Blood pump assembly jig and assembly method

Abstract

The present invention relates to the technical field of assembly jigs for medical devices, and in particular to a blood pump assembly jig and an assembly method, wherein the blood pump assembly jig comprises a moving mechanism and a pump body clamping assembly and / or an impeller clamping assembly arranged on the moving mechanism; the pump body clamping assembly is used to clamp and fix the pump body, the impeller clamping assembly is used to clamp and fix the impeller assembly, and the moving mechanism drives the pump body clamping assembly and the impeller clamping assembly to be relatively close to or relatively far away from each other; the blood pump assembly jig provided by the present invention clamps and fixes the pump body by the pump body clamping assembly, and clamps and fixes the impeller assembly by the impeller clamping assembly, and then uses the moving mechanism to drive the pump body clamping assembly and the impeller clamping assembly to be relatively close to or relatively far away from each other, thereby effectively avoiding the defect that the product quality cannot meet the use requirements due to poor coaxiality during manual assembly, and ensuring the consistency of the quality of the assembled products.

Description

Technical Field

[0001] The present invention relates to the technical field of medical device assembly jigs, and in particular to a blood pump assembly jig and an assembly method. Background Art

[0002] An invasive micro blood pump can be implanted into a patient's body to temporarily or long-term maintain human blood circulation. It is mainly used for transplantation replacement therapy for patients with end-stage heart failure.

[0003] like Figure 2 The figure shows an interventional micro blood pump currently in common use, which includes a pump body 1 and a motor rotor 3; one end of the motor rotor 3 is provided with an impeller 2 arranged coaxially, and a sliding bearing 4 is sleeved on the shaft between the impeller 2 and the motor rotor 3, and the outer ring of the sliding bearing 4 cooperates with the pump body 1 to realize the rotation support of the motor rotor 3.

[0004] In the prior art, the operations of assembling the sliding bearing 4 to the motor rotor 3 and the operations of assembling the motor rotor 3 together with the sliding bearing 4 into the pump body 1 are all performed manually. The diameter of the pump body 1 does not exceed 7 mm. Due to the extremely small space for product assembly, the coaxiality of the shaft hole is very poor when fitting, or the glue of the motor rotor 3 touches the ball during the fitting process with the sliding bearing 4 due to hand shaking. The above situation will cause the motor rotor 3 to produce radial vibration at 40,000 rpm due to poor dynamic balancing performance, which can easily cause the ball to be damaged and stuck, or the ball to slide due to the curing of the glue, and the friction heat generation temperature will rise sharply and burn the shaft. In addition, from the perspective of temperature balance, it will cause the temperature of the entire system to rise, especially for interventional medical devices.

[0005] Currently, there are fixtures on the market that are made using the core-pulling principle of a mold slider, but the fixtures require a large assembly space and are not suitable for the invasive micro blood pump rotor of the present invention, which has a small assembly space.

[0006] Based on the above-mentioned existing situation, developing an assembly jig suitable for the rotor of an interventional micro blood pump to ensure the coaxiality of the shaft hole and prevent the glue from touching the ball, thereby ensuring the overall life and high performance of the interventional micro blood pump has become a technical problem that needs to be urgently solved by people in this field. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art in which the motor rotor, impeller and sliding bearing are assembled into the pump body manually, and to provide a blood pump assembly jig to ensure product quality and consistency.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] In one aspect, the present invention provides a blood pump assembly jig, comprising a moving mechanism and a pump body clamping assembly and / or an impeller clamping assembly arranged on the moving mechanism;

[0010] The pump body clamping assembly is used to clamp and fix the pump body, the impeller clamping assembly is used to clamp and fix the impeller assembly, and the moving mechanism drives the pump body clamping assembly and the impeller clamping assembly to be relatively close to or relatively far away from each other.

[0011] A second aspect of the present invention provides a method for assembling a blood pump, the method comprising the following steps:

[0012] Use the pump body clamping assembly to fix the pump body.

