37 results about "Ventricular cavity" patented technology

A minimally invasive approach for surgery on portions of the heart and great vessels. A parasternal incision is made extending across a predetermined number of costal cartilages, e.g., a right parasternal incision extending from the lower edge of the second costal cartilage to the superior edge of the fifth costal cartilage. One or more costal cartilages, e.g., the third and fourth, are then excised to provide access to the portion of the heart or great vessels of interest, for example between a point approximately three centimeters above supra annular ridge and the mid ventricular cavity, and a desired procedure completed. A minimally invasive procedure for repair or replacement of the aortic valve is disclosed that includes making a transverse incision of about 10 cm in length over the second or third intercostal space in the thorax of the patient, dividing the sternum transversely following the incision, retracting the transversely divided sternum, exposing the ascending aorta, and incising the ascending aorta to provide access to an area adjacent the aortic valve.

A device used to treat heart disease by decreasing the size of a diseased heart, or to prevent further enlargement of a diseased heart. The device works by limiting the volume of blood entering the heart during each cardiac cycle. The device partitions blood within the heart, and protects the heart from excessive volume and pressure of blood. The device is placed within the interior of the heart, particularly within a ventricular cavity. The device is a hollow sac, with two openings, which simulates the shape and size of the interior lining of a ventricle of a normal heart. It allows the ventricle to fill through one opening juxtaposed to the annulus of the inflow valve to a predetermined, normal volume, and limits filling of the heart beyond that volume. It then allows blood to be easily ejected through the second opening through the outflow valve. By limiting the amount of blood entering the ventricle, the ventricle is not subjected to the harmful effect of excessive volume and pressure of blood during diastole, the period of the cardiac cycle when the heart is at rest. This allows the heart to decrease in size, or to reverse remodel, and to recover lost function. In some applications, a second device may be simultaneously placed inside the heart to take up excessive space between the heart and the primary device.

A tiny electrically powered hydrodynamic blood pump is disclosed which occupies one third of the aortic or pulmonary valve position, and pumps directly from the left ventricle to the aorta or from the right ventricle to the pulmonary artery. The device is configured to exactly match or approximate the space of one leaflet and sinus of valsalva, with part of the device supported in the outflow tract of the ventricular cavity adjacent to the valve. In the configuration used, two leaflets of the natural tri-leaflet valve remain functional and the pump resides where the third leaflet had been. When implanted, the outer surface of the device includes two faces against which the two valve leaflets seal when closed. To obtain the best valve function, the shape of these faces may be custom fabricated to match the individual patient's valve geometry based on high resolution three dimensional CT or MRI images. Another embodiment of the invention discloses a combined two leaflet tissue valve with the miniature blood pump supported in the position usually occupied by the third leaflet. Either stented or un-stented tissue valves may be used. This structure preserves two thirds of the valve annulus area for ejection of blood by the natural ventricle, with excellent washing of the aortic root and interface of the blood pump to the heart. In the aortic position, the blood pump is positioned in the non-coronary cusp. A major advantage of the transvalvular VAD is the elimination of both the inflow and outflow cannulae usually required with heart assist devices.

A method for cooling of the brain includes the steps of positioning a cooling catheter within a ventricular cavity of the brain, the catheter including an inlet channel and outlet channel providing for the closed flow of cooling fluid into and out of the catheter, and cooling the catheter and ventricular cavity through the closed flow of cooling fluid through the catheter. An alternate method for cooling of the brain including the steps of positioning a cooling catheter within a spinal canal, the catheter including an inlet channel and outlet channel providing for the closed flow of cooling fluid into and out of the catheter, and cooling the catheter and brain through the closed flow of cooling fluid through the catheter.

The disclosure provides methods and apparatus of left ventricular pacing including automated adjustment of a atrio-ventricular (AV) pacing delay interval and intrinsic AV nodal conduction testing. It includes—upon expiration or reset of a programmable AV Evaluation Interval (AVEI)—performing the following: temporarily increasing a paced AV interval and a sensed AV interval and testing for adequate AV conduction and measuring an intrinsic atrio-ventricular (PR) interval for a right ventricular (RV) chamber. Thus, in the event that the AV conduction test reveals a physiologically acceptable intrinsic PR interval then storing the physiologically acceptable PR interval in a memory structure (e.g., a median P-R from one or more cardiac cycles). In the event that the AV conduction test reveals an AV conduction block condition or if unacceptably long PR intervals are revealed then a pacing mode-switch to a bi-ventricular (Bi-V) pacing mode occurs and the magnitude of the AVEI is increased.

The invention relates to a cystic cavity pulmonary circulation assisting device, which comprises a shell, a flow-in tube (6) and a flow-out tube (4), wherein a blood storage cavity (A) and a power cavity (B) are arranged in the shell; the power cavity (B) is used for offering systolic and diastolic power to the blood storage cavity (A); the flow-in tube (6) is arranged on the part, which corresponding to the power cavity (B), of the shell, and the outer end communicates with vana cava while the inner end runs through the power cavity (B) and communicates with the blood storage cavity (A); theflow-out tube (4) is arranged on the part, corresponding to the blood storage cavity (A), of the shell, and the outer end communicates with pulmonary artery while the inner end communicates with the blood storage cavity (A). With the application of the assisting device, a single ventricular cavity can be assisted in pulmonary circulation, and repeated blood extracting and blood pumping actions canbe achieved, so that power required by pulmonary circulation can be offered and blood flow in the human body is close to be normal; and the circulating device is more compact in inner structure and is relatively small in overall volume since the arrangement of the flow-in tube occupies a space in the power cavity; and moreover, the full use of the power of the power cavity can be achieved.

A test bench assembly for simulating cardiac surgery includes a passive heart having at least one pair of cardiac chambers with an atrial chamber and a ventricular chamber. A reservoir is adapted to house working fluid. A pressure generator fluidically connects both to the ventricular chamber of the passive heart and to the reservoir. A pressure regulation device provides working fluid in input to the atrial chamber with preload pressure, and working fluid in output from the ventricular chamber with afterload pressure. The pressure regulation device fluidically connects both to the atrial chamber of the passive heart and to the ventricular chamber of the passive heart. The pressure regulation device has a single compliant element for each pair of cardiac chambers, which provides working fluid with both preload, and afterload pressures.

A temporary pacing lead has an atraumatic curled distal region with multiple cathodes and distal pressure measurement to allow positioning and repositioning within the heart chamber without fluoroscopic or echo guidance. The curled distal region provides definite contact with two opposing walls of the ventricular chamber to ensure electrical signal capture without trauma to the endocardial surface. A stylet located in the pacing lead lumen assists in introducing, placing, and removing the pacing lead from the heart. The flexible distal region provides safe removal of the temporary lead following completion of use.

A ventricular assist assembly, for assisting a heart,includes an anchoring device, a cardiac pump and a stabilizing device. The anchoring device anchors a cardiac pump, is intended to be assembled with an opening in a ventricular wall of the heart, and delimits an internal passage.The cardiac pump is intended to be attached to the anchoring device, is configured for intra-ventricular insertion into the heart, and has a distal end.The cardiac pump extends through the internal passage into the heart when attached to the anchoring device implanted in the opening so that its distal end is placed in a ventricular chamber.The stabilizing device stabilizes the cardiac and includes at least two elongate, biocompatible and flexible connecting members, each elongate connecting member being intended to connect a part of the cardiac pump that is positioned in the ventricular chamber to an internal wall of the ventricular chamber.