Tandem type ventricular auxiliary circulation device with low thermal damage

Abstract

The invention relates to the technical field of heart blood pumps, in particular to a tandem type ventricular auxiliary circulation device with low thermal damage. The device comprises a motor body shell (1), an axial flow channel shell (3), a hub (2) and second fan blades (21), and further comprises first fan blades (11), the spiral outer edge lines of the fan blade surfaces of the first fan blades (11) are fixedly connected along the inner wall surface of the axial flow channel shell (3), and the spiral inner edge lines of the fan blade surfaces of the first fan blades (11) are fixedly connected along the outer circumferential surface of the motor body shell (1); a free rotating gap exists 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 in the circumferential direction of the hub (2). A supporting system and a heat dissipation system are constructed to be of the same path structure, and the heat dissipation effect is improved on the basis that the structure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cardiac blood pumps, and in particular to a series-connected ventricular assist circulation device with low thermal damage. Background Art

[0002] The heart blood pump is an important auxiliary circulation device. There are currently two types of designs for heart blood pumps. The first type is a temporary auxiliary circulation device, which is used during surgery or for a short period of time. The design concept is: to construct a channel in the heart's aorta. There is a blood channel between this channel and the heart's aorta. The channel is configured in parallel with the heart's aorta, and blood can flow through the original aorta and through the newly constructed channel; the second type is a permanent auxiliary circulation device, which is generally suitable for patients with heart failure. This type of permanent auxiliary circulation device generally has two types of designs. One is an apical bypass auxiliary circulation device, such as patent application number 201410537298.X, and the other is to construct a channel in the heart's aorta. This channel is the same size as the heart's aorta and is configured in series with the heart's aorta. For example, patents CN104168932B and 202311693255.6 all belong to heart blood pumps with a series configuration.

[0003] The heart blood pump involved in the present invention is a permanent auxiliary circulation device suitable for patients with heart failure, which adopts a series configuration. The structure of the heart blood pump with a series configuration is mainly: a motor housing, an axial flow channel shell coaxially mounted outside the motor housing, a hub connected to the lower end of the motor housing, and a second fan blade circumferentially connected to the hub. It works in an axial flow mode. Generally, the caliber of the axial flow channel shell is adapted to the caliber of the heart's aorta. The blood in the ventricle is driven by the second fan blade, which pushes the blood into the heart's aorta. The second fan blade is always in a rotating state. There are stators and rotor structures inside the motor housing. These structures will cause the motor housing to heat up due to friction, current thermal effects, etc. In the case of heat accumulation, the motor housing is cooled only by the flow of blood to avoid high heat in the motor housing and prevent hemolysis or other thermal problems caused by high heat. The general practice is to increase the length of the motor housing to increase the heat dissipation area of ​​the motor housing. For example, patent 202311693255.6 also adds an annular fixing ring and a connecting rod for stability, which leads to a complex structure. Increasing the length of the motor housing and the annular fixing ring and the connecting rod will increase the weight of the entire device, resulting in the risk of the device falling off from the suture and falling into the ventricle.

[0004] How to solve the problem of heat accumulation on the motor 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 ventricular assist circulation device with low thermal damage, wherein a new heat dissipation path is arranged in the device.

[0006] The present invention provides a low-heat-damage series ventricular assist circulation device, comprising: a motor body shell, an axial flow channel shell coaxially sleeved on the outside of the motor body shell, a hub connected to the lower end of the motor body shell, a second fan blade circumferentially connected to the hub, and also comprising a first fan blade, wherein the spiral outer edge line of the blade surface of the first fan blade is fixedly connected along the inner wall surface of the axial flow channel shell, and the spiral inner edge line of the blade surface of the first fan blade is fixedly connected along the outer circumferential surface of the motor body shell; there is a free rotation gap between the spiral outer edge line of the blade surface of the second fan blade and the inner wall surface of the axial flow channel shell, and the spiral inner edge line of the blade surface of the second fan blade is fixedly connected along the circumference of the hub; the spiral direction of the first fan blade is opposite to the spiral direction of the second fan blade.

