Heart pump and assembling method thereof

Abstract

The invention provides a heart pump and an assembling method thereof.The heart pump comprises a motor, a diffuser, an impeller and a pump shell, the motor comprises a stator assembly and a rotor assembly, the rotor assembly is rotationally arranged in the center of the stator assembly, and the heart pump is characterized in that the diffuser comprises a diffuser body and a front end connecting piece; the front end connecting piece is coaxially and fixedly connected with the stator assembly, and the diffuser body is coaxially connected with the end, away from the stator assembly, of the front end connecting piece. The front end of a rotating shaft of the rotor assembly penetrates through the diffuser and is fixedly connected with the impeller; the diffuser body and the impeller are coaxially sleeved with the pump shell, the pump shell comprises a pump shell body and a pump shell frame which are sequentially arranged, the diffuser body is arranged in the pump shell frame, and the impeller is located in the pump shell body. According to the invention, the coaxiality of the impeller, the diffuser and the motor of the heart pump is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a heart pump and an assembly method thereof. Background Art

[0002] For patients with heart failure, since the heart's blood pumping volume cannot maintain the blood supply required for normal metabolism of body tissues, tens of millions of patients die globally every year due to this. Currently, the more common treatment methods for heart failure include: drug treatment, heart transplantation, ventricular assist device treatment, etc. For patients with severe heart failure, the treatment effect of drug treatment is quite limited, and most need to be treated with heart transplantation and ventricular assist devices. However, the source of heart transplantation is limited. Therefore, ventricular assist devices have become the main choice for patients and doctors. A percutaneous implantable artificial ventricular assist device is a miniaturized blood pumping device that can be introduced into the heart and can be configured to assist or replace the natural heart function by circulating pumping or continuous pumping of blood, providing hemodynamic support for cardiogenic shock and acute heart failure.

[0003] The heart pump includes an impeller, a diffuser, and a motor arranged in sequence; during the assembly process, it is very difficult to ensure the coaxiality of the impeller, diffuser, and motor, resulting in a large rotational eccentricity. At high rotational speeds, the motor is prone to overheating and excessive vibration, damaging blood vessels and blood tissues; during high-frequency operation, the service life is short, making it difficult to meet the clinical use requirements.

[0004] Therefore, based on the problems existing in the prior art, it is necessary to provide a heart pump and an assembly method thereof to improve the performance such as coaxiality and stability of the heart pump including an impeller, a diffuser, and a motor arranged in sequence. Summary of the Invention

[0005] The technical problem solved by the embodiments of the present invention mainly lies in how to improve the coaxiality of the impeller, diffuser, and motor of the heart pump.

[0006] To solve the above technical problem, an improved heart pump is provided in an embodiment of the present invention. The heart pump includes a motor, a diffuser, an impeller, and a pump housing. The motor includes a stator assembly and a rotor assembly. The rotor assembly is rotatably arranged at the center of the stator assembly. It is characterized in that the diffuser includes a diffuser body and a front-end connecting member. The front-end connecting member is coaxially and fixedly connected to the stator assembly. The diffuser body is coaxially connected to the end of the front-end connecting member away from the stator assembly. The front end of the rotating shaft of the rotor assembly passes through the diffuser and is fixedly connected to the impeller. The pump housing is coaxially sleeved outside the diffuser body and the impeller. The pump housing includes a pump housing body and a pump housing frame arranged in sequence. The diffuser body is arranged in the pump housing frame, and the impeller is located inside the pump housing body.

[0007] Preferably, the diffuser body is provided with a centrally penetrating central hole. The diffuser body has a first end and a second end. A bearing hole communicating with the central hole is provided at the center of the end of the second end. A front bearing is provided in the bearing hole. The rotating shaft passes through the front bearing and the central hole to connect the impeller.

[0008] Preferably, an installation groove is provided on the outer periphery of the bearing hole. A connecting flange is provided at the end of the front connecting member connected to the diffuser body. The connecting flange is arranged to match the installation groove. The diffuser body is coaxially installed with the front connecting member through the matching connection between the connecting flange and the installation groove.

