Apheresis bowl with improved vibration characteristics
A centrifuge bowl for separating whole blood into blood components includes a rotatable body, and inlet, and a plurality of vibration reduction members. The rotatable body has a body portion and a neck portion. The body portion defines an interior for receiving whole blood, and the body is rotatable to separate the whole blood into a plurality of blood components. The inlet is in fluid communication with the interior of the rotatable body, and is configured to introduce the whole blood into the rotatable body. The plurality of vibration reduction members are spaced about the neck portion, and are configured to reduce vibration of the centrifuge bowl as the bowl is rotated.
1. A centrifuge bowl for separating whole blood into blood components comprising:
a rotatable body having a body portion and a neck portion, the body portion defining an interior for receiving whole blood, the body being rotatable to separate the whole blood into a plurality of blood components, the body portion also having a shoulder portion extending between the body portion and the neck portion, the body portion, the neck portion and the shoulder portion being integral;
an inlet in fluid communication with the interior of the rotatable body, the inlet configured to introduce the whole blood into the rotatable body; and
at least one vibration reduction member located on the shoulder portion and configured to stiffen at least a portion of the rotatable body and reduce vibration of the centrifuge bowl as the bowl is rotated.
2. A centrifuge bowl according to claim 1 wherein the at least one vibration reduction member includes a plurality of rib members.
3. A centrifuge bowl according to claim 2 , wherein the rib members are curved.
4. A centrifuge bowl according to claim 2 , wherein the rib members are straight.
5. A centrifuge bowl according to claim 1 , wherein the at least one vibration reduction member includes a thickened area located on the shoulder portion.
6. A centrifuge bowl according to claim 5 , wherein the thickened area increases in thickness towards an axis of rotation of the bowl.
7. A centrifuge bowl according to claim 6 , wherein the increase in thickness is stepped.
8. A centrifuge bowl according to claim 1 , wherein the rotatable body is frustoconical.
9. A centrifuge bowl according to claim 1 , wherein the at least one vibration reduction member is configured to increase the natural vibration frequency of a first portion of the centrifuge bowl without increasing the natural vibration frequency of a second portion of the centrifuge bowl, thereby reducing the vibration of the centrifuge bowl as the bowl is rotated.
10. A centrifuge bowl according to claim 9 , wherein the first portion of the centrifuge bowl is the neck portion and the second portion is the body portion.
11. A centrifuge bowl according to claim 2 , wherein each of the plurality of rib members extend radially outward from the neck portion.
12. A centrifuge bowl according to claim 2 , wherein the plurality of rib members are equally spaced about the neck portion.
13. A centrifuge bowl according to claim 2 , wherein each of the plurality of rib members extend from the neck portion to the shoulder portion.
14. A centrifuge bowl according to claim 2 , wherein each of the plurality of rib members reduce in height with increasing distance from the axis of rotation.
15. A centrifuge bowl according to claim 2 , wherein each of the plurality of rib members have a longitudinal axis that is perpendicular to and intersects the axis of rotation of the rotatable body.
16. A centrifuge bowl according to claim 7 , wherein the thickened area has a plurality of steps.
17. A centrifuge bowl according to claim 1 further comprising an outlet, the outlet in fluid communication with the interior of the bowl and configured to remove one or more of the blood components from the centrifuge bowl.
18. A centrifuge bowl according to claim 1 further comprising a rotary seal attached to the rotatable body, the rotary seal fluidly coupling the inlet to the body portion.
19. A centrifuge bowl according to claim 18 , wherein the rotary seal includes a first ring and a second ring.
20. A centrifuge bowl according to claim 1 further comprising a core, the core being coaxial with the interior and creating a whole blood separation region between an outer wall of the core and an inner wall of the rotatable body.