[0007] The design principle of the present invention is as follows: The existing serial ventricular assist circulation device includes: a motor body shell, an axial flow channel shell coaxially sleeved outside the motor body shell, a hub connected to the lower end of the motor body shell, a second fan blade circumferentially connected to the hub, a first fan blade that is not in contact with the motor body shell, and is only arranged on one side of the inner wall of the axial flow channel shell, and only serves to eliminate the blood rotation caused by the second fan blade, and a support rod that suspends the motor body shell on the central axis of the axial flow channel shell, and the motor body shell extends through the aortic valve, and the upper end of the motor body shell is provided with a connecting rod and a fixing ring for fixing the upper end of the motor body shell. The heat dissipation path of the device only relies on the motor body shell, and increases the upward size of the motor body shell, thereby improving the heat dissipation effect. The overall weight of the device is relatively large. The device support path I includes the motor body shell, the support rod, and the axial flow channel shell connected in sequence, and the device support path II includes the motor body shell, the connecting rod, and the fixing ring connected in sequence.

[0008] The present invention bridges the first fan blade between the motor housing and the axial flow channel shell, thereby introducing the heat of the motor housing into the first fan blade and the axial flow channel shell, so that the first fan blade and the axial flow channel shell can also be used as heat dissipation surfaces to increase the heat dissipation area of ​​blood contact, and at the same time, the length of the motor housing does not need to be increased, and the motor housing can even be further reduced in diameter to increase the blood flow area. The present invention constructs a new heat dissipation path: the motor housing, the first fan blade, and the axial flow channel shell. The first fan blade is a fixed structure, which does not rotate, one side is fixed to the motor housing, and the other side is fixed to the axial flow channel shell. Greatly increased heat dissipation area. At the same time, the first fan blade also plays a role in supporting the motor housing, eliminating the support rod, connecting rod, and fixed ring in the prior art. A new support path is constructed: the motor housing, the first fan blade, and the axial flow channel shell. The support path overlaps with the heat dissipation path and plays a dual function. The spiral direction of the first fan blade is opposite to the spiral direction of the second fan blade, which plays a role in eliminating 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 blood rotation resistance. The traditional first fan blade is only a guide vane connected to the inner wall of the axial flow channel shell on one side, which only plays the role of blood rotation resistance. In comparison, the present invention does not rely on extending the length or diameter of the motor shell to increase the area to prevent the motor shell from accumulating, but proposes a new technical method of heat dissipation by means of the axial flow channel shell, and the device can be provided with a shorter motor shell and a motor shell with a smaller diameter.

[0009] Preferably, the upper end of the axial flow channel shell is provided with a radially outward flange portion, and the upper surface and / or lower surface of the flange portion are pre-installed or temporarily assembled with a suture body, the suture body located on the upper surface is an upper suture body 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 used for suturing with the inner surface of the heart artery tube.

[0010] Preferably, the flange portion is provided with a plurality of assembly holes, the axial direction of the assembly holes is the same as the axial direction of the axial flow channel shell, and the upper suture body and / or the lower suture body are pre-installed or temporarily assembled on the upper and / or lower sides of the flange portion after the suture thread passes through the assembly hole.

[0011] In the existing installation technology of the axial flow channel shell, such as CN1253837A, the general practice is to set a suture body on the circumferential surface of the axial flow channel shell, and then suture and connect it with the inner wall of the aorta through the suture body. However, the general suture body is not firmly set on the circumferential surface of the axial flow channel shell, and there is a risk of slipping. The general practice is to set a thread hole horizontal to the axial hole, and sew the suture body on the circumferential surface through the thread hole horizontal to the axial hole. However, if the thread hole horizontal to the axial hole is set, the suture will pass through the thread hole and be exposed on the inner wall of the axial flow channel shell. Therefore, the suture will be exposed in the blood flow channel. Experimental studies have found that this will cause blood to form a plug based on the suture and accumulate in the flow channel. Therefore, CN1253837A does not use the thread hole horizontal to the axial hole, but adopts the mortise and tenon conception, and the circumferential surface of the axial flow channel shell is recessed in the radial direction, so that the suture body is stuck in the inner recess to form a clamping connection, but because the suture body is a braided structure, it has high flexibility and easy deformation characteristics. Therefore, this method still has the risk of slipping. In order to avoid the technical concept of mortise and tenon, which is easy to slip, and to adopt the technical concept of suture connection, and to avoid the problem that the suture will be exposed in the blood flow channel, the present invention adopts the technical concept of flanging, that is, radial (horizontal) flanging is performed on the upper end of the axial flow channel shell to form a horizontally extended flanging part, and then the suture body is overlapped on the upper surface or / and the lower surface of the flanging part, wherein an assembly hole with the same axial direction as the axial direction of the axial flow channel shell is further provided on the flanging part, and the suture is passed through the assembly hole in a way of winding up and down to fix the suture body on the upper surface or / and the lower surface of the flanging part, and the suture 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 flanging part, place the suture body on the upper surface or / and the lower surface of the flanging part, use the suture to pass through the assembly hole in a way of winding up and down, and fix the suture body on the upper surface or / and the lower surface of the flanging part, and the structure formed is called an assembly body. 2. In vivo, suture the suture body to the cardiac artery tube using suture thread.

