Fast-Response Variable-Stiffness Magnetic Catheters for Minimally Invasive Surgery.
Adv Sci (Weinh)
; 11(12): e2305537, 2024 Mar.
Article
en En
| MEDLINE
| ID: mdl-38225742
ABSTRACT
In minimally invasive surgery, such as cardiac ablation, magnetically steered catheters made of variable-stiffness materials can enable higher dexterity and higher force application to human tissue. However, the long transition time between soft and rigid states leads to a significant increase in procedure duration. Here, a fast-response, multisegmented catheter is described for minimally invasive surgery made of variable-stiffness thread (FRVST) that encapsulates a helical cooling channel. The rapid stiffness change in the FRVST, composed of a nontoxic shape memory polymer, is achieved by an active cooling system that pumps water through the helical channel. The FRVST displays a 66 times stiffness change and a 26 times transition enhancement compare with the noncooled version. The catheter allows for selective bending of each segment up to 127° in air and up to 76° in water under an 80 mT external magnetic field. The inner working channel can be used for cooling an ablation tip during a procedure and for information exchange via the deployment of wires or surgical tools.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Procedimientos Quirúrgicos Mínimamente Invasivos
/
Catéteres
Límite:
Humans
Idioma:
En
Revista:
Adv Sci (Weinh)
Año:
2024
Tipo del documento:
Article
País de afiliación:
Suiza
Pais de publicación:
Alemania