Series ventricular assist circulation device with low thermal injury

Abstract

The present invention relates to the technical field of cardiac blood pumps, and particularly to a series ventricular assist circulation device with low heat damage. The device includes: a motor body housing (1), an axial flow channel housing (3), a hub (2), a second impeller (21), and further includes a first impeller (11). The spiral outer edge line of the impeller surface of the first impeller (11) is fixedly connected along the inner wall surface of the axial flow channel housing (3), and the spiral inner edge line of the impeller surface of the first impeller (11) is fixedly connected along the outer peripheral surface of the motor body housing (1); there is a free rotation gap between the spiral outer edge line of the impeller surface of the second impeller (21) and the inner wall surface of the axial flow channel housing (3), and the spiral inner edge line of the impeller surface of the second impeller (21) is fixedly connected along the circumferential direction of the hub (2). A support system and a heat dissipation system are constructed as the same path structure, which increases the heat dissipation effect on the basis of reducing the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of cardiac blood pumps, and particularly to a series ventricular assist circulation device with low heat damage. Background Art

[0002] Cardiac blood pumps are important assistive circulation devices. Currently, there are two types of designs for cardiac blood pumps. The first type is a temporary assistive circulation device, which is used during surgery or for a short period. Its design concept is to construct a channel within the cardiac aorta. There is a blood channel between this channel and the cardiac aorta, and this channel is in a parallel configuration with the cardiac aorta. Blood can flow through both the original aorta and the newly constructed channel. The second type is a permanent assistive circulation device, generally suitable for heart failure patients. There are generally two types of designs for this permanent assistive circulation device. One type is an apical bypass assistive circulation device, such as patent application number 201410537298.X. The other type is to construct a channel within the cardiac aorta, which is the same size as the cardiac aorta, and this channel is in a series configuration with the cardiac aorta. For example, patents CN104168932B, 202311693255.6, etc. all belong to cardiac blood pumps with a series configuration.

[0003] The cardiac blood pump involved in the present invention is a permanent assistive circulation device for heart failure patients, and it adopts a series configuration. Currently, the structure of the cardiac blood pump with a series configuration is mainly: a motor body housing, an axial flow channel housing coaxially sleeved outside the motor body housing, a hub connected to the lower end of the motor body housing, and a second impeller circumferentially connected to the hub. It operates in an axial flow mode. Generally, the caliber size of the axial flow channel housing is adapted to the caliber of the cardiac aorta. The blood in the ventricle is pushed into the cardiac aorta by the drive of the second impeller. Among them, the second impeller is always in a rotating state. There are stator and rotor structures inside the motor body housing. Due to friction, current heat effects, etc., the motor body housing will heat up. In the case of heat accumulation, only relying on the flow of blood to wash the motor body housing to cool it down to avoid high heat of the motor body housing and thus prevent high heat from causing hemolysis or other heat problems. The general common practice is to increase the length of the motor body housing to increase the heat dissipation area of the motor body housing. For example, in patent 202311693255.6, a circular fixing ring and a connecting rod are added for stability, resulting in a complex structure. Increasing the length of the motor body housing, as well as the circular fixing ring and the connecting rod, will increase the weight of the entire device, thereby increasing the risk of the device falling off from the suture and dropping into the ventricle.

[0004] How to solve the problem of heat accumulation in the motor body housing is the technical problem to be solved by the present invention. Summary of the Invention

[0005] The object of the present invention is to provide a series - type ventricular assist circulation device with low heat damage, and the device is provided with a new heat dissipation path.

[0006] The present invention provides a series - type ventricular assist circulation device with low heat damage, including: a motor body housing, an axial flow channel housing coaxially sleeved outside the motor body housing, a hub connected to the lower end of the motor body housing, a second impeller circumferentially connected to the hub, and further including a first impeller. The spiral outer edge line of the impeller surface of the first impeller is fixedly connected along the inner wall surface of the axial flow channel housing, and the spiral inner edge line of the impeller surface of the first impeller is fixedly connected along the outer peripheral surface of the motor body housing; the spiral outer edge line of the impeller surface of the second impeller has a free rotation gap with the inner wall surface of the axial flow channel housing, and the spiral inner edge line of the impeller surface of the second impeller is fixedly connected circumferentially along the hub; the spiral direction of the first impeller is opposite to that of the second impeller.

