Vascular anastomosis device

Abstract

To provide a vascular anastomosis device capable of appropriately mixing blood of the vena cava superior and of the vena cava inferior.SOLUTION: A vascular anastomosis device (10) has: a first inlet pipe (1) anastomosed by the vena cava superior; a second inlet pipe (2) anastomosed by the vena cava inferior; a mixing chamber (5) which is connected to the first inlet pipe and the second inlet pipe, has an inner width larger than an inner diameter of the first inlet pipe and an inner diameter of the second inlet pipe, and has an inner wall recessed inward; and a first outlet pipe (3) and a second outlet pipe (4) connected to the mixing chamber.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vascular anastomosis device. [Background technology]

[0002] There are many types of congenital heart disease surgery that require optimization of pulmonary blood flow. Among these, the type known as functional single ventricle, in which maintaining adequate pulmonary blood flow has a particularly significant impact on the patient's prognosis and lifelong quality of life.

[0003] A functional single ventricle is a complex heart disease in which there is only one ventricle that functions normally. In normal anatomy, there are two ventricles: the right ventricle, which is responsible for pulmonary circulation, and the left ventricle, which is responsible for systemic circulation (systemic circulation), and they have separate functions. However, patients with a functional single ventricle only have one ventricular function (i.e., the pumping function that sends blood out), so the main goal of treatment is to perform anatomical repair surgery so that this function can function as a systemic circulatory system.

[0004] In patients with a functional single ventricle, some of the blood returning from the systemic circulation is re-circulated into the systemic circulation without passing through the lungs. The Fontan procedure is used to treat this condition. The Fontan procedure connects the superior and inferior vena cava to the right and left pulmonary arteries without passing through the heart.

[0005] Patent documents 1 to 4 disclose devices for controlling blood flow used in the Fontan procedure. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5665748 [Patent Document 2] Patent No. 6861461 [Patent Document 3] Patent No. 7393339 [Patent Document 4] US Patent Application Publication No. 2023 / 0381488 Summary of the Invention [Problem to be solved by the invention]

[0007] Blood in the superior vena cava and blood in the inferior vena cava may differ in oxygen concentration, carbon dioxide concentration, blood flow rate, etc. It is preferable for blood in the superior vena cava and inferior vena cava to flow balanced between the right and left pulmonary arteries. However, it is difficult to precisely control blood flow. Depending on the condition of the vascular anastomoses after the Fontan procedure, for example, more blood from the inferior vena cava may flow into the left pulmonary artery than into the right pulmonary artery.

[0008] On the other hand, the above-mentioned conventional techniques cannot sufficiently mix the blood in the superior vena cava and the inferior vena cava before sending it to the right pulmonary artery and the left pulmonary artery.

[0009] An object of one aspect of the present invention is to provide a vascular anastomosis device that can appropriately mix blood from the superior vena cava and the inferior vena cava and deliver it to the right pulmonary artery and the left pulmonary artery. [Means for solving the problem]

[0010] A vascular anastomosis device according to a first aspect of the present invention comprises a first inlet pipe anastomosed to the superior vena cava, a second inlet pipe anastomosed to the inferior vena cava, a mixing chamber connected to the first inlet pipe and the second inlet pipe, the mixing chamber having an inner width larger than the inner diameter of the first inlet pipe and the inner diameter of the second inlet pipe and having an inner wall that is concave inward in a certain cross section, a first outlet pipe connected to the mixing chamber and anastomosed to the right pulmonary artery, and a second outlet pipe connected to the mixing chamber and anastomosed to the left pulmonary artery.

[0011] A vascular anastomosis device according to a second aspect of the present invention may be configured in the above-mentioned first aspect such that, in a cross section passing through the first inlet pipe and the second inlet pipe, the inner wall of the mixing chamber is concave inward.

