Edwin B Merrick

US Patent:

6467478, Oct 22, 2002

Filed:

Feb 2, 2000

Appl. No.:

09/598287

Inventors:

Edwin B. Merrick - Stow MA 01775
Glen N. Gee - Carlsbad CA 92008
John OMahony - Newcastle, Galway, IE
John ODea - Knocknacarra, Galway, IE

International Classification:

A61M 1600

US Classification:

12820325, 12820518

Abstract:

The gas mixing apparatus provides the components of a breathing gas for mixing at approximately ambient atmospheric pressure, and regulates the pressure of a selected gas to approximately ambient atmospheric pressure for mixing with air at ambient atmospheric pressure. The gas mixing apparatus includes a piston disposed within a pump chamber. A flow limiting inlet controls introduction of a first selected gas such as oxygen for mixing with a second selected gas such as air. The pressure of the first selected gas is limited to an acceptable maximum pressure, so that even if a valve for admitting the first selected gas for mixing at ambient pressure fails, breathing gas will not be provided at an excessive pressure. A demand valve is alternatively provided for reducing the pressure of the first selected gas supplied before mixing, but a pressure sensor is also provided downstream of the demand valve for detecting failure of the demand valve, to shut off the supply of the first selected gas to prevent overpressurization.

US Patent:

6985833, Jan 10, 2006

Filed:

Jun 21, 2002

Appl. No.:

10/177708

Inventors:

John R. Shambroom - Arlington MA, US
Charles P. Smith - Medway MA, US
Hongmei Cai - Northboro MA, US
Edwin Merrick - Stow MA, US

Assignee:

Aspect Medical Systems, Inc. - Newton MA

International Classification:

G08B 1/08

US Classification:

702191

Abstract:

A system and method of identifying and removing artifact from radio frequency noise from biopotentials identifies epochs contaminated with radio frequency noise. Contaminated epochs are then replaced with recent uncontaminated epochs stored in a buffer, depending on the current level of artifact and the availability of suitable data. Discontinuities arising at the beginning of the replaced epochs are smoothed by means of a windowing function.

US Patent:

7230687, Jun 12, 2007

Filed:

Sep 2, 2005

Appl. No.:

11/217391

Inventors:

John J. O'Mahony - Barna, IE
Edwin B. Merrick - Stow MA, US
Sonny Behan - Sugar Hill GA, US

Assignee:

CHF Solutions Inc. - Brooklyn Park MN

International Classification:

G01J 1/42
A61B 5/00
B01D 35/18

US Classification:

356 39, 356410, 600322, 600336, 210 962, 250343

Abstract:

A blood leak detector is disclosed having a light source projecting a beam along an optical path, wherein the beam has a wavelength in a range of about 800 to 930 nm; a light detector receiving the beam through an aperture having a diameter in a range of 30 to 60 thousands of an inch; and a housing to receive a tubular liquid passage between the light source and light detector, the housing having a slot transverse to the optical path to receive the tubular liquid passage and the slot has a width narrower than the tubular liquid passage when uncompressed.

US Patent:

7647834, Jan 19, 2010

Filed:

Aug 1, 2005

Appl. No.:

11/193423

Inventors:

John J. O'Mahony - Barna, IE
Mark Gelfand - New York NY, US
Edwin B. Merrick - Stow MA, US

Assignee:

CHF Solutions Inc. - Brooklyn Park MN

International Classification:

G01L 9/00

US Classification:

73754, 600 501

Abstract:

A system is disclosed for detecting an electrical sensor, the system includes a sensor signal processing circuit further comprising an input port to receive a connector including the output signal lines of the sensor, a resistor connected to the output signal line of said input port, wherein the resistor is connected to a predetermined voltage; a sensor circuit having a connector adapted to connect to the connector, wherein the sensor circuit has a resistance substantially less than the pull-resistor, and the sensor signal processing circuit detects an unconnected sensor based on the voltage applied by the resistor.

US Patent:

7671974, Mar 2, 2010

Filed:

Oct 29, 2004

Appl. No.:

10/975411

Inventors:

John J. O'Mahony - Barna, IE
Xinrui Hou - Minneapolis MN, US
Edwin B. Merrick - Stow MA, US

Assignee:

CHF Solutions Inc. - Brooklyn Park MN

International Classification:

G01N 33/48
G01N 21/05

US Classification:

356 39, 356246, 356436

Abstract:

A optical sensor for measuring tranmissive properties of a solution having: a cuvette body with an enclosed flow passage for the solution, wherein the flow passage further includes a solution inlet and a solution outlet and a cuvette between the inlet and outlet; a light source projecting light of a predetermined wavelength through the cuvette and solution flowing through the cuvette and to a light sensor, wherein the cuvette has inner wall surfaces opaque to the light of said predetermined wavelength, and the inner wall is in contact with the solution.

US Patent:

7886611, Feb 15, 2011

Filed:

Jan 15, 2010

Appl. No.:

12/688161

Inventors:

John J. O'Mahony - Maple Grove MN, US
Mark Gelfand - New York NY, US
Edwin B. Merrick - Stow MA, US

Assignee:

CHF Solutions Inc. - Brooklyn Park MN

International Classification:

G01L 7/00

US Classification:

73756, 363 50, 324537

Abstract:

A system is disclosed for detecting an electrical sensor, the system includes a sensor signal processing circuit further comprising an input port to receive a connector including the output signal lines of the sensor, a resistor connected to the output signal line of said input port, wherein the resistor is connected to a predetermined voltage; a sensor circuit having a connector adapted to connect to the connector, wherein the sensor circuit has a resistance substantially less than the pull-resistor, and the sensor signal processing circuit detects an unconnected sensor based on the voltage applied by the resistor.

US Patent:

20030210390, Nov 13, 2003

Filed:

Feb 19, 2003

Appl. No.:

10/367875

Inventors:

John O'Mahony - Minnetonka MN, US
Edwin Merrick - Stow MA, US
Sonny Behan - Sugar Hill GA, US

International Classification:

G01J001/42

US Classification:

356/218000

Abstract:

A blood leak detector is disclosed having a light source projecting a beam along an optical path, wherein the beam has a wavelength in a range of about 800 nm to 930 nm; a light detector receiving the beam; a housing with a slot to receive a transparent tube between the light source and light detector and aligned with the optical path.

US Patent:

46023224, Jul 22, 1986

Filed:

Jun 18, 1984

Appl. No.:

6/621401

Inventors:

Edwin B. Merrick - Stow MA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

H02M 7217

US Classification:

363127

Abstract:

A power supply for producing DC voltage with a minimum voltage drop from a source voltage that is either AC or DC in which the emitter-base junction of a transistor is coupled to the source so as to provide base current required to turn the transistor on, an output capacitor is connected in series with the emitter-collector path, and a capacitor and resistor are connected in parallel in the base circuit of the transistor.