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US 4,538,356 AGranted
Surgical knife with controllably extendable blade and gauge therefor
AssigneeKOI Associates
InventorsWilliam R. Knepshield, David D. Ogletree, Nat Sander
Life of this patent
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AssigneeKOI Associates
InventorsWilliam R. Knepshield, David D. Ogletree, Nat Sander
Estimating the term…
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.
Gauge for measuring the projection of a blade-like flat member from an elongated body associated therewith, said body having an axis along which said flat member projects and a front surface from which said member projects a distance to be measured, said gauge including a flat desk-like gauge indicator and a means for retaining said body in a fixed position with said flat member lying with a flat side thereof projecting over said gauge indicator, said gauge indicator having a cylindrical side surface, said front surface of said body abutting said side surface of said disk indicator when said body is retained in said fixed position, said gauge indicator further comprising a circular disk member, rotatable about the center point thereof, at least a portion of the edge of said member defining at least a portion of a first circle, and at least a portion of a second circle scribed on said disk member inward from said first circle and eccentric thereto, said circle portions defining at least a portion of a circumferential common shape of varying radial width, further including markings indicative of the radial distance between said circle portions at a multiplicity of circumferential points thereon.
Dependencies are inferred from the claim text.