[0012] A vascular anastomosis device according to a third aspect of the present invention comprises a first inlet pipe anastomosed to the superior vena cava, a second inlet pipe anastomosed to the inferior vena cava, a rotating mixing chamber connected to the first inlet pipe and the second inlet pipe and having an inner diameter larger than the inner diameters of the first inlet pipe and the second inlet pipe, a first outlet pipe connected to the mixing chamber and anastomosed to the right pulmonary artery, and a second outlet pipe connected to the mixing chamber and anastomosed to the left pulmonary artery.

[0013] The vascular anastomosis device according to a fourth aspect of the present invention may be configured in any one of the first to third aspects, such that blood circulates inside the mixing chamber along the inner wall of the mixing chamber.

[0014] A vascular anastomosis device according to a fifth aspect of the present invention may be configured in any one of the first to fourth aspects, wherein the mixing chamber is spherical or cylindrical.

[0015] A vascular anastomosis device according to a sixth aspect of the present invention is any one of the first to fifth aspects, wherein the mixing chamber has a protrusion on the inner wall that protrudes inward.

[0016] A vascular anastomosis device according to a seventh aspect of the present invention is any one of the first to sixth aspects, wherein the mixing chamber has a partially recessed recess on the inner wall.

[0017] A vascular anastomosis device according to aspect 8 of the present invention may be configured in any of aspects 1 to 7 above, further comprising a confluence pipe through which the blood from the first inlet pipe and the blood from the second inlet pipe merge and flow into each other, and the first inlet pipe and the second inlet pipe are connected to the mixing chamber via the confluence pipe.

[0018] A vascular anastomosis device according to a ninth aspect of the present invention may be configured in the above-mentioned eighth aspect such that the confluence pipe is connected to the mixing chamber toward a position offset from the center of the mixing chamber.

[0019] A vascular anastomosis device according to a tenth aspect of the present invention may be configured in the above ninth aspect such that the confluence pipe is connected to the mixing chamber so as to extend along the inner wall of the mixing chamber.

[0020] The vascular anastomosis device of aspect 11 of the present invention may be configured such that, in any of aspects 8 to 10 above, the angle between the direction in which blood flows from the first inlet pipe into the confluence pipe and the direction in which blood flows from the second inlet pipe into the confluence pipe is an acute angle.

[0021] A vascular anastomosis device according to aspect 12 of the present invention may be configured such that, in any of aspects 1 to 7 above, the first inlet pipe is connected to the mixing chamber at a position offset to one side from the center of the mixing chamber, and the second inlet pipe is connected to the mixing chamber at a position offset to the other side from the center of the mixing chamber.

[0022] A vascular anastomosis device according to a thirteenth aspect of the present invention is any one of the above first to twelfth aspects, wherein the first outlet pipe or the second outlet pipe may have a plurality of branch outlet pipes.

[0023] A vascular anastomosis device according to aspect 14 of the present invention may be configured in any of aspects 1 to 13 above, further comprising a third inlet pipe connected to the mixing chamber and anastomosed to one of the plurality of superior vena cavae. [Effects of the Invention]

[0024] According to one aspect of the present invention, blood from the superior vena cava and the inferior vena cava can be appropriately mixed and delivered to the right pulmonary artery and the left pulmonary artery. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view showing the configuration of a vascular anastomosis device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing the configuration of the vascular anastomosis device. [Figure 3] FIG. 2 is a side view showing the configuration of the vascular anastomosis device. [Figure 4] FIG. 2 is a top view showing the configuration of the vascular anastomosis device. [Figure 5] FIG. 5 is a perspective cross-sectional view showing the configuration of the vascular anastomosis device taken along the cutting line AA in FIG. 4. [Figure 6] 1 is a perspective view showing the configuration of a vascular anastomosis device according to one embodiment of the present invention. [Figure 7] FIG. 2 is a front view showing the configuration of the vascular anastomosis device. [Figure 8] FIG. 2 is a side view showing the configuration of the vascular anastomosis device. [Figure 9] 1 is a perspective view showing the configuration of a vascular anastomosis device according to one embodiment of the present invention. [Figure 10] 3A to 3C are three-view diagrams showing the configuration of the vascular anastomosis device. [Figure 11] 11 is a cross-sectional view showing the configuration of the vascular anastomosis device taken along the cutting line BB in FIG. 10. FIG. [Figure 12] 1 is a perspective view showing the configuration of a vascular anastomosis device according to one embodiment of the present invention. [Figure 13] 3A to 3C are three-view diagrams showing the configuration of the vascular anastomosis device. [Figure 14] 14 is a cross-sectional view showing the configuration of the vascular anastomosis device taken along the cutting line CC in FIG. 13. FIG. [Figure 15] 1 is a cross-sectional view showing the configuration of a vascular anastomosis device according to one embodiment of the present invention. [Figure 16] 1 is a front view showing the configuration of a vascular anastomosis device according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] [Embodiment 1] FIG. 1 is a perspective view showing the configuration of a vascular anastomosis device 10 of this embodiment. FIG. 2 is a front view showing the configuration of the vascular anastomosis device 10. FIG. 3 is a side view showing the configuration of the vascular anastomosis device 10. FIG. 4 is a top view showing the configuration of the vascular anastomosis device 10. FIG. 5 is a perspective cross-sectional view showing the configuration of the vascular anastomosis device 10 taken along the cutting line AA in FIG. 4.