[0007] The design principle of the present invention is as follows:

[0008] The existing series - type ventricular assist circulation device includes: a motor body housing, an axial flow channel housing coaxially sleeved outside the motor body housing, a hub connected to the lower end of the motor body housing, a second impeller circumferentially connected to the hub, a first impeller that is not in contact with the motor body housing and is only disposed on one side of the inner wall of the axial flow channel housing and only serves to eliminate the rotational movement of blood caused by the second impeller, a support rod that suspends the motor body housing on the central axis of the axial flow channel housing, the motor body housing extending through the aortic valve, a connecting rod and a fixing ring for fixing the upper end of the motor body housing provided at the upper end of the motor body housing. The heat dissipation path of this device only depends on the motor body housing, and the upward dimension of the motor body housing is increased to improve the heat dissipation effect. The overall weight of this device is relatively large. The support path I of this device includes the motor body housing, the support rod, and the axial flow channel housing connected in sequence, and the support path II of this device includes the motor body housing, the connecting rod, and the fixing ring connected in sequence.

[0009] In the present invention, the first fan blade is bridged between the motor body housing and the axial flow channel housing, so as to introduce the heat of the motor body housing into the first fan blade and the axial flow channel housing, such that the first fan blade and the axial flow channel housing can also serve as heat dissipation surfaces, increasing the heat dissipation area in contact with blood. At the same time, the length of the motor housing body does not need to be increased, and even the diameter of the motor housing body can be further reduced, increasing the blood flow area. The present invention constructs a new heat dissipation path: the motor body housing, the first fan blade, and the axial flow channel housing. The first fan blade is a fixed structure and does not rotate. One side is fixed to the motor body housing and the other side is fixed to the axial flow channel housing, greatly increasing the heat dissipation area. At the same time, the first fan blade also plays a role in supporting the motor body housing, eliminating the support rods, connecting rods, and fixing rings in the prior art. A new support path is constructed: the motor body housing, the first fan blade, and the axial flow channel housing. The support path coincides with the heat dissipation path, playing a dual function. The spiral direction of the first fan blade is opposite to that of the second fan blade, serving to eliminate the rotational movement of blood caused by the second fan blade. Therefore, the first fan blade in the present invention plays three roles: support, heat dissipation and heat conduction, and anti-blood rotation. The traditional first fan blade is only a guide vane connected to the inner wall of the axial flow channel housing on one side, which only plays the role of anti-blood rotation. In contrast, the present invention can prevent the accumulation of the motor body housing without relying on the method of increasing the area by extending the length or diameter of the motor body housing, but proposes a new technical method of using the axial flow channel housing for heat dissipation. The device can be provided with a shorter motor body housing and a smaller-diameter motor body housing.

[0010] Preferably, a radially outward flanging portion is provided at the upper end of the axial flow channel housing, and a suture body is pre-mounted or temporarily assembled on the upper surface and / or the lower surface of the flanging portion. The suture body located on the upper surface is an upper suture body for suturing with the lower surface of the heart valve root, and the suture body located on the lower surface is a lower suture body for suturing with the inner surface of the cardiac artery tube.

[0011] Preferably, a plurality of assembly holes are provided in the flanging portion, and the axial direction of the assembly holes is the same as the axial direction of the axial flow channel housing. The upper suture body and / or the lower suture body are pre-mounted or temporarily assembled on the upper and / or lower sides of the flanging portion after the suture thread passes through the assembly holes.

