Pump housing, pump body and ventricular assist device

Abstract

The application provides a pump shell, which comprises a first shell, a second shell and an assembling part, the second shell is connected with the first shell to form a receiving cavity capable of receiving an impeller, at least one of the first shell and the second shell is provided with a groove with an opening facing the receiving cavity, the groove has a first side surface, the assembling part comprises a connecting assembling surface and a second side surface; the assembling part is accommodated in the groove, the assembling surface can be opposite to the surface of the impeller received in the receiving cavity, and the second side surface is in contact with the first side surface.The pump shell provided by the application is installed on at least one of the first shell and the second shell through the additionally provided assembling part, thus the first shell, the second shell and the assembling part can be machined respectively, the flatness of the assembling surface can be controlled, the basis for the substantial improvement of the flatness of the assembling surface is provided, and the thrombus can be avoided on the basis of improving the overall operation accuracy of the ventricular assist device.The application further provides a pump body and a ventricular assist device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a pump shell, a pump body and a ventricular assist device. BACKGROUND

[0002] The ventricular assist device is a main medical device for treating cardiovascular diseases (such as cardiogenic shock, heart failure, etc.), and a controller in the ventricular assist device controls the energization of a motor coil to generate a rotating electromagnetic field to drive an impeller in a containing cavity to rotate, so that blood is sucked into a liquid inlet of the ventricular assist device, discharged from a liquid outlet after the impeller, and thus the circulation of blood is realized.

[0003] However, the conventional ventricular assist device has a high risk of collision between the impeller and the cavity wall of the containing cavity, resulting in low overall operation precision of the ventricular assist device. SUMMARY

[0004] One technical problem solved by the present application is how to improve the operation precision of the ventricular assist device, and the present application solves the above technical problem through the following technical scheme.

[0005] In a first aspect, the present application provides a pump shell, comprising:

[0006] a first shell;

[0007] a second shell connected with the first shell to enclose a containing cavity capable of containing an impeller, at least one of the first shell and the second shell being provided with a groove with an opening facing the containing cavity, the groove having a first side surface;

[0008] an assembly part comprising an assembly surface and a second side surface connected with each other, the assembly part being accommodated in the groove, the assembly surface being capable of being opposite to a surface of the impeller contained in the containing cavity, and the second side surface being in contact with the first side surface.

[0009] In one embodiment, a normal projection of the assembly surface on a surface of the impeller facing the assembly part covers the surface of the impeller facing the assembly part.

[0010] In one embodiment, the flatness of the assembly surface is 0.002-0.004 mm.

[0011] In one embodiment, the first shell is provided with the groove, and the first shell further comprises an upper cavity surface for enclosing the containing cavity, the upper cavity surface being arranged around the groove, the upper cavity surface being connected with the first side surface, and the assembly surface being flush with the upper cavity surface.

[0012] And / or, the second shell is provided with the recess, and the second shell further comprises a lower cavity surface for enclosing the receiving cavity, the lower cavity surface is arranged around the recess, and the lower cavity surface is connected with the first side ring surface, and the assembly surface is flush with the lower cavity surface.

[0013] In one of the embodiments, at least one of the first shell and the second shell is provided with a storage groove and a storage groove between the assembly part, the storage groove is communicated with the recess, and the storage groove and the storage groove are arranged in the circumferential direction perpendicular to the axis of the assembly part.

[0014] In one of the embodiments, at least one of the first shell and the second shell is further provided with an overflow groove between the assembly part, the overflow groove is communicated with the storage groove and is spaced from the storage groove, and the depth of the overflow groove is greater than the depth of the storage groove.

[0015] In one of the embodiments, the first side ring surface and the second side ring surface are both inclined relative to the axis of the first side ring surface, wherein:

[0016] The inclination angle of the first side ring surface relative to the axis of the assembly part is α, wherein 10°≤α≤20°; and / or, the inclination angle of the second side ring surface relative to the axis of the assembly part is β, wherein 10°≤β≤20°.

[0017] In one of the embodiments, the assembly part comprises a first assembly part and a second assembly part, the first assembly part is arranged on the first shell, the second assembly part is arranged on the second shell, and the side of the second assembly part away from the first assembly part is provided with a convex ring, the convex ring is adapted to be fixedly connected with the second shell, and the inner circumferential surface of the convex ring can be adapted to contact the outer circumferential surface of the pole shoe.

[0018] In a second aspect, the application further provides a pump body, which comprises an impeller and any of the pump shells described above, and the impeller is rotatably arranged in the receiving cavity.

