Abstract:
Methods and systems for determining a surface geometry of an object, including determining a first projection matrix based on a first imaging device, determining a second projection matrix based on a second imaging device, obtaining at least one first two-dimensional (2D) image of the object using the first imaging device, obtaining at least one second 2D image of the object using the second imaging device, determining a contour of the object in the first 2D image and the second 2D image, and, based on the at least two contours, the first projection matrix, and the second projection matrix, reconstructing 3D data associated with the surface of the object. In one embodiment, the object can be a heart.
Abstract:
Methods and systems for computing epicardial surface electric potentials based on measured body surface electric potentials (802), where the methods and systems include representing at least one geometric relationship between at least one body surface electric potential measuring system and the epicardial surface as a multidimensional matrix, estimating an inverse of the multidimensional matrix based on a Generalized Minimum Residual (GMRes) method (812), and, based on the inverse matrix and the measured body surface potentials, determining the epicardial surface electric potentials.
Abstract:
Methods and systems for computing epicardial surface electric potentials based on measured body surface electric potentials, where the methods and systems include representing at least one geometric relationship between at least one body surface electric potential measuring system and the epicardial surface as a multidimensional matrix, estimating an inverse of the multidimensional matrix based on a Generalized Minimum Residual (GMRes) method, and, based on the inverse matrix and the measured body surface potentials, determining the epicardial surface electric potentials.
Abstract:
A device for measuring parameters of human tissue includes a multielectrode catheter for taking multiple measurements of the electrical characteristics of the human tissue, a concentric tube catheter located inside the multielectrode catheter, for providing structural support to the multi-electrode catheter and for serving as a conduit for advancing or withdrawing the multielectrode catheter over its surface; and an imaging catheter located inside the concentric tube catheter for taking multiple multiple measurements of anatomical characteristics of the human tissue.
Abstract:
A combined nasopharyngeal airway and pulse oximeter sensor capable of monitoring the posterior pharynx, posterior soft palate or nasal mucosa is disclosed. The nasopharyngeal airway (10) includes a thickened wall section (12) over approximately one-third of its circumference. Pulse oximeter sensor elements (20, 22, 24, 26) may be embedded in the airway. The pulse oximeter sensor elements may include a light source (20), which preferably emits light at wavelengths around 660 nm (red) and around 940 nm (near infrared), and a light detector (22). The pulse oximeter sensor elements may be connected to a pulse oximeter monitor (spectrophotometer) or other external device for analysis.
Abstract:
This invention is an electrode catheter for cardiac electrophysiology. An elongated body (11) suitable for intravascular insertion surrounds a plurality of electrode lead wires (19). A composite electrode comprises a plurality of tip electrodes (31) and defines a margin (40) along a proximal edge. Each tip electrode (31) is electrically connected to an associated electrode lead wire (19) and is adjacent to another tip electrode (31) on at least one side along an axis of the elongated body (11). Each tip electrode (31) is separated from another tip electrode (31) by insulation (32). A cup electrode (33) is electrically connected to an associated electrode lead wire (19) and defines a cavity (50) shaped to overlap the margin (40) of the composite electrode (30). The cup electrode (33) is fixedly secured to the composite electrode (30) and to a distal end of the elongated body (11) and is separated from the composite electrode (30) by insulation (32).
Abstract:
A probe (110) useful for invasively monitoring the oxygen saturation level of blood in the tissue walls of an anatomical cavity, for example in the esophagus, rectum or vaginal cavity of a human patient. The probe (110) may also be suitably employed in many veterinary applications. The probe (110) generally comprises a chassis (112) with an electrical connector extending from the proximal end of the chassis and terminating at a plug (132) configured for connection to a pulse oximeter box. The probe (110) further includes an optics assembly (126, 128) configured for either reflective or transmissive optics and configured to generate and transmit electrical signals that are indicative of the dynamic oxygen saturation level of blood in the wall tissue. In a further embodiment of the invention, the probe (110) may include a deployment device (119) attached to the chassis (112), for biasing the optics assembly (126, 128) into the tissue wall of the anatomical canal. The deployment device (118) may be, for example, a spring, a balloon or any other biasing device which urges the optics assembly into the wall tissue of the anatomical cavity. Further, the oximetry sensing assembly may be configured as part of an esophageal stethoscope having other sensing devices, for example, a temperature sensor (122), a pacing assembly (135), and an acoustic monitor (124).
Abstract:
The present invention is a multifunctional visceral catheter (1) having a self-guiding system in the form of one or more sensor systems (7, 14, 7', 14', 6, 12) which are sensitive to a predetermined analyte having a specific relationship to an organ associated with a given visceral venous system, such that values of the analyte within the visceral venous system are substantially different from values of the analyte outside the visceral venous system, e.g., galactose in the hepatic venous system or creatinine in the renal venous system.
Abstract:
Systems (10) for examining heart tissue morphology deploy one or more electrodes (38) into the heart in contact with endocardial tissue. The systems transmit electrical current from the electrodes (38) in paths through the contacted endocardial tissue. Based upon these current transmissions, the systems derive the electrical characteristics of tissue lying in the path. This electrical characteristc can be directly correlated to tissue morphology. The systems maximize surface contact with endocardial tissue, while minimizing contact with the surrounding blood pool, to obtain accurate tissue electrical characteristic measurements.