초록 ▼

Surgical knife with controllably extendable blade, the blade retained by a blade holder extending through an axial opening in the knife body and connected with a member threadedly retained within the knife body for axial adjustment and also connected to an adjustment knob at the rear end of the knif

Surgical knife with controllably extendable blade, the blade retained by a blade holder extending through an axial opening in the knife body and connected with a member threadedly retained within the knife body for axial adjustment and also connected to an adjustment knob at the rear end of the knife. Another feature of the knife is a foot configuration which facilitates precise use and control of the knife. Preferably the invention also comprises the knife, as disclosed, in combination with a gauge for visually inspecting blade projection, the gauge indicator consisting of a pair of eccentric circles or portions thereof, the blade projection being measured by comparison with the radial distance between the two circles.

대표청구항 ▼

Surgical knife with controllably extendable blade comprising: (a) a generally cylindrical body with a front end, a rear end, axially displaced therefrom, and a centrally disposed axial opening along the length thereof; (b) a blade disposed at the front end of said body in a plane which includes the

Surgical knife with controllably extendable blade comprising: (a) a generally cylindrical body with a front end, a rear end, axially displaced therefrom, and a centrally disposed axial opening along the length thereof; (b) a blade disposed at the front end of said body in a plane which includes the axis of said body; (c) a blade holder having said knife blade secured at the front end thereof, said holder extending rearwardly from said front end along the axis of said body to a distal end disposed within said body, said holder being freely movable along said axis, said holder further including, at its distal end, a cam surface perpendicular to said axis; (d) a foot, having a frontal surface fixed with respect to said body, and a central axial opening being aligned and in communication with said central axial opening of said body; (e) means for restraining said holder from angular movement about said axis; (f) means for urging said holder rearwardly along said axis; (g) a generally cylindrical adjustment knob, a section of which overlaps a section of said body and is rotatable thereabout and slidable therealong (h) a cam member having a front cam projection in contact with said distal end cam surface of said blade holder, said cam member extending rearwardly thereof along said axis and being urged rearwardly by said urging means while permitting relative rotational movement between said cam projection and said cam surface; (i) means for fastening said cam member to said knob; (j) holder positioning means threadedly secured within said body for longitudinal adjustment of said holder positioning means relative to said body along said axis by rotational adjustment of said positioning means; and (k) selective means for permitting limited axial movement of said holder, cam member and knob relative to said holder positioning means at either one of two fixed axially spaced positions; (l) means for coupling rotational movement of said knob to cause corresponding rotational movement of said holder positioning means so that when said holder, cam member and knob are at one of said fixed axially spaced positions, relative to said holder positioning means, the longitudinal position of said blade, relative to said body, is adjusted by rotational movement of said knob.