Detachable Pivotable Jaws for Permanent Hemostasis
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Solution Overview
Problem
Conventional hemostatic devices and clips are not strong enough to achieve permanent hemostasis and face challenges with difficult placement and limited tissue grasping capacity, particularly in gastrointestinal applications, leading to incomplete closure of perforations.
Innovation Solution
A medical device with a housing, jaws, and a driver mechanism that includes a deformable frame and locking leg, allowing for precise tissue engagement and secure locking through a combination of longitudinal movement and deformation, enabling effective grasping and retention of tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hemostatic devices and clips are used, then the procedure is simple, but the devices are not strong enough to achieve permanent hemostasis
Solution Approach 1:
The driver is divided into three distinct portions: a proximal portion, an intermediate portion with a deformable frame, and a distal portion. This segmentation allows each part to perform specific functions - the proximal portion engages the drive wire, the intermediate portion deforms to activate locking legs, and the distal portion engages the jaws - thereby achieving strong tissue engagement through a structured, multi-component design.
Solution Approach 2:
The frame in the intermediate portion is designed to be deformable, transitioning from a compressed state during delivery to an expanded state upon application of longitudinal force differential. This dynamic deformation activates the locking legs to engage the driver guide surface, providing secure locking and strong hemostatic effect while maintaining device flexibility during insertion.
2Ease of operation
If traditional clips are used for closing perforations, then the placement is straightforward, but the capability to grasp tissue is limited resulting in incomplete closure
Solution Approach 1:
The jaws are designed to be rotatable relative to the housing, changing their orientation parameter from a parallel alignment to a crossed configuration. This rotation, driven by longitudinal movement of the driver, transforms the grasping geometry to enable effective closure of perforations and secure tissue engagement, thereby improving adaptability while maintaining ease of operation through a single actuation mechanism.
3Device complexity
If conventional clips are used, then the device structure is simple, but the placement difficulty increases and tissue grasping capability is limited
Solution Approach 1:
The driver is disposed within the housing's internal passageway, with the proximal portion of the driver positioned near the proximal end of the housing and the distal portion near the distal end. This nested arrangement allows the complex driver mechanism to be delivered through a simple endoscope or delivery catheter, maintaining overall device simplicity while enabling sophisticated tissue engagement functions during placement.
4Reliability
If the frame deforms under longitudinal force differential, then the locking leg engages the driver guide surface for secure locking, but the neck may break under second predetermined longitudinal force differential
Solution Approach 1:
The frame is designed to deform first under a predetermined longitudinal force differential, activating the locking legs to engage the driver guide surface and secure the driver in place. Only after this preliminary locking action does the neck become susceptible to breaking under a second, greater force differential. This sequential activation ensures reliable locking before potential detachment, preventing premature failure while maintaining structural integrity during normal operation.
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 secure means of achieving permanent hemostasis with improved tissue engagement and closure capabilities, reducing the need for invasive surgery and minimizing side effects.
Implementation Method 1
The frame is deformable such that a predetermined longitudinal force differential between the proximal portion and distal portion of the driver causes the frame to deform and the locking leg to move away from the longitudinal axis into a locking position
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.