CN215870935U - Integrally encapsulated low-temperature-rise implantable micro motor - Google Patents

Abstract

The utility model discloses an integrally encapsulated low-temperature-rise implantable micro motor which comprises a stator component, a rotor component, a sliding bearing and a rolling bearing, wherein the stator component comprises a laminated stator, an armature winding, a right cover, a plurality of leads, an encapsulating colloid and a tail cover; the rotor assembly comprises a shaft core, a permanent magnet and a shaft sleeve; the opening at the right end of the tail cover is used as a fluid inlet, the pore space on the rolling bearing is used as a fluid channel I, the space between the stator assembly and the rotor assembly and between the sliding bearing and the rolling bearing is used as a fluid channel II, and the gap between the sliding bearing and the shaft core is used as a fluid outlet, so that a fluid flow path with the fluid pressure and the fluid flow within a set range is formed. The utility model can obviously improve the fluid pressure level in the motor, avoid the blood of human body from flowing into the motor with higher temperature to generate blood coagulation so as to block the fluid circulation channel and influence the normal rotation of the rotor assembly, and the internal fluid circulation can take away part of heat, thereby being beneficial to reducing the temperature of the armature winding.

Description

Integrally encapsulated low-temperature-rise implantable micro motor

Technical Field

The utility model belongs to the field of motors, and particularly relates to an integrally encapsulated low-temperature-rise implantable micro motor.

Background

Cardiovascular disease is the first killer of health problems worldwide, according to world health organization statistics. When people have diseases or need to perform operations due to other factors, the heart pump blood function is insufficient, particularly in some operation situations, the operation time is long, the risk is high, particularly for patients with poor heart function or heart failure, the situation that the pump blood function of the heart of the patient is insufficient needs to be improved in the operation process or the recovery period after the operation, and an artificial auxiliary blood pump is usually arranged in the blood circulation system of the patient. Because the heart failure degree or the thrombus blockage condition of patients suffering from cardiovascular diseases are different, the blood pumping capacity of an artificial auxiliary blood pump is required to be as strong as possible so as to meet the harsh use environment of conditions such as serious heart failure or blood vessel blockage and the like. In order to solve such problems, it is necessary to provide a highly reliable and powerful miniature power unit.

The prior art scheme usually uses brushless motor as power source to combine pump class device to realize, solved the misery of vast patient, played good medical treatment effect, nevertheless appear catching a bit to higher and higher medical requirement, consequently need optimize the promotion to current miniature motor-driven scheme, the not enough main performance of current scheme is: 1. the motor structural strength design can not maintain the state of ultrahigh internal fluid pressure, and the risk that blood gushes into the motor exists on occasions with higher external blood pressure. 2. The motor has insufficient performance and low efficiency, and in order to prevent the motor from over-temperature rise, the use power can be reduced as far as possible, so that the blood drawing capability of the blood pumping device is insufficient, and the application under higher use conditions is not facilitated; 3. The key materials and the process of the motor do not reach the optimal state, and the further improvement of the performance is also limited; 4. In order to improve the reliability of motor encapsulation, the thickness of the encapsulation layer is still thicker, and the performance improvement of the motor is limited.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects or improvement requirements in the prior art, the utility model provides the integrally encapsulated low-temperature-rise implantable micro motor, which has the advantages of high reliability, low temperature rise, long service life, wide application range and the like by setting the structure and the process design, reasonably selecting materials and increasing the maximum utilization of material characteristics.

In order to achieve the above object, according to the present invention, there is provided an integrally encapsulated low temperature rise implantable micro motor, which is characterized by comprising a stator assembly, a rotor assembly, a sliding bearing and a rolling bearing, wherein:

the stator assembly comprises a laminated stator, an armature winding, a right cover, potting adhesive, a tail cover and a plurality of lead wires, the laminated stator surrounds the armature winding, an insulating layer is filled in a gap between the laminated stator and the armature winding, the left end of the right cover props against the right end of the laminated stator, one end of each lead wire is welded with a terminal connecting wire of the armature winding, the other end of each lead wire penetrates through the right cover and is exposed out of the right cover, a limiting boss is arranged on the inner wall of the right cover, an accommodating space is formed between the left end of the limiting boss and the right end of the armature winding, and a welding point of the lead wire and the terminal connecting wire of the armature winding is located in the accommodating space; the pouring sealant covers the outer side of the right cover, the outer side and the left end of the laminated stator, the left end and the inner side of the armature winding and the inner side of the limiting boss, and fills the accommodating space; the sliding bearing is installed on the inner wall of the potting colloid, the rolling bearing is sleeved on the inner wall of the right cover, and the outer ring of the sliding bearing is pressed on the right end face of the limiting boss by the tail cover;

