Tech Briefs

The diagnostic robot is 3D printed.

A biopsy robot made from 3D printed plastic can be used in an MRI scanner. The advantage of plastic is that the robot can carry out a biopsy (removing a piece of tissue) during a breast cancer scan in an MRI, which significantly increases accuracy. The Stormram 4 is a stimulus for the entire diagnostic phase of breast cancer; the accurate needle control, effectively real-time MRI scanning and a single, thin-needle biopsy enable quicker and more accurate diagnoses to be made. The researchers believe medical robotics is sure to become standard procedure in hospitals in the near future.

The 3D printed robot is completely MRI compatible. (Credit: University of Twente/MIRA)

The Stormram 4 is driven by rectilinear and curved air-pressure motors. The robot is controlled from outside the MRI scanner by means of 5-m-long air pipes. The design is smaller than the previous version, enabling it to fit inside the MRI scanner’s narrow tunnel.

Breast cancer is the most common form of cancer among women. By inserting a needle in the patient’s breast and navigating to the abnormal tissue (lesion), it is possible to take a tissue sample. A good diagnosis is made possible through subsequent clinical analysis; a process known as a biopsy.

Accurate navigation of the biopsy needle is of crucial importance in combating breast cancer and other forms of cancer. Through the use of special needles, the tip of which can be very hot (thermal ablation) or very cold (cryoablation), it is possible to destroy tumor cells close to the tip of the needle. This enables the treatment of cancer without the need for invasive surgical procedures.

MRI scanners are the answer when it comes to the extremely accurate detection and visualization of the location of abnormal tissue. Unfortunately, it is not possible to make full use of this accuracy as long as needles are controlled by hand. Robotics offers the solution, but not all robots can be used in combination with MRI scanners. Robots are often made of metal, a material that cannot be used in the strong magnetic fields of MRI scanners. For this reason, the University of Twente, in collaboration with Ziekenhuis Groep Twente (ZGT), has made the robot entirely of plastic.

The development of Stormram 4 was carried out by Vincent Groenhuis, MSc, Dr. Françoise Siepel, and Prof. Stefano Stramigioli from the University of Twente’s Robotics and Mechatronics (RAM) lab. In addition, it involved close collaboration with Dr. Jeroen Veltman, a radiologist at Ziekenhuis Groep Twente (ZGT), to make the design as suitable as possible for clinical practice, and Abe van der Werf from Machnet B.V.

The robot won an award during the Surgical Robotic Challenge at the international Hamlyn Symposium in London, an important event in the field of robotic surgery.

A video describing the technology is available here. For more information, visit here.