39 results about "Left sided heart" patented technology

In one embodiment, the present invention provides a prosthesis that can be implanted within a heart to at least partially block gaps that may be present between the two mitral valve leaflets. In one preferred embodiment, the prosthesis includes an anchoring ring that expands within the left atrium to anchor the prosthesis and a pocket member fixed to the anchoring ring. The pocket member is positioned within the mitral valve, between the leaflets so that an open end of the pocket member is positioned within the left ventricle. When the mitral valve is open, blood flows past the pocket member, maintaining the pocket member in a collapsed state. When the mitral valve closes, the backpressure of the blood pushes into the pocket member, expanding the pocket member to an inflated shape. The mitral valve leaflets contact the expanded pocket member, allowing the prosthesis to block at least a portion of the openings between the leaflets, thereby minimizing regurgitated blood flow into the left atrium.

In one embodiment, the present invention provides a prosthesis that can be implanted within a heart to at least partially block gaps that may be present between the two mitral valve leaflets. In one preferred embodiment, the prosthesis includes an anchoring ring that expands within the left atrium to anchor the prosthesis and a pocket member fixed to the anchoring ring. The pocket member is positioned within the mitral valve, between the leaflets so that an open end of the pocket member is positioned within the left ventricle. When the mitral valve is open, blood flows past the pocket member, maintaining the pocket member in a collapsed state. When the mitral valve closes, the backpressure of the blood pushes into the pocket member, expanding the pocket member to an inflated shape. The mitral valve leaflets contact the expanded pocket member, allowing the prosthesis to block at least a portion of the openings between the leaflets, thereby minimizing regurgitated blood flow into the left atrium.

A cannulation system for cardiac support uses an inner cannula disposed within an outer cannula. The outer cannula includes a fluid inlet for placement within the right atrium of a heart. The inner cannula includes a fluid inlet extending through the fluid inlet of the outer cannula and the atrial septum for placement within at least one of the left atrium and left ventricle of the heart. The cannulation system also employs a pumping assembly coupled to the inner and outer cannulas to withdraw blood from the right atrium for delivery to the pulmonary artery to provide right heart support, or to withdraw blood from at least one of the left atrium and left ventricle for delivery into the aorta to provide left heart support, or both.

Disclosed are a means and method for rapidly and accurately positioning a toroidal balloon with its distal surface placed tightly against the endocardial surface of the left atrium at a location that is close to the ostium of a pulmonary vein. On the exterior surface of the toroidal balloon can be an electrically conducting wire that is capable of causing rf energy to be placed into the tissue of the left atrium so as to ablate that tissue to alter the conduction of aberrant electrical signals of the heart that are associated with atrial fibrillation. The toroidal balloon is wrapped circumferentially around a tapered balloon that is placed into the pulmonary vein. This system can be applied successively to at least one or as many as all four of the pulmonary veins that enter the left atrium to treat the patient's atrial fibrillation.

A method for accessing the left atrial appendage with a balloon-tipped transseptal sheath is disclosed. A transseptal sheath is delivered to the left atrium through the intraatrial septum from the right atrium. The balloon tip may be inflated to prevent the transseptal sheath from falling proximally into the right atrium. The inflated balloon tip permits safe probing and exploration of the left atrial appendage and facilitates safe maintenance of the position of the transseptal sheath within the left atrial appendage while delivering an implantable device to the left atrial appendage.

Methods for using blood pumps to treat heart failure are disclosed. The pump is mounted on an interior of a stent, and the stent is releasably mounted on a distal end of a catheter. The distal end of the catheter is inserted into a peripheral artery and advanced to position at a region of interest within the descending aorta, the ascending aorta, or the left ventricle. The stent and the pump are released from the catheter, and the pump is activated to increase blood flow downstream of the pump. The pump can also be positioned in the vena cava or used to treat right-sided heart failure following the insertion of an LVAD, or to improve venous return in patients with varicose veins. Non-stent pumps are described for insertion between the pulmonary vein and aorta, and between the vena cava and pulmonary artery designed for use during cardiac surgery.

