Endoscopic Cutting Forceps Lever Latching for Simpler Jaw Locking
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Solution Overview
Problem
Current latching mechanisms for endoscopic cutting forceps and other lever-actuated devices are mechanically complex and costly to manufacture, necessitating a simpler and more affordable solution.
Innovation Solution
A novel latching mechanism utilizing a selector plate and latch plate with a loop spring and labyrinthine latch element, allowing for adjustable positioning to facilitate temporary locking of jaws during tissue cutting, while being easy and inexpensive to manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current latching mechanisms are used for endoscopic cutting forceps, then the jaws can be temporarily locked in a closed position, but the mechanism becomes mechanically complex and expensive to manufacture
Solution Approach 1:
The latching mechanism is divided into separate functional components: a lever with latch feature, a selector plate with detent feature, and a spring element. These segmented parts work together to provide the latching function while reducing overall mechanical complexity and easing manufacturing.
Solution Approach 2:
Instead of using a complex positive latching mechanism, the invention employs a negative latching approach where a spring-loaded detent on the selector plate passively engages with the lever's latch feature. The latching action occurs when the lever is released, allowing the spring to automatically engage the detent, thereby simplifying the mechanism.
2Reliability
If current latching mechanisms are used for endoscopic cutting forceps, then the jaws can be temporarily locked in a closed position, but the manufacturing cost increases
Solution Approach 1:
By segmenting the latching mechanism into simple, discrete components (lever, selector plate, spring), each part can be manufactured independently using standard machining processes, reducing overall manufacturing cost and complexity.
Solution Approach 2:
The latching mechanism uses simple, easily replaceable components that can be manufactured at low cost. The spring element and detent features are designed to be inexpensive parts that can be readily produced and replaced if needed.
3Adaptability or versatility
If the latching mechanism allows adjustable positioning of the lever, then the jaws can be locked at different positions, but the mechanism complexity increases
Solution Approach 1:
The selector plate can be moved between different positions to enable or disable the latching function. This dynamic positioning allows the lever to be locked at different positions when the selector plate is in the latching position, while maintaining simplicity through the use of a single movable component.
Solution Approach 2:
The selector plate acts as an intermediary between the user's selection and the latching mechanism. By positioning the selector plate, the user controls whether the spring-loaded detent can engage with the lever's latch feature, providing adjustable positioning capability without adding significant complexity.
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 mechanism provides a mechanically simple and cost-effective way to temporarily lock jaws in a closed position, enhancing operational efficiency and reducing manufacturing costs for endoscopic cutting forceps and other surgical instruments.
Implementation Method 1
a latch plate (210) mounted to the selector plate (205), the latch plate (210) comprising a loop spring (240)
Data Source
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AI summary
A lever latching system comprising: a housing; a lever having a latch pin fixedly mounted to the lever, the lever being movably mounted to the housing so that the latch pin moves in an arc; and a latch plate movably mounted to the housing for linear movement with respect to the housing, the latch plate comprising a labyrinth for receiving the latch pin.