# US 2009/0260701 A1 · Pulsation attenuator for a fluidic system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0260701 A1 - Document ID: US20090260701A1 - Status: Published application - Kind: A1 - Application number: 12/425,830 - Filed: 2009-04-17 - Published: 2009-10-22 - Earliest claimed: 2005-12-07 - Assignees: Accuri Cytometers, Inc. - Inventors: Collin A. Rich; Nathaniel C. Bair - Web page: https://patentgrep.com/patent/US20090260701A1 ## CPC - F16L 55/04: Devices damping pulsations or vibrations in fluids {(F16L55/02 takes precedence)} - F04B 43/12: having peristaltic action - F15B 1/021: {used for damping} - F15B 1/10: with flexible separating means - F15B 21/008: {Reduction of noise or vibration} - F15B 2201/205: using gas - F15B 2201/215: using weights - F15B 2201/3151: the flexible separating means being diaphragms or membranes - G01N 15/1404: Handling flow, e.g. hydrodynamic focusing - G01N 15/1459: {the analysis being performed on a sample stream} - Y10T 137/3118: Surge suppression - 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 - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A pulsation attenuator for a fluidic system with a fluidic pump. The pulsation attenuator includes a fluidic channel, a first fluidic device adapted to attenuate pulsations, and a second fluidic device adapted to attenuate pulsations. Preferably, the first fluidic device includes a first fluidic resistor and a first fluidic capacitor, and the second fluidic device includes a second fluidic resistor and a second fluidic capacitor. Preferably, the first fluidic resistor and second fluidic resistor are resistive channels. Preferably, the first fluidic capacitor and second fluidic capacitor include a membrane that expands and accumulates fluid and then contracts and reintroduces the accumulated fluid into the fluidic channel. ## Claims ### Claim 1 A pulsation attenuator for a fluidic system with a fluidic pump, comprising: a fluidic channel; a first fluidic device connected to the fluidic channel and adapted to attenuate pulsations, wherein the first fluidic device includes a first fluidic resistor and a first fluidic capacitor; a second fluidic device connected to the fluidic channel and adapted to attenuate pulsations, wherein the second fluidic device includes a second fluidic resistor and a second fluidic capacitor; wherein the first fluidic resistor and the second fluidic resistor are resistive channels; and wherein the first fluidic capacitor and the second fluidic capacitor include a membrane that expands and accumulates fluid and then contracts and reintroduces the accumulated fluid into the fluidic channel. ### Claim 2 (depends on 1) The system of claim 1, wherein the system includes a bottom plate, wherein the membrane is a membrane sheet secured to the bottom plate, wherein the bottom plate and membrane sheet cooperate to form the first fluidic capacitor. ### Claim 3 (depends on 2) The system of claim 2, wherein the membrane sheet provides a restoring force of the first fluidic capacitor. ### Claim 4 (depends on 2) The system of claim 2, wherein the bottom plate includes the resistive channel of the first fluidic resistor. ### Claim 5 (depends on 4) The system of claim 4, wherein the resistive channel is a narrow channel. ### Claim 6 (depends on 4) The system of claim 4, wherein the first fluidic device further includes a top plate that interfaces with the bottom plate and that secured the membrane sheet between the bottom plate and the top plate, and wherein the bottom plate, the top plate, and the membrane sheet cooperate to form the first fluidic capacitor. ### Claim 7 (depends on 6) The system of claim 6, wherein the membrane sheet fluidically seals the interface of the bottom plate and top plate. ### Claim 8 (depends on 7) The system of claim 7, wherein the second fluidic device is substantially similar to the first fluidic device. ### Claim 9 (depends on 8) The system of claim 8, wherein the bottom plate, the top plate, and the membrane sheet form the first fluidic device and the second fluidic device. ### Claim 10 (depends on 9) The system of claim 9, wherein the first fluidic resistor and the second fluidic resistor have different fluidic resistance and the first fluidic capacitor and the second fluidic capacitor have different fluidic capacitance. ### Claim 11 (depends on 9) The system of claim 9, wherein the bottom plate, the top plate, and the membrane sheet additionally cooperate to form a second fluidic channel with an associated third fluidic device and fourth fluidic device, wherein the first, second, third, and fourth fluidic devices are substantially similar. ### Claim 12 (depends on 7) The system of claim 7, wherein the bottom plate includes a bottom open well that is defined along a first surface of the bottom plate, wherein the bottom open well forms a portion of the first fluidic capacitor; wherein the top plate includes a top open well that is define along a first surface of the top plate, wherein the top open well forms a portion of the first fluidic capacitor; and wherein the bottom open well aligns with the top open well. ### Claim 13 (depends on 12) The system of claim 12, wherein the top open well and membrane sheet form a sealed air chamber that can generate a restoring force of the first fluidic capacitor. ### Claim 14 (depends on 12) The system of claim 12, wherein the bottom plate includes: an inlet that communicates with the first fluidic resistor and first fluidic capacitor; an outlet that communicates with the inlet via the first fluidic resistor and first fluidic capacitor. ### Claim 15 (depends on 14) The system of claim 14, wherein the resistive channel is an open channel defined along the first surface of the bottom plate; and wherein the top plate includes a channel seal structure that is shaped to mate and seal the surface of the bottom plate along the resistive channel. ### Claim 16 (depends on 15) The system of claim 15, wherein the bottom plate and the top plate have corresponding insets that align the first surface of the bottom plate and the first surface of the top plate. ### Claim 17 (depends on 16) The system of claim 16, wherein the top plate and bottom plate are fastened together causing the corresponding insets to tighten the membrane sheet around the first fluidic resistor and first fluidic capacitor. ### Claim 18 (depends on 15) The system of claim 15, wherein the second fluidic device is substantially similar to the first fluidic device. ### Claim 19 (depends on 18) The system of claim 18, wherein the bottom plate, the top plate, and the membrane sheet form the first fluidic device and the second fluidic device. ### Claim 20 (depends on 19) The system of claim 19, wherein the bottom plate, the top plate, and the membrane sheet form five connected fluidic devices for a first fluidic channel, each fluidic device having a fluidic resistor and fluidic capacitor. ### Claim 21 (depends on 20) The system of claim 20, wherein the bottom plate, the top plate, and the membrane sheet further form a five connected fluidic devices for a second fluidic channel, each fluidic device having a fluidic resistor and fluidic capacitor. ### Claim 22 (depends on 21) The system of claim 21, wherein the five connected fluidic devices for the first fluidic channel are arranged in a substantially serpentine pattern and the five connected fluidic devices for the second fluidic channel are arranged outside of perimeter of the serpentine arrangement.