Pressure output device for extracorporeal hemodialysis machine

Patent metadata

Field	Value
Publication number	US-9757505-B2
Application number	US-201514810526-A
Country	US
Kind code	B2
Filing date	Jul 28, 2015
Priority date	Sep 26, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A pressure output device (POD) assembly for sensing fluid pressure in a fluid processing system, is provided. This POD assembly includes a shell defining a shell interior, and a movable diaphragm disposed in the shell interior and separating the shell interior into a flow-through chamber and a pressure sensing side. A sensor port is in fluid communication with the pressure sensing side. An inlet port and an outlet port are in fluid communication with the flow-through chamber. The inlet port and the outlet port define an inlet and an outlet, respectively, of a flow-through channel that passes through the flow-through chamber. A boss protrudes from the interior wall of the shell and extends into the flow-through channel to prevent occlusion of flow under different pressure conditions within the flow-through chamber.

First claim

What is claimed is:

1. A pressure output device for sensing fluid pressure in a fluid processing system, the pressure sensing device comprising:
a shell defining a shell interior; and
a movable diaphragm disposed in the shell interior and separating the shell interior into a flow-through chamber defined by a lower portion of the shell and a first side of the diaphragm, and a pressure sensing chamber defined by an upper portion of the shell and a second side of the diaphragm, the second side being opposite the first side, the shell further defining a sensor port in fluid communication with the pressure sensing chamber, an inlet port in fluid communication with the flow-through chamber, and an outlet port in fluid communication with the flow-through chamber,
wherein the inlet port and the outlet port define an inlet and an outlet, respectively, of a fluid flow path through the flow-through chamber, and the flow-through chamber has an interior wall and comprises a boss along the interior wall, which prevents the diaphragm from occluding flow through the fluid flow path.

2. The pressure output device of claim 1 , wherein the inlet port has an axial center, the outlet port has an axial center, the axial center of the inlet port is substantially or completely aligned with the axial center of the outlet port, the boss protrudes from the interior wall and extends into the fluid flow path, and the boss includes at least one feature that intersects with a line that is co-axial with one or both of the axial centers.

3. The pressure output device of claim 1 , wherein the fluid processing system is a hemodialysis machine, the fluid path is a blood path, and the boss comprises a diamond-shaped cross-section configured to minimize the potential for hemolysis due to occlusion of blood flow.

4. The pressure output device of claim 1 , wherein the boss comprises a mid-section, a first end adjacent the inlet port, and a second end adjacent the outlet port, and the boss has a thickness that increases in a direction from the first end toward the mid-section and a thickness that increases in a direction from the second end toward the mid-section.

5. The pressure output devices of claim 4 , wherein the boss has a width that increases in a direction from the first end toward the mid-section and a width that increases in a direction from the second end toward the mid-section.

6. A system comprising the pressure output device of claim 1 , a pressure monitor, and a monitor line that forms a fluid communication between the sensor port and the pressure monitor.

7. A system comprising the pressure output device of claim 1 , a first blood tubing in fluid communication with the inlet port, a second blood tubing in fluid communication with the outlet port, and a blood pump in operative engagement with at least one of the first blood tubing and the second blood tubing.

8. The pressure output device of claim 1 , wherein the shell comprises a shell top and a shell bottom, the movable diaphragm comprises an outer periphery, and the outer periphery is sandwiched between the shell top and the shell bottom.

9. The pressure output device of claim 8 , wherein the outer periphery of the movable diaphragm includes a groove, and at least one of the shell top and the shell bottom includes an outer peripheral shell rim configured to fit into the groove and engage the outer periphery of the movable diaphragm.

10. The pressure output device of claim 9 , wherein the shell top and the shell bottom are bonded together, the movable diaphragm is positioned between the shell top and the shell bottom, and the outer peripheral rim is seated in the groove of the movable diaphragm.

11. The pressure output device of claim 9 , wherein the groove is formed on a first side of the movable diaphragm, the outer periphery of the movable diaphragm comprises a rim along a second side of the movable diaphragm opposite the first side, the shell top comprises the outer peripheral shell rim, and the shell bottom comprises an outer peripheral groove configured to accommodate and engage the rim of the movable diaphragm.

12. The pressure output device of claim 1 , wherein the diaphragm comprises a peripheral hinge and one or more hinge interruptions that form one or more respective discontinuances along the peripheral hinge.

13. The pressure output device of claim 1 , wherein the lower portion of the shell comprises a shell interior wall, the interior wall of the flow-through chamber includes the shell interior wall, and the boss is arranged along the shell interior wall and spaced away from the first side of the diaphragm.

14. A pressure output device for sensing fluid pressure in a fluid processing system, the pressure sensing device comprising:
a shell defining a shell interior; and
a movable diaphragm disposed in the shell interior and separating the shell interior into a flow-through chamber defined by a lower portion of the shell and a first side of the diaphragm, and a pressure sensing chamber defined by an upper portion of the shell and a second side of the diaphragm, the second side being opposite the first side, the shell further defining a sensor port in fluid communication with the pressure sensing chamber, an inlet port in fluid communication with the flow-through chamber, and an outlet port in fluid communication with the flow-through chamber, the inlet port and the outlet port being aligned with one another along a first line,
wherein the inlet port and the outlet port define an inlet and an outlet, respectively, of a fluid flow path through the flow-through chamber, the flow-through chamber comprises an interior shell wall having a mid-section that includes a smooth uninterrupted surface that is continuous from a first point on the interior shell wall at a first intersection with the diaphragm to a second point on the interior shell wall at a second intersection with the diaphragm, the first and second points are arranged along a line that is perpendicular to the first line, the inlet of the fluid flow path merges with the smooth uninterrupted surface of the interior shell wall at a first partial interior shell wall cut-out, the outlet of the fluid flow path merges with the smooth uninterrupted surface of the interior shell wall at a second partial interior shell wall cut-out, the fluid flow path includes the first partial interior shell wall cut-out, the interior shell wall mid-section, and the second partial interior shell wall cut-out, and the first and second interior shell wall cut-outs do not intersect with one another.

15. The pressure output device of claim 14 , wherein the inlet port has an axial center, the outlet port has an axial center, and the axial center of the inlet port is substantially or completely aligned with the axial center of the outlet port.

16. The pressure output device of claim 14 , wherein the fluid processing system is a hemodialysis machine, the fluid flow path is a blood flow path, and the fluid flow path is configured to minimize the potential for hemolysis due to occlusion of blood flow.

17. A system comprising the pressure output device of claim 14 , a pressure monitor, and a monitor line that forms a fluid communication between the sensor port and the pressure monitor.

18. A system comprising the pressure output device of claim 14 , a first blood tubing in fluid communication with the inlet port, a second blood tubing in fluid communication with the outlet port, and a blood pump in operative engagement with at least one of the first blood tubing and the second blood tubing.

1

Assignees

• Fresenius Medical Care Holdings Inc

Inventors

• Lindley Deloy
• Badillo Jose Antonio
• Smith Michael Parry
• Lasher Richard Allen
• Dayton Troy Calvin
• Jensen Lynn E

Classifications

• A61M1/3639 Primary

  Blood pressure control, pressure transducers specially adapted therefor · CPC title

• A61M2205/3331

  Pressure; Flow · CPC title

• A61M2205/12

  with interchangeable cassettes forming partially or totally the fluid circuit · CPC title

• G01L19/0023

  for flowthrough systems having a flexible pressure transmitting element · CPC title

• A61M1/3641 Primary

  Pressure isolators · CPC title