Patents Assigned to Medwaves, Inc.
  • Patent number: 9326819
    Abstract: An ablation system which transmits radio frequency (RF) energy for the ablation of biological tissues has a transmission line and an RF antenna disposed at the distal portion of the transmission line. An RF signal generator supplies RF energy to the proximal end of the cable for transmission to the antenna, and an electrically tunable transformer is connected between the signal generator and the antenna. The transformer is tuned based on detection of the reflected power level from the antenna so as to reduce or minimize reflected power, thereby increasing RF energy coupling between the antenna and tissue.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: May 3, 2016
    Assignee: Medwaves, Inc.
    Inventors: Theodore C. Ormsby, Russell Chung, George Leung, Gwo Jenn Shen
  • Patent number: 9039698
    Abstract: An RF ablation system has a hollow conductive coaxial cable comprising inner and outer coaxial tubular conductors, and an ablating member mounted at the distal end portion of the cable for delivery of radio frequency energy including microwaves to the target body tissue. The inner conductor has a central lumen and extends at least up to the ablating member. At least one electromagnetic tracking sensor coil with a magnetic core is located in the central lumen at the distal end portion of the cable, close to the distal tip of the cable, and connected to a signal processing unit. An electromagnetic field generator positioned in the vicinity of a patient undergoing treatment generates an electromagnetic field which induces a voltage in the sensor coil. The signal processing unit uses the induced voltage to calculate the position and orientation of the distal end portion or tip of the catheter in a patient's body.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: May 26, 2015
    Assignee: Medwaves, Inc.
    Inventors: Theodore C. Ormsby, Shen Gwo Jenn, George L. Leung
  • Patent number: 8934989
    Abstract: An ablation device which transmits radio frequency (RF) energy for the ablation of biological tissues has elongate inner and outer coaxial conductors extending from a proximal portion to a distal portion. An RF antenna is disposed at the distal portion of the device and transmits RF energy for ablation of a tissue region to be treated. Reflection of energy from the tissue or the ablation point is reduced by providing multiple layers of dielectric media about the antenna, or by providing a gradual transition point from the conductors to the antenna tip, by means of a longitudinally stepped dielectric layer transformer.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: January 13, 2015
    Assignee: MedWaves, Inc.
    Inventors: Theodore C. Ormsby, Russell Chung, George Leung, Gwo Jenn Shen
  • Patent number: 8679106
    Abstract: A coaxial cable apparatus which transmits radio frequency (RF) energy for the ablation of biological tissues has inner and outer coaxial conductors extending substantially the entire length of the cable from a proximal end portion to a distal end portion. An RF antenna is disposed at the distal end portion of the cable and transmits RF energy for ablation of a tissue region to be treated. An angioplasty balloon is disposed over the RF antenna and communicates with a fluid supply and extraction passageway extending through the cable to allow the balloon to be inflated for an angioplasty procedure including tissue ablation, and to be deflated after the procedure is complete.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: March 25, 2014
    Assignee: Medwaves, Inc.
    Inventors: Theodore C. Ormsby, George Leung, Gwo Jenn Shen
  • Patent number: 8308722
    Abstract: A hollow coaxial cable adapted for conduction of radio frequency (RF) energy, particularly microwave energy, has a proximal end and a distal end and comprises coaxial inner and outer conductors extending substantially the entire length of the cable from the proximal end to a distal end portion of the cable with a dielectric medium disposed between the inner and outer conductors. The inner conductor comprises an elongated electrically conductive tubular member having a hollow, axially extending lumen, and the outer conductor comprises an elongated electrically conductive tubular member disposed in a substantially coaxial relationship over at least a portion of the inner conductor. An ablating member which delivers radio frequency energy, particularly microwave energy, to body tissue is disposed at a distal end portion of the cable.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: November 13, 2012
    Assignee: MedWaves, Inc.
    Inventors: Theodore C. Ormsby, George L. Leung, Gwo Jenn Shen, Peter Chu, Ming Fan Law
  • Patent number: 8152799
    Abstract: A RF catheter system includes a catheter with a proximal portion, a distal portion having a distal end and a lumen extending from the proximal portion to the distal portion. Inner and outer coaxially aligned conductors extend within the catheter and are coaxial with the lumen. A deflectable catheter guide is disposed within the catheter lumen and extends proximally within the catheter lumen and terminates distally of the distal end of the catheter to define a biological ablation pathway. A radio-frequency antenna is disposed at the distal portion of the catheter and is in electrical communication with the inner and outer coaxially aligned conductors. The radio-frequency antenna is adaptable to receive and transmit radio-frequency energy for ablating biological tissue along the ablation pathway.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: April 10, 2012
    Assignee: Medwaves, Inc.
    Inventors: Theodore C. Ormsby, Ming-Fan Law, George L. Leung
  • Patent number: 8133222
    Abstract: A coaxial cable apparatus which transmits radio frequency (RF) energy for the ablation of biological tissues has inner and outer coaxial conductors extending from a proximal portion to a distal portion. An RF antenna is disposed at the distal portion of the cable and transmits RF energy for ablation of a tissue region to be treated. At least one ultrasonic transducer is also disposed at the distal portion of the cable to direct ultrasonic frequency energy to a tissue region. The ultrasonic transducer detects reflected ultrasonic signals from the tissue region and provides a signal output which varies dependent on the density of tissue over the monitored tissue region. The reflected ultrasonic signal can be monitored before, during, and after ablation treatment.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: March 13, 2012
    Assignee: Medwaves, Inc.
