Guidewire Stop Friction Locking for Embolic Filter Placement
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Solution Overview
Problem
Existing guidewire systems face challenges in accurately positioning medical devices, such as embolic filters, within the body lumen due to difficulties in simultaneously extending the guidewire for stabilization and placing a filter close to the treatment site to capture embolic debris, as precise placement using fluoroscopic observation is challenging with built-in filter stops.
Innovation Solution
A user-actuatable guidewire stop that includes a locking tube and a locking element in frictional engagement with the guidewire, allowing for precise placement and locking of medical devices along the guidewire at any desired location within the body lumen, using an actuator to switch between unlocked and locked configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a built-in filter stop is used for accurate placement of the embolic filter, then the filter can be positioned close to the treatment site, but the guidewire cannot extend far enough into the body lumen to stabilize the treatment site
Solution Approach 1:
The invention divides the stop mechanism into separate components: a stop member that can be detached from the filter and a guidewire with a stop receptacle. This segmentation allows the guidewire to extend independently for stabilization while the filter stop member can be precisely positioned and locked into the receptacle for accurate filter placement.
Solution Approach 2:
The stop member acts as an intermediary component between the filter and the guidewire. It can be attached to the filter, positioned along the extended guidewire to the desired location, and then locked into place using the actuator mechanism, thereby mediating between the need for guidewire extension and filter placement accuracy.
2Stability of the object's composition
If the guidewire is extended far into the body lumen to stabilize the treatment site, then the treatment site stabilization is improved, but the filter cannot be positioned close to the treatment site
Solution Approach 1:
The stop mechanism is designed to be dynamic rather than fixed. The stop member can be moved along the guidewire to different positions, and the actuator allows for dynamic locking and unlocking. This enables the system to first extend the guidewire for stabilization, then dynamically position the filter stop member at the precise location needed for filter placement.
3Device complexity
If a preassembled filter on guidewire is used, then the device structure is simplified, but the user cannot determine precisely where the medical device is to be placed
Solution Approach 1:
The system is segmented into modular components: a filter, a detachable stop member, and a guidewire with a stop receptacle. This segmentation maintains relative structural simplicity while enabling precise user-controlled placement, as the stop member can be independently positioned and locked at the desired location.
Solution Approach 2:
The actuator mechanism allows the user to self-service the positioning process by easily locking and unlocking the stop member at the desired location without requiring complex pre-programming or external assistance. The user has direct control over the precise placement of the filter.
4Loss of information
If fluoroscopic observation is used for stop placement, then the placement can be visualized, but accurate placement is very difficult to achieve
Solution Approach 1:
The invention replaces the purely visual/mechanical fluoroscopic observation method with a mechanical locking system. The actuator mechanism provides tactile and mechanical feedback for precise stop placement, reducing reliance on fluoroscopic visualization and enabling more accurate placement through direct mechanical control.
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
Enables precise placement and locking of medical devices on a guidewire, allowing for effective trapping of embolic debris and stabilization of the treatment site, improving the accuracy and safety of vascular intervention procedures.
Implementation Method 1
a locking element disposed between the guidewire and the locking tube and in frictional engagement with at least the guidewire in the locked configuration
Data Source
AI summary
A guidewire stop is disclosed which can be positioned and frictionally locked to a bare guidewire at a user-defined location. The guidewire stop can be used to stop and/or lock a medical device, such as an embolic filter, at a treatment site inside a body lumen. The medical device may be attached to the guidewire stop.