51 results about "Cardiac catheterization" patented technology

Devices (1) and methods for accomplishing tasks within a body using infrared imaging are disclosed which, in connection with other known components, are useful in ablation, stitching and other operations, identification of sizes and composition of objects, and the creation of maps by taking multiple images at different positions or times.

Devices and methods are provided for access to the sub-retinal space that lies between the retina and the choroid in order to introduce therapies to the retina and more specifically to the sensory retina and RPE, particularly in the region of the macula. The devices comprise a catheter that incorporates advantageous size, flexibility and tip features to properly, accurately and atraumatically access the sub-retinal space. Ancillary devices to assist in placing catheters into the sub-retinal space are also provided. The catheter devices incorporate a lumen for delivery of therapeutic substances or devices into the eye.

A resonant circuit is incorporated in a stent, which implantable in a pulmonary vein using known cardiac catheterization techniques. When an external RF field is generated at the resonant frequency of the stent, RF energy is re-radiated by the stent toward electroconductive tissue in the wall of the pulmonary vein, and produces a circumferential conduction block. The stent can be made of biodegradable materials, so that it eventually is resorbed. Following an ablation procedure, the stent may be left in situ. Repeated ablation can be performed using the inserted stent until it has been determined that the desired lesions have been formed. Furthermore, the same stent can potentially be used even years after being inserted should the treated arrhythmia reoccur or a new arrhythmia develop, thereby possibly obviating the need for an invasive procedure at that future time.

Cardiac catheterization is carried out by memorizing a designation of a contact state between an electrode of the probe and the heart wall as one of an in-contact state and an out-of-contact state, and making a series of determinations of an impedance phase angle of an electrical current passing through the electrode and another electrode, identifying maximum and minimum phase angles in the series, and defining a binary classifier adaptively as midway between the extremes. A test value is compared to the classifier as adjusted by a hysteresis factor, and a change in the contact state is reported when the test value exceeds or falls below the adjusted classifier.

Radiosurgical treatments of tissues of the heart mitigate arrhythmias and treat other tumerous and non-tumerous disease using an implanted fiducial positioned in or near the heart using cardiac catheterization techniques. The fiducials may be implanted after diagnostic and planning images of the target tissues have been acquired. Fiducial implantation may take place the day of a scheduled radiosurgical treatment. Techniques to accommodate post-planning fiducial implantation may include registration of the implanted fiducial location with the treatment plan, and active fiducials may limit collateral imaging radiation exposure while enhancing tracking accuracy.

A present invention method of obtaining patent hemostasis of the radial artery by compressing the uninstrumented ulnar artery to increase radial artery flow while applying pressure to the radial artery access site; the invention further concerns a device for applying blunt pressure to the ulnar artery, and a method of use.

Cardiac catheterization is carried out by memorizing a designation of a contact state between an electrode of the probe and the heart wall as one of an in-contact state and an out-of-contact state, and making a series of determinations of an impedance phase angle of an electrical current passing through the electrode and another electrode, identifying maximum and minimum phase angles in the series, and defining a binary classifier adaptively as midway between the extremes. A test value is compared to the classifier as adjusted by a hysteresis factor, and a change in the contact state is reported when the test value exceeds or falls below the adjusted classifier.

Fenestrated Asymmetric Intracardiac Device for the completion of total cavopulmonary connection through cardiac catheterization, having a bifurcated tubular conduct, constituted by two portions (1, 2) both made of a tubular mesh covered with an impermeable polymer. Upper end (5) of first portion (1) is progressively flattened to a substantially oval shape, with progressive cross sections of an equal area. First portion (1) presents at least a lateral fenestration (5) which is selectively obturable. Second upper portion (2) bifurcates into two divergent branches (7, 6) and backwards forming with respect to the longest branch a deformed “Y”, of which: branch (6) is the longest and is introduced into the left pulmonary artery, while branch (7) is shorter and lodges into the right shorted pulmonary artery. The device defines a connection between the inferior vena cava and pulmonary branches, establishing a physiological distribution of the blood flow in both lungs.

The present invention is directed toward a lesion measuring device for use with cardiac catheterization assemblies. In one embodiment, the assembly comprises a plurality of rulers physically attached to at least one housing. The housing is configured to connect the assembly to a catheterization assembly. The assembly includes a slidable member engaged with at least one of the plurality of rulers, and a torquer configured to move in relation to a guidewire and the slidable member.

MRI-guided robotics offers possibility for physicians to perform interventions remotely on confined anatomy. While the pathological and physiological changes could be visualized by high-contrast volumetric MRI scan during the procedure, robots promise improved navigation with added dexterity and precision. In cardiac catheterization, however, maneuvering a long catheter (1-2 meters) to the desired location and performing the therapy are still challenging. To meet this challenge, this invention presents an MRI-conditional catheter robotic system that integrates intra-op MRI, MR-based tracking units and enhanced visual guidance with catheter manipulation. This system differs fundamentally from existing master / slave catheter manipulation systems, of which the robotic manipulation is still challenging due to the very limited image guidance. This system provides a means of integrating intra-operative MR imaging and tracking to improve the performance of tele-operated robotic catheterization.

Cardiac catheterization is carried out by clothing a subject in a torso vest having a plurality of sensing electrodes, magnetic location sensors, active current location sensors and patches for establishing galvanic contact with the skin. A multi-electrode probe is inserted into a cardiac chamber such that a plurality of intracardiac electrodes are disposed at respective locations in the heart. Respective locations are determined using the active current location sensors, Electrical calibration signals are emitted from the intracardiac electrodes, and received in the sensing electrodes of the torso vest. Relationships between the emitted calibration signals and the received calibration signals in the intracardiac electrodes are established to map a correspondence between the received calibration signals and the respective locations.

