Diaphragm Pressure Pod For Medical Fluids

Patent metadata

Field	Value
Publication number	US-2016303306-A1
Application number	US-201615195558-A
Country	US
Kind code	A1
Filing date	Jun 28, 2016
Priority date	Nov 9, 2005
Publication date	Oct 20, 2016
Grant date	—

Abstract

A tubular medical fluid flow set comprises a pressure sensing chamber connected in flow-through relation to fluid flow tubing of the set. The pressure sensing chamber defines a movable, flexible, impermeable diaphragm dividing the chamber into two separate compartments. The fluid flow tubing communicates with one of the compartments and is isolated from the other of the compartments. A port is carried on the chamber, the port having a seal therein, and communicating with the other of the compartments. Thus, the other of the compartments is hermetically sealed until the port is opened for connection with a pressure measuring device, to keep the flexible diaphragm in a desired, initial position prior to opening of the seal.

First claim

1 . A tubular blood flow set which comprises:
a pressure sensing pod defining a chamber, said pod being connected in flow-through relation to blood flow tubing of said set, said set defining a length of pressure tubing connectable at one end with said chamber via a pressure port thereof, for connection at the other pressure tubing end with a pressure measuring equipment connector with said pod being spaced from said connector; and a flexible diaphragm sealingly mounted within said pod between connections of said blood flow tubing and said pressure tubing, said diaphragm being moveable between first and second positions, the diaphragm in said first position bowing outwardly to substantially maximize volume in said chamber that communicates with said blood flow tubing, the diaphragm in said second position bowing inwardly to substantially minimize but not eliminate the blood volume in said chamber that is inside of said diaphragm, said diaphragm in use being in contact on one side thereof with flowing blood; the pressure port being in communication with said chamber on a side of said diaphragm opposite said connections of said blood flow tubing; the pod being provided, prior to use, with said diaphragm in a desired one of the first and second positions by means of:
said diaphragm having a central dome portion that can flip between said first position said second position;
said pressure port having a seal therein the keeps the diaphragm in said desired one of said first and second positions until connection with a pressure measuring device causes said seal to open.

2 . The set of claim 1 , wherein the pod is provided, prior to use, in one of the first and second positions by means of said diaphragm having a central dome portion that can flip between said first position said second position.

3 . The set of claim 1 , wherein the pod is provided, prior to use, in one of the first and second positions by means of said pressure port having a seal therein the keeps the diaphragm in a desired one of said first and second positions until connection with a pressure measuring device causes said seal to open.

4 . The set of claim 2 , wherein the length of pressure tubing permanently connected said one end with said chamber via said pressure port.

5 . The set of claim 2 , wherein the dome portion has a continuous curved cross-section.

6 . The set of claim 3 , wherein the pressure tubing is unconnected to the pressure port.

7 . The set of claim 6 , wherein the pressure tubing has a connector connectable to said pressure port, said connector containing a member that breaks said seal.

8 . A tubular blood flow set which comprises:
first and second pressure sensing pods, each defining a chamber; said first pod being connected in flow-through relation to an arterial blood flow tubing portion of said set; said first pod being connected in flow-through relation to a venous blood flow tubing portion of said set; for each of said first and second pods, a length of pressure tubing connectable at one end with said chamber thereof via a pressure port thereof, for connection at the other pressure tubing end with a respective pressure measuring equipment connector to permit said each of said first and second pods to be spaced from said respective pressure measuring equipment; and said each of said pods having a flexible diaphragm sealingly mounted within said each of said pods between connections of said arterial and venous blood flow tubing and said pressure tubing, said diaphragm being moveable between first and second positions, the diaphragm in said first position bowing outwardly to substantially maximize volume in said chamber that communicates with said blood flow tubing, the diaphragm in said second position bowing inwardly to substantially minimize but not eliminate the blood volume in said chamber that is inside of said diaphragm, said diaphragm in use being in contact on one side thereof with flowing blood; the pressure port being in communication with said chamber on a side of said diaphragm opposite said connections of said blood flow tubing; said diaphragm having a central dome portion that can flip between said first position said second position the first pod diaphragm, prior to use, being arranged in the first position; the second pod diaphragm, prior to use, being arranged in the second position.

9 . The set of claim 8 , wherein each length of pressure tubing is permanently connected by said one end with a respective one of said chambers via a respective one of said pressure ports.

10 . The set of claim 8 , wherein the dome portion has a continuous curved cross-section.

Assignees

• Nxstage Medical Inc

Inventors

• Schnell William J
• Bell David
• Wilson Karen
• Utterberg David S

Classifications

• A61M1/3627

  Degassing devices; Buffer reservoirs; Drip chambers; Blood filters · CPC title

• A61M1/16

  with membranes · CPC title

• A61M1/3655

  Arterio-venous shunts or fistulae · CPC title

• A61M1/3641 Primary

  Pressure isolators · CPC title

• Y10T137/85978

  With pump · CPC title