Patent ID: 8216265

Claim:
A medical instrument for punching out tissue comprising: a shaft, a first cap-shaped tool arranged at a distal end of said shaft, said first cap-shaped tool having a circular cutting edge at a proximal end of said tool and an inner cavity housing said shaft, a second tool having a circular cutting edge at a distal end of said second tool, said first cap-shaped tool and said second tool can be shifted relative to one another along said shaft, said circular cutting edge of said second tool can enter said inner cavity of said first cap-shaped tool, said cutting edges of said tools cooperate in a manner of a punch when said circular cutting edge of said second tool enters said inner cavity of said first cap-shaped tool, and a plate-like element fixedly attached to said second tool and being distally spaced apart from said cutting edge of said second tool at a fixed distance, said plate-like element has an extension in a cross-section plane corresponding to a clear internal cross-section plane of said cavity around said shaft.