[0019] In one of the embodiments, the impeller comprises a body and a cover plate, the cover plate is arranged on the body and opposite to the assembly surface, and the material of the cover plate is ceramic.

[0020] And / or, the material of the assembly part is ceramic.

[0021] In a third aspect, the application further provides a ventricular assist device, which comprises a motor and a pump body, the motor is connected to the pump body, and the motor can generate a rotating magnetic field to drive the impeller to rotate.

[0022] Compared with the first shell or the second shell in the traditional pump body without being provided with the groove, and without the separate assembly matched with the groove, the application additionally provides the assembly, and the assembly is installed on at least one of the first shell and the second shell, so that the first shell, the second shell and the assembly can be separately machined, thereby the flatness of the assembly surface can be controlled, and the flatness of the assembly surface is greatly improved. For example, compared with the traditional pump shell, the flatness of the assembly surface of the pump shell is improved from 0.01-0.02mm to 0.002-0.004mm. The improvement of the flatness reduces the risk of collision between the impeller and the inner cavity surface, improves the overall operation accuracy of the pump body and the ventricular assist device, reduces the damage to the blood, and increases the manufacturing stability of the pump body and the ventricular assist device. In addition, when the assembly is accommodated in the groove, the second side surface of the assembly is in contact with the first side surface of the groove, so as to avoid the gap between the assembly and the first shell or the second shell, thereby avoiding the thrombus. In summary, the pump shell, the pump body and the ventricular assist device provided by the application can improve the overall operation accuracy of the ventricular assist device and avoid the thrombus. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic diagram of a ventricular assist device provided by the application is shown in the figure.

[0024] Figure 2 A structural schematic diagram of a pump body of the ventricular assist device shown in the figure is shown in the figure. Figure 1

[0025] Figure 3 An exploded view of the pump body shown in the figure is shown in the figure. Figure 2

[0026] Figure 4 A longitudinal sectional view of the pump body shown in the figure is shown in the figure. Figure 2

[0027] Figure 5 A longitudinal sectional view of the pump body shown in the figure is shown in the figure. Figure 4

[0028] Figure 6 A local enlarged view at A is shown in the figure. Figure 5

[0029] Figure 7 A structural schematic diagram of the first shell of the ventricular assist device shown in the figure is shown in the figure. Figure 1

[0030] Figure 8 A structural schematic diagram of the second shell of the ventricular assist device shown in the figure is shown in the figure. Figure 1

[0031] Figure 9 Figure 1 ​​​​​​​​An assembly of the ventricular assist device shown in a structural schematic view;

[0032] Figure 10 For Figure 9 An assembly shown in a structural schematic view from another perspective. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, a more complete description of the application will be provided below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "inner", "outer", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0035] The present inventors have found that for a conventional pump body of a ventricular assist device, the pump housing of the pump body includes a first housing and a second housing, and an impeller rotates in a suspended state relative to the pump housing, the first housing and the second housing each have an inner surface arranged towards the impeller, and the inner surface is arranged in an axial direction of the impeller and spaced from the impeller. The impeller rotates in a space enclosed by the first housing and the second housing. However, the first housing and the second housing are of an integral structure, so that the inner surface has poor flatness due to the excessively large machining area, and the rotating impeller is more likely to collide with the inner surface, resulting in low running accuracy of the entire ventricular assist device and reducing the manufacturing stability of the pump body and the ventricular assist device.

[0036] In order to improve at least some of the above problems, the present application provides a pump housing, a pump body and a ventricular assist device, by additionally arranging an assembly, and the assembly is mounted to at least one of the first housing and the second housing, so that the first housing, the second housing and the assembly can be machined separately, thereby being able to control the flatness of the assembly surface, and providing a basis for a substantial improvement in the flatness of the assembly surface. By contacting the second side ring surface of the assembly with the first side ring surface of the groove, a gap is avoided between the assembly and the first housing or the second housing, thereby avoiding the occurrence of thrombus. The pump housing, the pump body and the ventricular assist device provided by the present application are described below in combination with the specific embodiments and the drawings of the specification.

[0037] Reference Figures 1 to 5The pump housing 110 comprises a first housing 210, a second housing 220, and an assembly piece 300. The second housing 220 is connected with the first housing 210 to enclose a receiving cavity 230 capable of receiving the impeller 120. At least one of the first housing 210 and the second housing 220 is provided with a groove with an opening facing the receiving cavity 230, and the groove has a first side surface 202. The assembly piece 300 comprises an assembly surface 301 and a second side surface 302 connected with each other. The assembly piece 300 is accommodated in the groove, the assembly surface 301 is capable of being opposite to a surface of the impeller 120 received in the receiving cavity 230, and the first side surface 202 is in contact with the second side surface 302, for example, the first side surface 202 is tightly attached to the second side surface 302, or the first side surface 202 abuts against the second side surface 302.