Cardiac catheterization is facilitated by generating first and second electroanatomic maps of a heart of a subject and designating common spatial locations that correspond to first electrical events on the first electroanatomic map and second electrical events on the second electroanatomic map. The common spatial locations of the first electroanatomic map and the second electroanatomic map are aligned to establish an aligned map, and using the location data on the aligned map to guide a probe to a point of interest.

Cardiac catheterization is carried out by inserting a multi-electrode probe into a heart, constructing a position map of the electrodes, and simulating a 3-dimensional surface of the heart. The method is further carried out by placing the position map in registration with an acquired image of the heart, constructing, based on the position map, a mesh that models the 3-dimensional surface of the heart, and adjusting positions of vertices of the mesh relative to mapped points in the position map to improve a registration of the mesh with the acquired image.

Cardiac catheterization is carried out by introducing a catheter into the coronary sinus, acquiring a first set of 2-dimensional images of the catheter, thereafter acquiring a second set of 2-dimensional images of the catheter, and creating respective 2-dimensional models of the catheter in synchronized frames of the first set and the second set. The 2-dimensional models include respective tracked 2-dimensional paths of the catheter. The first and second sets are synchronized by identifying frames that are in respective phases of the cardiorespiratory cycle. First and second 3-dimensional models of the catheter are constructed from the synchronized frames, and geometrically transformed to minimize a distance function between the two models.

Cardiac catheterization is carried out using a probe having sensing electrodes disposed on a distal portion thereof, placing the sensing electrodes in galvanic contact with respective locations in an atrium of the heart, thereafter acquiring electrograms from the sensing electrodes while concurrently detecting ventricular depolarization events, generating from the electrograms a time-varying electroanatomic map showing electrical propagation in the heart, and displaying the electroanatomic map in a series of visual images, the images including an icon that visually indicates the ventricular depolarization events.

Radiosurgical treatments of tissues of the heart mitigate arrhythmias and treat other tumerous and non-tumerous disease using an implanted fiducial positioned in or near the heart using cardiac catheterization techniques. The fiducials may be implanted after diagnostic and planning images of the target tissues have been acquired. Fiducial implantation may take place the day of a scheduled radiosurgical treatment. Techniques to accommodate post-planning fiducial implantation may include registration of the implanted fiducial location with the treatment plan, and active fiducials may limit collateral imaging radiation exposure while enhancing tracking accuracy.

The invention discloses a montmorillonite nano-purification technology and a complete set of device for different medical units in a hospital inpatient department, specifically surrounding a montmorillonite nano-pretreatment technology and the subsequent montmorillonite nano-purification integrated technology and device for medical sewage in multiple conventional wards, operating rooms, dressingchange rooms, nurse stations, hemodialysis centers, peritoneal dialysis centers, infectious wards or inpatient buildings, X-ray rooms, radiation intervention and cardiac catheterization angiography rooms and other medical units of the hospital inpatient department, so as to remove suspended solids, heavy metals, harmful ions, harmful organic substances, multiple pathogenic bacteria, parasites, residual antibiotics and other drugs, residual oil stains, surfactants, radioactive substances and the like in the medical sewage of the hospital inpatient department to the greatest extent, so as to reach the national medical sewage discharge standard, ensure the discharge safety of multiple medical sewage of the hospital inpatient department, and ensure the ecological and environmental safety around the hospital. The technology and the device have the advantages of good purification effect, low cost and long service life, and is expected to be applied to multiple medical sewage treatment in inpatient departments of multiple hospitals.

The present invention relates to a hemostasis valve device which allows a wire or a catheter to be inserted into the left or right coronary artery via the femoral artery or an arm artery when a Cardiac Catheterization or Percutaneous Transluminal Coronary Angioplasty operation is performed, wherein two independent sealing members are opened and closed by press and release actions of push buttons coupled to a body and the rotation of a fastening tube, respectively, so that the leakage or blood or the inflow of outside air is simply and effectively blocked during the operation, and a drug influx tube for allowing a medicine such as a thrombolytic drug to flow into a patient during the operation pivots and is adjusted in a stepwise manner within a certain range of angles according to body conditions or movements of the patient.

Cardiac catheterization is carried out by importing image data of a heart of a living subject into an image-processing computer system, representing the image data as a first model of the heart and the coronary sinus in a first coordinate space, and introducing a probe into the coronary sinus. Thereafter fluoroscopic image data of the probe are used to prepare a second model of the coronary sinus in a second coordinate space, and the first model is transformed into the second coordinate space by placing the coronary sinus of the second model in registration with the coronary sinus of the first model.

Disclosed are methods and devices for obtaining patent hemostasis of the radial artery by compressing the uninstrumented ulnar artery to increase radial artery flow. The device comprises a band having an inflatable bladder for applying blunt pressure to the ulnar artery. The method comprises applying a pressure to the homolateral ulnar artery and applying a pressure to the radial artery at the access site to obtain hemostasis at the access site.

Cardiac catheterization is carried out using a probe having sensing electrodes disposed on a distal portion thereof, placing the sensing electrodes in galvanic contact with respective locations in an atrium of the heart, thereafter acquiring electrograms from the sensing electrodes while concurrently detecting ventricular depolarization events, generating from the electrograms a time-varying electroanatomic map showing electrical propagation in the heart, and displaying the electroanatomic map in a series of visual images, the images including an icon that visually indicates the ventricular depolarization events.