[0027] The vascular anastomosis device 10 includes a first inlet pipe 1, a second inlet pipe 2, a first outlet pipe 3, a second outlet pipe 4, and a mixing chamber 5. The vascular anastomosis device 10 is a device that is placed inside the body during the Fontan procedure and connects the patient's superior vena cava, inferior vena cava, right pulmonary artery, and left pulmonary artery to each other. The vascular anastomosis device 10 is formed from a material used for artificial blood vessels, such as a resin, a biological material, or a material made from autologous tissue.

[0028] The first inlet tube 1 is a tube that is anastomosed to the superior vena cava. The second inlet tube 2 is a tube that is anastomosed to the inferior vena cava. The inner diameters of the first inlet tube 1 and the second inlet tube 2 may be any size as long as they can be sutured to a blood vessel.

[0029] The first outlet tube 3 is a tube that is anastomosed to the right pulmonary artery. The second outlet tube 4 is a tube that is anastomosed to the left pulmonary artery. The inner diameter of the first outlet tube 3 and the inner diameter of the second outlet tube 4 may be the same or may be different depending on the patient.

[0030] The mixing chamber 5 is connected to a first inlet pipe 1, a second inlet pipe 2, a first outlet pipe 3, and a second outlet pipe 4. The mixing chamber 5 has a hollow chamber that mixes the blood from the first inlet pipe 1 and the blood from the second inlet pipe 2. The mixing chamber 5 has a chamber in the shape of a body of revolution. A body of revolution is a solid formed by rotating a plane figure. The plane figure may be, for example, a rectangle, a circle, or an ellipse. For example, the mixing chamber 5 may have the shape of a body of revolution with an axis perpendicular to the axis of the first inlet pipe 1 or the second inlet pipe 2 as its axis of rotation. Here, the mixing chamber 5 has a spherical chamber. However, the mixing chamber 5 is not limited to this, and may have a cylindrical or ellipsoidal shape.

[0031] The inner diameter of the mixing chamber 5 is larger than the inner diameters of the first inlet pipe 1 and the second inlet pipe 2. Within the mixing chamber 5, flows other than those directly directed toward the first outlet pipe 3 and the second outlet pipe 4 are generated. These flows are flows that remain within the mixing chamber 5 for a certain period of time before heading toward the first outlet pipe 3 or the second outlet pipe 4. Therefore, blood flowing in from the first inlet pipe 1 and the second inlet pipe 2 is mixed within the mixing chamber 5. Furthermore, because the mixing chamber 5 has the shape of a rotating body, the flow of blood flowing in from the first inlet pipe 1 and the second inlet pipe 2 is regulated by the shape of the rotating body, suppressing turbulence. The rotating shape of the mixing chamber 5 reduces resistance, allowing the blood to flow smoothly. This reduces energy loss in the blood flow and suppresses increases in blood pressure. Furthermore, the mixing chamber 5 efficiently mixes the blood flowing in from the first inlet pipe 1 and the second inlet pipe 2 as it flows along the shape of the rotating body. In this way, the blood flowing in from the first inlet tube 1 and the second inlet tube 2 is mixed in the mixing chamber 5 and then delivered to the first outlet tube 3 and the second outlet tube 4. Therefore, the vascular anastomosis device 10 can appropriately mix the blood in the superior vena cava and the inferior vena cava and deliver it to the right pulmonary artery and the left pulmonary artery.

