Diaphragm cassette for solution pumping system

• US 5,378,126 A
• Filed: 06/06/1994
• Issued: 01/03/1995
• Est. Priority Date: 12/30/1992
• Status: Expired due to Term

• Current Assignee: Hospira Incorporated (Pfizer Inc.)
• Original Assignee: Abbott Laboratories Incorporated
• Inventors: Abrahamson, Kent D., Ogden, John E.
• Primary Examiner(s): Casaregola, Louis J.
• Assistant Examiner(s): KORYTNYK, PETER G
• Application Number:
  US08/254,446
• Time in Patent Office: 211 Days
• Field of Search: 417/360, 417/413 R, 417/479, 417/480, 604/113, 604/154
• US Class Current: 417/479
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 39/04 having pierceable self-sealing members
• CPC Class Codes: A61M 5/14224 Diaphragm type

Abstract

A solution pumping system including a disposable pump cassette is disclosed, with the system configured for efficient and accurate preparation of parenteral admixture 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.

Claims

1. A pump cassette for use with a related pump driver having a reciprocable pump plunger and a plurality of valve actuators, the pump plunger having a face surface, said pump cassette comprising:

a rigid cassette body having a front body member and a rear body member;

a plurality of liquid inlets and at least one liquid outlet provided in the cassette body;

a liquid flow path for joining said liquid inlets and at least one liquid outlet in fluid communication; and

an elastomeric diaphragm positioned between the front and rear body member in said cassette body, the diaphragm including a diaphragm pumping portion operably associated with the pump plunger of said related pump driver for pumping liquid through the flow path from a selected one of said liquid inlets to said at least one liquid outlet, the diaphragm pumping portion including a reinforced diaphragm portion for contacting the face surface of the plunger and having a surface size equal or greater than the size of the face surface of the associated plunger and an unreinforced diaphragm portion surrounding the reinforced portion so that the unreinforced diaphragm portion is not in contact with the face surface of the plunger, the unreinforced diaphragm portion for stretching and relaxing in response to the reciprocation of the pump plunger.

2. The pump cassette of claim 1 further including:

pinch means for circumferentially securing the diaphragm against radial movement within the cassette;

first sealing means for fluidly isolating the diaphragm within the pumping chamber of the cassette;

a reservoir portion to facilitate radial deformation within the cassette; and

second substantially circumferential sealing means for further isolating the diaphragm within the pumping cassette.

3. An elastomeric diaphragm in a pump cassette for use with an associated pump driver having a reciprocable pump plunger, the pump plunger having a face surface, said elastomeric diaphragm comprising:

a reinforced diaphragm portion for abutting association with the face surface of the plunger, said reinforced portion having a size equal or greater than the size of the face surface of the associated plunger;

an unreinforced diaphragm portion surrounding the reinforced portion that is not in contact with the face surface of the plunger, the unreinforced diaphragm portion for stretching and relaxing in response to the reciprocation of the pump plunger;

pinch means for circumferentially securing the diaphragm against radial movement within the cassette;

first sealing means for fluidly isolating the diaphragm within the pumping chamber of the cassette;

a reservoir portion to facilitate radial deformation within the cassette; and

second substantially circumferential sealing means for further isolating the diaphragm within the pumping cassette.

4. An elastomeric diaphragm in a pump cassette for use with an associated reciprocable pump plunger, the pump plunger having a face surface, said elastomeric diaphragm comprising:

a reinforced diaphragm portion for abutting association with the face surface of the plunger, said reinforced portion having a surface area at least the size of the face surface of the associated plunger; and

an unreinforced diaphragm portion surrounding the reinforced diaphragm portion that is not in contact with the face surface of the plunger, the unreinforced diaphragm portion for stretching and relaxing in response to the reciprocation of the pump plunger.

5. The elastomeric diaphragm of claim 4 further comprising:

pinch means for circumferentially securing the diaphragm against radial movement within the cassette;

first sealing means for fluidly isolating the diaphragm within the pumping chamber of the cassette;

a reservoir portion to facilitate radial deformation within the cassette; and

second substantially circumferential sealing means for further isolating the diaphragm within the pumping cassette.

6. The diaphragm of claim 4 for use in a rigid cassette body wherein the associated pump plunger operates with high cycle frequency for extended time periods.

7. The diaphragm of claim 6 wherein the reinforced portion is on the surface of the diaphragm that is opposite the surface in abutment with the plunger.

8. The diaphragm of claim 7 wherein the transition from reinforced to unreinforced includes a tapered transition.