Detachable Pivotable Jaw Devices for Hemostasis and Tissue Closure
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Solution Overview
Problem
Conventional hemostatic devices and clips face challenges in providing strong, effective, and less invasive solutions for gastrointestinal bleeding and tissue closure, with issues such as inadequate strength, difficult placement, and limited tissue grasping capability.
Innovation Solution
A medical device featuring pivotable jaws with a housing, biasing strips, and a driver mechanism that allows for rotational movement and secure tissue engagement, utilizing nitinol or superelastic alloys for torque transmission, and a detachable connection system for precise control and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional clips are used for hemostasis and tissue closure, then the procedure is less invasive, but the clips are not strong enough to cause permanent hemostasis and have limited tissue grasping capability
Solution Approach 1:
The device is divided into separate modular components including a housing, driver, biasing strips, and detachable jaws. This segmentation allows the jaws to be independently positioned and sized to grasp larger amounts of tissue, while the modular driver system provides enhanced rotational control for precise placement, resolving both the strength and ease of operation contradictions
Solution Approach 2:
The jaws are designed to be rotatable relative to the housing, transforming from a static clip structure to a dynamic system. This rotational capability allows the jaws to be oriented at different angles to match the tissue geometry, improving both the grasping strength and the ease of placement by enabling adjustment to various anatomical configurations
2Adaptability or versatility
If conventional clips are used for tissue closure, then the procedure is less invasive, but the clips suffer from difficult placement and limited tissue grasping capability
Solution Approach 1:
The rotatable jaws can be positioned at multiple angles relative to the housing, allowing the device to adapt to different tissue geometries and closure requirements. This dynamic adjustment capability enhances versatility in tissue grasping while the controlled rotation mechanism maintains ease of operation through systematic positioning
Solution Approach 2:
The jaws are contained within the housing in a nested configuration, allowing compact delivery through the catheter while enabling full deployment and rotation at the target site. This nesting principle resolves the contradiction by providing both enhanced adaptability when deployed and maintained ease of operation during delivery and placement
3Adaptability or versatility
If the jaws are made rotatable for better tissue engagement, then the tissue grasping capability is improved, but the device complexity increases
Solution Approach 1:
The rotational mechanism is segmented into discrete components including the driver with rack teeth and the jaws with pinion gears. This segmentation allows the rotation function to be added without overwhelming complexity, as each component has a specific, simple function that contributes to the overall tissue engagement capability
Solution Approach 2:
The driver acts as an intermediary mechanism between the drive wire and the rotatable jaws. It translates linear motion of the drive wire into rotational motion of the jaws through the rack and pinion gear system, enabling improved tissue engagement while managing device complexity through a well-defined mechanical transmission interface
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 robust, less invasive hemostasis and tissue closure by securely grasping and retaining tissue, offering improved placement and closure capabilities compared to traditional clips.
Implementation Method 1
The first and second biasing strips bias the first and second jaws radially
Implementation Method 2
utilizing nitinol or superelastic alloys for torque transmission
Data Source
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.