[0009] Preferably, the pump housing frame includes a fixing ring and at least two struts. One end of each strut is connected to the pump housing body, and the other end is connected to the fixing ring. A blood pumping port is formed between adjacent struts. The diffuser body is arranged in the pump housing frame through the fixing ring. The diffuser body includes a guide vane hub and at least two guide vanes connected to the guide vane hub. The number of the guide vanes is the same as that of the struts. When the diffuser body is arranged in the pump housing frame, the guide vanes are arranged in one-to-one correspondence with the struts, and the top surface of the guide vane is attached to the inner wall of the strut.

[0010] Preferably, a fixing groove matching the fixing ring is provided on the outside of the diffuser body. When the diffuser body is installed in the pump housing frame, the fixing ring is arranged in the fixing groove.

[0011] Based on the same concept, the present invention also provides an assembly method of the above-mentioned heart pump, including the following steps: a. Provide a stator assembly and a rotor assembly that have been assembled with a front connecting member; rotatably install the rotor assembly in the stator assembly so that the front end of the rotating shaft of the rotor assembly extends out of the front connecting member. b. Provide a front bearing and a diffuser body, and arrange the front bearing in the bearing hole of the diffuser body. c. Sleeve the diffuser body with the front bearing installed on the front end of the rotating shaft, and coaxially and fixedly connect it to the front connecting member. d. Provide an impeller, install the impeller on the front end of the rotating shaft, and keep a set distance from the diffuser body. e. Provide a pump housing, coaxially sleeve the pump housing outside the diffuser body and the impeller, so that the diffuser body is arranged in the pump housing frame, and the impeller is located inside the pump housing body to complete the assembly.

[0012] Preferably, a rear bearing is provided at an end of the stator assembly away from the front end connector. In step a, a sleeve is sleeved on the rotor assembly, glue is coated on the outer wall of the rear end of the rotating shaft, and the rotor assembly is placed into the stator assembly so that the rear end of the rotating shaft is placed in the rear bearing and glued to the rear bearing.

[0013] Preferably, in step b, glue is coated on the outer wall of the front bearing, and the front bearing is placed into the bearing hole and glued to the diffuser body.

[0014] Preferably, the diffuser body is provided with a mounting groove, and a connecting flange is provided at an end of the front end connector connected to the diffuser body. The connecting flange is arranged to match the mounting groove. In step c, the diffuser body with the front bearing mounted is sleeved on the front end of the rotating shaft, the mounting groove is sleeved on the connecting flange, so that the diffuser body and the front end connector are coaxially arranged, and the diffuser body and the front end connector are welded and connected.

[0015] Preferably, a rotating shaft hole is provided at the center of an end of the impeller connected to the rotating shaft. In step e, a feeler gauge is sleeved at the connection between the rotating shaft and the diffuser body, glue is coated on the outer wall of the front end of the rotating shaft, and the front end of the rotating shaft is placed into the rotating shaft hole so that both the impeller and the diffuser body are in contact with the feeler gauge. After adjusting the distance between the impeller and the diffuser body to the thickness of the feeler gauge, the feeler gauge is withdrawn.

[0016] Preferably, the pump housing frame includes a fixing ring and at least two struts, the diffuser body includes at least two guide vanes, and the number of the guide vanes is the same as that of the struts; a fixing groove matching the fixing ring is provided outside the diffuser body. In step d, the pump housing is coaxially sleeved on the outside of the diffuser body so that the fixing ring is embedded into the fixing groove; the positions of the struts are adjusted so that the guide vanes and the struts are arranged in one-to-one correspondence, and the pump housing is pressed to make the top surface of the guide vane fit the inner wall of the strut; the pump housing and the diffuser body are welded and connected at the fixing ring.

[0017] Compared with the prior art, the technical solution of the embodiment of the present invention has beneficial effects.

[0018] For example, for the heart pump and its assembly method provided by the present invention, the diffuser includes a diffuser body and a front-end connecting member. The front-end connecting member is fixedly connected to the coaxial stator assembly, and the diffuser body is coaxially installed at the end with the front-end connecting member as a reference, ensuring the coaxiality between the diffuser body and the motor stator; the rotating shaft of the rotor assembly is coaxially installed with the diffuser body as a reference; the front end of the rotating shaft of the rotor assembly passes through the diffuser and is fixedly connected to the impeller, and the impeller is coaxially installed with the rotating shaft as a reference; thus ensuring the coaxiality of the impeller, rotor assembly and diffuser.

