Mechanical Thrombectomy

Neuroimaging Technique Raises Stroke Treatment Standard

Dr. Leo Wolansky

Dr. Leo Wolansky, chair of the UConn Health Department of Radiology, shows the types of images CT perfusion scanning yields to help determine the best course of action in stroke treatment.


UConn John Dempsey Hospital is among only a few hospitals in the state to offer a new neuroimaging technique to patients who’ve suffered the most common type of stroke, potentially quadrupling the narrow window for intervention to 24 hours from the onset of symptoms.

The cutting-edge technique, which involves new software called RAPID, facilitates computed tomography (CT) perfusion imaging in emergency settings by making radiologic interpretation of perfusion data simpler, a particularly crucial feature when treating emergency stroke patients.

This helps physicians determine which patients are good candidates for a highly specialized neurosurgical and interventional radiological procedure called mechanical thrombectomy. The lifesaving procedure is only available at a few hospitals in the state; UConn Health Chief of Neurosurgery Dr. Ketan Bulsara performed UConn John Dempsey Hospital’s first-ever mechanical thrombectomy in November.

“It enables us to easily check how large an area of the brain is deprived of blood flow,” says Dr. Leo Wolansky, chair of the UConn Health Department of Radiology. “We can distinguish between the part of the brain that’s already dead [cerebral infarction] and the part of the brain that is in danger of dying [ischemic] but can be saved.”

In October, UConn Health rolled out the perfusion imaging program a week after processing its first functional MRI case for surgical guidance. The innovations are part of a system-wide initiative by UConn Health leadership to provide cutting-edge technology and recruit top physicians familiar with its use, such as Wolansky, in order to provide the finest care for neurological conditions.

Historically, when a patient has cerebral infarction, the most common type of stroke, the race is on to administer a clot-dissolving medication known as a tissue plasminogen activator (TPA). Mechanical thrombectomy traditionally has also been an option with a very limited timespan. With the introduction of advanced imaging such as RAPID, patients now can be treated safely for up to 24 hours of their stroke if the CT perfusion scan is favorable.

“We can tell if there is brain that can be saved, even beyond the previously accepted window of time for thrombectomy,” Wolansky says. “This creates the possibility of treating many ‘wake-up’ strokes, people who went to sleep well, but woke up eight hours later with a stroke.”

The results of a major study known as the DAWN trial, released in May 2017, showed good outcomes for stroke patients who were treated with thrombectomy up to 24 hours after the event.

3-D Printed Model Allows Brain Surgeons to Rehearse

by Kim Krieger

Dr. Charan K. Singh, right, threads a catheter through a 3-D printed model of arteries in the brain while speaking with Dr. Clifford Yang, one of the  model's creators, at UConn Health.

Dr. Charan K. Singh, right, threads a catheter through a 3-D printed model of arteries in the brain while speaking with Dr. Clifford Yang, one of the model’s creators, at UConn Health. Peter Morenus


The first time a young surgeon threads a wire through a stroke victim’s chest, up through the neck, and fishes a blood clot out of the brain may be one of the most harrowing moments in their career. Now, a UConn Health radiologist and a medical physicist have made it easier for them to get some practice first. The team made a life-size model of the arteries that wire must pass through, using brain scans and a 3-D printer. They will make the pattern freely available to any doctor who requests it.

Five years ago, the Food and Drug Administration (FDA) approved mechanical thrombectomy — using a wire to pull clots out of the brains of stroke victims. A trap at the end of the wire opens like a little snare that captures the clot, which is then dragged out of the patient.

After a couple months of tweaking, a UConn Health radiologist and a medical physicist found they could print a true-to-life teaching model of the brain’s major arteries for about $14.

A lot can go wrong on that journey. One of the most dangerous complications is also one of the most likely: another clot can be accidentally knocked loose from the walls of the arteries and get stuck in the heart, the lungs, or elsewhere in the brain. Computer simulations of the procedure exist, but they are prohibitively expensive for many medical schools to purchase. Yet interventional radiologists and neurosurgeons need to train extensively before they work on a real person.

UConn Health cardiac radiologist Dr. Clifford Yang and medical physicist intern David Brotman knew they could help young doctors feel more comfortable with the mechanics.


Because of the prohibitive costs of computer simulation programs, often the first time a surgeon threads a wire into a stroke victim’s brain to remove a blood clot is during the doctor’s first surgery. Using brain scans and a 3-D printer, a UConn team made a life-size model of the arteries surgeons must navigate during the procedure so they can practice first. The pattern is available for free to any doctor who requests it.


“What matters is the ability of the doctor to be confident in guiding the wire,” says Brotman. He and Yang found a brain scan of a patient with typical blood vessel structure and used the scan to design a 3-D model of the blood vessels. Finding a good scan was easy: UConn has an immense library of scans from computed tomography (CT) and magnetic resonance imaging (MRI) of patients. The tough part was converting the data into something a 3-D printer could interpret. Brotman and Yang found and modified publicly available software to do that, and after a couple months of tweaking, they found they could print a true-to-life teaching model of the brain’s major arteries for about $14.

Technically called a brain perfusion phantom, the model is surprisingly delicate. Holding it in your hand brings home just how small the arteries are, even in an adult man. The top arch of the aorta in the chest, big enough to slide an adult’s pinky finger through, connects to the carotid in the neck and then on to the Circle of Willis in the brain, which is no thicker than a fat piece of yarn. The circle has six branches. Each branch supplies blood to one-sixth of the brain. It is in these branches that clots are most likely to get stuck and cause serious damage.

“We are using this model to teach students,” says UConn interventional radiologist Dr. Charan Singh. “Obviously, it won’t feel like the human body. But it will improve their knowledge of anatomy and give them basic technique on how to move the catheter.”

What matters is the ability of the doctor to be confident in guiding the wire.

Singh demonstrates how a slight twist can violently flip the catheter, which is dangerous. It could knock off new clots into the bloodstream. The model isn’t perfect — there are several different ways a person’s aorta can be shaped, and the other veins can vary too. But students can get good practice with it, Singh says.

Dr. Ketan Bulsara, UConn’s chief of neurosurgery, also likes the technology. He cautions that individual anatomy varies too much for it to be used as the only training tool to learn mechanical thrombectomy, but says that it could potentially be used to visualize other conditions, such as brain tumors. Surgery for brain tumors has significant lead time, and modeling the tumor in advance could personalize and improve patient care.

“Creating these high-level 3-D models customized for individual patients has the potential to significantly improve outcomes and reduce operative times by enhancing surgical planning,” Bulsara says.