# US 9,750,907 B2 · Portable positive airway pressure apparatus and method for attenuating the noise emitted therefrom

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- Number: US 9,750,907 B2
- Document ID: US9750907B2
- Status: Granted
- Kind: B2
- Application number: 14/216,922
- Filed: 2014-03-17
- Published: 2014-10-09
- Granted: 2017-09-05
- Earliest claimed: 2013-03-15
- Assignees: Human Design Medical, LLC
- Applicants: Human Design Medical, LLC
- Inventors: Kevin Scott Librett; Karl R Leinsing
- Web page: https://patentgrep.com/patent/US9750907B2

## CPC

- A61M 16/0066: {Blowers or centrifugal pumps}
- A61M 16/0069: {the speed thereof being controlled by respiratory parameters, e.g. by inhalation}
- A61M 16/022: {Control means therefor}
- A61M 16/0816: {Joints or connectors}
- A61M 16/0858: {Pressure sampling ports}
- A61M 16/0875: {Connecting tubes}
- A61M 16/107: {in the inspiratory path}
- F04D 29/4213: {suction ports}
- F04D 29/4226: {Fan casings}
- F04D 29/663: {Sound attenuation}
- F04D 29/664: {by means of sound absorbing material}
- F04D 29/665: {by means of resonance chambers or interference}
- G10K 11/04: Acoustic filters {; Acoustic resonators}
- G10K 11/161: {in systems with fluid flow (G10K11/162 takes precedence; gas flow silencers or exhaust apparatus for machines or engines in general or for internal combustion engine F01N, noise absorbers in pipes or pipe systems F16L55/02; noise absorption in air conditioning and ventilation F24F13/24; silencing exhaust or propulsion jets in aircraft B64D33/06)}
- A61M 16/0063: {Compressors}
- A61M 2016/0027: {pressure meter}
- A61M 2205/3355: Controlling downstream pump pressure
- A61M 2205/42: Reducing noise
- A61M 2205/50: with microprocessors or computers
- A61M 2205/502: User interfaces, e.g. screens or keyboards
- A61M 2205/505: Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
- A61M 2205/75: with filters
- A61M 2205/8206: battery-operated
- A61M 2207/00: Methods of manufacture, assembly or production
- F05D 2250/51: Inlet
- F05D 2260/96: Preventing, counteracting or reducing vibration or noise
- Y10T 29/49826: Assembling or joining
- 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)}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The systems and methods described herein provide a quiet, light-weight, and portable system and apparatus for providing positive air pressure to a patient. The systems may include a housing with an inlet port, a vibrationally isolated blower unit positioned in an inner chamber, and an outlet port for delivery of the pressurized air from the blower unit. The inlet port and outlet port may each have a tube with dimensions that are defined in relation to the inner chamber so as to reduce the overall noise output of the system.

## Claims

### Claim 1

A portable Continuous Positive Airway Pressure (CPAP) apparatus, comprising:
a housing, wherein the housing defines a first acoustic chamber and a second acoustic chamber, the first acoustic chamber having a volume and a first inlet port, the first inlet port defining a length and cross-sectional area that is proportionally related to the volume of the first chamber, the second acoustic chamber having a volume and a second inlet port, wherein the second inlet port extends from the first acoustic chamber into the second acoustic chamber;
a blower unit that being disposed within the second acoustic chamber; and
wherein the first inlet port includes an intake tube which extends from an exterior portion of the second acoustic chamber, passes through an interior portion of the second acoustic chamber, and into the first acoustic chamber.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the length and cross-sectional area of the first inlet port and the volume of the first acoustic chamber are proportionally related so as to create a low-pass acoustic filter.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the combined volume of the first and second acoustic chambers is less than 360 milliliters.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the first inlet port further comprises a first intake tube having a diameter ranging from 0.25 inches to 0.75 inches and a length ranging from 0.25 inches to 3.5 inches.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the second inlet port further comprises a second intake tube having a diameter ranging from 0.25 inches to 0.75 inches and a length ranging from 0.25 inches to 3.5 inches.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the housing further comprises an anechoic material disposed therein.

### Claim 7 (depends on 1)

The apparatus of claim 1, further comprising an adapter having a proximal end and a distal end, wherein the proximal end is in communication with the blower unit through a blower outlet tube and the distal end extending outward from the apparatus.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the blower outlet tube defines a sealed air-flow pathway between the blower unit and the adapter.

### Claim 9 (depends on 1)

The apparatus of claim 1, wherein the housing further defines a hose port configured to receive a patient interface system.

### Claim 10 (depends on 1)

The apparatus of claim 1, wherein the housing further comprises at least one user interface button.

### Claim 11 (depends on 1)

The apparatus of claim 1, wherein the housing further comprises a digital display.

### Claim 12 (depends on 1)

The apparatus of claim 1, wherein the housing further comprises an acoustically invisible cover positioned over the inlet port of the first acoustic chamber.

### Claim 13 (depends on 1)

The apparatus of claim 1, wherein the first inlet port comprises an intake tube which passes through the second chamber into the first chamber and is sealed from the second chamber.

### Claim 14 (depends on 13)

The apparatus of claim 13, further comprising an outlet tube extending from the blower in the second acoustic chamber and traversing through the first acoustic chamber and through the housing wall.

### Claim 15 (depends on 1)

The apparatus of claim 1, wherein the cross-sectional area and length of the first inlet port is related to the noise generated by the blower, wherein the overall acoustic reduction is balanced with any increase in blower noise generated.

### Claim 16 (depends on 1)

The apparatus of claim 1, wherein the volume of the second acoustic chamber is greater than the volume of the first acoustic chamber.