[0032] The mixing chamber 5 has one or more protrusions 6 that protrude inward on its inner wall. Here, the mixing chamber 5 has multiple protrusions 6 on its inner wall. The protrusions 6 may be shaped like a part of a sphere (a spherical crown), such as a hemisphere. However, the shape of the protrusions 6 is not limited to this. By having the protrusions 6 in the mixing chamber 5, an irregular flow can be generated in the blood flowing along the inner wall of the mixing chamber 5. This can promote mixing of the blood flowing in from the first inlet pipe 1 and the second inlet pipe 2.

[0033] Furthermore, the vascular anastomosis device 10 does not require a structure that is supported by beams or the like and placed in the space inside the mixing chamber 5. Therefore, the vascular anastomosis device 10 has a structure that is less likely to break down.

[0034] (Variation) The mixing chamber 5 may have one or more partially recessed recesses on its inner wall. The recesses have an inwardly concave shape. The presence of recesses in the mixing chamber 5 can also cause irregular flow of blood along the inner wall of the mixing chamber 5. The mixing chamber 5 may have one or both of the protrusions 6 and the recesses.

[0035] The shape of the mixing chamber 5 is not limited to the shape of a rotor. The mixing chamber 5 may have an inner width larger than the inner diameter of the first inlet pipe 1 and the inner diameter of the second inlet pipe 2, and may have an inner wall that is concave inward in a certain cross section. Because the inner wall of the mixing chamber 5 is concave inward, flows other than those toward the first outlet pipe 3 and the second outlet pipe 4 are generated inside the mixing chamber 5. Therefore, the blood that flows in from the first inlet pipe 1 and the second inlet pipe 2 circulates within the mixing chamber 5 and is mixed.

[0036] For example, the inner wall of the mixing chamber 5 may be concave inward in a cross section passing through the first inlet pipe 1 and the second inlet pipe 2. This provides a space suitable for mixing the blood flowing in from the first inlet pipe 1 and the second inlet pipe 2.

[0037] Note that the fact that the inner wall is concave inward does not mean that it does not have partial protrusions 6. The inner wall of the mixing chamber 5 may have an inward concave shape as a whole, and one or more protrusions 6 may be provided on the inner wall.

[0038] The extending directions of the first inlet pipe 1, the second inlet pipe 2, the first outlet pipe 3, and the second outlet pipe 4 can be changed as appropriate depending on the positions of the patient's superior vena cava, inferior vena cava, right pulmonary artery, and left pulmonary artery. For example, the first inlet pipe 1 and the second inlet pipe 2 may be provided asymmetrically with respect to the center of the mixing chamber 5. The first outlet pipe 3 and the second outlet pipe 4 may be provided asymmetrically with respect to the center of the mixing chamber 5.

[0039] [Embodiment 2] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0040] Fig. 6 is a perspective view showing the configuration of the vascular anastomosis device 10a of this embodiment, Fig. 7 is a front view showing the configuration of the vascular anastomosis device 10a, and Fig. 8 is a side view showing the configuration of the vascular anastomosis device 10a.

[0041] In some patients with a functional single ventricle, the superior vena cava may be divided into multiple branches. The vascular anastomosis device 10a is a device that accommodates such an anomaly. The vascular anastomosis device 10a includes a first inlet tube 1, a second inlet tube 2, a third inlet tube 7, a first outlet tube 3, a second outlet tube 4, and a mixing chamber 5. The first inlet tube 1 is a tube that is anastomosed to one of the multiple superior vena cavae. The third inlet tube 7 is a tube that is anastomosed to another of the multiple superior vena cavae. The third inlet tube 7 is connected to the mixing chamber 5. The arrangement of the first inlet tube 1 and the third inlet tube 7 may be changed depending on the patient. The inner diameter of the second inlet tube 2 may be larger than the inner diameters of the first inlet tube 1 and the third inlet tube 7.

