Robohub.org
 

Octopus points to the future for keyhole surgery


by
02 May 2016



share this:

Octopusby Rex Merrifield

Keyhole, or minimally invasive, surgery can offer many benefits over more traditional, open operations, including reduced risk of infections, quicker recovery times and less scarring. But internal organs can get in the way when hard robotic arms are used, given that access can be very limited and soft tissue can sometimes move in unexpected ways.

The EU-funded STIFF-FLOP project has designed, built and operated a soft robotic arm that can squeeze into the body, manoeuvre gently around soft tissue, reconfigure itself, and stiffen to perform tasks that need force.

‘The aim is to develop soft robotics systems that can elongate, bend and move around organs,’ said project coordinator Professor Kaspar Althoefer who conducted the research at King’s College London, UK, and is now at Queen Mary University of London, UK.

‘The octopus provided some inspiration. It has no bones or skeletal structure, and it can squeeze through very narrow openings, but stiffen when required,’ he said.

The robotic arm works through a combination of air and granules. When air is pumped in, the granules inside it are able to move freely and allow both flexibility and a large range of motion. When the air is sucked out again, the granules clump together, making the structure stiff and rigid in the required position.

The system also helps surgeons to deal with complex soft tissue movements and uncertain situations, such as when organs shift, or move with the patient’s breathing and heartbeat.

With keyhole surgery, the instruments are inserted through narrow openings and they have to pivot around that small incision. And because the surgeon is unable to use a hand directly to feel inside the body, for example to identify the borders of a tumour, a successful operation is dependent on visual feedback from a camera at the end of the robotic arm.

Researchers have developed a prototype of an arm that can stiffen or become flexible on demand. Image courtesy of StiffFlop

Researchers have developed a prototype of an arm that can stiffen or become flexible on demand. Image courtesy of StiffFlop

So among the next steps is developing technology allowing surgeons to receive feedback from the operation site through touch, a field known as haptics.

In addition to joysticks and data gloves, haptic devices include possibilities such as vibratory actuators and pressure pads on the surgeon’s arm to simulate the feeling of operating through a much larger incision.

Dr Helge Wurdemann, project manager of STIFF-FLOP, said: ‘In particular, haptics has great potential to offer benefits to surgeons but, more importantly, to patients’ outcomes, when it comes to interventions that are less and less invasive.’

Cadaver

The STIFF-FLOP project put the soft robotic arm through a series of successful tests on a cadaver. The collaborators are now developing it further, with a view to possibly testing it in veterinary surgery, and eventually in operations on live people.

‘We have demonstrated the feasibility of the approach and so we would like to try it out on a living system, though that will require much further development,’ Prof. Althoefer said.

Other EU-supported researchers have been working to improve the software that controls surgical robots and tools such as graspers or scalpels and provide the surgeons who use them with the sense of touch when tissue is palpated, grasped or cut.

‘Any kind of design choice, any kind of device, any new control system, has to be grounded in what we as motor neuroscientists understand about how people control motion and perceive information,’ said Dr Ilana Nisky, senior lecturer in the Department of Biomedical Engineering and head of the Biomedical Robotics Lab at Ben-Gurion University of the Negev, Israel.

It can squeeze through very narrow openings, but stiffen when required. Professor Kaspar Althoefer, King’s College London, UK

‘From the side of the surgeon, we are developing the software that will make them feel as if they are present there, so that it is really natural,’ added Dr Nisky, whose TELEPRESENCE SURGERY project has been developing new control software for existing robotic surgical equipment.

Her research has found that very experienced surgeons operating with robotic equipment use a far greater ‘toolbox’ of hand and arm movements in carrying out operations than novices do. While experience obviously brings increased skill, the contrast was much bigger than expected and was present even in the performance of very basic motor tasks that do not require surgical knowledge. Those findings provided inspiration for further developments in robotic arms and controls.

‘We hope that eventually robots will make it easier to learn how to use them too,’ Dr Nisky said. ‘Lead surgeons can do marvellous things with the robots, and by improving the controls and systems we hope that will shorten the learning curve for novices and they will be able to master complicated procedures faster.’

More info:

STIFF-FLOP

TELEPRESENCE SURGERY



tags: , ,


Horizon Magazine brings you the latest news and features about thought-provoking science and innovative research projects funded by the EU.
Horizon Magazine brings you the latest news and features about thought-provoking science and innovative research projects funded by the EU.





Related posts :



Robot Talk Episode 126 – Why are we building humanoid robots?

  20 Jun 2025
In this special live recording at Imperial College London, Claire chatted to Ben Russell, Maryam Banitalebi Dehkordi, and Petar Kormushev about humanoid robotics.

Gearing up for RoboCupJunior: Interview with Ana Patrícia Magalhães

and   18 Jun 2025
We hear from the organiser of RoboCupJunior 2025 and find out how the preparations are going for the event.

Robot Talk Episode 125 – Chatting with robots, with Gabriel Skantze

  13 Jun 2025
In the latest episode of the Robot Talk podcast, Claire chatted to Gabriel Skantze from KTH Royal Institute of Technology about having natural face-to-face conversations with robots.

Preparing for kick-off at RoboCup2025: an interview with General Chair Marco Simões

and   12 Jun 2025
We caught up with Marco to find out what exciting events are in store at this year's RoboCup.

Interview with Amar Halilovic: Explainable AI for robotics

  10 Jun 2025
Find out about Amar's research investigating the generation of explanations for robot actions.

Robot Talk Episode 124 – Robots in the performing arts, with Amy LaViers

  06 Jun 2025
In the latest episode of the Robot Talk podcast, Claire chatted to Amy LaViers from the Robotics, Automation, and Dance Lab about the creative relationship between humans and machines.

Robot Talk Episode 123 – Standardising robot programming, with Nick Thompson

  30 May 2025
In the latest episode of the Robot Talk podcast, Claire chatted to Nick Thompson from BOW about software that makes robots easier to program.

Congratulations to the #AAMAS2025 best paper, best demo, and distinguished dissertation award winners

  29 May 2025
Find out who won the awards presented at the International Conference on Autonomous Agents and Multiagent Systems last week.



 

Robohub is supported by:




Would you like to learn how to tell impactful stories about your robot or AI system?


scicomm
training the next generation of science communicators in robotics & AI


©2025.05 - Association for the Understanding of Artificial Intelligence


 












©2025.05 - Association for the Understanding of Artificial Intelligence