Movable Handle Medical Device for Adjustable Grasping Force
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Solution Overview
Problem
Existing medical devices struggle to adjust grasping force for treatment targets between grasping jaws effectively, depending on the type, size, and conditions of the tissue, leading to inconsistent treatment outcomes.
Innovation Solution
A medical device with a movable handle and shaft system that allows adjustable grasping force by changing the length of the driving force transmission path, using a rotor and lever mechanism to modify the force applied to the end effector, enabling precise control of grasping force based on the type and size of the treatment target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the grasping force is increased to ensure secure holding of the treatment target, then the reliability of treatment improves, but the risk of tissue damage increases
Solution Approach 1:
The movable handle allows dynamic adjustment of the grasping force by changing the lever arm length. The operator can move the handle along the movable shaft to adjust the second length, thereby dynamically adjusting the grasping force applied to the treatment target based on tissue type and size, ensuring secure holding without excessive force that could cause damage
Solution Approach 2:
The system changes the mechanical parameter (lever arm length) to adjust the grasping force. By varying the second length from the axis of pivot to the acting position, the grasping force can be precisely controlled to match the specific requirements of different treatment targets, preventing both insufficient holding and excessive force causing tissue damage
2Adaptability or versatility
If the grasping force is adjusted for different treatment conditions, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The movable handle mechanism serves multiple functions: it acts as both the operating handle for closing the grasping jaws and the adjustment mechanism for changing grasping force. By moving the handle to different positions on the movable shaft, the same component provides both actuation and force adjustment, reducing the need for separate adjustment mechanisms and simplifying the overall device structure
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 adjustment of grasping force for optimal treatment, allowing for appropriate energy application to the target tissue, improving treatment efficacy and safety.
Implementation Method 1
A movable handle is configured to pivot with respect to the housing via an axis of pivot and having an input position where an operation is inputted so as to cause the handle to pivot. The movable shaft and the movable handle are configured such that at least one of a first length from the axis of pivot to the input position and a second length from the axis of pivot to an acting position where a driving force acts to move the movable shaft is changeable
Data Source
AI summary
A medical device comprises a housing and a sheath having opposed proximal and distal ends and being attached from the proximal end to the housing. An end effector is attached to the distal end portion of the sheath. The end effector includes a pair of grasping jaws capable of be openable and closable with respect to one another. A movable shaft includes a distal end that being connected at to the end effector and configured to be movable with respect to the sheath so as to cause the paired grasping jaws to be opened or closed with respect to one another. A movable handle is configured to pivot with respect to the housing and having an input position where an operation is inputted so as to cause the handle to pivot. The movable shaft is changeable in an initial state before the operation is inputted at the input position.