Importance

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Abstract

Peristaltic pump means for pumping dialysate solution through a dialysate solution flow circuit in a hemodialysis system. The pump comprises four rollers mounted on a rotatable base member with a relatively long segment of flow circuit tubing tensionally extended around the pump head so as to be simultaneously engaged and compressed by at least two of the rollers, the rollers being mounted for longitudinal movement of the points of compression along the tubing during rotation of the pump head assembly to advance dialysate solution through the flow circuit. The disclosed pump means provides a substantially uniform dialysate solution flow rate under conditions of varying dialysate solution negative pressure and is particularly suitable for use in a unitary, portable hemodialysis module of a type adapted for coupling with either a single-pass proportioning system or a batch dialysate solution supply. A proportioning system is disclosed for such arrangement which employs a recirculating deaeration means for removal of soluble gases from the water employed for make-up of dialysate solution. The peristaltic dialysate solution pump is mounted in the portable hemodialysis module in a manner which facilitates rapid changeover from single-pass to batch dialysate solution flow, and vice versa.

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First Claim