Patents by Inventor James Allen McEwen

James Allen 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).

  • Publication number: 20190117231
    Abstract: A sleeve for use with a tourniquet cuff to protect a patient's limb from tourniquet-related injury includes a stretchable body extending longitudinally over a sleeve length between a proximal end and a distal end. The body has a tubular shape, and the sleeve length is greater than a width of the tourniquet cuff. The body tapers from the proximal end to the distal end such that a proximal end circumference is greater than a distal end circumference. The body is formed to apply substantially uniform pressure to the patient's limb from the proximal end of the sleeve to the distal end of the sleeve varying only within a predetermined pressure range.
    Type: Application
    Filed: December 20, 2018
    Publication date: April 25, 2019
    Inventors: James Allen McEwen, Michael Jameson, Tom Yu Chia Lai
  • Patent number: 10201354
    Abstract: A sleeve for use with a tourniquet cuff to protect a patient's limb from tourniquet-related injury includes a stretchable body extending longitudinally over a sleeve length between a proximal end and a distal end. The body has a tubular shape, and the sleeve length is greater than a width of the tourniquet cuff. The body tapers from the proximal end to the distal end such that a proximal end circumference is greater than a distal end circumference. The body is formed to apply substantially uniform pressure to the patient's limb from the proximal end of the sleeve to the distal end of the sleeve varying only within a predetermined pressure range.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: February 12, 2019
    Assignee: Western Digital Engineering Ltd.
    Inventors: James Allen McEwen, Michael Jameson, Tom Yu Chia Lai
  • Patent number: 7384425
    Abstract: Apparatus is provided for protecting a patient's limb from tourniquet-related injury, comprising: a tourniquet cuff having a length sufficient for encircling a limb protection sleeve applied to a limb at a location having a limb circumference of not less than a predetermined minimum limb circumference and not more than a predetermined maximum limb circumference; limb protection sleeve adapted for applying to the limb at the location, wherein the sleeve has a tubular shape and a tubular circumference predetermined to be less than the predetermined minimum and wherein the sleeve is formed to allow elastic stretching of the tubular shape sufficient to increase the tubular circumference to be substantially equivalent to the limb circumference at the location when the sleeve is applied to the limb, thereby applying a pressure to the limb that is greater than a predetermined minimum pressure and less than a predetermined maximum pressure; and identification means perceptible to a user for providing an indication to
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: June 10, 2008
    Assignee: Western Clinical Eng. Ltd
    Inventor: James Allen McEwen
  • Patent number: 6746470
    Abstract: A pneumatic tourniquet adapted for self application by an injured person in a military or emergency situation to stop arterial blood loss in an injured arm or leg comprises: a bladder having a width dimension and having a length dimension greater than the circumference of an injured limb of a subject at a selected location; and clamp means for securing the bladder around the limb at the selected location and adapted for sealing the bladder across the bladder width to establish an inflatable portion of the bladder to be the portion of the bladder that encircles the injured limb at the selected location.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: June 8, 2004
    Inventors: James Allen McEwen, Kevin Bryant Inkpen, Kenneth L. Glinz, Michael Jameson
  • Patent number: 6736787
    Abstract: Apparatus for applying pressure to a patient's limb in order to augment venous blood flow in the limb and for monitoring the applied pressure, includes supplying a gas at a varying supply pressure to an inflatable sleeve that fits onto a limb to apply a varying pressure to the limb beneath the sleeve when inflated with the gas. A pressure transducer measures the pressure of gas in the inflatable sleeve and produces a sleeve pressure signal indicative of the estimated level of pressure. The apparatus measures the value of a predetermined pressure waveform parameter and produces a waveform parameter signal indicative of the measured value of the predetermined pressure waveform parameter.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: May 18, 2004
    Inventors: James Allen McEwen, Michael Jameson
  • Patent number: 6682547
    Abstract: A low cost tourniquet cuff with identification apparatus comprises: an outer strip; an inner strip positioned against the outer strip; a gas-tight seal joining the inner strip to the outer strip to form a cuff having a physical characteristic wherein the cuff includes an inflatable bladder of a predetermined length greater than the circumference of a limb at a selected location; and a cuff connector carried on the cuff and communicating pneumatically with the bladder for releasably connecting to a tourniquet instrument to establish a gas-tight passageway between the bladder and the instrument, wherein the cuff connector includes identification means indicative of the physical characteristic and detectable by the tourniquet instrument upon establishment of the gas-tight passageway.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: January 27, 2004
    Inventors: James Allen McEwen, Kevin Bryant Inkpen, Michael Jameson, Kenneth L. Glinz
  • Publication number: 20030139766
    Abstract: A pneumatic tourniquet adapted for self application by an injured person in a military or emergency situation to stop arterial blood loss in an injured arm or leg comprises: a bladder having a width dimension and having a length dimension greater than the circumference of an injured limb of a subject at a selected location; and clamp means for securing the bladder around the limb at the selected location and adapted for sealing the bladder across the bladder width to establish an inflatable portion of the bladder to be the portion of the bladder that encircles the injured limb at the selected location.
