Douche-enema pump

Claim 1

A peristaltic action pump useful for douche and enema purposes and capable of delivering a uniform flow of liquid, comprising: a flexible tube affixed in a hemicircular shape and having a fluid input port at one end thereof and a fluid exit port at the other end thereof; a rotatable member adjacent said tube and generally parallel to the plane of said hemicircle, said rotatable member being rotatable about an axis in line with the axis of said hemicircle; means coupled with said rotatable member for rotatingly driving it; a pair of levers pivotally mounted intermediate thereof to said member, each at an equal and non-zero distance from the rotational axis of said member, a line from the mounting of one of said pair of levers to the mounting of the other of said pair of levers passing through said rotational axis of said member; a pair of rollers, one of said rollers being pivotally attached to one of the ends of each of said levers, at least one of said pair of rollers including a shaft extending from the pivotal axis thereof and beyond said tube, said rollers extending sufficiently from said one end of said lever to press upon and temporarily deform said flexible tube, a line from the attachment of one of said pair of rollers to the attachment of the other of said pair of rollers passing generally through said rotational axis of said member; a pair of pins, said pins being upraised from said rotatable members sufficiently to stop said levers from rotating about their pivotal mounting beyond said pins, said pins being further removed from the rotational axis of said member then are said levers, said pins being located generally intermediate the pivotal mounting of said levers and the rollers mounted to the one end of each of said levers; spring means between the other ends of said pair of levers biasing said other ends of said pair of levers towards one another, a line from said other end of one of said levers to said other end of the other of said levers passing generally through said rotational axis; a cam fixable in place adjacent said tube on an opposite side of said tube from said rotatable member, said shaft of each of said rollers extending sufficiently so as to ride upon said cam when fixed in place, said cam serving to keep one of said rollers from pressing upon and temporarily deforming said flexible tube during a portion of said rollers rotation about the rotational axis of said member whereby a pulsating flow of fluid can be selected by fixing said cam in place; means for fixing said cam in place adjacent said tube; and means for fixing said cam out of place away from said shaft.