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US 11,525,476 B2Granted
Bearing and medical device
AssigneeTerumo Kabushiki Kaisha
InventorKosuke Nishio
Life of this patent
Estimating the term…
Abstract
Provided are a bearing and a medical device in which a gap is secured between an inner ring and an outer ring, and the gap can be used as a flow path for a fluid or an object. A bearing having a plurality of rolling elements between an inner ring and an outer ring is provided with a raceway surface on which the rolling elements roll on the outer ring and receiving portions for rotatably accommodating the rolling elements at a position of the inner ring facing the raceway surface.
Claims20
A medical device for cutting an object in a biological lumen, the medical device comprising:
- a rotatable drive shaft;
- a cutting portion configured to be positioned in the biological lumen, the cutting portion being on a distal side of the drive shaft and being rotatable together with the drive shaft so that rotation of the drive shaft rotates the cutting portion to cut the object in the biological lumen;
- an outer tube rotatably accommodating the drive shaft;
- an inner ring disposed on a cutting portion side;
- an outer ring disposed on an outer tube side;
- a plurality of rolling elements positioned between the inner ring and the outer ring;
- one of the inner ring or the outer ring including a raceway surface on which the rolling elements roll, the other of the inner ring or the outer ring including a facing surface that faces the raceway surface;
- a plurality of receiving portions individually rotatably accommodating the rolling elements, the plurality of receiving portions being provided on a side of the inner ring or the outer ring facing the raceway surface;
- and
- a radial distance between the raceway surface and the facing surface at locations circumferentially between the receiving portions being greater than the radial distance between the raceway surface and the facing surface at the receiving portions so that axially extending gaps exist between the inner ring and the outer ring, the gaps defining axially extending flow paths that allow a fluid or an object to flow through the axially extending gaps during operation of the medical device.
7 more elements
A bearing having opposite axial ends, the bearing comprising:
- an inner ring that includes an axially extending through hole;
- an outer ring that includes an axially extending through hole;
- a plurality of rolling elements between the inner ring and the outer ring;
- one of the inner ring or the outer ring including a raceway surface in contact with the rolling elements and on which the rolling elements roll, the other of the inner ring or the outer ring including a facing surface that faces the raceway surface;
- a plurality of receiving portions each rotatably accommodating one of the rolling elements, the receiving portions being provided on a side of the inner ring or the outer ring facing the raceway surface;
- a plurality of circumferentially spaced-apart gaps each located between the inner ring and the outer ring and each positioned between circumferentially adjacent ones of the rolling elements, each of the gaps extending axially between the opposite axial ends of the bearing and being open at opposite axial ends of the gap to define a flow path that allows a fluid or an object to flow through the axially extending gaps;
- and
- a radial distance between the raceway surface and the facing surface in the axially extending gaps being greater than the radial distance between the raceway surface and the facing surface at the receiving portions.
5 more elements
A bearing having opposite axial ends, the bearing comprising:
- a first ring that includes an axially extending through hole;
- a second ring that includes an axially extending through hole;
- a plurality of spherical rolling elements positioned between the first ring and the second ring;
- the first ring including a plurality of circumferentially spaced-apart projections that project toward the second ring relative to the portions of the first ring adjacent the projections;
- each of the projections including a convex-shaped receiving portion at which is positioned one of the spherical rolling elements;
- the second ring including a raceway surface in contact with the rolling elements and on which the rolling elements roll;
- the first ring including a facing surface that faces the raceway surface;
- the first ring and the second ring being relatively rotatable about a rotation axis of the bearing;
- one of the first ring and the second ring being an inner ring of the bearing, and the other of the first ring and the second ring being an outer ring of the bearing;
- and
- a plurality of circumferentially spaced-apart gaps each located between the first ring and the second ring and each positioned between circumferentially adjacent ones of the rolling elements, each of the gaps extending axially between the opposite axial ends of the bearing and being open at opposite axial ends of the gap to define a flow path that allows a fluid or an object to flow through the axially extending gaps;
- and
- a radial distance between the raceway surface and the facing surface in the axially extending gaps being greater than the radial distance between the raceway surface and the facing surface at the receiving portions.
10 more elements
Dependencies are inferred from the claim text.