Laparoscopic Tissue Cutting Instrument with Deployable Blade and Tissue Stop
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Solution Overview
Problem
Existing medical instruments for cutting body tissue are not suitable for suprapubic access to the cervical canal via a laparoscopic trocar or trocar sleeve, particularly due to rigid distal ends and lack of a tissue stop, which hinders effective conical hollowing out of the cervix.
Innovation Solution
A medical instrument with a rotatable outer sleeve at the distal end and a laterally pivotable cutting edge, accompanied by a tissue stop that can be folded out to a predetermined distance, allowing safe insertion through a trocar sleeve and precise conical tissue removal, with the cutting edge designed as a knife or high-frequency electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid distal end with laterally protruding arm is used, then structural stability is improved, but adaptability to trocar sleeve access is worsened
Solution Approach 1:
The distal end of the instrument shaft is designed with dynamic characteristics, allowing it to be introduced through the trocar sleeve in a constrained state and then deployed to assume its functional configuration within the body cavity. This enables the instrument to adapt to the narrow trocar access while maintaining structural integrity during operation.
Solution Approach 2:
The cutting edge and tissue stop are arranged in a nested or folded configuration at the distal end, allowing them to be contained within a compact structure that can pass through the trocar sleeve. Once inside the body cavity, these elements can be deployed to their operational positions, providing both adaptability to access and structural stability during use.
2Device complexity
If no tissue stop is provided, then device complexity is reduced, but manufacturing precision of conical tissue removal is worsened
Solution Approach 1:
The tissue stop is designed to define the apex of the conical tissue removal zone, providing a mechanical reference point that ensures precise and consistent conical resection geometry. This mechanical feature enables accurate control of the cutting depth and angle without requiring complex control systems.
3Productivity
If cutting edge is always exposed, then cutting efficiency is improved, but safety during insertion is worsened
Solution Approach 1:
The cutting edge is designed to be deployable or extendable from a protected retracted position to an exposed operational position. During insertion through the trocar sleeve, the cutting edge remains concealed within the instrument shaft, ensuring safety. Once positioned within the body cavity, the cutting edge can be deployed to enable efficient tissue cutting.
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 safe and precise conical removal of tissue from the cervical canal during suprapubic access, with adjustable cutting edge positions and coagulation options, enhancing the efficacy of procedures like LASH conization.
Implementation Method 1
a cutting edge which is arranged adjacent to the distal end of the instrument shaft and can be folded out with respect to a longitudinal axis of the shaft and rotatable about the longitudinal axis
Implementation Method 2
an outer sleeve rotatable about the longitudinal axis is arranged at the distal end of the instrument shaft
Implementation Method 3
a tissue stop that can be folded out to a predetermined distance
Implementation Method 4
with coagulation options
Data Source
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AI summary
The invention relates to an instrument for cutting body tissue, comprising an instrument shaft, a blade, which is arranged adjacent to the distal end of the instrument shaft and can be folded out with respect to a longitudinal axis of the shaft and can be rotated about the longitudinal axis, and an operating part arranged at the proximal end of the instrument shaft. The invention is characterized in that a proximal end of the blade directed toward the operating part can be laterally pivoted out away from the longitudinal axis about an end of the blade that faces away from the proximal end and that is distally articulated to an articulation point, that a tissue stop is arranged at the distal end of the instrument shaft, and in that the tissue stop can be brought into an active position in which a stop surface facing the blade in the proximal direction has a specified fixed distance from the articulation point.