Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Mechanomyography to be accurate in detecting nerves during minimally invasive spine surgery

16.03.2010
An electronic device is an accurate technique for locating and avoiding nerves during spinal procedures, suggests a study by Henry Ford Hospital researchers.

The issue becomes important for patients as the demand for minimally invasive surgical techniques continues to grow, so does the need for effective methods for monitoring the location of nerves during surgery to avoid damage to them.

Mechanomyography (MMG) systems function by measuring the mechanical response of muscle following nerve stimulation, compared to traditional techniques that monitor the electrical response of muscle using electromyography (EMG). EMG systems are widely used as intraoperative tools to help surgeons avoid nerve injury. MMG has been widely used in laboratory settings to study things such as muscle fatigue, however up until now it has not been applied as an intraoperative tool for locating nerves.

"We felt there was a safer and faster way to intra-operatively monitor the location of nerves and we wanted to test this theory by directly comparing MMG to EMG," says Stephen Bartol, MD, orthopedic spine surgeon at Henry Ford Hospital. "We found MMG to be extremely effective for detecting the presence of nerves during minimally invasive surgical procedures when the nerves could not be directly visualized."

Dr. Bartol presented results from the study this week at the Tenth Annual Scientific Conference of the Canadian Spine Society in Alberta.

According to the National Institutes of Health, in a three-month period, about one-fourth of U.S. adults experience at least one day of back pain. It is one of the most common medical issues affecting Americans.

During minimally invasive spine surgery, a common treatment for chronic back pain, a small electrical signal is sometimes used to stimulate nerves and detect responses so that nerves are not damaged during surgery.

"Because conventional EMG systems monitor for subtle changes in muscle electrical activity, there is the potential for electrical interference. By using an MMG system, we are not worried about electrical interference since the response to electrical stimulation is measured through mechanical sensors instead," says Dr. Bartol.

In an animal model, Dr. Bartol and his colleagues measured the EMG and MMG responses to electrical current.

"We found that the MMG system had a faster response, indicating a higher sensitivity for detection of nerves at a lower threshold," says Dr. Bartol.

In another study, also presented at the conference, Dr. Bartol took a look at how the muscle response to electrical stimulus varies with the distance of the nerve from the source of the stimulus.

"We need to know exactly how far away we are from the nerve. Working with different levels of current, we were able to establish a relationship between the current and distance, allowing the surgeon to determine precisely how far a nerve is from the stimulus probe," says Dr. Bartol.

They found MMG detected the presence of a nerve on average 1.2 seconds earlier than EMG, using approximately half the amount of stimulating current. Since electrical resistance is highly variable, depending on the conducting tissue, EMG monitoring systems may utilize currents as high as 200 mA. The MMG system in this study has a maximum current output of 6 mA, nearly 35 times less than comparable EMG systems.

"We found mechanomyography to be a more sensitive indicator for locating nerves," says Dr. Bartol. "We can, without looking, know within a millimeter or two where we are in relation to the nerve. By utilizing a system that requires less electrical current, we may be able to further decrease the risk of injury to our patients."

Dr. Bartol explains that further investigation is needed in human trials.

Industry funding for both studies was received from Innovative Surgical Solutions, LLC, based in Royal Oak, MI.

Maria Seyrig | EurekAlert!
Further information:
http://www.hfhs.org

More articles from Studies and Analyses:

nachricht WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf

nachricht First form of therapy for childhood dementia CLN2 developed
25.04.2018 | Universitätsklinikum Hamburg-Eppendorf

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

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

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>