the present application describes a an image - guided , vacuum assisted , percutaneous , coring , breast biopsy instrument which may be conveniently mounted to an x - ray machine , and incorporate into it a firing fork that is easy to remove and includes a means of maintaining the firing fork perpendicular to the base when the biopsy probe is fired into the patient . it would further be advantageous to design an image - guided , vacuum assisted , percutaneous , coring , breast biopsy instrument which may be conveniently mounted to an x - ray machine which would incorporate a firing fork with a means to maintain the firing fork perpendicular to the base when the biopsy probe is fired into the patient that is easy to remove without the use of special tools .