Medical instrument and method for producing a medical instrument
A medical instrument and method for producing a medical instrument. The medical instrument includes at least one instrument arm. A toothing with at least two teeth is formed on a distal end of the instrument arm. Each of the teeth project transversely from the distal end and has two tooth flanks facing away from one another. Each tooth flank has at least one planar first surface region and at least one planar second surface region. The at least one planar first surface region and the at least one planar second surface region are inclined toward one another by a surface region angle. The first and second surface regions are formed by milling, in particular with a CNC machine.
1 . A method for producing a medical instrument, the method comprising the steps of:
forming at least one instrument arm; and
forming a toothing on a distal end of the at least one instrument arm, which at least one instrument arm has a top side that is planar, wherein a distal end region of the at least one instrument arm defines a longitudinal direction,
the toothing having at least two teeth that project transversely from the distal end, wherein each of the at least two teeth have tooth flanks facing away from one another, wherein each tooth flank is configured having at least one first surface region that is planar and at least one second surface region that is planar, wherein the at least one first surface region and the at least one second surface region are inclined toward one another by a surface region angle, and wherein the at least one first surface region and the at least one second surface region are formed by milling with a numerically controlled machine,
wherein the at least one first surface region is made with a first milling tool having a cylindrical milling cutter, which cylindrical milling cutter is moved in the longitudinal direction,
wherein, during milling of the at least one first surface region, a longitudinal axis of the cylindrical milling cutter is oriented both perpendicular to the top side and perpendicular to the longitudinal direction,
wherein the at least one second surface region is made with a second milling tool having a first conical milling cutter, which first conical milling cutter is moved obliquely forward in a distal direction in a milling direction which is inclined relative to the top side by an angle of inclination,
wherein, during milling of the at least one second surface region, a longitudinal axis of the first conical milling cutter is inclined relative to the top side by an angle of inclination and, together with the longitudinal direction, the longitudinal axis of the first conical milling cutter defines a plane extending perpendicularly to the top side.
2 . The method according to claim 1 , wherein the toothing projects from the at least one instrument arm in a direction that is transverse with respect to the longitudinal direction.
3 . The method according to claim 1 , wherein the toothing is configured projecting at least partially beyond the top side.
4 . The method according to claim 3 , wherein the at least one first surface region defines a first top side intersection line with the top side, and wherein the at least one second surface region defines a second top side intersection line with the top side.
5 . The method according to claim 4 , wherein:
a) each tooth flank is configured such that the first top side intersection line and the second top side intersection line enclose a first acute angle,
b) the toothing is configured such that the second top side intersection lines of adjacent teeth define a second acute angle,
c) the toothing is configured in such a way that the at least one first surface region and the at least one second surface region of each tooth flank and the top side come into contact at a point of intersection of the respective first top side intersection line and the respective second top side intersection line, and/or
d) the at least two teeth are configured such that each first top side intersection line extends parallel to the longitudinal direction.
6 . The method according to claim 3 , wherein the at least two teeth are configured such that each tooth flank has a notch in the at least one second surface region and that each notch is delimited by the at least one first surface region and by the top side.
7 . The method according to claim 1 , wherein each tooth is configured having at least one planar third surface region.
8 . The method according to claim 1 , wherein the toothing is configured in such a way that each second surface region defines a respective second surface region plane, that the respective second surface region planes of adjacent teeth define a common surface region intersection line for said adjacent teeth, and wherein each common surface region intersection line encloses an angle of inclination with a longitudinal direction of the at least one instrument arm.