# US 7,610,936 B2 · Flow based pressure isolation mechanism for a fluid delivery system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,610,936 B2 - Document ID: US7610936B2 - Status: Granted - Kind: B2 - Application number: 11/931,594 - Filed: 2007-10-31 - Published: 2008-03-06 - Granted: 2009-11-03 - Earliest claimed: 2006-12-22 - Assignees: Medrad, Inc. - Inventors: Michael A. Spohn; John A. Haury - Web page: https://patentgrep.com/patent/US7610936B2 ## CPC - A61M 39/24: Check- or non-return valves - A61B 5/02141: {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)} - A61B 5/0215: by means inserted into the body - A61M 5/007: {for contrast media} - A61M 5/142: Pressure infusion, e.g. using pumps - A61M 5/14546: {Front-loading type injectors} - A61M 5/16881: {Regulating valves} - A61M 5/172: electrical or electronic - A61M 5/1408: {in parallel, e.g. by manifolds or with sequencing valves} - A61M 5/16827: {controlling delivery of multiple fluids, e.g. sequencing, mixing or via separate flow-paths (infusion of multiple fluids without using a controller A61M5/1407)} - A61M 5/16831: {Monitoring, detecting, signalling or eliminating infusion flow anomalies (low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066)} - A61M 5/1684: {by detecting the amount of infusate remaining, e.g. signalling end of infusion} - A61M 5/365: {Air detectors (A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626)} - A61M 39/229: {Single-way cut-off valves} - A61M 2005/1403: {Flushing or purging} - A61M 2039/2433: {Valve comprising a resilient or deformable element, e.g. flap valve, deformable disc} - A61M 2039/2453: {not being fixed to the valve body} - A61M 2039/2473: {Valve comprising a non-deformable, movable element, e.g. ball-valve, valve with movable stopper or reciprocating element} - A61M 2039/248: {Ball-valve} - A61M 2205/3306: Optical measuring means - A61M 2205/3362: with minimised length of fluid lines; Taking into account the elastic expansion of fluid lines to increase accuracy - A61M 2205/581: by audible feedback - A61M 2205/583: by visual feedback - Y10T 137/0352: Controlled by pressure - Y10T 137/7758: Pilot or servo controlled - Y10T 137/7871: Weight biased - Y10T 137/7915: Guide stem - Y10T 137/85978: With pump - Y10T 137/87829: Biased valve - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## 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. ## Claims ### Claim 1 A flow-based pressure isolation mechanism, comprising: a housing body defining an inlet port, an isolation port, an internal cavity disposed between the inlet port and the isolation port, a seal seat in the internal cavity between the inlet port and the isolation port, and a flow initiating port defining a branch lumen in fluid communication with the isolation port; a valve member disposed within and free floating in the internal cavity and comprising a disk-shaped body having top and bottom projections extending from top and bottom sides, respectively, of the disk-shaped body and adapted to center the valve member within the internal cavity, the valve member adapted to move between an open position permitting fluid communication between the inlet port and the isolation port and a closed position preventing fluid flow between the inlet port and the isolation port, wherein the valve member is fluid flow responsive to fluid flow in the inlet port to engage the seal seat and thereby attain the closed position preventing fluid flow between the inlet port and the isolation port; and a flow initiating mechanism associated with the flow initiating port and adapted to provide sufficient upstream capacitance to initiate fluid flow around the valve member such that the valve member moves to the closed position substantially upon flow initiation, the flow initiating mechanism comprising a flow initiating member disposed and retained within the branch lumen by a retainer and an air inlet prevention filter disposed in a bore defined in the retainer and adapted to prevent air from entering the internal cavity when the filter is wetted with fluid. ### Claim 2 (depends on 1) A flow-based pressure isolation mechanism as claimed in claim 1, further comprising a pressure transducer associated with the isolation port. ### Claim 3 (depends on 1) A flow-based pressure isolation mechanism as claimed in claim 1 wherein the valve member is formed of compliant material. ### Claim 4 (depends on 3) A flow-based pressure isolation mechanism as claimed in claim 3 wherein the compliant material is selected to transmit hemodynamic pressure signals through the valve member to a pressure transducer associated with the isolation port. ### Claim 5 (depends on 1) A flow-based pressure isolation mechanism as claimed in claim 1 wherein the housing body further defines a second seal seat radially outward and concentric to the first seal seat. ### Claim 6 A fluid delivery system with flow-based pressure isolation, comprising: a pressurizing device for delivering injection fluid under pressure; a low pressure fluid delivery system; and a pressure isolation mechanism adapted for fluid communication with the pressurizing device and the low pressure fluid delivery system, and comprising: a housing body defining an inlet port, an isolation port, an internal cavity disposed between the inlet port and the isolation port, a seal seat in the internal cavity between the inlet port and the isolation port, and a flow initiating port defining a branch lumen in fluid communication with the isolation port; a valve member disposed within and free floating in the internal cavity and comprising a disk-shaped body having top and bottom projections extending from top and bottom sides, respectively, of the