[0013] Impeller assembly: The impeller assembly includes an impeller, a sliding bearing and a motor rotor with a rotating shaft; first, the sliding bearing is sleeved on the outer wall of the rotating shaft near the impeller side, and then the rotating shaft is inserted into the inner cavity of the impeller to complete the assembly of the impeller assembly;

[0014] After the impeller assembly is assembled, put the impeller part into the impeller clamping assembly and clamp it firmly;

[0015] Move the pushing assembly along the radial direction of the motor rotor to the end of the sliding bearing away from the pump body clamping assembly, and then push the sliding bearing to the end close to the motor rotor through the pushing assembly to fix the sliding bearing;

[0016] Then the impeller clamping assembly is moved as a whole toward one side of the pump body clamping assembly to insert the motor rotor into the pump body. After the motor rotor is fully inserted, the impeller clamping assembly is continued to be moved to push the sliding bearing into the pump body. Then the pushing assembly is removed along the radial direction of the motor rotor, and the impeller clamping assembly is slowly pushed to continue inserting the shaft of the motor rotor into the pump body until the end of the impeller is close to the end of the pump body.

[0017] Open the pump body clamping assembly and the impeller clamping assembly separately, and take out the assembled blood pump.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] The blood pump assembly jig provided by the present invention clamps and fixes the pump body through a pump body clamping assembly, and clamps and fixes the impeller assembly through an impeller clamping assembly, and then utilizes a moving mechanism to drive the pump body clamping assembly and the impeller clamping assembly to be relatively close to or relatively far away from each other, thereby effectively avoiding the defect that the product quality cannot meet the use requirements due to poor coaxiality during manual assembly, and ensuring the consistency of the quality of the assembled products.

[0020] The method for assembling a blood pump using the blood pump assembly jig provided by the present invention ensures the coaxiality of the central axis hole of the blood pump product, while effectively avoiding the glue from touching the ball, thereby ensuring the overall life and high performance of the interventional micro blood pump.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It shows a schematic structural diagram of a blood pump assembly jig provided according to a specific embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the invasive micro blood pump in the present invention;

[0024] Figure 3 A cross-sectional view of an impeller lower die fixture provided according to a specific embodiment of the present invention is shown;

[0025] Explanation of the numbers in the figure: 1. Pump body; 2. Impeller; 3. Motor rotor; 4. Sliding bearing; 10. Pump body clamping assembly; 11. Pump body lower mold clamp; 12. Pump body upper mold clamp; 13. Second slider; 20. Impeller clamping assembly; 21. Impeller lower mold clamp; 211. Limit step; 22. Impeller upper mold clamp; 23. First slider; 24. Guide limit hole; 30. Guide rail; 31. Baffle; 401. Semicircular recess; 41. Left slide plate; 42. Right slide plate. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific drawings.

[0027] It should be noted that, in the present invention, when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] As mentioned above, the present invention provides a blood pump assembly jig, including a moving mechanism and a pump body clamping assembly 10 and / or an impeller clamping assembly 20 arranged on the moving mechanism;

[0030] The pump body clamping assembly 10 is used to clamp and fix the pump body 1, and the impeller clamping assembly 20 is used to clamp and fix the impeller assembly. The moving mechanism drives the pump body clamping assembly 10 and the impeller clamping assembly 20 to be relatively close to or relatively far away from each other.

[0031] In the present invention, only the pump body clamping assembly 10 is arranged on the moving mechanism, and the moving mechanism drives the pump body clamping assembly 10 to approach or move away from the impeller clamping assembly 20; or only the impeller clamping assembly 20 is arranged on the moving mechanism, and the moving mechanism drives the impeller clamping assembly 20 to approach or move away from the pump body clamping assembly 10; or the pump body clamping assembly 10 and the impeller clamping assembly 20 are arranged on the moving mechanism, and the moving mechanism drives the two to move relatively close to or relatively away from each other.

