Cellular Tissue Dissection via Incision-Guided Liquid Ejection
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Solution Overview
Problem
Current cellular tissue dissection methods using water jet surgical knives face challenges in controlling the depth and direction of dissection, often requiring high-pressure pulses that can cause unintended tissue damage.
Innovation Solution
A method involving forming an incision in the cellular tissue and ejecting a liquid to expand it, using a liquid ejection device with a nozzle and edge portion to control the dissection depth and direction, allowing for low-pressure dissection and preventing deep tissue damage, and optionally using pulse flow to enhance dissection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-pressure pulse flow is ejected to dissect cellular tissue with strong cell connections, then the cellular tissue can be separated, but the water pressure reaches deep parts of the tissue causing uncontrolled dissection depth and potential damage to nerves and blood vessels
Solution Approach 1:
An incision is formed at the target site before liquid ejection. This preliminary action creates a controlled entry point that guides the liquid flow along the intended dissection path, preventing the liquid from penetrating too deeply into the tissue and causing uncontrolled damage to underlying structures such as nerves and blood vessels.
Solution Approach 2:
The incision acts as an intermediary structure that mediates between the liquid jet and the cellular tissue. By providing a pre-formed channel, the incision controls the path and depth of liquid penetration, allowing effective dissection while maintaining precision and preventing damage to deep tissue structures.
2Productivity
If high-pressure pulse flow is used to separate cellular tissue, then the tissue can be dissected, but the dissection may extend to a greater depth than planned
Solution Approach 1:
The incision is formed beforehand to establish the exact dissection path and depth limits. This preliminary structure ensures that subsequent liquid ejection follows a predetermined trajectory, maintaining both efficiency in tissue separation and precision in controlling the maximum depth of dissection.
Solution Approach 2:
The liquid pressure is concentrated locally at the incision site rather than being distributed throughout the tissue. This localized application of force along the pre-formed incision path enables efficient dissection while preventing excessive pressure from reaching deep tissue layers, thus maintaining depth precision.
3Stress or pressure
If liquid is ejected to expand the incision and dissect cellular tissue, then dissection can be achieved with lower water pressure, but the incision must be formed first requiring an additional step
Solution Approach 1:
The incision formation step, while adding a process step, enables the use of lower water pressure during dissection. This preliminary action creates a controlled pathway that reduces the force needed for subsequent tissue separation, making the overall process safer and more precise despite the additional initial step.
Solution Approach 2:
The dissection process is segmented into two distinct phases: incision formation followed by liquid-assisted expansion. This segmentation allows each phase to be optimized independently - the incision provides structural guidance while the liquid ejection phase operates at lower pressures, improving safety and precision.
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
Enables precise control over the depth and direction of cellular tissue dissection with lower water pressure, reducing the risk of deep tissue damage and improving operational ease by allowing dissection along the incision formed.
Implementation Method 1
the liquid is ejected to the incision, expanding the incision, and dissecting the cellular tissue. When the liquid is ejected to the incision, stress concentrates at the end of the incision. Therefore, even when the water pressure is low, the cellular tissue can be dissected easily.
Implementation Method 2
the liquid is ejected in the form of a pulse flow. With the pulse flow, the pressure fluctuation applied to the cellular tissue can be made greater, compared with a continuous flow. As the pressure fluctuation increases, fatigue fracture can occur more easily in the part connecting cells together.
Data Source
AI summary
An incision is formed at a site where a cellular tissue is to be dissected. A liquid is ejected to the incision. The incision is expanded. The cellular tissue is dissected. The liquid is ejected in the form of a pulse flow. The liquid is ejected in such a way as to advance obliquely to a tangential direction to a surface of the cellular tissue. A site where the liquid is applied to the surface is moved in a direction in which an angle formed by the surface and the direction of advancement of the liquid is greater.