disk-shaped body and adapted to center the valve member within the internal cavity, the valve member adapted to move between an open position permitting fluid communication between the inlet port and the isolation port and a closed position preventing fluid flow between the inlet port and the isolation port, wherein the valve member is fluid flow responsive to fluid flow in the inlet port to engage the seal seat and thereby attain the closed position preventing fluid flow between the inlet port and the isolation port; and a flow initiating mechanism associated with the flow initiating port and adapted to provide sufficient upstream capacitance to initiate fluid flow around the valve member such that the valve member moves to the closed position substantially upon flow initiation, the flow initiating mechanism comprising a flow initiating member disposed and retained within the branch lumen by a retainer and an air inlet prevention filter disposed in a bore defined in the retainer and adapted to prevent air from entering the internal cavity when the filter is wetted with fluid. ### Claim 7 (depends on 6) A fluid delivery system as claimed in claim 6 wherein the inlet port is in fluid communication with the pressurizing device and the low pressure fluid delivery system via a fitting. ### Claim 8 (depends on 6) A fluid delivery system as claimed in claim 6, further comprising a pressure transducer associated with the isolation port. ### Claim 9 (depends on 6) A fluid delivery system as claimed in claim 6 wherein the valve member is formed of compliant material. ### Claim 10 (depends on 9) A fluid delivery system as claimed in claim 9 wherein the compliant material is selected to transmit hemodynamic pressure signals through the valve member to a pressure transducer associated with the isolation port. ### Claim 11 (depends on 6) A fluid delivery system as claimed in claim 6 wherein the housing body further defines a second seal seat radially outward and concentric to the first seal seat. ### Claim 12 (depends on 1) A flow-based pressure isolation mechanism as claimed in claim 1 wherein an aperture connects the internal cavity with the isolation port and the top projection of the valve member extends through the aperture. ### Claim 13 (depends on 1) A flow-based pressure isolation mechanism as claimed in claim 1 wherein the disk-shaped body further comprises a series of tab members provided on the bottom side thereof. ### Claim 14 (depends on 1) A flow-based pressure isolation mechanism as claimed in claim 1 wherein the branch lumen comprises a first portion and a larger, stepped portion, the flow initiating member being positioned within the first portion and the retainer being positioned within the stepped portion. ### Claim 15 (depends on 14) A flow-based pressure isolation mechanism as claimed in claim 14 wherein an amount of radial clearance is provided radially about the flow initiating member and an inner wall of the first portion of the branch lumen and an amount of distal clearance is provided at a distal end of the air inlet prevention filter. ### Claim 16 (depends on 1) A flow-based pressure isolation mechanism as claimed in claim 1 wherein the upstream capacitance is provided by the flow initiating member being adapted to compress in an axial direction within the branch lumen to thereby allow fluid to pass around the flow initiating member and into contact with the air inlet prevention filter. ### Claim 17 (depends on 6) A fluid delivery system as claimed in claim 6 wherein an aperture connects the internal cavity with the isolation port and the top projection of the valve member extends through the aperture. ### Claim 18 (depends on 6) A fluid delivery system as claimed in claim 6 wherein the disk-shaped body further comprises a series of tab members provided on the bottom side thereof. ### Claim 19 (depends on 6) A fluid delivery system as claimed in claim 6 wherein the branch lumen comprises a first portion and a larger, stepped portion, the flow initiating member being positioned within the first portion and the retainer being positioned within the stepped portion. ### Claim 20 (depends on 19) A fluid delivery system as claimed in claim 19 wherein an amount of radial clearance is provided radially about the flow initiating member and an inner wall of the first portion of the branch lumen and an amount of distal clearance is provided at a distal end of the air inlet prevention filter. ### Claim 21 (depends on 6) A fluid delivery system as claimed in claim 6 wherein the upstream capacitance is provided by the flow initiating member being adapted to compress in an axial direction within the branch lumen to thereby allow fluid to pass around the flow initiating member and into contact with the air inlet prevention filter. ### Claim 22 (depends on 7) A fluid delivery system as claimed in claim 7 wherein the fitting defines a first input port in fluid communication with the pressurizing device, a second input port in fluid communication with the low pressure fluid delivery system, an outlet port and a pressure transducer port in fluid communication with the inlet port of the pressure isolation mechanism. ### Claim 23 (depends on 22) A fluid delivery system as claimed in claim 22 wherein the inlet port of the pressure isolation mechanism is adapted to mate with the pressure transducer port of the fitting via a threaded or a welded connection. ### Claim 24 (depends on 22) A fluid delivery system as claimed in claim 22 wherein the bottom projection of the valve member projects into the pressure transducer port of the fitting. ### Claim 25 (depends on 7) A fluid delivery system as claimed in claim 7 wherein the fining is a Y-T fitting.