A catheter design for ablating AF based upon the true anatomy of the left atrium and especially the left atrial pulmonary vein junction, obtained by unique imaging techniques. The catheter design will conform to the true anatomy of the anatomical structures to be ablated and takes into account the complex 3-D geometry of the left atrium and the various sizes and shapes of the pulmonary veins and their openings into the left atrium.

A method for accessing the left atrial appendage with a balloon-tipped transseptal sheath is disclosed. A transseptal sheath is delivered to the left atrium through the intraatrial septum from the right atrium. The balloon tip may be inflated to prevent the transseptal sheath from falling proximally into the right atrium. The inflated balloon tip permits safe probing and exploration of the left atrial appendage and facilitates safe maintenance of the position of the transseptal sheath within the left atrial appendage while delivering an implantable device to the left atrial appendage.

A preformed catheter set for production of linear ablation lines in the left and right atrium for treatment of atrial fibrillation includes at least a first catheter including a pre-shaped distal segment having a distal linear ablation antenna and a U-shaped curve portion proximal to the distal linear ablation antenna.

A cannulation system for cardiac support uses an inner cannula disposed within an outer cannula. The outer cannula includes a fluid inlet for placement within the right atrium of a heart. The inner cannula includes a fluid inlet extending through the fluid inlet of the outer cannula and the atrial septum for placement within at least one of the left atrium and left ventricle of the heart. The cannulation system also employs a pumping assembly coupled to the inner and outer cannulas to withdraw blood from the right atrium for delivery to the pulmonary artery to provide right heart support, or to withdraw blood from at least one of the left atrium and left ventricle for delivery into the aorta to provide left heart support, or both.

The invention provides a division method and device of left ventricular myocardium. The method comprises the following steps of: (1) positioning a left ventricular central point, and acquiring a region of interest in an image at a layer where the left ventricular central point is located; (2) positioning a blood pool region in the region of interest in the image at the layer where the left ventricular central point is located according to grey scale information and the left ventricular central point; (3) determining a mass center of the blood pool region, determining blood pool regions in an original image in all layers except the layer where the left ventricular central point is located, thereby obtaining a division result of left ventricular endocardium; and (4) obtaining a division result of left ventricular adventitia by a dynamic planning method according to the division result of the left ventricular endocardium, and thus obtaining a division result of the left ventricular myocardium. By the technical scheme provided by the invention, the left ventricular myocardium can be fully, uniformly and stably divided.

Devices and methods for supplementing and / or replacing native cardiac valve functionality, e.g., the mitral valve with a single prosthetic leaflet. An exemplary device is directed to dysfunctional mitral valves. In some cases, the entire device, including the single prosthetic leaflet, will be arranged entirely above the dysfunctional mitral valves and, therefore, disposed entirely within the left atrium. In other cases, the valve support and / or single prosthetic leaflet may extend a distance into the annulus between the left atrium and left ventricle. In some cases, the device will not physically interact with the native leaflets. In other cases, the device may physically interact with the native leaflets.

The invention relates to a method for segmenting a cardiac nuclear magnetic resonance image. The method for segmenting the cardiac nuclear magnetic resonance image comprises the following steps of: 1, performing Gaussian filtering preprocessing on the acquired cardiac nuclear magnetic resonance image; 2, computing an external force field of a generalized gradient vector flow based on expansion neighborhood and noise smoothing on the preprocessed image; 3, defining an initialized outline position of the left ventricular endocardium of the heart; 4, segmenting the left ventricular endocardium of the heart; 5, defining a final segmenting outline result of the left ventricular endocardium of the heart into an initialized outline position of the left ventricular epicardium of the heart; 6, setting the boundary strength of an area surrounded by the endocardium outline in an original boundary graph to be 0, recomputing the external force field of the generalized gradient vector flow based onthe expansion neighborhood and the noise smoothing; and 7, segmenting the left ventricular epicardium of the heart. Based on convolution computation, and by taking energy constraint of an elliptical shape, the method for segmenting the cardiac nuclear magnetic resonance image has the advantages of high computing speed, wide capturing range, strong anti-noise ability, excellent performance in weakboundary protection and deep dented region segmentation, and capability of accurately segmenting the left ventricular endocardium and the left ventricular epicardium of the heart.

