Intravascular Stent Delivery Device Positioning Member Axial Control
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Solution Overview
Problem
Existing delivery devices for intravascular stents face challenges in controlling the displacement of the stent during release, due to high friction forces between the stent and the outer sheath catheter.
Innovation Solution
A delivery device equipped with an inner core tube and positioning members arranged in the loading region, which axially interfere with the corrugated rings of the intravascular stent, preventing excessive displacement during delivery or release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer sheath catheter is used to compress and deliver the intravascular stent, then the stent can be loaded and delivered effectively, but the high friction force between the stent and outer sheath catheter causes the stent to have large axial displacement during release
Solution Approach 1:
The positioning member acts as an intermediary between the inner core tube and the corrugated rings of the stent. It provides axial interference with the corrugated rings to restrict axial movement during release, while allowing radial compression during loading. This mediator resolves the contradiction by enabling controlled axial displacement through mechanical interference without compromising delivery reliability.
2Ease of manufacture
If the push rod length is made less than the sheath core tube length to create a loading region, then the stent can be compressed and loaded, but the stent is easily driven by the outer sheath catheter to have large displacement during release
Solution Approach 1:
The positioning member is pre-installed on the inner core tube in the loading region before stent delivery. It performs preliminary action by establishing axial interference relationships with the corrugated rings, preparing the mechanical constraint system in advance. This ensures that when release occurs, the stent position is controlled from the beginning of the release process, improving position control precision while maintaining ease of loading region configuration.
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 positioning members effectively restrict the axial movement of the intravascular stent, preventing large displacements and ensuring controlled deployment and release.
Implementation Method 1
Because of an extremely large friction force between the covered stent and the outer sheath catheter, the covered stent is easily driven by the outer sheath catheter to have a large displacement
Data Source
AI summary
A delivery device (100) and an intravascular stent (200) system are provided. The delivery device (100) is used for delivering an intravascular stent (200), the intravascular stent (200) including a plurality of corrugated rings (213). The delivery device (100) includes an inner core tube (121), the inner core tube (121) having a loading region (132) for loading the intravascular stent (200). The delivery device (100) further includes at least one positioning member (151) arranged on the inner core tube (121), where the positioning member (151) is located in the loading region (132), and during delivery or release of the intravascular stent (200) by the delivery device (100), the positioning member (151) can axially interfere with at least one of the plurality of corrugated rings (213). The delivery device (100) can prevent axial displacement of the intravascular stent (200) in the loading or release process.