[0012] In the existing installation technology of the axial flow channel shell, such as CN1253837A, the general method is to sleeve a suture body on the circumferential surface of the axial flow channel shell, and then suture and connect it to the inner wall of the aorta through the suture body. However, generally, the suture body is not firmly sleeved on the circumferential surface of the axial flow channel shell, and there is a risk of slippage. The general method is to set a wire passing hole in the horizontal direction of the shaft hole, and suture the suture body on the circumferential surface through the wire passing hole in the horizontal direction of the shaft hole. However, when setting the wire passing hole in the horizontal direction of the shaft hole, the suture line will pass through the wire passing hole and be exposed on the inner side wall of the axial flow channel shell. Therefore, the suture line will be exposed in the blood flow channel. Experimental studies have found that this will cause blood to form thrombus based on the suture line and accumulate in the flow channel. Therefore, CN1253837A does not adopt the wire passing hole in the horizontal direction of the shaft hole, but adopts the mortise and tenon concept. The circumferential surface of the axial flow channel shell is recessed radially inward, so that the suture body is clamped into the inner recess to form a snap connection. However, since the suture body is a braided structure and has high flexibility and easy deformation characteristics. Therefore, there is still a risk of slippage in this way. In order not to adopt the mortise and tenon technology concept that is prone to slippage, but to adopt the suture connection technology concept, and at the same time avoid the problem that the suture line will be exposed in the blood flow channel, the present invention adopts the flanging technology concept, that is, a radial (horizontal) flange is formed at the upper end of the axial flow channel shell to form a horizontally extended flange portion, and then the suture body is lapped on the upper surface and / or lower surface of the flange portion. Further, an assembly hole with the same axial direction as the axial direction of the axial flow channel shell is provided on the flange portion, and the suture line is wound up and down through the assembly hole to fix the suture body on the upper surface and / or lower surface of the flange portion, and the suture line will not appear in the flow channel of the axial flow channel shell. The assembly steps of the present invention are generally as follows: 1. In vitro, cut a suture body with the same width and inner diameter as the flange portion, place the suture body on the upper surface and / or lower surface of the flange portion, and use the suture line to wind up and down through the assembly hole to fix the suture body on the upper surface and / or lower surface of the flange portion. The formed structure is called an assembly. 2. In vivo, suture the suture body to the cardiac artery tube with a suture line.

[0013] In the present invention, since the suture body fixed on the upper surface and / or lower surface of the flange portion is adopted, wherein the upper suture body is sutured to the lower surface of the cardiac valve root, which can facilitate increasing the suture area. Form a downward force to avoid suturing with the cardiac artery tube and form an oblique force. Among them, the lower suture body is sutured to the cardiac artery tube to form a supporting force, which is equivalent to constructing a clamping groove in the cardiac artery tube, and then inserting the flange portion into the clamping groove to increase the installation stability of the device.

[0014] Preferably, the outer diameter dimension of the flange portion is preset to the inner diameter dimension of the cardiac artery tube.

[0015] Preferably, the suture body is an annular medical polyester braid or an annular polytetrafluoroethylene braid or an annular artificial blood vessel.

[0016] Preferably, the upper end of the motor body housing extends from the upper end of the axial flow channel housing and is located below or above the aortic valve.

[0017] Preferably, the upper surface or / and the lower surface of the flanging portion has a concave structure in the axial direction, and the upper suture body or / and the lower suture body is embedded in the concave structure.

[0018] Preferably, the axial flow channel housing, the second fan blade, and the motor body housing are all made of high thermal conductivity material.

[0019] The sum of the lengths of the spiral inner edges of all the first fan blades is greater than or equal to the outer circumference of the motor body housing, and the sum of the lengths of the spiral outer edges of all the first fan blades is greater than or equal to the inner circumference of the axial flow channel housing.

[0020] The thickness of the first fan blade on the side close to the motor body housing is greater than the thickness on the side close to the axial flow channel housing.

