Abstract: An improved peristaltic pump using a pumptube comprising an inner tube and an outer tube each of rigid fluoroplastic material, preferably polytetrafluoroethylene (PTFE), is provided. The pumping section of the pumptube which contacts the pressure rollers of the peristaltic pump is preformed or shaped into a flattened, oval-like shape which approximately conforms to the pumptube passageway in the peristaltic pump. The pressure rollers contact and compress the flattened side of the pumptube and, thereby, effect the transport or pumping of the fluid. Methods for preparing the pumptubes of this invention are also provided. Corrosive, hot, and/or high pressure fluids can be readily handled using the improved pumptubes and peristaltic pumps provided.

Abstract: An improved peristaltic pump using a pumptube comprising an inner tube and an outer tube each of rigid fluoroplastic material, preferably polytetrafluoroethylene (PTFE), is provided. The pumping section of the pumptube which contacts the pressure rollers of the peristaltic pump is preformed or shaped into a flattened, oval-like shape which approximately conforms to the pumptube passageway in the peristaltic pump. The pressure rollers contact and compress the flattened side of the pumptube and, thereby, effect the transport or pumping of the fluid. Methods for preparing the pumptubes of this invention are also provided. Corrosive, hot, and/or high pressure fluids can be readily handled using the improved pumptubes and peristaltic pumps provided.

Abstract: Device in a microtome in which a knife (1) and a specimen (2) are displaceable with respect to one another in two perpendicular planes, one of which is parallel to the cutting surface and the other is parallel to the knife edge, for obtaining a cutting movement or a feeding movement in the microtome, the device being used for obtaining at least one of these movements, the device consisting of at least one spring link (30) in which the moveable part (5) is suspended whereby the link consists of at least two in said plane located crossed leaf springs (27, 28, 29) and driving means (7, 8) arranged between the moveable part and the casing of the microtome (3) so as to achieve said displacement.