Portable ventilator system

• US 8,156,937 B2
• Filed: 09/23/2005
• Issued: 04/17/2012
• Est. Priority Date: 08/04/2003
• Status: Active Grant

• Current Assignee: Vyaire Medical 203 Incorporated (Cardinal Health, Inc.)
• Original Assignee: Carefusion 303 Incorporated (Becton, Dickinson & Co)
• Inventors: DeVries, Douglas F., Boyle, David, Holmes, Michael, Williams, Malcolm
• Primary Examiner(s): Yu, Justine
• Assistant Examiner(s): DIXON, ANNETTE FREDRICKA
• Application Number:
  US11/234,636
• Publication Number:
  US 20060144396A1
• Time in Patent Office: 2,398 Days
• Field of Search: 128/200.24, 128/204.18, 128/204.21, 128/204.23, 128/205.11, 128/203.15, 128/203.12, 418/206.1, 418/206.5, 418/201.1, 418/201.3
• US Class Current: 128/205.11
• CPC Class Codes: A61M 11/00 Sprayers or atomisers specially adapted for therapeutic purposes in general B05B; aerosol containers B65D83/14
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0057 Pumps therefor
• CPC Class Codes: A61M 16/0063 Compressors
• CPC Class Codes: A61M 16/0066 Blowers or centrifugal pumps
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/026 specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
• CPC Class Codes: A61M 16/107 in the inspiratory path
• CPC Class Codes: A61M 16/12 by mixing different gases
• CPC Class Codes: A61M 16/202 electrically actuated
• CPC Class Codes: A61M 16/205 used for exhalation control
• CPC Class Codes: A61M 16/206 Capsule valves, e.g. mushroom, membrane valves
• CPC Class Codes: A61M 16/209 Relief valves
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2016/1025 the O2 concentration
• CPC Class Codes: A61M 2202/0208 Oxygen
• CPC Class Codes: A61M 2205/16 with back-up system in case of failure
• CPC Class Codes: A61M 2205/3317 Electromagnetic, inductive or dielectric measuring means
• CPC Class Codes: A61M 2205/3365 : Rotational speed
• CPC Class Codes: A61M 2205/3368 : Temperature
• CPC Class Codes: A61M 2205/3553 : remote, e.g. between patient's home and doctor's office
• CPC Class Codes: A61M 2205/3569 : sublocal, e.g. between console and disposable
• CPC Class Codes: A61M 2205/3584 : using modem, internet or bluetooth
• CPC Class Codes: A61M 2205/42 : Reducing noise
• CPC Class Codes: A61M 2205/505 : Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 2205/52 : with memories providing a history of measured variating parameters of apparatus or patient
• CPC Class Codes: A61M 2205/581 : by audible feedback
• CPC Class Codes: A61M 2205/583 : by visual feedback
• CPC Class Codes: A61M 2205/70 : with testing or calibration facilities
• CPC Class Codes: A61M 2205/8206 : battery-operated
• CPC Class Codes: A61M 2205/8237 : Charging means
• CPC Class Codes: A61M 2205/8262 : connectable to external power source, e.g. connecting to automobile battery through the cigarette lighter
• CPC Class Codes: A61M 2209/086 : Docking stations
• CPC Class Codes: A61M 2230/205 : partial oxygen pressure (P-O2)
• CPC Class Codes: A61M 2230/432 : partial CO2 pressure (P-CO2)
• CPC Class Codes: A61M 2230/435 : partial O2 pressure (P-O2)
• CPC Class Codes: H02P 6/17 : and for generating speed information

Abstract

A portable ventilator uses a Roots-type blower as a compressor to reduce both the size and power consumption of the ventilator. Various functional aspects of the ventilator are delegated to multiple subassemblies having dedicated controllers and software that interact with a ventilator processor to provide user interface functions, exhalation control and flow control servos, and monitoring of patient status. The ventilator overcomes noise problems through the use of a noise attenuating system comprising noise reducing pressure compensating orifices on the Roots blower housing and multiple noise reducing chambers. The ventilator is configured with a highly portable form factor, and may be used as a stand-alone device or as a docked device having a docking cradle with enhanced interface and monitoring capabilities.

Claims

1. A portable ventilator, comprising:

a blender module, including;

a pressurized gas inlet and a nebulizer drive port, wherein the blender module is configured to receive pressurized gas and aerosolized medication;

a Roots blower

to provide a flow of gas to a patient, including;

a housing,

an inlet port,

an outlet port, and

a pair of interlocking impellers disposed within the housing; and

a noise reducing chamber to attenuate noise produced by the Roots blower, including;

an enclosed interior space,

an inlet coupled to a filter and configured to intake room air, an outlet

coupled to the Roots blower inlet port,

a first muffler tube, disposed within the interior space and coupled to the inlet, having a plurality of perforations, and

a second perforated muffler tube, disposed within the interior space and coupled to the outlet, having a plurality of perforations such that the gas flows between the first and second muffler tubes only through the respective perforations;

wherein the room air from the filter and the combined gas flow from the blender module are coupled to the inlet port of the Roots blower via the first muffler tube.

