Design considerations for a novel MRI compatible manipulator for prostate cryoablation.

Area of Science:

• Medical Robotics
• Oncology
• Medical Imaging

Background:

• Prostate carcinoma is a common cancer in men, with nonsurgical treatments for early stages being crucial.
• Magnetic Resonance Imaging (MRI)-guided cryoablation offers lower morbidity for localized prostate cancer but is time-consuming and lacks accuracy.
• A novel robotic assistant is needed to improve efficiency and accuracy in MRI-guided prostate cancer cryotherapy.

Purpose of the Study:

• To design a novel robotic assistant for MRI-guided prostate cancer cryotherapy.
• To improve the efficiency and accuracy of cryoablation procedures for prostate cancer.

Main Methods:

• Developed a wire-driven manipulator for a semiautonomous prostatic cryoprobe localization procedure.
• Defined gestures based on interventional radiologists' actions for a transperineal approach.
• Integrated the robotic assistant with a workflow for automated needle axis positioning before manual insertion.

Main Results:

• Successfully designed and developed a compact, lightweight wire-driven robotic manipulator (100x100x40 mm, 120 g).
• Demonstrated excellent MRI compatibility of the robotic system.
• Established an associated workflow for robotic-assisted cryoprobe positioning.

Conclusions:

• Proposed a novel robotic assistant for MRI-guided cryoablation in prostate cancer treatment.
• Presented the device design and demonstrated its MRI compatibility.
• Identified future development steps including automatic registration and in vivo testing.