the rotor assembly comprises a shaft core, a permanent magnet and a shaft sleeve, the left end and the right end of the shaft core respectively penetrate through the sliding bearing and the rolling bearing, the permanent magnet is fixedly arranged on the shaft core in a penetrating mode, the two ends of the shaft core both exceed the two ends of the permanent magnet, the shaft sleeve is fixedly arranged on the shaft core in a penetrating mode, the left end of the shaft sleeve is abutted to the right end of the permanent magnet, and the right end of the shaft sleeve is abutted to the inner ring of the rolling bearing;

an opening at the right end of the tail cover is used as a fluid inlet, a pore on the rolling bearing is used as a fluid channel I, a space between the sliding bearing and the rolling bearing between the stator assembly and the rotor assembly is used as a fluid channel II, a gap between the sliding bearing and the shaft core is used as a fluid outlet, and the fluid inlet, the fluid channel I, the fluid channel II and the fluid outlet form a fluid flow passage together.

Preferably, the laminated stator is integrally in a hollow cylindrical shape, the laminated stator is integrally glued by a plurality of laminated sheets so as to realize the lossless assembly of the laminated stator and ensure the integrity of the microstructure of the laminated stator, the axial thickness of each laminated sheet is not more than 0.1mm, the radial thickness of each laminated sheet is 0.2-0.5 mm, and each laminated sheet is made of iron silicon or iron nickel alloy.

Preferably, the armature winding is integrally in a hollow cylindrical shape and adopts a pure silver enameled wire or a pure copper enameled wire;

the lead has sinle silk and the insulating skin of cladding on silver system sinle silk, the sinle silk is silver system sinle silk or copper sinle silk.

Preferably, the outer side of the permanent magnet is provided with a biological coating, a gap exists between the biological coating and the pouring sealant, and the biological coating comprises a priming layer and a surface layer which are sequentially arranged from inside to outside.

Preferably, the radial thickness of the biological coating is 0.01-0.04 mm, the thickness of the priming layer is 0.003-0.015 mm, and the thickness of the surface layer is 0.01-0.03 mm.

Preferably, the permanent magnet has a one-pair magnetic pole or two-pair magnetic pole configuration.

Preferably, the shaft core is provided with a hardened coating for the mating portion with the sliding bearing.

Preferably, the shaft sleeve is a stepped shaft, the large end of the shaft sleeve is arranged at the left side, the small end of the shaft sleeve is arranged at the right side, the left side face of the large end completely covers the right end face of the permanent magnet, and the small end is used for guiding fluid flowing out of the pore of the rolling bearing to the outer side of the large end through the right side of the large end, so that the fluid directly acts on the right side plane of the large end of the shaft sleeve, and the reliability of end sealing of the rotor assembly is improved.

Preferably, the sliding bearing, the potting colloid and the shaft core are all made of biocompatible materials, the shaft sleeve is made of biocompatible metal materials, the rolling bearing is of a ball bearing structure and is free of a dustproof cover so as to allow fluid to smoothly circulate, the materials used by the rolling bearing meet the biocompatibility requirement, the inner ring and the outer ring of the rolling bearing are made of wear-resistant medical stainless steel, the balls are made of ceramic materials, the retainer is made of medical peek materials or stainless steel, and the right cover and the tail cover are made of medical peek materials.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

1) according to the utility model, by adopting a structure of circulating fluid in the bearing and a pouring sealant wrapping design, the fluid enters the motor through the pores of the rolling bearing, and the fluid in the motor can flow into the gap between the inner wall of the sliding bearing and the micro-gap between the inner wall of the sliding bearing and the shaft core through the pore channels of the rolling bearing. Because the design of the encapsulation colloid wrapping the periphery of the motor, the pressure level of the fluid in the motor can be obviously improved, and the phenomenon that the blood of a human body floods into the motor with higher temperature to cause coagulation is avoided, so that a fluid circulation channel is blocked and the normal rotation of a motor rotor is influenced is avoided. In addition, the fluid circulation in the motor can take away part of heat, which is beneficial to reducing the temperature of the armature winding.