[0042] [Embodiment 3] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0043] Figure 9 is a perspective view showing the configuration of the vascular anastomosis device 10b of this embodiment. Figure 10 is a three-view diagram showing the configuration of the vascular anastomosis device 10b. In Figure 10, 1001 indicates a front view, 1002 indicates a side view, and 1003 indicates a top view. Figure 11 is a cross-sectional view showing the configuration of the vascular anastomosis device 10b taken along the cutting line BB in Figure 10. In Figure 11, arrows indicate the flow of blood.

[0044] The vascular anastomosis device 10b comprises a first inlet pipe 1, a second inlet pipe 2, a first outlet pipe 3, a second outlet pipe 4, a mixing chamber 5, and a junction pipe 8. The first inlet pipe 1 and the second inlet pipe 2 are connected to the junction pipe 8. The junction pipe 8 is connected to the mixing chamber 5. The junction pipe 8 is formed so as to be wound helically around the spherical mixing chamber 5. The second inlet pipe 2 extends along the junction pipe 8 on the outside of the junction pipe 8. The second inlet pipe 2 extends so as to be partially wound around the junction pipe 8, extending to the side of the mixing chamber 5 where the first inlet pipe 1 is located. The first inlet pipe 1 and the second inlet pipe 2 are connected to the mixing chamber 5 via the junction pipe 8.

[0045] The inner diameter of the mixing chamber 5 may be larger than the inner diameter of the first inlet pipe 1 , the inner diameter of the second inlet pipe 2 , and the inner diameter of the junction pipe 8 .

[0046] The blood in the first inlet pipe 1 and the blood in the second inlet pipe 2 join together and flow into the confluence pipe 8. The second inlet pipe 2 extends around to the side of the first inlet pipe 1, which is located on the opposite side of the mixing chamber 5. The first inlet pipe 1 and the second inlet pipe 2 are connected to the confluence pipe 8 so that the angle between the direction in which the blood flows from the first inlet pipe 1 into the confluence pipe 8 and the direction in which the blood flows from the second inlet pipe 2 into the confluence pipe 8 is acute. This reduces the resistance of the flow path, thereby reducing the load on the superior vena cava or inferior vena cava.

[0047] The blood from the first inlet pipe 1 and the blood from the second inlet pipe 2 that have flowed into the junction pipe 8 mix in the junction pipe 8 and flow into the mixing chamber 5. The junction pipe 8 is connected to the mixing chamber 5 at a position offset from the center of the mixing chamber 5. The center of the mixing chamber 5 is on the central axis of the rotating body shape of the mixing chamber 5. For example, the blood that has flowed into the mixing chamber 5 circulates inside the mixing chamber 5 in a vortex shape.

[0048] Furthermore, the confluence pipe 8 is connected to the mixing chamber 5 so as to run along the inner wall of the mixing chamber 5. The blood that flows into the mixing chamber 5 from the confluence pipe 8 flows along the inner wall of the mixing chamber 5. Therefore, the blood circulates in the mixing chamber 5 and is thoroughly mixed. The mixed blood is delivered from the first outlet pipe 3 and the second outlet pipe 4 provided on the left and right sides of the mixing chamber 5. Therefore, the vascular anastomosis device 10b can appropriately mix the blood in the superior vena cava and the inferior vena cava and deliver it to the right pulmonary artery and the left pulmonary artery.

[0049] (Variation) It is to be noted that it may be the first inlet pipe 1 that wraps around the periphery of the mixing chamber 5. The first inlet pipe 1 and the second inlet pipe 2 may be interchanged. Also, the junction pipe 8 may be connected directly to the mixing chamber 5 without wrapping around the periphery of the mixing chamber 5.