[0032] Based on the technical solution provided by the present invention, the pump body is clamped and fixed by the pump body clamping assembly, and the impeller assembly is clamped and fixed by the impeller clamping assembly, and then the pump body clamping assembly and the impeller clamping assembly are driven relatively close to or relatively far away by a moving mechanism, thereby effectively avoiding the defect that the product quality cannot meet the use requirements due to poor coaxiality during manual assembly, and ensuring the consistency of the quality of the assembled products.

[0033] Further, according to the assembly jig provided by the present invention, as a specific embodiment of the pump body clamping assembly 10 and the impeller clamping assembly 20, combined with Figure 1 As shown, the pump body clamping assembly 10 comprises a pump body lower mold fixture 11 and a pump body upper mold fixture 12, and a mold cavity arranged opposite to each other is provided between the pump body lower mold fixture 11 and the pump body upper mold fixture 12, and the pump body 1 is clamped and fixed after the two molds are closed;

[0034] The impeller clamping assembly 20 includes an impeller lower mold fixture 21 and an impeller upper mold fixture 22. A mold cavity arranged opposite to each other is provided between the impeller lower mold fixture 21 and the impeller upper mold fixture 22, and the impeller assembly is clamped and fixed after the two molds are closed.

[0035] In the present invention, the impeller assembly comprises an impeller, a sliding bearing and a motor rotor with a rotating shaft.

[0036] Furthermore, in the present invention, the motor rotor is a permanent magnet formed by magnetizing an iron alloy. In the process of the motor rotor approaching the pump body 1, an axial force toward the pump body 1 is generated on the impeller assembly under the action of the magnetic force. In order to avoid the axial force affecting the assembly of the impeller assembly, a limiting step 211 is provided in the mold cavity of the impeller lower mold clamp 21 and / or the impeller upper mold clamp 22 for limiting the axial movement of the impeller assembly.

[0037] Combination Figure 3As shown, a limiting step 211 is provided in the mold cavity of the impeller lower mold fixture 21 for cooperating with the impeller 2 of the impeller assembly to limit its axial movement.

[0038] Furthermore, in the present invention, the function of the moving mechanism is to drive the pump body clamping assembly 10 and the impeller clamping assembly 20 to move relatively close to or relatively far away from each other. As a specific embodiment of the moving mechanism, the moving mechanism includes a guide rail 30, which is arranged beside the pump body clamping assembly 10, and the length direction of the guide rail 30 is consistent with the length direction of the shaft core of the pump body 1;

[0039] The impeller clamping assembly 20 is slidably arranged on the guide rail 30 via the first slider 23 , and moves along a direction defined by the guide rail 30 .

[0040] Furthermore, the pump body clamping assembly 10 is slidably arranged on the guide rail 30 via the second slider 13 , and moves along the direction defined by the guide rail 30 .

[0041] Furthermore, in the present invention, a baffle 31 fixed on the guide rail 30 is provided on the side of the pump body clamping assembly 10 away from the impeller clamping assembly 20, and the baffle 31 forms a blocking fit with the pump body clamping assembly 10. That is, in specific use, the pump body clamping assembly 10 cooperates with the baffle 31 and is relatively fixed on the guide rail 30, and the impeller clamping assembly 20 approaches or moves away from the pump body clamping assembly 10 along the direction defined by the guide rail 30.

[0042] According to the present invention, the blood pump assembly jig also includes a pushing component, which is movably arranged on the side of the impeller clamping component 20 adjacent to the pump body clamping component 10. The pushing component can move radially along the motor rotor 3 to the end of the sliding bearing 4 away from the pump body clamping component 10, and push the sliding bearing 4 to the end close to the motor rotor 3, and after the motor rotor 3 is inserted into the pump body 1, push the sliding bearing 4 into the pump body 1.

