, minimizing pain and recovery time, while allowing for simultaneous bone and soft tissue cutting in a single tool.
Implementation Method 1
Radio frequency (RF) energy is used in a wide range of surgical procedures because it provides efficient tissue resection and coagulation
Implementation Method 2
Conventional monopolar high frequency electrosurgical devices typically operate by creating a voltage difference between the active electrode and the target tissue, causing an electrical arc to form across the physical gap between the electrode and tissue
Implementation Method 3
At the point of contact of the electric arcs with tissue, rapid tissue heating occurs due to high current density between the electrode and tissue
Implementation Method 4
This high current density causes cellular fluids to rapidly vaporize into steam, thereby producing a 'cutting effect' along the pathway of localized tissue heating
Implementation Method 5
A further disadvantage of using radio frequency energy is the generation of smoke. The smoke is malodorous and can contain airborne viral particles that may be infectious
Implementation Method 6
Radio frequency energy controls bleeding by coagulating small blood vessels
Data Source
AI summary
A cutting device includes a lower jaw extending between a proximal end and a distal end. The distal end terminates with a cavity and a blunt tip. An upper jaw extends between and proximal end a distal end. The upper jaw is configured for translation along the lower jaw. The upper jaw includes a cutting tip configured to cut bone.