Infusion pump

Claim 2

An infusion pump for administering fluid from a fluid to a patient comprising: (a) a base member: (b) an electric motor mounted on said base member: (c) a cassette detachably connected to said base member, said cassette having a fluid inlet for connection to said fluid source and a fluid outlet for connection to said patient; and (d) pump means, housed within said cassette and having a reciprocative piston assembly detachably connected to said motor and interacting with a pair of fluid chambers on opposite sides of said piston assembly, for pumping fluid through said outlet to said patient at a predetermined volumetric flow rate proportional, by a constant proportionality, that remains constant throughout a stroke of said piston assembly, to the rate of movement of said said inlet from said fluid source at said predetermined volumetric flow rate.

Claim 3

The pump of claim 1 wherein said electric motor includes means for imparting reciprocative motion in opposing directions to said piston assembly, and said base member includes means defining a cavity for enclosing said cassette and matingly engaging the exterior of said cassette for preventing movement of said cassette in said opposing directions.

Claim 4

An infusion pump for administering fluid from a fluid source to a patient comprising: (a) a base member; (b) an electric motor mounted on said base member; (c) a cassette detachably connected to said base member, said cassette having a fluid inlet for connection to said fluid source and a fluid outlet for connection to said patient; (d) pump means, housed within said cassette and having a reciprocative piston and cylinder assembly detachably connected to said motor, for pumping fluid through said outlet to said patient at a predetermined volumetric flow rate proportional to the rate of movement of said motor while simultaneously drawing fluid through said inlet from said fluid source at said predetermined volumetric flow rate, said reciprocative piston and cylinder assembly including a pair of fluid chambers within said cassette and means associated with said chambers for alternately decreasing the volume of one of said chambers while correspondingly increasing the volume of the other of said chambers; (e) valve control motor means mounted on said base member; and (f) valve means housed within said cassette and detachably connected to said valve control motor means for cooperatively selectively connecting said one of said chambers to said outlet while simultaneously connecting said other of said chambers to said inlet, said valve means comprising two pairs of normally open, deformably closable tubes housed within said cassette, each of said pairs being connected to a respective one of said chambers, the first tube of each pair being connected to said outlet and the second tube of each pair being connected to said inlet, and tube closure means movably mounted on said cassette and detachably connected to said valve control motor means for selectively deformably closing the first tube of one of said pairs of tubes and the second tube of the other of said pairs of tubes simultaneously while allowing the remaining tubes to be open.

Claim 5

An infusion pump for administering fluid from a fluid source to a patient comprising: (a) a base member; (b) an electric motor mounted on said base member; (c) a cassette detachably connected to said base member, said cassette having a fluid inlet for connection to said fluid source and a fluid outlet for connection to said patient; (d) pump means, housed within said cassette and having a reciprocative piston and cylinder assembly detachably connected to said motor, for pumping fluid through said outlet to said patient at a predetermined volumetric flow rate proportional to the rate of movement of said motor while simultaneously drawing fluid through said inlet from said fluid source at said predetermined volumetric flow rate, said reciprocative piston and cylinder assembly including a pair of fluid chambers within said cassette and means associated with said chambers for alternately decreasing the volume of one of said chambers while correspondingly increasing the volume of the other of said chambers; (e) valve control motor means mounted on said base member; and (f) valve means housed within said cassette and detachably connected to said valve control motor means for cooperatively selectively connecting said one of said chambers to said outlet while simultaneously connecting said other of said chambers to said inlet, said valve means comprising two pairs of normally open, deformably closable tubes housed within said cassette, each of said pairs being connected to a respective one of said chambers, the first tube of each pair being connected to said outlet and the second tube of each pair being connected to said inlet, and tube closure means movably mounted on said cassette and detachably connected to said valve control motor means for selectively deformably closing the first tube of one of said pairs of tubes and the second tube of the other of said pairs of tubes simultaneously while allowing the remaining tubes to be open.