The impedance waveform reconstructing cardiac output instrument consists of a high frequency constant current source with crystal oscillator, a six-channel impedance detecting circuit, a Z0 temperature correcting circuit, a cardioelectric amplifier, a heart sound amplifier, a timing pulse generator, a A / D converting card, an isolating power source, a computer and corresponding measuring software. It can reconstruct impedance waveform, separate out different impedance components from the mixed impedance signal, draw corresponding waveform figures, measure, calculate, display and print ten cardiac function parameters automatically. The present invention is superior to available automatic cardiac function instrument.

The invention discloses a computer-assisted ultrasonic diagnosis method for a left atrium / left auricle thrombus. The technical scheme includes that data mining technology, a pattern recognition theory and medical clinical information are combined, a gray-scale video and a real-time three-dimensional dynamic video serve as research objects, all-dimensional information in an image is accurately acquired, potential disease association rules in the image information are mined, and multiclass characteristics are comprehensively analyzed to obtain a detection method for automatically detecting and classifying the left atrium / left auricle thrombus. A thrombus recognition method can avoid missed diagnosis and misdiagnosis caused by subjective reasons such as inadequate experience or visual fatigue of doctors, and patients with suspected left atrium / left auricle thrombi clinically detected by transesophageal echocardiography can be confirmed as early as possible, so that the patients without thrombosis can receive cardioversion treatment of atrial fibrillation as early as possible. The method is simple and convenient to operate and high in practicability, and has important guiding significance for diagnosis and treatment of the left atrium / left auricle thrombus and ventricular fibrillation.

The invention discloses a novel left ventricular assist device, which aims to provide periodic pulsation that is closer to the physiological state to assist in pumping blood for patients with heart failure. It includes four parts: blood pump, artificial blood vessel, power supply and control unit, and power supply and control wire. Wherein, the blood pump is a valveless impedance blood pump. There is no valve in the blood pump, the middle section of the blood pump pipeline is an elastic tube, and the two ends of the elastic tube are respectively connected with rigid tubes of the same diameter. The blood pumping function is realized by periodically compressing the elastic tube through the periodic compression component arranged in the blood pump at a position deviated from the axial center of the elastic tube to generate blood flow driving force.

The invention discloses a left heart assisting device which comprises communicated first pipeline and second pipeline, a blade and a drive device, wherein the first pipeline comprises communicated flow-in part and flow-out part; an angle of 5-45 degrees is formed between the first center vertical line of the flow-in end surface of the flow-in part and the second center vertical line of the flow-out end surface of the flow-out part; the second pipeline comprises a flow-in port, a flow-out port and a lap-joint part between the flow-in port and the flow-out port; the flow-in port is detachably connected with the flow-out end surface; the flow area of the lap-joint part is larger than or equal to the flow area of the flow-out port; the blade is rotatably connected with the inside of the flow-out part; the flow-out part comprises a bottom wall opposite to the flow-out end surface; the blade and the drive device are arranged on the two sides of the bottom wall respectively; and the drive device is used for driving the blade to rotate. The left heart assisting device can be arranged in the heart cavity without damaging the heart structure.

The invention discloses a left ventricle auxiliary device. The left ventricle auxiliary device comprises an outer tube, a ventricle side suction component and a discharging section sacculus tube, wherein the outer tube comprises a ventricle section located in the left ventricle and an artery section located in the aorta, first suction meshes are formed in the ventricle section, first discharge meshes are formed in the artery section, and the outer tube is communicated with an external driving device; the ventricle side suction component is arranged in the ventricle section; the two ends of the discharging section sacculus tube are sealed and fixed to the outer wall of the artery section in a sleeved mode, and second discharge meshes are formed in the discharging section sacculus tube, are staggered with the first discharge meshes in position and do not overlap with the first discharge meshes. According to the left ventricle auxiliary device, through suction and pressing of the external driving device, blood is sucked into the outer tube from the left ventricle through the ventricle side suction component, the blood is discharged from the outer tube to the aorta through the discharging section sacculus tube to achieve one cycle, and the blood in the left ventricle is pumped into the aorta. The left ventricle auxiliary device is simple in structure and high in reliability and does not destroy blood cells, and wounds of the body tissues are small.