[0050] [Embodiment 4] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0051] Fig. 12 is a perspective view showing the configuration of the vascular anastomosis device 10c of this embodiment. Fig. 13 is a three-view diagram showing the configuration of the vascular anastomosis device 10c. In Fig. 13, 2001 indicates a front view, 2002 indicates a side view, and 2003 indicates a top view. Fig. 14 is a cross-sectional view showing the configuration of the vascular anastomosis device 10c taken along the cutting line CC in Fig. 13. In Fig. 14, arrows indicate the flow of blood.

[0052] The vascular anastomosis device 10c includes a mixing chamber 5c instead of the mixing chamber 5 of the vascular anastomosis device 10b of embodiment 3. The mixing chamber 5c has a cylindrical shape with a central axis perpendicular to the axis of the first inlet pipe 1 or the second inlet pipe 2. The connecting portions of the mixing chamber 5c with the first outlet pipe 3 and the second outlet pipe 4 have, for example, a truncated cone shape.

[0053] Junction pipe 8 is connected to mixing chamber 5c toward a position shifted from the center of mixing chamber 5c. Furthermore, junction pipe 8 is connected to mixing chamber 5c so as to extend along the inner wall of mixing chamber 5c.

[0054] In the vascular anastomosis device 10c, the cylindrical mixing chamber 5c mixes the blood from the first inlet tube 1 and the blood from the second inlet tube 2 while rotating and circulating along the inner wall of the cylinder. Therefore, the vascular anastomosis device 10c can appropriately mix the blood in the superior vena cava and the inferior vena cava and deliver it to the right pulmonary artery and the left pulmonary artery.

[0055] (Variation) The central axis of the cylindrical shape of the mixing chamber 5c may be oriented in any direction.

[0056] [Embodiment 5] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0057] FIG. 15 is a cross-sectional view from the side (the side where the second outlet pipe 4 is located) showing the configuration of a vascular anastomosis device 10d of this embodiment. The vascular anastomosis device 10d includes a first inlet pipe 1, a second inlet pipe 2, a first outlet pipe 3, a second outlet pipe 4, and a mixing chamber 5. Unlike the vascular anastomosis device 10 of Embodiment 1, the first inlet pipe 1 and the second inlet pipe 2 of the vascular anastomosis device 10d are not connected toward the center C of the mixing chamber 5. In other words, the center C of the mixing chamber 5 is not located in the region E on the extension of the first inlet pipe 1 and the second inlet pipe 2. The center C of the mixing chamber 5 is located on the central axis of the rotational shape. In the configuration shown in FIG. 15, the central axis of the rotational shape is located at the position of the first outlet pipe 3.

[0058] The first inlet pipe 1 is connected to the mixing chamber 5 at a position offset to one side (here, the front side) from the center of the mixing chamber 5. The second inlet pipe 2 is connected to the mixing chamber 5 at a position offset to the other side from the center C of the mixing chamber 5. Furthermore, the first inlet pipe 1 and the second inlet pipe 2 are connected to the mixing chamber 5 so as to run along the inner wall of the mixing chamber 5.

[0059] In the vascular anastomosis device 10d, blood from the first inlet tube 1 and blood from the second inlet tube 2 flow along the inner wall of the mixing chamber 5, creating a circulating flow inside the mixing chamber 5. This allows the blood in the superior vena cava and the inferior vena cava to be mixed appropriately.

[0060] The mixing chamber 5 of the vascular anastomosis device 10d may have an inward protrusion or a partially recessed recess on the inner wall.

[0061] [Embodiment 6] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0062] 16 is a front view showing the configuration of a vascular anastomosis device 10e of this embodiment. The vascular anastomosis device 10e includes a first inlet pipe 1, a second inlet pipe 2, a first outlet pipe 3, a second outlet pipe 4, and a mixing chamber 5. The first outlet pipe 3 has first branch outlet pipes 3a and 3b that branch into two at its tip. The second outlet pipe 4 has second branch outlet pipes 4a and 4b that branch into two at its tip.

