摘要:
A vascular nerve ablation (denervation) system includes a multiplicity of expandable needles which open around a central axis to engage the wall of a blood vessel allowing the injection of a cytotoxic or neurotoxic solution for ablating conducting tissue in and near the vessel wall of a renal artery or pulmonary vein. The expandable needles are formed of self-expanding materials and include structures which limit the distance of penetration of the injection needles into the tissue of the wall of the blood vessel.
摘要:
At the present time, physicians often treat patients with atrial fibrillation (AF) using radiofrequency (RF) catheter systems to ablate conducting tissue in the wall of the Left Atrium of the heart around the ostium of the pulmonary veins. These systems are expensive and take time consuming to use. The present invention circular ablation system CAS includes a multiplicity of expandable needles that can be expanded around a central axis and positioned to inject a fluid like ethanol to ablate conductive tissue in a ring around the ostium of a pulmonary vein quickly and without the need for expensive capital equipment. The expansion of the needles is accomplished by self-expanding or balloon expandable structures. The invention includes centering means so that the needles will be situated in a pattern surrounding the outside of the ostium of a vein. Also included are members that limit the distance of penetration of the needles into the wall of the left atrium. The present invention also has application to ablating tissue around the ostium of a renal artery for the treatment of hypertension.
摘要:
At the present time, physicians often treat patients with atrial fibrillation (AF) using radiofrequency (RF) catheter systems to ablate conducting tissue in the wall of the Left Atrium of the heart around the ostium of the pulmonary veins. These systems are expensive and take time consuming to use. The present invention circular ablation system CAS includes a multiplicity of expandable needles that can be expanded around a central axis and positioned to inject a fluid like ethanol to ablate conductive tissue in a ring around the ostium of a pulmonary vein quickly and without the need for expensive capital equipment. The expansion of the needles is accomplished by self-expanding or balloon expandable structures. The invention includes centering means so that the needles will be situated in a pattern surrounding the outside of the ostium of a vein. Also included are members that limit the distance of penetration of the needles into the wall of the left atrium, or the aortic wall. The present invention also has an important application to ablate tissue around the ostium of one or both renal arteries, for the ablation of the sympathetic nerve fibers and/or other afferent or efferent nerves going to or from each kidney in order to treat hypertension.
摘要:
A catheter-based/intravascular fluid injection system with application to renal denervation includes a multiplicity of needles which expand open around a central axis to engage the wall of a blood vessel, or the wall of the left atrium, allowing the injection of a cytotoxic and/or neurotoxic solution for ablating conducting tissue, or nerve fibers around the ostium of the pulmonary vein, or circumferentially in or just beyond the outer layer of the renal artery. The expandable delivery system includes expandable components that facilitate positioning of a multiplicity of injection needles against the inside wall of a blood vessel from where they can be advanced. The system also includes means to limit and/or adjust the depth of penetration of the ablative fluid into the tissue of the wall of the targeted blood vessel.
摘要:
A catheter-based/intravascular ablation (denervation) system includes a multiplicity of needles which expand open around a central axis to engage the wall of a blood vessel, or the wall of the left atrium, allowing the injection of a cytotoxic or/or neurotoxic solution for ablating conducting tissue, or nerve fibers around the ostium of the pulmonary vein, or circumferentially in or just beyond the outer layer of the renal artery. The expandable needle delivery system is formed with self-expanding materials and include structures, near the end portion of the needles, or using separate guide tubes. The system also includes means to limit and/or adjust the depth of penetration of the ablative fluid into the tissue of the wall of the targeted blood vessel.
摘要:
An integrated catheter system for performing angiography on a human patient, the integrated catheter system consisting of an angiographic catheter onto which a thin-walled sheath is co-axially mounted. The angiographic catheter having an essentially straight and elongated proximal section in the form of a cylindrical shaft that is surrounded for less than one-half of its length by the thin-walled sheath that has an outer diameter that is less than 0.25 mm greater than the outside diameter of the angiography catheter. The strength to prevent buckling of the thin-walled sheath being provided by the shaft of the angiographic catheter. The integrated catheter system also being ideal for the placement of stents using small diameter stent delivery systems such as the stent-on-a-wire system.
摘要:
Disclosed are methods for detecting an acute myocardial infarction (i.e., a heart attack) at the earliest possible time and promptly warning the patient that he should immediately seek medical care. The present invention includes an implantable electronic system that can sense a change in the patient's electrogram that is indicative of a heart attack. If a heart attack is sensed, the device would then cause an implantable and/or externally located alarm to be actuated to warn the patient of his condition and a medical practitioner at a remote diagnostic center would receive the patient's electrogram for analysis. The patient or a caretaker would then be informed to self-inject medication through a subcutaneous, pass-through drug port that can be a separate device or integrated into the implanted device that is designed for the early detection of a heart attack. The methods of the present invention include determining if a human patient is likely to have a heart attack and, if he is, then implanting within that patient a device that can sense when a heart attack occurs and alarm the patient to take appropriate actions if a heart attack does occur.
摘要:
An introducer sheath for placement into the vascular system of a human subject. The introducer sheath has a tubular shaft, a side arm, and a hemostasis valve with an integrated attachment mechanism for attaching and detaching a proximal end of the introducer sheath to and from the skin of the human subject.
摘要:
A buddy wire guide wire has a wire section for guiding a catheter to a particular site in the human body. The buddy wire guide wire has a distal section with a distal end and an opposing proximal end. The wire section is attached to the proximal end of the distal section with the distal section being placed coaxially around the shaft of some existing medical device which has been inserted into the human body. The distal section permits the buddy wire to be advanced into the human body over the medical device by using the medical device as a guide.
摘要:
A percutaneous system to open a stenosed vessel has a catheter for insertion into a vessel. An expandable filter mechanism is within a deployable sheath for expansion against a vessel wall when the sheath is displaced by a first displacement distance. A stenosis opening mechanism is within the deployable sheath and is radially expandable near the expandable filter mechanism with the stenosis opening mechanism being expandable against the stenosis when the stenosis opening mechanism is located within the vessel in longitudinal alignment with the stenosis following displacement of the sheath by a second displacement distance. Radiopaque markers align the stenosis opening mechanism with the stenosis.