[0021] Among them, the high thermal conductivity material bodies are all metal materials. The axial flow channel housing serves as a base, the second fan blade serves as a connecting body, and the motor body housing serves as an object to be supported. It constructs a new support system and heat dissipation system. Among them, in order to increase the support stability and heat dissipation effect, the lengths of the spiral inner edge and the spiral outer edge of the first fan blade are subject to the above constraints, which can further increase the above effects. Since the first fan blade is a spiral ascending structure, both of its sides are connected by lines rather than points. At the same time, the thickness of the first fan blade on the side close to the motor body housing can be further increased to be greater than the thickness on the side close to the axial flow channel housing to increase its thermal conductivity.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. It constructs a support system and a heat dissipation system with the same path structure, increasing the heat dissipation effect while reducing the structure.

[0024] 2. It constructs a suture body in a groove shape in the cardiac artery tube, which is inserted into the flanging portion, and still has a stable assembly effect in the case of suture failure.

[0025] 3. It uses sutures to fixedly connect the device to the suture body, increasing the stability of the device and having no risk of slipping. Among them, the sutures are up-and-down sutures and do not need to be exposed in the flow channel to avoid thrombus formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic cross-sectional view of the present invention.

[0027] Figure 2 is Figure 1 an enlarged schematic view of the enlarged area FD in

[0028] Figure 3 a front top view of the present invention.

[0029] Figure 4 This is the perspective view from the bottom-up angle of the present invention.

[0030] Figure 5 This is the perspective view from the top-down angle of the present invention.

[0031] Figure 6 This is the second embodiment of the present invention.

[0032] The reference numerals in the figure are respectively: 1. motor body housing, 2. wheel hub, 3. axial flow channel housing, 5. heart artery tube, 6. heart valve, 7. suture, 11. first fan blade, 21. second fan blade, 31. flanging part, 32. assembly hole, 41. lower suture body, 42. upper suture body, 61. heart valve root. Detailed implementation manners

[0033] The following further elaborates on the present invention in combination with embodiments and the accompanying drawings, but the implementation manners of the present invention are not limited thereto.

[0034] Embodiment 1

[0035] As Figures 1-6 shown, the present invention provides a series-connected ventricular assist circulation device with low heat damage, including: a motor body housing 1, an axial flow channel housing 3 coaxially sleeved outside the motor body housing, a wheel hub 2 connected to the lower end of the motor body housing 1, and a second fan blade 21 circumferentially connected to the wheel hub 2. It further includes a first fan blade 11. The spiral outer edge line of the fan surface of the first fan blade 11 is fixedly connected along the inner wall surface of the axial flow channel housing 3, and the spiral inner edge line of the fan surface of the first fan blade 11 is fixedly connected along the outer peripheral surface of the motor body housing 1; the spiral outer edge line of the fan surface of the second fan blade 21 has a free rotation gap with the inner wall surface of the axial flow channel housing 3, and the spiral inner edge line of the fan surface of the second fan blade 21 is fixedly connected circumferentially along the wheel hub 2; the spiral direction of the first fan blade 11 is opposite to that of the second fan blade 21.

[0036] As Figure 1 shown, the motor body housing 1 extends and passes through the heart valve 6. The wheel hub 2 and the second fan blade 21 form an impeller. The motor body housing 1 and the impeller are designed as separate bodies with the heart valve 6 as the boundary. The main part of the motor is located in the upper region of the heart valve 6, and the wheel hub 2 and the second fan blade 21 are located in the lower region of the heart valve 6. The axial flow channel housing 3 is sleeved outside the motor body housing 1. The region between the axial flow channel housing 3 and the motor body housing 1 forms a blood flow channel. The motor body housing 1 extends, and its diameter can be reduced to make the blood flow channel as large as possible. The second fan blade rotates in the blood flow channel to drive the blood upward to form pressure. When the heart valve 6 opens, the blood is sprayed from the inside of the ventricle into the heart artery tube.

