JP2010220833A - Ventricle prosthesis - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventricle prosthesis which is mounted without undergoing thoracotomy, as a first-aid treatment till performing a surgical operation, and protects weakened cardiac muscles. <P>SOLUTION: The ventricle prosthesis 1 is mounted onto the ventricle of a heart 101 when complications such as tamponage are concurred with acute myocardial infarction etc., and includes: a flexible bag shape diaphragm 2 having an opening 2a at one end; and a shape holding part 3 for holding the diaphragm 2 in an open state in a normal situation. The diaphragm 2 is formed in a semi-elliptical shape with the opening 2a at the center of a longitudinal axis. The shape holding part 3 is configured to be linearly compression-deformable. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a ventricular prosthesis that is quickly attached to the heart, such as when the ventricle is torn.

  One heart disease is acute myocardial infarction. Acute myocardial infarction is a disease in which the supply of blood is interrupted due to sudden occlusion of the coronary arteries that send blood to the heart muscle that forms the heart, resulting in necrosis of the heart muscle. Occlusion is mainly caused by clogging of blood vessels and blood clots in blood vessels. If acute myocardial infarction loses systolic function over a wide area of the myocardium or a lethal arrhythmia such as ventricular fibrillation occurs, the heart may be unable to eject blood and sudden death may occur.

  For example, FIG. 1A shows the heart 101 of a patient who has developed acute myocardial infarction. First, the heart 101 includes a left atrium 102, a left ventricle 103, a right atrium 104, and a right ventricle 105. A tricuspid valve 106 and a mitral valve 107 are provided between the left and right atriums 102 and 104 and the ventricles 103 and 105, respectively, and the atrium 102 and 104 and the ventricles 103 and 105 are partitioned to be opened and closed. ing. The left and right atriums 102 and 104 are partitioned by an atrial septum 108, and the left and right ventricles 103 and 105 are partitioned by a ventricular septum 109, respectively. With respect to the heart 101 having such a structure, venous blood around the whole body enters the right atrium 104 through the vena cava 110, passes through the tricuspid valve 106 and the right ventricle 105, and is sent to the lungs by the pump action of the heart 101. . Arterial blood returning from the lungs enters the left atrium 102, passes through the mitral valve 107 and the left ventricle 103, and is sent to the whole body through the aorta 111 by the pump action of the heart 101 as indicated by the arrow line.

  Although not shown, there are a plurality of coronary arteries in question, and each extends from the base of the aorta 111 toward the apex 101a so as to surround the heart 101. Therefore, although the site where the occlusion occurs varies, the site where the myocardium is necrotized (also referred to as the necrotic site 112) is the apex 101a of the heart 101 located on the distal side of the coronary artery as shown by the mesh line in FIG. Tend to occur on the side. Since the myocardium at the necrosis site 112 becomes fragile, various complications occur in combination with acute myocardial infarction.

  For example, as shown in (b) of the figure, when the free wall of the ventricle breaks, ventricular rupture occurs and arterial blood is ejected out of the ventricle. Since the heart 101 is covered with the bag-like pericardium 113, the ejected arterial blood accumulates in the pericardium 113 and causes a “cardiac tamponade” that compresses the heart 101. Also, as shown in (c) of the figure, when the ventricular septum 109 breaks down and a hole is opened, a “ventricular septal perforation” is caused, and a large amount of arterial blood flows into the right ventricle 105, and the right ventricle 105 becomes large. It will put a burden. In either case, there is a risk of acute heart failure or cardiac arrest.

  Regarding the present invention, stent grafts used for the treatment of aortic aneurysms are known (Patent Documents 1, 2, etc.). For example, Patent Document 2 discloses a stent graft in which a shape memory alloy wire is entangled in a mesh shape to form a cylindrical shape, and a graft such as an artificial tube is integrally covered.

  In order to improve the ejection fraction of the heart of a patient suffering from congestive heart failure, a partition device that partitions the left ventricle into a productive part and a non-productive part has been proposed (Patent Documents 3 and 4). This compartment device has a funnel-like appearance, and has a stem whose tip is formed in a J-shape, a plurality of ribs extending radially from the base end of the stem, and a conical compartment membrane attached to these ribs. It has. The tip of each rib is pointed. The compartment device is folded and introduced into the patient's left ventricle through the catheter. When the partition device is expanded at a predetermined position, the distal end of the rib is stuck and fixed in the heart tissue, so that the left ventricle is partitioned by the partition film.

