Movable Filter Screen Sheath for Emboli Capture During Instrument Passage
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Solution Overview
Problem
Current filter screen sheaths in cardiovascular intervention surgery can only intercept and capture emboli, but cannot be compatible with treatment instruments, posing a risk of distal vascular thrombosis due to detached thrombi and emboli.
Innovation Solution
A filter screen sheath with a filtering member that can axially move relative to the outer sheath tube, allowing treatment instruments to pass through while capturing emboli, featuring a frame with traction and connection wires to support the filtering member and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter screen sheath is used to intercept and capture emboli, then distal vascular thrombosis is prevented, but treatment instruments cannot pass through the filter screen
Solution Approach 1:
The filter screen sheath employs a dynamically controllable filter screen that can switch between an expanded state for emboli capture and a compressed state for instrument passage. The filter screen is mounted on a movable support structure that allows it to be pushed distally into the expanded configuration for filtration, and retracted proximally into the compressed configuration to allow treatment instruments to pass through the delivery catheter.
Solution Approach 2:
The filter screen sheath divides the filtration function from the delivery function by using a separate, movable filter screen component. The filter screen is detached from the delivery catheter structure and can be independently positioned and configured, allowing the delivery catheter to maintain its primary function of instrument delivery while the filter screen provides temporary emboli capture capability when deployed.
2Reliability
If the filter screen is expanded to capture emboli effectively, then filtration performance is improved, but the filter screen interferes with the passage of treatment instruments
Solution Approach 1:
The filter screen transitions between expanded and compressed states dynamically based on operational requirements. When emboli capture is needed, the filter screen is pushed distally to expand its filtration surface area for effective thrombus interception. When treatment instruments need to pass through, the filter screen is retracted proximally to a compressed state that minimizes its profile and allows smooth instrument passage through the delivery catheter.
Solution Approach 2:
The filter screen operates in periodic cycles of deployment and retraction. It is deployed into the expanded state before and during emboli capture phases of the procedure, then retracted into the compressed state to allow passage of treatment instruments during intervention phases, creating a rhythmic pattern of filtration and instrument access that accommodates different procedural needs.
Data Source
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AI summary
The present application relates to a filter screen sheath. The filter screen sheath includes an outer sheath tube and a filtering member capable of moving axially relative to the outer sheath tube; the filtering member includes a filter screen and a frame; the filter screen is provided with a proximal opening and a distal opening; the distal opening is communicated with a tube cavity of the outer sheath tube through the proximal opening; the frame includes a traction wire, a proximal supporting ring, and a distal supporting ring; the proximal supporting ring is connected to the proximal opening of the filter screen; the distal supporting ring is connected to the distal opening of the filter screen; and the traction wire is connected to the proximal supporting ring. The filter screen sheath of the present application allows a treatment instrument to pass through the filtering member, and the filtering member can capture an embolus in a blood vessel during treatment with the treatment instrument, thereby improving surgical safety.