# US 11,305,044 B2 · Heat exchanger tube for a heat exchanger of an oxygenator

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- Number: US 11,305,044 B2
- Document ID: US11305044B2
- Status: Granted
- Kind: B2
- Application number: 16/062,655
- Filed: 2016-12-14
- Published: 2018-12-27
- Granted: 2022-04-19
- Earliest claimed: 2015-12-17
- Assignees: Raumedic AG
- Applicants: Raumedic AG
- Inventors: Andreas Dolla
- Web page: https://patentgrep.com/patent/US11305044B2

## CPC

- A61M 1/1698: {Blood oxygenators with or without heat-exchangers (intracorporal A61M1/1678; manufacturing of membranes therefor B01D67/00; semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi-permeable membranes characterised by their material B01D71/00)}
- A61M 1/3623: {Means for actively controlling temperature of blood}
- B29C 48/022: {characterised by the choice of material}
- B29C 48/09: Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C 48/90: with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C 48/9115: {of hollow articles}
- B29C 48/92: Measuring, controlling or regulating
- F28F 21/062: {the heat-exchange apparatus employing tubular conduits}
- A61M 2205/366: by liquid heat exchangers
- A61M 2207/00: Methods of manufacture, assembly or production
- B29C 48/919: {using a bath, e.g. extruding into an open bath to coagulate or cool the material}
- B29C 2948/92647: Thickness
- B29K 2075/00: Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material
- B29K 2995/0006: Dielectric
- B29K 2995/007: Hardness
- B29K 2995/0097: Thickness
- B29L 2023/007: {Medical tubes other than catheters (catheters B29L2031/7542)}
- F28D 2021/005: {for medical applications}
- F28F 2255/16: extruded
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a heat exchanger tube (1) which is a component of a heat exchanger of an oxygenator. The heat exchanger tube (1) comprises a tube body (2) consisting of thermoplastic polyurethane (PTU). The tube body (2) has a Shore hardness of greater than 60 D. This results in a heat exchanger tube optimised for use in a heat exchanger of an oxygenator.

## Claims

### Claim 1

A heat exchanger tube for a heat exchanger of an oxygenator, comprising
a tube body made of a thermoplastic polyurethane (TPU) that is free of gel particles,
wherein the tube body (2) has a Shore hardness greater than 60 D, and
wherein a wall thickness of the tube body deviates less than 0.02 mm along a length of the tube, and
wherein the wall thickness of the tube body is less than 0.07 mm, and
wherein the heat exchanger tube has a dielectric strength of at least 10 kV.

### Claim 2 (depends on 1)

The heat exchanger tube according to claim 1, wherein the Shore hardness of the tube body (2) is greater than 70 D.

### Claim 3 (depends on 2)

The heat exchanger tube according to claim 2, wherein the Shore hardness of the tube body (2) is between 75 D and 83 D.

### Claim 4 (depends on 1)

The heat exchanger tube according to claim 1, wherein the tube body comprises amorphous material regions.

### Claim 5 (depends on 1)

The heat exchanger tube according to claim 1, wherein the wall thickness of the tube body deviates less than 0.01 mm along the length of the tube.

### Claim 6 (depends on 1)

The heat exchanger tube according to claim 1, wherein the wall thickness is between 0.05 mm and 0.06 mm.