JP 2008-200743 A JP 2004-344634 A Special table 2007-517596 Special table 2008-545510 gazette

  When acute myocardial infarction develops and complications such as cardiac tamponade and ventricular septal perforation occur, the lifesaving rate decreases rapidly over time. Need to be sutured to stop bleeding.

However, even if the diagnosis is confirmed by cardiac catheterization, at least several hours are required before the treatment is completed after the actual operation, such as patient transportation and preparation for surgery. Meanwhile, arterial blood continues to flow out of the ventricle, and the patient is in a state of strong congestive heart failure. Severe invasion can bother the patient and cause organ damage. In addition, in order to reduce the state of the cardiac tamponade shown in FIG. 1 (b), a treatment (pericardial drainage) is performed by inserting a tube from the chest wall surface into the pericardial 110 to extract blood, but there is a hole in the ventricle. Blood keeps coming out.
The present invention has been made in view of such a point, and an object of the present invention is to provide a ventricular prosthesis that can be subjected to first aid relatively easily and can prevent rapid deterioration of the disease state until surgery is performed. It is to provide.

  In order to achieve the above object, the present invention has been devised so that it can be treated relatively easily and in a short time using a catheter, and the outflow of arterial blood from the ventricle can be restrained urgently.

  That is, the present invention is a ventricular prosthesis mounted in the heart chamber of the heart, and is provided with a flexible bag-shaped diaphragm having an opening at one end and the diaphragm, and the diaphragm is normally opened. The diaphragm portion is formed in a semi-ellipsoidal shape having the opening on the center side of the major axis, and the shape retaining portion is configured to be linearly deformable.

  According to the ventricular prosthesis having such a configuration, since the diaphragm portion is formed in a semi-ellipsoidal shape similar to the shape around the apex of the ventricle, when the ventricular prosthesis is mounted in the ventricle It is easy to adhere to the inner wall. Since the diaphragm part is flexible, it can be shrunk small, and the shape-retaining part can also be linearly compressed and deformed, so that the ventricular prosthesis can be accommodated and transported inside a catheter or the like. In the normal state, that is, in the normal state where no external force is applied, the diaphragm part is held open by the shape-retaining part, so that the ventricular prosthesis is automatically expanded by simply pushing it out of the catheter or the like in the ventricle. Mounted on the inner wall.

  Therefore, since the ventricular prosthesis can be mounted simply by feeding it into the ventricle of the heart using a catheter or the like and pushing it out, it is not necessary to open the chest and the operation is relatively simple, so that the treatment can be performed in a short time. Since the diaphragm part is attached to the entire myocardium (including the normal part) around the apex of the ventricle, the necrotic part is reinforced, and the breakdown and the outflow of arterial blood can be reduced. Since the shape retaining portion can also be compressed and deformed, the heart pumping function can be maintained.

  Specifically, the shape-retaining portion is made of an annular member formed to be shrinkable in the circumferential direction using an elastically deformable linear member, and is provided along the edge of the opening. can do.

  By forming the shape-retaining portion using a linear member, it is easy to compress and deform linearly and its total volume becomes small, so that it can be smoothly transferred by a catheter or the like. By making the shape retaining portion an annular member that can contract in the circumferential direction, the diaphragm portion can be easily adhered to the inner wall of the ventricle without obstructing the pumping action of the heart. By providing the ventricular prosthesis along the edge of the opening of the diaphragm part, the diaphragm part can be firmly opened, and the diaphragm part can be prevented from rising due to the arterial flow.

  More specifically, the shape retaining portion has a plurality of straight branch arm portions, and one end of two adjacent branch arm portions are connected to each other so as to be elastically bendable and formed in a wavy shape. You can do it. According to such a configuration, the shape retaining portion can be greatly contracted in the circumferential direction while being simple, and excellent in elasticity.

  Further, an auxiliary shape-retaining portion having the same form as the shape-retaining portion may be further provided, and one or more auxiliary shape-retaining portions may be provided on the apex side of the diaphragm portion. .

  By doing so, since the diaphragm part is held in a semi-ellipsoidal shape, the diaphragm part can easily adhere to the inner wall of the ventricle, and the weakened myocardium can be firmly protected.