Claim 6

A cassette for an infusion pump for administering fluid from a fluid source to a patient, said cassette comprising: (a) means defining a pair of fluid chambers; (b) piston means for alternately decreasing the volume of one of said chambers while correspondingly increasing the volume of the other of said chambers; (c) driving means movably mounted with respect to said cassette and detachably engageable externally of said cassette for causing relative reciprocation between said piston means and said chambers; (d) a fluid inlet and a fluid outlet; (e) fluid valve means for selectively connecting said one of said chambers to said outlet while simultaneously connecting said other of said chambers to said inlet; and (f) single valve control means movably mounted on said cassette and detachably engageable externally of said cassette separately from said driving means for alternating the connections of said chambers with respect to said outlet and inlet, respectively.

Claim 7

A cassette for an infusion pump for administering fluid from a fluid source to a patient, said cassette comprising: (a) means defining a pair of fluid chambers; (b) piston means for alternately decreasing the volume of one of said chambers while correspondingly increasing the volume of the other of said chambers; (c) driving means movably mounted with respect to said cassette and detachably engageable externally of said cassette for causing relative reciprocation between said piston means and said chambers; (d) a fluid inlet and a fluid outlet; (e) fluid valve means for selectively connecting said one of said chambers to said outlet while simultaneously connecting said other of said chambers to said inlet; and (f) single valve control means movably mounted on said cassette and detachably engageable externally of said cassette separately from said driving means for alternating the connections of said chambers with respect to said outlet and inlet, respectively.

Claim 8

The cassette of claim 4 wherein said driving means and said valve control means are mounted for reciprocative movement along substantially parallel linear paths with respect to said cassette.

Claim 9

The cassette of claim 4 wherein said piston means is located between said chambers and said driving means is connected to said piston means for reciprocating said piston means with respect to said chambers.

Claim 10

A cassette for a infusion pump for administering fluid from a fluid source to a patient, said cassette comprising: (a) means defining a pair of fluid chambers; (b) piston means for alternately decreasing the volume of one of said chambers while correspondingly increasing the volume of the other of said chambers; (c) driving means movably mounted with respect to said cassette and detachably engageable externally of said cassette for causing relative reciprocation between said piston means and said chambers; (d) a fluid inlet and a fluid outlet; (e) fluid valve means for selectively connecting said one of said chambers to said outlet while simultaneously connecting said other of said chambers to said inlet, said valve means comprising two pairs of normally open, deformably closable tubes housed within said cassette, each of said pairs being connected to a respective one of said chambers, the first tube of each pair being connected to said outlet and the second tube of each pair being connected to said inlet; (f) valve control means movably mounted with respect to said cassette and detachably engageable externally of said cassette for alternating the connections of said chambers with respect to said outlet and inlet, respectively, said valve control means comprising means having a first position for deformably closing the first tube of one said pairs of tubes and the second tube of the other of said pairs of tubes simultaneously, while allowing the remaining tubes to be open.

Claim 11

A cassette for a infusion pump for administering fluid from a fluid source to a patient, said cassette comprising: (a) means defining a pair of fluid chambers; (b) piston means for alternately decreasing the volume of one of said chambers while correspondingly increasing the volume of the other of said chambers; (c) driving means movably mounted with respect to said cassette and detachably engageable externally of said cassette for causing relative reciprocation between said piston means and said chambers; (d) a fluid inlet and a fluid outlet; (e) fluid valve means for selectively connecting said one of said chambers to said outlet while simultaneously connecting said other of said chambers to said inlet, said valve means comprising two pairs of normally open, deformably closable tubes housed within said cassette, each of said pairs being connected to a respective one of said chambers, the first tube of each pair being connected to said outlet and the second tube of each pair being connected to said inlet; (f) valve control means movably mounted with respect to said cassette and detachably engageable externally of said cassette for alternating the connections of said chambers with respect to said outlet and inlet, respectively, said valve control means comprising means having a first position for deformably closing the first tube of one said pairs of tubes and the second tube of the other of said pairs of tubes simultaneously, while allowing the remaining tubes to be open.

