Abstract: A peristaltic pump has a fixed support, a rotor rotatable about a rotor axis on the support, and a plurality of rollers mounted on the rotor rotatable about respective roller axes angularly equispaced about and radially equispaced from the rotor axis. A stator fixedly mounted on the support is formed with a recess having an arcuate floor directed radially inward at the rotor axis and including a main region of constant radius of curvature centered on the rotor axis and an end region of a radius that increases progressively away from the region of constant radius at a uniform rate and that has an angular dimension generally equal to an angular spacing between adjacent roller axes. The recess has an overall angular dimension equal to substantially less than 180.degree.. A tube lying on and extending along the floor is engageable with the rollers so that the rollers form in the tube a series of transfer chambers.

Abstract: A medical insufflator has a flexible tube having a downstream end provided with a needle and an upstream end, the tube and needle forming an insufflation flow path for a neutral gas into a surgical cavity into which the needle is inserted, a supply of the neutral gas under pressure connected to the upstream end, and a flow-control valve along the flow path at the upstream end.