Pumping system
First Claim
Patent Images
1. A pumping system comprising:
- (a) a disposable cassette comprising;
(i) a body having a sealed top side, an open bottom side, an inlet port disposed on a proximal end of the cassette and an outlet port disposed on a distal end of the cassette;
(ii) a first pumping chamber disposed within the open bottom side between a first inlet valve and a first outlet valve;
(iii) a second pumping chamber disposed within the open bottom side between a second inlet valve and a second outlet valve, wherein the first and second pumping chambers are positioned in parallel with each other; and
(iv) a multi-laminate membrane adhered to and sealing the open bottom side defining fluid paths between the inlet port and the outlet port, wherein the multi-laminate membrane comprises a plurality of layers; and
(b) a pumping mechanism comprising;
(i) a chassis configured for removable attachment to the disposable cassette;
(ii) a motor disposed within a length of the chassis and positioned in parallel to an axis extending between the inlet port and the outlet port of the cassette;
(iii) a camshaft disposed adjacent to and in mechanical communication with the motor, wherein the camshaft comprises a plurality of lobes disposed along a length thereof;
(iv) a first drive arm hingedly attached to the chassis and positioned parallel to the motor, wherein a bottom portion of the finger drive arm is in mechanical communication with the camshaft;
(v) a second drive arm hingedly attached to the chassis and positioned opposing the first drive arm, such that the first and second drive arms are positioned on opposing sides of the axis, wherein a bottom portion of the second drive arm is in mechanical communication with the camshaft, and wherein the first and second drive arms are 180°
out of phase with each other;
(vi) a first array of permanent magnets fixedly attached to a top portion of the first drive arm, and a second array of permanent magnets fixedly attached to a top portion of the second drive arm, wherein the first and second arrays of permanent magnets are configured for magnetic attachment to the multi-laminate membrane; and
(v) a plurality of valve arms hingedly attached to the chassis, wherein a lower portion of each valve arm is in mechanical communication with one of the plurality of lobes on the camshaft and an upper portion of each valve arm is configured to respectively actuate each of the first and second inlet valves and the first and second outlet valves.
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Accused Products
Abstract
Provided is a pumping system that includes a parallel dual chamber pumping mechanism and an attachable disposable cassette. The disposable cassette includes a multi-laminate membrane which facilitates efficient, accurate and uniform delivery of fluids. The multi-laminate membrane is held in intimate contact with the pumping fingers of the pumping mechanism by electrostatic or magnetic attraction, thereby allowing the pump to pull a vacuum without the need for a preloaded elastomeric pumping segment.
159 Citations
21 Claims
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1. A pumping system comprising:
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(a) a disposable cassette comprising; (i) a body having a sealed top side, an open bottom side, an inlet port disposed on a proximal end of the cassette and an outlet port disposed on a distal end of the cassette; (ii) a first pumping chamber disposed within the open bottom side between a first inlet valve and a first outlet valve; (iii) a second pumping chamber disposed within the open bottom side between a second inlet valve and a second outlet valve, wherein the first and second pumping chambers are positioned in parallel with each other; and (iv) a multi-laminate membrane adhered to and sealing the open bottom side defining fluid paths between the inlet port and the outlet port, wherein the multi-laminate membrane comprises a plurality of layers; and (b) a pumping mechanism comprising; (i) a chassis configured for removable attachment to the disposable cassette; (ii) a motor disposed within a length of the chassis and positioned in parallel to an axis extending between the inlet port and the outlet port of the cassette; (iii) a camshaft disposed adjacent to and in mechanical communication with the motor, wherein the camshaft comprises a plurality of lobes disposed along a length thereof; (iv) a first drive arm hingedly attached to the chassis and positioned parallel to the motor, wherein a bottom portion of the finger drive arm is in mechanical communication with the camshaft; (v) a second drive arm hingedly attached to the chassis and positioned opposing the first drive arm, such that the first and second drive arms are positioned on opposing sides of the axis, wherein a bottom portion of the second drive arm is in mechanical communication with the camshaft, and wherein the first and second drive arms are 180°
out of phase with each other;(vi) a first array of permanent magnets fixedly attached to a top portion of the first drive arm, and a second array of permanent magnets fixedly attached to a top portion of the second drive arm, wherein the first and second arrays of permanent magnets are configured for magnetic attachment to the multi-laminate membrane; and (v) a plurality of valve arms hingedly attached to the chassis, wherein a lower portion of each valve arm is in mechanical communication with one of the plurality of lobes on the camshaft and an upper portion of each valve arm is configured to respectively actuate each of the first and second inlet valves and the first and second outlet valves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A pumping mechanism comprising:
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(a) a chassis configured for removable attachment to a disposable cassette having an inlet port on a proximal end and an outlet port on a distal end; (b) a motor disposed within a length of the chassis and positioned in parallel to an axis extending from the inlet port to the outlet port of the cassette; (c) a camshaft disposed adjacent to and in mechanical communication with the motor, the camshaft positioned in parallel to the axis, wherein the camshaft comprises a plurality of lobes disposed along a length thereof; (d) a first drive arm hingedly attached to the chassis and positioned parallel to the motor, wherein a bottom portion of the first drive arm is in mechanical communication with the camshaft; (e) a second drive arm hingedly attached to the chassis and positioned opposing the first drive arm, wherein a bottom portion of the second drive arm is in mechanical communication with the camshaft, and wherein the first and second drive arms are 180°
out of phase with each other;(f) a first array of permanent magnets fixedly attached to a top portion of the first drive arm, and a second array of permanent magnets fixedly attached to a top portion of the second drive arm, wherein the permanent magnets are configured for magnetic attachment to a multi-laminate membrane of the disposable cassette when attached thereto; (g) a plurality of strain gauges disposed on a surface of each of the first and second drive arms in contact with the multi-laminate membrane and configured to monitor fluid pressure within first and second pumping chambers of the disposable cassette when attached thereto; and (h) a plurality of valve arms hingedly attached to the chassis, wherein a lower portion of each valve arm is in mechanical communication with one of the plurality of lobes on the camshaft and an upper portion of each valve arm is configured to respectively actuate each of a first inlet valve and a second inlet valve of the cassette and a first outlet valve and a second outlet valve of the cassette. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification