摘要:
Methods and apparatus employed to locate body vessels and occlusions in body vessels finding particular utility in cardiac surgery, particularly minimally invasive cardiac surgery to locate cardiac arteries and occlusions in cardiac arteries are disclosed. An elongated vessel lumen probe incorporating a lumen probe element at or near the elongated vessel lumen probe distal end is advanced into the vessel lumen. A vessel surface probe manipulated by the surgeon and having a surface probe element sensor is employed to detect the lumen probe element and to follow the progress of the vessel lumen probe element as it approaches and is advanced through or is blocked by an occlusion. In the location of a coronary artery, the surface probe element sensor is moved about against the epicardium over the suspected location of the artery of interest until a surface probe element sensor of the present invention at the surface probe distal end interacts with the lumen probe element of the vessel lumen probe.
摘要:
Medical devices and methods for accessing an anatomical space of the body and particularly for penetrating the epicardium to access pericardial space and the epicardial surface of the heart in a minimally invasive manner employing suction are disclosed. The distal end of a tubular access sleeve having a sleeve wall surrounding a sleeve access lumen and extending between a sleeve proximal end and a sleeve distal end having a plurality of suction ports arrayed around the sleeve access lumen distal end opening is applied against an outer tissue layer. Suction is applied through the plurality of suction ports to a plurality of portions of the outer tissue layer. A perforation instrument is introduced through the sleeve access lumen to perforate the outer tissue layer to form an access perforation into the anatomic space while the applied suction stabilizes the outer tissue layer, whereby further treatment drugs and devices can be introduced into the anatomic space.
摘要:
A cardiac pacing lead for pacing the atria and a method of its use. The lead is provided with a mechanism for maintaining an atrial pacing electrode adjacent stimulable tissue in a patient's superior vena cava and an additional electrode locatable in the right ventricle or elsewhere when the atrial electrode is so located One such mechanism for maintaing the atrial electrode's position may be a lead body displaying pre-formed laterally extending curves sized to span a patient's superior vena cava, with the atrial electrode located thereon.
摘要:
An arrangement for introducing and implanting the electrode(s) of an endocardial implantable cardiac lead at a cardiac implantation site within a heart chamber or vessel. An elongated guide body formed of flexible material and extending between a guide body proximal end and a guide body distal end is advanced transvenously to position the guide body distal end in relation to the cardiac implantation site. A guide body tracking mechanism is coupled with the lead distal end for receiving and slidingly engaging the guide body to allow the cardiac lead to be advanced along the guide body until the electrode is positioned at the cardiac implantation site. A pusher mechanism formed of an elongated pusher body of flexible material extends between a pusher body proximal end and a pusher body distal end and has a cardiac lead engaging mechanism for engaging the cardiac lead at or adjacent the distal lead end. The pusher body has sufficient column strength to be advanced alongside the guide body and lead body with the cardiac lead engaging mechanism engaging and slidingly advancing the guide body tracking mechanism and the cardiac lead distally along the guide body to thereby allow the cardiac lead to be advanced along the guide body until the electrode is positioned at the cardiac implantation site. The lead body is released from the lead engaging mechanism and fixed, if the lead includes a fixation mechanism. The pusher mechanism is retracted by retraction of the pusher body.
摘要:
An implantable pacing lead system for pacing a patient's heart, including a delivery catheter and a lead delivered by the delivery catheter. The lead takes the form of a single non-diverging filament having a proximal end and a distal end and carries an electrode mounted to a distal portion of the lead body. An active fixation device is mounted fixedly to, and extends laterally from, the lead body proximal to and longitudinally spaced from the electrode. During advancement of the lead through the vasculature the active fixation device is located within the delivery catheter. At the point of desired location of the active fixation device, it is advanced out of the delivery catheter and engaged with heart tissue. The lead body has greater torsional rigidity proximal to the active fixation device than distal to the active fixation device.
摘要:
A cardioversion/defibrillation lead, and method of manufacture thereof, for location in a human heart. An elongated lead body having an insulating outer sheath extends between proximal and distal ends thereof, and an elongated defibrillation conductor within the lead body extends from a connector at the proximal end to a distal end at a predetermined location along the lead body length. A spiral band defibrillation electrode extends in spiral turns around the exterior of the insulating outer sheath for a pre-determined defibrillation electrode length. The defibrillation electrode is fabricated of a single tube of body compatible, electrically conductive material having first and second tube ends and an inside diameter selected to fit over the outer sheath and the internally disposed defibrillation lead conductor. At least one (and preferably a plurality) spiral slit is formed therein extending from first and second slit end points, spaced from the first and second ends, respectively, thereby forming at least one spiral band integrally attached to first and second end bands, respectively. At least one of the first and second end bands is attached to the defibrillation lead conductor at or near the distal end thereof. In other embodiments, intermediate connection bands are formed along the length of the spiral band, and electrical connections are made between such intermediate connection bands and the defibrillation lead conductor.
摘要:
A cardioversion/defibrillation lead and method of implantation thereof for location in a human heart of the type comprising an elongated lead body having proximal and distal end sections and having a looped intermediate section. The proximal and distal end sections of the lead have generally straight configurations, and the intermediate section is constructed such that when the distal section is located at the apex of the right ventricle of the heart, the loop of the intermediate section is located in the outflow tract of the heart. One or more elongated defibrillation electrode(s) extends along the intermediate section of the lead body.