[0012] In the present invention, due to the use of a suture body fixed on the upper surface or / and the lower surface of the flange part, wherein the upper suture body is sutured with the lower surface of the heart valve root, it is convenient to increase the suture area. A positive downward force is formed, avoiding suture with the heart artery tube to form an oblique force. Among them, the lower suture body is sutured with the heart artery tube to form a supporting force, which is equivalent to constructing a slot in the heart artery tube, and then the flange part is inserted into the slot, thereby increasing the installation stability of the device.

[0013] Preferably, the outer diameter size of the flange portion is preset to be the inner diameter size of the cardiac artery tube.

[0014] Preferably, the suture is an annular medical polyester braid or an annular polytetrafluoroethylene braid or an annular artificial blood vessel.

[0015] Preferably, the upper end of the motor body shell extends from the upper end of the axial flow channel shell and is located below or above the aortic valve.

[0016] Preferably, the upper surface and / or the lower surface of the flange portion has an axially concave structure, and the upper suture body and / or the lower suture body are embedded in the concave structure.

[0017] Preferably, the axial flow channel shell, the second fan blades, and the motor body shell are all made of high thermal conductivity materials.

[0018] The sum of the lengths of the spiral inner edges of all the first blades is greater than or equal to the outer circumference of the motor housing, and the sum of the lengths of the spiral outer edges of all the first blades is greater than or equal to the inner circumference of the axial flow channel housing.

[0019] The thickness of the first blade on the side close to the motor housing is greater than the thickness on the side close to the axial flow channel shell.

[0020] Among them, the high thermal conductivity material body is all metal material, the axial flow channel shell serves as the base, the second fan blade serves as the connector, and the motor body shell serves as the supported object. 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 line and the spiral outer edge line 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 sides of it are line connections rather than point connections. At the same time, the thickness of the first fan blade close to the motor body shell can be further increased by making it thicker than the thickness close to the axial flow channel shell to increase its thermal conductivity.

[0021] The beneficial effects of the present invention are: 1. The support system and the heat dissipation system are constructed as the same set of path structures, which increases the heat dissipation effect while reducing the structure.

[0022] 2. A groove-shaped suture body is constructed in the cardiac artery tube, which is inserted into the flange part. Even if the suture line fails, a stable assembly effect can still be achieved.

[0023] 3. The device is fixedly connected to the suture body with sutures, which increases the stability of the device and eliminates the risk of slippage. The sutures are up-and-down sutures and do not need to be exposed in the flow channel, thus avoiding the formation of thrombus. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional schematic diagram of the present invention.

[0025] Figure 2 for Figure 1 Schematic diagram of the enlarged area FD in the middle.

[0026] Figure 3 It is a front plan view of the present invention.

[0027] Figure 4 It is a three-dimensional diagram of the present invention from an upward angle.

[0028] Figure 5 It is a top-down perspective view of the present invention.

[0029] Figure 6 This is the second embodiment of the present invention.

[0030] The reference numerals in the figure are: 1. motor body shell, 2. wheel hub, 3. axial flow channel shell, 5. cardiac artery tube, 6. heart valve, 7. suture line, 11. first fan blade, 21. second fan blade, 31. flange part, 32. assembly hole, 41. lower suture body, 42. upper suture body, 61. heart valve root. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0032] Example 1 like Figure 1-Figure 6 As shown, the present invention provides a series ventricular assist circulation device with low thermal damage, including: a motor body shell 1, an axial flow channel shell 3 coaxially sleeved outside the motor body shell, a hub 2 connected to the lower end of the motor body shell 1, and the hub 2 is circumferentially connected with a second fan blade 21, and also includes a first fan blade 11, the spiral outer edge line of the 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 blade surface of the first fan blade 11 is fixedly connected along the outer circumferential surface of the motor body shell 1; there is a free rotation gap between the spiral outer edge line of the 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 blade surface of the second fan blade 21 is fixedly connected along the circumference of the hub 2; the spiral direction of the first fan blade 11 is opposite to the spiral direction of the second fan blade 21.