[0043] Furthermore, the pushing assembly includes a left slide plate 41 and a right slide plate 42, and the adjacent ends of the left slide plate 41 and the right slide plate 42 are both provided with a semicircular notch 401, and when the left slide plate 41 and the right slide plate 42 are close to each other, they enclose to form a full circle and clamp on the shaft of the motor rotor 3;

[0044] The impeller clamping assembly 20 is provided with symmetrically arranged guide limit holes 24 for the left slide plate 41 and the right slide plate 42 to be inserted therein respectively. The left slide plate 41 and the right slide plate 42 can move along the direction defined by the guide limit holes 24 and push the sliding bearing 4 close to the motor rotor 3.

[0045] The impeller clamping assembly 20 includes an impeller lower mold fixture 21 and an impeller upper mold fixture 22. A mold cavity arranged opposite to each other is provided between the impeller lower mold fixture 21 and the impeller upper mold fixture 22, and the impeller 2 is clamped and fixed after the two molds are closed.

[0046] The impeller lower mold fixture 21 and the impeller upper mold fixture 22 are respectively provided with limiting grooves on one side adjacent to the pump body clamping assembly 10, and the guide limiting hole 24 is enclosed after the two are molded together.

[0047] Positioning posts and positioning holes are respectively provided on adjacent surfaces of the left slide plate 41 and the right slide plate 42 to form a guide and limit fit.

[0048] The present invention also provides a method for assembling a blood pump based on the blood pump assembly jig, the method comprising the following steps:

[0049] Use the pump body clamping assembly 10 to clamp and fix the pump body 1;

[0050] Impeller assembly: The impeller assembly includes an impeller 2, a sliding bearing 4 and a motor rotor 3 with a rotating shaft; firstly, the sliding bearing 4 is sleeved on the outer wall of the rotating shaft near the side of the impeller 2, and then the rotating shaft is inserted into the inner cavity of the impeller 2 to complete the assembly of the impeller assembly;

[0051] After the impeller assembly is assembled, the impeller assembly is partially placed into the impeller clamping assembly 20 and clamped and fixed;

[0052] Move the pushing assembly along the radial direction of the motor rotor 3 to the end of the sliding bearing 4 away from the pump body clamping assembly 10, and then push the sliding bearing 4 to the end close to the motor rotor 3 through the pushing assembly to fix the sliding bearing 4;

[0053] Then the impeller clamping assembly 20 is moved as a whole toward the side of the pump body clamping assembly 10, so that the motor rotor 3 is inserted into the pump body 1. After the motor rotor 3 is fully inserted, the impeller clamping assembly 20 is continued to be moved to push the sliding bearing 4 into the pump body 1. Then the pushing assembly is removed along the radial direction of the motor rotor 3, and the impeller clamping assembly 20 is slowly pushed again to make the shaft of the motor rotor 3 continue to be inserted into the pump body 1 until the end of the impeller 2 is close to the end of the pump body 1;

[0054] Open the pump body clamping assembly 10 and the impeller clamping assembly 20 respectively, and take out the assembled blood pump.

