Medical instrument

Patent metadata

Field	Value
Publication number	US-9867920-B2
Application number	US-201414495269-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Mar 26, 2012
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

An Oxygenator as a medical instrument includes at least one first hollow fiber membrane layer comprised of a plurality of integrated first hollow fiber membranes, and forms a shape of a cylindrical body as a whole, and at least one second hollow fiber membrane layer disposed at the outer circumferential side of the first hollow fiber membrane layer in a state of being concentric with the first hollow fiber membrane layer, has a plurality of integrated second hollow fiber membranes, and forms a shape of a cylindrical body as a whole. Moreover, each of the first hollow fiber membranes is wound around a central axis, and each of the second hollow fiber membranes is wound around a central axis. The number of times the second hollow fiber membranes are wound is smaller than the number of times the first hollow fiber membranes are wound.

First claim

What is claimed is:

1. A medical instrument comprising:
at least one first hollow fiber membrane layer comprised of a plurality of integrated first hollow fiber membranes, the first hollow fiber membrane layer being configured as a cylindrically-shaped body, and possessing an outer circumferential side and a central axis extending along an axial length of the cylindrically-shaped body of the first hollow fiber membrane;
and at least one second hollow fiber membrane layer disposed at the outer circumferential side of the first hollow fiber membrane layer concentric with the first hollow fiber membrane layer, the second hollow fiber membrane layer being comprised of a plurality of integrated second hollow fiber membranes, the second hollow fiber membrane layer being configured as a cylindrical-shaped body,
wherein each of the first hollow fiber membranes and each of the second hollow fiber membranes is wound around the central axis of the cylindrical body;
wherein each of the first hollow fiber membranes sequentially begins at a starting point set at one site at one end of the cylindrically-shaped body, continues to a midpoint, and ends at an endpoint set at one site in the same position as the starting point or in a position deviating from the starting point around the central axis;
wherein each of the first hollow fiber membranes is wound in a first winding pattern from the starting point to the endpoint, the first winding pattern defined by the first hollow fiber membranes being wound at least once in the circumferential direction around the central axis of the cylindrical body in an outward path from the starting point towards the midpoint, and being wound by the same number of turns in a same direction as in the case of the outward path in a homeward path from the midpoint towards the endpoint;
wherein each of the second hollow fiber membranes sequentially begins at a starting point set at one site at an end of the cylindrically-shaped body, continues to a midpoint, and reaches an endpoint set at one site at the same position as the starting point or in a position deviating from the starting point around the central axis;
wherein each of the second hollow fiber membranes is wound in a second winding pattern from the starting point to the endpoint, the second winding pattern being defined by each of the second hollow fiber membranes being wound by one half a circumference in the circumferential direction around the central axis of the cylindrical body in an outward path from the starting point towards the midpoint, and being wound by a same number of turns in a same direction as in the case of the outward path in a homeward path from the midpoint towards the endpoint; and
whereby the first winding pattern of the first hollow fiber members around the central axis of the cylindrical body is different from the second winding pattern of the second hollow fiber membranes around the central axis of the cylindrical body.

2. The medical instrument according to claim 1 ,
wherein the cylindrically-shaped body of the first hollow fiber membrane layer possesses one end and an other end,
wherein in the first winding pattern each of the first hollow fiber membranes extends along an outward path extending from the one end to the other end and a homeward path extending from the other end to the one end, each of the first hollow fiber membranes extending helically at least once around the central axis in the outward path, and extending helically at least once around the central axis in the homeward path.

3. The medical instrument according to claim 1 ,
wherein the midpoint is set at one site at an opposite end of the cylindrically-shaped body such that the midpoint is in an almost same position as the starting point in the circumferential direction of the cylindrical body, and
wherein in the first winding pattern each of the first hollow fiber membranes is wound at least once in the circumferential direction in the outward path heading for the midpoint from the starting point, and is wound at least once in the circumferential direction of the cylindrical body in the same direction as in the case of the outward path in the homeward path heading for the endpoint from the midpoint.

4. The medical instrument according to claim 2 ,
wherein in each of the first hollow fiber membranes, a series of pathways having the outward path and the homeward path are repeated plural times.

5. The medical instrument according to claim 1 ,
wherein the cylindrically-shaped body of the second hollow fiber membrane layer possesses one end and an other end, wherein in the second winding pattern each of the second hollow fiber membranes extends along the outward path extending from the one end to the other end and extends along the homeward path extending from the other end to the one end, and is wound once around the central axis while extending along the outward path and the homeward path.

6. The medical instrument according to claim 5 ,
wherein in each of the second hollow fiber membranes, a series of pathways having the outward path and the homeward path are repeated plural times.

7. The medical instrument according to claim 1 ,
wherein in the second winding pattern the midpoint is set at one site at an opposite end of the cylindrically-shaped body such that the midpoint is in a position opposite to the starting point across the central axis, and each of the second hollow fiber membranes reaches the midpoint from the starting point at a shortest distance while being wound in the circumferential direction of the cylindrically-shaped body in the outward path heading for the midpoint from the starting point, and each of the second hollow fiber membranes reaches the endpoint from the midpoint at a shortest distance while being extending helically in the circumferential direction of the cylindrical body in the same direction as in the case of the outward path in the homeward path heading for the endpoint from the midpoint.

8. The medical instrument according to claim 1 ,
wherein an inner diameter of the first hollow fiber membranes is the same as an inner diameter of the second hollow fiber membranes.

9. The medical instrument according to claim 1 ,
wherein an outer diameter of the first hollow fiber membranes is the same as an outer diameter of the second hollow fiber membranes.

10. The medical instrument according to claim 1 ,
wherein a gap between the first hollow fiber membranes adjacent to each other is the same as a gap between the second hollow fiber membranes adjacent to each other.

11. The medical instrument according to claim 1 ,
wherein materials constituting the first hollow fiber membranes are the same as materials constituting the second hollow fiber membranes.

12. The medical instrument according to claim 1 ,
wherein a length of the first hollow fiber membrane layer extending along the central axis direction is the same as a length of the second hollow fiber membrane layer extending along the central axis direction.

13. The medical instrument according to claim 1 , comprising:
a plurality of the first hollow fiber membrane layers; and
a plurality of the second hollow fiber membrane layers,
wherein a first laminate is constituted with the plurality of the first hollow fiber membrane layers, and a second laminate is constituted with the plurality of the second hollow fiber membrane layers.

14. The medical instrument according to claim 1 ,
wherein each of the first hollow membrane layer and the second hollow membrane layer has a function of performing at least one of a gas exchange and a heat exchange.

15. The med

Assignees

• Terumo Corp

Inventors

• Takeuchi Kazuhiko
• Sasaki Eisuke

Classifications

• B65H81/00

  Methods, apparatus, or devices for covering or wrapping cores by winding webs, tapes, or filamentary material, not otherwise provided for (forming hollow objects by winding filamentary material on to fusible or soluble cores {B29C53/56} ; wrapping for the purpose of packaging B65B11/00; making wound articles of paper B31C) · CPC title

• B01D63/025

  Bobbin units · CPC title

• F04C2270/041

  Controlled or regulated · CPC title

• A61M1/1623

  Disposition or location of membranes relative to fluids · CPC title

• A61M1/1698 Primary

  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) · CPC title