摘要:
An instrument for performing a percutaneous laparoscopic cholecystectomy includes a generally rigid, tubular body with a proximal end, a distal end and a lumen extending between these two ends and with a pair of bipolar electrodes projecting from the distal end of the tubular body and a handle member affixed to its proximal end. The outside diameter of the tubular body is sufficiently small that it can readily pass through a cannula inserted through a puncture made through the abdominal wall. A pair of conductors, connected at one end to the bipolar electrodes and at their other end to a source of radio frequency voltage, extend through the tube's lumen and a handle. Moreover, a fluid port may be formed through the handle so as to be in fluid communication with the lumen of the tube whereby fluids may be perfused through the instrument during its use or a suction may be applied to the proximal port for aspirating the surgical site. In one embodiment of the invention, the bipolar electrodes may be formed as conductive traces extending along the peripheral edges of a thin ceramic blade. In an alternative arrangement, the bipolar electrodes comprise first and second closley space J-spaced conductive hook members.
摘要:
An instrument for performing a percutaneous laparoscopic cholecystectomy includes a generally rigid, tubular body with a proximal end, a distal end and a lumen extending between these two ends and with a pair of bipolar electrodes projecting from the distal end of the tubular body and a handle member affixed to its proximal end. The outside diameter of the tubular body is sufficiently small that it can readily pass through a cannula inserted through a puncture made through the abdominal wall. A pair of conductors, connected at one end to the bipolar electrodes and at their other end to a source of radio frequency voltage, extend through the tube's lumen and a handle. Moreover, a fluid port may be formed through the handle so as to be in fluid communication with the lumen of the tube whereby fluids may be perfused through the instrument during its use or a suction may be applied to the proximal port for aspirating the surgical site. In one embodiment of the invention, the bipolar electrodes may be formed as conductive traces extending along the peripheral edges of a thin ceramic blade. In an alternative arrangement, the bipolar electrodes comprise first and second closely spaced J-shaped conductive hook members.
摘要:
An angioplasty catheter having an outer tubular member and a coaxially aligned inner tubular member. The outer tube is of a first predetermined diameter over a majority of its length, but then tapers down, in a transition zone, to a second predetermined diameter less than the first and which extends to the catheter's distal tip. The inner tube has a distal end shaped to mate with the inside surface of the outer tube in the transition zone to form a seal when the inner tube is advanced in the distal direction. An expander is secured to the outer tube and inflatable by perfusing a fluid in the zone between the outer and inner tubes and through ports formed through the wall of the outer tube in the transition zone. By manipulating the proximal end of the inner tube, blood or other fluids may be perfused or exasperated and made to inflate or deflate the expander, the distal end of the inner tube acting as a valve, seating with the inner surface of the outer tube in the transition zone. The inner tube may be removed completely for maximum perfusion or for replacement with a guide wire or an optical fiber when performing laser angioplasty. The hub on the proximal end of the catheter body facilitates the manipulation of the aforementioned valve and the introduction of a perfusant along the length of the catheter body.
摘要:
A RF ablation catheter for removing athero-stenotic lesions or modifying the tissue characteristics of the interior walls of selected blood vessels is described. The catheter is characterized in having a tip member which during the initial placement of the catheter within the vascular system so that the distal tip member is disposed in a working relation with the lesion to be removed, means are provided for increasing the cross-sectional profile of the tip members to thereby cause it to move into engagement with the lesion to be excised. The application of an RF voltage across a pair of bipolar electrodes is used to create an electric arc for effecting the cutting action, or alternatively, just sufficient RF energy to sear or otherwise alter the tissue surfaces engaged by the distal tip member.
摘要:
A RF ablation catheter for removing athero-stenotic lesions or modifying the tissue characteristics of the interior walls of selected blood vessels is described. The catheter has a distal tip member which is disposed in a working relation with the lesion to be removed during the initial placement of the catheter within the vascular system. Means are provided for increasing the cross-sectional profile of the tip member to thereby cause it to move into engagement with the lesion to be excised. The application of an RF voltage across a pair of bipolar electrodes is used to create an electric arc for effecting the cutting action, or alternatively, just sufficient RF energy to sear or otherwise alter the tissue surfaces engaged by the distal tip member.
摘要:
A RF ablation catheter for removing athero-stenotic lesions or modifying the tissue characteristics of the interior walls of selected blood vessels is described. The catheter is characterized in having a tip member which during the initial placement of the catheter within the vascular system so that the distal tip member is disposed in a working relation with the lesion to be removed, means are provided for increasing the cross-sectional profile of the tip members to thereby cause it to move into engagement with the lesion to be excised. The application of an RF voltage across a pair of bipolar electrodes is used to create an electric arc for effecting the cutting action, or alternatively, just sufficient RF energy to sear or otherwise alter the tissue surfaces engaged by the distal tip member.
摘要:
A RF ablation catheter for removing athero-stenotic lesions or modifying the tissue characteristics of the interior walls of selected blood vessels is described. The catheter is characterized in having a tip member which during the initial placement of the catheter within the vascular system so that the distal tip member is disposed in a working relation with the lesion to be removed, means are provided for increasing the cross-sectional profile of the tip members to thereby cause it to move into engagement with the lesion to be excised. The application of an RF voltage across a pair of bipolar electrodes is used to create an electric arc for effecting the cutting action, or alternatively, just sufficient RF energy to sear or otherwise alter the tissue surfaces engaged by the distal tip member.
摘要:
A system and method for rejuvenating skin through ablation using a handheld device (200) having a removable treatment component (213) with an abrasive material on one surface of the component which surface is on a portion of the treatment component (213) configured to conform to a skin surface. The system further includes application of other elements to facilitate skin recovery and rejuvenation processes.
摘要:
An apparatus for delivery of an elongate member into the lumen of a trans-dermal catheter. In a preferred embodiment, the apparatus comprises a protective sheath configured to at least substantially surround an elongate member; and slidable member configured to travel along the protective sheath, the slidable member operatively coupled to the elongate member; wherein the elongate member is insertable into a lumen of a trans-dermal catheter by moving the slidable member along at least a part of the length of the protective sheath. In another embodiment, the apparatus comprises a protective sheath configured to at least substantially surround an elongate member; a slidable member configured to travel along the protective sheath, the slidable member operatively coupled to the elongate member; and a connecting member positioned on the distal end of the protective sheath, the connecting member configured to lock onto the distal end of a trans-dermal catheter; wherein the elongate member is insertable into the lumen of the trans-dermal catheter by moving the slidable member along at least a part of the length of the protective sheath.
摘要:
A method and apparatus for repairing a damaged intervertebral disc nucleus in a minimally invasive manner utilizes a modular disc prosthesis preferably comprised of at least three modular segments and at least two rails that operably connect adjacent modular segments. In one embodiment, each modular segment includes a harder inner portion and a softer outer portion. Preferably, the rails operate to slidably connect and interlock adjacent modular segments. A stem portion of the rails that extends outside the periphery of the body of the prosthesis is removable after implantation such that the modular segments form an implanted unitary device that closely mimics the geometry of the disc nucleus cavity.