CN111840681A

CN111840681A - Blood pump and heart catheter

Info

Publication number: CN111840681A
Application number: CN202010624127.6A
Authority: CN
Inventors: 高琪; 刘星利; 柳光茂; 魏润杰
Original assignee: Zhejiang Diyuan Medical Equipment Co ltd
Current assignee: Zhejiang Diyuan Medical Equipment Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-10-30

Abstract

The invention discloses a blood pump and a heart catheter, wherein the blood pump comprises: the pump comprises a pump shell, a pump rotor and a micro motor, wherein the pump rotor and the micro motor are arranged in the pump shell; the blade is provided with a flexible part and a hard part along the radial direction of the rotating shaft, one end of the rotating shaft is provided with a clamping part, and the power output end of the micro motor is inserted in the clamping part of the rotating shaft; a telescopic deformation part and a state adjusting part are arranged in the pump shell; the telescopic deformation part is used for accommodating the pump rotor, and the state adjustment part controls the telescopic deformation part to be switched between a contraction state and an extension state; when the telescopic deformation part is in a contraction state, a first accommodating space is arranged in the telescopic deformation part; the flexible part of the vane of the pump rotor bends along the radial direction of the rotating shaft and is bundled in the first accommodating space; when flexible deformation portion is in the state of extending, has the second accommodation space in the flexible deformation portion, and the flexible portion of the blade of pump rotor keeps the state of extending, and the blade of pump rotor can the second accommodation space internal rotation.

Description

Blood pump and heart catheter

Technical Field

The embodiment of the application relates to pump technology in medical treatment, in particular to a blood pump and a heart catheter.

Background

At present, when a large-scale operation particularly relates to a heart operation, the operation of the heart is ensured, and simultaneously, the blood of a medical object is enabled to operate normally, so that the normal circulation of the blood of the medical object is ensured, and the medical object maintains normal vital signs.

Currently, a blood pump device is commonly used to promote the normal circulation of blood of a medical object during an operation, that is, one end of the blood pump device, which is provided with the blood pump, is inserted into a ventricle of the medical object, the other end of the blood pump device is inserted into an artery of a heart, and blood in the ventricle of the heart is pumped into the artery of the medical object by the operation of the blood pump, so that the normal blood circulation of the medical object is ensured, and the blood of the medical object can still normally circulate when the heart-related operation is performed on the medical object.

In a conventional method of placing a blood pump in a ventricle of a medical subject, the blood pump is placed in a catheter, the catheter is inserted into the ventricle of a heart through an artery of the medical subject, the blood pump is placed in the ventricle of the medical subject, and blood in the ventricle of the medical subject is pumped into the artery of the medical subject by the blood pump, so that blood circulation of the medical subject is normally performed. The diameter of the artery of a general medical object is smaller, and the diameter of the catheter is about 6-7mm, so that the diameter of the blood pump is ensured to be small enough, when the blood pump pumps blood, the pumped blood volume is ensured to meet the requirement of basic blood circulation of the medical object, the blade of the blood pump cannot be too small, otherwise, the pumping efficiency is difficult to ensure, and when the blade of the blood pump is larger, the blade cannot be easily placed in the heart chamber of the medical object.

Disclosure of Invention

In view of the above, an aspect of the embodiments of the present disclosure provides a blood pump and a heart catheter, which can adjust the overall diameter of the blood pump, when the blood pump is placed in a heart ventricle, a pump blade deforms to reduce the diameter of the blood pump, and after the blood pump is placed in the heart ventricle, the blade of the blood pump returns to a normal size, thereby ensuring the pumping efficiency of the blood pump.

The embodiment of the present application provides a blood pump, includes: the pump comprises a pump shell, a pump rotor and a micro motor, wherein the pump rotor and the micro motor are arranged in the pump shell; the blade is provided with a flexible part and a hard part along the radial direction of the rotating shaft, and the flexible part and the hard part are connected smoothly and integrally; one end of the rotating shaft is provided with a clamping part, and the power output end of the micro motor is inserted in the clamping part of the rotating shaft to provide working power for the pump rotor;

a telescopic deformation part and a state adjusting part are arranged in the pump shell; the telescopic deformation part is used for accommodating the pump rotor, and the state adjustment part controls the telescopic deformation part to be switched between a contraction state and an extension state; when the telescopic deformation part is in a contraction state, a first accommodating space is arranged in the telescopic deformation part; the flexible part of the vane of the pump rotor bends along the radial direction of the rotating shaft and is bundled in the first accommodating space; when the telescopic deformation part is in an extending state, a second accommodating space is formed in the telescopic deformation part, the flexible part of the blade of the pump rotor is kept in the extending state, and the blade of the pump rotor can rotate in the second accommodating space.