[0037] As Figure 3As shown in the figure, there is a free rotation gap between the spiral outer edge line of the fan surface of the second fan blade 21 and the inner wall surface of the axial flow channel housing 3, while the spiral outer edge line of the fan surface of the first fan blade 11 is fixedly connected along the inner wall surface of the axial flow channel housing 3, and the spiral inner edge line of the fan surface of the first fan blade 11 is fixedly connected along the outer peripheral surface of the motor body housing 1. In the design, while considering preventing the blood rotation caused by the second fan blade 21, in order to increase the supporting effect on the motor body housing 1 and the heat conduction and heat dissipation effects, the spiral inner edge line should increase the line contact length with the motor body housing 1 as much as possible. In Figure 3 it, the seemingly horizontal spiral inner edge line is actually a spiral downward line, and its length is much greater than the projected length in the top view direction.

[0038] Among them, the number of the second fan blades 21 is 2, 3 or multiple. Generally, the number of the first fan blades 11 can be the same as or different from that of the second fan blades 21.

[0039] Such as 1, Figure 2 and Figure 3 , the outer diameter size of the axial flow channel housing 3 is slightly equal to that of the cardiac artery tube 5. The upper port of the axial flow channel housing 3 adopts a flanging process to form a flanging part 31. The flanging part should not be too wide, and the size of the assembly hole 32 with the up and down axis can be formed on the flanging part. The flanging part can be a horizontal straight type or an edge curved type flanging. At least one upper and lower plane of it is provided with a suture body as a medium to be sutured and connected with the cardiac valve root 61 or / and the cardiac artery tube 5 by a suture line 7. The assembly hole 32 is also used for the suture line 7 to pass through. In the present invention, the axial flow channel housing 3 is hoisted by means of the cardiac valve root 61. The cardiac valve root 61 is the root part of the cardiac valve 6, and this part generally grows horizontally perpendicular to the cardiac artery tube 5 and is relatively thick. The cardiac valve root 61 has stronger toughness and can carry heavier devices, which is more beneficial to the convenience of suture operation, the safety of subsequent use, and the suture area. Compared with the traditional method of directly suturing on the inner wall of the cardiac artery tube, the damage to the cardiac artery tube is smaller. Such as Figure 2 shown, the suture lines in the present invention all adopt vertically arranged suture lines and will not appear on the inner wall of the axial flow channel housing 3, avoiding the risk of thrombus.

[0040] Such as Figure 2 shown, the suture body includes a lower suture body 41 and an upper suture body 42. Among them, the lower suture body 41, the flanging part, and the upper suture body 42 are stacked up and down to form a stacked combination body. Among them, the cardiac valve root 61 is also a horizontal human tissue structure. The cardiac valve root 61, the lower suture body 41, the flanging part, and the upper suture body 42 are stacked up and down to form a stacked combination body. It forms a hanging mode, and the flanging part is equivalent to being embedded in the stacked combination body.

[0041] Such as Figure 4 shown, Figure 4The heart valve 6, the heart valve root 61, and the upper suture body 42 are not shown. The axial flow channel housing 3 is sleeved on the inner wall of the cardiac artery tube 5. The axial direction of the assembly hole 32, the axial direction of the axial flow channel housing 3, the axial direction of the cardiac artery tube 5, and the axial direction of the motor body housing are all the up-and-down direction.

[0042] The design principle of the present invention is as follows:

[0043] The existing series ventricular assist circulation device includes: a motor body housing, an axial flow channel housing 3 coaxially sleeved outside the motor body housing, a hub connected to the lower end of the motor body housing, a second impeller circumferentially connected to the hub, a first impeller that is not in contact connection with the motor body housing and is only disposed on one side of the inner wall of the axial flow channel housing 3 and only serves to eliminate the rotational movement of the blood caused by the second impeller, and a support rod that suspends the motor body housing 1 on the axis of the axial flow channel. The motor body housing 1 extends through the aortic valve, and a connecting rod and a fixing ring for fixing the upper end of the motor body housing 1 are provided at the upper end of the motor body housing 1. The heat dissipation path of this device only depends on the motor body housing 1, and the size of the motor body housing 1 is increased upward, thereby improving the heat dissipation effect. The overall weight of this device is relatively large. The support path I of this device includes the motor body housing, the support rod, and the axial flow channel housing connected in sequence, and the support path II of this device includes the motor body housing, the connecting rod, and the fixing ring connected in sequence.