2) The laminated stator adopted by the miniature blood pump motor has small radial thickness and the thickness of a single laminated sheet is not more than 0.1mm, and the laminated stator is formed into a whole on the premise of not damaging the microstructure of the laminated stator, so that the integrity of the microstructure of the laminated stator is ensured to the maximum extent, the maximum utilization of material performance is realized, the temperature rise of the motor is reduced, and the occurrence risk of coagulation is reduced.

3) The coil winding of the micro blood pump motor adopts a low-resistivity material, so that the resistance drop is reduced to the maximum extent, the motor efficiency is improved, and the temperature rise is smaller.

4) The lead of the micro blood pump motor adopts a low-resistivity material, and meanwhile, the periphery of the wire core is wrapped by a thin insulating skin, so that the cross section area of the wire core is maximized in a limited space, the resistance drop of the lead is effectively reduced, the working efficiency of the motor is further improved, and the working temperature rise of the motor is favorably reduced.

5) The implantable micro motor has a small diameter, the length-diameter ratio can reach 3-5 times, the implantable micro motor is a slender structure, the motor is subjected to full-wrapping encapsulation by a series of encapsulation processes, such as laminating a stator and an armature winding, and the like, the front end of the encapsulation adhesive is integrally cast with the sliding bearing, and the rear end of the encapsulation adhesive wraps a part of the right cover.

6) The implantable micro motor is realized by carrying out biocompatible coating treatment on the surface of the permanent magnet and selecting a special coating process with high adhesive force, so that the sealing protection of the permanent magnet is realized.

7) The sliding bearing is fixed in the bearing chamber by adopting a plurality of micro pins, and the rolling bearing is axially pressed and connected through an external structure, so that the reliability and the safety of the assembly of the rotor component under the impact of abnormal load are greatly improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is an enlarged schematic view at A in the present invention;

fig. 3 is a schematic view of the structure of the sliding bearing in the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to fig. 3, an integrally encapsulated low temperature rise implantable micro motor includes a stator assembly 1, a rotor assembly 2, a sliding bearing 3 and a rolling bearing 4, wherein:

the stator assembly 1 comprises a laminated stator 12, an armature winding 13, a right cover 15, a pouring sealant 11 and a tail cover 16, wherein a plurality of lead wires 14 are arranged, the laminated stator 12 surrounds the armature winding 13, a gap between the laminated stator 12 and the armature winding 13 is filled with an insulating layer, the left end of the right cover 15 props against the right end of the laminated stator 12, one end of each lead wire 14 is welded with a terminal connecting wire 131 of the armature winding 13, the other end of each lead wire passes through the right cover 15 and is exposed out of the right cover 15, and a welding point 132 is formed at the welding position; the side wall of the right cover 15 is provided with a notch (not shown) for facilitating the lead 14 to pass through the right cover 15. The inner wall of the right cover 15 is provided with a limit boss 17, an accommodating space 18 is formed between the left end of the limit boss 17 and the right end of the armature winding 13, and a welding point 132 of the lead 14 and an end connecting wire 131 of the armature winding 13 is positioned in the accommodating space 18; the potting adhesive 11 covers the outer side of the right cover 15, the outer side and the left end of the laminated stator 12, the left end and the inner side of the armature winding 13 and the inner side of the limit boss 17, and the potting adhesive 11 fills the accommodating space 18; the sliding bearing 3 is installed on the inner wall of the potting colloid 11, the rolling bearing 4 is sleeved on the inner wall of the right cover 15, and the tail cover 16 presses the outer ring of the sliding bearing 3 on the right end face of the limiting boss 17; the potting adhesive 11 uniformly wraps the outer side of the laminated stator 12 and the inner side of the armature winding 13. The end part of the potting colloid 11 wraps the end parts of the laminated stator 12 and the armature winding 13. And the right end of the potting colloid 11 is fixedly poured with the sliding bearing 3. The potting colloid 11 encapsulates a part of the right cover 15 into a whole to prevent the right cover 15 from loosening. The rolling bearing 4 is installed in a bearing chamber arranged in the right cover 15, and the bottom of the bearing chamber of the right cover 15 is provided with the limiting boss 17.