As one implementation manner, the flexible portion of the blade is disposed on a side close to the rotating shaft in a radial direction of the rotating shaft, and the hard portion is disposed on a side far from the rotating shaft in the radial direction of the rotating shaft; the flexible parts of the blades are fixed on the periphery of the rotating shaft so that the blades are distributed on the periphery of the cylindrical rotating shaft.

As one implementation, the flexible portion and the hard portion of the blade have a length ratio of 1:4 to 3:1 in a radial direction of the rotating shaft.

As an implementation manner, the flexible portion of the blade sequentially comprises more than two material sections with different elastic moduli along the axial direction of the rotating shaft;

the elastic modulus of the materials of the different material sections of the flexible part of the blade is gradually reduced from the input side of the pumping object to the target direction.

As one implementation manner, the flexible portion of the blade is disposed on a far side of the rotating shaft in a radial direction of the rotating shaft, and the hard portion is disposed on a near side of the rotating shaft in the radial direction of the rotating shaft; the hard parts of the blades are fixed on the periphery of the rotating shaft so that the blades are distributed on the periphery of the cylindrical rotating shaft.

As one implementation, the flexible portion and the hard portion of the blade have a length ratio of 1:4 to 4:1 in a radial direction of the rotating shaft.

In one implementation, the flexible portion of the blade is made of a material having an elastic modulus of 8Mpa to 80 Mpa.

As one implementation mode, the telescopic deformation part comprises an annular support body and a connecting body, wherein the annular support body is formed by a metal rod or a metal wire in a continuous bending mode to form a closed ring; the connector is formed by a metal rod or a metal wire in a continuous bending mode, and the connector is provided with a first free end of the metal rod or the metal wire and a second free end of the metal rod or the metal wire; the connecting body is connected with two adjacent annular supporting bodies along the axial direction of the annular supporting bodies; the first free end of the metal rod or the metal wire is connected with the bending part of one annular support body of the two adjacent annular support bodies, and the second free end of the metal rod or the metal wire is connected with the bending part of the other annular support body of the two adjacent annular support bodies.

As one implementation, the blades are 1 to 6.

As an implementation manner, when the number of the blades is 1, the blades are wound on the periphery of the other end of the cylindrical rotating shaft from the periphery of one end of the cylindrical rotating shaft in a manner of moving towards the other end of the cylindrical rotating shaft; the number of the circumference of the cylindrical rotating shaft wound by the blades is 0.2 to 5 weeks;

When the number of the blades is 2 to 5, the blades move from the equant part at the periphery of one end of the cylindrical rotating shaft to the other end of the cylindrical rotating shaft, and each blade is wound at the corresponding equant part at the periphery of the other end of the cylindrical rotating shaft in a parallel manner; the number of the circumference of the blade around the cylindrical rotating shaft is 0.1 to 5.

The embodiment of the application also provides a heart catheter, wherein the catheter can be inserted into a ventricle of a heart along the artery of a human body, and the blood pump is inserted into the catheter.

The pump rotor structure of this application embodiment, the radial part of pump rotor's blade along the pivot adopts flexible material to make, and the blade has flexible portion and stereoplasm portion, and the elastic modulus of the material of flexible portion is less than the elastic modulus of the material of stereoplasm portion. When the blood pump is inserted into a heart ventricle, the blades of the pump rotor are inserted into the telescopic deformation part of the pump shell, the telescopic deformation part is in a contraction state through the state adjustment part, and the blades of the pump rotor are bent and deformed under pressure, so that the overall diameter of the pump rotor is matched with the inner diameter of the telescopic deformation part, the overall outer diameter of the whole blood pump is thinned, and the blood pump is easier to place when the blood pump is placed to the heart ventricle of a medical object. After the blood pump is placed in the ventricle of the medical object, the telescopic deformation part is in the extension state by operating the state adjustment part, so that the blades of the pump rotor are restored to the normal state from the deformation state, and the pump rotor can normally operate in the telescopic deformation part to pump blood. Because the blade part of the pump rotor in the embodiment of the application adopts the design of the flexible part, the physiological indexes of blood are damaged less and red blood cells are hardly damaged in the rotating process of the pump rotor, so that the physiological indexes of the pumped blood can be ensured, and the pump rotor can be suitable for any medical objects, particularly medical objects with complications.

