Diaphragm with magnet
AssigneeCobe Laboratories, Inc.
InventorJames L. Zook
Life of this patent
Estimating the term…
Abstract
A diaphragm for use in a fluid flow chamber comprising a generally flat flexible sheet that is engageable at its periphery and has a central portion that is reciprocally movable along an axis perpendicular to a plane through the periphery, the flexible sheet having annular corrugations around the center portion, and a magnet secured to the center of the sheet, the magnet having a front and a rear, the corrugations causing the front and rear to maintain their orientation with respect to the axis as the central portion travels along the axis.
Claims19
A diaphragm for use in a fluid flow chamber comprising
- a generally flat flexible sheet that is engageable at its periphery and has a central portion that is reciprocally movable a first distance between forward and backward positions along an axis perpendicular to a plane through said periphery,
- said flexible sheet having annular corrugations around said central portion, and
- a magnet secured to said central portion of said sheet,
- said magnet having a front and a rear spaced from each other along said axis by a distance less than said first distance and adapted to be supported solely by said flexible sheet,
- said corrugations causing said front and rear to maintain their orientation with respect to said axis as said central portion travels along said axis.
A fluid flow chamber comprising
- rigid walls having center portions that are spaced further from each other than peripheral portions, said walls defining a chamber therebetween,
- a generally flat flexible sheet that is sealably engaged between said perpheral portions and has a central portion that is reciprocally movable a first distance between forward and backward positions along an axis perpendicular to a plane through said periphery,
- said flexible sheet having annular corrugations around said central portions, and
- a magnet carried solely by said central portion of said sheet and movable therewith back and forth between said walls completely within said chamber,
- said magnetic having a front and a rear spaced from each other along said axis by a distance less than said first distance,
- said corrugations causing said front and rear to maintain their orientation with respect to said axis as said central portion travels along said axis.
A dialysate supply machine comprising
- a fluid flow chamber with a first inlet for connection to a source of fresh dialysate, a first outlet for connection to a dialyzer, a second inlet for connection to said dialyzer, a second outlet for connection to a drain,
- valves controlling flow into and out of said inlets and outlets,
- a generally flat flexible sheet within said chamber and dividing said chamber into a fresh dialysate region communicating with said first inlet and outlet and a spent dialysate region communicating with said second inlet and outlet, said generally flat flexible sheet having a periphery sealed to said chamber and a central portion that is reciprocally movable along an axis perpendicular to a plane through said periphery,
- said flexible sheet having annular corrugations around said central portion,
- a magnet carried solely by said central portion of said sheet and movable therewith back and forth between said walls completely within said chamber,
- said magnet having a front and a rear spaced from each other along said axis by a distance less than said first distance,
- said corrugations causing said front and rear to maintain their orientation with respect to said axis as said central portion travels along said axis, and
- a magnet position sensor outside of said chamber controlling said valves in response to the position of said magnet.
Dependencies are inferred from the claim text.