The rotor assembly 2 comprises a shaft core 21, a permanent magnet 22 and a shaft sleeve 24, the left end and the right end of the shaft core 21 penetrate through the sliding bearing 3 and the rolling bearing 4 respectively, the permanent magnet 22 is fixedly arranged on the shaft core 21 in a penetrating mode, the two ends of the shaft core 21 exceed the two ends of the permanent magnet 22, the shaft sleeve 24 is fixedly arranged on the shaft core 21 in a penetrating mode, the left end of the shaft sleeve 24 is abutted to the right end of the permanent magnet 22, and the right end of the shaft sleeve 24 is abutted to the inner ring of the rolling bearing 4. The shaft core 21 is in clearance fit with the sliding bearing 3, and the surface of the part of the shaft core 21 for matching with the sliding bearing 4 is added with a hardening coating so as to reduce the generation of wear particles. The permanent magnet 22 is coaxially matched with the shaft core 21, and the permanent magnet 22 is provided with a pair of magnetic poles or two pairs of magnetic poles and is made of a high-performance permanent magnet material so as to meet the higher performance requirement of the motor. The left end of the shaft core 21 penetrates through the inner hole of the sliding bearing 3 and extends out of the sliding bearing 3, and the extending end of the shaft core 21 is used for installing a load part. The right end of the shaft core 21 is in interference fit with the inner hole of the rolling bearing 4 so as to achieve proper connection strength and limit the rotor assembly 2 to axially slide towards the front end. The rotor assembly 2 is free to rotate at high speed supported by the plain bearing 3 and rolling bearing 4.

The opening at the right end of the tail cover 16 is used as a fluid inlet, the pore on the rolling bearing 4 is used as a fluid channel I, the space between the sliding bearing 3 and the rolling bearing 4 between the stator assembly 1 and the rotor assembly 2 is used as a fluid channel II, the gap between the sliding bearing 3 and the shaft core 21 is used as a fluid outlet, the fluid inlet, the fluid channel I, the fluid channel II and the fluid outlet form a fluid flow passage together, the fluid intermediate channel I, the fluid intermediate channel II and the fluid outflow channel are used as internal flow passages of the micro motor, the liquid pressure reaches 220 mmHg-960 mmHg (greater than the blood pressure of a human body), and the flow at the outlet of the fluid outflow channel is smaller than 7mL/min, so that the risk that the blood of the human body flows into the interior of the micro motor is effectively prevented.

After the laminated stator 12 and the armature winding 13 are assembled into a whole, the laminated stator 12, the armature winding 13, the right cover, the sliding bearing 3 and the lead 14 are encapsulated into a whole, wherein only a small section of thread end of the lead 14 is partially embedded in the encapsulating colloid 11, and the laminated stator 12, the armature winding 13, the right cover 15 and the sliding bearing 3 are encapsulated by coaxial installation, so that the purpose of sealing materials without biocompatibility is finally achieved, and the sliding bearing 3 and the right cover 15 are firmly fixed. A gap exists between the potting colloid 11 and the rotor assembly 2.

Further, the laminated stator 12 is integrally in a hollow cylindrical shape, the laminated stator 12 is integrally adhered by a plurality of laminated sheets, so that the nondestructive assembly of the laminated stator 12 is realized, and the integrity of the microstructure of the laminated stator 12 is guaranteed, while the existing stator assembly is mostly assembled in a self-buckling mode or a welding mode, and the microstructure of the material is greatly damaged. The axial thickness of the single lamination is not more than 0.1mm and the radial thickness is 0.2 mm-0.5 mm, preferably iron silicon and iron nickel alloy, and the single lamination is manufactured into the laminated stator 12 with the required thickness through a gluing process. The laminating process is different from the traditional self-buckling and laser welding processes, can retain the microstructure of the material to the maximum extent, and avoids the reduction of electromagnetic property caused by the change of material property, so that the iron loss and the heating of the motor are reduced.

Further, the armature winding 13 is manufactured through a series of processes, and has the characteristic of high neatness of winding displacement, the armature winding 13 is integrally in a hollow cylindrical shape, the outer side of the armature winding 13 is coaxially matched with the inner side of the laminated stator 12, a proper gap is left between the armature winding 13 and the laminated stator 12 to fill an insulating layer, the insulating layer is glue or adhesive paper, and the glue or the adhesive paper has biocompatibility. The armature winding 13 is wound by adopting an enameled wire with low resistivity, and a pure silver enameled wire or a pure copper enameled wire is preferably selected, so that the resistance voltage drop of the armature winding 13 is reduced to the maximum extent, and the performance of the motor is improved. Three terminal wires 131 are reserved on one side of the armature winding 13 and welded with the wire ends of the lead wires 14 to form a small-volume welding point 132, so that the lead wires 14 are electrically connected with the armature winding 13. The lead 14 typically remains 1-3 meters long due to the requirements of use. The lead 14 is a low-resistivity wire core, and the wire core can be made of silver materials or copper materials. The outer layer of the wire core is coated with the insulating skin to prevent the short circuit risk between the lead 14 and an external metal shell, and the thickness of the single side of the insulating skin is 0.03-0.1 mm, which is greatly reduced compared with the thickness of the conventional process, so that the sectional area of the wire core of the lead 14 is increased as much as possible in a limited volume, the resistance drop of the lead 14 is reduced to the maximum extent, and the performance of the motor is improved.