[0044] In the present invention, the first impeller is bridged between the motor body housing and the axial flow channel housing, so that the heat of the motor body housing is introduced into the first impeller and the axial flow channel housing, enabling the first impeller and the axial flow channel housing to also serve as heat dissipation surfaces, increasing the heat dissipation area in contact with the blood. At the same time, the length of the motor housing body does not need to be increased, and even the diameter of the motor housing body can be further reduced, increasing the blood flow area. The present invention constructs a new heat dissipation path: the motor body housing, the first impeller, and the axial flow channel housing. The first impeller is a fixed structure and does not rotate. One side is fixed to the motor body housing and the other side is fixed to the axial flow channel housing. This greatly increases the heat dissipation area. At the same time, the first impeller also plays a role in supporting the motor body housing, eliminating the support rod, connecting rod, and fixing ring in the prior art. A new support path is constructed: the motor body housing, the first impeller, and the axial flow channel housing. The support path coincides with the heat dissipation path, playing a dual function. The spiral direction of the first impeller is opposite to that of the second impeller, serving to eliminate the rotational movement of the blood caused by the second impeller. Therefore, the first impeller in the present invention plays three roles: support, heat dissipation and heat conduction, and anti-blood rotation. The traditional first impeller is only a guide vane connected to the inner wall of the axial flow channel housing on one side, and it only serves to prevent blood rotation. In contrast, the present invention can prevent the accumulation of the motor body housing without relying on the method of increasing the area by extending the length or diameter of the motor body housing, but proposes a new technical method of using the axial flow channel housing for heat dissipation. This device can be provided with a shorter motor body housing and a smaller diameter motor body housing.

[0045] Preferably, a radially outward flanging portion 31 is provided at the upper end of the axial flow channel housing 3, and a suture body is pre-mounted or temporarily assembled on the upper surface and / or the lower surface of the flanging portion 31. The suture body located on the upper surface is an upper suture body 42 for suturing with the lower surface of the heart valve root, and the suture body located on the upper surface is a lower suture body 41 for suturing with the inner surface of the cardiac artery tube.

[0046] Preferably, the flanging portion 31 is provided with a plurality of assembly holes 32, and the axial direction of the assembly holes 32 is the same as the axial direction of the axial flow channel housing. The upper suture body 42 and / or the lower suture body 41 are pre-mounted or temporarily assembled on the upper and / or lower sides of the flanging portion 31 after the suture thread 7 passes through the assembly holes 32.

