Solution pumping system including disposable pump cassette
First Claim
1. A pump cassette for use with an associated pump driver having a reciprocable pump plunger and a plurality of valve actuators, said pump cassette comprising:
- a cassette body including a plate-like front body member, and a juxtaposed, plate-like rear body member; and
elastomeric diaphragm means positioned between said front and rear body members, said cassette body and said diaphragm means together providing said pump cassette with a plurality of liquid inlets including at least one downstream inlet at least one liquid outlet, a liquid flow path for joining said liquid inlets and outlet in fluid communication, and pump means operably driven by the pump plunger of said associated pump driver for pumping liquid from a selected one of said liquid inlets to said liquid outlet via said flow path,said front and rear body members being joined to each other at marginal joint means extending along at least a portion of confronting marginal edges of said front and rear body members,said front and rear body members being further joined together inwardly of said marginal joint means at diaphragm joint means, said diaphragm joint means extending completely about the periphery of said diaphragm means for enhancing sealing of said liquid flow path.
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Accused Products
Abstract
A solution pumping system including a disposable pump cassette is disclosed, with the system configured for efficient and accurate preparation of parenteral admisture solutions. The system includes a pump driver having a reciprocable pump plunger and a plurality of associated valve actuators. The disposable pump cassette of the system is configured for removable positioning in operative association with the pump driver, and includes a positive displacement pump configured for operation by the reciprocable pump plunger. The pump cassette further includes a plurality of liquid inlets, and at least one liquid outlet joined in fluid communication with the inlets. By selective operation of the valve actuators of the pump driver, one or more selected source solutions are drawn through the pump inlets by the positive displacement pump, and directed through the pump outlet to an admixture solution container. Preferred features of the present pump cassette facilitate liquid flushing to avoid mixture of incompatible source solutions, and enhance the sealing integrity of the cassette construction.
350 Citations
22 Claims
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1. A pump cassette for use with an associated pump driver having a reciprocable pump plunger and a plurality of valve actuators, said pump cassette comprising:
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a cassette body including a plate-like front body member, and a juxtaposed, plate-like rear body member; and elastomeric diaphragm means positioned between said front and rear body members, said cassette body and said diaphragm means together providing said pump cassette with a plurality of liquid inlets including at least one downstream inlet at least one liquid outlet, a liquid flow path for joining said liquid inlets and outlet in fluid communication, and pump means operably driven by the pump plunger of said associated pump driver for pumping liquid from a selected one of said liquid inlets to said liquid outlet via said flow path, said front and rear body members being joined to each other at marginal joint means extending along at least a portion of confronting marginal edges of said front and rear body members, said front and rear body members being further joined together inwardly of said marginal joint means at diaphragm joint means, said diaphragm joint means extending completely about the periphery of said diaphragm means for enhancing sealing of said liquid flow path. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pump cassette for use with an associated pump driver having a reciprocable pump plunger and a plurality of valve actuators, said pump cassette comprising:
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a rigid cassette body; and elastomeric diaphragm means positioned in said cassette body, said cassette body and said diaphragm means together providing said pump cassette with a plurality of liquid inlets, at least one liquid outlet, a liquid flow path for joining said liquid inlets and outlet in fluid communication, and pump means operably driven by the pump plunger of said associated pump driver for pumping liquid from a selected one of said liquid inlets to said liquid outlet via said flow path, said cassette body and said diaphragm means together providing at least one downstream one of said liquid inlets with liquid flushing means so that liquid flow between upstream and downstream portions of said flow path at said one inlet flushes residual liquid from the region of said one liquid inlet, thereby avoiding mixture of incompatible liquids in said cassette. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A solution pumping system, comprising
a pump driver, said pump driver including a reciprocable pump plunger, and a plurality of valve actuators; - and
a pump cassette removably positionable in operative association with said pump driver, said pump cassette including a cassette body comprising a front body member and a juxtaposed rear body member, and an elastomeric diaphragm positioned between said front and rear body members, said front body member defining together with said diaphragm a plurality of liquid inlets, at least one liquid outlet, a liquid flow path for joining said liquid inlets and outlet in fluid communication, and pump means operably driven by the pump plunger of said associated pump driver for pumping liquid from a selected one of said liquid inlets to said liquid outlet via said flow path, each of said inlets and outlets comprising a liquid passage defined by said front body member and terminating in a valve seat, said rear body member defining a plunger opening at said pump means for operative engagement of said reciprocable pump plunger with said diaphragm means for operating said pump means, said rear body member further defining a plurality of valve actuator openings at respective ones of said liquid inlets and outlets for operative engagement of respective ones of said valve actuators with said diaphragm for selectively urging said diaphragm against said valve seats of said inlets and outlets for selecting controlling liquid flow therethrough, said front body member and said diaphragm together providing a plurality of downstream ones of said liquid inlets with liquid flushing means so that liquid flow between upstream and downstream portions of said flow path at each of said ones of said liquid inlets flushes residual liquid from the region of the liquid inlet, thereby avoiding mixture of incompatible liquids in said cassette, each of said liquid flushing means comprising at least one bypass passage means of said liquid flow path extending adjacent to the valve seal of the respective one of said liquid inlets. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification