Patents by Inventor James A. McEwen

James A. McEwen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11219464
    Abstract: A low-cost contour cuff for surgical tourniquet systems comprises: a sheath containing an inflatable bladder, the sheath having an arcuate shape, an outer surface and a centerline equidistant between first and second side edges; a securing strap non-releasably attached to the outer surface and formed of substantially inextensible material having a shape that is predetermined and substantially flat, wherein the strap includes a bending portion near a first strap end and a fastening portion near a second strap end, and wherein the bending portion is adapted to allow twisting of the bending portion out of the substantially flat shape to facilitate positioning of the fastening portion into any of a plurality of positions in the substantially flat shape; and fastening means for releasably attaching the fastening portion of the securing strap to the outer surface whenever the sheath is curved into a position for surrounding a limb.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: January 11, 2022
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Kenneth L. Glinz, Tom Yu Chia Lai
  • Patent number: 10646231
    Abstract: An apparatus for intermittent vascular occlusion based on a personalized tourniquet pressure (PTP) includes a dual-purpose tourniquet cuff having an inflatable bladder, a sensor module having a pulsation sensor communicating pneumatically with the inflatable bladder for sensing and characterizing pressure pulsations indicative of a distal occlusion pressure (DOP) to identify a minimum pressure at which penetration of blood past the cuff is stopped, a PTP estimator responsive to the pulsation sensor for producing an estimate of a PTP, wherein the estimate of the PTP is a function of the DOP, an effector module communicating pneumatically with the inflatable bladder for maintaining pressure in the bladder near the PTP during a first time period and for maintaining pressure in the bladder near a second level of pressure during a second time period, and a controller selectively operating the inflatable bladder in conjunction with the sensor module and the effector module.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: May 12, 2020
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Patent number: 10646232
    Abstract: Disclosed is a system and method for regulating tourniquet cuff pressure to restrict blood flow penetration past the cuff based on a personalized restrictive pressure (PRP). The system includes mechanisms for estimating a limb occlusion pressure (LOP) by determining a minimum pressure at which arterial blood penetration past an applied tourniquet cuff is stopped and measuring a pulsation characteristic associated with the LOP. Thereafter, the system establishes a PRP by determining a second pressure that restricts but does not stop arterial blood penetration past the cuff and that corresponds to a second pulsation characteristic differing by a percentage from the pulsation characteristic associated with the LOP. During a limb-activity time period, the system maintains pressure in the applied tourniquet cuff near the PRP, thereby restricting but not stopping arterial blood penetration past the cuff during the activity time period.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: May 12, 2020
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Publication number: 20180193029
    Abstract: An apparatus for intermittent vascular occlusion based on a personalized tourniquet pressure (PTP) includes a dual-purpose tourniquet cuff having an inflatable bladder, a sensor module having a pulsation sensor communicating pneumatically with the inflatable bladder for sensing and characterizing pressure pulsations indicative of a distal occlusion pressure (DOP) to identify a minimum pressure at which penetration of blood past the cuff is stopped, a PTP estimator responsive to the pulsation sensor for producing an estimate of a PTP, wherein the estimate of the PTP is a function of the DOP, an effector module communicating pneumatically with the inflatable bladder for maintaining pressure in the bladder near the PTP during a first time period and for maintaining pressure in the bladder near a second level of pressure during a second time period, and a controller selectively operating the inflatable bladder in conjunction with the sensor module and the effector module.
    Type: Application
    Filed: March 5, 2018
    Publication date: July 12, 2018
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Publication number: 20180140306
    Abstract: A low-cost contour cuff for surgical tourniquet systems comprises: a sheath containing an inflatable bladder, the sheath having an arcuate shape, an outer surface and a centerline equidistant between first and second side edges; a securing strap non-releasably attached to the outer surface and formed of substantially inextensible material having a shape that is predetermined and substantially flat, wherein the strap includes a bending portion near a first strap end and a fastening portion near a second strap end, and wherein the bending portion is adapted to allow twisting of the bending portion out of the substantially flat shape to facilitate positioning of the fastening portion into any of a plurality of positions in the substantially flat shape; and fastening means for releasably attaching the fastening portion of the securing strap to the outer surface whenever the sheath is curved into a position for surrounding a limb.