[0047] In the existing installation technology of the axial flow channel housing 3, for example, in CN1253837A, the general method is to sleeved a suture body on the circumferential surface of the axial flow channel housing 3, and then suture and connect it with the inner wall of the aorta through the suture body. However, generally, the suture body sleeved on the circumferential surface of the axial flow channel housing 3 is not firm and there is a risk of slipping. Generally, a wire passing hole with a horizontal axial hole is provided, and the suture body is sutured on the circumferential surface through the wire passing hole with a horizontal axial hole. However, when setting the wire passing hole with a horizontal axial hole, the suture thread will pass through the wire passing hole and be exposed on the inner side wall of the axial flow channel housing 3. Therefore, the suture thread will be exposed in the blood flow channel. Experimental studies have found that this will cause blood to form thrombus based on the suture thread and accumulate in the flow channel. Therefore, CN1253837A does not adopt the wire passing hole with a horizontal axial hole, but adopts the mortise and tenon concept, and the circumferential surface of the axial flow channel housing 3 is recessed radially inward, so that the suture body is snapped into the inner recess to form a snap connection. However, since the suture body is a braided structure and itself has high flexibility and easy deformation characteristics. Therefore, this method still has a risk of slipping. In order not to adopt the mortise and tenon technology concept that is prone to slipping, but to adopt the suture connection technology concept, and at the same time avoid the problem that the suture thread will be exposed in the blood flow channel, the present invention adopts the flanging technology concept, that is, radially (horizontally) flanging at the upper end of the axial flow channel housing 3 to form a horizontally extended flanging portion 31, and then lapping the suture body on the upper surface and / or the lower surface of the flanging portion 31. Further, assembly holes 32 with an axial direction the same as the axial direction of the axial flow channel housing are provided on the flanging portion 31, and the suture thread is wound up and down through the assembly holes 32 to fix the suture body on the upper surface and / or the lower surface of the flanging portion 31, and the suture thread will not appear in the flow channel of the axial flow channel housing 3. The assembly steps of the present invention are generally as follows: 1. In vitro, cut a suture body with the same width and inner diameter as the flanging portion, place the suture body on the upper surface and / or the lower surface of the flanging portion 31, and use the suture thread to wind up and down through the assembly holes 32 to fix the suture body on the upper surface and / or the lower surface of the flanging portion 31. The formed structure is called an assembly. 2. In vivo, suture the suture body with the cardiac artery tube using the suture thread.

[0048] In the present invention, since a suture body is fixed on the upper surface or / and the lower surface of the flanging part 31, wherein the upper suture body 42 is sutured to the lower surface of the heart valve root, which can facilitate increasing the suture area. A downward force is formed to avoid suturing with the cardiac artery tube and forming an oblique force. Among them, the lower suture body 41 is sutured to the cardiac artery tube to form a supporting force, which is equivalent to constructing a clamping groove in the cardiac artery tube, and then inserting the flanging part into the clamping groove to increase the installation stability of the device.

[0049] Preferably, the outer diameter dimension of the outer edge of the flanging part 31 is preset as the inner diameter dimension of the cardiac artery tube.

[0050] Preferably, the suture body is an annular medical polyester braid or an annular polytetrafluoroethylene braid or an annular artificial blood vessel.

[0051] Preferably, the upper end of the motor body housing 1 extends out from the upper end of the axial flow channel housing 3 and is located below or above the aortic valve.

[0052] Preferably, the upper surface or / and the lower surface of the flanging part 31 has an inward concave structure in the axial direction, and the upper suture body 42 or / and the lower suture body 41 is embedded in the inward concave structure.

[0053] Preferably, the axial flow channel housing 3, the second fan blade 21, and the motor body housing 1 are all made of high thermal conductivity material bodies.

[0054] The sum of the lengths of the spiral inner edges of all the first fan blades 11 is greater than or equal to the outer circumference of the motor body housing 1, and the sum of the lengths of the spiral outer edges of all the first fan blades 11 is greater than or equal to the inner circumference of the axial flow channel housing 3. The thickness of the first fan blade 11 on the side close to the motor body housing 1 is greater than the thickness on the side close to the axial flow channel housing 3.

[0055] Among them, the high thermal conductivity material bodies are all metal materials. The axial flow channel housing 3 serves as a base, the second fan blade 21 serves as a connecting body, and the motor body housing 1 serves as an object to be supported. A new support system and heat dissipation system are constructed. Among them, in order to increase the support stability and heat dissipation effect, the lengths of the spiral inner edge and the spiral outer edge of the first fan blade 11 are subject to the above constraints, which can further increase the above effects. Since the first fan blade 11 is a spiral rising structure, both sides of it are connected by lines rather than points. At the same time, the thickness of the first fan blade 11 on the side close to the motor body housing 1 can be further increased to be greater than the thickness on the side close to the axial flow channel housing 3 to increase its thermal conductivity.