[0033] like Figure 1 As shown, the motor housing 1 is extended and passes through the heart valve 6. The hub 2 and the second blade 21 form an impeller. The motor housing 1 and the impeller are designed separately with the heart valve 6 as the boundary. The motor body is located in the upper area of ​​the heart valve 6, and the hub 2 and the second blade 21 are located in the lower area of ​​the heart valve 6. The axial flow channel shell 3 is sleeved outside the motor housing 1. The area between the axial flow channel shell 3 and the motor housing 1 forms a blood flow channel. The motor housing 1 is extended to reduce its diameter so that the blood flow channel is as large as possible. The second blade rotates in the blood flow channel to drive the blood upward to form pressure. When the heart valve 6 is opened, blood is sprayed from the inside of the ventricle into the heart artery.

[0034] like Figure 3As shown, there is a free rotation gap between the spiral outer edge of the blade surface of the second blade 21 and the inner wall surface of the axial flow channel shell 3, while the spiral outer edge of the blade surface of the first blade 11 is fixedly connected along the inner wall surface of the axial flow channel shell 3, and the spiral inner edge of the blade surface of the first blade 11 is fixedly connected along the outer peripheral surface of the motor housing 1. In the design, it is necessary to consider preventing the blood from rotating due to the second blade 21, and in order to increase the support, heat conduction and heat dissipation of the motor housing 1, the spiral inner edge increases the line contact length with the motor housing 1 as much as possible. Figure 3 In the figure, the inner edge of the spiral appears to be horizontal, but in fact it is a line that spirals downward, and its length is much longer than the projection length in the top view direction.

[0035] The number of the second blades 21 is 2, 3 or more. The number of the first blades 11 and the second blades 21 can generally be the same or different.

[0036] Such as 1. Figure 2 and Figure 3 , the outer diameter of the axial flow channel shell 3 is slightly equal to the cardiac artery tube 5, and the upper end of the axial flow channel shell 3 adopts a flanging process to form a flanging portion 31. The flanging portion should not be too wide, and the size of the assembly hole 32 of the upper and lower axes can be formed on the flanging portion. The flanging portion can be a horizontal straight line type or an edge curved type flanging, and at least one plane above and below it is provided with a suture body as a medium to be sutured and connected with the heart valve root 61 or / and the cardiac artery tube 5 by suture thread 7. The assembly hole 32 is also used for the suture thread 7 to pass through. The present invention uses the heart valve root 61 to hoist the axial flow channel shell 3. The heart valve root 61 is the root part of the heart valve 6, which generally grows horizontally perpendicular to the cardiac artery tube 5 and is relatively thick. The heart valve root 61 has stronger toughness and can carry heavier devices, which is more beneficial to the convenience of suturing operation, subsequent safety of use, and suture area. Compared with the traditional method of directly suturing on the inner wall of the cardiac artery tube, it causes less damage to the cardiac artery tube. Figure 2 As shown, the sutures in the present invention are all vertical sutures and will not appear on the inner wall of the axial flow channel shell 3, thereby avoiding the risk of thrombosis.

[0037] like Figure 2 As shown, the suture body includes a lower suture body 41 and an upper suture body 42, wherein the lower suture body 41, the flange part, and the upper suture body 42 are stacked up and down to form a stacked assembly, wherein the heart valve root 61 is also a horizontal human tissue structure, and the heart valve root 61, the lower suture body 41, the flange part, and the upper suture body 42 are stacked up and down to form a stacked assembly. It forms a hanging mode, and the flange part is equivalent to being embedded in the stacked assembly.

[0038] like Figure 4 As shown, Figure 4The heart valve 6, the heart valve root 61, and the upper suture body 42 are not shown. The axial flow channel shell 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 shell 3, the axial direction of the cardiac artery tube 5, and the axial direction of the motor body shell are all up and down directions.

