Gripping Mechanism Wire Pulling Force Transmission
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Solution Overview
Problem
Existing gripping mechanisms face inefficiencies in transmitting pushing forces due to wire buckling or curvature, particularly in treatment tools with flexible shafts, leading to reduced opening and closing efficiency of jaws.
Innovation Solution
A gripping mechanism with a frame, two jaws, and a transmission pin that uses a wire connected to one jaw to provide rotational force, allowing the jaws to open and close through selective pulling of the wire, ensuring reliable force transmission and a large opening angle by rotating the jaws in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pushing force is applied to the proximal end of the wire to open or close the jaws, then the wire structure is simple, but the pushing force cannot be reliably transmitted to the distal end due to buckling or curvature
Solution Approach 1:
The patent inverts the conventional pushing force application by using a pulling force instead. The wire is pulled at the proximal end, and this pulling force is transmitted through the wire to the distal end, where it is converted into a closing force on the jaw. This inversion eliminates buckling and curvature issues that plague pushing force transmission.
Solution Approach 2:
The patent introduces a pulley as an intermediary mechanism at the distal end of the wire. The pulley converts the pulling force from the wire into a closing force on the jaw, while also allowing the wire to remain in tension throughout its length. This intermediary enables reliable force transmission without requiring direct pushing contact.
2Shape
If both jaws are rotated simultaneously (both-opening type), then a large opening angle can be obtained, but the structure becomes more complex with pulleys and gears
Solution Approach 1:
The patent extracts and eliminates the complex pulley and gear mechanisms from the both-opening type forceps. Instead, it uses a single wire running through both jaws, with the wire's tension directly controlling the opening and closing motion of both jaws simultaneously, achieving the large opening angle benefit without the mechanical complexity.
Solution Approach 2:
The single wire serves multiple functions: it controls both the opening and closing of both jaws, transmits force throughout the length of the instrument, and eliminates the need for separate mechanisms at each jaw. This multi-functionality reduces overall device complexity while maintaining the both-opening capability.
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
This design ensures reliable transmission of pulling forces to the distal end, enabling efficient opening and closing of jaws with a large opening angle, overcoming the inefficiencies of pushing force transmission and maintaining a simple structure with fewer parts.
Implementation Method 1
the wire gives a rotational force about the first rotation axis to the first jaw through tension
Implementation Method 2
a transmission pin that passes inside the slit and that transmits a force between the first jaw and the second jaw
Data Source
AI summary
Provided is a gripping mechanism including: a frame; a first jaw that is supported by the frame so as to be rotatable about a first rotation axis; a second jaw that is supported by the frame so as to be rotatable about a second rotation axis that is different from the first rotation axis and that is parallel to the first rotation axis; a slit that is formed in at least one of the jaws; a transmission pin that passes inside the slit and that transmits a force between the jaws; and a wire that is connected to the first jaw and that transmits a rotational force about the first rotation axis to the first jaw through tension. Movement of the transmission pin inside the slit through rotation of the first jaw rotates the second jaw.