Double-joint Sickle Knife for Endoscopic Submucosal Dissection
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Solution Overview
Problem
Endoscopic submucosal dissection (ESD) procedures face challenges such as high risk of perforation and require skilled surgeons due to the vertical angle of existing knives, leading to deep cuts and difficulty in precise tissue manipulation.
Innovation Solution
A double-joint sickle knife with a transverse and longitudinal joint mechanism, where the knife head is connected to a handle via a sliding rod, allowing for parallel cutting and independent movement, and featuring a ceramic-backed metallic edge for safe tissue cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rod-shaped knife body is used, then the structure is simple, but the cutting angle is fixed at a larger angle (approximately vertical) causing deep cuts and perforation risk
Solution Approach 1:
The knife is divided into multiple segments: a rotatable knife head portion, a knife body, and a handle, connected by a transverse joint. This segmentation allows the knife head to rotate independently and adjust the cutting angle, transforming the fixed-angle rod-shaped structure into a multi-segmented articulated structure that can adapt to different cutting requirements while reducing perforation risk.
Solution Approach 2:
The transverse joint mechanism enables the knife head to rotate dynamically during the cutting process. The joint allows angular adjustment between the knife head and knife body, transforming the static rod-shaped structure into a dynamic articulated structure that can adapt the cutting angle in real-time, thereby reducing the risk of deep cuts and perforation.
2Ease of manufacture
If the knife body is rod-shaped, then manufacturing is simple, but passive cutting requires moving the entire endoscope which is difficult to control
Solution Approach 1:
The knife is segmented into a rotatable knife head portion, knife body, and handle connected by a transverse joint. This segmentation allows the knife head to rotate independently of the endoscope, enabling active cutting control without moving the entire endoscope, thereby improving ease of operation while maintaining manufacturing simplicity.
Solution Approach 2:
The transverse joint provides dynamic rotational capability to the knife head, allowing the surgeon to control the cutting direction and angle independently. This dynamic adjustment mechanism enables precise cutting control without requiring movement of the entire endoscope, significantly improving operational ease.
3Adaptability or versatility
If existing HOOK knives are used, then ESD therapy can be performed, but the vertical cutting angle makes surgical operation difficult and increases skill requirements
Solution Approach 1:
The transverse joint mechanism enables dynamic angular adjustment of the knife head relative to the knife body, allowing the cutting angle to be optimized for different surgical scenarios. This dynamic adaptability maintains ESD therapy capability while significantly reducing operational difficulty and skill requirements.
Solution Approach 2:
The transverse joint allows changing the cutting angle parameter during surgery. By adjusting the rotation angle of the knife head, the cutting direction can be optimized for different tissue types and surgical requirements, making the procedure easier to perform while maintaining therapeutic effectiveness.
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 double-joint design reduces the risk of perforation, enhances surgical ease and efficiency by allowing parallel cutting, minimizing peripheral tissue damage, and facilitating more precise control, thus improving the safety and effectiveness of ESD procedures.
Implementation Method 1
a side of the knife head root near the knife back is connected with the knife base by the compression spring
Implementation Method 2
A torsion spring wraps around the knife base shaft and is put into the base shaft groove; two forwardly and backwardly protruding branches of the torsion spring are inserted into the knife base and the knife body respectively
Data Source
AI summary
A double-joint sickle knife for an endoscopy therapy includes a knife head, a knife base, a knife body, an outer sheath, a guide wire, a handle and a sliding rod. The knife head is connected with one end of the knife base by a transverse joint, and the other end of the knife base is connected with a head end of the knife body by a longitudinal joint. The outer sheath is sleeved on the outside of the knife body and capable of sliding along the knife body. The tail end of the knife body is connected with one end of the handle, and a sliding rod for adjusting the transverse joint is arranged on the handle. The guide wire is electric conductive. One end of the guide wire is connected with the knife head, and passes through the knife base, the knife body, the handle and the sliding rod successively. The other end of the guide wire is connected with the power port.