New sensor could help anesthesiologists place needles for epidurals and other medical procedures
More than 13 million pain-blocking epidural procedures are performed every year in the United States. Although epidurals are generally regarded as safe, there are complications in up to 10 percent of cases, in which the needles are inserted too far or placed in the wrong tissue.
A team of researchers from MIT and Massachusetts General Hospital hopes to improve those numbers with a new sensor that can be embedded into an epidural needle, helping anesthesia doctors guide the needle to the correct location.
Currently, anesthesiologists must guide a four- to six-inch needle through multiple layers of tissue to reach the epidural space surrounding the spinal cord. They know when the needle has reached the right spot based on how the tissue’s resistance changes. However, some patients’ tissues vary from the usual pattern, which can make it more difficult to determine whether the needle is in the right place.
“The needle is placed essentially blindly,” says T. Anthony Anderson, an anesthesiologist at MGH and an assistant professor at Harvard Medical School. “The needle can go too far or into the wrong tissue, which means the patient doesn’t get the positive effect that you want or is injured.”
In most cases, these complications lead to reduced effectiveness of the pain-killing drug, or an excruciating post-procedure headache. In rare cases in which the needle goes too far or into a blood vessel, a stroke or spinal cord injury can occur.
Distinguishing tissues
To improve the accuracy of epidural needle placement, Anderson teamed up with researchers at MIT’s Laser Biomedical Research Center, headed by Peter So, a professor of mechanical engineering and biological engineering.
So and MIT research scientist Jeon Woong Kang designed and tested several types of optical sensors that could be placed at the tip of an epidural needle and determined that the best is one that relies on Raman spectroscopy. This technique, which uses light to measure energy shifts in molecular vibrations, offers detailed information about the chemical composition of tissue. In this case, the researchers measured the concentrations of albumin, actin, collagen, triolein, and phosphatidylcholine to accurately identify different tissue layers.
This sensor, which the researchers described in the journal Anesthesiology, provides immediate feedback telling the anesthesiologist which tissue the needle is in. As an epidural needle is inserted, it passes through five layers — skin, fat, supraspinous ligament, interspinous ligament, and ligamentum flavum — before reaching the epidural space, which is the target. Beyond that space lies the dura mater, a stiff membrane that surrounds the spinal cord and cerebrospinal fluid.
“The sensor is continuously measuring Raman spectroscopy signals, which tells you the chemical composition of the tissue. From the chemical composition you can identify all tissue layers, from skin to spinal cord,” Kang says.
The team found that Raman spectroscopy could distinguish each of the eight tissue layers around the epidural space with 100 percent accuracy. Two other techniques that they tested, fluorescence and reflectance spectroscopy, could distinguish some layers but not all eight.
“Blind procedures”
The researchers have tested the sensor in pig tissue and now plan to do further animal studies before testing it in human patients. They also plan to reduce the diameter of the sensor slightly, from 2 millimeters, which is too large to fit in the most commonly used epidural needles, to 0.5 mm.
Jeanine Wiener-Kronish, chief of anesthesia and critical care at MGH, says this type of sensor could greatly improve safety for epidurals, as well as other procedures involving needles.
“The era of blind procedures is one we need to move away from, because we’re very interested in improving safety and quality,” says Wiener-Kronish, who was not involved in the research. “This sensor could allow us to take a fairly blind procedure and be able to get more information about where the needle is.”
The researchers have started a company, Medisight Corp., to continue developing the technology, which they believe could also be applied to medical procedures, such as cancer biopsies or injecting drugs into the joints, which can be difficult to do accurately. This commercialization effort is supported by MIT entrepreneurship programs, including the MIT Translational Fellows Program, MIT Venture Mentoring Service, and MIT Innovation Initiative. The team also received support from the National Science Foundation in the form of a Small Business Technology Transfer program grant.
Learn more: Needles that hit the right mark
The Latest on: Needle sensor
[google_news title=”” keyword=”needle sensor” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Needle sensor
- 'Weird' statistics of electrons ejected by intense quantum lighton May 8, 2024 at 10:21 am
Home > Press release: 'Weird' statistics of electrons ejected ...
- False-Negative Fine-Needle Aspiration Cytology Results Delay Treatment and Adversely Affect Outcome in Patients with Thyroid Carcinomaon May 4, 2024 at 5:00 pm
Clinicians have become reliant on fine-needle aspiration (FNA) cytology in the diagnosis of thyroid nodules. We encountered several patients who had thyroid cancer at operation despite having had ...
- Tuft & Needle Coupons for May 2024on May 2, 2024 at 10:42 pm
How much does shipping cost from Tuft & Needle? Tuft & Needle offers free delivery on all orders, except for shoppers located in Hawaii and Alaska. If you’d like Tuft & Needle to set up your new ...
- The Needle and Thread Planton April 30, 2024 at 5:00 pm
These spines are frequently so strong as to serve the Indians for nails. A needle and thread is also furnished the natives by the simple process of pounding the leaf so as to soften the pulp ...
- Holden store customer stabbed with used needle after confronting shoplifter, police sayon April 26, 2024 at 5:00 pm
An employee was assaulted and a customer at a Main Road business was stabbed with a used needle trying to stop a man who allegedly tried to leave the store without paying. The man, identified by ...
- Tuft & Needle Original Mattress Review: Where Simple Meets Comforton April 26, 2024 at 9:30 am
This all-foam mattress is accommodating and affordable. If you're looking for a cozy bed without the frills, check it out. McKenzie, a Certified Sleep Science Coach and proclaimed mattress expert ...
- Elekta Disposable Biopsy Needle Recall Identified as Class Ion April 25, 2024 at 5:00 pm
FDA recently announced that the Elekta Instrumental AB recall of its disposable biopsy needle kit for the Leksell Stereotactic System has been identified as Class I. The Leksell Stereotactic System is ...
- Space Needleon April 22, 2024 at 4:59 pm
If there's one thing Seattle is known for (aside from coffee), it's the 605-foot-tall Space Needle. Built for the 1962 World's Fair, the Space Needle has dominated Seattle's skyline ever since ...
- Horror as girl, 4, has dentist's needle removed from her brain after procedure went wrongon April 21, 2024 at 1:00 am
A four-year-old girl has had a dentist’s needle removed from her brain after she went in for a simple procedure. Little Sara went in for a simple procedure on a small cavity on her right jaw.
- Investigation shows how far Idaho’s needle exchange program strayed before police raidon April 19, 2024 at 4:59 pm
Controversy surrounding Idaho’s needle exchange programs began earlier this year after the Boise Police Department served search warrants on the Idaho Harm Reduction Project’s Boise and Caldwell ...
via Bing News