Pump chamber and valve assembly
First Claim
1. In a peristaltic infusion pump having a housing defining a pump chamber cassette, the pump chamber cassette including a pump chamber assembly having a lumen, the housing further containing a pump driving mechanism including at least an inlet and an outlet pincher valve, means for maintaining the pump chamber cassette in an operative position relative to the pump driving mechanism and means for actuating the pump driving mechanism pincher valves to constrict the lumen of the pump chamber at spaced points along the pump chamber assembly by compressing the pump chamber assembly against a platen to propel liquid through the pump chamber assembly, an improved pump chamber cassette comprising:
- a pump chamber assembly comprising an elastomeric tube having an inlet valve portion and an outlet valve portion made of a first material and a tubular chamber portion disposed therebetween, the chamber portion being made of a second material, there being a lumen through the inlet and outlet valve portions and the chamber portion, the first material having a durometer less than a durometer of the second material, one of the valve portions and the chamber portion having a football-shaped cross section;
a rigid frame; and
means for attaching the elastomeric tube to the frame, the attaching means maintaining the elastomeric tube between the valve pinchers and the platen with the minor axis of the football-shaped cross-section aligned parallel to the direction of the movement between the valve pinchers and the platen with the cassette received in the operative position within a cassette receptacle.
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Accused Products
Abstract
A medical infusion pump (10) using a pump chamber cassette (86) has a housing (20,22) defining a pump chamber cassette receptacle (84) and a pump driving mechanism (250) for propelling liquid through the pump chamber cassette. A door (50) holds the pump chamber cassette (86) within the cassette receptacle (84) in an operative position relative to the driving mechanism (250). The cassette includes an elastomeric conduit (132), a frame (134) and clips (146,148) for attaching the elastomeric conduit (132) to the frame (134) for holding the elastomeric conduit (132) in a select position relative to the pump driving mechanism (250) of the infusion pump upon placement of the cassette (86) in an operative position relative to the pump driving mechanism (250). An anti-free flow device (136,138) includes the flexible conduit (132) received between an anvil (182) fixedly attached to the frame (134) and a pincher (132) attached to the frame (134), the pincher (138) being movable between a first position biasing the pincher (138) against the anvil (182) to occlude a lumen (150) of the elastomeric conduit (132) and a second position for eliminating the bias of the pincher (138) against the anvil (182) so as to not occlude the lumen (150) of the elastomeric conduit (132). The elastomeric conduit (132) is made of an elongate elastomeric robe having an inlet valve portion (142) and an outlet valve portion (144) made of a furst material and a chamber portion (140) disposed therebetween, the chamber portion being made of a second material. The first material has a durometer of less than a durometer of the second material. The chamber portion (140), inlet valve portion (142) and the outlet valve portion (144) may have a football-shaped cross-section.
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Citations
9 Claims
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1. In a peristaltic infusion pump having a housing defining a pump chamber cassette, the pump chamber cassette including a pump chamber assembly having a lumen, the housing further containing a pump driving mechanism including at least an inlet and an outlet pincher valve, means for maintaining the pump chamber cassette in an operative position relative to the pump driving mechanism and means for actuating the pump driving mechanism pincher valves to constrict the lumen of the pump chamber at spaced points along the pump chamber assembly by compressing the pump chamber assembly against a platen to propel liquid through the pump chamber assembly, an improved pump chamber cassette comprising:
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a pump chamber assembly comprising an elastomeric tube having an inlet valve portion and an outlet valve portion made of a first material and a tubular chamber portion disposed therebetween, the chamber portion being made of a second material, there being a lumen through the inlet and outlet valve portions and the chamber portion, the first material having a durometer less than a durometer of the second material, one of the valve portions and the chamber portion having a football-shaped cross section; a rigid frame; and means for attaching the elastomeric tube to the frame, the attaching means maintaining the elastomeric tube between the valve pinchers and the platen with the minor axis of the football-shaped cross-section aligned parallel to the direction of the movement between the valve pinchers and the platen with the cassette received in the operative position within a cassette receptacle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pump chamber assembly for use with a medical infusion pump, the medical infusion pump having a housing defining a pump chamber receptacle, the housing further containing a pump driving mechanism including an inlet pincher valve, an outlet pincher valve and a plunger intermediate the inlet and outlet pincher valves, means for actuating the pump driving mechanism to propel liquid through the pump chamber assembly, and means for maintaining the pump chamber assembly within the pump chamber receptacle in an operative position relative to the pump driving mechanism, the pump chamber assembly comprising:
an elongate elastomeric tube having a tubular inlet valve portion and a tubular outlet valve portion and a tubular chamber portion disposed therebetween, the inlet and outlet valve portions having a wall thickness greater than the wall thickness of the chamber portion, the inlet valve portion, the outlet valve portion and the chamber portion being spaced so that with the pump chamber in an operative position within the pump chamber receptacle the inlet valve portion is proximate the inlet pincher valve, the chamber portion is proximate the plunger and the outlet valve portion is proximate the outlet pincher valve. - View Dependent Claims (8, 9)
Specification