|Publication number||US3792978 A|
|Publication date||Feb 19, 1974|
|Filing date||May 30, 1972|
|Priority date||May 30, 1972|
|Also published as||CA1023631A, CA1023631A1, DE2327200A1, DE2327200B2, DE2327200C3|
|Publication number||US 3792978 A, US 3792978A, US-A-3792978, US3792978 A, US3792978A|
|Original Assignee||Sci Med Life Syst Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (11), Classifications (10), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent [1 1' Freedman ENVELOPE ASSEMBLY FOR SPOOL TYPE I OXYGENATOR  Inventor: Frank B. Freedman, St. Louis, Mo.
 Assignee: Sci-Med Life Systems, Inc.,
: Minneapolis, Minn. 22 Filed: May 30, 1972  Appl. No.: 257,537
 U.S. Cl 23/2585, 128/DIG. 3, 210/321, 210/494  Int. Cl A6lm l/03  Field of Search 23/2585; 210/321, 494; l28/DIG. 3
 References Cited UNITED STATES PATENTS 3,489,647 1/1970 Kolobow 23/2585 X [451 Feb. 19, 1974 3,508,662 4/1970 Miller 210/494 X 3,567,028 3/1971 Nose 23/2585 X 3,729,377 4/1973 Leonard 23/2585 X 3,738,813 6/1973 Esmond 23/2585 3,741,395 6/1973 Zimmerman 1. 210/321 Primary ExaminerBarry S. Richman Attorney, Agent, or Firm-Walter N. Kim, Jr.
 ABSTRACT The invention relates to an envelope assembly for a spool wound artificial lung. The envelope assembly is characterized by having unobtrusive tube attachments which allow the envelope to be wound smoothly and evenly about the spool of the oxygenator.
2 Claims, 3 Drawing Figures ENVELOPE ASSEMBLY FOR SPOOL TYPE OXYGENATOR The invention relates to a new and improved envelope assembly for a spool wound artificial lung which may also be referred to as an oxygenator.
A spool wound artificial oxygenator as referred to above is disclosed in US. Pat. No. 3,489,647 to Theodor Kolobow titled, Artificial Organ for Membrane Dialysis of Biological Fluids. The envelope assembly 11 as disclosed in the Kolobow patent is more or less schematic in nature and a practical embodiment thereof would have to be considerably modified to be effective for its intended purpose. The envelope 11 is wound around the spool or core and, as is characteristic of membrane type oxygenators, the principle of gas diffusion through a membrane is utilized, there being an exchange of oxygen and carbon dioxide under conditions similar to those existing in the lungs. Without going unduly into detail at this point, it is essential to obtaining optimum conditions that the envelope be wound smoothly and evenly about the spool to avoid channeling of the blood. Winding in this desirable manner is not possible, however, if the tube attachments are bulky and cumbersome.
An object of the present invention is to provide a new and improved artificial lung or oxygenator envelope assembly having a tube attachment which is unobtrusive so as to not interfere with the capability of the envelope to be smoothly and evenly wound about the oxygenator spool.
Other objects and advantages of the invention will become apparent from the following specification, drawings and appended claims:
FIG. 1 is a fragmentary front elevational view, partly in section, of an envelope assembly for an artificial lung which assembly embodies the invention;
FIG. 2 is a sectional view of the envelope assembly taken on line 22 of FIG. 1; and
FIG. 3 is a perspective view of the envelope assembly shown in FIGS. I and 2.
In the drawing, there is shown a corner section of an envelope assembly 10 which includes an attached tube 22. The tube construction and the manner of its attachment to the envelope is the'same whether it is to function as a gas inlet tube or a gas outlet tube.
The envelope assembly comprises a pair of rectangu- Iarly shaped membrane sheets 14 and 15 made of a gas permeable material such as silicone rubber, Teflon or polypropylene. These sheets have a thickness on the order of 0.005 inch. As the word envelope implies, the fourjoining edges of the sheets 14 and 15 are sealed with a suitable cement to form a seam 18 having a width on the order of A inch.
Within the space bounded by the sealed edges of the envelope formed by the sheets 14 and 15 is sandwiched a spacer screen 20 which may be of any suitable material such as fiberglass, Saran or nylon and has a thickness on the order of 0.030 inch. Spacer screen 20 functions to maintain a desired spacing between the membrane sheets 14 and 15 to provide a gas chamber which resists collapsing when the external pressure on the sheets 14 and 15 is greater than the internal pressure.
It is of importance that screen 20 is spaced from the seam 18 and is definitely not cemented into the seam.
Tubing means are provided for admitting and exhausting gaseous fluids to and from the enclosed space between membrane sheets 14 and 15 which forms an enclosed chamber as stated above. Only one tube 22 is illustrated but it will be understood that any number of similarly constructed and installed tubes may be utilized. Tube 22 is made of silicon rubber and has a stainless steel, coiled spring 24 inserted therein in a known manner, the purpose of the spring being to prevent kinking of the tube and to present a resistance to the collapsing of the tube when the external environmentalpressure exceeds the internal pressure.
