Disposable cassette for cardioplegia delivery system

• US 5,588,816 A
• Filed: 01/31/1995
• Issued: 12/31/1996
• Est. Priority Date: 05/26/1993
• Status: Expired due to Term

• Current Assignee: QMI Medical, Inc. (Atrion Corporation)
• Original Assignee: Quest Medical Incorporated (Atrion Corporation)
• Inventors: Thompson, Thomas C., Abbott, Martyn
• Primary Examiner(s): Thorpe, Timothy
• Assistant Examiner(s): Korytnyk, Peter G.
• Application Number:
  US08/382,299
• Time in Patent Office: 700 Days
• Field of Search: 417/478, 417/479, 417/474, 417/360, 417/503, 417/533, 128/DIG. 12, 604/131, 604/151, 604/153
• US Class Current: 417/479
• CPC Class Codes: A61M 1/3613 Reperfusion, e.g. of the coronary vessels, e.g. retroperfusion
• CPC Class Codes: A61M 1/362227 the interface providing means for actuating on functional elements of the cassette, e.g. plungers
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/362261 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/362265 Details of valves
• CPC Class Codes: A61M 1/3664 for preparing cardioplegia solutions
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/3355 Controlling downstream pump pressure
• CPC Class Codes: A61M 2205/3606 cooled
• CPC Class Codes: A61M 2205/366 by liquid heat exchangers
• CPC Class Codes: A61M 5/16827 controlling delivery of multiple fluids, e.g. sequencing, mixing or via separate flow-paths infusion of multiple fluids without using a controller A61M5/1407
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: Y10S 128/03 Heart-lung

Abstract

A disposable cassette for a cardioplegia system for delivering cardioplegic solution to the heart during open heart surgery in cooperation with an extracorporeal blood circuit employing a heart/lung machine, includes a conduit diverting a portion of the blood flow from the heart/lung machine to a cardioplegia delivery line. A heat exchanger for controlling fluid temperature is provided in the cardioplegia delivery line. A first pump combines the blood from the conduit with a second fluid and delivers the combined flow into the delivery line leading to the heat exchanger. A control panel is operatively connected for adjusting the ratio of blood and second fluid delivered by the first pump and for adjusting the total volumetric rate of flow from the first pump.

Claims

1. A pump cassette usable with a clinical pump for delivering a plurality of fluids comprising:

(a) a first valved cassette inlet for receiving a first fluid;

(b) a second valved cassette inlet for receiving a second fluid;

(c) a common fluid outlet for conveying a combined flow of said first and second fluids;

(d) a common inlet path communicating with said first and second valved cassette inlets;

(e) separate first and second valved pump flow paths communicating with said common inlet path;

(f) first and second pump chambers communicating with, respectively, said first and second valved pump flow paths, each of said chambers having a deformable wall for varying the chamber volume; and

(g) first and second valved outlet paths communicating with said common fluid outlet.

2. A disposable pump cassette for removable insertion into a clinical pump mechanism for delivering a combined flow of blood from a heart/lung machine and at least one other fluid during open heart surgery, said disposable pump cassette comprising:

a first inlet path for receiving said blood fluid;

a second inlet path for receiving said at least one other fluid;

a first inlet valve site interposed along said first inlet path, activatable for opening or closing said first inlet path;

(d) a second inlet valve site interposed along said second inlet path;

(e) a first pumping chamber;

(f) a common inlet path communicating between said first and second inlet paths and said first pumping chamber for receiving said blood and said at least one other fluid, in combination, and for conducting said combined flow to said first pumping chamber;

(g) an outlet from said first pumping chamber;

(h) a second pumping chamber;

(i) said common inlet path communicating between said first and second inlet paths, and said first pumping chamber and said second pumping chamber;

(j) a first valve site interposed along said common inlet path between said first and second inlet paths and said first pumping chamber, activatable to open or close said common inlet path for controlling flow into and out of said first pumping chamber through said common inlet path; and

(k) a second valve site interposed along said common inlet path between said first and second inlet paths and said second pumping chamber, activatable to open or close said common inlet path for controlling flow into and out of said second pumping chamber through said common inlet path.

3. A disposable pump cassette, as in claim 2, further comprising:

(a) a first valve path outlet communicating with said chamber;

(b) a second valve path outlet communicating with said other pumping chamber;

(c) a common fluid outlet communicating with each of said first and second valve path outlets;

(d) a first valve site interposed in said first valve path outlet, activatable to open or close said valve path outlet; and

(e) a second valve site interposed along said second valve path outlet, activatable to open or close said second valve path outlet.

4. A pump cassette comprising:

(a) first and second inlets;

(b) two pumping chambers;

(c) an outlet from said pumping chambers;

(d) a common flow path communicating between each first and second inlets to said pumping chambers; and

(e) first and second valve contact sites along said common flow path interposed between said first and second inlets and said pumping chambers, activatable between a closed position and an open position.

5. A pump cassette, as in claim 4, wherein said pumping chambers comprises two parallel pumping chambers, both communicating with said outlet, and further comprising:

(a) said common flow path, communicating between said first and second inlets, and both of said two parallel pumping chambers; and

(b) valve means, activatable to connect one of said two parallel pumping chambers with said first and second inlets and alternatively activatable to connect another of said two parallel pumping chambers with said first and second inlets, so that said one of said two parallel pumping chambers can force a quantity of fluid out of said outlet while said another of said parallel pumping chambers takes in another quantity of fluid, thereby smoothing the resulting output flow.

6. A disposable pump cassette for removable insertion into a clinical pump mechanism for delivering a combined flow of blood from a heart/lung machine and at least one other fluid during open heart surgery, said disposable pump cassette comprising:

(a) a first inlet path for receiving said blood fluid;

(b) a second inlet path for receiving said at least one other fluid;

(c) a first inlet valve site interposed along said first inlet path, activatable for opening or closing said first inlet path;

(d) a second inlet valve site interposed along said second inlet path;

(e) a plurality of pumping chambers;

(f) a common inlet path communicating between said first and second inlet paths and each of said plurality of pumping chambers for receiving said blood and said at least one other fluid, in combination, and for conducting said combined flow to each of said pumping chambers;

(g) a plurality of valve sites interposed along said common inlet path selectively activatable to open or close said common inlet path at each of said plurality of valve sites for controlling flow to each of said plurality of pumping chambers through said common inlet path; and

(h) an outlet from said plurality of pumping chambers.