[0019] For another example, a sleeve is sleeved outside the rotor assembly, and then the rotor assembly is placed into the stator assembly. The heat shrinkage property of the sleeve is used to make it closely fit with the rotor assembly to ensure coaxiality; the smooth property of the sleeve makes it easy to place the rotor assembly into the stator assembly. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the heart pump in an embodiment of the present invention; Figure 2 is a schematic structural diagram of the heart pump after removing the pump housing in an embodiment of the present invention; Figure 3 is a schematic structural diagram of the front-end connecting member in an embodiment of the present invention; Figure 4 is a schematic diagram of the connection between the front-end connecting member and the stator assembly in an embodiment of the present invention; Figure 5 is a schematic diagram of the connection between the front-end connecting member and the diffuser body in an embodiment of the present invention; Figure 6 is a schematic diagram of the connection between the diffuser, impeller and pump housing in an embodiment of the present invention; Figure 7 is a sectional view of the connection between the diffuser, impeller and pump housing in an embodiment of the present invention; Figure 8 is a sectional view of the connection between the diffuser and the pump housing in an embodiment of the present invention.

[0021] In the figure: 1 - motor; 11 - stator assembly; 2 - diffuser; 21 - diffuser body; 211 - guide vane hub; 212 - guide vane; 213 - central hole; 214 - bearing hole; 215 - front bearing; 216 - installation groove; 217 - fixing groove; 3 - impeller; 4 - pump housing; 41 - pump housing body; 42 - pump housing frame; 421 - fixing ring; 422 - support pillar. Detailed Embodiments

[0022] To make the objectives, features, and beneficial effects of the present invention more obvious and understandable, the following provides a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. It can be understood that the specific embodiments described below are only used to explain the present invention and are not intended to limit the present invention. Also, in the drawings, the same or similar reference numerals may be used to refer to the same or similar elements in different embodiments, and the descriptions of the same or similar elements in different embodiments as well as the descriptions of elements, features, effects, etc. of the prior art may be omitted.

[0023] Referring to Figures 1 to 7 , an embodiment of the present invention provides a heart pump.

[0024] Specifically, it includes a motor 1, a diffuser 2, an impeller 3, and a pump housing 4. The motor 1 includes a stator assembly 11 and a rotor assembly (not shown). The rotor assembly is rotatably arranged at the center of the stator assembly 11. The diffuser 2 includes a diffuser body 21 and a front-end connecting piece 22. The front-end connecting piece 22 is coaxially and fixedly connected to the stator assembly 11. The diffuser body 21 is coaxially connected to the end of the front-end connecting piece 22 away from the stator assembly 11. The front end of the rotating shaft of the rotor assembly passes through the diffuser 2 and is fixedly connected to the impeller 3. The pump housing 4 is coaxially sleeved outside the diffuser body 21 and the impeller 3. The pump housing 4 includes a pump housing body 41 and a pump housing frame 42 arranged in sequence. The diffuser body 21 is arranged in the pump housing frame 42, and the impeller 3 is located inside the pump housing body 41. The front-end connecting piece 22 is coaxially and fixedly connected to the stator assembly 11. The diffuser body 21 is coaxially installed at the end with the front-end connecting piece 22 as a reference, ensuring the coaxiality between the diffuser body 21 and the stator assembly 11 of the motor 1. The rotating shaft of the rotor assembly is coaxially installed with the diffuser body 21 as a reference. The front end of the rotating shaft of the rotor assembly passes through the diffuser 2 and is fixedly connected to the impeller 3. The impeller 3 is coaxially installed with the rotating shaft as a reference. Thus, the coaxiality of the impeller 3, the rotor assembly, and the diffuser 2 is ensured.

[0025] Specifically, the front end of the rotating shaft of the rotor assembly refers to the end of the rotating shaft close to the front-end connecting piece 22, and the rear end of the rotating shaft refers to the end of the rotating shaft away from the front-end connecting piece 22.

