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A source of power rotates a drive shaft upon which a pair of rollers are mounted. The rollers rotate in a recess and collapse an undialysed blood carrying tube against a wall thus causing a pumping action. When used with a single needle dialysis system, an occluding pin assembly intermittently clamp

A source of power rotates a drive shaft upon which a pair of rollers are mounted. The rollers rotate in a recess and collapse an undialysed blood carrying tube against a wall thus causing a pumping action. When used with a single needle dialysis system, an occluding pin assembly intermittently clamps off the dialysed blood carrying tube as said source of power is interrupted in rotation thus permitting the device to be used with a conventional single needle assembly. By rotating a cylindrical member upon the upper end of the drive shaft, the rollers can be retracted from adjacent the wall against which the undialysed blood carrying tube rests thus facilitating the engagement and disengagement of the undialysed blood carrying tube with the device. Inasmuch as the wall thickness of such tubes often varies, between tubing produced by different manufacturers, means are provided to adjust the spatial relationship of the pump rollers with the wall against which the tube is pressed during the pumping action. A hinged lid is provided which, when closed, enables power to flow to the motor. This lid also includes means to retain the tubes in position during the operation of the device. The speed of the pump can be varied within limits and the timing sequence of the pump can also be varied within limits. Means are provided to disable the occluding pin assembly when the device is used with a double needle dialysis system.

대표청구항 ▼

In a dialysis pump for use with a conventional dialysis machine which includes a dialysed blood carrying flexible tube and an undialysed blood carrying flexible tube, a source of power, a shaft driven by said source of power, an upper plate, a dialysed blood carrying tube retaining channel formed in

In a dialysis pump for use with a conventional dialysis machine which includes a dialysed blood carrying flexible tube and an undialysed blood carrying flexible tube, a source of power, a shaft driven by said source of power, an upper plate, a dialysed blood carrying tube retaining channel formed in said upper plate and a curved undialysed blood carrying tube retaining wall also formed in said upper plate, a roller type pump assembly driven by said source of power and adapted to rotate against said undialysed blood carrying tube and collapse same against said wall, said pump including a pair of rollers journalled for rotation upon said drive shaft adjacent said wall to produce a pumping action within said undialysed blood carrying tube and an occluder assembly adapted to intermittently engage said dialysed blood carrying tube within its channel; the improvement comprising means to withdraw said rollers from said wall to facilitate engagement and disengagement of said undialysed blood carrying tube against said wall, said means including a rotor bar rotated by said source of power, means pivotally mounting said rollers adjacent the ends of said rotor bar in trailing relationship thereto, and manually operable means mounted upon the upper end of said drive shaft and cooperating with said rollers to retract same from said wall when rotated in one direction and to extend said rollers towards said wall when rotated in the other direction, said manually operated means including a member journalled for free rotation upon said drive shaft, means mounting said rollers for rotation and extending upwardly therefrom, an arcuately curved cam track channel for each of said last mentioned means, formed within the underside of said member and being slidably engageable by said means extending upwardly from said rollers, said cam track channels having inner and outer ends, rotation of said member in one direction when said pump is in the non-operating mode, moving said rollers to a retracted position relative to said wall and in the closest position to said drive shaft, rotation of said member in the opposite direction, moving said rollers to an extended position whereby said rollers are at the maximum distance from said drive shaft, and movement of said rollers further in said opposite direction to said outer ends of said channels, returning said rollers closer to said drive shaft, thereby detachably locking said rollers in the operating mode.