CN110624145A

CN110624145A - Artificial heart inlet joint for preventing thrombus in ventricle

Info

Publication number: CN110624145A
Application number: CN201910975295.7A
Authority: CN
Inventors: 高斌; 张琪; 赵大玮; 常宇
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2018-12-29
Filing date: 2019-10-14
Publication date: 2019-12-31
Also published as: CN109701097A

Abstract

An artificial heart inlet joint for preventing thrombus in a ventricle belongs to the field of biomedical engineering. The joint consists of a flow guiding head, a connecting bent pipe and a sewing ring. The drainage head is inserted into the left ventricle, and drainage holes with the same size are uniformly distributed on the surface of the drainage head and are used for uniformly sucking blood from the periphery; the connecting bent pipe is used for connecting the drainage head and the artificial heart body and has physiological bending according to the heart shape; the suture ring is fixed on the outer layer of the connecting elbow and used for suturing the myocardium and fixing the whole joint. The invention can effectively reduce the flow dead zone in the left ventricle and reduce the risk of thrombus in the ventricle on one hand, and the drainage holes can effectively prevent the thrombus in the ventricle from entering the interior of the artificial heart on the other hand, thereby improving the safety of the artificial heart.

Description

Artificial heart inlet joint for preventing thrombus in ventricle

Technical Field

The invention relates to an artificial heart inlet joint for preventing thrombus in a ventricle, belonging to the field of biomedical engineering.

Background

Artificial hearts have become one of the effective methods for treating heart failure, and thrombotic complications arising during use have greatly limited the clinical utility of artificial hearts and the quality of life of patients. The inlet joint of the artificial heart extends into the left ventricle to draw blood. Since the conventional joint has a strong directivity of the suction of blood, a flow dead space is generated between the entrance of the joint and the ventricular wall, thereby inducing thrombosis. On the other hand, because the inlets of the conventional artificial heart joints are all open, thrombus in the ventricle can easily enter the artificial heart along with blood flow, so that the operation failure of the artificial heart is caused. Although the conventional artificial heart inlet joint has the above-mentioned problems, there is no related invention or research to solve the problems.

Disclosure of Invention

The invention aims to design an artificial heart inlet joint for preventing thrombus in a ventricle, and solves the problems in the prior art.

The invention solves the technical scheme that the invention adopts, the invention is an artificial heart inlet joint for preventing thrombus in ventricle, and specifically refer to fig. 1, the artificial heart inlet joint comprises a drainage head (1), a connecting bent pipe (2) and a sewing ring (3), wherein the drainage head (2) is in an expanded hollow ellipsoid shape, drainage hole through holes are uniformly distributed on the surface and are used for uniformly sucking blood from the periphery of the drainage head (2), the drainage head (1) is positioned in the ventricle, one end of the long axis of the drainage head (1) is connected and communicated with one end of the connecting bent pipe (2) in the ventricle and fixed together, and the long axis of the drainage head (1) at the connection part and the central axis of the connecting bent pipe (2) are in the same straight line; the bent angle and the other end of the connecting bent pipe (2) are arranged outside the heart chamber; the joint of the heart chamber outer connecting elbow (2) and the heart chamber wall (4) is provided with a sewing ring (3), the sewing ring (3) is sleeved outside the connecting elbow (2) to form an integral body, and the sewing ring (3) and the heart chamber wall (4) are fixed together to achieve the fixation of the connecting elbow (2) and the heart chamber wall (4).

The contact part of the elbow connecting pipe (2) and the ventricular wall (4) is vertical to the central axis of the elbow connecting pipe (2) and the ventricular wall (4).

The drainage head is made of a titanium alloy material; the bend angle on the connecting bend pipe is a bend angle which is adaptive to the heart anatomical structure and is used for connecting the artificial heart body and the drainage head (1), the material of the bend angle is titanium alloy material, and the bend angle range is 30-90 degrees; the suture ring is fixed on the outer wall of the connecting head and is used for suturing the cardiac muscle, and is an artificial blood vessel material.

