Shape Memory Polymer-Based Endovascular Devices: Design Criteria and Future Perspective

Area of Science:

• Biomaterials Science
• Endovascular Surgery
• Medical Device Engineering

Background:

• Current endovascular devices for intracranial aneurysms (ICAs) have suboptimal rates of lasting complete occlusion, leading to recurrence and re-operation.
• Residual flow within aneurysm sacs is a primary cause of treatment failure and subsequent clinical complications.

Purpose of the Study:

• To review the limitations of existing endovascular devices for ICA embolization.
• To explore the potential of patient-specific shape memory polymers (SMPs) as an alternative therapy.
• To discuss the fabrication, actuation, and application of SMPs for improved ICA treatment.

Main Methods:

• Review of current literature on endovascular embolization devices for ICAs.
• Analysis of shape memory polymer properties and fabrication techniques.
• Evaluation of SMPs' potential for patient-specific aneurysm treatment.

Main Results:

• Existing devices often fail to achieve complete and durable occlusion of intracranial aneurysms.
• Shape memory polymers offer tunable properties adaptable to individual aneurysm geometries and hemodynamics.
• SMPs demonstrate potential as a coil-free endovascular therapy for ICAs.

Conclusions:

• Patient-specific SMPs represent a promising avenue for enhancing complete occlusion rates in ICA embolization.
• Further development is required to address existing limitations before widespread clinical application of SMPs.
• SMPs could offer a more effective, coil-free treatment for intracranial aneurysms.