    Type: Application
    Filed: January 18, 2002
    Publication date: July 24, 2003
    Inventors: James Allen McEwen, Kevin Bryant Inkpen, Kenneth L. Glinz, Michael Jameson
  • Patent number: 6544202
    Abstract: An apparatus for applying an adaptable pressure waveform to a patient's limb to augment blood flow comprises: an inflatable sleeve for applying pressure to the limb; pressure transducer for producing a pressure signal; pressure waveform applicator responsive to the pressure signal and a reference pressure waveform signal for controlling a supply of fluid to the sleeve so that the pressure in the sleeve is maintained near a varying pressure indicated by the reference pressure waveform signal; and waveform register for producing the reference pressure waveform signal indicative of a reference pressure waveform that includes a maximum pressure at a time within a cycle time period and a rate of pressure increase leading to the maximum pressure and wherein the waveform register includes waveform adaptor for allowing the rate of pressure increase to change from a first rate to a second rate without changing the maximum pressure.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: April 8, 2003
    Inventors: James Allen McEwen, Michael Jameson
  • Publication number: 20030036771
    Abstract: A low cost tourniquet cuff with identification apparatus comprises: an outer strip; an inner strip positioned against the outer strip; a gas-tight seal joining the inner strip to the outer strip to form a cuff having a physical characteristic wherein the cuff includes an inflatable bladder of a predetermined length greater than the circumference of a limb at a selected location; and a cuff connector carried on the cuff and communicating pneumatically with the bladder for releasably connecting to a tourniquet instrument to establish a gas-tight passageway between the bladder and the instrument, wherein the cuff connector includes identification means indicative of the physical characteristic and detectable by the tourniquet instrument upon establishment of the gas-tight passageway.
    Type: Application
    Filed: August 14, 2001
    Publication date: February 20, 2003
    Inventors: James Allen McEwen, Kevin Bryant Inkpen, Michael Jameson, Kenneth L. Glinz
  • Patent number: 6440093
    Abstract: Apparatus for monitoring the application of a varying pressure to a limb from a sleeve positioned on the limb in order to augment the flow of venous blood and thus reduce the incidence of embolism and deep venous thrombosis in the limb. The apparatus includes a transducer for producing a sleeve pressure signal that is indicative of pressure applied by the sleeve to the limb. This signal is used for periodically measuring the value of a preselected pressure waveform parameter (such as maximum pressure produced in the sleeve). The microprocessor-controlled apparatus also generates an interval signal that is indicative of a time interval during which the value of the selected waveform parameter remains within a particular range.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: August 27, 2002
    Inventors: James Allen McEwen, Michael Jameson, Jonathan J. Nakane
  • Patent number: 6361548
    Abstract: Limb protection sleeve matches a specific tourniquet cuff for application to limbs having circumferences between minimum and a maximum circumference so that the sleeve, after application to a limb of minimum circumference, stretches elastically and so that the sleeve, after application to a limb of maximum circumference, applies a pressure to the limb that is less than a predetermined maximum pressure.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: March 26, 2002
    Inventor: James Allen McEwen
  • Publication number: 20010041910
    Abstract: Apparatus is provided for protecting a patient's limb from tourniquet-related injury, comprising: a tourniquet cuff having a length sufficient for encircling a limb protection sleeve applied to a limb at a location having a limb circumference of not less than a predetermined minimum limb circumference and not more than a predetermined maximum limb circumference; limb protection sleeve adapted for applying to the limb at the location, wherein the sleeve has a tubular shape and a tubular circumference predetermined to be less than the predetermined minimum and wherein the sleeve is formed to allow elastic stretching of the tubular shape sufficient to increase the tubular circumference to be substantially equivalent to the limb circumference at the location when the sleeve is applied to the limb, thereby applying a pressure to the limb that is greater than a predetermined minimum pressure and less than a predetermined maximum pressure; and identification means perceptible to a user for providing an indication to
