47 results about "Mechanical heart" patented technology

Suturing rings and methods of use thereof facilitating initial implantation of new and replacement of dysfunctional tissue or mechanical heart valve mechanisms supported by the suturing ring are disclosed. The suturing ring annulus is adjustable to receive and engage the valve frame of the heart valve mechanism within the annulus. An interlocking mechanism applies restraint to fix the adjusted suturing ring annulus engaged against the valve frame to support the heart valve mechanism during chronic implantation. Sutures affixing the suturing ring to the valvar rim can be routed and entrapped between the suturing ring annulus and the valve frame when the suturing ring is restraint is applied. The restraint is released to replace a dysfunctional heart valve mechanism and reapplied when a new heart valve mechanism is fitted into the annulus.

Improved, adaptable tissue-type heart valves and methods for their manufacture are disclosed wherein a dimensionally stable, pre-aligned tissue leaflet subassembly is formed and its peripheral edge clamped between and attached to an upper shaped wireform and a lower support stent. A variety of adaptable structural interfaces including suture rings, flanges, and conduits may be attached to the support stent with or without an outlet conduit disposed about the wireform to provide a tissue-type heart valve adaptable for use in either a natural heart or in mechanical pumping devices. The methods include forming individual leaflets with a template and using the template to attach the leaflets together to form a tissue leaflet subassembly. The template and leaflets include a straight edge terminating in oppositely directed tabs, and a curvilinear cusp edge extending opposite the straight edge. The template may include a guide slot in its straight edge and the assembly includes aligning two leaflet tabs with the template and passing sutures through the guide slot and through the leaflet tabs. The leaflet subassembly is mated to a wireform with the tabs extending through commissure posts of the wireform. A support stent having an upper surface matching the lower surface of the wireform sandwiches the edges of the leaflet subassembly therebetween. Separated tabs on the leaflet subassembly are passed through the wireform commissures and attached to adjacent stent commissures so as to induce clamping of the leaflet tabs between the stent commissures and wireform commissures upon a radially inward force being applied to the leaflets.

A method of operating a cardiac pacing device that optimizes the mechanical heart rate using coordinated potentiation therapy while maximizing the opportunity for intrinsic AV conduction to occur. The method may include adjusting the timing of extra stimulus intervals during coupled or paired pacing to promote AV conduction and to effect changes in rate according to certain embodiments of the invention. Other embodiments may include adjusting the atrial pacing rate to achieve a desired target rate consistent with AV conduction. A mode switch to a dual-chamber pacing mode may be provided according to certain embodiments of the invention to ensure a ventricular rate that meets or exceeds a minimum mechanical rate.

Techniques are provided for evaluating mechanical dyssynchrony within the heart of patient in which a pacemaker, implantable cardioverter-defibrillator (ICD) or other medical device is implanted. In one example, a set of cardiogenic impedance signals are detected along different sensing vectors passing through the heart of the patient, particularly vectors passing through the ventricular myocardium. A measure of mechanical dyssynchrony is detected based on differences, if any, among the cardiogenic impedance signals detected along the different vectors. In particular, differences in peak magnitude delay times, peak velocity delay times, peak magnitudes, and waveform integrals of the cardiogenic impedance signals are quantified and compared to detect abnormally contracting segments, if any, within the heart of the patient. Warnings are generated upon detection of any significant increase in mechanical dyssynchrony. Diagnostic information is recorded for clinical review. Pacing therapies such as cardiac resynchronization therapy (CRT) can be activated or controlled in response to mechanical dyssynchrony to improve the hemodynamic output of the heart.

The invention discloses a mechanical heart blood pump which boosts blood pressure steps by steps, pertaining to the technical field of biomedical engineering, relating to a mechanical heart blood pump for boosting blood pressure. The mechanical heart blood pump comprises a driving stator and a rotor; a controller connected with a driving stator provides a driving power source; the driving stator composed of annular coils is located in an interlayer composed of a cylindrical shell 13 and a tubular cavity 10; a supporting rotor comprises a head guide vane 1 and a tail guide vane 8; the head guide vane 1 is arranged in the front end of the tubular cavity 10, the tail guide vane 8 is arranged in the rear end of the tubular cavity 10 and a rotor between the head guide vane 1 and the tail guidevane 8 is also arranged in the tubular cavity 10. The mechanical heart blood pump is characterized in that: the mechanical heart blood pump is divided into a front grade and a rear grade, wherein, the front grade is a Grade 1 blood pump and the rear grade is a Grade 2 blood pump; the Grade 1 blood pump and the Grade 2 blood pump are respectively driven by the controller. The blood firstly flows through the Grade 1 blood pump to generate a blood pressure and then flows through the Grade 2 blood pump to generate another blood pressure; the two blood pressures are overlaid to reach a blood pressure needed by the human body, thus avoiding the problem that red blood cells are injured by the rotational speed increase of an impeller when a single blood pump works to obtain a relatively high blood pressure.

The invention relates to a blood pump for assisting blood flow in the heart, in particular to an artificial heart blood pump with magnetic and fluid dynamic pressure hybrid suspension, which comprisesa casing 7 sleeved on an inner shell 9; wherein the casing comprises a motor stator 8 and the inner shell 9 comprises a head support component 1, a rotor component and a rear support component 15. The blood bump is characterized in that the rotor component, the head support component 1 and the rear support component 15 are arranged in the cylindrical inner shell 9; the rotor component is arrangedbetween the head support component 1 the rear support component 15; wherein a head blood dynamic pressure suspension cone bearing 2 is positioned at the central head support component 1; the rotor component comprises a head blood dynamic pressure suspension cone 3, an impeller 6, a rear permanent magnet bearing inner ring 10 and a rear blood dynamic pressure suspension cone 13 in series; a rear blood dynamic pressure suspension cone bearing 14 is arranged at the central rear support component 15 and a rear permanent magnet bearing external ring 12 is embedded on the outside of the bearing. The blood pump has the advantages of low shearing force of the blood, less damage to blood erythrocytes and decreased hemolysis.

A mechanical heart valve implantable as heart valve replacement comprising of an annular valve body with a central orifice and an exterior surface incorporating a suture ring having a plurality of suture tunnels, and a valve implantation flap assembly disposed on the valve body surface and wrapping around the suture ring. The inside lumen carries the occluder mechanism. The valve holder comprises of at least two parts, both parts having suture guiding grooves on the outer surface corresponding to and matching with the tunnels on the suture ring, such as to form a continuous path for the sewing material. The parts of the valve holder can be detached separately from the valve after taking all the sutures, the part on the ventricular side before lowering the valve into the heart and the other part after lowering and positioning the heart valve in the; desired position inside the heart.

The various embodiments disclosed herein relate to combination heart assist systems, methods, and devices that include both an electrical therapy device and a mechanical heart assist device. Various operational modes can be implemented using these embodiments, including a synchronized pacing mode, an internal CPR mode, and an internal workout mode.