On one hand, the device can uniformly suck surrounding blood, so that a flow dead zone in a ventricle is eliminated, and the risk of thrombosis in the ventricle is reduced; on the other hand, the device can effectively prevent and treat that the thrombus that has formed gets into inside the artificial heart, has ensured the security of artificial heart operation.

Drawings

Fig. 1 is an artificial heart inlet connector for preventing thrombus in a ventricle.

1. A drainage head; 2. connecting a bent pipe; 3. a suture ring; 4. the ventricular wall.

Detailed Description

The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.

Example 1

In the artificial heart inlet joint for preventing the thrombus in the ventricle, the drainage head is ellipsoidal, the length of the long axis is 30mm, the length of the short axis is 22mm, the wall thickness is 1mm, the diameter of the drainage hole is 1mm, and the distance between the drainage holes is 0.5 mm; the diameter of the connecting bent pipe is 16mm, the length of the connecting bent pipe is 40mm, and the wall thickness of the bent angle is 50 degrees and 1 mm; the suture ring is made of artificial blood vessel material, and has an inner diameter of 16mm, an outer diameter of 18mm and a height of 2 mm. Through in vitro experiments and animal experiment researches, the joint can uniformly suck blood around the drainage head, and blood flow dead zones in the heart are eliminated; and can effectively prevent thrombus from entering the artificial heart. In vitro test results are as follows, wherein a traditional artificial heart joint is compared with the joint designed in the invention, the pumping speed of the artificial heart in the test is kept at 4L/min, one test point is respectively selected from the upper part, the lower part, the front part, the rear part, the left part and the right part of the joint, the test points are respectively named as a test point 1 to a test point 6, and the blood flow rate in the test process is measured. By comparing the flow rate changes, it is determined whether the design can effectively eliminate the dead zone. The results of the experiments are shown in Table 1.

Claims

1. An artificial heart inlet joint for preventing thrombus in a ventricle is characterized by comprising a drainage head (1), a connecting bent pipe (2) and a sewing ring (3), wherein the drainage head (2) is in an expanded hollow ellipsoid shape, drainage hole through holes are uniformly distributed on the surface of the drainage head and used for uniformly sucking blood from the periphery of the drainage head (2), the drainage head (1) is positioned in the ventricle, one end of the long shaft of the drainage head (1) is connected and communicated with one end of the connecting bent pipe (2) in the ventricle and fixed together, and the long shaft of the drainage head (1) at the connection part and the central shaft of the connecting bent pipe (2) are in the same straight line; the bent angle and the other end of the connecting bent pipe (2) are arranged outside the heart chamber; the joint of the heart chamber outer connecting elbow (2) and the heart chamber wall (4) is provided with a sewing ring (3), the sewing ring (3) is sleeved outside the connecting elbow (2) to form an integral body, and the sewing ring (3) and the heart chamber wall (4) are fixed together to achieve the fixation of the connecting elbow (2) and the heart chamber wall (4).

2. An artificial heart inlet joint for the prevention of intraventricular thrombosis according to claim 1 characterised in that the contact between the elbow (2) and the ventricular wall (4) is such that the central axis of the elbow (2) is perpendicular to the ventricular wall (4).

3. An artificial heart inlet joint for preventing thrombus in a ventricle as recited in claim 1, wherein the drainage head is made of titanium alloy material.

4. An artificial heart inlet joint for preventing thrombus in ventricle as claimed in claim 1, characterized in that the bend angle on the connecting elbow has a bend angle corresponding to the heart anatomy structure for connecting the artificial heart body and the drainage head (1), and the material of the bend angle is titanium alloy material, and the bend angle is in the range of 30-90 °.

5. An artificial heart inlet joint for preventing thrombosis in a chamber as set forth in claim 1, wherein a sewing ring is secured to the outer wall of the connection head for sewing to the myocardium which is an artificial blood vessel material.