Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New magnetic percutaneous system navigates vessels

08.11.2004


A new magnetic navigation system shows promise for use during percutaneous coronary interventions (PCI), researchers reported at the American Heart Association’s Scientific Sessions 2004.



"The computer-controlled magnetic system is useful to steer guide wires and navigate turns in tortuous coronary arteries that would otherwise be impossible to negotiate," said study co-author Neal S. Kleiman, M.D., director of cardiac catheterization laboratories at the Methodist DeBakey Heart Center and associate professor of medicine at Baylor College of Medicine in Houston, Texas.

The magnetic-assisted intervention is being introduced in the United States and Europe, with fewer than 15 systems installed at institutions worldwide. Developed by Stereotaxis, Inc., a St. Louis firm, the system was approved by the U.S. Food and Drug Administration in 2003.


The researchers presented a study of the first 26 patients who underwent 31 magnetic-assisted interventions (MAI) at the Methodist DeBakey Heart Center, leading to a high success rate. The three-dimensional system is installed in the center’s catherization laboratory.

The system consists of two permanent magnets that generate a magnetic field over the heart and a magnet-tipped coronary guide wire. The magnetic navigation involves interaction between the magnetic field of specified direction and magnitude, positioned externally to the patient, and a tiny magnet in the tip of the interventional device. An automatic advancement system controls the catheter advancement and retraction.

Kleiman said the magnetic system is useful in patients with difficult lesions who are undergoing a coronary intervention, such as balloon angioplasty. He said the more tortuous the vessel, the more difficult it is to place the wire manually.

"About 20 percent of patients treated with the magnetic system were poor candidates for standard angioplasty or had already failed the standard procedure," Kleiman said. "These are the patients who can benefit from the magnetic navigation system." However, he noted that the magnetic system is not for use in every case.

Cardiology fellow Satya Reddy Atmakuri, M.D., lead author of the study, reported that 26 male and female patients, with an average age of 64, were selected because of their potentially difficult to cross lesions during angioplasty.

Fifty-four percent of the patients had diabetes mellitus, a patient population especially vulnerable to cardiovascular disease that often has tortuous vessels.

The study found that most stenoses (48 percent) were in the circumflex coronary artery (which supplies the back wall of the heart and usually poses a challenge to the interventionalist because of its many bends and sharp angles) and its branches, 22.5 percent were in the left anterior descending artery (which supplies the front wall of the heart) and 20 percent were in the right coronary artery. Saphenous vein grafts represented 10 percent.

The target lesion was successfully crossed using MAI in 28 of 31 lesions, a 90 percent success rate, Atmakuri said. Two lesions were successfully crossed with the wire, but the balloon could not cross the lesion, leading to a success rate of 84 percent.

Kleiman said the magnetic navigation system has the potential to allow coronary interventions to be done more quickly than conventional guide wire techniques. Its major advantage is the ability to treat tortuous vessels.

"Just how broad a niche this technique will occupy is not yet clear," Kleiman said. He said there is a steep learning curve, but the intervention will become easier to use with experience and upgraded software.

Co-authors are cardiology fellow Eli I. Lev, M.D., and Albert E. Raizner, M.D., director of The Methodist DeBakey Heart Center.

Carole Bullock | EurekAlert!
Further information:
http://www.heart.org

More articles from Health and Medicine:

nachricht Cholesterol-lowering drugs may fight infectious disease
22.08.2017 | Duke University

nachricht Once invincible superbug squashed by 'superteam' of antibiotics
22.08.2017 | University at Buffalo

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

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

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>