  The shape-retaining portion is composed of, for example, a plurality of elastically deformable linear members formed in a semi-elliptical shape, and these linear members are each integrally attached to the diaphragm portion and combined radially. It may be a thing.

  In this case, each linear member is formed in a semi-elliptical shape according to the shape of the diaphragm part, and is attached to the diaphragm part integrally and is combined radially, so that the diaphragm part is easily held in a semi-ellipsoidal shape. It can protect the weakened myocardium firmly. The structure is simple and advantageous in terms of manufacturing cost and member cost, and the volume occupied by the shape-retaining portion is reduced, which facilitates the transfer with the catheter.

  In particular, it is preferable to pass a thread-like member from one end of the edge of the opening to the other end.

  If it does so, the opening amount of the opening of a diaphragm part can be controlled with a thread-like member. By adjusting the opening amount, it becomes possible to cope more appropriately with hearts having different sizes, and it is not necessary to apply a burden to the hearts. Further, when the ventricular prosthesis is displaced or tilted at the time of attachment, the attachment state can be easily corrected by picking the thread-like member.

  Further, the shape retaining portion may be constituted by a plurality of linear members that can be elastically deformed, and each of these linear members may be passed through the opening and combined radially.

  In this case, since the linear members are passed into the opening and combined radially, the opening can be held more firmly in the open state. Since the structure is simplified, it is advantageous in terms of manufacturing cost and member cost. Since the volume occupied by the shape retaining portion at the time of compressive deformation is reduced, it is easy to transport. Furthermore, even if there is no thread-like member, the attachment position of the ventricular prosthesis can be easily corrected by picking the linear member.

  As described above, according to the ventricular prosthesis of the present invention, it can be mounted in the ventricle in a relatively short time without opening the chest when the diagnosis is confirmed, and the weakened myocardium can be protected quickly. it can. It becomes possible to prevent a rapid deterioration of the disease state until the surgical operation is performed, and the lifesaving rate in the surgical operation can be improved.

It is a figure for demonstrating acute myocardial infarction and its complication. (A) shows a heart with acute myocardial infarction, (b) shows a heart with cardiac tamponade, and (c) shows a heart with ventricular septal perforation. It is a schematic perspective view of the ventricular prosthesis of this embodiment. (A) represents the normal state, and (b) represents the contracted state. It is a figure for demonstrating operation which attaches a ventricular prosthesis to a ventricle. It is a figure for demonstrating operation which attaches a ventricular prosthesis to a ventricle. (A), (b) represents the main stage of operation, respectively. It is a figure for demonstrating operation which attaches a ventricular prosthesis to a ventricle. (A), (b) represents the main stage of operation, respectively. It is a figure which shows the state which mounted | wore the ventricle with the ventricular prosthesis. It is a figure for demonstrating operation which corrects the mounting state of a ventricular prosthesis. It is a schematic perspective view which shows the modification of a ventricular prosthesis. (A) represents the normal state, and (b) represents the contracted state. It is a schematic perspective view which shows the modification of a ventricular prosthesis. (A) represents the normal state, and (b) represents the contracted state.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

(Ventricular prosthesis)
In FIG. 2, the ventricular prosthesis 1 of this embodiment is shown. The ventricular prosthesis 1 is provided with a bag-shaped diaphragm portion 2 having an opening 2 a at one end, a shape retaining portion 3, and an auxiliary shape retaining portion 4. As shown in (a) of the figure, the ventricular prosthesis 1 has a three-dimensional shape with an open mouth in a normal state (normal state) where no external force is applied, and when pressed, (b) in the figure. As shown in FIG. 4, the tube can be inserted into a catheter or the like after being compressed and deformed into an elongated linear shape.

  The diaphragm part 2 is formed in the semi-ellipsoid shape which the center side of a long axis opens using the sheet-like raw material. This shape is formed in accordance with the shape of the ventricle at the apex 101a side, and when the ventricular prosthesis 1 is attached to the apex 101a in the ventricle, the diaphragm 2 is in close contact with the inner wall of the myocardium. The weakened myocardium can be firmly protected from the inside. The length dimension of the diaphragm 2 on the long axis side, the opening diameter, and the like can be arbitrarily set according to the size of the heart 101.

