Heat exchanger and oxygenator
A heat exchanger for a blood circulation circuit comprises a hollow fiber membrane layer having a plurality of hollow fiber membranes, and a fixing portion fixing both end portions of the hollow fiber membranes from outsides of the hollow fiber membranes. The fixing portion mainly contains polyurethane, and each of the hollow fiber membranes has a heat conductive layer containing high density polyethylene, and an adhesion layer provided on an outside of the heat conductive layer, bonded to the fixing portion, and mainly containing a modified polyolefin resin.
1. A heat exchanger for a blood circulation circuit, comprising:
a hollow fiber membrane layer having a plurality of hollow fiber membranes; and
a fixing portion fixing both end portions of the hollow fiber membranes from outside of the hollow fiber membranes;
wherein the fixing portion is comprised of polyurethane; and
wherein each of the hollow fiber membranes has a heat conductive layer containing high density polyethylene, and an adhesion layer provided on an outside of the heat conductive layer, bonded to the fixing portion, and comprising a modified polyolefin resin.
2. The heat exchanger according to claim 1 , each of the hollow fiber membranes further comprising:
a barrier layer provided on the outside of the heat conductive layer and on an inside of the adhesion layer, wherein the barrier layer is comprised of a material which is not permeable with respect to hydrogen peroxide.
3. The heat exchanger according to claim 1 wherein the adhesion layer is comprised of modified polyethylene.
4. The heat exchanger according to claim 1 wherein the barrier layer is comprised of a crystalline resin material.
5. The heat exchanger according to claim 1 wherein the heat conductive layer has a thermal conductivity of 0.3 W/m·K or higher and 0.6 W/m·K or lower.
6. The heat exchanger according to claim 1 wherein the hollow fiber membrane has an outer diameter of 1 mm or less.
7. The heat exchanger according to claim 1 wherein the hollow fiber membrane layer has a shape of a cylindrical body and has the hollow fiber membranes wound around a central axis of the cylindrical body and inclined with respect to the central axis of the cylindrical body.
8. The heat exchanger according to claim 1 wherein the hollow fiber membrane layer has a shape of a cylindrical body, and has warp strings in which the hollow fiber membranes are disposed along a central axis of the cylindrical body and weft strings in which the hollow fiber membranes are disposed in a direction intersecting with the central axis of the cylindrical body, and the warp strings and the weft strings are braided.
9. An oxygenator for a blood circulation circuit, comprising:
a hollow fiber membrane layer having a plurality of hollow fiber membranes; and
a fixing portion fixing both end portions of the hollow fiber membranes from outside of the hollow fiber membranes;
wherein the fixing portion is comprised of polyurethane; and
wherein each of the hollow fiber membranes has a heat conductive layer containing high density polyethylene, and an adhesion layer provided on an outside of the heat conductive layer, bonded to the fixing portion, and comprising a modified polyolefin resin.
10. The oxygenator according to claim 9 , each of the hollow fiber membranes further comprising:
a barrier layer provided on the outside of the heat conductive layer and on an inside of the adhesion layer, wherein the barrier layer is comprised of a material which is not permeable with respect to hydrogen peroxide.
11. The oxygenator according to claim 9 wherein the adhesion layer is comprised of modified polyethylene.
12. The oxygenator according to claim 9 wherein the barrier layer is comprised of a crystalline resin material.
13. The oxygenator according to claim 9 wherein the heat conductive layer has a thermal conductivity of 0.3 W/m·K or higher and 0.6 W/m·K or lower.
14. The oxygenator according to claim 9 wherein the hollow fiber membrane has an outer diameter of 1 mm or less.
15. The oxygenator according to claim 9 wherein the hollow fiber membrane layer has a shape of a cylindrical body and has the hollow fiber membranes wound around a central axis of the cylindrical body and inclined with respect to the central axis of the cylindrical body.
16. The oxygenator according to claim 9 wherein the hollow fiber membrane layer has a shape of a cylindrical body, and has warp strings in which the hollow fiber membranes are disposed along a central axis of the cylindrical body and weft strings in which the hollow fiber membranes are disposed in a direction intersecting with the central axis of the cylindrical body, and the warp strings and the weft strings are braided.