US 9,867,919 B2Granted

Production method for medical instrument and medical instrument

AssigneeTerumo Kabushiki Kaisha

InventorsKazuhiko Takeuchi, Eisuke Sasaki

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Abstract

A production method for a medical instrument includes a plurality of integrated hollow fiber membrane producing a base material forming a cylindrically-shaped body. Each of the hollow fiber membranes sequentially passes through a first point, a second point, a third point, a fourth point, and a fifth point that are set on a core member. In an outward path heading toward the third point from the second point, the hollow fiber membrane reaches the third point from the second point at the shortest distance while being wound in the circumferential direction of the core member. Moreover, in a homeward path heading toward the fifth point from the fourth point, the hollow fiber membrane reaches the fifth point from the fourth point at the shortest distance while being wound in the circumferential direction of the core member in the same direction as in the case of the outward path.

Claims19

Dependent claims

A production method for a medical instrument which includes a hollow fiber membrane layer obtained from a base material, the base material having a plurality of hollow fiber membranes formed in a cylindrical shaped body by integrating the plurality of hollow fiber membranes, the cylindrical shaped body having a central axis, the production method comprising:

producing the base material;
obtaining the hollow fiber membrane layer by cutting each of both ends of the base material,
wherein each of the hollow fiber membranes is sequentially passed through a first point which is set at a first site proximal one end of the cylindrical shaped body, a second point which is set at a second site deviating from the first point by 20° to 175° around the central axis of the cylindrical shaped body, the second point of each said hollow fiber membrane being disposed at substantially the same axial position as the first point, such that the portion of said hollow fiber membrane disposed between the first point and the second point extends in the circumferential direction along the shortest path, a third point which is set at a third site at the other end of the cylindrical shaped body such that the third point is located in a position almost opposite to the first point across the central axis, a fourth point which is set at a fourth site of the other end of the cylindrical body such that the fourth point is located in a position almost opposite to the second point across the central axis, and a fifth point which is set at a fifth site that is in a position almost the same as the first point or set at a site that is closer to the one end than the first point, each of the hollow fiber membranes being wound only once around the central axis of the cylindrical shaped body in a pathway sequentially passing through the points from the first point to the fifth point;
in an outward path heading toward the third point from the second point, the hollow fiber membrane reaches the third point from the second point at the shortest distance while being wound along a circumferential direction of the cylindrical shaped body,
in a homeward path heading toward the fifth point from the fourth point, the hollow fiber membrane reaches the fifth point from the fourth point at the shortest distance while being wound along the circumferential direction of the cylindrical shaped body in the same direction as in the case of the outward path, and
after a first line connecting the first point to the second point and a second line connecting the third point to the fourth point are set respectively, a portion, which is closer to the other end than the first line, of one end of the base material is cut, and a portion, which is closer to one end than the second line, of the other end of the base material is cut.

3 more elements

A medical instrument comprising:

a core member possessing a central axis;
a plurality of integrated hollow fiber membranes forming a hollow fiber membrane layer;
each of the hollow fiber membranes extending helically in a direction orthogonal to the central axis of the core member;
wherein each of the hollow fiber membranes begins at a first end of the core member, extends to an opposite end of the core member, and ends at the first end of the core member while winding only once around the central axis of the core member;
wherein one winding of the hollow fiber membrane passes through a first point which is set at a first site of the first end of the core member, a second point which is set at a second site deviating from the first point by 20° to 175° around the central axis of the core member, the second point of each said hollow fiber membrane being disposed at substantially the same axial position as the first point, such that the portion of said hollow fiber membrane disposed between the first point and the second point extends in the circumferential direction along the shortest path, a third point which is set at a third site at the opposite end of the core member such that the third point is located in a position almost opposite to the first point across the central axis, a fourth point which is set at a fourth site of the opposite end of the cylindrical body such that the fourth point is located in a position almost opposite to the second point across the central axis, and a fifth point which is set at a fifth site that is in a position almost the same as the first point or set at a site that is closer to the first end than the first point, in an outward path heading toward the third point from the second point;
and
wherein the hollow fiber membrane reaches the third point from the second point at the shortest distance while being wound along a circumferential direction of the core member, in a homeward path heading toward the fifth point from the fourth point, the hollow fiber membrane reaches the fifth point from the fourth point at the shortest distance while being wound along the circumferential direction of the core member in the same direction as in the case of the outward path.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/495,179Filed 24 Sep 2014 · continuation
Priority: JP 2012-07013926 Mar 2012
Published: US 2015/0010433 A18 Jan 2015
Granted: 16 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

A61M 1/1698
With membranes: blood oxygenators with or without heat-exchangers
A61M 1/3623
Extra-corporeal blood circuits: means for actively controlling temperature of blood
B01D 63/0231
Manufacturing thereof: using supporting structures, e.g. filaments for weaving mats
B01D 63/0232
Manufacturing thereof: using hollow fibers mats as precursor, e.g. wound or pleated mats