[0038] Compared with the first housing or the second housing in the conventional pump body without the groove and without the separate assembly piece matched with the groove, the application additionally provides the assembly piece 300, and the assembly piece 300 is installed on at least one of the first housing 210 and the second housing 220. Therefore, the first housing 210, the second housing 220, and the assembly piece 300 can be separately machined, so that the flatness of the assembly surface 301 can be controlled, and a basis for greatly improving the assembly surface 301 is provided. For example, compared with the conventional pump housing, the flatness of the assembly surface 301 of the split pump housing 110 provided by the application is improved from 0.01-0.02 mm to 0.002-0.004 mm. The improvement of the flatness reduces the risk of collision between the impeller 120 and the inner cavity surface, improves the overall operation accuracy of the pump body 11 and the ventricular assist device 10, reduces the damage to the blood, and increases the manufacturing stability of the pump body 11 and the ventricular assist device 10. In addition, when the assembly piece 300 is accommodated in the groove, the second side surface 302 of the assembly piece 300 is in contact with the first side surface 202 of the groove, so as to avoid the gap between the assembly piece 300 and the first housing 210 or the second housing 220, thereby avoiding the thrombus.

[0039] In the embodiment, the first housing 210 and the second housing 220 are both provided with the groove, and the assembly piece 300 comprises a first assembly piece 310 and a second assembly piece 320. The first assembly piece 310 is arranged on the first housing 210 and accommodated in the corresponding groove, and the second assembly piece 320 is arranged on the second housing 220 and accommodated in the corresponding groove. In other embodiments, one of the first housing 210 and the second housing 220 is provided with the groove, and the other one is not provided with the groove, and the assembly piece 300 is accommodated in the groove. For the convenience of description, the groove on the first housing 210 is defined as the first groove 212, and the groove on the second housing 220 is defined as the second groove 222.

[0040] Referring to Figure 1 , Figure 2 and Figure 4The ventricular assist device 10 includes a pump body 11 and a motor 12. The pump body 11 includes a pump casing 110 and an impeller 120. The pump casing 110 includes a first housing 210, a second housing 220, and an assembly 300. The first housing 210 and the second housing 220 can be connected separately, that is, the independently formed first housing 210 and the second housing 220 are fixedly connected to each other. The pump casing 110 also includes an inlet pipe 410 and an outlet pipe 420. The first assembly 310 and the inlet pipe 410 are both disposed in the first housing 210, the second assembly 320 is disposed in the second housing 220, and the outlet pipe 420 is connected to both the first housing 210 and the second housing 220. The first housing 210, the second housing 220, the first assembly 310, and the second assembly 320 together form a receiving cavity 230, and the impeller 120 is rotatably disposed within the receiving cavity 230. The motor 12 is fixedly connected to the second housing 220, and the motor 12 can generate a rotating magnetic field to drive the impeller 120 to rotate. When the motor 12 drives the impeller 120 to rotate, the impeller 120 generates pump suction, causing liquid to flow from the inlet pipe 410 into the receiving cavity 230. The liquid in the receiving cavity 230 will then flow out from the outlet pipe 420, thus realizing the pumping function of the ventricular assist device 10. In other embodiments, the first housing 210 and the second housing 220 can also be integrally formed.

[0041] See Figure 4 , Figure 5 and Figure 7 In some embodiments, the first housing 210 is provided with a groove, and the first housing 210 also includes an upper cavity surface 211 for forming a receiving cavity 230. The upper cavity surface 211 is connected to the first side annular surface 202 and is disposed around the first groove 212.

[0042] At least one of the first housing 210 and the second housing 220 is provided with a glue storage tank between itself and the assembly 300. In this embodiment, glue storage tanks are provided between the first housing 210 and the first assembly 310, and between the second housing 220 and the second assembly 320. For ease of description, the glue storage tank between the first housing 210 and the first assembly 310 is defined as the first glue storage tank 213 (e.g., Figure 6 A second glue storage tank 223 is provided between the second housing 220 and the second assembly 320.

[0043] The first glue storage tank 213 is formed by the bottom wall of the first groove 212 recessed along the thickness direction of the first shell 210. Obviously, the first glue storage tank 213 is connected to the first groove 212. The first glue storage tank 213 is set close to the side wall of the first groove 212. Glue can be injected into the first glue storage tank 213, so the first glue storage tank 213 can serve as a space for containing glue.