[0039] The design principle of the present invention is as follows: The existing serial ventricular assist circulation device includes: a motor housing, an axial flow channel shell 3 coaxially sleeved outside the motor housing, a hub connected to the lower end of the motor housing, a second fan blade circumferentially connected to the hub, a first fan blade that is not in contact with the motor housing, and is only arranged on one side of the inner wall of the axial flow channel shell 3, and only serves to eliminate the blood rotation caused by the second fan blade, and a support rod that suspends the motor housing 1 on the central axis of the axial flow channel shell, and the motor housing 1 is extended through the aortic valve, and a connecting rod and a fixing ring are arranged at the upper end of the motor housing 1 to fix the upper end of the motor housing 1. The heat dissipation path of the device only relies on the motor housing 1, and increases the upward size of the motor housing 1, thereby improving the heat dissipation effect. The overall weight of the device is relatively large. The support path I of the device includes the motor housing, the support rod, and the axial flow channel shell connected in sequence, and the support path II of the device includes the motor housing, the connecting rod, and the fixing ring connected in sequence.

[0040] The present invention bridges the first fan blade between the motor housing and the axial flow channel shell, thereby introducing the heat of the motor housing into the first fan blade and the axial flow channel shell, so that the first fan blade and the axial flow channel shell can also be used as heat dissipation surfaces to increase the heat dissipation area of ​​blood contact, and at the same time, the length of the motor housing does not need to be increased, and the motor housing can even be further reduced in diameter to increase the blood flow area. The present invention constructs a new heat dissipation path: the motor housing, the first fan blade, and the axial flow channel shell. The first fan blade is a fixed structure, which does not rotate, one side is fixed to the motor housing, and the other side is fixed to the axial flow channel shell. Greatly increased heat dissipation area. At the same time, the first fan blade also plays a role in supporting the motor housing, eliminating the support rod, connecting rod, and fixed ring in the prior art. A new support path is constructed: the motor housing, the first fan blade, and the axial flow channel shell. The support path overlaps with the heat dissipation path and plays a dual function. The spiral direction of the first fan blade is opposite to the spiral direction of the second fan blade, which plays a role in eliminating 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 blood rotation resistance. The traditional first fan blade is only a guide vane connected to the inner wall of the axial flow channel shell on one side, which only plays the role of blood rotation resistance. In comparison, the present invention does not rely on extending the length or diameter of the motor shell to increase the area to prevent the motor shell from accumulating, but proposes a new technical method of heat dissipation by means of the axial flow channel shell, and the device can be provided with a shorter motor shell and a motor shell with a smaller diameter.

[0041] Preferably, the upper end of the axial flow channel shell 3 is provided with a radially outward flange portion 31, and the upper surface and / or lower surface of the flange portion 31 are pre-installed or temporarily assembled with a suture body, 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.

[0042] Preferably, 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, and the upper suture body 42 and / or the lower suture body 41 are pre-installed or temporarily assembled on the upper and / or lower sides of the flange portion 31 after the suture line 7 passes through the assembly holes 32.

[0043] In the existing installation technology of the axial flow channel shell 3, such as CN1253837A, the general practice is to set a suture body on the circumferential surface of the axial flow channel shell 3, and then suture and connect it with the inner wall of the aorta through the suture body. However, the general suture body is not firmly set on the circumferential surface of the axial flow channel shell 3, and there is a risk of slipping. The general practice is to set a thread hole horizontal to the axial hole, and sew the suture body on the circumferential surface through the thread hole horizontal to the axial hole. However, if the thread hole horizontal to the axial hole is set, the suture will pass through the thread hole and be exposed on the inner wall of the axial flow channel shell 3. Therefore, the suture will be exposed in the blood flow channel. Experimental studies have found that this will cause blood to form a plug based on the suture and accumulate in the flow channel. Therefore, CN1253837A does not use the thread hole horizontal to the axial hole, but adopts the mortise and tenon conception, and the circumferential surface of the axial flow channel shell 3 is recessed in the radial direction, so that the suture body is stuck in the inner recess to form a clamping connection, but because the suture body is a braided structure, it itself has high flexibility and easy deformation characteristics. Therefore, this method still has the risk of slipping. In order to avoid the technical concept of mortise and tenon, which is easy to slip, and to adopt the technical concept of suture connection, and to avoid the problem of the suture being exposed in the blood flow channel, the present invention adopts the technical concept of flanging, that is, radial (horizontal) flanging is performed on the upper end of the axial flow channel shell 3 to form a horizontally extended flanging portion 31, and then the suture body is overlapped on the upper surface or / and the lower surface of the flanging portion 31, wherein an assembly hole 32 having the same axial direction as the axial direction of the axial flow channel shell is further provided on the flanging portion 31, and the suture thread passes through the assembly hole 32 in an up-and-down winding manner to fix the suture body on the upper surface or / and the lower surface of the flanging portion 31, and the suture thread will not appear in the flow channel of the axial flow channel shell 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 flange part, place the suture body on the upper surface or / and lower surface of the flange part 31, use the suture thread to pass through the assembly hole 32 in an up-and-down manner, and fix the suture body on the upper surface or / and lower surface of the flange part 31. The formed structure is called an assembly body. 2. In vivo, use the suture thread to sew the suture body to the heart artery tube.

