Rotatable Jaws with Biasing Strip for Tissue Grasping
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Solution Overview
Problem
Conventional hemostatic devices and clips used for gastrointestinal bleeding and tissue closure face challenges such as insufficient strength for permanent hemostasis and difficult placement, leading to incomplete closure due to limited tissue grasping capability.
Innovation Solution
A medical device with rotatable jaws and a biasing strip that radially biases the jaws to engage tissue, featuring a drive wire mechanism for longitudinal movement and rotation, allowing for effective tissue grasping and closure, and includes a gripping strip to enhance tissue engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional clips are used for tissue grasping and closure, then the device structure is simple, but the tissue grasping capability is limited and placement is difficult
Solution Approach 1:
The device is divided into distinct functional components: a housing, rotatable jaws with teeth for tissue grasping, a biasing strip with projections, and a drive wire mechanism. This segmentation allows each component to be optimized for its specific function while working together to achieve superior tissue engagement and closure capability
Solution Approach 2:
The jaws are rotatably mounted within the housing, allowing them to pivot between open and closed positions. The biasing strip is nested within the housing structure, with its projections extending between the jaws. The drive wire runs through the housing to engage the jaws, creating a compact nested arrangement that maximizes functionality within a constrained endoscopic delivery system
2Strength
If conventional hemostatic devices are used, then the device is easy to manufacture, but the strength for permanent hemostasis is insufficient
Solution Approach 1:
The device utilizes a composite structure combining a flexible biasing strip made of elastomeric material with rigid metallic or ceramic projections formed by stamping. This combination provides both the flexibility needed for deployment through the endoscope and the structural strength required for permanent tissue anchoring and hemostasis
Solution Approach 2:
The biasing strip is pre-formed with stamped projections during manufacturing, creating a ready-to-deploy structure that automatically engages tissue upon jaw closure. This preliminary formation of the engagement projections eliminates the need for complex assembly steps and ensures consistent hemostatic performance
3Reliability
If traditional clips are used for closing perforations, then the device structure is simple, but the placement difficulty and incomplete closure increase
Solution Approach 1:
The jaws are designed to rotate dynamically between open and closed positions rather than moving linearly. This rotational motion allows the jaws to conform to the tissue geometry and achieve complete closure of perforations from multiple angles, improving reliability while the drive wire mechanism maintains ease of operation through simple longitudinal actuation
Solution Approach 2:
The biasing strip acts as an intermediary element between the jaws and the tissue, with its stamped projections extending between the jaws to provide additional tissue engagement. This intermediary structure ensures complete closure by distributing the closing force across multiple contact points, making the device more reliable while maintaining ease of placement
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 device provides a strong and effective means for achieving permanent hemostasis and tissue closure with improved tissue engagement, reducing the need for invasive surgical procedures and enhancing the reliability of endoscopic interventions.
Implementation Method 1
The biasing strip is operatively connected to at least one of the first and second jaws to bias the jaws radially. The biasing strip includes at least one projection extending radially inwardly towards the longitudinal axis, the at least one projection sized and structured to engage the tissue between the first and second jaws.
Data Source
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AI summary
Medical systems, devices and methods are provided for engaging tissue, e.g. for clipping tissue, closing a perforation or performing hemostasis. Generally, the medical system including a housing, first and second jaws rotatable relative to the housing, a driver, and an elongate drive wire. The elongate drive wire may be disconnected from the driver, first and second jaws, and the housing, which are left in vivo engaged with the tissue. The medical device of the system may include a biasing strip engaged with the jaws, and/or a gripping strip attached to at least one of the jaws to improve the engagement of the tissue between the jaws.