[0044] See Figure 6The side of the first shell 210 away from the impeller 120 can also be used to mount a magnetic stator ring 510, wherein the magnetic stator ring 510 can cooperate with a magnetic rotor ring 520 mounted in the impeller 120 to provide a force for suspending the impeller 120.

[0045] Referring to Figure 5 , Figure 9 and Figure 10 The first assembly 310 cooperates with the first recess 212, which can limit the installation of the first assembly 310 and improve the installation efficiency and accuracy of the first assembly 310. On the other hand, the first assembly 310 makes full use of the space of the first recess 212, and tries to reduce the occupied space of the first assembly 310 outside the first recess 212, so as to reduce the volume of the pump shell 110 to realize miniaturization design. During the installation of the first assembly 310, the first assembly 310 can at least partially shield the first glue storage groove 213, and the first glue storage groove 213 can be filled with glue liquid. The glue liquid will solidify to form a glue layer, and the glue layer can fixedly connect the first assembly 310 and the first shell 210.

[0046] For the convenience of description, the assembly surface of the first assembly 310 is defined as an upper assembly surface 311, which is used to define part of the boundary of the accommodation cavity 230. The upper assembly surface 311 is arranged along the axial direction of the impeller 120 and is spaced apart from the impeller 120 along the axial direction of the impeller 120 when the impeller 120 rotates. The upper assembly surface 311 and the upper cavity surface 211 are located on the same side of the impeller 120, for example, on the upper side of the impeller 120. Along the axial direction of the impeller 120, for example, the distance from the upper assembly surface 311 to the impeller 120 can be equal to the distance from the upper cavity surface 211 to the impeller 120, that is, the upper assembly surface 311 and the upper cavity surface 211 are flush with each other, which can reduce the risk of collision between the impeller 120 and the upper assembly surface 311. For another example, the distance from the upper assembly surface 311 to the impeller 120 can be less than the distance from the upper cavity surface 211 to the impeller 120, that is, the upper assembly surface 311 is arranged closer to the impeller 120 than the upper cavity surface 211. When the impeller 120 rotates in the accommodation cavity 230 in a magnetic suspension manner, the impeller 120 will be spaced apart from the upper cavity surface 211 and the upper assembly surface 311.

[0047] In the ventricular assist device 10 in the above embodiment, the first housing 210 and the first fitting 310 are connected separately, so that the first housing 210 and the first fitting 310 can be machined separately. In the machining of the first housing 210, the area of the upper cavity surface 211 is obviously smaller than that of the inner surface, so that the machining precision of the upper cavity surface 211 can be improved, and the flatness of the upper cavity surface 211 can be improved. Similarly, in the machining of the first fitting 310, the area of the upper fitting surface 311 is obviously smaller than that of the inner surface, so that the machining precision of the upper fitting surface 311 can be improved, and the flatness of the upper fitting surface 311 can be improved. After the first housing 210 and the first fitting 310 are machined, the flatness of the fitting surface 311 can be 0.002mm-0.004mm, for example, the flatness of the fitting surface 311 can be 0.002mm, 0.003mm or 0.004mm, etc. The flatness of the upper fitting surface 311 is less than or equal to the flatness of the upper cavity surface 211. Since the flatness of the upper fitting surface 311 and the upper cavity surface 211 is improved, the probability of collision between the upper fitting surface 311, the upper cavity surface 211 and the impeller 120 is reduced during the rotation of the impeller 120, so that the operation precision of the entire ventricular assist device 10 is improved, and the manufacturing stability of the pump body 11 and the ventricular assist device 10 is improved.

[0048] In some embodiments, the first fitting 310 can be made of ceramic material. The ceramic material is a completely bio-inert material, so that the ventricular assist device 10 does not affect the blood during operation. The ceramic material has high hardness and wear resistance, which can reduce the wear risk of the ventricular assist device 10 during startup and long-term operation. The ceramic material is a non-metallic material with good insulation performance, which can reduce the interference with the operation of the motor 12. In addition, the flatness of the upper fitting surface 311 can be improved more easily during the machining of the ceramic material.

[0049] Referring to Figure 4The first assembly 310 and the impeller 120 can be coaxially arranged, and the upper assembly surface 311 can cover the surface of the impeller 120 arranged towards the first assembly 310 in the axial direction of the impeller 120. It can be understood that the outer diameter of the first assembly 310 is greater than the outer diameter of the impeller 120, so that the upper assembly surface 311 covers the entire impeller 120 in the axial direction of the impeller 120. In the case that the flatness of the upper assembly surface 311 is relatively better than that of the upper cavity surface 211, when the upper assembly surface 311 covers the surface of the impeller 120 arranged towards the first assembly 310 in the axial direction of the impeller 120, the impeller 120 can be prevented from colliding with the upper cavity surface 211, the stability of the impeller 120 in operation can be improved, the probability of collision between the impeller 120 and the upper assembly surface 311 can be reduced, and the operation accuracy of the entire ventricular assist device 10 can be improved.

