Locking Forceps With Dynamic Jaw Motion for Tissue Retention
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Solution Overview
Problem
Traditional forceps exhibit low grasping force that diminishes during the closure cycle, making it difficult to maintain a grip on tissue, especially during biopsies, leading to the risk of inadequate tissue samples.
Innovation Solution
A forceps design with a housing, first and second jaws, connection members, and a driver that allows for simultaneous rotational and longitudinal movement, incorporating a connecting pin assembly and camming action to maintain a high closing force throughout the closure cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional forceps are used with simple jaw closure mechanism, then the device complexity is low, but the grasping force continuously declines during the closure cycle
Solution Approach 1:
The forceps employs a dynamic closure mechanism where the jaws undergo both rotation and translation during closure. The connection members allow the jaws to pivot while simultaneously moving along the longitudinal axis, creating a camming action that maintains high grasping force throughout the closure cycle rather than allowing force to continuously decline as in traditional static mechanisms.
Solution Approach 2:
The closure mechanism is divided into separate functional components: connection members that pivotably connect jaws to the housing, a driver that moves longitudinally, and a camming surface that converts the driver's linear motion into rotational and translational jaw movement. This segmentation allows each component to perform its specific function while collectively maintaining high grasping force.
2Reliability
If traditional forceps with simple closure are used, then ease of operation is maintained, but the tissue may be accidentally released during biopsy
Solution Approach 1:
The camming mechanism provides mechanical feedback that maintains the jaws in a securely closed position throughout the biopsy procedure. As the driver moves longitudinally, it continuously engages the camming surface, which in turn continuously applies force to keep the jaws closed on the tissue sample, providing constant feedback that prevents accidental release.
Solution Approach 2:
The forceps mechanism is designed so that the camming action begins to engage before the jaws reach full closure, preliminarily preparing the high-force gripping state. This preliminary engagement ensures that as soon as the tissue is grasped, the mechanism is already in a configuration that maintains strong holding force, preventing accidental release during the biopsy procedure.
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 design ensures a consistent and increased closing force, effectively grasping and retaining tissue samples, reducing the risk of accidental release and enhancing biopsy sample quality.
Implementation Method 1
incorporating a connecting pin assembly and camming action to maintain a high closing force throughout the closure cycle
Data Source
AI summary
A forceps may include: a housing defining an internal passageway and a longitudinal axis extending between proximal and distal ends of the housing; a first jaw and a second jaw each slidably and pivotably connected to the housing, where the first and second jaws have an open configuration and a closed configuration; a first connection member having a first end pivotably connected to the first jaw; a second connection member having a first end pivotably connected to the second jaw; a connecting pin assembly that slidably and pivotably connects the first and second jaws to the housing; and a driver operably connected to a second end of the first connection member and a second end of the second connection member. Longitudinal movement of the driver in a proximal direction relative to the housing moves the first and second jaws, along with the connecting pin assembly, relative to the housing.