Patent ID: 7435218
Filing Date: 2008-10-14
Classification: A61B,G02B

Abstract:
1. An optical instrument, comprising: a shaft having a distal end; an interchangeable head detachably connected to said distal end of said shaft at a coupling point; a first transmission system for transmission of illuminating power in a distal direction, said first transmission system being arranged partially in said shaft and partially in said interchangeable head and passing through said coupling point; a second transmission system for transmission of image information in a proximal direction, said second transmission system being arranged partially in said shaft and partially in said interchangeable head and passing through said coupling point; at least one of said interchangeable head and said coupling point being designed in such a way that upon loosening of said interchangeable head image information of perceptively modified quality is transmitted by said second transmission system; wherein said interchangeable head is connected to said distal end of said shaft at said coupling point by means of at least two positioning pins that engage in corresponding bores; wherein there is arranged between said interchangeable head and said distal end of said shaft an elastic element that upon loosening of said interchangeable head distances said interchangeable head from said distal end of said shafts; and wherein said distancing is limited to less than a length of said positioning pins.