Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Precise navigation through the vascular system

02.07.2019

Fraunhofer MEVIS is developing intelligent catheters

Endovascular interventions are an integral part of the medical routine with 6 million procedures done worldwide annually. During the procedure, doctors insert a thin, flexible wire to navigate the catheter into the blood vessels to apply stents or remove blood clots. In order to navigate the catheter precisely through the vessels, patients undergo X-rays during the procedure.


Inserting the intelligent catheter into the vascular system, the physician can observe the position in the virtual 3D model of the patient, now, as Torben Pätz and Jan Strehlow demonstrate here.

© Fraunhofer MEVIS

One downside is that “patients and doctors are exposed to a considerable amount of radiation,” says Dr. Torben Pätz, mathematician at the Fraunhofer Institute for Digital Medicine MEVIS in Bremen.

“In addition, the X-rays merely show a 2D projection instead of a 3D image, which can sometimes impede precise localization of the catheter.” Fraunhofer MEVIS is developing a system called IntelliCath (Intelligent Catheter Navigation) to remedy these problems.

The new method uses a catheter equipped with a special optical fiber containing tiny ‘mirrors’. When light passes through the fiber, the mirrors reflect a portion of the light. Whenever the fiber bends, the reflected light changes color. This is a key feature of the method, because sensors can then measure the change in color. “The signal from the sensors gives us information about the intensity and direction of the curvature,” explains Pätz. “To some extent, the fiber knows how it is formed.”

An additional element is needed, however, for precise navigation through the vascular system. Prior to the procedure, physicians obtain CT or MR images of a patient. Based on this image data, software creates a 3D model of the vessel system and displays it on a monitor. During the endovascular procedure, live data from the fiber navigation is fed into the model. As a result, the doctor views the monitor to see how the device moves through the vascular labyrinth live and in 3D.

MEVIS experts have already been able to test the method’s feasibility using a prototype. “We connected several silicone hoses into a curved labyrinth,” says Pätz. “Then, we inserted our device containing an optical fiber into the labyrinth.” On the monitor, they were able to locate the catheter’s position in real-time with precision approaching five millimeters. The researchers have already applied for two patents.

Although several medical device companies also work on similar projects, “they expend a great deal of technical effort into trying to reconstruct the shape of the entire catheter, which can be up to two meters long,” says Pätz. “Our algorithm, however, only needs a fraction of the data to localize the catheter in a known vascular system.” As a result, the MEVIS approach promises cost-effective technology without special fibers and measurement systems and is less sensitive to measurement errors than previous approaches.

Next, the experts will test the IntelliCath system on both a full-body phantom of the human vascular system and a pig lung. Towards the end of the current project phase in 2020, a prototype will be ready to serve as a foundation for a clinical trial.

In addition, Pätz and his team are developing acoustic feedback to relieve doctors of the constant need to view at the monitor. The idea is to employ various indication sounds to signal how far the next vessel junction is and in which direction the catheter should be inserted. “It is similar to a car’s parking assistance system,” explains Pätz, “where you also receive acoustic indications about the distance to the next obstacle.”

IntelliCath is a part of the more comprehensive SAFE project (Software support and assistance systems for minimally invasive neurovascular procedures). Its goal is to support physicians by facilitating X-ray navigation during catheter procedures. For example, software can display supplementary information extracted from CT or MR images into the live X-ray image.

Furthermore, AI will be able to automatically detect the position of the catheter. The project partners at the project group for Automation in Medicine and Biotechnology at the Fraunhofer Institute for Manufacturing Engineering and Automation IPA are developing an intelligent assistance system to support catheter procedures from support for manual navigation of the catheter to completely automatic navigation. SAFE is a Fraunhofer project with funding of 2.4 million euros. It commenced in April 2017 and will end in September 2020.

Weitere Informationen:

https://www.mevis.fraunhofer.de/en/press-and-scicom/press-release/2019/precise-n...

Bianka Hofmann | Fraunhofer-Institut für Digitale Medizin MEVIS

Further reports about: 3D Automation Fraunhofer-Institut X-ray catheter fiber optical fiber vascular vascular system

More articles from Medical Engineering:

nachricht Non-invasive view into the heart
24.06.2019 | Goethe-Universität Frankfurt am Main

nachricht New imaging modality targets cholesterol in arterial plaque
14.06.2019 | SPIE--International Society for Optics and Photonics

All articles from Medical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First results of the new Alphatrap experiment

Physicists at the Max Planck Institute for Nuclear Physics in Heidelberg report the first result of the new Alphatrap experiment. They measured the bound-electron g-factor of highly charged (boron-like) argon ions with unprecedented precision of 9 digits. In comparison with a new highly accurate quantum electrodynamic calculation they found an excellent agreement on a level of 7 digits. This paves the way for sensitive tests of QED in strong fields like precision measurements of the fine structure constant α as well as the detection of possible signatures of new physics. [Physical Review Letters, 27 June 2019]

Quantum electrodynamics (QED) describes the interaction of charged particles with electromagnetic fields and is the most precisely tested physical theory. It...

Im Focus: Experimental physicists redefine ultrafast, coherent magnetism

For the first time ever, experimental physicists have been able to influence the magnetic moment of materials in sync with their electronic properties. The coupled optical and magnetic excitation within one femtosecond corresponds to an acceleration by a factor of 200 and is the fastest magnetic phenomenon that has ever been observed.

Electronic properties of materials can be directly influenced via light absorption in under a femtosecond (10-15 seconds), which is regarded as the limit of...

Im Focus: Fraunhofer IDMT demonstrates its method for acoustic quality inspection at »Sensor+Test 2019« in Nürnberg

From June 25th to 27th 2019, the Fraunhofer Institute for Digital Media Technology IDMT in Ilmenau (Germany) will be presenting a new solution for acoustic quality inspection allowing contact-free, non-destructive testing of manufactured parts and components. The method which has reached Technology Readiness Level 6 already, is currently being successfully tested in practical use together with a number of industrial partners.

Reducing machine downtime, manufacturing defects, and excessive scrap

Im Focus: Successfully Tested in Praxis: Bidirectional Sensor Technology Optimizes Laser Material Deposition

The quality of additively manufactured components depends not only on the manufacturing process, but also on the inline process control. The process control ensures a reliable coating process because it detects deviations from the target geometry immediately. At LASER World of PHOTONICS 2019, the Fraunhofer Institute for Laser Technology ILT will be demonstrating how well bi-directional sensor technology can already be used for Laser Material Deposition (LMD) in combination with commercial optics at booth A2.431.

Fraunhofer ILT has been developing optical sensor technology specifically for production measurement technology for around 10 years. In particular, its »bd-1«...

Im Focus: The hidden structure of the periodic system

The well-known representation of chemical elements is just one example of how objects can be arranged and classified

The periodic table of elements that most chemistry books depict is only one special case. This tabular overview of the chemical elements, which goes back to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on UV LED Technologies & Applications – ICULTA 2020 | Call for Abstracts

24.06.2019 | Event News

SEMANTiCS 2019 brings together industry leaders and data scientists in Karlsruhe

29.04.2019 | Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

 
Latest News

Remote but remarkable: Illuminating the smallest inhabitants of the largest ocean desert

02.07.2019 | Life Sciences

High-speed connectivity everywhere: IHP coordinates project on large scale test of 5G mobile networks

02.07.2019 | Information Technology

New measurements shed light on the impact of water temperatures on glacier calving

01.07.2019 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>