CN216168099U

CN216168099U - Heart assisting device for treating diastolic heart failure

Info

Publication number: CN216168099U
Application number: CN202122447439.7U
Authority: CN
Inventors: 柳光茂; 胡盛寿
Original assignee: Yuanshen Shenzhen Medical Instrument Co ltd
Current assignee: Yuanshen Shenzhen Medical Instrument Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-04-05
Anticipated expiration: 2031-10-11

Abstract

The utility model discloses a heart assist device for treating diastolic heart failure, which is provided with an elastic spring; the elastic spring is a closed loop structure consisting of a plurality of upper fixing rings, a plurality of lower fixing rings and spring wires which are respectively arranged between the corresponding upper fixing rings and the corresponding lower fixing rings; the elastic spring has the functions of folding and self-expanding, the expanded shape in the expanded state is matched with the shape of the inner wall of the ventricle, and the outer diameter determined by the spring wire in the shape is slightly larger than the maximum inner diameter of the corresponding position of the inner wall of the ventricle in the end diastole. The heart auxiliary device can be compressed to the size of implantation through a catheter when being implanted, is attached to the inner wall of a heart chamber after being implanted, has an elastic self-expansion function, and does not need an external power source; the device is squeezed by the inner wall of the ventricle to store a small amount of elastic energy during systole, and the elastic energy is released to the inner wall of the ventricle through self-expansion outward expansion force during diastole, so that the diastole function and the filling performance of the ventricle are assisted.

Description

Heart assisting device for treating diastolic heart failure

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a heart auxiliary device for treating diastolic heart failure.

Background

Diastolic heart failure is a group of clinical syndromes in which, in the case of normal or mild ventricular systolic function, the active relaxation of the ventricular muscles is impaired and the cardiac muscle compliance is reduced, resulting in a reduction in ventricular filling, a reduction in stroke volume and an increase in end-diastolic pressure, leading to congestion in the pulmonary and systemic circulation. Mechanism of diastolic dysfunction: one is active diastolic dysfunction, the other is diastolic heart failure caused by compliance decline and filling disorder of ventricular muscle, mainly including hypertensive cardiomyopathy, hypertrophic cardiomyopathy, senile heart disease and diabetes, myocardial amyloidosis, restrictive cardiomyopathy and endocardial fibrosis, atrial septal defect, pulmonary hypertension and acute pulmonary embolism, constrictive pericarditis, massive pericardial effusion, ventricular tachycardia, etc.

Ventricular systolic function in diastolic heart failure is generally normal, by which is generally meant that the Left Ventricular Ejection Fraction (LVEF) > 40% -50%, but strictly speaking diastolic heart failure has incorporated some degree of systolic heart failure when LVEF < 50%. Research shows that the simple diastolic heart failure accounts for 20-60% of the heart failure patients, while the rest of the heart failure patients show the comprehensive heart failure of diastolic heart failure under the condition of different degrees of systolic heart failure.

Ventricular filling disorders are characteristic of diastolic heart failure and are characterized hemodynamically by a reduction in left ventricular volume and an increase in end diastolic pressure, with a normal or mild decrease in ejection fraction. The conventional artificial heart of ventricular assist type is mostly used for enhancing the contraction function of the heart and is not suitable for treating diastolic heart failure, so the utility model of the special heart assist device for treating diastolic heart failure has important significance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a heart auxiliary device for treating diastolic heart failure, which is suitable for diastolic heart failure with preserved ejection fraction, is specially designed for enhancing the diastolic function of heart failure patients, and can be implanted through the apex of the heart or through a percutaneous minimally invasive way.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a heart assist device for diastolic heart failure treatment has an elastic spring which is a closed loop structure composed of a plurality of upper fixing rings, a plurality of lower fixing rings, and spring wires respectively disposed between the corresponding upper fixing rings and lower fixing rings;

the elastic spring has the functions of folding and self-expanding, the expanded shape in the expanded state is matched with the shape of the inner wall of the ventricle, and the outer diameter determined by the spring wire in the shape is slightly larger than the maximum inner diameter of the corresponding position of the inner wall of the ventricle in the end diastole.

Preferably, the diameter of the opening surrounded by the plurality of upper fixing rings in the elastic spring is larger than the diameter of the opening surrounded by the plurality of lower fixing rings.

Preferably, the plurality of upper fixing rings and the plurality of lower fixing rings are equal in number and are uniformly arranged.

Preferably, the number of the upper fixing rings and the lower fixing rings is 3-6 respectively.

Preferably, the upper fixing ring and the lower fixing ring of the spring are integrally formed with the wire.

