A method to minimize puncturing force and organ deformation

Percutaneous intervention is essential in various medical diagnostic and therapeutic procedures But precise placement of needles in soft tissue is challenging for several reasons. A major part of the needle bending, target deflection, tissue deformation and movement are directly related to the force exerted by the needle during insertion. Significant tissue/organ deformation and movement are observed during capsule puncturing of inner organs like prostate, liver, etc. or the skin of external organs like breast. The undesired deformation and movement can cause deflection of the needle and the target resulting in clinical complications. Although biological tissue relaxes and partially regains its original position, there are some organs whose rotation and deformation remain unrecovered during surgery and consequently the original pre-operative surgical plan becomes erroneous. In this study, we have assessed the capsule puncture force and deformation during insertion of breast biopsy needle in bovine livers. We observed significant improvement in reducing capsule puncture force, total insertion force and friction force by continuous rotation of the needle.