DOUGLAS FRED DEVRIES
Pilots at Arrowhead Dr, Bothell, WA
License number
Washington A2245203
Issued Date
Apr 2016
Expiration Date
Apr 2018
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
5812 NE Arrowhead Dr, Bothell, WA 98028
Professional information
Method And Apparatus For Attenuating Compressor Noise
US Patent:
7527053, May 5, 2009
Filed:
Mar 23, 2005
Appl. No.:
11/088316
Inventors:
Douglas F. DeVries - Kenmore WA, US
Malcolm R. Williams - San Clemente CA, US
Malcolm R. Williams - San Clemente CA, US
Assignee:
Cardinal Health 203, Inc. - Wilmington DE
International Classification:
A61M 16/00
US Classification:
12820421, 12820418
Abstract:
The invention comprises a method and apparatus for reducing the noise generated by compressors, including Roots-type blowers. The invention has particular use for reducing noise generated by compressors used in mechanical ventilators, though the advantages thereof may be realized in many different applications. One embodiment of the invention comprises a noise-attenuating gas flow path for a compressor contained in a portable ventilator housing. In one embodiment, the gas flow path comprises a plurality of chambers interconnected by flow tubes. The flow path is folded so as to fit into the limited space of a portable ventilator housing. The dimensions of the chambers and the flow tubes are selected so that an impedance mismatch is created between the chambers and the flow tubes. In one embodiment of the invention, the flow path comprises one or more perforated tubes located in one or more of the chambers. The perforated tube has a port through which gas is accepted and at least one exterior tube through which gas exits.
Method And Apparatus For Reducing Noise In A Roots-Type Blower
US Patent:
2005011, May 26, 2005
Filed:
Nov 10, 2004
Appl. No.:
10/985528
Inventors:
Douglas DeVries - Kenmore WA, US
Malcolm Williams - San Clemente CA, US
Malcolm Williams - San Clemente CA, US
International Classification:
F01C001/18
US Classification:
418206100
Abstract:
A Roots-type blower comprises a housing defining a rotor chamber and an inlet and outlet to the rotor chamber. First and second rotors are mounted in the rotor chamber, each rotor defining a plurality of lobes, adjacent lobes and the housing cooperating to define gas transport chambers. The blower is configured so that a net flow rate of gas into a gas transport chamber is generally or approximately constant, whereby a change in gas pressure in the gas transport chamber is generally or approximately linear, as the gas transport chamber approaches the outlet. In one embodiment, this is accomplished by providing flow channels extending from the outlet towards the inlet, and from the inlet towards the outlet, corresponding to each rotor. The flow channels permit gas to flow from the high pressure outlet to a gas transport chamber and from the gas transport chamber to the low pressure inlet. The resulting amelioration of pressure spikes associated with flow back substantially reduces the operational noise level of the blower.
Mechanical Ventilation System Utilizing Bias Valve
US Patent:
8118024, Feb 21, 2012
Filed:
Jul 13, 2006
Appl. No.:
11/486346
Inventors:
Douglas F. DeVries - Kenmore WA, US
Todd Allum - Redlands CA, US
Todd Allum - Redlands CA, US
Assignee:
CareFusion 203, Inc. - San Diego CA
International Classification:
A61M 16/00, A62B 9/02
US Classification:
12820421, 12820024, 12820418, 12820524
Abstract:
A portable mechanical ventilator having a ROOTS® blower is configured to provide a desired gas flow and pressure to a patient circuit. The mechanical ventilator includes a flow meter operative to measure gas flow produced by the ROOTS® blower and an exhalation control module configured to operate an exhalation valve connected to the patient circuit. A bias valve connected between the ROOTS® blower and the patient circuit is specifically configured to generate a bias pressure relative to the patient circuit pressure at the exhalation control module. The bias valve is further configured to attenuate pulsating gas flow produced by the ROOTS® blower such that gas flowing to the mass flow meter exhibits a substantially constant pressure characteristic. The bias pressure facilitates closing of the exhalation valve at the start of inspiration, regulates positive end expiratory pressure during exhalation, and purges sense lines via a pressure transducer module.