[0050] Referring to Figure 5 and Figure 6 At least one of the first housing 210 and the second housing 220 and the assembly 300 are further provided with a glue storage groove 312. In the embodiment, the glue storage groove 312 is arranged between the first housing 210 and the first assembly 310, and the glue storage groove 312 and the first glue storage groove 213 are arranged in a circumferential direction perpendicular to the axis of the assembly 300. The axis of the assembly 300 refers to the normal of the plane where the assembly 300 is located. The glue storage groove 312 can serve as a space for containing glue, and after the glue storage groove 312 is filled with glue, the glue will solidify to form a glue layer, which can fixedly connect the first assembly 310 and the first housing 210, thereby further improving the connection strength between the first assembly 310 and the first housing 210. In an implementation manner, the glue storage groove 312 can also be arranged between the second housing 220 and the second assembly 320. In another implementation manner, the number of glue storage grooves 312 can be two, one of which is arranged between the first housing 210 and the first assembly 310, and the other is arranged between the second housing 220 and the second assembly 320.

[0051] In the embodiment, the glue storage groove 312 is arranged in the first assembly 310, and the position of the glue storage groove 312 corresponds to the position of the moving magnetic ring 520, so that the moving magnetic ring 520 can cover the glue storage groove 312 in the axial direction of the impeller 120. For example, the glue storage groove 312 is recessed from the surface of the first assembly 310 towards the first recess 212, which avoids the first housing 210 being too thin due to the arrangement of the first housing 210, guarantees the strength of the first housing 210, and enables the moving magnetic ring 520 to be stably mounted on the first housing 210. In other embodiments, the glue storage groove 312 can also be arranged in the first housing 210, and can also be arranged in the first assembly 310 and the first housing 210.

[0052] In some embodiments, an overflow groove 313 is further provided between at least one of the first shell 210 and the second shell 220 and the assembly 300. In the present embodiment, the overflow groove 313 is provided between the first shell 210 and the first assembly 310, and the overflow groove 313 is in communication with the storage groove 312 and is spaced from the first storage groove 213. The depth of the overflow groove 313 is greater than the depth of the storage groove 312, and the overflow groove 313 can receive excess glue liquid in the storage groove 312, and can also discharge gas in the storage groove 312, thereby reducing the air holes in the glue layer formed in the storage groove 312, and further improving the connection strength of the glue layer to the first assembly 310 and the first shell 210. In the present embodiment, the overflow groove 313 is formed by recessing the bottom wall surface of the storage groove 312, that is, the overflow groove 313 is provided on the first assembly 310, which ensures the strength of the first shell 210. In other embodiments, the overflow groove 313 can also be provided on the first shell 210, or can be provided on both the first assembly 310 and the first shell 210. In one implementation, the overflow groove 313 can also be provided between the second shell 220 and the second assembly 320. In another implementation, the number of overflow grooves 313 can be two, one of which is provided between the first shell 210 and the first assembly 310, and the other is provided between the second shell 220 and the second assembly 320.

[0053] Referring to Figure 4 , Figure 5 and Figure 8 , in some embodiments, the second shell 220 is provided with a recess, and the second shell 220 further includes a lower cavity surface 221 for enclosing the receiving cavity 230, the lower cavity surface 221 is provided around the second recess 222, and the lower cavity surface 221 is connected to the first side ring surface 202.

[0054] The second storage groove 223 can be provided on the second shell 220, and the second storage groove 223 is formed by recessing the bottom wall surface of the second recess 222 in the thickness direction of the second shell 220. Obviously, the second storage groove 223 is in communication with the second recess 222, and the second storage groove 223 is provided close to the side wall surface of the second recess 222. The second storage groove 223 can be filled with glue liquid, so the second storage groove 223 can serve as a space for containing glue liquid. The bottom wall surface of the second recess 222 is further recessed in the thickness direction of the second shell 220 to form a through hole 225, the through hole 225 penetrates the second shell 220 in the thickness direction, and the second storage groove 223 is provided around the through hole 225.