[0044] In the present invention, due to the use of sutures fixed on the upper surface or / and lower surface of the flange portion 31, wherein the upper suture 42 is sutured with the lower surface of the heart valve root, it is convenient to increase the suture area. A positive downward force is formed, avoiding suture with the heart artery tube to form an oblique force. Among them, the lower suture 41 is sutured with the heart artery tube to form a supporting force, which is equivalent to constructing a slot in the heart artery tube, and then inserting the flange portion into the slot to increase the installation stability of the device.

[0045] Preferably, the outer diameter of the flange portion 31 is preset to be the inner diameter of the cardiac artery tube.

[0046] Preferably, the suture is an annular medical polyester braid or an annular polytetrafluoroethylene braid or an annular artificial blood vessel.

[0047] Preferably, the upper end of the motor housing 1 extends from the upper end of the axial flow channel housing 3 and is located below or above the aortic valve.

[0048] Preferably, 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.

[0049] Preferably, the axial flow channel shell 3, the second fan blades 21, and the motor body shell 1 are all made of high thermal conductivity materials.

[0050] The sum of the lengths of the spiral inner edges of all 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 first blades 11 is greater than or equal to the inner circumference of the axial flow channel shell 3. The thickness of the first blade 11 close to the motor housing 1 is greater than the thickness of the side close to the axial flow channel shell 3.

[0051] Among them, the high thermal conductivity material body is all metal material, the axial flow channel shell 3 serves as the base, the second fan blade 21 serves as the connector, and the motor body shell 1 serves as the supported object. 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 line and the spiral outer edge line 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 ascending structure, both sides of it are line connections rather than point connections. At the same time, the thickness of the first fan blade 11 on the side close to the motor body shell 1 can be further increased to be greater than the thickness on the side close to the axial flow channel shell 3 to increase its thermal conductivity.

[0052] Embodiment 2: like Figure 6As shown, the motor housing 1 is not extended and does not pass through the heart valve 6. The hub 2 and the second blades 21 form an impeller. The motor body is located in the area below the heart valve 6. The hub 2 and the second blades 21 are also located in the area below the heart valve 6. The axial flow channel shell 3 is sleeved outside the motor housing 1. The rest of the structure is the same as that of Example 1.

[0053] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present 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) is opposite to the spiral direction of the second fan blade (21).

2. The low thermal damage tandem ventricular assist circulation device according to claim 1, characterized in that: The upper end of the axial flow channel shell (3) is provided with a radially outward flange portion (31), and the upper surface or / and the lower surface of the flange portion (31) are pre-installed or temporarily assembled with a suture body, 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.

3. The low thermal damage tandem ventricular assist circulation device according to claim 2, characterized in that: The flange portion (31) is provided with a plurality of assembly holes (32), the axial direction of the assembly holes (32) being the same as the axial direction of the axial flow channel shell, and the upper suture body (42) and / or the lower suture body (41) are pre-installed or temporarily assembled on the upper and / or lower sides of the flange portion (31) after the suture thread (7) passes through the assembly holes (32).

4. The low thermal injury tandem ventricular assist circulation device according to claim 2, 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.

5. The low thermal damage tandem ventricular assist circulation device according to claim 2, 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.

6. The low thermal injury tandem ventricular assist circulation device according to claim 2, 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).

7. The low thermal injury tandem ventricular assist circulation device according to claim 2, 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.

8. The low thermal injury tandem ventricular assist circulation device according to any one of claims 1 to 7, 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.

9. The low thermal injury tandem ventricular assist circulation device according to any one of claims 1 to 7, 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).

10. The low thermal injury tandem ventricular assist circulation device according to any one of claims 1 to 7, 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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