Drawings

FIG. 1 is a schematic diagram of a blood pump according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a pump rotor assembly according to an embodiment of the present application;

FIG. 3 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;

FIG. 4 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;

FIG. 5 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;

FIG. 6 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;

FIG. 7 is a schematic view of a cardiac catheter embodying the present application;

fig. 8 is a schematic structural view of a telescopic deformation portion of a pump housing according to an embodiment of the present application;

fig. 9 is a schematic structural view of a telescopic deformation portion of a pump housing according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a blood pump according to an embodiment of the present disclosure.

Detailed Description

The essence of the technical solution of the embodiments of the present application is explained in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram illustrating a structure of a blood pump according to an embodiment of the present disclosure, as shown in fig. 1, the blood pump according to the embodiment of the present disclosure includes: the pump comprises a pump shell 2, a pump rotor 1 and a micro motor which are arranged in the pump shell 2, wherein the pump rotor 1 comprises a rotating shaft 10 and a blade 20; the blade 20 is provided with a flexible portion 201 and a hard portion 202 along the radial direction of the rotating shaft 10, and the flexible portion 201 and the hard portion 202 are integrally and smoothly connected; a clamping part 101 is arranged at one end of the rotating shaft 10, and a power output end 301 of the micro motor is inserted into the clamping part 101 of the rotating shaft 10 to provide working power for the pump rotor 1; here, the power output end of the micro motor may be a rotating shaft of the micro motor, which is inserted into the retaining part 101 of the rotating shaft 10 and fixedly connected with the retaining part 101 of the rotating shaft 10 in a retaining manner, so as to drive the rotating shaft 10 to rotate, and the pump rotor 1 rotates to perform blood pumping. As an implementation manner, for example, a linear or cross-shaped slot may be disposed in the clamping portion 101, and the outermost end of the rotating shaft of the micro motor is correspondingly disposed in a linear or cross shape, so that the rotating shaft of the micro motor is inserted into the clamping portion 101 of the rotating shaft 10 to drive the rotating shaft 10 to rotate. Or, a polygonal or circular groove is formed in the clamping part 101, and the rotating shaft of the micro motor is provided with a corresponding shape and is in interference fit with the groove of the clamping part 101 to drive the rotating shaft 10 to rotate.

A telescopic deformation part and a state adjusting part are arranged in the pump shell 2; the telescopic deformation part is used for accommodating the pump rotor 1, and the state adjustment part controls the telescopic deformation part to be switched between a contraction state and an extension state; when the telescopic deformation part is in a contraction state, a first accommodating space is arranged in the telescopic deformation part; the flexible parts of the vanes 20 of the pump rotor 1 are bent in the radial direction of the rotating shaft 10 and are bound in the first accommodating space; when the telescopic deformation portion is in an extended state, a second accommodating space is formed in the telescopic deformation portion, the flexible portion of the vane 20 of the pump rotor 1 keeps the extended state, and the vane 20 of the pump rotor 1 can rotate in the second accommodating space.

Fig. 2 is a schematic structural diagram of a pump rotor according to an embodiment of the present application, and as shown in fig. 2, the pump rotor according to the embodiment of the present application includes: a cylindrical rotating shaft 10 and a vane 20.

Fig. 3 is a schematic structural diagram of a vane of a pump rotor according to an embodiment of the present application, and fig. 4 is a schematic structural diagram of a vane of a pump rotor according to an embodiment of the present application, as shown in fig. 3 and 4, the vane 20 has a flexible portion 201 and a hard portion 202, and the flexible portion 201 and the hard portion 202 are integrally and smoothly connected; the flexible portion 201 of the vane 20 is fixed on the periphery of the cylindrical rotating shaft 10 so that the vane 20 is distributed on the periphery of the cylindrical rotating shaft 10.

