Magnetically Controlled Delivery of Injectable Magnetoactive Adhesive Hydrogel for Vascular Repair in the Challenging...

Area of Science:

• Biomaterials Science
• Vascular Surgery
• Medical Devices

Background:

• Vascular repair in the complex blood environment is challenging.
• Current methods like non-adhesive sealants and vessel coiling have limitations.
• Developing effective injectable materials for in-situ vascular repair is crucial.

Purpose of the Study:

• To introduce an injectable magnetoactive adhesive hydrogel (iMAH) for vascular repair.
• To demonstrate the magnetic guidance and rapid adhesion capabilities of iMAH in dynamic blood conditions.
• To evaluate the efficacy of iMAH in a large-animal model for sealing ruptured arteries.

Main Methods:

• Development of an injectable magnetoactive adhesive hydrogel (iMAH) with biocompatible components.
• Utilizing magnetic actuation for targeted delivery and precise deployment of iMAH.
• In vitro investigation of iMAH adhesion strength and fluid-displacement capabilities.
• In vivo demonstration of iMAH vascular repair in a large-animal beagle dog model using a magnetic vascular robot.

Main Results:

• iMAH demonstrated rapid crosslinking (approx. 2 seconds) and strong adhesion to vessel surfaces under dynamic blood flow.
• Magnetic actuation facilitated targeted delivery and efficient adhesion by squeezing out interfacial fluid.
• Successful embolization of branching lumbar arteries in a beagle dog model was achieved using magnetically guided iMAH.
• The study confirmed the potential of iMAH for sealing ruptured vessels and embolizing abnormal arteries.

Conclusions:

• Injectable magnetoactive adhesive hydrogel (iMAH) presents a promising advancement in vascular repair.
• Magnetically controlled delivery of iMAH offers a precise and effective solution for challenging vascular defects.
• This technology has significant potential for clinical applications in treating ruptured or abnormal arteries.