[0056] Example 2:

[0057] As Figure 6As shown, the motor body housing 1 does not extend and does not pass through the heart valve 6. The hub 2 and the second blade 21 form an impeller. The main body of the motor is located in the lower region of the heart valve 6, and the hub 2 and the second blade 21 are also located in the lower region of the heart valve 6. The axial flow channel housing 3 is sleeved outside the motor body housing 1. The rest of the structure is the same as that of Embodiment 1.

[0058] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention / invention. However, the present invention / invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention / invention, and these modifications and improvements are also regarded as the protection scope of the present invention / invention.

Claims

1. A low-heat-damage tandem ventricular assist circulation device, comprising: A motor housing (1), an axial flow channel shell (3) coaxially sleeved outside the motor housing, a hub (2) connected to the lower end of the motor housing (1), and a second fan blade (21) circumferentially connected to the hub (2), characterized in that it also includes a first fan blade (11), the spiral outer edge line of the fan blade surface of the first fan blade (11) is fixedly connected along the inner wall surface of the axial flow channel shell (3), and the spiral inner edge line of the fan blade surface of the first fan blade (11) is fixedly connected along the outer circumferential surface of the motor housing (1); there is a free rotation gap between the spiral outer edge line of the fan blade surface of the second fan blade (21) and the inner wall surface of the axial flow channel shell (3), and the spiral inner edge line of the fan blade surface of the second fan blade (21) is fixedly connected along the circumferential direction of the hub (2); the spiral direction of the first fan blade (11) The spiral direction is opposite to that of the second blade (21); the upper end of the axial flow channel shell (3) is provided with a radially outward flange portion (31); the upper surface and the lower surface of the flange portion (31) are pre-installed or temporarily assembled with suture bodies; the suture body located on the upper surface is an upper suture body (42) used for suturing with the lower surface of the heart valve root, and the suture body located on the upper surface is a lower suture body (41) used for suturing with the inner surface of the heart artery tube; the flange portion (31) is provided with a plurality of assembly holes (32); the axial direction of the assembly holes (32) is the same as the axial direction of the axial flow channel shell; the upper suture body (42) and the lower suture body (41) are pre-installed or temporarily assembled on the upper and lower sides of the flange portion (31) after the suture thread (7) passes through the assembly hole (32).

2. The low thermal damage tandem ventricular assist circulation device according to claim 1, characterized in that: The outer diameter size of the flange portion (31) is preset to be the inner diameter size of the cardiac artery tube.

3. The low thermal damage tandem ventricular assist circulation device according to claim 1, characterized in that: The suture body is a circular medical polyester braided body or a circular polytetrafluoroethylene braided body or a circular artificial blood vessel.

4. The low thermal damage tandem ventricular assist circulation device according to claim 1, characterized in that: The upper end of the motor body shell (1) extends out from the upper end of the axial flow channel shell (3).

5. The low thermal injury tandem ventricular assist circulation device according to claim 1, characterized in that: The upper surface and / or the lower surface of the flange portion (31) has an axially concave structure, and the upper suture body (42) and / or the lower suture body (41) are embedded in the concave structure.

6. The low thermal injury tandem ventricular assist circulation device according to any one of claims 1 to 5, characterized in that: The axial flow channel shell (3), the second fan blade (21), and the motor body shell (1) are all made of high thermal conductivity materials.

7. The low thermal injury tandem ventricular assist circulation device according to any one of claims 1 to 5, characterized in that: The sum of the lengths of the spiral inner edges of all the first blades (11) is greater than or equal to the outer circumference of the motor housing (1), and the sum of the lengths of the spiral outer edges of all the first blades (11) is greater than or equal to the inner circumference of the axial flow channel housing (3).

8. The low thermal injury tandem ventricular assist circulation device according to any one of claims 1 to 5, characterized in that: The thickness of the first fan blade (11) on a side close to the motor body shell (1) is greater than the thickness of the side close to the axial flow channel shell (3).

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