Gnagi, Helmut;

Knife for the cryo-ultramicrotomy

The knife comprises a block (1) with a front face (3) in which a diamond blade (9) with a frontal surface (10) which is preferably coplanar with the front face (3), is held. The diamond blade (9) has a back surface (11) forming a cutting edge (12) together with the frontal surface (10). A plastic insert (14), preferably of epoxy resin, adjoins the back surface (11) spaced from the cutting edge (12). The insert (14) has a plane upper surface (15) whose plane intersects the frontal surface (10) at an angle of 80.degree. to 87.degree., preferably about 84.degree.. Thereby sectioning and section pick-up under a stereo microscope are facilitated.

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What I claim is:

1. A knife for the cryo-ultramicrotomy, comprising a block (1) with a front face (3), in which a diamond blade (9) with a plane frontal surface (10) is held, the diamond blade (9) having a back surface (11) forming a cutting edge (12) together with the frontal surface (10), a plastic insert (14) adjoining the back surface (11) spaced from the cutting edge (12), said insert (14) having a plane upper surface (15) the plane of which intersecting the frontal surface (10) under an angle (.alpha.) of 75.degree. to 85.degree..

2. The knife of claim 1, wherein the angle of intersection (.alpha.) is approximately 80.degree..

3. The knife of claim 1, wherein the insert (14) is of an epoxy resin.

4. The knife of claim 1, wherein the insert (14) has suitable triboelectrical properties.

5. The knife of claim 1, wherein the frontal surface (10) is inclined to the front face (3) by about 4.degree..

6. The knife of claim 1, wherein the intersecting angle (.beta.) between the frontal surface (10) and the back surface (11) is 25.degree. to 45.degree., preferably approximately 35.degree..