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 A whole-body approach to understanding chemosensory cells
13.12.2017 | Tokyo Institute of Technology

nachricht Research reveals how diabetes in pregnancy affects baby's heart
13.12.2017 | University of California - Los Angeles Health Sciences

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: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

A whole-body approach to understanding chemosensory cells

13.12.2017 | Health and Medicine

Water without windows: Capturing water vapor inside an electron microscope

13.12.2017 | Physics and Astronomy

Cellular Self-Digestion Process Triggers Autoimmune Disease

13.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>