Patents Assigned to Irvine Biomedical Inc.
  • Patent number: 5891137
    Abstract: A catheter system having a tip with fixation means for use in treatment of tissues, such as ablating tumors in a natural body conduit or cavity by applying RF energy through the tip, wherein the catheter system passes through a natural body opening to reach the target tissue, wherein the catheter system stays at a desired position via its fixation means, and delivers therapeutic RF energy to the target tissue for improved tissue treatment.
    Type: Grant
    Filed: May 21, 1997
    Date of Patent: April 6, 1999
    Assignee: Irvine Biomedical, Inc.
    Inventors: Weng-Kwen Raymond Chia, Hosheng Tu
  • Patent number: 5891027
    Abstract: A cardiovascular catheter system or catheter probe system suitable for electrophysiology mapping and radiofrequency ablation of cardiac tissue comprises a catheter shaft having a proximal end, a distal handle, and a lumen extending therebetween, whereby a distal portion of the shaft is deflectable; and the soft distal section is inflatable to conform intimately to the irregular intracardiac tissue surface.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: April 6, 1999
    Assignee: Irvine Biomedical, Inc.
    Inventors: Hosheng Tu, Chi-Wu James Chang
  • Patent number: 5876399
    Abstract: This invention discloses an ablation catheter system with fixation means for use in treatment of cardiac tissues and in other medical applications, such as ablating tumors in a natural body conduit or cavity by applying RF energy, and an inner catheter having alternate energy sources for enhanced ablation. The catheter system passes through a natural body opening to reach the target tissue, where the catheter system stays in a desired position via its fixation means and delivers therapeutic energy selected from the group of laser energy, microwave, inductive radiofrequency and ultrasonic energy to the target tissue for improved treatment.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: March 2, 1999
    Assignee: Irvine Biomedical, Inc.
    Inventors: Weng-Kwen Raymond Chia, Hosheng Tu
  • Patent number: 5876340
    Abstract: An RF ablation apparatus has a delivery catheter with distal and proximal ends. A handle is attached to the proximal end of the delivery catheter. The delivery catheter has an electrode deployment means where said electrode deployment means includes a retractable tip section comprising a deployable electrode with portion of one side having a sharp edge. The tip section has a non-deployed state when it is positioned in the delivery catheter. On the other hand, the tip section has a distended deployed state when it is advanced out of the distal end of said delivery catheter. The deployed tip section has a preformed shape while the farther distal deployed electrode defines an ablation target along with portion of the forward side having a sharp edge on said electrode. The forward edge of the deployed electrode has a slightly curvature or an essentially straight shape. Said deployable electrode has ultrasonic imaging capabilities.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: March 2, 1999
    Assignee: Irvine Biomedical, Inc.
    Inventors: Hosheng Tu, Weng-Kwen Raymond Chia
  • Patent number: 5868741
    Abstract: A catheter system having a tip with fixation tines for use in treatment of tissues, such as ablating tumors in a natural body conduit or a cavity by applying RF energy through the tip, wherein the catheter system passes through a natural body opening to reach the target tissues, wherein the catheter system stays at a desired position via its fixation tines and delivers therapeutic RF energy to the target tissues for improved tissue treatment.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: February 9, 1999
    Assignee: Irvine Biomedical, Inc.
    Inventors: Weng-Kwen Raymond Chia, Hosheng Tu
  • Patent number: 5849028
    Abstract: An electrophysiology catheter suitable for radiofrequency ablation of cardiac tissue comprises an elongate catheter shaft wherein a distal tip section having multiple long electrodes and multiple temperature sensors in the proximity of the tissue contact sites and further comprising a close-loop temperature control mechanism for each electrode with at least a temperature sensor on an adjacent tiny ring.
    Type: Grant
    Filed: May 16, 1997
    Date of Patent: December 15, 1998
    Assignee: Irvine Biomedical, Inc.