[0055] Referring to Figure 5 , Figure 9 and Figure 10The second assembly part 320 is matched with the second groove 222, and the second groove 222 can limit the installation of the second assembly part 320, thereby improving the installation efficiency and precision of the second assembly part 320. On the other hand, the second assembly part 320 can make full use of the space of the second groove 222, and the occupied space of the second assembly part 320 outside the second groove 222 is reduced as much as possible, thereby reducing the volume of the pump shell 110 to realize the miniaturization design. During the installation of the second assembly part 320, the second assembly part 320 can at least partially shield the second glue storage groove 223, and the glue solution can be injected into the second glue storage groove 223. The glue solution will solidify to form a glue layer, and the glue layer can fixedly connect the second assembly part 320 and the second shell 220.

[0056] For the convenience of description, the assembly surface of the second assembly part 320 is defined as a lower assembly surface 321, and the lower assembly surface 321 is used to define part of the boundary of the accommodation cavity 230. The lower assembly surface 321 is arranged along the axial direction of the impeller 120 and faces the impeller 120. When the impeller 120 rotates, the lower assembly surface 321 is arranged to be spaced apart from the impeller 120 along the axial direction of the impeller 120. The lower assembly surface 321 and the lower cavity surface 221 are located on the same side of the impeller 120, for example, on the lower side of the impeller 120. Along the axial direction of the impeller 120, for example, the distance from the lower assembly surface 321 to the impeller 120 can be equal to the distance from the lower cavity surface 221 to the impeller 120, that is, the lower assembly surface 321 and the lower cavity surface 221 are flush with each other, thereby reducing the risk of collision between the impeller 120 and the lower assembly surface 321. For another example, the distance from the lower assembly surface 321 to the impeller 120 can be less than the distance from the lower cavity surface 221 to the impeller 120, that is, the lower assembly surface 321 is arranged to be closer to the impeller 120 than the lower cavity surface 221. When the impeller 120 rotates in the magnetic suspension manner in the accommodation cavity 230, the impeller 120 will be kept in the spaced-apart relationship with the lower cavity surface 221 and the lower assembly surface 321, rather than in the contact relationship.

[0057] The second assembly part 320 also has an abutting surface 322, which is arranged along the thickness direction of the second assembly part 320 and is opposite to the upper assembly surface 311, such that the abutting surface 322 is arranged away from the impeller 120. The side of the second assembly part 320 away from the first assembly part 310 is provided with a convex ring 323, which is arranged on the abutting surface 322 and protrudes along the thickness direction. During the installation of the second assembly part 320, the abutting surface 322 abuts against the bottom wall surface of the second recess 222, and the convex ring 323 cooperates with the through hole 225 and is fixedly connected with the second housing 220. By arranging the convex ring 323, the structural strength of the entire second assembly part 320 can be improved, and the connection strength between the second assembly part 320 and the second housing 220 can also be improved. The inner circumferential surface of the convex ring 323 can be in contact with the outer circumferential surface of the pole shoe in the motor 12, so as to position the pole shoe and avoid arranging a positioning ring. That is, by arranging the second assembly part 320, the pole shoe can be positioned on the basis of improving the flatness of the lower assembly surface 321.

[0058] For the ventricular assist device 10 in the above embodiment, since the second housing 220 and the second assembly part 320 are connected separately, the second housing 220 and the second assembly part 320 can be machined independently. Therefore, during the machining of the second housing 220, the area of the lower cavity surface 221 is relatively small, and the machining precision of the lower cavity surface 221 can be improved, so as to improve the flatness of the lower cavity surface 221. Similarly, during the machining of the second assembly part 320, the area of the lower assembly surface 321 is relatively small, and the machining precision of the lower assembly surface 321 can be improved, so as to improve the flatness of the lower assembly surface 321. When the second housing 220 and the second assembly part 320 are machined, the flatness of the lower cavity surface 221 can reach 0.002 mm to 0.004 mm, for example, the specific value of the flatness of the lower cavity surface 221 can be 0.002 mm, 0.003 mm or 0.004 mm, etc. The flatness of the lower assembly surface 321 is less than or equal to the flatness of the lower cavity surface 221. Since the flatnesses of the lower assembly surface 321 and the lower cavity surface 221 are both improved, the probability of collision between the lower assembly surface 321, the lower cavity surface 221 and the impeller 120 during the rotation of the impeller 120 can be obviously reduced, so as to improve the operation precision of the entire ventricular assist device 10 and the manufacturing stability of the pump body 11 and the ventricular assist device 10.