The utility model has the beneficial effects that:

the heart auxiliary device can be compressed to the size of implantation through a catheter when being implanted, is attached to the inner wall of a heart chamber after being implanted, has an elastic self-expansion function, and does not need an external power source; the device is squeezed by the inner wall of the ventricle to store a small amount of elastic energy during systole, and the elastic energy is released to the inner wall of the ventricle through self-expansion outward expansion force during diastole, so that the diastole function and the filling performance of the ventricle are assisted.

Aiming at diastolic dysfunction, the cardiac assist device can improve cardiac output by improving oxygenated blood, reduce left ventricular diastolic pressure causing pulmonary congestion, does not need a power supply so as not to need maintenance, reduces surgical risks by minimally invasive implantation, and has wide application scenes.

The heart auxiliary device is implanted in a minimally invasive way, no in-vivo and in-vitro connecting lines cause infection, the relaxing heart failure is effectively relieved or reversed, and the heart failure can be relieved or reversed after long-term application.

Drawings

Fig. 1 is a schematic structural view of a heart assist device according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of a heart assist device according to a first embodiment of the present invention in a folded state.

Fig. 3 is a schematic structural view of a heart assist device according to a second embodiment of the present invention.

Fig. 4 is a schematic structural view of a heart assist device according to a second embodiment of the present invention in a folded state.

Fig. 5 is a schematic structural view of a heart assist device according to a third embodiment of the present invention.

Fig. 6 is a schematic structural view of a heart assist device according to a third embodiment of the present invention in a folded state.

Fig. 7 is a schematic view of the heart assist device according to the first embodiment of the present invention after being implanted in the left ventricle.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

The utility model relates to a diastole auxiliary device which is a spring type device and is made of elastic metal materials with good biocompatibility. The heart assist device has an elastic spring that is a closed loop structure composed of a plurality of upper fixing rings, a plurality of lower fixing rings, and spring wires respectively disposed between the corresponding upper fixing rings and lower fixing rings. As a connection manner between the upper fixing rings, the lower fixing rings and the spring wires, for example, each upper fixing ring may be connected to two adjacent lower fixing rings by a spring wire, and each lower fixing ring may be connected to two adjacent upper fixing rings by a spring wire. The elastic spring has the functions of folding and self-expanding, the shape of the outer contour of the expanded elastic spring is matched with the shape of the inner wall of the ventricle, and the outer diameter determined by the spring wire in each part is slightly larger than the maximum inner diameter of the corresponding position of the inner wall of the ventricle in the end diastole. By "slightly larger" is meant that the spring is minimally assured of conforming to the inner wall of the ventricle throughout the cardiac cycle. The diameter of an opening formed by a plurality of upper fixing rings in the elastic spring is larger than that of an opening formed by a plurality of lower fixing rings. The number of the upper fixing rings is equal to that of the lower fixing rings, and the upper fixing rings and the lower fixing rings are evenly arranged. The specific number of the upper fixing ring and the lower fixing ring is not particularly limited, and may be, for example, 3 to 6, or 6 or more. The spring may be formed by integrally forming the upper fixing ring, the lower fixing ring and the spring wire, for example, integrally formed by a complete spring wire by a spring processing and rolling process. The material of the bracket-type elastic spring includes, but is not limited to, titanium alloy, 316L stainless steel, elastic alloy with good biocompatibility, and the like.

As shown in fig. 1, as a first embodiment of the present invention, the elastic spring is composed of three upper fixing rings 11, three lower fixing rings 12, and spring wires 13 connecting the upper fixing rings 11 and the lower fixing rings 12, respectively, and 6 spring wires 13 connect the upper fixing rings 11 and the lower fixing rings 12 into a closed loop structure. Fig. 1 shows the structure of the spring in an expanded state (natural state, self-expanded state), in which the overall profile of the spring includes an upper opening surrounded by three upper fixing rings 11, a lower opening surrounded by three lower fixing rings 12, and a convex support formed by 6 spring wires 13. The shape of the overall contour of the spring in this state matches the shape of the inner wall of the ventricle, with the upper opening being located near the aortic valve and corresponding to the upper part of the ventricle, and the lower opening being located near the apex of the heart and corresponding to the lower part of the ventricle.

