Technical Papers and Presentations

Making a diameter of needle small is effective for reducing the pain of patients. However, thinning a needle leads to easy buckling in the puncturing process, because the aspect ratio of needle becomes high. We propose a method for avoiding buckling of thin needle by setting a guide around it. This guide can limit the lateral displacement of needle, making the stress lower than material fracture stress. The displacement and stress of needle after buckling was simulated using the large deformation and contact models.