Occluder Delivery Handle With Shape-Memory Expansion Control
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Solution Overview
Problem
Existing occluders made of shape memory alloys are permanently left in the body due to non-degradability, while those made of absorbable polymers lack elasticity and shape memory characteristics, making it difficult to restore an expanded state for effective occlusion.
Innovation Solution
A delivery device with a regulating member and a first driving assembly that controls the axial displacement of the occluder, using a shape memory metal material to shape the occluder into an expanded state for effective occlusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shape memory alloy material is used for the occluder, then the occluder has excellent elasticity and can return to the original shape, but the material cannot be degraded and will be permanently left in the body
Solution Approach 1:
The patent uses a composite structure where a shape memory alloy regulating member provides mechanical support and shape memory function, while an absorbable polymer coating layer provides biocompatibility and degradation. This composite approach allows the occluder to maintain excellent elasticity and shape recovery capability while enabling gradual degradation and absorption by the body, resolving the contradiction between permanent structural integrity and temporary biological presence.
2Object-generated harmful factors
If absorbable polymer material is used for the occluder, then the material can be degraded and absorbed by the body, but the material lacks elasticity and shape memory characteristic
Solution Approach 1:
The patent combines absorbable polymer material for the occluder body with a shape memory alloy regulating member that provides mechanical reinforcement and shape memory function. The polymer material maintains degradability and biocompatibility while the alloy regulating member ensures the occluder can return to its original shape and form effective occlusion, resolving the contradiction between temporary presence and structural functionality.
Solution Approach 2:
The shape memory alloy regulating member acts as an intermediary element within the polymer occluder structure. It provides the necessary mechanical support and shape memory characteristics to the otherwise soft polymer material, enabling the occluder to maintain its shape and recoverability while the polymer outer layer provides biocompatibility and degradation properties.
3Object-generated harmful factors
If polymer material is used for the occluder, then the occluder can be degraded without residual materials, but the occluder cannot be restored to an expanded state after release
Solution Approach 1:
The patent creates a composite occluder system where the shape memory alloy regulating member provides the mechanical framework for shape restoration, while the absorbable polymer coating provides biocompatibility and complete degradation. The alloy component ensures the occluder can be effectively deployed and restored to its functional expanded state, while the polymer component ensures complete degradation without residues, resolving the contradiction between ease of operation and complete degradation.
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 device enables the occluder to be shaped and expanded for effective occlusion, ensuring complete degradation without residual materials in the body.
Implementation Method 1
a regulating member, wherein in a natural state, the regulating member includes a bent section, and an end of the regulating member that is away from the bent section extends into the accommodating cavity; and a first driving assembly, arranged on the operating handle, connected to the regulating member, and configured to control an axial displacement of the regulating member, so that the bent section of the regulating member abuts against an implantable instrument to achieve shaping of the implantable instrument
Data Source
AI summary
A delivery device (40) and a delivery system (100) are provided. The delivery device (40) includes an operating handle (410), a regulating member (420) and a first driving assembly (450), where the operating handle (410) includes an accommodating cavity; in a natural state, the regulating member (420) includes a bent section (422), and an end of the regulating member (420) that is away from the bent section (422) extends into the accommodating cavity; the first driving assembly (450) is arranged on the operating handle (410), is connected to the regulating member (420), and is configured to control an axial displacement of the regulating member (420), so that the bent section (422) of the regulating member (420) abuts against an implantable instrument to realize forming of the implantable instrument. The delivery device (40) can form the implantable instrument.