Rotary centrifuge bowl and seal for blood processing
AssigneeHaemonetics Corporation
InventorsEdward W. Kaleskas, Thaddeus G. Minior, Jr., Sepideh H. Nott
Life of this patent
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Abstract
A seal for a blood processing centrifuge bowl which is formed of a dynamic rotary seal and a static seal. The dynamic rotary seal is formed of an upper graphite or carbon non-rotating ring member and a lower two-piece rotatable ring member formed of a ceramic bearing surface bonded by adhesive to a plastic adapter ring. The static seal is comprised of an elastomeric diaphragm formed over the upper ring member and secured thereto by a plastic retaining ring.
Claims12
In a rotary centrifuge bowl having a non-rotatable header coupled by a rotary seal to a bowl body, the improvement comprising:
- a) a dynamic rotary seal having:
- (i) an upper non-rotatable bearing surface ring member;
- and
- (ii) a lower rotatable bearing surface ring member formed of a ceramic, one planar side of which faces said upper ring member;
- and
- (iii) an adapter ring member formed of blood compatible plastic and adhesively bonded to a side of said lower ring member opposite said planar side, said adapter ring being directly connected to a neck of said bowl body about the periphery thereof and including projections integrally formed on a surface of said adapter ring member to which said lower ring member is bonded and wherein the adapter ring is a molded piece and the projections are integrally formed thereon and wherein a side of the lower ring member opposite said planar side is formed of at least three portions:
- (i) a first portion which extends radially from the inner periphery of the lower ring member;
- (ii) a second portion which extends vertically downward toward the interior of the bowl body;
- and
- (iii) a third portion which extends radially outwardly from the second portion to the outer periphery of the lower ring member.
A disposable blood processing set comprised of:
- a) a blood processing receptacle bag;
- b) a rotary centrifuge bowl having a non-rotatable input port and output port;
- c) blood compatible tubing connecting the output port to the bag and for connecting the input port to a source of whole blood and wherein said bowl includes a rotatable bowl body and a dynamic rotary seal coupling said bowl body to said input and output ports, said dynamic rotary seal having:
- (i) an upper non-rotatable bearing surface ring member;
- and
- (ii) a lower rotatable ceramic bearing surface ring member, one planar side of which faces said upper ring member;
- and
- (iii) an adapter ring member formed of blood compatible plastic and adhesively bonded to a side of said lower ring member opposite said planar side, said adapter ring being directly connected to a neck formed around an aperture of said bowl body about the periphery thereof and further including projections integrally formed on a surface of said adapter ring member to which said upper ring member is bonded and wherein the adapter ring is a molded piece and the projections are integrally formed thereon and wherein a side of the lower ring member opposite said planar side is formed of at least three portions;
- (i) a first portion which extends radially from the inner periphery of the lower ring member;
- (ii) a second portion which extends vertically downward toward the interior of the bowl body;
- and
- (iii) a third portion which extends radially outwardly from the second portion to the outer periphery of the lower ring member.
Dependencies are inferred from the claim text.