Another design structure of the blade having the flexible portion will be described with reference to fig. 5 and 6. Fig. 5 is a schematic structural diagram of a pump rotor according to an embodiment of the present application, and fig. 6 is a schematic structural diagram of a vane of the pump rotor according to an embodiment of the present application, as shown in fig. 5 and fig. 6, in this example, a flexible portion 201 of the vane 20 is disposed above a hard portion 202, and the hard portion 202 of the vane 20 is fixed to a periphery of the cylindrical rotating shaft 10, so that the vanes 20 are distributed on the periphery of the cylindrical rotating shaft 10.

In the embodiment of the present application, through the design that sets up blade 20 as hard portion 202 and flexible portion 201, when pump rotor 1 rotates and drives blade 20 and rotate, after blade 20 contacts with pumping object such as blood, under the effort that pumping object applyed, flexible portion 201 produces the deformation, thereby under the condition that pump rotor rotates at a high speed, because the texture of flexible portion 201 is comparatively soft, have certain guard action to pumping object, the damage of blade to pumping object such as red blood cell in the blood is less, when pumping object to the target direction, pumping object such as physiological index such as blood can not destroyed.

Further, when the pump rotor 1 is placed in the expansion/contraction deformable portion of the pump housing 2, the expansion/contraction deformable portion is brought into a contracted state by the state adjustment portion, and the blades 20 of the pump rotor 1 are pressed to be bent and deformed, so that the entire diameter of the pump rotor 1 is matched with the inner diameter of the expansion/contraction deformable portion, and the entire outer diameter of the blood pump according to the embodiment of the present application is made small, and thus the blood pump can be more easily placed when placed in a cardiac ventricle of a medical subject. After the blood pump is placed in the ventricle of the medical treatment subject, the state adjustment unit is operated to place the expansion/contraction deformation unit in the expanded state, so that the vanes 20 of the pump rotor 1 are restored from the deformed state to the normal state, and the pump rotor 1 can be normally operated in the expansion/contraction deformation unit to pump blood.

In the embodiment of the present application, the flexible material for manufacturing the flexible portion 201 has a certain elasticity requirement, and the material has a certain elasticity and flexibility, wherein the elastic modulus of the material of the flexible portion 201 is 8Mpa to 80 Mpa; the material of the hard portion 202 has an elastic modulus of 35Mpa to 195Mpa, and the material of the flexible portion 201 has an elastic modulus lower than that of the hard portion 202.

In the embodiment of the present application, although the material of the flexible portion 201 is selected, the smaller the elastic modulus of the selected material is, the better the bending deformation of the vane 20 of the pump rotor 1 with the smaller elastic modulus is, the larger the bending deformation amount is, and the flexible portion can be more easily placed in the telescopic deformation portion of the pump housing 2; however, in the embodiment of the present application, the pumping efficiency of the pump rotor 1 is also considered, and therefore, the pumping efficiency of the pump rotor 1 is ensured to be as high as possible on the premise that the physiological index of the pumping object, such as blood, is not damaged. In the experiment for the flexible material, the elastic modulus of the material of the flexible portion 201 is preferably 34.2Mpa to 39.1 Mpa. When the flexible material is in the elastic modulus interval, the damage to the physiological indexes of the pumping object such as blood is small, and the pumping efficiency of the pump rotor can be ensured. For example, when the flexible material with the elastic modulus of 36.7Mpa to 27.4Mpa is adopted, the pumping efficiency of the pump rotor in the embodiment of the present application can reach 84.8% of the pumping efficiency of the pump blade adopting the full-rigid structure, the pumping efficiency of the pump rotor is not obviously reduced, and for a pumping object such as blood, the damage of red blood cells is hardly seen in the sampling of the target direction end, and the occurrence of hemolysis is basically avoided. In addition, no destruction was observed in the target blood in the leukocyte index, hemoglobin index, serum-bound globin index, platelet index, and the like. Meanwhile, the flexible portion 201 is made of a flexible material with the elastic modulus, so that the bending deformation of the pump rotor 1 can meet the deformation requirement of the whole outer diameter of the blood pump.

In the embodiment of the present application, the material of the flexible portion 201 is not limited to the hard material, and may be an alloy material satisfying the above elastic modulus requirement, or a material such as a resin, a synthetic resin, a mixed resin, or the like satisfying the above elastic modulus requirement. In the embodiment of the present invention, the flexible material of the flexible portion is preferably a resin material.