[0059] In some embodiments, the second assembly 320 can be made of a ceramic material, which is a completely bio-inert material, so that the ventricular assist device 10 does not affect the blood when in operation. The ceramic material has high hardness and wear resistance, which can reduce the risk of wear of the ventricular assist device 10 during startup and long-term operation. The ceramic material is a non-metallic material with good insulation performance, which can reduce the interference with the operation of the motor 12. Moreover, during the processing of the ceramic material, the flatness of the lower assembly surface 321 can also be improved.

[0060] Referring to Figure 4 The second assembly 320 and the impeller 120 can both have a circular shape in the axial projection along the impeller 120, and the second assembly 320 and the impeller 120 are coaxially arranged. The lower assembly surface 321 can cover the entire impeller 120 in the axial projection along the impeller 120, and it can be understood that the outer diameter of the second assembly 320 is greater than the outer diameter of the impeller 120. When the lower assembly surface 321 covers the entire impeller 120 in the axial projection along the impeller 120, the lower cavity surface 221 can be prevented from covering the impeller 120, and the impeller 120 can be prevented from colliding with the lower cavity surface 221, thereby reducing the probability of collision between the impeller 120 and the lower assembly surface 321 and improving the operation accuracy of the entire ventricular assist device 10.

[0061] In some embodiments, referring to the storage groove 312 and the overflow groove 313 arranged between the first assembly 310 and the first housing 210, the storage groove 312 and the overflow groove 313 can also be arranged between the second assembly 320 and the second housing 220, and the storage groove 312 and the overflow groove 313 are arranged around the through hole 225. In this way, the connection strength of the second assembly 320 and the second housing 220 can be further improved.

[0062] Referring to Figure 7 In some embodiments, the first recess 212 also has a mounting bottom surface 203, the mounting bottom surface 203 is provided with a first storage groove 213, and the first side ring surface 202 is connected between the upper cavity surface 211 and the mounting bottom surface 203. The first side ring surface 202 and the second side ring surface 302 are adapted to each other, and the first side ring surface 202 and the second side ring surface 302 are both inclined relative to the axis of the assembly 300. Wherein, the first side ring surface 202 and the second side ring surface 302 are adapted to each other, which means that the shapes of the first side ring surface 202 and the second side ring surface 302 are the same or complementary, and they are arranged opposite to each other, for example, both are inclined surfaces, or one is a concave surface and the other is a convex surface. In this way, the assembly efficiency and accuracy of the first housing 210 (or the second housing 220) and the assembly 300 can be improved.

[0063] In the embodiment, the first side surface 202 is inclined to the axis of the fitting 300 by an angle a, where 10°≤a≤20°. The second side surface 302 is inclined to the axis of the fitting 300 by an angle β, where 10°≤β≤20°. Specifically, a and β can be equal or not equal, and the first side surface 202 and the second side surface 302 can be inclined to the axis of the fitting 300 by an angle within a certain range, for example, the difference between the angles of inclination of the two is within 1°. If a and β are too small, it is inconvenient to mount the first housing 210 (or the second housing 220) and the fitting 300, and if a and β are too large, the fitting 300 is likely to form sharp edges, causing the fitting 300 to be damaged due to stress concentration at the edges. Therefore, by setting a and β as described above, the mounting efficiency can be improved while avoiding damage to the fitting 300.

[0064] Referring to Figure 3 and Figure 4 In some embodiments, the impeller 120 includes a top plate 121, a bottom plate 122, and a body portion 123. The top plate 121 and the bottom plate 122 are cover plates of the impeller 120, i.e., the cover plates include the top plate 121 and the bottom plate 122. The cover plates are opposite the fitting surface 301, where the top plate 121 is opposite the upper fitting surface 311, and the bottom plate 122 is opposite the lower fitting surface 321. The body portion 123 is connected between the top plate 121 and the bottom plate 122, and the top plate 121 is disposed proximate to the first fitting 310, and the bottom plate 122 is disposed proximate to the second fitting 320. The moving magnet ring 520 is disposed between the top plate 121 and the body portion 123.

[0065] The top plate 121 and the bottom plate 122 can each be made of a ceramic material. The top plate 121 has a suspension surface 124 disposed toward the upper fitting surface 311, and the bottom plate 122 also has a suspension surface 124 disposed toward the lower fitting surface 321. Since the top plate 121 and the bottom plate 122 are made of a ceramic material, the suspension surfaces 124 of the top plate 121 and the bottom plate 122 are ceramic surfaces, and it is easier to ensure the flatness of the suspension surfaces 124 during the processing of the bottom plate 122 and the top plate 121, thereby reducing the probability of collision between the suspension surfaces 124 and the upper cavity surface 211 and the fitting surface 301, and improving the operation accuracy of the entire ventricular assist device 10. In other embodiments, for example, the impeller 120 can include the top plate 121 and the body portion 123, i.e., the impeller does not have the bottom plate 122, and the cover plates include the top plate 121. For another example, the impeller 120 can include the bottom plate 122 and the body portion 123, i.e., the impeller does not have the top plate 121, and the cover plates include the bottom plate 122.