Claim 12

A cassette for an infusion pump for administering fluid from a fluid source to a patient, said cassette comprising: (a) means defining a fluid chamber: (b) piston means for alternately decreasing and increasing the volume of said chamber; (c) driving means movably mounted with respect to said cassette and detachably engageable externally of said cassette for causing relative reciprocation between said piston means and said chamber; (d) a fluid inlet and a fluid outlet; (e) fluid valve means for selectively alternatively connecting said chamber to said outlet or inlet, said fluid valve means comprising a pair of normally open, deformably closable tubes housed within said cassette, the first tube of said pair connecting said chamber to said inlet and the second tube of said pair connecting said chamber to said outlet; and (f) valve control means movably mounted with respect to said cassette and detachably engageable externally of said cassette having a first position for deformably closing said first tube of said pair while allowing said second tube to be open and having a second position for deformably closing said second tube of said pair while allowing said first tube to be open.

Claim 13

A cassette for an infusion pump for administering fluid from a fluid source to a patient, said cassette comprising: (a) means defining a fluid chamber: (b) piston means for alternately decreasing and increasing the volume of said chamber; (c) driving means movably mounted with respect to said cassette and detachably engageable externally of said cassette for causing relative reciprocation between said piston means and said chamber; (d) a fluid inlet and a fluid outlet; (e) fluid valve means for selectively alternatively connecting said chamber to said outlet or inlet, said fluid valve means comprising a pair of normally open, deformably closable tubes housed within said cassette, the first tube of said pair connecting said chamber to said inlet and the second tube of said pair connecting said chamber to said outlet; and (f) valve control means movably mounted with respect to said cassette and detachably engageable externally of said cassette having a first position for deformably closing said first tube of said pair while allowing said second tube to be open and having a second position for deformably closing said second tube of said pair while allowing said first tube to be open.

Claim 16

An infusion pump for administering fluid from a fluid source to a patient comprising: (a) a base member: (b) an electric motor mounted on said base member; (c) a cassette detachably connected to said base member, said cassette having a fluid inlet for connection to said fluid source and a fluid outlet for connection said patient; (d) pump means, housed within said cassette and having a reciprocative piston assembly detachably connected to said motor and interacting with a pair of fluid chambers on opposite sides of said piston assembly, for pumping fluid through said outlet to said patient at a pretermined volumetric flow rate proportional, by a constant proportionality, to the rate of movement of said electric motor while simultaneously drawing fluid through said inlet from said fluid source at said predetermined volumetric flow rate; (e) valve control motor means separate from said electric motor mounted on said base member; and (f) valve means housed within said cassette having a single valve control means movably mounted on said cassette and detachably connected to said valve control motor means for cooperatively selectively connecting one of said chambers to said outlet while simultaneously connecting the other of said chambers to said inlet and for alternating the connections of said chambers with respect to said outlet and inlet, respectively.

Claim 17

An infusion pump for administering fluid from a fluid source to a patient comprising: (a) a base member: (b) an electric motor mounted on said base member; (c) a cassette detachably connected to said base member, said cassette having a fluid inlet for connection to said fluid source and a fluid outlet for connection said patient; (d) pump means, housed within said cassette and having a reciprocative piston assembly detachably connected to said motor and interacting with a pair of fluid chambers on opposite sides of said piston assembly, for pumping fluid through said outlet to said patient at a pretermined volumetric flow rate proportional, by a constant proportionality, to the rate of movement of said electric motor while simultaneously drawing fluid through said inlet from said fluid source at said predetermined volumetric flow rate; (e) valve control motor means separate from said electric motor mounted on said base member; and (f) valve means housed within said cassette having a single valve control means movably mounted on said cassette and detachably connected to said valve control motor means for cooperatively selectively connecting one of said chambers to said outlet while simultaneously connecting the other of said chambers to said inlet and for alternating the connections of said chambers with respect to said outlet and inlet, respectively.