[0063] Each pulmonary artery branches into multiple branches in the lungs. The vascular anastomosis device 10e can be anastomosed to each of the branched pulmonary arteries using the first branch outlet pipes 3a, 3b and the second branch outlet pipes 4a, 4b. Therefore, the vascular anastomosis device can be anastomosed to the pulmonary artery at a more appropriate location depending on the patient's condition.

[0064] (Variation) The number of branched outlet pipes at the tip of the first outlet pipe 3 or the second outlet pipe 4 may be any number equal to or greater than two. The number of branches may be different between the first outlet pipe 3 and the second outlet pipe 4. Also, the tip of only one of the first outlet pipe 3 and the second outlet pipe 4 may be branched.

[0065] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0066] 1 1st inlet pipe 2 2nd inlet pipe 3 1st outlet pipe 3a, 3b 1st branch outlet pipe 4 2nd outlet pipe 4a, 4b 2nd branch outlet pipe 5, 5c mixing chamber 6 Protrusion 7 Third inlet pipe 8 Confluence pipe 10, 10a-10e Vascular anastomosis device

Claims

1. a first inlet duct anastomosed to the superior vena cava; a second inlet duct anastomosed to the inferior vena cava; a mixing chamber connected to the first inlet pipe and the second inlet pipe, the mixing chamber having an inner width greater than the inner diameter of the first inlet pipe and the inner diameter of the second inlet pipe, and an inner wall that is concave inward in a cross section; a first outlet tube connected to the mixing chamber and anastomosed to the right pulmonary artery; a second outlet tube connected to the mixing chamber and anastomosed to the left pulmonary artery.

2. The vascular anastomosis device according to claim 1 , wherein in a cross section through the first inlet tube and the second inlet tube, the inner wall of the mixing chamber is inwardly concave.

3. a first inlet duct anastomosed to the superior vena cava; a second inlet duct anastomosed to the inferior vena cava; a rotating mixing chamber connected to the first inlet pipe and the second inlet pipe and having an inner diameter larger than the inner diameters of the first inlet pipe and the second inlet pipe; a first outlet tube connected to the mixing chamber and anastomosed to the right pulmonary artery; a second outlet tube connected to the mixing chamber and anastomosed to the left pulmonary artery.

4. The vascular anastomosis device according to claim 1 , wherein blood circulates inside the mixing chamber along an inner wall of the mixing chamber.

5. The vascular anastomosis device according to claim 1 , wherein the mixing chamber is spherical or cylindrical.

6. The vascular anastomosis device according to claim 1 , wherein the mixing chamber has an inwardly protruding protrusion on an inner wall thereof.

7. The vascular anastomosis device according to claim 1 , wherein the mixing chamber has a partially recessed recess on an inner wall thereof.

8. a confluence pipe into which the blood from the first inlet pipe and the blood from the second inlet pipe join and flow, The vascular anastomosis device according to claim 1 , wherein the first inlet pipe and the second inlet pipe are connected to the mixing chamber via the junction pipe.

9. The vascular anastomosis device according to claim 8 , wherein the confluence pipe is connected to the mixing chamber toward a position offset from the center of the mixing chamber.

10. The vascular anastomosis device according to claim 9 , wherein the confluence pipe is connected to the mixing chamber so as to extend along an inner wall of the mixing chamber.

11. The vascular anastomosis device according to claim 8 , wherein an angle formed between a direction in which blood flows from the first inlet pipe into the confluence pipe and a direction in which blood flows from the second inlet pipe into the confluence pipe is an acute angle.

12. the first inlet pipe is connected to the mixing chamber at a position offset to one side from the center of the mixing chamber, The vascular anastomosis device according to claim 1 , wherein the second inlet pipe is connected to the mixing chamber at a position offset from the center of the mixing chamber to the other side.

13. The vascular anastomosis device according to claim 1 , wherein the first outlet tube or the second outlet tube has a plurality of branch outlet tubes.

14. The vascular anastomosis device according to claim 1 , further comprising a third inlet tube connected to the mixing chamber, the third inlet tube being anastomosed to one of a plurality of superior vena cavae.

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