In a system and method for detecting electrical cardiac events, and a heart stimulator embodying such a system, cardiac events are detected in respective chambers of a heart by sensing electrical signals in at least two different chambers of the heart and forming a difference signal from the sensed signals, and using the difference signal to automatically distinguish between events originating from one of the chambers and events originating in another of the chambers. At least one of the sensed signals is sensed in a coronary vein on the left atrium or the left ventricle.

A left heart vent catheter that includes an elongate tube having a hollow passageway is provided with a plurality of openings and a balloon near the distal end. The balloon can be inflated after the catheter is in place so as to engage a desired part of the heart such as the aortic valve or tricuspid valve and thereby prevent undesired withdrawal of the catheter. The openings near the distal end permit fluid to be withdrawn from the heart through the hollow passageway. After the surgical procedure has been completed, the balloon can be collapsed and the catheter can be withdrawn.

The invention relates to the technical field of medical apparatuses, in particular to a left auricle occlusion device with high adaptability. The left auricle occlusion device comprises an occlusion disc, an anchoring part and a connecting part connected with the occlusion disc and the anchoring part; the left auricle is occluded by the occlusion disc, wherein through the arrangement of a support disc rack and a choke membrane, compared with other occlusion discs weaved by metal, the occlusion disc is smaller in retracted size and lighter in weight, and the choke membrane is used for stopping blood from entering and leaving the left auricle; particularly the design of a cuff is unique, specifically the cuff is arranged on a support ring at the periphery of the support disc rack in a sleeving mode, the cuff is filled with an elastic material during an operation, when the cuff is matched with the left auricle opening, since the cuff filled with the elastic material is good in elasticity and roughness, the irregular shape of the left auricle opening can be adapted to, the left auricle opening is completely occluded, the problem is solved that a traditional occlusion device cannot solve the problem that the left auricle opening is not tightly occluded in different cases, and the hidden danger is thoroughly eliminated that the thrombus is formed at the left auricle part due to atrial fibrillation.

Techniques are provided for assessing left atrial pressure (LAP) based on atrial electrocardiac signal parameters, particularly intra-atrial conduction delay (IACD) and P-wave duration. In one example, a pacemaker or other implantable device senses an intracardiac electrogram (IEGM) or a subcutaneous electrocardiogram (ECG), from which IACD and P-wave duration are derived. The device tracks changes, if any, in the parameters. A significant increase in either IACD or P-wave duration is associated with an increase in LAP. In some examples, conversion factors are calibrated for use with a particular patient to relate IACD and / or P-wave duration values to LAP values to provide an estimate of actual LAP. The conversion factors are pre-calibrated using LAP measurements obtained using a wedge pressure sensor. In other examples, IACD and P-wave duration are instead used to confirm the detection of an elevation in LAP initially made using impedance signals. Other confirmation parameters are described as well.

The invention relates to an asymmetric bidiscoidal left atrial appendage occlusion device, which comprises a left atrium face disc (1), a waist connector (2) and a left atrial appendage face disc face (3), wherein the left atrium face disc (1), the waist connector (2) and the left atrial appendage face disc face (3) have netty structures woven by alloy wires; the left atrium face disc (1) has a disc structure, the disc face is arc-shaped, the circle center of disc face is inward concave, the center of the disc is a disc (4), and the inner seam of the disc is sealed by PTFE a film; the left atrial appendage face disc face (3) is trumpet-shaped; and the left atrium face disc (1) and the left atrial appendage face disc face (3) are connected by the waist connector (2). The alloy wires are made of nickel-titanium alloy. The asymmetric bidiscoidal left atrial appendage occlusion device can solve the problem of treating thrombus caused by auricular fibrillation.