[0026] Specifically, due to the split setting of the diffuser body 21 and the front-end connecting piece 22, the front-end connecting piece 22 can be adapted to diffuser bodies 21 with different structures to adapt to different usage environments.

[0027] In some embodiments, the diffuser body 21 is provided with an axially penetrating central hole 213. The diffuser body 21 has a first end and a second end. A bearing hole 214 communicating with the central hole 213 is provided at the center of the end of the second end. A front-end bearing 215 is arranged in the bearing hole 214. The rotating shaft passes through the front-end bearing 215 and the central hole 213 to connect the impeller 3.

[0028] In some embodiments, an installation groove 216 is provided on the outer periphery of the bearing hole 214, and a connecting flange 221 is provided at the end of the front-end connecting member 22 where it is connected to the diffuser body 21. The connecting flange 221 is arranged to match the installation groove 216, and the diffuser body 21 is coaxially installed with the front-end connecting member 22 through the matching connection between the connecting flange 221 and the installation groove 216.

[0029] In some embodiments, the pump housing frame 42 includes a fixing ring 421 and at least two struts 422. One end of each strut 422 is connected to the pump housing body 41, and the other end is connected to the fixing ring 421. A pump blood outlet is formed between adjacent struts 422. The diffuser body 21 is arranged in the pump housing frame 42 through the fixing ring 421; the diffuser body 41 includes a guide vane hub 211 and at least two guide vanes 212 connected to the guide vane hub 211. The number of guide vanes 212 is the same as the number of struts 422. When the diffuser body 21 is arranged in the pump housing frame 42, the guide vanes 212 and the struts 422 are arranged in one-to-one correspondence, and the top surface of the guide vane 212 is attached to the inner wall of the strut 422.

[0030] In some embodiments, a fixing groove 217 matching the fixing ring 421 is provided on the outside of the diffuser body 21. When the diffuser body 21 is installed in the pump housing frame 42, the fixing ring 421 is arranged in the fixing groove 217.

[0031] Specifically, the fixing groove 217 is provided on the outer periphery of the second end of the diffuser body 21.

[0032] The present invention also provides an assembly method for a heart pump, including the following steps: a. Provide a stator assembly 11 and a rotor assembly that have been assembled with the front-end connecting member 22; rotatably install the rotor assembly in the stator assembly 11 so that the front end of the rotating shaft of the rotor assembly extends out of the front-end connecting member 22; b. Provide a front bearing 215 and a diffuser body 21, and arrange the front bearing 215 in the bearing hole 214 of the diffuser body 21; c. Sleeve the diffuser body 21 with the front bearing 215 installed on the outside of the front end of the rotating shaft and coaxially and fixedly connect it to the front-end connecting member 22; d. Provide an impeller 3, install the impeller 3 at the front end of the rotating shaft, and keep a set distance from the diffuser body 21; e. Provide a pump housing 4, coaxially sleeve the pump housing 4 outside the diffuser body 21 and the impeller 3, so that the diffuser body 21 is arranged in the pump housing frame 42, and the impeller 3 is located inside the pump housing body 41 to complete the assembly.

[0033] In some embodiments, a rear bearing is provided at the end of the stator assembly 11 away from the front end connector 22. In step a, a sleeve is sleeved on the rotor assembly, glue is coated on the outer wall of the rear end of the rotating shaft, and the rotor assembly is placed into the stator assembly 11 so that the rear end of the rotating shaft is placed in the rear bearing and adhesively connected to the rear bearing.

[0034] In some embodiments, in step b, glue is coated on the outer wall of the front bearing 215, and the front bearing 215 is placed into the bearing hole 214 and adhesively connected to the diffuser body 21.

[0035] In some embodiments, the diffuser body 21 is provided with a mounting groove 216, and the end of the front end connector 22 connected to the diffuser body 21 is provided with a connecting flange 221. The connecting flange 221 is arranged to match the mounting groove 216. In step c, the diffuser body 21 with the front bearing 215 installed is sleeved on the front end of the rotating shaft, the mounting groove 216 is sleeved on the outside of the connecting flange 221, so that the diffuser body 21 and the front end connector 22 are coaxially arranged, and the diffuser body 21 and the front end connector 22 are welded and connected.