[0055] The above shows and describes the basic principles, main features and characteristics of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A blood pump assembly jig, characterized in that: It comprises a moving mechanism and a pump body clamping assembly and / or an impeller clamping assembly arranged on the moving mechanism; The pump body clamping assembly is used to clamp and fix the pump body, the impeller clamping assembly is used to clamp and fix the impeller assembly, and the moving mechanism drives the pump body clamping assembly and the impeller clamping assembly to be relatively close to or relatively far away from each other; The moving mechanism comprises: A guide rail, which is arranged beside the pump body clamping assembly, and the length direction of the guide rail is consistent with the length direction of the shaft core of the pump body; The impeller clamping assembly is slidably arranged on the guide rail through a first slider and moves along a direction defined by the guide rail; The pump body clamping assembly is slidably arranged on the guide rail through a second slider and moves along the direction defined by the guide rail; Preferably, a baffle plate fixed on the guide rail is provided on the side of the pump body clamping assembly away from the impeller clamping assembly, and the baffle plate and the pump body clamping assembly form a blocking fit; It also includes a pushing assembly, which is movably arranged on a side of the impeller clamping assembly adjacent to the pump body clamping assembly, and can move along the radial direction of the motor rotor to an end of the sliding bearing away from the pump body clamping assembly, and push the sliding bearing to an end close to the motor rotor, and after the motor rotor is inserted into the pump body, push the sliding bearing into the pump body; The pushing assembly comprises a left slide plate and a right slide plate, and the adjacent ends of the left slide plate and the right slide plate are both provided with a semicircular notch portion, and when the left slide plate and the right slide plate are close to each other, they enclose to form a full circle and clamp on the shaft of the motor rotor; The impeller clamping assembly is provided with symmetrically arranged guide limiting holes for the left slide plate and the right slide plate to be inserted therein, respectively. The left slide plate and the right slide plate can move along the direction defined by the guide limiting holes and push the sliding bearing close to the motor rotor; The impeller clamping assembly comprises an impeller lower mold fixture and an impeller upper mold fixture, wherein a mold cavity arranged opposite to each other is provided between the impeller lower mold fixture and the impeller upper mold fixture, and the impeller is clamped and fixed after the two molds are closed; The impeller lower mold fixture and the impeller upper mold fixture are respectively provided with limiting grooves on one side adjacent to the pump body clamping assembly, and the two are enclosed to form the guide limiting hole after the two are molded together; Positioning posts are also provided on adjacent surfaces of the left slide plate and the right slide plate respectively, and the positioning posts and the positioning holes form a guide and limit fit.

2. The blood pump assembly jig according to claim 1, characterized in that: The pump body clamping assembly comprises a pump body lower mold clamp and a pump body upper mold clamp, a mold cavity arranged opposite to each other is provided between the pump body lower mold clamp and the pump body upper mold clamp, and the pump body is clamped and fixed after the two molds are closed; The impeller clamping assembly comprises an impeller lower mold fixture and an impeller upper mold fixture, and a mold cavity arranged oppositely is provided between the impeller lower mold fixture and the impeller upper mold fixture, and the impeller assembly is clamped and fixed after the two molds are closed.

3. The blood pump assembly jig according to claim 2, characterized in that: A limiting step is provided in the mold cavity of the impeller lower mold fixture and / or the impeller upper mold fixture for limiting the axial movement of the impeller assembly.

4. The method for assembling a blood pump using a blood pump assembly jig according to claim 3, characterized in that: The method comprises the following steps: Use the pump body clamping assembly to fix the pump body; Impeller assembly: The impeller assembly includes an impeller, a sliding bearing and a motor rotor with a rotating shaft; first, the sliding bearing is sleeved on the outer wall of the rotating shaft near the impeller side, and then the rotating shaft is inserted into the inner cavity of the impeller to complete the assembly of the impeller assembly; After the impeller assembly is assembled, put the impeller part into the impeller clamping assembly and clamp it firmly; Move the pushing assembly along the radial direction of the motor rotor to the end of the sliding bearing away from the pump body clamping assembly, and then push the sliding bearing to the end close to the motor rotor through the pushing assembly to fix the sliding bearing; Then the impeller clamping assembly is moved as a whole toward one side of the pump body clamping assembly to insert the motor rotor into the pump body. After the motor rotor is fully inserted, the impeller clamping assembly is continued to be moved to push the sliding bearing into the pump body. Then the pushing assembly is removed along the radial direction of the motor rotor, and the impeller clamping assembly is slowly pushed to continue inserting the shaft of the motor rotor into the pump body until the end of the impeller is close to the end of the pump body. Open the pump body clamping assembly and the impeller clamping assembly separately, and take out the assembled blood pump.

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