Heart septal defect blocking device

Abstract

A heart septal defect occluder, its main body is a metal support net with a preset expanded shape. It has a left plate at the front end and a right plate at the rear end. There is a head near the center of the left and right plates to seal the metal support net and connect it with the metal support net. The head is turned up inside the closed metal support net, and the outer surface of the turned-up head has no head and no obvious groove, which is almost flat. There is a layer of outflow blocking film on the outer surface of the left disk or the left and right disks, and the flow blocking film is fixedly connected with the outer surface of the left disk. The invention removes the damage of the head to the surrounding tissues of the heart, reduces the way of affecting blood flow, is beneficial to promote the growth of the endothelium, and reduces the formation rate of thrombus and the release of harmful metal elements. Applicable to congenital heart disease including patent foramen ovale (PFO), patent ductus arteriosus (PDA), atrial septal defect (ASD) and ventricular septal defect (VSD), etc.

Description

technical field [0001] The invention relates to a medical device, in particular to a heart septal defect occluder for treating congenital heart disease. Background technique [0002] Congenital heart disease includes patent ductus arteriosus (PDA), patent foramen ovale (PFO), atrial septal defect (ASD) and ventricular septal defect (VSD). PDA may flow blood between the aorta and pulmonary artery, PFO and ASD may flow blood between the left atrium and right atrium, and VSD may flow blood between the left ventricle and right ventricle. More flow usually requires repair . At present, various types of cardiac septal defect occlusion devices are used for the treatment of congenital heart diseases. These occlusion devices are sent to specific locations in the patient's heart through catheters or wires through the femoral vein or jugular vein. [0003] Several mechanical occlusion devices have been proposed in the past for occluding congenital heart defects. Among them, the wide...

AI Technical Summary

Problems solved by technology

However, the heads of the left and right disks of the metal support mesh protrude outside the left and right disks of the metal support mesh 1, as shown in Figures 1A, 1B, 1C, and 1D; so that the left disk head 4 of the occluder will enter the aorta in a protruding state (for PDA) , left atrium (for PFO, ASD) and left ventricle (for VSD), the head may touch or damage the surrounding tissues (such as the left pulmonary vein ostium of the left atrium, the coronary sinus ostium, the aortic valve of the left ventricle and other heart inner structure), causing serious injury; because the head 4 and the head 5 are outside the metal support net 1, in order to reduce the damage of the head to the surrounding tissue of the heart, some of the heads are retracted into a preset groove, Even if there is a groove, in the freely expanded state, the head is in the groove, but when the left disc of the occluder is just released from the sheath tube 8, the head will still protrude, as shown in Figure 1E, and the groove can only It is made for the PDA occluder with a large gap between the left and right discs, but it cannot be made for the VSD occluder with a gap of only about 2mm between the left disc 2 and the right disc 3. Therefore, it does not fundamentally solve the hazard of the protruding head, but The grooves in the disk may affect the way blood flows

At the same time, it is difficult to accurately determine the size and shape of the defect hole under the existing technical conditions and operating methods. Due to the limitation of the waist size, it is more difficult for doctors to choose the type of occlusion device. If the size is too large, the waist of the occluder will be blocked. Compression of the heart compartment makes the left and right disks bulge into a gourd shape, making the head outside the metal support net more prominent, which may touch the surrounding tissues and cause serious consequences

In addition, there is a flow-blocking film inside the metal support net, and the entire metal support net of the left and right discs is completely exposed to the blood, which is likely to cause the formation of thrombus and the release of harmful metal elements, which will affect the surgical effect.

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