US 5,482,446 A · Ambulatory infusion pump

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). A 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 tube having an inlet valve portion (142) and an outlet valve portion (144) made of a first 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.

Claims20

Dependent claims

A pump chamber cassette for use with a medical infusion pump, the medical infusion pump having a housing defining a pump chamber cassette receptacle, the housing further containing a pump driving mechanism for propelling liquid through the pump chamber cassette, and means for maintaining a pump chamber cassette within the cassette receptacle in an operative position relative the pump driving mechanism, the pump chamber cassette comprising:

an elastomeric conduit;
a frame;
the elastomeric conduit to the frame for holding the elastomeric conduit in a select position relative to the pump driving mechanism of the infusion pump upon placement of the cassette in an operative position relative to the pump driving mechanism;
an anvil fixedly attached to the frame;
a pincher attached to the frame with a space between the pincher and the anvil, the elastomeric conduit being received in the space between the pincher and the anvil;
and
biasing means on the frame movable between a first position biasing the pincher against the anvil to occlude a lumen of the elastomeric conduit and a second position for eliminating the bias of the pincher against the anvil so as to not occlude the lumen of the elastomeric conduit.

4 more elements

A medical infusion pump for intervenous delivery of medical liquids to a patent comprising:

a pump chamber cassette including an elastomeric conduit having a lumen therethrough and anti-free flow means movable between an occluding position for occluding the lumen to prevent liquid flow through the elastomeric conduit and a non-occluding position for not occluding the lumen to allow liquid flow through the elastomeric conduit;
a housing including means for receiving the pump chamber cassette;
confining means on the housing movable between a first position for confining the pump chamber cassette within the receiving means in an operative position and a second position for not confining the pump chamber cassette within the receiving means;
pump driving means within the housing and operatively associated with the receiving means for propelling liquid through the elastomeric conduit when the pump chamber cassette is received within the receiving means in an operative position, the pump driving means propelling liquid through the elastomeric conduit by sequentially occluding select portions of the elastomeric conduit lumen;
and
moving means operatively associated with the anti-free flow means and the confining means for moving the anti-free flow means between the occluding position and the non-occluding position as an incident of the confining means first being moved to the first position and for moving the confining means from the first position after the anti-free flow means is moved to the occluding position.

3 more elements

Dependencies are inferred from the claim text.

Ambulatory infusion pump

Life of this patent

Ambulatory infusion pump

Life of this patent

Abstract

Claims20