    Inventor: Peter Cheng Chen
  • Patent number: 5843020
    Abstract: An RF ablation device has a delivery catheter with distal and proximal ends. A handle is attached to the proximal end of the delivery catheter. The delivery catheter has an electrode deployment means where said electrode deployment means includes a retractable tip section comprising a deployable electrode with portion of one side having a sharp edge. The tip section has a non-deployed state when it is positioned in the delivery catheter. On the other hand, the tip section has a distended deployed state when it is advanced out of the distal end of said delivery catheter. The deployed tip section has a preformed shape while the farther distal deployed electrode defines an ablation target along with portion of the forward side having a sharp edge on said electrode. The forward edge of the deployed electrode has a slightly curvature or an essentially straight shape. Alternatively, the forward edge of the deployed electrode has sections with plurality of concave or convex curvatures.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: December 1, 1998
    Assignee: Irvine Biomedical, Inc.
    Inventors: Hosheng Tu, Weng-Kwen Raymond Chia
  • Patent number: 5843152
    Abstract: An improved catheter system having at least one electrode at its tip section, can be used in ablating the arrhythmogenic point of a patient. A catheter suitable for radiofrequency ablation of cardiac tissues comprises a catheter shaft having a distal section, a distal end, a proximal end and at least one lumen extending therebetween, wherein a rotatable ball electrode is disposed at the tip section of said catheter. In one embodiment, the ablation catheter has a temperature sensor and a close-loop temperature control mechanism. In another embodiment, the ablation catheter has fluid infusion and irrigation means at its distal tip section for creating a deep and large lesion by applying radiofrequency energy and cooled fluid to said electrode.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: December 1, 1998
    Assignee: Irvine Biomedical, Inc.
    Inventors: Hosheng Tu, Weng-Kwen Raymond Chia
  • Patent number: 5792140
    Abstract: An improved ablation catheter with at least one multiple-needle electrode can be used in ablating the arrhythmogenic region instead of an arrhythmogenic point of a patient. This catheter is particularly useful for treating the patient with atrial fibrillation (AFib) indications. A catheter suitable for radiofrequency ablation of cardiac tissues comprises a delivery catheter and an inner catheter having a distal section, a distal end, a proximal end and at least one lumen extending therebetween. The ablation catheter has a temperature sensor and a close-loop temperature control. The ablation catheter having at least one multiple-needle electrode is inserted into the chambers of the heart to create a plurality of deep, large, and contiguous lesions by applying radiofrequency energy and cooled fluid to said electrode.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: August 11, 1998
    Assignee: Irvine Biomedical, Inc.
    Inventors: Hosheng Tu, Weng-Kwen Raymond Chia
  • Patent number: 5782828
    Abstract: An electrophysiology catheter suitable for radiofrequency ablation of cardiac tissue endocardially or epicardially comprises a catheter shaft whereby a distal tip section having multiple steerable curved portions, multiple long electrodes and multiple temperature sensors, further comprising a close-loop control mechanism for each electrode with a temperature sensor.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: July 21, 1998
    Assignee: Irvine Biomedical, Inc.
    Inventors: Peter Cheng Chen, Alan de la Rama
  • Patent number: 5782900
    Abstract: A catheter system suitable for electrophysiology mapping and radiofrequency ablation of cardiac tissue comprises a catheter shaft having a distal end, a proximal handle, and at least a lumen extending therebetween, wherein a distal section of the shaft is either a fixed curve or deflectable; and safety anchoring means being provided to maintain the integrity of the catheter by holding the tip electrode in place. In one embodiment, the safety means is a tip electrode with safety anchoring pins. In another embodiment, the safety means is a tip electrode with extended flexible stem having open slots on said stem.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: July 21, 1998
    Assignee: Irvine Biomedical, Inc.
    Inventors: Alan de la Rama, Weng-Kwen Raymond Chia, Hosheng Tu
  • Patent number: 5779715
    Abstract: An improved lead extraction system having multiple-jaw cutting edge that is useful for extraction and removal of unwanted lead by a minimal invasive procedure. A lead extraction system suitable for radiofrequency ablation of scar tissues surrounding the implanted lead comprises a catheter sheath having a distal end, a proximal end and at least one lumen extending therebetween, wherein a locking stylet is provided. In one embodiment, the lead extraction system has fluid infusion and irrigation means at its distal tip section and a set of ablation electrodes for loosening the target tissue by applying radiofrequency energy and cooled fluid to said electrode and its contacted tissue.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: July 14, 1998
    Assignee: Irvine Biomedical, Inc.
    Inventor: Hosheng Tu
  • Patent number: D384743
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: October 7, 1997
    Assignee: Irvine Biomedical, Inc.
    Inventor: Weng-Kwen Raymond Chia