  As the material of the diaphragm part 2, since it is relatively easy to mold, a synthetic resin such as polyester, polyethylene, or polypropylene can be suitably used. The diaphragm part 2 may be formed by integral molding, or may be formed three-dimensionally by joining one or more members. However, the material is preferably flexible and thin so that the material can be shrunk small. In order to reduce the load on the myocardium, the material is preferably low in elasticity and excellent in strength. Further, those having no blood permeability or extremely small ones are preferable.

  The shape-retaining portion 3 is formed of an annular member formed using a thin linear member (also referred to as a linear member 3a) made of elastically deformable metal or synthetic resin. The linear member 3a is formed so as to extend in a wavy line in the circumferential direction, and can be contracted in the circumferential direction. Specifically, the shape retaining portion 3 has a plurality of linear branch arm portions 3b, 3b,... Positioned at regular intervals in the circumferential direction, and the branch arm portions 3b, 3b,. The two branch arm portions 3b and 3b are connected to each other so as to be elastically bendable with each other.

  Accordingly, when the shape retaining portion 3 is compressed and contracted so that the adjacent branch arm portions 3b and 3b are in contact with each other, the shape retaining portion 3 is elongated and elastically deformed into a linear shape as shown in FIG. To do. The shape retaining portion 3 is integrally provided on the inner side so as to follow the edge of the opening 2a of the diaphragm portion 2, and easily contracts when an external force is applied from the outside in the radial direction to urge the diaphragm portion 2 in the opening direction. It has a function.

  An auxiliary shape retaining portion 4 is provided adjacent to the shape retaining portion 3 on the pointed end 2 b side of the diaphragm portion 2. The auxiliary shape retaining portion 4 has the same form as the shape retaining portion 3 except that the diameter dimension is smaller than that of the shape retaining portion 3. That is, the auxiliary shape retaining portion 4 is also formed in an annular shape by an elastically deformable wavy linear member 4a, and a plurality of branch arm portions 4b, 4b,... have. In the present embodiment, one auxiliary shape retaining portion 4 is provided, but two or more auxiliary shape retaining portions 4 may be provided. However, at the point 2b of the diaphragm part 2, the protective region where only the diaphragm part 2 exists so that the linear member 4a does not concentrate and break through the diaphragm part 2 when contracted and transported through the catheter. 2c is preferably provided.

  A thread-like member 5 is provided in the opening 2 a of the ventricular prosthesis 1. This thread member 5 is a thin thread member formed using a non-stretchable or low stretchable material. The thread-like member 5 is passed from a predetermined end of the edge portion of the opening 2a in the diaphragm portion 2 to the other opposite end. In the present embodiment, a plurality of thread-like members 5 are provided, and the thread-like members 5 are radially arranged so as to overlap each other at the center of the opening 2a.

(How to wear a ventricular prosthesis)
Next, a method for mounting the ventricular prosthesis 1 having such a configuration will be described. FIG. 3 is a schematic diagram showing the main part of the human body. For example, it is assumed that acute myocardial infarction is recognized as a result of examination by cardiac catheter test, and it has been diagnosed as having a cardiac tamponade. In that case, the pathological condition worsens over time, and the lifesaving rate rapidly decreases, so it is necessary to immediately perform an emergency surgical operation.

  However, if there is no equipment to perform such a surgical operation, the patient must be transported to a well-equipped facility, and even with the equipment, it takes time to prepare for surgery, so the diagnosis is confirmed. Even so, treatment is not always possible. Meanwhile, arterial blood continues to flow out of the ventricles, and the patient is in a state of strong congestive heart failure, and severe invasion can cause damage to the patient and cause organ damage.

  Therefore, in order to protect the weakened myocardial necrosis site 112 and reduce the outflow of arterial blood from the ventricle until the surgical operation is performed, the ventricular prosthesis 1 is attached to the left ventricle 103 using the catheter 51 or the like. Attach to. First, the patient's groin is incised, and the guide wire 52 is fed to the central side through the femoral vein 114 and inserted into the right atrium 104 of the heart 101. As a device for attaching the ventricular prosthesis 1 to the ventricle, a device for percutaneous transvenous mitral valve commissure (PTMC) generally used in the treatment of mitral stenosis can be used.

