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Publication numberUS3792978 A
Publication typeGrant
Publication dateFeb 19, 1974
Filing dateMay 30, 1972
Priority dateMay 30, 1972
Also published asCA1023631A, CA1023631A1, DE2327200A1, DE2327200B2, DE2327200C3
Publication numberUS 3792978 A, US 3792978A, US-A-3792978, US3792978 A, US3792978A
InventorsF Freedman
Original AssigneeSci Med Life Syst Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Envelope assembly for spool type oxygenator
US 3792978 A
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.
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Description  (OCR text may contain errors)

United States Patent [1 1' Freedman ENVELOPE ASSEMBLY FOR SPOOL TYPE I OXYGENATOR [75] Inventor: Frank B. Freedman, St. Louis, Mo.

[73] Assignee: Sci-Med Life Systems, Inc.,

: Minneapolis, Minn. 22 Filed: May 30, 1972 [21] Appl. No.: 257,537

[52] U.S. Cl 23/2585, 128/DIG. 3, 210/321, 210/494 [51] Int. Cl A6lm l/03 [58] Field of Search 23/2585; 210/321, 494; l28/DIG. 3

[56] 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.

[57] 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.

I claim:

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.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3489647 *May 6, 1964Jan 13, 1970Dow CorningArtificial organ for membrane dialysis of biological fluids
US3508662 *Jan 21, 1969Apr 28, 1970Extracorporeal Med SpecDisposable,low-prime,spirally wound,artificial kidney
US3567028 *Dec 26, 1968Mar 2, 1971Research CorpMembrane envelope assembly
US3729377 *Mar 12, 1971Apr 24, 1973Baxter Laboratories IncEnvelope oxygenator for blood having inflatable portions and process of using same
US3738813 *Jun 4, 1971Jun 12, 1973W EsmondMass transfer device and method of making same
US3741395 *Mar 11, 1971Jun 26, 1973Vernitron Medical Prod IncDisposable human blood dialysis device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3892533 *Mar 2, 1973Jul 1, 1975Sci MedOxygenator gas distribution header
US4019988 *Aug 28, 1975Apr 26, 1977Extracorporeal Medical Specialities Inc.Dialyzer membrane seal and tubing connector
US4306018 *Jun 26, 1980Dec 15, 1981The Board Of Regents Of The University Of NebraskaMethod of gas-heat exchange
US4370305 *Jul 18, 1980Jan 25, 1983Hoelzle & Chelius KgDevice for the sterilization of fluid substances
US4490331 *Feb 12, 1982Dec 25, 1984Steg Jr Robert FExtracorporeal blood processing system
US4599093 *Aug 2, 1984Jul 8, 1986Steg Jr Robert FExtracorporeal blood processing system
US5786215 *May 8, 1995Jul 28, 1998Baxter International Inc.Method for culturing animal cells
US5957879 *Jan 24, 1997Sep 28, 1999Heartport, Inc.Methods and devices for maintaining cardiopulmonary bypass and arresting a patient's heart
US6443922Sep 23, 1999Sep 3, 2002Heartport, Inc.Methods and devices for maintaining cardiopulmonary bypass and arresting a patient's heart
US6974434Jul 11, 2002Dec 13, 2005Heartport, Inc.Methods and devices for maintaining cardiopulmonary bypass and arresting a patient's heart
US20020176797 *Jul 11, 2002Nov 28, 2002Roberts Craig P.Methods and devices for maintaining cardiopulmonary bypass and arresting a patient's heart
Classifications
U.S. Classification422/48, 210/321.74, 128/DIG.300
International ClassificationA61M1/24, A61M1/22, A61H31/00
Cooperative ClassificationB01D2313/10, B01D63/103, Y10S128/03
European ClassificationB01D63/10B
Legal Events
DateCodeEventDescription
Jun 18, 1991ASAssignment
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, 1991AS02Assignment 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