The CIVCO transrectal and transvaginal endocavitary needle guideline includes solutions from leading manufacturers of ultrasound systems and is ideal for procedures such as tissue biopsies, fluid aspiration, catheterization and fiducial markers placement. The manufacturers of ultrasound systems work together with CIVCO to validate the transducers and, in collaboration, the needle guides are designed to confidently match the on-screen software guidelines and fit securely into each transducer.