Peristaltic pump

Abstract

Certain aspects of the present disclosure provide a surgical cassette configured to engage a first plurality of rollers of a first roller head. The cassette comprises a face coupled to a first substrate, the face being at a first angle with respect to the first roller head's axis of rotation and a wall of first substrate being at a second angle with respect to the axis of rotation, wherein the first angle is different from the second angle. The cassette also comprises a first sheet positioned on the wall's surface, wherein the first sheet and the wall form first one or more pump segments configured to engage the first plurality of rollers in a position where force applied by each one of the first plurality of rollers on the first one or more pump segments has a direction that is not parallel to the first roller head's axis of rotation.

What is claimed is: 
     
         1 . A surgical cassette configured to engage a first plurality of rollers of a first roller head, comprising:
 a face coupled to a first pump substrate, the face being at a first angle with respect to an axis of rotation of the first roller head and a wall of the first pump substrate being at a second angle with respect to the axis of rotation of the first plurality of rollers, wherein the first angle is different from the second angle; and   a first sheet positioned on a surface of the wall, wherein:
 the first sheet and the wall form first one or more pump segments configured to engage the first plurality of rollers in a position where force applied by each one of the first plurality of rollers on the first one or more pump segments has a direction that is not parallel to the axis of rotation of the first roller head. 
   
     
     
         2 . The surgical cassette of  claim 1 , wherein the wall is parallel to the axis of rotation of the first roller head. 
     
     
         3 . The surgical cassette of  claim 1 , wherein:
 the first pump substrate comprises an alignment guide that is configured to be inserted into an opening of the first roller head; and insertion of the alignment guide in the opening of the first roller head causes the first plurality of rollers to radially expand and exert force on the first one or more pump segments.   
     
     
         4 . The surgical cassette of  claim 1 , wherein:
 the face is coupled to a second pump substrate;   the face and a surface of the second pump substrate are parallel with respect to each other;   a second sheet is positioned on the surface of the second pump substrate; and   the second sheet and the surface of the second pump substrate form a second one or more pump segments configured to engage a second plurality of rollers of a second roller head in a position where force applied by each one of the second plurality of rollers on the second one or more pump segments has a direction that is parallel to the axis of rotation of the second roller head.   
     
     
         5 . The surgical cassette of  claim 4 , wherein the second sheet and the first sheet are coupled to each other. 
     
     
         6 . The surgical cassette of  claim 4 , wherein the first roller head is placed in an opening of the second roller head. 
     
     
         7 . The surgical cassette of  claim 4 , wherein the first roller head and the second roller head are the same. 
     
     
         8 . The surgical cassette of  claim 1 , wherein the first pump substrate is configured to be rotated within a base of the surgical cassette. 
     
     
         9 . The surgical cassette of  claim 8 , wherein the first pump substrate comprises one or more notches configured to be engaged by an actuator for rotating the first pump substrate. 
     
     
         10 . The surgical cassette of  claim 8 , wherein:
 the first pump substrate comprises one or more first ports configured to exchange fluids with one or more second ports of the base of the surgical cassette; and   rotating the cup allows the one or more first ports of the first pump substrate to exchange fluids with one or more third ports of the base of the surgical cassette.   
     
     
         11 . The surgical cassette of  claim 8 , wherein the base comprises one or more latches for securing the first pump substrate in the cassette. 
     
     
         12 . A surgical cassette configured to engage a first plurality of rollers of a first roller head and a second plurality of rollers of a second roller head, comprising:
 first one or more pump segments configured to engage the first plurality of rollers; and   second one or more pump segments configured to engage the second plurality of rollers.   
     
     
         13 . The surgical cassette of  claim 12 , wherein the first roller head and the second roller head are arranged coaxially. 
     
     
         14 . The surgical cassette of  claim 12 , wherein:
 the first one or more pump segments are formed by a first sheet positioned on a surface of a wall of a first pump substrate;   the first pump substrate is coupled to a face of the cassette;   the face is at a first angle with respect to an axis of rotation of the first roller head and the wall is at a second angle with respect the axis of rotation of the first roller head;   the first one or more pump segments are configured to engage the first plurality of rollers of the first peristaltic pump motor in a position where force applied by each one of the first plurality of rollers on the first one or more pump segments has a direction that is not parallel to the axis of rotation of the first roller head;   the second one or more pump segments are formed by a second sheet positioned on a surface of a second substrate;   the face of the cassette and of the surface of the second pump substrate are parallel with respect to each other; and   the second one or more pump segments are configured to engage a second plurality of rollers of the second roller head in a position where force applied by each one of the second plurality of rollers on the second one or more pump segments has a direction that is parallel to the axis of rotation of the second roller head.   
     
     
         15 . A surgical system, comprising:
 a first motor configured to rotate a first plurality rollers of a first roller head, wherein the first plurality of rollers are engaged by first one or more pump segments of a surgical cassette; and   a second motor configured to rotate a second plurality of rollers of a second roller head, wherein the second plurality of rollers are engaged by second one or more pump segments of the surgical cassette.   
     
     
         16 . The surgical cassette of  claim 15 , wherein the first motor is located adjacent to the second motor. 
     
     
         17 . The surgical system of  claim 15 , wherein:
 the first plurality of rollers are engaged by the first one or more pump segments of a surgical cassette in a position where force applied by each one of the first plurality of rollers on the first one or more pump segments has a direction that is not parallel to the axis of rotation of the first roller head; and   the second plurality of rollers are engaged by the second one or more pump segments of the surgical cassette in a position where force applied by each one of the second plurality of rollers on the second one or more pump segments has a direction that is parallel to the axis of rotation of the second roller head.   
     
     
         18 . The surgical system of  claim 15 , wherein:
 the first roller head is placed within an opening of the second roller head.   
     
     
         19 . The surgical system of  claim 15 , wherein:
 the first plurality of rollers are engaged by the first one or more pump segments of a surgical cassette in a position where force applied by each one of the first plurality of rollers on the first one or more pump segments has a direction that is parallel to the axis of rotation of the first roller head; and   the second plurality of rollers are engaged by the second one or more pump segments of the surgical cassette in a position where force applied by each one of the second plurality of rollers on the second one or more pump segments has a direction that is parallel to the axis of rotation of the second roller head.   
     
     
         20 . The surgical system of  claim 15 , wherein the first one or more pump segments and the second one or more pump segments are connected to different fluidic inlets and outlets.