In the embodiment of the present application, there is no requirement for the material of the hard portion 202, as long as the material of the hard portion 202 has a higher elastic modulus than the material of the flexible portion 201. The difference between the elastic modulus of the material of the hard portion 202 and the elastic modulus of the material of the flexible portion 201 is preferably 40Mpa to 60Mpa under the condition that the integral processing of the hard portion 202 and the flexible portion 201 is ensured. In the embodiment of the present application, when the flexible portion 201 is made of resin, the hard portion 202 is preferably made of resin with higher hardness. When the flexible portion 201 is made of an alloy, the hard portion 202 is preferably made of an alloy or a metal having a higher hardness.

In this embodiment, when the cylindrical rotating shaft 10 rotates, the pumping object can apply a reaction thrust to the blade 20, the flexible portion 201 of the blade 20 deforms to make the blade 20 bend along the direction of the reaction thrust, and the pumping object is pumped to a target direction under the driving of the bent blade.

As shown in fig. 3 to 6, in the embodiment of the present application, the length ratio of the flexible portion 201 and the hard portion 202 of the blade 20 in the radial direction of the cylindrical rotating shaft 10 is 1:4 to 4: 1. It will be understood by those skilled in the art that the larger the proportion of the flexible portion 201 in the vanes 20 of the pump rotor 1, the greater the amount of bending of the vanes 20, and thus, the easier it is to place it in the telescopically deformed portion of the pump housing 2, and the more convenient it is to introduce the blood pump into the ventricle of the medical subject, but in view of the pumping efficiency of the pump rotor 1, it is also necessary that the vanes 20 of the pump rotor 1 have a certain stiffness to ensure the normal pumping of the blood of the medical subject.

In the blade 20 structure shown in fig. 3 and 4, the ratio of the height of the flexible portion 201 at the lower end to the height of the hard portion 202 at the upper end is preferably 1:4 to 2: 1. In one implementation, the length ratio of the flexible part and the hard part of the blade in the radial direction of the cylindrical rotating shaft can be 10:37, 9:26, 11:24, 4:7 or 11: 14.

In a preferred embodiment, in the blade 20 structure shown in fig. 3 and 4, the flexible portion 201 of the blade 20 is made of at least two materials having different elastic moduli; the elastic modulus of the material of the different material sections of the flexible portion 201 of the vane 20 decreases from the input side to the target direction of the pumping target. As an implementation example, the flexible portion 201 of the blade 20 is made of two sections of materials with different elastic moduli, or made of three sections of materials with different elastic moduli, or made of four sections of materials with different elastic moduli.

In the embodiment of the present application, the flexible portion 201 of the vane 20 is made of flexible materials with different elastic moduli, so that the vane 20 can deform around the periphery of the cylindrical rotating shaft 10, thereby forming a bending deformation of the pump vane, and improving the pumping efficiency of the pump rotor of the embodiment of the present application.

In the blade 20 structure shown in fig. 5 and 6, the ratio of the radial length of the flexible portion 201 to the radial length of the cylindrical rotating shaft 10 to the rigid portion 202 is preferably 1:3 to 1: 1. In one implementation, the flexible portion and the rigid portion of the blade have a length ratio of 7:19, 10:29, 9:25, 3:11, 4:9, or 11:15 in a radial direction of the cylindrical rotating shaft.

In the embodiment of the present application, as an implementation manner, the number of the blades is 1 to 6.

As shown in fig. 2, when the number of the blades 20 is 1, the blades 20 are wound around the periphery of the other end of the cylindrical rotating shaft 10 from the periphery of one end of the cylindrical rotating shaft 10 to move toward the other end of the cylindrical rotating shaft 10; the number of the circumference of the blade 20 around the cylindrical rotating shaft 10 is 0.2 to 5. When the number of the blades 20 is 1, the number of the blades 20 wound around the circumference of the cylindrical rotating shaft 10 is preferably one or more.

In the embodiment of the present invention, although the blades 20 adopt the design of the flexible portion 201, the design of the blades in the pump rotor structure of the embodiment of the present invention still needs to adopt the design principle of the common pump rotor blades, that is, the pump input angle and the pump output angle need to be set. Since the design of pump rotor blades is conventional, it is not important to discuss here. The embodiment of the present application can partially replace the input angle and the output angle of the vane of the pump rotor by adopting the design of the partially flexible portion for the vane 20, that is, the angle of the vane can be slightly smaller than that of the conventional pump rotor vane, so that the same effect as that of the vane of the conventional pump rotor can be achieved based on the deformation of the flexible portion 201 of the vane 20.

