Optimisation and validation of a co‐manipulated robot for brachytherapy procedure

• Published in: The international journal of medical robotics + computer assisted surgery 2023-02, Vol.19 (1), p.e2465-n/a
• Main Authors: Ben Halima, Aziza, Bert, Julien, Clément, Jean‐François, Visvikis, Dimitris
• Format: Article
• Language: English
• Subjects: Biomechanical Phenomena; Brachytherapy - methods; Computer Science; co‐manipulation; Dosage; Genetic algorithms; Humans; Kinematics; Male; Medical Physics; medical robotics; Needles; Optimization; Original; Parallel degrees of freedom; Physics; Placement; prostate brachytherapy; Prostate cancer; Prostatic Neoplasms - radiotherapy; Prostatic Neoplasms - surgery; Radiation therapy; Robotics; Robotics - methods; Robots; Side effects; Workspace
• ISSN: 1478-5951; 1478-596X
• DOI: 10.1002/rcs.2465

Background Low‐dose rate brachytherapy is the referent treatment for early‐stage prostate cancer and consists in manually inserting radioactive seeds within the organ to destroy tumorous cells. This treatment is inaccurate leading to side effects. Researchers developed robots to improve this technique. Despite ameliorating accuracy, they cannot be clinically used because of size and acceptability. Therefore, a 6‐DOF parallel and co‐manipulated robot is proposed to meet these requirements. Methods To fulfil the application requirements, a compact design was modelled. The robot's optimal dimensions were defined by establishing kinematics and implementing genetic algorithm. The robot's relevance was evaluated by measuring workspace and needle placement errors. Results The robot fits into a cube of 300 × 300 × 300 mm3 and provides a free‐singularity workspace of 55 × 55 × 150 mm3 with a possible end‐effector rotation of 15° and a needle placement error