# US 12,263,292 B2 · Dampening element for fluid management system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,263,292 B2 - Document ID: US12263292B2 - Status: Granted - Kind: B2 - Application number: 16/719,011 - Filed: 2019-12-18 - Published: 2020-06-25 - Granted: 2025-04-01 - Earliest claimed: 2018-12-19 - Assignees: Boston Scientific Scimed, Inc. - Applicants: Boston Scientific Scimed, Inc. - Inventors: Michael S. H. Chu; Mayur kiran Patel; Sacha Tang - Web page: https://patentgrep.com/patent/US12263292B2 ## CPC - A61M 1/772: {operating alternately} - A61M 1/73: {comprising sensors or indicators for physical values} - F16L 55/04: Devices damping pulsations or vibrations in fluids {(F16L55/02 takes precedence)} - A61M 1/30: Single needle dialysis {; Reciprocating systems, alternately withdrawing blood from and returning it to the patient, e.g. single-lumen-needle dialysis or single needle systems for hemofiltration or pheresis} - A61M 1/3604: {in opposite directions} - A61M 5/16886: {for measuring fluid flow rate, i.e. flowmeters} - A61M 2205/3334: Measuring or controlling the flow rate - A61M 2206/22: eliminating pulsatile flows, e.g. by the provision of a dampening chamber - F04B 11/0008: {using accumulators} - F04B 11/0016: {with a fluid spring} - F04B 11/0033: {with a mechanical spring} - F04B 39/0027: {Pulsation and noise damping means} - F15B 1/021: {used for damping} - 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)} - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ## Abstract A fluid management system may include a fluid pump capable of generating a pulsatile flow of fluid, a fluid pathway for transporting the pulsatile flow of fluid from a fluid source through the fluid pump to a medical device, a dampening element in fluid communication with the fluid pathway and operably independent of the fluid pump, the dampening element comprising one or more barrels, each barrel including a movable seal member disposed within the barrel and a biasing member disposed within the barrel and engaged with the movable seal member, the dampening element being responsive to pressure fluctuations of the pulsatile fluid flow to actively dampen the pressure fluctuations, and a fluid flow sensor disposed along the fluid pathway between the dampening element and the medical device to measure a flow rate of the smoothened pulsatile fluid flow in both flow directions. ## Claims ### Claim 1 A fluid management system, comprising: a fluid pump capable of generating a pulsatile flow of fluid; a fluid pathway for transporting the pulsatile flow of fluid from a fluid source through the fluid pump to a medical device; a dampening element in fluid communication with the fluid pathway, the dampening element comprising a first barrel and a second barrel each having a first end with a port in fluid communication with the fluid pathway and an opposing second end, the dampening element being responsive to pressure fluctuations of the pulsatile fluid flow to actively dampen the pressure fluctuations and smoothen the pulsatile fluid flow in both flow directions of the fluid pathway; wherein the first barrel includes a first movable seal member disposed within the first barrel, a first biasing member disposed within the first barrel and engaged with the first movable seal member, and a first cap secured to the second end of the first barrel, wherein the first biasing member is disposed between the first movable seal member and the first cap; and wherein the second barrel includes a second movable seal member disposed within the second barrel, a second biasing member disposed within the second barrel and engaged with the second movable seal member, and a second cap secured to the second end of the second barrel, wherein the second biasing member is disposed between the second movable seal member and the first end of the second barrel. ### Claim 2 (depends on 1) The fluid management system of claim 1, wherein the first barrel dampens the pulsatile fluid flow in a distal direction of the fluid pathway. ### Claim 3 (depends on 1) The fluid management system of claim 1, wherein the second barrel dampens the pulsatile fluid flow in a proximal direction of the fluid pathway. ### Claim 4 (depends on 1) The fluid management system of claim 1, wherein the first barrel is independent of the second barrel. ### Claim 5 (depends on 1) The fluid management system of claim 1, wherein the first barrel and the second barrel are formed within a single monolithic structure. ### Claim 6 (depends on 1) The fluid management system of claim 1, wherein the first barrel includes a cylindrical lumen; and wherein the first movable seal member has a