US4909710A — Linear peristaltic pump

Claim 1

Independent Claim 137 words

A linear peristaltic pump for creating a moving zone of occlusion along a resilient tube to pump fluid through the tube which comprises: a casing; a platen for supporting the tube in a substantially linear orientation; a camshaft mounted on said casing, said camshaft having a series of cam lobes each eccentrically mounted on said camshaft to establish a helical series therealong, the penultimate and ultimate cam lobes of said series each being formed with a flat; a plurality of fingers each operatively engaged with one of said respective cam lobes; and means for rotating said camshaft to produce a reciprocal movement of said fingers to sequentially urge said fingers against said tube and control the occlusion created by said fingers engaged with said penultimate and said ultimate cam lobes according to the location of said flat.

Claim 2

Dependent Claim 137 words

A linear peristaltic pump for creating a moving zone of occlusion along a resilient tube to pump fluid through the tube which comprises: a casing; a platen for supporting the tube in a substantially linear orientation; a camshaft mounted on said casing, said camshaft having a series of cam lobes each eccentrically mounted on said camshaft to establish a helical series therealong, the penultimate and ultimate cam lobes of said series each being formed with a flat; a plurality of fingers each operatively engaged with one of said respective cam lobes; and means for rotating said camshaft to produce a reciprocal movement of said fingers to sequentially urge said fingers against said tube and control the occlusion created by said fingers engaged with said penultimate and said ultimate cam lobes according to the location of said flat.

Claim 3

Dependent Claim 30 words

A linear peristaltic pump as recited in claim 1 wherein said menas for rotating said camshaft comprises a motor operatively coupled to said camshaft and fixedly mounted on said casing.

Claim 4

Dependent Claim 35 words

A linear peristaltic pump as recited in claim 2 wherein said casing has formed therein a plurality of internal grooves for receiving said plurality of fingers therein to constrain said fingers in said reciprocal movement.

Claim 5

Dependent Claim 21 words

A linear peristaltic pump as recited in claim 3 wherein said camshaft rotates about an axis substantially parallel to the tube.

Claim 6

Dependent Claim 55 words

A linear peristaltic pump as recited in claim 4 wherein said flats on said penultimate cam lobe and on said ultimate cam lobe are configured to lift said penultimate finger and said ultimate finger from the tube at a rate faster than the rate at which the other said fingers are lifted from the tube.

Claim 7

Dependent Claim 33 words

A linear peristaltic pump as recited in claim 5 wherein said flat of said ultimate cam lobe is formed to shorten the reciprocal movement of said finger in the direction of the tube.

Claim 8

Dependent Claim 35 words

A linear peristaltic pump as recited in claim 5 further comprising an ultimate finger operatively engaged with said ultimate cam lobe, said ultimate finger having a length shorter than each of said plurality of fingers.

Claim 9

Dependent Claim 99 words

A linear peristaltic pump for creating a moving zone of occlusion along a resilient tube for pumping fluid through the tube which comprises: a casing; a platen for supporting said tube in substantially a linear orientation; a plurality of fingers slidably mounted within said casing, said fingers serially aligned along the tube; means for reciprocally moving said fingers to sequentially urge said fingers against the tube; and means for lifting said penultimate finger and said ultimate finger from the tube at a rate faster than the rate at which the other of said fingers are lifted from the tube.

Claim 10

Dependent Claim 99 words

A linear peristaltic pump for creating a moving zone of occlusion along a resilient tube for pumping fluid through the tube which comprises: a casing; a platen for supporting said tube in substantially a linear orientation; a plurality of fingers slidably mounted within said casing, said fingers serially aligned along the tube; means for reciprocally moving said fingers to sequentially urge said fingers against the tube; and means for lifting said penultimate finger and said ultimate finger from the tube at a rate faster than the rate at which the other of said fingers are lifted from the tube.

Claim 11

Dependent Claim 66 words

A linear peristaltic pump as recited in claim 8 wherein said means for reciprocally moving said fingers comprises: a camshaft rotatably mounted on said casing; a plurality of cam lobes eccentrically mounted on said camshaft to establish a helical series therealong for operable engagement with said plurality of fingers; and a motor fixedly mounted to said casing and coupled to said camshaft for rotating said camshaft.

Claim 12

Dependent Claim 21 words

A linear peristaltic pump as recited in claim 9 wherein said camshaft rotates about an axis substantially parallel to the tube.

Claim 13

Dependent Claim 34 words

A linear peristaltic pump as recited in claim 10 wherein said casing has formed therein a plurality of grooves for receiving said plurality of fingers therein to constrain said fingers for linear reciprocal movement.

Claim 14

Dependent Claim 39 words

A linear peristaltic pump as recited in claim 11 wherein said means for lifting said penultimate finger and said ultimate finger from said tube comprises a flat formed on said penultimate cam lobe and on said ultimate cam lobe.

Claim 15

Dependent Claim 22 words

A linear peristaltic pump as recited in claim 12 wherein said flat is integrally formed on the circumference of said cam lobe.

Claim 16

Dependent Claim 30 words

A linear peristaltic pump as recited in claim 13 wherein said flat on said ultimate cam lobe shortens the reciprocal movement of said finger in the direction of the tube.

Claim 17

Dependent Claim 25 words

A linear peristaltic pump as recited in claim 11 wherein said ultimate finger has a length shorter than that of the other plurality of fingers.

Claim 18

Independent Claim 118 words

A method for linearizing fluid flow through a resilient tube in a linear peristaltic pump which pumps I.V. fluids with a series of fingers including a penultimate finger, an ultimate finger, and other fingers comprising the steps of: (A) Sequentially occluding a tube in wavelike fashion with said series of fingers to create a moving zone of occlusion along said tube; (B) Disengaging said penultimate finger from said tube at a rate faster than that of said other fingers; (C) Occluding the tube with said ultimate finger for a shorter period of time than that of said other fingers; and (C) Disengaging said ultimate finger from said tube at a rate faster than that of said other fingers.

Claim 19

Independent Claim 118 words

A method for linearizing fluid flow through a resilient tube in a linear peristaltic pump which pumps I.V. fluids with a series of fingers including a penultimate finger, an ultimate finger, and other fingers comprising the steps of: (A) Sequentially occluding a tube in wavelike fashion with said series of fingers to create a moving zone of occlusion along said tube; (B) Disengaging said penultimate finger from said tube at a rate faster than that of said other fingers; (C) Occluding the tube with said ultimate finger for a shorter period of time than that of said other fingers; and (C) Disengaging said ultimate finger from said tube at a rate faster than that of said other fingers.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-03-19	1993-09-18	1994-03-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-03-19	1997-09-18	1998-03-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-03-19	2001-09-18	2002-03-20	$7700.00	Window Closed / Lapsed

Linear peristaltic pump

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