The end of tube 22 is force fitted onto a cylindrically shaped, rigid plastic sleeve 26 having an internal diameter which is nominally the same as the external diameter of tube 22. Sleeve 26 has a transversely extending slit 28 for receiving or accommodating the screen 20.
In surrounding relation to the screen 20 and the sleeve 26 is a folded bib member 30. Bib 30 has an opening which is centrally located relative to the center fold 32 thereof and in closely fitting relation to the sleeve 26. Bib 30 is made of a polyester, cellulose acetate or other suitable plastic material and the purpose or function of it is to protect the inside surfaces of the membrane sheets 14 and 15 from any possibly sharp edge on the sleeve 26.
In the manufacture of the envelope assembly the sleeve 26 is forced onto the end of the tube 22 and the sleeve is slipped into the opening 31 of the bib 30. The edge of the screen 20 is inserted into the slit 28 of the sleeve 26 and the two membrane sheets 14 and 15 are then cemented together to form the seam 18 as described above. In this operation the lower end of the tube 22 and the upper end of the plastic sleeve 26 are in the seam proper between the sealed edges of the membrane sheets 14 and 15. The folded edge of the bib 30 is likewise in the seam proper between the sealed edges of the membrane sheets 14 and 15, as illustrated.
1. A gas exchange envelope assembly for a spool type oxygenator comprising a pair of rectangularly shaped fluid permeable membrane sheets, said sheets being cemented together to form a peripherally extending seam and a chamber therebetween, a screen member in said chamber in closely spaced relation to the internal boundary of said seam, a tube having a sleeve attached at one end thereof in surrounding relation thereto, said tube end and a portion of said sleeve being cemented to and between said sheets within the boundaries of said seam, said sleeve having a transversely extending slit in straddling relation to said screen.
2. An envelope assembly according to claim 1 including a folded bib member having folded parts and an opening along the fold line thereof, said bib opening being in surrounding relation to said sleeve and said folded parts being in straddling relation to said screen.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3489647 *||May 6, 1964||Jan 13, 1970||Dow Corning||Artificial organ for membrane dialysis of biological fluids|
|US3508662 *||Jan 21, 1969||Apr 28, 1970||Extracorporeal Med Spec||Disposable,low-prime,spirally wound,artificial kidney|
|US3567028 *||Dec 26, 1968||Mar 2, 1971||Research Corp||Membrane envelope assembly|
|US3729377 *||Mar 12, 1971||Apr 24, 1973||Baxter Laboratories Inc||Envelope oxygenator for blood having inflatable portions and process of using same|
|US3738813 *||Jun 4, 1971||Jun 12, 1973||W Esmond||Mass transfer device and method of making same|
|US3741395 *||Mar 11, 1971||Jun 26, 1973||Vernitron Medical Prod Inc||Disposable human blood dialysis device|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3892533 *||Mar 2, 1973||Jul 1, 1975||Sci Med||Oxygenator gas distribution header|
|US4019988 *||Aug 28, 1975||Apr 26, 1977||Extracorporeal Medical Specialities Inc.||Dialyzer membrane seal and tubing connector|
|US4306018 *||Jun 26, 1980||Dec 15, 1981||The Board Of Regents Of The University Of Nebraska||Method of gas-heat exchange|
|US4370305 *||Jul 18, 1980||Jan 25, 1983||Hoelzle & Chelius Kg||Device for the sterilization of fluid substances|
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|US5957879 *||Jan 24, 1997||Sep 28, 1999||Heartport, Inc.||Methods and devices for maintaining cardiopulmonary bypass and arresting a patient's heart|
|US6443922||Sep 23, 1999||Sep 3, 2002||Heartport, Inc.||Methods and devices for maintaining cardiopulmonary bypass and arresting a patient's heart|
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|US20020176797 *||Jul 11, 2002||Nov 28, 2002||Roberts Craig P.||Methods and devices for maintaining cardiopulmonary bypass and arresting a patient's heart|
|U.S. Classification||422/48, 210/321.74, 128/DIG.300|
|International Classification||A61M1/24, A61M1/22, A61H31/00|
|Cooperative Classification||B01D2313/10, B01D63/103, Y10S128/03|
|Jun 18, 1991||AS||Assignment|
Owner name: AVECOR INC. A MN CORPORATION, MINNESOTA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCIMED LIFE SYSTEMS, INC., A CORPORATION OF MN;REEL/FRAME:005751/0218
Effective date: 19910607
|Jun 18, 1991||AS02||Assignment of assignor's interest|
Owner name: AVECOR INC. A MN CORPORATION 13010 COUNTY ROAD B P
Owner name: SCIMED LIFE SYSTEMS, INC., A CORPORATION OF MN
Effective date: 19910607