    Inventor: Theodore C. Ormsby
  • Publication number: 20110130750
    Abstract: An RF ablation system has a hollow conductive coaxial cable comprising inner and outer coaxial tubular conductors, and an ablating member mounted at the distal end portion of the cable for delivery of radio frequency energy including microwaves to the target body tissue. The inner conductor has a central lumen and extends at least up to the ablating member. At least one electromagnetic tracking sensor coil with a magnetic core is located in the central lumen at the distal end portion of the cable, close to the distal tip of the cable, and connected to a signal processing unit. An electromagnetic field generator positioned in the vicinity of a patient undergoing treatment generates an electromagnetic field which induces a voltage in the sensor coil. The signal processing unit uses the induced voltage to calculate the position and orientation of the distal end portion or tip of the catheter in a patient's body.
    Type: Application
    Filed: November 24, 2010
    Publication date: June 2, 2011
    Applicant: MEDWAVES, INC.
    Inventors: Theodore C. Ormsby, Shen Gwo Jenn, George L. Leung
  • Publication number: 20110009858
    Abstract: A RF catheter system includes a catheter with a proximal portion, a distal portion having a distal end and a lumen extending from the proximal portion to the distal portion. Inner and outer coaxially aligned conductors extend within the catheter and are coaxial with the lumen. A deflectable catheter guide is disposed within the catheter lumen and extends proximally within the catheter lumen and terminates distally of the distal end of the catheter to define a biological ablation pathway. A radio-frequency antenna is disposed at the distal portion of the catheter and is in electrical communication with the inner and outer coaxially aligned conductors. The radio-frequency antenna is adaptable to receive and transmit radio-frequency energy for ablating biological tissue along the ablation pathway.
    Type: Application
    Filed: September 8, 2010
    Publication date: January 13, 2011
    Applicant: MEDWAVES, INC.
    Inventors: Theodore C. Ormsby, Ming-Fan Law, George L. Leung
  • Publication number: 20100268218
    Abstract: An ablation system which transmits radio frequency (RF) energy for the ablation of biological tissues has a transmission line and an RF antenna disposed at the distal portion of the transmission line. An RF signal generator supplies RF energy to the proximal end of the cable for transmission to the antenna, and an electrically tunable transformer is connected between the signal generator and the antenna. The transformer is tuned based on detection of the reflected power level from the antenna so as to reduce or minimize reflected power, thereby increasing RF energy coupling between the antenna and tissue.
    Type: Application
    Filed: April 15, 2009
    Publication date: October 21, 2010
    Applicant: MedWaves, Inc.
    Inventors: Theodore C. Ormsby, Russell Chung, George Leung, Gwo Jenn Shen
  • Publication number: 20100268219
    Abstract: An ablation device which transmits radio frequency (RF) energy for the ablation of biological tissues has elongate inner and outer coaxial conductors extending from a proximal portion to a distal portion. An RF antenna is disposed at the distal portion of the device and transmits RF energy for ablation of a tissue region to be treated. Reflection of energy from the tissue or the ablation point is reduced by providing multiple layers of dielectric media about the antenna, or by providing a gradual transition point from the conductors to the antenna tip, by means of a longitudinally stepped dielectric layer transformer.
    Type: Application
    Filed: April 15, 2009
    Publication date: October 21, 2010
    Applicant: MEDWAVES, INC.
    Inventors: Theodore C. Ormsby, Russell Chung, George Leung, Gwo Jenn Shen
  • Publication number: 20100004650
    Abstract: A coaxial cable apparatus which transmits radio frequency (RF) energy for the ablation of biological tissues has inner and outer coaxial conductors extending substantially the entire length of the cable from a proximal end portion to a distal end portion. An RF antenna is disposed at the distal end portion of the cable and transmits RF energy for ablation of a tissue region to be treated. An angioplasty balloon is disposed over the RF antenna and communicates with a fluid supply and extraction passageway extending through the cable to allow the balloon to be inflated for an angioplasty procedure including tissue ablation, and to be deflated after the procedure is complete.
    Type: Application
    Filed: July 1, 2008
    Publication date: January 7, 2010
    Applicant: MEDWAVES, INC.
    Inventors: Theodore C. Ormsby, George Leung, Gwo Jenn Shen
  • Publication number: 20090299360
    Abstract: A coaxial cable apparatus which transmits radio frequency (RF) energy for the ablation of biological tissues has inner and outer coaxial conductors extending from a proximal portion to a distal portion. An RF antenna is disposed at the distal portion of the cable and transmits RF energy for ablation of a tissue region to be treated. At least one ultrasonic transducer is also disposed at the distal portion of the cable to direct ultrasonic frequency energy to a tissue region. The ultrasonic transducer detects reflected ultrasonic signals from the tissue region and provides a signal output which varies dependent on the density of tissue over the monitored tissue region. The reflected ultrasonic signal can be monitored before, during, and after ablation treatment.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 3, 2009
    Applicant: MedWaves, Inc.
