Forceps Jaw Closure Dynamics for Biopsy Tissue Grip
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Solution Overview
Problem
Traditional forceps have a low grasping force that declines throughout the closure cycle, making it difficult to maintain a grip on tissue during medical procedures like biopsies, which can result in inadequate tissue samples.
Innovation Solution
The design features a housing with two pivotably connected jaws, a driver connected to link members, and a camming action that increases the closing force near the end of the closure cycle, ensuring a strong and consistent grip on tissue.
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 closure cycle
Solution Approach 1:
The forceps employs a dynamic closure mechanism where the driver moves longitudinally to rotate the jaws from open to closed configuration, and the connection members pivot to transform this motion into jaw closure. This dynamic system allows the grasping force to be maintained or increased during the closure cycle rather than continuously declining, resolving the contradiction between force maintenance and mechanism complexity.
Solution Approach 2:
The forceps changes the mechanical parameters during the closure cycle by using the driver's longitudinal movement to progressively rotate the jaws closed. The connection members pivot to convert linear driver movement into rotational jaw motion, creating a variable force profile that maintains or increases grasping force throughout the cycle rather than following a simple declining pattern.
2Reliability
If traditional forceps with simple closure are used, then the ease of operation is high, but the reliability of maintaining tissue grip is low
Solution Approach 1:
The forceps creates a mechanical feedback system where the driver's longitudinal movement automatically rotates the jaws closed through the pivoting connection members. This self-regulating mechanism ensures that as the driver moves, the jaws progressively close and maintain grip on tissue, providing reliable tissue grip maintenance without requiring complex manual control or additional actuation steps.
Solution Approach 2:
The closure mechanism serves itself by using the driver's longitudinal movement to automatically rotate the jaws closed through the connection members' pivoting action. The system self-regulates the jaw closure process, maintaining tissue grip reliability without requiring external intervention or complex control systems, thus balancing reliability with operational simplicity.
3Quantity of substance
If traditional forceps are used for biopsy, then the device simplicity is maintained, but the adequacy of tissue sample obtained is insufficient
Solution Approach 1:
The dynamic jaw rotation mechanism driven by longitudinal driver movement enables the jaws to maintain or increase grasping force during the closure cycle. This ensures adequate tissue is securely grasped and held throughout the biopsy procedure, obtaining sufficient tissue sample quantity without requiring overly complex additional mechanisms beyond the driver-connecting member-jaw system.
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 enhances the grasping force and maintains it throughout the closure cycle, reducing the risk of tissue release and ensuring adequate tissue samples are obtained during biopsies.
Implementation Method 1
longitudinal movement of the driver in a first direction rotates the first and second jaws relative to the housing from the open configuration towards the closed configuration
Implementation Method 2
longitudinal movement of the driver in a first direction also moves the first and second jaws longitudinally along the longitudinal axis of the housing from the open configuration towards the closed configuration
Data Source
AI summary
A method of engaging tissue is provided. The method includes: providing a forceps including a housing, a first jaw and a second jaw slidably and pivotably connected to a distal portion of the housing, and a driver; advancing the forceps in a closed configuration through a body lumen until the forceps are near a target tissue site; moving the driver in a distal direction relative to the housing to move the first and second jaws to an open configuration; positioning the first and second jaws adjacent to the target tissue site; and securing a tissue sample within the first and second jaws by moving the driver in a proximal direction relative to the housing to rotate the first and second jaws relative to the housing from the open configuration towards the closed configuration, which also moves the first and second jaws longitudinally in a proximal direction.