    Type: Application
    Filed: January 2, 2018
    Publication date: May 24, 2018
    Applicant: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Kenneth L. Glinz, Tom Yu Chia Lai
  • Publication number: 20180116679
    Abstract: A low-cost contour cuff for surgical tourniquet systems comprises: a sheath containing an inflatable bladder, the sheath having an arcuate shape, an outer surface and a centerline equidistant between first and second side edges; a securing strap non-releasably attached to the outer surface and formed of substantially inextensible material having a shape that is predetermined and substantially flat, wherein the strap includes a bending portion near a first strap end and a fastening portion near a second strap end, and wherein the bending portion is adapted to allow twisting of the bending portion out of the substantially flat shape to facilitate positioning of the fastening portion into any of a plurality of positions in the substantially flat shape; and fastening means for releasably attaching the fastening portion of the securing strap to the outer surface whenever the sheath is curved into a position for surrounding a limb.
    Type: Application
    Filed: December 22, 2017
    Publication date: May 3, 2018
    Applicant: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Kenneth L. Glinz, Tom Yu Chia Lai
  • Patent number: 9931126
    Abstract: Disclosed are methods and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of surgical and medical procedures. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient to provide both a sensor during a first time period and an effector during a second time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the second time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the first time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of a patient encircled by the cuff.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: April 3, 2018
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Patent number: 9903267
    Abstract: A turbocharger system comprises a first relatively small turbocharger and a second relatively large turbocharger connected in series and an exhaust gas flow control valve. The exhaust control valve has an inlet port communicating with the exhaust gas flow upstream of the first turbine a first outlet port communicating with the exhaust flow downstream of said first turbine but upstream of said second turbine, and a second outlet port communicating with the exhaust flow downstream of said second turbine. The valve is operable to selectively permit or block flow through the first and second outlet ports.
    Type: Grant
    Filed: April 13, 2015
    Date of Patent: February 27, 2018
    Assignee: Cummins Turbo Technologies Limited
    Inventors: Lee J. Robinson, James A. McEwen
  • Patent number: 9814467
    Abstract: Disclosed is a method and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of a surgical procedure. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient limb to provide both a sensor during a pre-surgical time period and an effector during a surgical time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the surgical time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the pre-surgical time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of the limb encircled by the cuff.
    Type: Grant
    Filed: April 25, 2015
    Date of Patent: November 14, 2017
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Publication number: 20170112504
    Abstract: Disclosed is a system and method for regulating tourniquet cuff pressure to restrict blood flow penetration past the cuff based on a personalized restrictive pressure (PRP). The system includes mechanisms for estimating a limb occlusion pressure (LOP) by determining a minimum pressure at which arterial blood penetration past an applied tourniquet cuff is stopped and measuring a pulsation characteristic associated with the LOP. Thereafter, the system establishes a PRP by determining a second pressure that restricts but does not stop arterial blood penetration past the cuff and that corresponds to a second pulsation characteristic differing by a percentage from the pulsation characteristic associated with the LOP. During a limb-activity time period, the system maintains pressure in the applied tourniquet cuff near the PRP, thereby restricting but not stopping arterial blood penetration past the cuff during the activity time period.
    Type: Application
    Filed: May 20, 2015
    Publication date: April 27, 2017
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Patent number: 9480481
    Abstract: A tourniquet cuff includes a first sheet, a second sheet, and a seal joining the first sheet and second sheet to form an inflatable bladder. A securing strap is attached to the cuff. The cuff encircles the limb so that the bladder overlaps upon itself. A stiffener fits inside the bladder and sized to extend substantially the length of the bladder but not the entire bladder length, and to fit completely within the seal. A tubular port is connected to the bladder for directing gas into the bladder from a tourniquet instrument to which the port may be releasably connected, and a cuff marking weld is located on an outer surface of the cuff, having a shape selected to form a symbol or indicia that is visible to a user.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: November 1, 2016
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Kenneth L. Glinz, Allen J. Upward
  • Patent number: 9301701
    Abstract: Improved tourniquet apparatus for measuring a patient's limb occlusion pressure includes an inflatable tourniquet cuff for encircling a limb at a location and to which a tourniquet instrument is releasably connectable.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: April 5, 2016
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, William K. W. Cheung, Michael A. Gebert
  • Publication number: 20160008005
    Abstract: Disclosed is a method and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of a surgical procedure. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient limb to provide both a sensor during a pre-surgical time period and an effector during a surgical time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the surgical time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the pre-surgical time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of the limb encircled by the cuff.
