16 results about "Left atrium" patented technology

The present disclosure relates to a device assembly and a method for treating heart failure by normalizing elevated blood pressure in the left atrium of a heart of a mammal. Disclosed herein is a transcatheter interatrial septum excision device assembly configured to create a sized interatrial aperture between the right and left atria of a heart for the relief of elevated left atrial pressure. The device assembly comprises a delivery catheter, a tissue stabilizer attached to a first catheter having a central lumen and a penetrating tip that permits passage of a guidewire, and a cutter attached to a second catheter having a central lumen that permits passage of the first catheter. Alternative configurations comprise a (third) catheter having a central lumen that permits passage of the aforementioned components to and from the right atrium, a tissue retention mechanism and an optional coaxial alignment mechanism.

Methods and devices for transvascular prosthetic chordae tendinea implantation are disclosed. A catheter is advanced into the left atrium. From an atrium side, a leaflet connector carried by a distal end of the catheter can be anchored to a superior surface of a mitral valve leaflet. A needle is axially advanceable through the leaflet connector and through the leaflet. A leaflet anchor having a leaflet suture can be advanced out of the needle to secure the mitral valve leaflet to the leaflet suture. A ventricular anchor is anchored to the wall of the ventricle to secure the ventricular wall to a ventricle suture. The leaflet suture and the ventricle suture may be tensioned and connected by a suture lock to form an artificial chordae.

A method of sensing a physiological parameter involves advancing a delivery catheter to a right atrium of a heart of a patient via a transcatheter access path, advancing the delivery catheter through an atrial septal wall into a left atrium of the heart, deploying a distal anchor of a sensor implant device from the delivery catheter, anchoring the distal anchor of the sensor implant device to a first pulmonary vein, withdrawing the delivery catheter from the first pulmonary vein, thereby exposing at least a portion of a sensor module of the sensor implant device in the left atrium, deploying a proximal anchor of the sensor implant device from the delivery system, anchoring the proximal anchor of the sensor implant device to a second pulmonary vein, and withdrawing the delivery catheter from the heart.

Various embodiments of the present invention comprise a single-chamber collapsible and expandable prosthetic valve implant device with an elevated valve section and comprising the following capabilities: (1) preservation of native valve functionality; (2) initial preservation of native valve functionality with subsequent full replacement of native valve functionality; (3) full replacement of native valve functionality; and / or (4) mitigation of the prolapsing distance of the dysfunctional leaflets by preventing the anterior excursion of the prolapsing leaflets above the upper annular surface and into the left atrial chamber in order to preserve native leaflet functionality for as long as possible. The expanded and implanted device does not extend beyond the boundaries of the subject heart chamber, e.g., the left atrium, thereby enabling the preservation of any remaining native valve functionality with subsequent full replacement of native valve functionality if and when needed.

This application relates to a coronary sinus and left atrium shunt system, belonging to the field of medical device technology. The system described in this application, by setting up a puncture component and a shunt component including a cutter, allows for the cutting of a portion of myocardial tissue between the coronary sinus and the left atrium, forming a shunt orifice. This establishes a shunt channel between the coronary sinus and the left atrium, effectively avoiding the embolism risk associated with atrial septal shunts and improving coronary artery blood perfusion, potentially benefiting myocardial recovery.

Devices, systems, and methods for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium are disclosed. Devices and methods include a method for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium, the method comprising: implanting a variable occluder in a coronary sinus region proximate a left atrium, wherein the variable occluder is configured to gradually increase a level of blood flow restriction over a period of days to enable a venous system of the myocardium to compensate for increased pressure caused by the gradual increase in the level of blood flow restriction; and following venous system compensation, shunting oxygenated blood flow into the coronary sinus to cause retrograde flow of oxygenated blood in at least a portion of the venous system of the myocardium to thereby enable revascularization of the myocardium.

The application relates to a semi-supervised medical image segmentation method based on double-view complementary consistency, which only uses a small amount of labeled medical image data to mine potential feature information in a large amount of unlabeled data to improve the segmentation model performance, and comprises the following steps: a feature space distillation mechanism is used to extract and transfer multi-scale semantic features through a teacher-student model; a double-view fusion strategy is used to optimize pseudo labels and optimize the learning effect of the model on unlabeled data; and an uncertainty estimation method assisted by a pre-trained autoencoder is used to optimize the reliability and segmentation precision of the model. Experimental results on a left atrium (LA) and liver tumor segmentation (LiTS) dataset show that the method achieves good effects in terms of segmentation precision and model robustness.

