Filter Device with Dynamic Opening Control for Emboli Capture
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Solution Overview
Problem
Existing filter devices for protecting peripheral vessels during atherectomy surgeries lack mechanisms to easily change the indwelling position and efficiently capture emboli, often resulting in incomplete control of the filter opening, allowing emboli to pass downstream due to entanglement with rotational movements or separation from the blood vessel wall.
Innovation Solution
A filter device with a core member, push member, and movable tubes, featuring a ring with elasticity or shape-memory ability, where first and second wires deform the ring to reduce the opening diameter and expand it for easy positioning and emboli capture, allowing the device to be used as a guidewire for delivering an atherectomy device and efficiently capturing emboli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the filter device is used as a guidewire for delivering an atherectomy device, then the device can navigate to target sites and deliver treatment equipment, but the filter opening may become entangled with rotational movements during surgery
Solution Approach 1:
The filter opening is designed with dynamic control capability, allowing it to change its state between open and closed configurations. The opening can be closed during rotational movements of the atherectomy device to prevent entanglement, and opened when needed for emboli capture. This dynamic adjustment resolves the contradiction between maintaining guidewire functionality and ensuring reliable filter control during surgical operations.
2Reliability
If the filter opening is made large to capture emboli effectively, then emboli capture efficiency improves, but the device cannot be easily repositioned along the blood vessel
Solution Approach 1:
The filter opening diameter is dynamically adjustable between large and small configurations. When a large opening is needed for effective emboli capture, the filter can be opened. When repositioning is required, the opening can be closed to reduce the device profile and facilitate movement along the blood vessel. This dynamic size adjustment resolves the contradiction between emboli capture efficiency and repositioning ease.
3Ease of operation
If the filter device structure is simplified for ease of use, then operational simplicity improves, but the ability to control opening diameter and maintain positioning is reduced
Solution Approach 1:
The filter opening control mechanism utilizes the self-expanding properties of the filter structure, which naturally tends to expand to its predetermined shape. The closing mechanism works against this natural tendency, requiring controlled application of force to close the opening. This self-service approach simplifies the overall system by leveraging the filter's inherent properties rather than requiring complex active control systems for both opening and closing operations.
4Object-affected harmful factors
If the filter opening is kept closed to prevent emboli passage, then downstream protection improves, but the filter cannot effectively capture emboli
Solution Approach 1:
The filter opening operates with periodic action, alternating between open and closed states based on surgical requirements. The opening is opened to capture emboli and then closed to prevent their downstream passage. This periodic opening and closing cycle allows the filter to perform both functions - capturing emboli and protecting downstream vessels - at different times, resolving the contradiction between these two protective functions.
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 filter device enables easy repositioning and efficient capture of emboli, preventing downstream passage during atherectomy surgeries by maintaining stable filter positioning and controlled opening diameters, even during rotational movements and in curved vessel sections.
Implementation Method 1
a ring (32) fixed to the opening and having elasticity or shape-memory ability
Implementation Method 2
a ring (32) fixed to the opening and having elasticity or shape-memory ability
Implementation Method 3
two first wires (41), one end of each first wire being fixed to the third tube (25), and the other end being fixed to part of the ring (32); and two second wires (42), one end of each second wire being fixed to part of the ring (32), and the other end being fixed to the second tube (24)
Data Source
AI summary
A filter device includes: a core member; a push member; first, second and third tubes; a first restriction member disposed on the first tube and configured to restrict a pushing movement of the third tube to the distal direction; a filter; a ring fixed to the opening; first and second wires, wherein the filter is configured in such a manner that the diameter of the opening is reduced by deformation of the shape of the ring, the deformation being caused by the first wires and the second wires when the push member fixed to the core member is pushed with the push member in contact with the second tube, and in such a manner that the diameter of the opening is expanded by restoration of the ring to the original shape, the restoration being caused by separating the push member fixed to the core member from the second tube.