disk-like structure comprising at least one sealing element extending around a perimeter of the disk-like structure; wherein the at least one sealing element is configured to sealingly engage an inner surface of the cylindrical lumen. ### Claim 7 (depends on 6) The fluid management system of claim 6, wherein the at least one sealing element comprises two or more O-rings. ### Claim 8 (depends on 6) The fluid management system of claim 6, wherein the first biasing member is a spring. ### Claim 9 (depends on 6) The fluid management system of claim 6, wherein the first biasing member is configured to translate an entirety of the first movable seal member along the inner surface of the cylindrical lumen in response to the pressure fluctuations of the pulsatile fluid flow. ### Claim 10 (depends on 1) The fluid management system of claim 1, wherein the second barrel includes a cylindrical lumen; and wherein the second movable seal member has a disk-like structure comprising at least one sealing element extending around a perimeter of the disk-like structure; wherein the at least one sealing element is configured to sealingly engage an inner surface of the cylindrical lumen. ### Claim 11 (depends on 10) The fluid management system of claim 10, wherein the at least one sealing element comprises two or more O-rings. ### Claim 12 (depends on 10) The fluid management system of claim 10, wherein the second biasing member is a spring. ### Claim 13 (depends on 10) The fluid management system of claim 10, wherein the second biasing member is configured to translate an entirety of the second movable seal member along the inner surface of the cylindrical lumen in response to the pressure fluctuations of the pulsatile fluid flow. ### Claim 14 A fluid management system, comprising: a fluid pump capable of generating a pulsatile flow of fluid; a fluid pathway for transporting the pulsatile flow of fluid from a fluid source through the fluid pump to a medical device; a dampening element in fluid communication with the fluid pathway, the dampening element comprising a first barrel and a second barrel each having a first end with a port in fluid communication with the fluid pathway and an opposing second end, the dampening element being responsive to pressure fluctuations of the pulsatile fluid flow to actively dampen the pressure fluctuations and smoothen the pulsatile fluid flow; and a fluid flow sensor disposed along the fluid pathway between the dampening element and the medical device to measure a flow rate of the pulsatile fluid flow in both flow directions of the fluid pathway; wherein the first barrel includes a first movable seal member disposed within the first barrel, a first biasing member disposed within the first barrel and engaged with the first movable seal member, and a first cap secured to the second end of the first barrel, wherein the first biasing member is disposed between the first movable seal member and the first cap, the first barrel being configured to dampen the pressure fluctuations in a distal direction of the fluid pathway; wherein the second barrel includes a second movable seal member disposed within the second barrel, a second biasing member disposed within the second barrel and engaged with the second movable seal member, and a second cap secured to the second end of the second barrel, wherein the second biasing member is disposed between the second movable seal member and the first end of the second barrel, the second barrel being configured to dampen the pressure fluctuations in a proximal direction of the fluid pathway; wherein the first barrel and the second barrel are both positioned between the fluid pump and the fluid flow sensor. ### Claim 15 (depends on 14) The fluid management system of claim 14, wherein the first biasing member is a spring. ### Claim 16 (depends on 15) The fluid management system of claim 15, wherein the spring is in compression. ### Claim 17 (depends on 14) The fluid management system of claim 14, wherein the second biasing member is a spring. ### Claim 18 (depends on 17) The fluid management system of claim 17, wherein the spring is in tension. ### Claim 19 (depends on 14) The fluid management system of claim 14, wherein the first biasing member is configured to move the first movable seal member along an inner surface of the first barrel in response to the pressure fluctuations of the pulsatile fluid flow. ### Claim 20 (depends on 14) The fluid management system of claim 14, wherein the second biasing member is configured to move the second movable seal member along an inner surface of the second barrel in response to the pressure fluctuations of the pulsatile fluid flow.