[0036] In some embodiments, a rotating shaft hole is provided at the center of the end of the impeller 3 connected to the rotating shaft. In step e, a feeler gauge is sleeved at the connection between the rotating shaft and the diffuser body 21, glue is coated on the outer wall of the front end of the rotating shaft, the front end of the rotating shaft is placed into the rotating shaft hole, so that both the impeller 3 and the diffuser body 21 are in contact with the feeler gauge. After adjusting the distance between the impeller 3 and the diffuser body 21 to the thickness of the feeler gauge, the feeler gauge is withdrawn, and the distance between the impeller 3 and the diffuser body 21 is the thickness of the feeler gauge.

[0037] In some embodiments, the pump housing frame 42 includes a fixing ring 421 and at least two struts 422, and the diffuser body 21 includes at least two guide vanes 212. The number of the guide vanes 212 is the same as that of the struts 422; a fixing groove 217 matching the fixing ring 421 is provided outside the diffuser body 21. In step d, the pump housing 4 is coaxially sleeved on the outside of the diffuser body 21, so that the fixing ring 421 is embedded into the fixing groove 217; the positions of the struts 422 are adjusted so that the guide vanes 212 and the struts 322 are arranged in one-to-one correspondence. The pump housing 4 is pressed to make the top surface of the guide vanes 212 fit with the inner wall of the struts 422; the pump housing 4 and the diffuser body 21 are welded and connected at the fixing ring 421.

[0038] In summary, for the heart pump and its assembly method provided by the present invention, the diffuser 2 includes a diffuser body 21 and a front-end connecting member 22. The front-end connecting member 22 is coaxially and fixedly connected to the stator assembly 11. The diffuser body 21 is coaxially installed at the end with the front-end connecting member 22 as a reference, ensuring the coaxiality between the diffuser body 21 and the stator assembly 11 of the motor 1. The rotating shaft of the rotor assembly is coaxially installed with the diffuser body 21 as a reference. The front end of the rotating shaft of the rotor assembly passes through the diffuser 2 and is fixedly connected to the impeller 3. The impeller 3 is coaxially installed with the rotating shaft as a reference, ensuring the coaxiality of the impeller 3, the rotor assembly, and the diffuser 2.

[0039] Further, a sleeve is sleeved on the rotor assembly, and then the rotor assembly is placed into the stator assembly 11. The heat shrinkage property of the sleeve is used to make it closely fit with the rotor assembly to ensure coaxiality. The smooth property of the sleeve makes it easy to place the rotor assembly into the stator assembly 11.

[0040] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when a single embodiment is described only with respect to a specific feature. The feature examples provided in the present disclosure are intended for illustration rather than limitation, unless otherwise stated. In specific implementations, according to actual needs and when technically feasible, the technical features of one or more dependent claims can be combined with the technical features of the independent claim, and the technical features from the corresponding independent claims can be combined in any appropriate manner rather than only through the specific combinations listed in the claims.

[0041] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A heart pump, comprising a motor, a diffuser, an impeller and a pump housing, the motor comprising a stator assembly and a rotor assembly, the rotor assembly being rotatably disposed at the center of the stator assembly, characterized in that, The diffuser includes a diffuser body and a front-end connecting piece. The front-end connecting piece is coaxially and fixedly connected to the stator assembly. The diffuser body is coaxially connected to the end of the front-end connecting piece away from the stator assembly. The front end of the rotating shaft of the rotor assembly passes through the diffuser and is fixedly connected to the impeller. The pump housing is coaxially sleeved outside the diffuser body and the impeller. The pump housing includes a pump housing body and a pump housing frame arranged in sequence. The diffuser body is arranged in the pump housing frame, and the impeller is located inside the pump housing body.

2. The heart pump according to claim 1, characterized in that, The diffuser body is provided with an axially penetrating central hole. The diffuser body has a first end and a second end. A bearing hole communicating with the central hole is provided at the center of the end of the second end. A front-end bearing is arranged in the bearing hole. The rotating shaft passes through the front-end bearing and the central hole to connect the impeller.

