【能抓取体内物体的机器人史莱姆（黏液怪）！】
香港大学的研究人员开发出一种磁性史莱姆机器人，它能够穿梭于狭窄通道，抓取物体，甚至修复损坏的电路。

这种材料的特性类似于蛋奶冻：缓慢移动时呈液态，受力后会变得更加固态。这使得它能够挤过狭小的空间，同时还能抓取和操控物体。史莱姆由外部磁铁控制，无需内部电源或线路即可在体内移动。

其潜在的医疗应用是取出意外吞咽的异物。无需手术或内窥镜检查，只需将史莱姆部署到异物附近，使其抓取并利用磁力转向将其取出即可。

挑战在于安全性。使史莱姆可控的磁性颗粒具有毒性，这限制了其在人体内的使用。研究人员正在努力用生物相容性涂层包裹这些颗粒，以降低毒性并保持其磁响应性。

这是用于微创医疗的软体机器人领域的一部分。传统手术机器人结构僵硬，需要较大的切口。而由水凝胶、弹性体或磁性黏液等材料制成的软体机器人则无需切开皮肤即可在人体自然路径中穿梭。

但软体机器人的缺点在于操控性。刚性机器人定位精准，并能提供力反馈。软体机器人操控难度较大，施力也有限，但它们可以到达刚性机器人无法触及的部位。
Robo-slime that grabs objects inside your body!

Researchers at The University of Hong Kong developed a magnetic slime robot that can navigate narrow passages, grasp objects, and even fix broken electrical circuits.

The material behaves like custard: it flows when moving slowly but becomes more solid under force. This lets it squeeze through tight spaces while still being able to grip and manipulate objects. The slime is controlled using external magnets, which guide it through the body without needing internal power or wiring.

The potential medical application is retrieving accidentally swallowed objects. Instead of surgery or endoscopy, you could deploy the slime, navigate it to the object, have it grip the item, and pull it back out using magnetic steering.

The challenge is safety. The magnetic particles that make the slime controllable are toxic, which limits its use inside the human body. The researchers are working on coating the particles with a biocompatible layer to reduce toxicity while maintaining magnetic responsiveness.

This is part of a broader field of soft robotics for minimally invasive medicine. Traditional surgical robots are rigid and require large incisions. Soft robots made from materials like hydrogels, elastomers, or magnetic slimes can navigate the body's natural pathways without cutting.

The trade-off is control. Rigid robots have precise positioning and force feedback. Soft robots are harder to steer and can't apply much force, but they can reach places rigid robots can't. http://t.cn/AX5tGoEU