As shown in fig. 3, as a second embodiment of the present invention, the elastic spring is composed of four upper fixing rings 21, four lower fixing rings 22, and spring wires 23 connecting the upper fixing rings 21 and the lower fixing rings 22, respectively, and 8 spring wires 23 connect the upper fixing rings 21 and the lower fixing rings 22 into a closed loop structure. Fig. 2 shows the structure of the spring in the expanded state (natural state, self-expanded state), in which the overall contour of the spring includes an upper opening surrounded by four upper fixing rings 21, a lower opening surrounded by four lower fixing rings 22, and a convex support formed by 8 spring wires 23. The shape of the overall contour of the spring in this state matches the shape of the inner wall of the ventricle, with the upper opening being located near the aortic valve and corresponding to the upper part of the ventricle, and the lower opening being located near the apex of the heart and corresponding to the lower part of the ventricle.

As shown in fig. 5, as a third embodiment of the present invention, the elastic spring is composed of six upper fixing rings 31, six lower fixing rings 32, and spring wires 33 connecting the upper fixing rings 31 and the lower fixing rings 32, respectively, and the upper fixing rings 31 and the lower fixing rings 32 are connected in a closed loop structure by 12 spring wires 33. Fig. 3 shows the structure of the spring in the expanded state (natural state, self-expanded state), in which the overall profile of the spring includes an upper opening surrounded by six upper fixing rings 31, a lower opening surrounded by six lower fixing rings 32, and a convex support formed by 12 spring wires 33. The shape of the overall contour of the spring in this state matches the shape of the inner wall of the ventricle, with the upper opening being located near the aortic valve and corresponding to the upper part of the ventricle, and the lower opening being located near the apex of the heart and corresponding to the lower part of the ventricle.

The elastic spring has the folding and self-expanding functions, and is a structural schematic diagram of the second and third embodiments of the utility model in a folded state, as shown in fig. 2, 4 and 6. The folded elastic spring has small size, so that the elastic spring can be compressed and folded when being implanted, is accommodated in a delivery device such as a delivery catheter with the diameter of about 6mm and is delivered into the left ventricle by a percutaneous or transapical minimally invasive implantation mode; after the spring is released from the delivery device into the left ventricle, the spring sets into a stretched state by self-expanding.

Fig. 7 is a schematic view showing a state in which the heart assist device according to the first embodiment of the present invention is implanted in the left ventricle. The positions of the left ventricle 2, the right ventricle 3, the right atrium 4 and the left atrium 5 in the heart are simply marked in the figure, and the stent type elastic spring 2 in the left ventricle 2 is in an expanded state. Under the state, the elastic spring contracts under the action of the inward extrusion force of the inner wall of the ventricle when the heart contracts, and expands outwards to assist the diastole of the ventricle when the heart relaxes, so that the cardiac output is improved, and the diastolic pressure of the left ventricle is reduced.

Specifically, since the size of the outer contour of the stent-type elastic spring in the expanded state is larger than the maximum size of the end-diastolic ventricular wall, the upper fixing rings 11 and the lower fixing rings 12 which are uniformly arranged are attached to the inner wall of the left ventricle 2, the lower fixing rings 12 are attached to the inner wall of the left ventricle 2 at positions close to the apex of the heart, the upper fixing rings 11 are attached to the inner wall of the left ventricle 2 at positions close to the aortic valve, and the outward-protruding elastic spring wire 13 is attached to the inner wall of the left ventricle 2 in the whole cardiac cycle. The size of the outer contour of the elastic spring in a natural state is slightly larger than the maximum size of the inner wall of the ventricle in the end diastole, so that the elastic spring is always in a contraction state of bearing the extrusion of the inner wall of the ventricle in the left ventricle, when the ventricle contracts, the elastic spring is further compressed to store elastic energy, and when the ventricle relaxes, the elastic spring releases the elastic energy, so that the diastole of the ventricle is assisted.

Finally, it should be understood that the above-mentioned embodiments are not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heart assist device for the treatment of diastolic heart failure, characterized in that the heart assist device has an elastic spring; the elastic spring is a closed loop structure consisting of a plurality of upper fixing rings, a plurality of lower fixing rings and spring wires which are respectively arranged between the corresponding upper fixing rings and the corresponding lower fixing rings;

2. A heart assist device for diastolic heart failure treatment according to claim 1, wherein the spring has an opening surrounded by a plurality of upper retaining rings with a larger diameter than an opening surrounded by a plurality of lower retaining rings.

3. A heart assist device for diastolic heart failure treatment according to claim 1 or 2, wherein the plurality of upper fixation rings and the plurality of lower fixation rings are equal in number and evenly arranged.

4. A heart assist device for diastolic heart failure treatment according to claim 3, wherein the number of the plurality of upper fixing rings and the number of the plurality of lower fixing rings are 3-6, respectively.

5. A heart assist device for the treatment of diastolic heart failure as in claim 1 or 2, wherein the upper and lower fixing rings of the spring are integrally formed with the wire.