3. The heart pump according to claim 2, characterized in that, An installation groove is arranged on the outer periphery of the bearing hole. A connecting flange is arranged at the end of the front-end connecting piece connected to the diffuser body. The connecting flange is arranged to match the installation groove. The diffuser body realizes coaxial installation with the front-end connecting piece through the matching connection between the connecting flange and the installation groove.

4. The heart pump according to claim 1, wherein, The pump housing frame includes a fixing ring and at least two struts. One end of the strut is connected to the pump housing body, and the other end is connected to the fixing ring. A blood pumping port is formed between adjacent struts. The diffuser body is arranged in the pump housing frame through the fixing ring. The diffuser body includes a guide vane hub and at least two guide vanes connected to the guide vane hub. The number of the guide vanes is the same as that of the struts. When the diffuser body is arranged in the pump housing frame, the guide vanes are arranged in one-to-one correspondence with the struts, and the top surface of the guide vane is attached to the inner wall of the strut.

5. The heart pump according to claim 4, wherein, A fixing groove matching the fixing ring is arranged outside the diffuser body. When the diffuser body is installed in the pump housing frame, the fixing ring is arranged in the fixing groove.

6. A method for assembling a heart pump according to any one of claims 1-5, characterized in that, Including the following steps: Provide a stator assembly and a rotor assembly that are assembled with the front-end connecting piece. Rotationally install the rotor assembly in the stator assembly so that the front end of the rotating shaft of the rotor assembly extends out of the front-end connecting piece. Provide a front-end bearing and a diffuser body, and arrange the front-end bearing in the bearing hole of the diffuser body. Set the diffuser body with the front-end bearing installed outside the front end of the rotating shaft and coaxially and fixedly connect it to the front-end connecting piece. Provide an impeller, install the impeller at the front end of the rotating shaft, and keep a set distance from the diffuser body. Provide a pump housing, coaxially sleeve the pump housing outside the diffuser body and the impeller, so that the diffuser body is arranged in the pump housing frame and the impeller is located inside the pump housing body to complete the assembly.

7. The assembling method of the heart pump as claimed in claim 6, wherein a rear bearing is provided at an end of the stator assembly away from the front connecting member. In step a, a sleeve is sleeved outside the rotor assembly, glue is coated on the outer wall of the rear end of the rotating shaft, and the rotor assembly is placed into the stator assembly so that the rear end of the rotating shaft is placed in the rear bearing and glued to the rear bearing.

8. The assembling method of the heart pump according to claim 6, characterized in that, In step b, glue is coated on the outer wall of the front bearing, and the front bearing is placed into the bearing hole and glued to the diffuser body.

9. The assembling method of the heart pump according to claim 6, characterized in that, The diffuser body is provided with a mounting groove, and a connecting flange is provided at an end of the front connecting member connected to the diffuser body. The connecting flange is arranged to match the mounting groove. In step c, the diffuser body with the front bearing mounted is sleeved outside the front end of the rotating shaft, the mounting groove is sleeved outside the connecting flange, so that the diffuser body and the front connecting member are coaxially arranged, and the diffuser body and the front connecting member are welded and connected.

10. The assembling method of the heart pump according to claim 6, characterized in that, A rotating shaft hole is provided at the center of an end of the impeller connected to the rotating shaft. In step e, a feeler gauge is sleeved at the connection between the rotating shaft and the diffuser body, glue is coated on the outer wall of the front end of the rotating shaft, and the front end of the rotating shaft is placed into the rotating shaft hole, so that the impeller and the diffuser body are both in contact with the feeler gauge. After adjusting the distance between the impeller and the diffuser body to the thickness of the feeler gauge, the feeler gauge is withdrawn.

11. The assembling method of the heart pump according to claim 6, characterized in that, The pump housing frame includes a fixing ring and at least two struts, and the diffuser body includes at least two guide vanes, and the number of the guide vanes is the same as the number of the struts; a fixing groove matching the fixing ring is provided outside the diffuser body. In step d, the pump housing is coaxially sleeved outside the diffuser body, so that the fixing ring is embedded into the fixing groove; the positions of the struts are adjusted so that the guide vanes and the struts are arranged in one-to-one correspondence, and the pump housing is pressed to make the top surface of the guide vane fit the inner wall of the strut; the pump housing and the diffuser body are welded and connected at the fixing ring.

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