[0066] In summary, by additionally arranging the assembling piece 300, and mounting the assembling piece 300 on at least one of the first shell 210 and the second shell 220, the first shell 210, the second shell 220 and the assembling piece 300 can be processed separately, so that the flatness of the assembling surface 301 can be controlled, and the assembling surface 301 can be greatly improved. For example, compared with the traditional pump shell, the flatness of the assembling surface 301 of the split pump shell 110 provided by the application is improved from 0.01-0.02mm to 0.002-0.004mm. The improvement of the flatness reduces the risk of collision between the impeller 120 and the inner cavity surface, improves the overall operation accuracy of the pump body 11 and the ventricular assist device 10, reduces the damage to the blood, and increases the manufacturing stability of the pump body 11 and the ventricular assist device 10. In addition, when the assembling piece 300 is accommodated in the groove, the second side ring surface 302 of the assembling piece 300 is in contact with the first side ring surface 202 of the groove, so as to avoid the gap between the assembling piece 300 and the first shell 210 or the second shell 220, thereby avoiding the thrombus.

[0067] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0068] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A pump housing, characterized in that The application relates to a pump comprising: a first shell; a second shell connected with the first shell to enclose a receiving cavity capable of receiving an impeller, at least one of the first shell and the second shell being provided with a groove opening towards the receiving cavity, the groove having a first side surface; and an assembly comprising a connected assembly surface and a second side surface, the assembly being accommodated in the groove, the assembly surface being capable of being opposite to a surface of the impeller received in the receiving cavity, the second side surface being in contact with the first side surface, a normal projection of the assembly surface on a surface of the impeller facing the assembly covering the surface of the impeller facing the assembly.

2. The pump housing of claim 1, wherein The flatness of the assembly surface is 0.002-0.004 mm; and / or the material of the assembly is ceramic.

3. The pump housing of claim 1, wherein, The first shell is provided with the groove, and the first shell further comprises an upper cavity surface for enclosing the receiving cavity, the upper cavity surface being arranged around the groove, the upper cavity surface being connected with the first side surface, and the assembly surface being flush with the upper cavity surface; and / or the second shell is provided with the groove, and the second shell further comprises a lower cavity surface for enclosing the receiving cavity, the lower cavity surface being arranged around the groove, the lower cavity surface being connected with the first side surface, and the assembly surface being flush with the lower cavity surface.

4. The pump housing of claim 1, wherein At least one of the first shell and the second shell and the assembly are provided with a storage groove and a storage groove, the storage groove being in communication with the groove, and the storage groove and the storage groove being arranged in a circumferential direction perpendicular to the axis of the assembly.

5. The pump housing of claim 4, wherein, At least one of the first shell and the second shell and the assembly are further provided with an overflow groove, the overflow groove being in communication with the storage groove and being spaced from the storage groove, the depth of the overflow groove being greater than the depth of the storage groove.

6. The pump housing of claim 1, wherein The first side surface and the second side surface are both inclined relative to the axis of the first side surface, wherein: the inclination angle of the first side surface relative to the axis of the assembly is alpha, and 10 DEG <= alpha <= 20 DEG; and / or the inclination angle of the second side surface relative to the axis of the assembly is beta, and 10 DEG <= beta <= 20 DEG.

7. The pump housing of claim 1, wherein The assembly comprises a first assembly and a second assembly, the first assembly being arranged on the first shell, the second assembly being arranged on the second shell, the side of the second assembly away from the first assembly being provided with a convex ring, the convex ring being adapted to be fixedly connected with the second shell, and the inner circumferential surface of the convex ring being capable of being in adaptive contact with the outer circumferential surface of a pole shoe.

8. A pump body characterized by, The application further relates to a pump comprising an impeller and the pump shell as claimed in any one of claims 1-7, the impeller being rotatably arranged in the receiving cavity.

9. The pump body of claim 8, wherein, The impeller comprises a body and a cover plate, the cover plate being arranged on the body and being opposite to the assembly surface, and the material of the cover plate being ceramic.

10. A ventricular assist device, characterized by The application further relates to a pump body as claimed in claim 8 or 9, and a motor connected with the pump body, the motor being capable of generating a rotating magnetic field to drive the impeller to rotate.

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