Patents Assigned to Western Clinical Engineering Ltd.
  • 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: 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
  • 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: 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
  • 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: 9039730
    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: July 10, 2014
    Date of Patent: May 26, 2015
    Assignee: Western Clinical Engineering, Ltd.
    Inventors: James A. McEwen, Michael Jameson, Jeswin Jeyasurya, Kenneth L. Glinz
  • Patent number: 9011483
    Abstract: A surgical tourniquet cuff that includes a stabilizer component that facilitates application of an overlapping cuff around the limb of a patient. The stabilizer is fixed to the cuff, and requires no tying or similar user manipulation to secure the overlapping cuff in alignment with the underlying cuff. The stabilizer improves the stability of the inflated cuff to prevent sideways shifting motion of overlapping cuff portions as the cuff is applied to the limb. The stabilizer also provides a handle mechanism to enable the user to snugly apply the overlapping cuff around the patient's limb while the overlapping portions remain properly aligned along their long axes. The stabilizer is designed to also facilitate attaching together two tourniquet cuffs end-to-end, with respective bladders overlapping and in proper alignment so that those attached cuffs can be used as a single, extended surgical cuff applied around a patient's limb.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: April 21, 2015
    Assignee: Western Clinical Engineering, Ltd.
    Inventors: James A. McEwen, Michael Jameson, Kenneth L. Glinz
  • Patent number: 8758390
    Abstract: Tourniquet effector system estimates and indicates the pressure gradients produced on the surface of the body by an effector, thereby allowing the pressure gradients to be minimized. The system also detects and monitors blood flow beneath the effector, thereby allowing the pressure applied by the effector to be regulated near the minimum necessary to stop blood flow past the effector.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: June 24, 2014
    Assignee: Western Clinical Engineering, Ltd.
    Inventors: James A. McEwen, Michael Jameson, Michael A. Gebert
  • Patent number: 8721678
    Abstract: A surgical tourniquet cuff system includes a tourniquet cuff with a cuff connector for communicating pneumatically with the cuff and for releasably connecting to a tourniquet instrument connector to establish a pneumatic passageway between the cuff connector and the tourniquet instrument connector. A tourniquet instrument supplies pressurized gas through the pneumatic passageway to the cuff. The tourniquet instrument connector includes a cuff pressure transducer for producing a cuff pressure signal indicative of the pressure of gas within the gas passageway near the connection. The cuff may include a cuff usage register for containing a cuff usage record and the tourniquet instrument connector may include a cuff usage register interface for reading the record. The tourniquet cuff may further include a cuff sheath forming a flexible conduit containing the cuff connector and sized to allow the connection of the cuff connector to the tourniquet instrument connector within the sheath.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: May 13, 2014
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Michael Jameson
  • Publication number: 20140025101
    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: Application
    Filed: September 25, 2013
    Publication date: January 23, 2014
    Applicant: WESTERN CLINICAL ENGINEERING LTD.
    Inventors: James A. McEwen, Kenneth Glinz, Kevin B. Inkpen, Michael Jameson
  • Patent number: 8568441
    Abstract: Disclosed are methods of manufacturing and inflating an elongated bladder of a tourniquet cuff that may be secured around the limb of a patient. The method includes sealing together side edges of layers of material to form the bladder, and stiffening the cuff with a stiffener for compressing the portion of the bladder underlying the stiffener inwardly toward the limb while preventing two layers of the cuff from contacting each other at a location adjacent to an edge of the cuff to thus provide a continuous pneumatic passageway in the bladder between the overlying stiffener and the sealed edge for distributing inflating gas through the passageway along the length of the bladder.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: October 29, 2013
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James A. McEwen, Kenneth Glinz, Kevin B. Inkpen, Michael Jameson
  • Publication number: 20130245673
    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: Application
    Filed: April 16, 2013
    Publication date: September 19, 2013
    Applicant: WESTERN CLINICAL ENGINEERING LTD.
    Inventors: James A. McEwen, Michael Jameson, Kenneth L. Glinz, Allen J. Allen
  • 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
  • Patent number: D850631
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: June 4, 2019
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James Allen McEwen, Michael Jameson, Tom Yu Chia Lai, Jane Dorothea Procyshyn, Joshua Jonathan Sam
  • Patent number: D861885
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: October 1, 2019
    Assignee: Western Clinical Engineering Ltd.
    Inventors: James Allen McEwen, Michael Jameson, Tom Yu Chia Lai, Jane Dorothea Procyshyn, Joshua Jonathan Sam