Retrieval Device End Effector Loop Dynamics
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Solution Overview
Problem
Current retrieval devices have limitations in capturing and releasing larger objects due to the size of their front loop, and they often require a low-profile state for insertion and withdrawal, which can be challenging for procedures involving varying object sizes.
Innovation Solution
A retrieval device with a distally located end effector that can move between a contracted and expanded state, featuring a plurality of support members and movable members that can be longitudinally extended and twisted without moving the support members, forming multiple loops to accommodate different object sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the front loop size of the end effector is increased to capture larger objects, then the capability to handle larger objects is improved, but the device profile becomes larger making insertion and withdrawal more difficult
Solution Approach 1:
The end effector is designed with movable members that can change the configuration and size of the front loop dynamically. The movable members can be positioned to create a larger front loop for capturing larger objects or retracted to create a smaller profile for insertion and withdrawal, allowing the device to adapt its profile size based on operational needs
Solution Approach 2:
The end effector is divided into support members and movable members that can move independently relative to each other. This segmentation allows the movable members to be repositioned along the support members to adjust the front loop size, enabling the device to optimize between capture capability and profile size
2Adaptability or versatility
If the end effector is designed with a fixed large front loop to capture larger objects, then the capture capability is improved, but the device cannot be easily inserted or withdrawn through narrow passages
Solution Approach 1:
The end effector transitions from a fixed configuration to a dynamic configuration where movable members can be repositioned. During insertion and withdrawal, the movable members are retracted to minimize the profile, and during object capture, they are extended to maximize the front loop size, providing both ease of operation and capture capability
3Length of moving object
If the end effector is designed with a small front loop for easy insertion and withdrawal, then the device profile is reduced, but the capability to capture larger objects is limited
Solution Approach 1:
The end effector uses movable members that can be dynamically repositioned to transform the small front loop into a larger capture loop when needed. The movable members can be extended along the support members to increase the front loop size for capturing larger objects, while maintaining a compact profile during insertion and withdrawal phases
Data Source
AI summary
According to an embodiment of the present disclosure, a retrieval device may include a distally located end effector movable between a contracted state and an expanded state. The end effector may include a plurality of support members each including a passage. The end effector may also include a plurality of movable members. A first movable member may include a first portion extending into a first passage of the support member passages. The retrieval device may also include a proximally located handle assembly including a longitudinal actuator and a twisting actuator coupled to the plurality of movable members. The longitudinal actuator and twisting actuator may be configured to longitudinally move and twist the movable members without longitudinally moving and twisting the support members.