Further, the outer side of the permanent magnet 22 is provided with a biological coating 23, a gap exists between the biological coating 23 and the potting colloid 11, and the biological coating 23 comprises a base layer and a surface layer which are sequentially arranged from inside to outside. The adhesion of the priming layer is good, 1-2 layers of biocompatible substances are sprayed on the surface of the priming layer to serve as surface layers, so that the permanent magnet 22 without biocompatibility and the priming layer are sealed, and harmful substances are prevented from leaking. The radial thickness of the biological coating 23 is 0.01-0.04 mm, the thickness of the priming layer is 0.003-0.015 mm, and the thickness of the surface layer is 0.01-0.03 mm. The rotor assembly 2 is in a high-speed rotation state during operation, and the surface coating of the permanent magnet 22 needs to bear long-term high-speed liquid impact, so that the liquid impact resistance of the coating needs to be enhanced as much as possible. On the basis of the traditional permanent magnet 22 coating scheme, the novel high-adhesion coating process is adopted on the basis of reasonably adjusting the surface quality of the permanent magnet 22, and the characteristics of easy peeling and corrosion of the coating are further improved.

Further, the sliding bearing 3, the pouring sealant 11 and the shaft core 21 are all made of biocompatible materials, the shaft sleeve 24 is made of biocompatible metal materials, the rolling bearing 4 is of a ball bearing structure and is free of a dust cover so as to allow fluid to smoothly circulate, the materials used by the rolling bearing 4 meet the biocompatibility requirement, the inner ring and the outer ring of the rolling bearing 4 are made of wear-resistant medical stainless steel, the balls are made of ceramic materials, the retainer is made of medical peek materials or stainless steel, and the right cover 15 and the tail cover 16 are made of medical peek materials.

As shown in fig. 2, after the high-pressure liquid enters the interior of the motor through the pores of the rear end bearing, the liquid directly impacts the end of the permanent magnet 22, which easily causes the surface coating on the end of the permanent magnet 22 to be damaged and peeled off. The shaft sleeve 24 of the present invention is a stepped shaft, and the large end 241 of the shaft sleeve 24 is at the left and the small end 242 is at the right, the left side of the large end 241 completely covers the right end surface of the permanent magnet 22 and the right end surface of the bio-coating 23 on the permanent magnet 22, the small end 242 is used for guiding the fluid coming out of the pores of the rolling bearing 4 to flow to the outside of the large end 241 through the right side of the large end 241, so that the fluid directly acts on the right side plane of the large end 241 of the shaft sleeve 24, thereby improving the reliability of the end sealing of the rotor assembly 2.

Further, a plurality of pin holes 31 are formed in the outer side of the sliding bearing 3, and pins wedged on the machine shell extend into the pin holes 31, so that the potting colloid 11 and the sliding bearing 3 are fixedly connected together. The sliding bearing 3 is provided with a plurality of pin holes 31 (shown in fig. 3) with certain depth on the outer side of the sliding bearing 3 according to the internal fluid pressure and the working load impact condition, and the pin holes are used for wedging micro pins (not shown in the figure) from the corresponding position of the machine shell, so that the sliding bearing 3 can be prevented from slipping axially and axially, and the reliability of the micro motor of the utility model is higher.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. The utility model provides a low temperature rise implantable micro motor of whole embedment which characterized in that, includes stator module, rotor subassembly, slide bearing and antifriction bearing, wherein:

the stator assembly comprises a laminated stator, an armature winding, a right cover, potting adhesive, a tail cover and a plurality of lead wires, the laminated stator surrounds the armature winding, an insulating layer is filled in a gap between the laminated stator and the armature winding, the left end of the right cover props against the right end of the laminated stator, one end of each lead wire is welded with a terminal connecting wire of the armature winding, the other end of each lead wire penetrates through the right cover and is exposed out of the right cover, a limiting boss is arranged on the inner wall of the right cover, an accommodating space is formed between the left end of the limiting boss and the right end of the armature winding, and a welding point of the lead wire and the terminal connecting wire of the armature winding is located in the accommodating space; the pouring sealant covers the outer side of the right cover, the outer side and the left end of the laminated stator, the left end and the inner side of the armature winding and the inner side of the limiting boss, and fills the accommodating space; the sliding bearing is installed on the inner wall of the potting colloid, the rolling bearing is sleeved on the inner wall of the right cover, and the outer ring of the sliding bearing is pressed on the right end face of the limiting boss by the tail cover;