2. The portable ventilator according to claim 1, wherein the first and second muffler tubes are positioned within the interior space of the noise reducing chamber in parallel.

3. The portable ventilator according to claim 1, wherein each muffler tube includes a plurality of tubular projections protruding respectively therefrom, each tubular projection including a perforation through which the gas flows.

4. The portable ventilator according to claim 3, wherein the tubular projections are disposed along the length of the first and second muffler tubes.

5. The portable ventilator according to claim 4, wherein the tubular projections protrude at right angles from the first and second muffler tubes.

6. The portable ventilator according to claim 1, wherein each interlocking impeller has a helical twist.

7. The portable ventilator according to claim 1, wherein the Roots blower housing includes tapered slots to reduce noise pulsations created by the impellers.

8. The portable ventilator according to claim 1, further comprising a plurality of resilient connectors to couple the Roots blower housing to a support structure.

9. A portable ventilator, comprising:

a blender module, including;

a pressurized gas inlet and a nebulizer drive port, wherein the blender module is configured to receive pressurized gas and aerosolized medication;

a Roots blower

to provide a flow of gas to a patient, including;

a housing,

an inlet port,

an outlet port, and

a pair of interlocking impellers disposed within the housing; and

a noise reducing chamber to attenuate noise produced by the Roots blower, including;

an enclosed interior space,

an inlet coupled to a Roots blower outlet port, said inlet configured to intake room air, an outlet

a first muffler tube, disposed within the interior space and coupled to the inlet, having a plurality of perforations, and

a second perforated muffler tube, disposed within the interior space and coupled to the outlet, having a plurality of perforations such that the gas flows between the first and second muffler tubes only through the respective perforations;

wherein the room air from the inlet and the combined gas flow from the blender module are coupled to the inlet port of the Roots blower via the first muffler tube.

10. The portable ventilator according to claim 9, wherein the first and second muffler tubes are positioned within the interior space of the noise reducing chamber in parallel.

11. The portable ventilator according to claim 9, wherein each muffler tube includes a plurality of tubular projections protruding respectively therefrom, each tubular projection including a perforation through which the gas flows.

12. The portable ventilator according to claim 11, wherein the tubular projections are disposed along the length of the first and second muffler tubes.

13. The portable ventilator according to claim 12, wherein the tubular projections protrude at right angles from the first and second muffler tubes.

14. The portable ventilator according to claim 9, wherein each interlocking impeller has a helical twist.

15. The portable ventilator according to claim 9, wherein the Roots blower housing includes tapered slots to reduce noise pulsations created by the impellers.

16. The portable ventilator according to claim 9, further comprising a plurality of resilient connectors to couple the Roots blower housing to a support structure.

17. A portable ventilator, comprising:

a blender module, including;

a pressurized gas inlet and a nebulizer drive port, wherein the blender module is configured to receive pressurized gas and aerosolized medication;

a Roots blower

to provide a flow of gas to a patient, including;

a housing,

an inlet port,

an outlet port, and

a pair of interlocking impellers disposed within the housing;

a first noise reducing chamber to attenuate noise produced by the Roots blower, including;

an enclosed interior space,

an inlet coupled to a filter and configured to intake room air, an outlet

coupled to the Roots blower inlet port,

a first muffler tube, disposed within the interior space and coupled to the inlet, having a plurality of perforations, and

a second perforated muffler tube, disposed within the interior space and coupled to the outlet, having a plurality of perforations such that the gas flows between the first and second muffler tubes only through the respective perforations; and

a second noise reducing chamber to attenuate noise produced by the Roots blower, including;

an enclosed interior space,

an inlet coupled to the Roots blower outlet port,

an outlet,

a first muffler tube, disposed within the interior space and coupled to the inlet, having a plurality of perforations, and

a second perforated muffler tube, disposed within the interior space and coupled to the outlet, having a plurality of perforations such that the gas flows between the first and second muffler tubes only through the respective perforations;

wherein the room air from the filter and the combined gas flow from the blender module are coupled to the inlet port of the Roots blower via the first muffler tube.

18. The portable ventilator according to claim 17, wherein the muffler tubes are positioned within the interior space of the noise reducing chambers in parallel.

19. The portable ventilator according to claim 17, wherein each muffler tube includes a plurality of tubular projections protruding respectively therefrom, each tubular projection including a perforation through which the gas flows.

20. The portable ventilator according to claim 19, wherein the tubular projections are disposed along the length of each muffler tubes.

21. The portable ventilator according to claim 20, wherein the tubular projections protrude at right angles from the first and second muffler tubes.

22. The portable ventilator according to claim 17, wherein each interlocking impeller has a helical twist.

23. The portable ventilator according to claim 17, wherein the Roots blower housing includes tapered slots to reduce noise pulsations created by the impellers.

24. The portable ventilator according to claim 17, wherein the noise reducing chambers reduce noise produced by the Roots blower by about 40 dBA.