    Type: Application
    Filed: April 25, 2015
    Publication date: January 14, 2016
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Publication number: 20160008006
    Abstract: Disclosed are methods and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of surgical and medical procedures. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient to provide both a sensor during a first time period and an effector during a second time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the second time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the first time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of a patient encircled by the cuff.
    Type: Application
    Filed: August 27, 2015
    Publication date: January 14, 2016
    Applicant: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Publication number: 20150322856
    Abstract: A turbocharger system comprises a first relatively small turbocharger and a second relatively large turbocharger connected in series and an exhaust gas flow control valve. The exhaust control valve has an inlet port communicating with the exhaust gas flow upstream of the first turbine a first outlet port communicating with the exhaust flow downstream of said first turbine but upstream of said second turbine, and a second outlet port communicating with the exhaust flow downstream of said second turbine. The valve is operable to selectively permit or block flow through the first and second outlet ports.
    Type: Application
    Filed: April 13, 2015
    Publication date: November 12, 2015
    Inventors: Lee J. Robinson, James A. McEwen
  • Patent number: 9138236
    Abstract: A tourniquet hazard suppressor suppresses an action initiated by a user of a surgical tourniquet system having a touchscreen user interface if implementation of that action by the system may be hazardous to a surgical patient.
    Type: Grant
    Filed: July 4, 2011
    Date of Patent: September 22, 2015
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson
  • Patent number: 9113895
    Abstract: An integrated tourniquet system enables the user to establish with suitable warnings, and with timely user confirmation, individualized maximum pressure levels in the cuff that may be above normal maximum pressure levels. Also provided is a rapid and accurate method of testing for leakage in the cuff and connectors. The system is adapted for communication to remote devices for receiving and providing information relating to the pressure levels, tests, etc.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: August 25, 2015
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Michael A. Gebert, William K. W. Cheung
  • Patent number: 9050096
    Abstract: A tourniquet cuff has minimal flow restrictions within its pneumatic passageway under normal operating conditions, has a substantially reduced likelihood of partial or complete obstructions or interruptions of the pneumatic passageway under foreseeable operating conditions, can indicate exposure of the cuff to external agents that are capable of affecting the integrity of the pneumatic passageway before use, and can be manufactured economically.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: June 9, 2015
    Assignee: Western Clinical Engineering, Ltd.
    Inventors: James A. McEwen, Kenneth Glinz, Kevin B. Inkpen, Michael Jameson
  • Patent number: RE47128
    Abstract: Provided are improved agricultural processes for the improved cultivation of rice wherein the crops are treated to control undesired vegetative growth using a plant treatment composition comprising both halosulfuron and thifensulfuron to provide improved herbicidal efficacy against Heteranthera limosa, commonly referred to as “duck salad”. Also provided are compositions useful in the improved agricultural processes, as well as herbicidal treatment regimens. Unexpectedly high rates of efficacy against Heteranthera limosa, amongst rice plant in rice crops are disclosed.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: November 20, 2018
    Assignee: Canyon Group LLC
    Inventors: Eric Paige Webster, Dominic Frank Alonso, Sergio Comparini, Wallace Keith Majure, Sandra Alcaraz, Charles Paul Grasso, Eric James McEwen, Tak Wai Cheung
  • Patent number: D847344
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: April 30, 2019
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson, Kenneth L. Glinz, Jeswin Jeyasurya, Tom Yu Chia Lai