  As shown in FIG. 4A, the atrial septum 108 is pierced by the puncture needle 55 that has been fed into the right atrium 104 using the guide wire 52 as a guide, and the distal end portion of the guide wire 52 is fed into the left atrium 102. The catheter 51 is fed along the guide wire 52, and is fed until the distal end portion of the catheter 51 reaches the vicinity of the apex 101a in the left ventricle 103 via the mitral valve 107, as shown in FIG. . A series of operations for sending the catheter 51 into the left ventricle 103 may be performed by an X-ray fluoroscopic guide. However, since the mitral valve 107 and the like cannot be seen by the X-ray fluoroscopic guide, a transesophageal echocardiography (TEE) guide is used. Is preferred.

  As shown in FIG. 5A, the ventricular prosthesis 1 that has been compressed and deformed linearly from the proximal end portion of the catheter 51 whose distal end portion has been sent into the left ventricle 103 is thus pointed 2b of the diaphragm portion 2. The ventricular prosthesis 1 is fed to the central side by operating the rod 53 from the side. As shown in (b) of the figure, when the ventricular prosthesis 1 is pushed out from the distal end of the catheter 51, the ventricular prosthesis 1 is automatically expanded by the action of the auxiliary shape-retaining part 4 and the shape-retaining part 3. When the entire ventricular prosthesis 1 is pushed out, the area around the apex 101a of the left ventricle can be covered from the inside by the ventricular prosthesis 1 as shown in FIG.

  As described above, the ventricular prosthesis 1 can be mounted simply by pushing it into the ventricle using the catheter 51 or the like, so that an emergency treatment can be performed immediately after the diagnosis is confirmed without performing thoracotomy.

  Since the shape of the diaphragm portion 2 is formed in accordance with the shape around the apex portion 101a to be attached, the internal pressure is received over the relatively large region of the left ventricle 103 including the normal region, and the weakened myocardium The necrotic site 112 can be protected. Since the opening amount of the opening 2a of the diaphragm part 2 can also be regulated by the thread-like member 5, it can be finely adjusted according to the individual heart 101, and the diaphragm part 2 can be mounted appropriately. Since the shape retaining portion 3 and the auxiliary shape retaining portion 4 that hold the ventricular prosthesis 1 in an open state can be compressed and deformed, the pump function of the heart 101 is maintained. Moreover, since the shape retaining portion 3 and the like contract while urging the diaphragm portion 2 in the opening direction, the more the heart 101 contracts to send out arterial blood, the more the shape retaining portion 3 and the auxiliary shape retaining portion 4 It adheres well. Therefore, it is possible to effectively suppress arterial blood from leaking between the diaphragm portion 2 and the ventricular wall.

  In this way, the original function of the heart 101 can be maintained and exerted without imposing a large load on the myocardial necrosis site 112, so that rapid deterioration of the pathological condition can be prevented until surgery is performed. . In addition, what is necessary is just to take out the ventricular prosthesis 1 with which the left ventricle 103 was mounted | worn at the time of a surgical operation.

  By the way, when the ventricular prosthesis 1 is pushed out from the catheter 51, there is a possibility that the ventricular prosthesis 1 is tilted or displaced and cannot be properly mounted. In such a case, the mounting state of the ventricular prosthesis 1 can be corrected using the thread-like member 5. For example, as shown in FIG. 7, an instrument 54 having forceps at the distal end may be fed through a catheter 51, the instrument may be operated to pick up the thread-like member 5, and the mounting state of the ventricular prosthesis 1 may be corrected. Since the thread-like member 5 is stretched inside the opening 2a, it can be easily picked and treated in a short time.

  The ventricular prosthesis 1 according to the present invention is not limited to the above-described embodiment, and includes various other configurations.

  For example, FIG. 8 shows a modification of the ventricular prosthesis. The ventricular prosthesis 1A is provided with a shape-retaining portion (also referred to as a second shape-retaining portion 3A) having a different form that exhibits the same function as the shape-retaining portion 3 and the auxiliary shape-retaining portion 4. Except for the second shape retaining portion 3A, the configuration is the same as that of the above-described embodiment. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

  The second shape retaining portion 3A is composed of a plurality of linear members 30, 30,... The material of each linear member 30 is the same as that of the said embodiment. Each linear member 30 is integrally attached to the diaphragm part 2 so as to be along the inner peripheral surface of the diaphragm part 2. The bent middle portions of the respective linear members 30 are positioned so as to overlap with the pointed ends 2b of the diaphragm part 2, and the linear members 30 are combined so as to expand radially from the major axis direction of the diaphragm part 2.

