Fluid Delivery System, Fluid Path Set, and Pressure Isolation Mechanism with Hemodynamic Pressure Dampening Correction

Abstract

The fluid delivery system includes a pressurizing device for delivering injection fluid under pressure, a low pressure fluid delivery system, and a pressure isolation mechanism. The pressure isolation mechanism includes a first lumen associated with the pressurizing device, a second lumen associated with the low pressure fluid delivery system, and a pressure isolation port. The first valve is in a normally open position permitting fluid communication between the first lumen and the second lumen and movable to a closed position when fluid pressure in the first lumen reaches a predetermined pressure level. The first valve isolates the pressure isolation port from the first lumen in the closed position. A second valve is associated with the second lumen and regulates fluid flow through the second lumen. The second valve may be a disk valve defining one or more passageways in the form of slits through the body of the disk valve.

1 . A fluid delivery system, comprising: 
 a pressurizing device for delivering injection fluid under pressure;    a low pressure fluid delivery system; and    a pressure isolation mechanism comprising: 
 a first lumen associated with the pressurizing device, a second lumen associated with the low pressure fluid delivery system, and a pressure isolation port;  
 a first valve having a normally open position permitting fluid communication between the first lumen and the second lumen and movable to a closed position when fluid pressure in the first lumen reaches a predetermined pressure level, the first valve isolating the pressure isolation port from the first lumen in the closed position; and  
 a second valve associated with the second lumen and regulating fluid flow through the second lumen.  
   
   
   
       2 . A fluid delivery system as claimed in  claim 1 , wherein the first valve comprises a biasing portion biasing the first valve to the normally open position, and wherein the first valve is movable to the closed position when fluid pressure in the first lumen reaches a predetermined pressure level sufficient to overcome the biasing force of the biasing portion.  
   
   
       3 . A fluid delivery system as claimed in  claim 2 , wherein the first valve is contained within a valve housing and comprises a seat portion adapted to engage structure in the housing to define the closed position of the first valve.  
   
   
       4 . A fluid delivery system as claimed in  claim 3 , wherein the biasing portion is formed integral with the seat portion.  
   
   
       5 . A fluid delivery system as claimed in  claim 1 , wherein the second valve comprises a disk valve.  
   
   
       6 . A fluid delivery system as claimed in  claim 5 , wherein the disk valve comprises one or more passageways for regulating fluid flow through the second lumen.  
   
   
       7 . A fluid delivery system as claimed in  claim 6 , wherein the one or more passageways comprises one or more slits through the body of the disk valve.  
   
   
       8 . A fluid delivery system as claimed in  claim 5 , wherein the disk valve is secured in place in the second lumen by a sleeve.  
   
   
       9 . A fluid delivery system as claimed in  claim 1 , wherein the second valve regulates fluid flow in both directions in the second lumen.  
   
   
       10 . A fluid delivery system as claimed in  claim 1 , wherein the second valve permits fluid flow through the second lumen when fluid pressure reaches a predetermined pressure level in the second lumen.  
   
   
       11 . A fluid delivery system, comprising: 
 a pressurizing device for supplying injection fluid under pressure;    a low pressure fluid delivery system;    a pressure isolation mechanism comprising a first port adapted for connection to the pressurizing device, a second port adapted for connection to the patient, and a third port adapted for connection to the low pressure fluid delivery system, the pressure isolation mechanism comprising a first valve having a first state and a mutually exclusive second state, the first state occurring when the second and third ports are connected and the first and third ports are connected, and the second state occurring when the first and second ports are connected and the first and third ports are disconnected, the first valve being normally in the first state and being switchable to the second state when fluid pressure from the pressurizing device reaches a predetermined pressure level; and    a second valve associated with the third port and regulating fluid flow through the third port.    
   
   
       12 . A fluid delivery system as claimed in  claim 11 , wherein the first valve comprises a biasing portion biasing the first valve to the normally open position, and wherein the first valve is movable to the closed position when fluid pressure from the pressurizing device reaches a predetermined pressure level sufficient to overcome the biasing force of the biasing portion.  
   
   
       13 . A fluid delivery system as claimed in  claim 12 , wherein the first valve is contained within a valve housing and comprises a seat portion adapted to engage structure in the housing to define the closed position of the first valve.  
   
   
       14 . A fluid delivery system as claimed in  claim 13 , wherein the biasing portion is formed integral with the seat portion.  
   
   
       15 . A fluid delivery system as claimed in  claim 11 , wherein the second valve comprises a disk valve.  
   
   
       16 . A fluid delivery system as claimed in  claim 15 , wherein the disk valve comprises one or more passageways for regulating fluid flow through the third port.  
   
   
       17 . A fluid delivery system as claimed in  claim 16 , wherein the one or more passageways comprises one or more slits through the body of the disk valve.  
   
   
       18 . A fluid delivery system as claimed in  claim 15 , wherein the disk valve is secured in place in the third port by a sleeve.  
   
   
       19 . A fluid delivery system as claimed in  claim 11 , wherein the second valve regulates fluid flow in both directions in the third port.  
   
   
       20 . A fluid delivery system as claimed in  claim 11 , wherein the second valve permits fluid flow through the third port when fluid pressure reaches a predetermined pressure level.  
   
   
       21 . A pressure isolation mechanism comprising: 
 a valve body comprising a first lumen, a second lumen, and a pressure isolation port;    a first valve having a normally open position permitting fluid communication between the first lumen and the second lumen and movable to a closed position when fluid pressure in the first lumen reaches a predetermined pressure level sufficient, the first valve isolating the pressure isolation port from the first lumen in the closed position; and    a second valve associated with the second lumen for regulating fluid flow through the second lumen.    
   
   
       22 . A pressure isolation mechanism as claimed in  claim 21 , wherein the second valve comprises a disk valve.  
   
   
       23 . A pressure isolation mechanism as claimed in  claim 22 , wherein the disk valve comprises one or more passageways for regulating fluid flow through the second lumen.  
   
   
       24 . A pressure isolation mechanism as claimed in  claim 23 , wherein the one or more passageways comprises one or more slits through the body of the disk valve.  
   
   
       25 . A pressure isolation mechanism as claimed in  claim 22 , wherein the disk valve is secured in place in the second lumen by a sleeve.  
   
   
       26 . A pressure isolation mechanism as claimed in  claim 21 , wherein the second valve regulates fluid flow in both directions in the second lumen.  
   
   
       27 . A pressure isolation mechanism as claimed in  claim 21 , wherein the second valve permits fluid flow through the second lumen when fluid pressure reaches a predetermined pressure level.  
   
   
       28 . A method of correcting for dampened hemodynamic blood pressure signals in a fluid delivery system, comprising: 
 providing a pressure isolation mechanism comprising a first port connected to a pressurizing device for supplying injection fluid under pressure, a second port connected to a patient, and a third port connected to a low pressure fluid delivery system;    substantially isolating the low pressure fluid delivery system from hemodynamic blood pressure signals from the patient, and    reading the patient's hemodynamic blood pressure signals via a pressure transducer.    
   
   
       29 . A method as claimed in  claim 28 , wherein the low pressure fluid delivery system is isolated from hemodynamic blood pressure signals via a valve disposed in the third port.  
   
   
       30 . A method as claimed in  claim 29 , wherein the valve comprises a disk valve.