Flow based pressure isolation and fluid delivery system including flow based pressure isolation and flow initiating mechanism

Patent metadata

Field	Value
Publication number	US-2017100577-A1
Application number	US-201615385153-A
Country	US
Kind code	A1
Filing date	Dec 20, 2016
Priority date	Oct 18, 2001
Publication date	Apr 13, 2017
Grant date	—

Abstract

The fluid delivery system includes a pressurizing device for delivering a pressurized injection fluid, a low pressure fluid delivery system, and a pressure isolation mechanism adapted for fluid communication with the pressurizing device and low pressure fluid delivery system. The pressure isolation mechanism includes a housing defining an inlet port, an isolation port, and an internal cavity. The housing defines a seal seat in the internal cavity between the inlet port and isolation port. A valve member is disposed in the internal cavity. The valve member is free floating in the internal cavity and is adapted to engage the seal seat. The valve member has an open position permitting fluid communication between the inlet port and isolation port, and is fluid flow responsive to fluid flow in the inlet port to engage the seal seat and attain a closed position preventing fluid flow between the inlet port and isolation port.

First claim

What is claimed is:

1 . A method of protecting a pressure transducer from fluid pressure damage using a pressure isolation mechanism comprising an inlet port, an isolation port, and an internal cavity wherein a free floating, fluid flow responsive valve member is disposed and adapted to engage a seal seat in the internal cavity, and a flow initiating mechanism is associated with the isolation port, the method comprising:
associating the pressure transducer with the isolation port; placing a pressurizing device for delivering fluid under pressure in fluid connection with the inlet port; actuating the pressurizing device to cause fluid flow in the inlet port such that the free floating, fluid flow responsive valve member engages the seal seat to attain a substantially closed position and prevent fluid flow between the inlet port and isolation port; and wherein upon actuation of the pressure device, the flow initiating mechanism initiates flow around the valve member such that the valve member operates to the closed position substantially upon fluid flow initiation.

2 . A method as claimed in claim 1 , further comprising deactuating the pressurizing device and allowing the valve member to attain an open position disengaged from the seal seat permitting fluid communication between the inlet port and isolation port.

3 . A method as claimed in claim 2 , further comprising reading hemodynamic pressure signals with a pressure transducer transmitted via the fluid communication between the inlet port and isolation port in the open position of the valve member.

4 . A method as claimed in claim 1 , further comprising reading hemodynamic pressure signals with the pressure transducer transmitted at least in part through the body of the valve member or a portion thereof in the closed position.

Assignees

• Bayer Healthcare Llc

Inventors

• Spohn Michael A
• Haury John A
• Schriver Ralph H

Classifications

• A61M39/24 Primary

  Check- or non-return valves · CPC title

• A61M5/14546

  Front-loading type injectors · CPC title

• A61B5/02141

  Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits (A61B5/02233, A61B5/0235 take precedence) · CPC title

• A61M5/142

  Pressure infusion, e.g. using pumps · CPC title

• A61M2039/229

  Stopcocks · CPC title