Cutting – With means to convey work relative to tool station – Cut made parallel to direction of and during work movement
Patent
1996-01-29
1998-04-21
Rachuba, Maurina T.
Cutting
With means to convey work relative to tool station
Cut made parallel to direction of and during work movement
83171, 839155, B26D 718
Patent
active
057407088
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a suction microtome, and more particularly, a suction microtome for histological work and the like.
2. Discussion of Prior Art
It is known that, for certain histological work, use is made of appliances known as "microtomes" which, working either at ambient temperature or in cryostatic enclosures, enable tissues to be sectioned into very fine s1ices, the thickness of cut being variable in practice from 0.5 to 60 microns.
The conventional microtomes generally have a support which is intended to receive the piece of tissue to be sectioned and which is actuated with an alternating movement combined with a micrometric advancing displacement oriented perpendicularly to the plane of the alternating movement. With this object carrier there is associated a knife carrier which is adjustable in orientation with respect to the support and is arranged to permit a blade to be mounted which is suitable for sectioning the piece of tissue integral with the alternating support.
The operations of sectioning are very delicate, and it can happen that the sections which are obtained roll up on themselves, leading to complications in picking them up. Moreover, waste, i.e., imperfect sections, are very frequent, and pollute the working space.
SUMMARY OF THE INVENTION
The present invention is intended more particularly to remedy these disadvantages, and consists in fact of endowing the microtome with a suction system which is integral with the knife carrier and which is arranged for selective control to favor flatness of the sections, by opposing their rolling up on themselves, or to ensure the evacuation of waste sections immediately after their appearance in the region of the cutting blade.
The microtome according to the invention includes: a tissue carrier support for receiving a piece of tissue from which the sections are to be cut and a knife carrier for interchangeably mounting a sectioning blade. The knife carrier has a body having an upper face at which the sectioning blade is mounted. The microtome also includes a mechanism suitable for providing an alternating movement between the tissue carrier support and the knife carrier combined with micrometric advancing movement between the tissue carrier support and the knife carrier perpendicular to the alternating movement. A suction cavity is formed in the upper face of the knife carrier. The suction cavity is connected to a source of vacuum or reduced pressure. A cover is pivotably mounted at the body of the knife carrier. The cover has a u-shaped cross-section, opened downwards, profiled to cover the suction cavity and to partially cover the sectioning blade and to define a narrow free space in a form of a channel extending parallel to the upper face of the body of the knife carrier for guiding a flow of suctioning air exerted on the sections between the cover and the upper face of the body of the knife carrier.
Advantageously, the microtome according to the invention also includes a valve for regulating the flow of suctioning air through the narrow free space, which valve has a closed position and an opened position. When the valve is closed, the narrow free space above the valve collects in a flat state the sections obtained.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention will now be described, taken together with the figures, in which:
The accompanying drawing, given by way of example, permits a better understanding of the invention, the characteristics which it exhibits, and the advantages which it is able to provide:
FIG. 1 is a perspective view showing a microtome set up according to the invention;
FIG. 2 is a transverse section through the knife carrier of the microtome according to FIG. 1;
FIG. 3 is a section, on a greater scale, along the plane shown by III--III in FIG. 2;
FIG. 4 reproduces FIG. 2 in the open position of the flap valve; and
FIG. 5 shows, in perspective, in a separated state, the three elements which constitute the suction system of
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patent: 4184472 (1980-01-01), Benedicto et al.
patent: 4700600 (1987-10-01), Pickett
patent: 4752347 (1988-06-01), Rada
patent: 5255585 (1993-10-01), Gordon
Microm Laborgerate GmbH
Rachuba Maurina T.
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