An apparatus, system, and method for creating a shunt between a right atrium and a left atrium of a patient's heart. An apparatus includes a shielding structure, a tube proximal to the shielding structure, and an actuating mechanism at a proximal end of the tube. The tube is configured to pass through a lumen of a steerable catheter. The actuating mechanism is for deploying the shielding structure through the tube. The shielding structure is configured for passing through an opening in an atrial septum from the right atrium to the left atrium, and for being retracted in a proximal direction to contact the atrial septum for shielding a proximity of the opening from blood flow in the left atrium to facilitate cryoablation of the opening from the right atrium.

The present technology is directed to adjustable interatrial shunting systems that selectively control blood flow between the left atrium and the right atrium of a patient. The adjustable interatrial devices include a shunting element having an outer surface configured to engage native tissue and an inner surface defining a lumen that enables blood to flow from the left atrium to the right atrium when the system is deployed across the septal wall. The systems can include an actuation assembly for selectively adjusting a geometry of the lumen and / or a geometry of a lumen orifice to control the flow of blood through the lumen.

The application discloses a kind of near-field coherent heart radio frequency sensing method and system based on code division multiple access, comprising: 4-way frequency f synchronous baseband signal is configured, 4-way synchronous chip is configured, synchronous baseband signal is multiplied with corresponding synchronous chip to modulate, and 4-way digital baseband signal is obtained;4-way digital baseband signal is handled to obtain 4-way heart measurement signal;4-way heart measurement signal is respectively transmitted to corresponding antenna by radio frequency transceiver and is emitted;The antenna is respectively arranged in left ventricle, left atrium, right ventricle, right atrium;Antenna receives reflected signal, and is recorded as heart sensing signal;Heart sensing signal is transmitted to radio frequency transceiver, and after processing, the baseband signal containing heart chamber beat information is obtained;The baseband signal containing heart chamber beat information is multiplied with corresponding synchronous chip to demodulate, band-pass filter, and the demodulation signal corresponding to heart chamber beat information is obtained respectively.

A device for providing cardiac treatment at the left atrium of a patient's heart. The device includes a retention body and a prosthetic valve. The retention body has a shape that can be manipulated between a collapsed state and a normal or expanded state. First and second openings are defined at one side of the retention body, and a lower opening is defined at an opposite side. The prosthetic valve is carried by the retention body at the lower opening. The retention body is configured to engage a substantial portion of an interior surface of the left atrium, securing the prosthetic valve at a desired location relative to a native mitral valve (e.g., within the mitral valve or slightly spaced from the mitral valve). The first and second openings are sized and shaped so as to permit blood flow from the pulmonary veins into the interior region.

A system for treating atrial dysfunction, including heart failure and / or atrial fibrillation, that includes one or more pressurizing elements and control circuitry. The one or more pressurizing elements can comprise one or more balloons and can be configured to be positioned in the left atrium, and optionally the pulmonary artery, of a patient's heart. The one or more pressurizing elements can be coupled to one or more positioning structures that can be configured to position the one or more pressurizing elements in the left atrium, and optionally the pulmonary artery. The control circuitry can be configured to operate the one or more pressurizing elements to decrease or increase pressure and / or volume in the left atrium, and optionally the pulmonary artery, in accordance with different phases of the cardiac cycle. The control circuitry can be further configured to operate the one or more pressurizing elements to generate coordinated pressure modifications in the left atrium, and optionally the pulmonary artery.

This application relates to the field of medical devices, specifically to a novel atrial septal puncture guidewire and a puncture system composed of the guidewire. The guidewire includes a guidewire body, a tip electrode, a spring, and an insulating layer. The tip electrode is a metal cavity with a through-hole at one end for the guidewire body to pass through and a closed, smooth spherical surface at the other end. Both ends of the guidewire body pass through the through-hole and are welded to a tip electrode inside the smooth spherical surface. One end of the guidewire body is bent into a "J" shape, and the other end is a pigtail shape formed by multiple bends. When performing puncture using this system, the pigtail end is used for puncture. After puncture, the tip electrode at the pigtail end can be restored to a pigtail shape in the left atrium for fixation, providing a stable anchor point for catheter advancement. Simultaneously, clear imaging is possible under ICE (Internal Chest Imaging), reducing the radiation exposure time during puncture. The "J"-shaped end is used as a monopolar mapping electrode in the atrium, reducing the number of instruments used during the procedure.