the rotor assembly comprises a shaft core, a permanent magnet and a shaft sleeve, the left end and the right end of the shaft core respectively penetrate through the sliding bearing and the rolling bearing, the permanent magnet is fixedly arranged on the shaft core in a penetrating mode, the two ends of the shaft core both exceed the two ends of the permanent magnet, the shaft sleeve is fixedly arranged on the shaft core in a penetrating mode, the left end of the shaft sleeve is abutted to the right end of the permanent magnet, and the right end of the shaft sleeve is abutted to the inner ring of the rolling bearing;

an opening at the right end of the tail cover is used as a fluid inlet, a pore on the rolling bearing is used as a fluid channel I, a space between the sliding bearing and the rolling bearing between the stator assembly and the rotor assembly is used as a fluid channel II, a gap between the sliding bearing and the shaft core is used as a fluid outlet, and the fluid inlet, the fluid channel I, the fluid channel II and the fluid outlet form a fluid flow passage together.

2. The integrally encapsulated low temperature-rise implantable micro-motor according to claim 1, wherein the laminated stator is integrally formed in a hollow cylindrical shape and is integrally bonded by a plurality of laminated sheets, so as to achieve the nondestructive assembly of the laminated stator and ensure the integrity of the microstructure of the laminated stator, the axial thickness of each laminated sheet is not more than 0.1mm and the radial thickness of each laminated sheet is 0.2mm to 0.5mm, and each laminated sheet is made of iron-silicon or iron-nickel alloy.

3. The integrally encapsulated low temperature rise implantable micro-motor according to claim 1, wherein the armature winding is integrally in a hollow cylindrical shape and adopts a pure silver enameled wire or a pure copper enameled wire;

the lead has sinle silk and the insulating skin of cladding on silver system sinle silk, the sinle silk is silver system sinle silk or copper sinle silk.

4. The integrally encapsulated low temperature rise implantable micro-motor according to claim 1, wherein the permanent magnet has a bio-coating on the outer side, a gap exists between the bio-coating and the encapsulation compound, and the bio-coating comprises a bottom layer and a surface layer which are arranged in sequence from inside to outside.

5. The integrally encapsulated low temperature rise implantable micro-motor according to claim 4, wherein the radial thickness of said bio-coating is 0.01mm to 0.04mm, the thickness of said primer layer is 0.003mm to 0.015mm, and the thickness of said surface layer is 0.01mm to 0.03 mm.

6. The integrally potted low temperature rise implantable micro-motor of claim 1, wherein said permanent magnet has a one-pair magnetic pole or two-pair magnetic pole configuration.

7. The integrally encapsulated low temperature-rise implantable micro-motor according to claim 1, wherein the shaft core is provided with a hardened coating for the mating portion with the sliding bearing.

8. The integrally encapsulated low temperature rise implantable micro-motor according to claim 1, wherein the shaft sleeve is a stepped shaft, the large end of the shaft sleeve is arranged at the left side, the small end of the shaft sleeve is arranged at the right side, the left side face of the large end completely covers the right end face of the permanent magnet, the small end is used for guiding fluid coming out of the pore of the rolling bearing to flow to the outer side of the large end through the right side of the large end, so that the fluid directly acts on the right side plane of the large end of the shaft sleeve, and the reliability of end sealing of the rotor assembly is improved.

9. The integrally encapsulated low temperature rise implantable micro-motor according to claim 1, wherein the sliding bearing, the encapsulation colloid and the shaft core are all made of biocompatible materials, the shaft sleeve is made of biocompatible metal materials, the rolling bearing is of a ball bearing structure and is free of a dust cap to allow fluid to smoothly circulate, the materials used for the rolling bearing meet the biocompatibility requirements, the inner ring and the outer ring of the rolling bearing are made of wear-resistant medical stainless steel, the balls are made of ceramic materials, the retainer is made of medical peek materials or stainless steel, and the right cover and the tail cover are made of medical peek materials.

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