    Inventor: Theodore C. Ormsby
  • Patent number: 7594913
    Abstract: A radio-frequency based catheter system and method for ablating biological tissues within the body vessel of a patient comprises a radio-frequency (“RF”) generator for selectively generating a high frequency RF energy signal in a deployable catheter having an RF transmission line, an RF antenna mounted on the distal portion of the catheter, and a temperature sensor also mounted on a distal portion of the catheter for detecting temperature adjacent an ablation site. A control system adjusts the RF energy signal so that the detected temperature is at or close to a selected temperature setting or within a selected temperature range.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: September 29, 2009
    Assignee: Medwaves, Inc.
    Inventors: Theodore C. Ormsby, George L. Leung, Gwo Jenn Shen, Peter Chu, Ming Fan Law
  • Patent number: 7137954
    Abstract: A sensor interface assembly is used with a blood pressure measurement device to determine blood pressure of an underlying artery. The sensor interface assembly includes a base unit, a sensing unit and means for detachably connecting the sensing unit to the base unit. The base unit is pivotally attached to the blood pressure measurement device. The sensing unit includes sensing means for sensing blood pressure of each pulse as each pulse travels beneath the sensing means. The means for detachably connecting mechanically and electrically couple the sensing unit to the base unit.
    Type: Grant
    Filed: September 10, 2003
    Date of Patent: November 21, 2006
    Assignee: Medwave, Inc.
    Inventors: Roger C. Thede, Kevin R. Evans
  • Patent number: 7070595
    Abstract: A method for biological tissue ablation includes shaping a shapeable RF antenna to accommodate the contour of a body vessel adjacent a biological tissue load; generating a train of radio frequency (RF) energy pulses at an output frequency for transmission in a transmission line to the shapeable RF antenna adjacent the biological tissue load; sensing a reflected signal and a forward signal of the RF energy pulses; and adjusting output frequency of the RF energy pulses to effect a substantial match of transmission line impedance with shapeable RF antenna and biological tissue load impedance.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: July 4, 2006
    Assignee: Medwaves, Inc.
    Inventors: Theodore C. Ormsby, Ming-Fan Law, George L. Leung
  • Patent number: 7052465
    Abstract: The noninvasive measurement of a patient's blood pressure is achieved automatically in high motion situations by using a dual signal channel pressure sensor in a method and system that acquires pressure waveform data while the degree of compression of an artery is being varied. Two pressure measurement channels are used, one being a main channel for monitoring pressure in the pressure transmission path, and the other being a reference channel for monitoring pressure in a wall through which a holddown force is applied. A caregiver applies the NIBP sensor to the patient. Immediately before the patient is about to engage in high motion activities or be placed in a high motion environment, the caregiver turns ON the automatic HMT function, and proceeds with his or her duties while observing the patient to ensure that the patient is quiet until the NIBP monitor acquires a certain number of waveforms without resetting. Once this has occurred, the caregiver may permit the high motion activity to begin.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: May 30, 2006
    Assignee: Medwave, Inc.
    Inventors: Donna R. Lunak, Robert S. Bryngelson
  • Patent number: 7004938
    Abstract: A RF catheter system includes a catheter with a proximal portion, a distal portion having a distal end and a lumen extending from the proximal portion to the distal portion. Inner and outer coaxially aligned conductors extend within the catheter and are coaxial with the lumen. A deflectable catheter guide is disposed within the catheter lumen and extends proximally within the catheter lumen and terminates distally of the distal end of the catheter to define a biological ablation pathway. A radio-frequency antenna is disposed at the distal portion of the catheter and is in electrical communication with the inner and outer coaxially aligned conductors. The radio-frequency antenna is adaptable to receive and transmit radio-frequency energy for ablating biological tissue along the ablation pathway.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: February 28, 2006
    Assignee: MedWaves, Inc.
    Inventors: Theodore C. Ormsby, Ming-Fan Law, George L. Leung
  • Patent number: 6986741
    Abstract: A method and apparatus for determining cardiac time intervals that can measure physiological data noninvasively. Arterial pulse values are measured either invasively or noninvasively, from which left ventricular waveform data is generated. Systolic and diastolic time intervals are derived based on the left ventricular waveform data.
    Type: Grant
    Filed: April 8, 2003
    Date of Patent: January 17, 2006
    Assignee: Medwave, Inc.
    Inventors: Marius O. Poliac, Liviu C. Poliac, Timothy J. O'Malley
  • Patent number: 6941953
    Abstract: A preformed catheter set for production of linear ablation lines in the left and right atrium for treatment of atrial fibrillation includes at least a first catheter including a pre-shaped distal segment having a distal linear ablation antenna and a U-shaped curve portion proximal to the distal linear ablation antenna.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: September 13, 2005
    Assignee: Medwaves, Inc.
    Inventors: Gregory K. Feld, Theodore C. Ormsby, Ming-Fan Law, George L. Leung