  Therefore, the ventricular prosthesis 1 is normally held in an open state as shown in (a) of the figure. When the ventricular prosthesis 1 is crushed from the radial direction, each linear member 30 is greatly elastically deformed at the intermediate portion thereof, so that the second The shape retaining portion 3A is compressed and deformed into a linear shape, and can be inserted into the catheter 51 or the like. Of course, when the external force disappears, the second shape retaining portion 3A expands and returns to its original state.

  In this case, since the diaphragm part 2 is easily held in a semi-ellipsoidal shape, the diaphragm part 2 can be attached so as to be in close contact with the left ventricle 103. The structure is simple and advantageous in terms of manufacturing cost and member cost. Since the volume occupied by the linear member 30 is also relatively small, the inside of the catheter 51 can be easily transferred.

  FIG. 9 shows another modification of the ventricular prosthesis. This ventricular prosthesis 1B is also provided with a different shape-retaining portion (also referred to as a third shape-retaining portion 3B) that exhibits the same function as the shape-retaining portion 3 and the auxiliary shape-retaining portion 4.

  The third shape retaining portion 3B is composed of a plurality of linear members 31, 31,. Also in this modification, the material of each linear member 31 is the same as that in the above embodiment. Each linear member 31 is provided in the diaphragm part 2 so as to cross between the opposing end parts in the edge part of the opening 2a in a state where the protruding side faces the inside of the diaphragm part 2. The intermediate portions of the linear members 31 are positioned so as to overlap the central portion of the opening 2a, and the linear members 31 are combined so as to expand radially from the long axis direction of the diaphragm portion 2.

  Therefore, the ventricular prosthesis 1 is normally held in an open state as shown in (a) of the figure. When the ventricular prosthesis 1 is crushed from the radial direction, each linear member 31 is greatly elastically deformed at the intermediate portion thereof, so that the third The shape-retaining portion 3B is compressed and deformed into a linear shape and can be inserted into the catheter 51 and the like. Of course, when the external force disappears, the third shape retaining portion 3B expands and returns to its original state.

  In this case, since the linear member 31 is passed through the opening 2a and combined in a radial manner, the opening 2a can be held more firmly. The structure is simple and advantageous in terms of manufacturing cost and member cost. Since the volume occupied by the linear member 31 is also relatively small, the catheter 51 can be easily transferred. Moreover, since the linear member 31 can be picked, the mounting position of the ventricular prosthesis 1 can be easily corrected.

DESCRIPTION OF SYMBOLS 1 Ventricular prosthesis 2 Diaphragm part 2a Opening 2b Point 3 Shape retaining part 3a Linear member 3b Branch arm part 4 Auxiliary shape retaining part 5 Filamentous member

Claims (7)

A ventricular prosthesis mounted in the heart's ventricle,
A flexible bag-shaped diaphragm having an opening at one end;
A shape-retaining part that is provided in the diaphragm part and normally holds the diaphragm part in an open state;
With
The diaphragm is formed in a semi-ellipsoid shape having the opening on the center side of the long axis,
A ventricular prosthesis in which the shape retaining portion is configured to be linearly compressible. The ventricular prosthesis of claim 1,
The ventricular prosthesis, wherein the shape-retaining part is formed of an annular member that is formed to be contractible in the circumferential direction using a linear member that can be elastically deformed, and is provided along the edge of the opening. A ventricular prosthesis according to claim 2,
A ventricular prosthesis in which the shape retaining portion has a plurality of linear branch arm portions, and one end of two adjacent branch arm portions are connected to each other so as to be elastically bendable. A ventricular prosthesis according to claim 2 or claim 3,
An auxiliary shape retaining portion having the same shape as the shape retaining portion;
A ventricular prosthesis in which one or more auxiliary shape-retaining parts are provided on the apex side of the diaphragm part. The ventricular prosthesis of claim 1,
The ventricular prosthesis comprising a plurality of elastically deformable linear members in which the shape-retaining portion is formed in a semi-elliptical shape, and these linear members are each integrally attached to the diaphragm portion and radially combined. . A ventricular prosthesis according to any one of claims 1 to 5,
A ventricular prosthesis in which a thread-like member is passed from one end to the other end of the edge of the opening. The ventricular prosthesis of claim 1,
A ventricular prosthesis in which the shape-retaining portion is composed of a plurality of linear members that can be elastically deformed, and each of these linear members is passed through the opening and combined radially.

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