    Type: Application
    Filed: June 21, 2001
    Publication date: November 15, 2001
    Inventor: James Allen McEwen
  • Patent number: 6213939
    Abstract: A hazard monitor for surgical tourniquet systems comprises: pressure transducing means for detecting a pressure in a pneumatic tourniquet cuff; power monitoring means for monitoring the supply of electricity to an electrically powered component of a tourniquet instrument, wherein the tourniquet instrument is connectable pneumatically to the tourniquet cuff to supply pressurized gas to the cuff, thereby producing a pressure in the cuff; and hazard detection means responsive to the pressure transducing means and the power monitoring means for producing an alarm if a pressure is detected in the tourniquet cuff when electricity is not supplied to the component.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: April 10, 2001
    Inventor: James Allen McEwen
  • Patent number: 6168569
    Abstract: Apparatus for relating pain and activity experienced by a patient comprises: pain transducing means for allowing a patient to select any one pain level from a predetermined number of pain levels and for producing a pain level signal indicative of the selected level; activity transducing means responsive to the pain level signal for measuring a level of a parameter of a physical activity of the patient near the time corresponding to the selection of the pain level and for producing an activity parameter level signal indicative of the measured level of the parameter; and relating means responsive to the pain level signal and the activity parameter level signal for characterizing the activity of the patient corresponding to the selected level of pain to be one activity level of a predetermined number of predefined activity levels and for producing a signal indicative of the characterized level of activity and the corresponding pain level.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: January 2, 2001
    Inventors: James Allen McEwen, Alexei John Marko, Michael Jameson
  • Patent number: 6080166
    Abstract: A dermatome for improved cutting of tissue comprises: a blade assembly, including a blade and a blade carrier; a rotational drive assembly; and a housing which engages the blade assembly to constrain the movement of any point on the blade assembly to bidirectional linear movement over a predefined linear range, wherein the engaged blade assembly forms a cover for the housing so that the housing in combination with the engaged blade assembly defines a closed space which surrounds the rotational drive assembly while the blade assembly moves over the predefined linear range. The entire blade assembly may be releasable from the housing, or the blade may be releasable from the blade carrier which remains non-releasably engaged with the housing.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: June 27, 2000
    Inventors: James Allen McEwen, Geoffrey Fletcher Auchinleck
  • Patent number: 5873881
    Abstract: The dermatome includes a blade assembly comprising a metal blade with fixedly attached thermoplastic carrier. The assembly is releasably mounted to the dermatome housing. A linear drive mechanism-that includes guide members and spring biasing of the blade assembly ensures linear, reciprocating blade movement that prolongs blade life. The linear drive mechanism is housed in a manner that facilitates cleaning and sterilization of the dermatome.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: February 23, 1999
    Inventors: James Allen McEwen, Geoffrey Fletcher Auchinleck
  • Patent number: 5843007
    Abstract: Apparatus for applying a pressure waveform to a patient's limb for augmenting venous blood flow in the limb comprises: a sleeve means adapted to position onto a limb and apply a pressure to the limb near a pressure corresponding to a sleeve pressure signal; pressure transducing means for producing an applied pressure signal indicative of the pressure applied to the limb by the sleeve means; waveform register means for producing a reference pressure waveform signal indicative of a reference pressure waveform during a predetermined cycle time period, wherein the amplitude of the reference pressure waveform signal at any instant within the cycle time period is indicative of the amplitude of the reference pressure waveform at the instant and wherein the shape of the reference pressure waveform during a predetermined time interval within the cycle time period is adapted to augment the flow of venous blood into the limb proximal to the sleeve means from the limb beneath the sleeve means during the interval; and pre
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: December 1, 1998
    Inventors: James Allen McEwen, Michael Jameson
  • 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