Methods and systems for simulating a phonocardiogram (PCG) signal that includes an anomalous condition are provided. The method generates pressure and flow signals from a lumped-parameter heart model responsive to anomaly parameters. The anomaly parameters represent the anomalous condition. A timing profile or the timing profile and an amplitude profile are extracted from at least one of the generated pressure and flow signals. An anomalous signal is generated using the anomaly parameters and the extracted timing profile or timing profile and amplitude profile. The anomalous signal is time-aligned and combined with a predetermined non-anomalous signal to represent the PCG signal.

The invention discloses a left heart suction device for the cardiac surgery. The left heart suction device comprises a left heart suction tube and a rolling pump used for forming negative pressure in the left heart suction tube. The left heart suction tube comprises a tube body and a suction head. The suction head is provided with a suction hole. The front end of the tube body is connected and communicated with the suction head through a connector, and the connector is provided with a valve hole and a unidirectional air valve mounting on the valve hole. When the negative pressure in the tube body is increased to a set value, the unidirectional air valve is stressed to be switched on so that outside air can enter the tube body. According to the left heart suction device, the blocked suction tube can recover to be smooth conveniently, the damage to the endocardium caused by the blockage of the suction tube by blood blocks is avoided, and operation safety is improved.

The invention relates to a passive thoracic pressure differential pressure artificial heart, wherein the middle chamber of the left heart sac is a left ventricle, and the outer shape of the left heartsac is a special-shaped hollow capsule corresponding to the outer curved surface of the left ventricle. The upper end of the left heart sac is communicated with the left ventricle tube A and the front end of the left ventricular tube A is provided with a mitral valve. The mitral valve is constrained by the left atrial joint in the end of the left ventricular tube A tube and the inner tube of theleft atrial joint. The lower end of the chamber in the left ventricle communicates with the left ventricle tube B, and the rear end of the left ventricular tube B being an aortic valve. The aortic valve being constrained within the end of the left ventricular tube B and the tube of the aortic tube by the aortic tube. The invention has no need of pumping and external power supply and control, and can avoid the fatal complications such as hemolysis, infection and the like.

The invention discloses a positioning device for closing the left aurcle through epicardium loop ligature under intracardiac assistant positioning. The positioning device comprises a positioning cy linder, wherein one end of the positioning cylinder is closed, the other end of the positioning cylinder is open, a pressurization cavity is formed in the cylinder wall of the positioning cylinder, a pressurization connector communicated with the pressurization cavity is arranged at the closed end of the positioning cylinder, and a pressure regulating valve is arranged on the pressurization connector. According to the positioning device for closing the left aurcle through epicardium loop ligature under intracardiac assistant positioning, through an adsorption hole communicated with a decompression cavity, negative pressure is utilized for fixing the positioning cylinder to the left aurcle of the epicardium, and the left aurcle penetrates through a loop ligature coil in a loop ligature line containing groove and stretches into the positioning cylinder; when the pressurization connector pressurizes the pressurization cavity, a pressurization hole and an inner cavity of the positioning cylinder, the loop ligature coil is tightened along with change in pressure of the pressurization cavity, blood stagnating in the left aurcle is squeezed into the ventriculus sinister through pressure intensity, and the problem that when the left aurcle is blocked, thrombi are formed due to blood stasis and abnormal blood flow in the left aurcle is solved.

A transseptal delivery system includes an elongated first tubular member and an elongated second tubular member received within the first tubular member. The first tubular member includes an adjustable portion adjacent its distal end. The second tubular member is adapted to receive an instrument to be placed within the left ventricle and includes an arcuate portion in a relaxed state adjacent its distal end. The adjustable portion can be flexed towards the atrial septum to guide the punch tool and / or guide the insertion of the second tubular member through the septal hole into the left atrium. Within the left atrium, the arcuate portion is oriented toward the left ventricle to guide the insertion of the guidewire into the left ventricle and thereafter the insertion of the second tubular member. Transvenous access to the left ventricle is also provided.