Mechanical Ventilation System Utilizing Bias Valve
US Patent:
2011008, Apr 21, 2011
Filed:
Dec 21, 2010
Appl. No.:
12/975308
Inventors:
Douglas F. DeVries - Kenmore WA, US
Todd Allum - Redlands CA, US
Todd Allum - Redlands CA, US
International Classification:
A61M 16/20
US Classification:
12820524
Abstract:
A portable mechanical ventilator having a Roots blower is configured to provide a desired gas flow and pressure to a patient circuit. The mechanical ventilator includes a flow meter operative to measure gas flow produced by the Roots blower and an exhalation control module configured to operate an exhalation valve connected to the patient circuit. A bias valve connected between the Roots blower and the patient circuit is specifically configured to generate a bias pressure relative to the patient circuit pressure at the exhalation control module. The bias valve is further configured to attenuate pulsating gas flow produced by the Roots blower such that gas flowing to the mass flow meter exhibits a substantially constant pressure characteristic. The bias pressure facilitates closing of the exhalation valve at the start of inspiration, regulates positive end expiratory pressure during exhalation, and purges sense lines via a pressure transducer module.
Portable Ventilator System
US Patent:
2008005, Mar 6, 2008
Filed:
Oct 31, 2007
Appl. No.:
11/979142
Inventors:
Douglas DeVries - Kenmore WA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
International Classification:
A61M 15/00, A61M 16/00
US Classification:
128204210, 128204180, 128204230, 128204240, 128204260
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 noise reducing pressure compensating orifices on the ROOTS-type blower housing and multiple baffling 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.
Portable Ventilator System
US Patent:
8156937, Apr 17, 2012
Filed:
Sep 23, 2005
Appl. No.:
11/234636
Inventors:
Douglas F. DeVries - Kenmore WA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
Assignee:
CareFusion 203, Inc. - San Diego CA
International Classification:
A62B 7/00, A62B 9/00, A61M 16/00
US Classification:
12820511, 12820423, 12820421, 12820418, 12820024, 12820315, 12820312
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.
Portable Ventilator System
US Patent:
8297279, Oct 30, 2012
Filed:
Jun 2, 2006
Appl. No.:
11/445724
Inventors:
Douglas F. DeVries - Kenmore WA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
Assignee:
CareFusion 203, Inc. - San Diego CA
International Classification:
A62B 7/00, A61M 16/00
US Classification:
12820421, 12820418, 12820024
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 noise reducing pressure compensating orifices on the ROOTS-type blower housing and multiple baffling 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.
Portable Ventilator System
US Patent:
7188621, Mar 13, 2007
Filed:
Aug 4, 2004
Appl. No.:
10/912747
Inventors:
Douglas F. DeVries - Kenmore WA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
Assignee:
Pulmonetic Systems, Inc. - Minneapolis MN
International Classification:
A61M 15/00, A61M 16/00
US Classification:
12820421, 12820426, 12820418, 12820423, 12820024
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 noise reducing pressure compensating orifices on the ROOTS-type blower housing and multiple baffling 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.
Portable Ventilator System
US Patent:
8522780, Sep 3, 2013
Filed:
Mar 1, 2007
Appl. No.:
11/712929
Inventors:
Douglas F. DeVries - Kenmore WA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
Assignee:
CareFusion 203, Inc. - San Diego CA
International Classification:
A62B 7/00, A61M 16/00
US Classification:
12820421, 12820024, 12820418, 12820423, 12820511
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 noise reducing pressure compensating orifices on the ROOTS-type blower housing and multiple baffling 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.
Portable Ventilator System
US Patent:
8627819, Jan 14, 2014
Filed:
Jun 2, 2006
Appl. No.:
11/445762
Inventors:
Douglas F. DeVries - Kenmore WA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
David Boyle - Monrovia CA, US
Michael Holmes - Corona CA, US
Malcolm Williams - San Clemente CA, US
Assignee:
CareFusion 203, Inc. - San Diego CA
International Classification:
A61M 16/00
US Classification:
12820421, 12820418, 12820024, 12820523
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 noise reducing pressure compensating orifices on the Roots blower housing and multiple baffling 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.