In one embodiment, when the number of the vanes 20 of the pump rotor is 2 to 6, the vanes 20 move from the bisector at the circumference of one end of the cylindrical rotating shaft 10 to the other end of the cylindrical rotating shaft, and each vane 20 is wound around the corresponding bisector at the circumference of the other end of the cylindrical rotating shaft 10 in a parallel manner; the number of the circumference of the blade 20 around the cylindrical rotating shaft is 0.1 to 5.

Fig. 7 is a schematic view showing an application of a cardiac catheter according to an embodiment of the present invention, in which, as shown in fig. 7, a blood pump is connected to the cardiac catheter, and when the blood pump is placed in a ventricle of a heart, a pump rotor 1 with its vanes 20 is inserted into a telescopic deformation portion of a pump housing 2 of the blood pump, and the telescopic deformation portion is in a contracted state by a state adjustment portion, and the vanes 20 of the pump rotor 1 are pressed to be bent and deformed, so that the entire diameter of the pump rotor 1 matches the inner diameter of the telescopic deformation portion, and the entire outer diameter of the blood pump is made thin, and thus, the blood pump can be more easily placed in the ventricle of the heart of a medical subject. After the blood pump is placed in the ventricle of the medical object, the telescopic deformation part is in the extension state by operating the state adjustment part, so that the blades of the pump rotor are restored to the normal state from the deformation state, and the pump rotor can normally operate in the telescopic deformation part to pump blood.

In addition, the pump rotor structure of this application embodiment, the blade part of pump rotor adopts flexible material to make, like this, when pump rotor is rotatory, makes pump rotor's blade produce deformation and crooked, and crooked blade forms pump rotor blade, pumps blood to the target direction. In the embodiment of the application, the flexible part of the blade is fixed on the periphery of the cylindrical rotating shaft, and the flexible part of the blade is naturally deformed by the reaction force of a pumping object along the rotating direction when the rotor rotates, so that the pump blade of the pump is formed. In addition, because the blade part of the pump rotor of the embodiment of the application is made of the flexible material, in the rotation process of the pump, the blade of the pump rotor can be bent and deformed when pumping blood, the damage to the physiological index of the blood is small, and red blood cells are hardly damaged, so that the physiological index of the pumped blood can be ensured, and the pump rotor can be suitable for any medical objects, particularly the medical objects with complications.

Fig. 8 is a schematic structural view of a telescopically deformable part of a pump housing according to an embodiment of the present invention, fig. 9 is a schematic structural view of a telescopically deformable part of a pump housing according to an embodiment of the present invention, and as shown in fig. 8 and 9, the telescopically deformable part of a pump housing 2 according to an embodiment of the present invention includes a ring-shaped support body 203 and a connecting body 204, wherein the ring-shaped support body 203 is formed by continuously bending a metal rod or a metal wire into a closed ring; the connecting body 204 is formed by a metal rod or a metal wire in a continuous bending mode, and the connecting body 204 is provided with a first free end 205 of the metal rod or the metal wire and a second free end 206 of the metal rod or the metal wire; the connecting body 204 connects two adjacent annular supports 203 along the axial direction of the annular supports 203; the first free end 205 of the metal rod or wire is connected to the bent portion 207 of one of the two adjacent ring-shaped supports 203, and the second free end 206 of the metal rod or wire is connected to the bent portion 207 of the other ring-shaped support 206 of the two adjacent ring-shaped supports 203.

In one embodiment, the annular support 203 is formed by a metal rod or wire that is continuously bent in a substantially arcuate shape to form a closed loop. The connecting body 204 is formed of a metal rod or wire in a substantially arcuate shape in a continuous bending manner. In the embodiment of the present application, the metal rod or the metal wire forming the annular support 203 may be made of nickel-chromium alloy, and the diameter of the metal rod or the metal wire is 0.02 to 0.5 mm. The metal rod or wire forming the annular support 203 may be made of iron-nickel-chromium alloy, and the diameter of the metal rod or wire is 0.08 to 0.5 mm. In the embodiment of the present application, the overall hardness of the annular support, the inner diameter of the annular support in the expanded state, and the inner diameter of the annular support in the contracted state can be adjusted by setting the interval and length of the bow-shaped continuous bending. The metal rod or wire forming the connecting body 204 may be made of iron-nickel-chromium alloy, and the diameter of the metal rod or wire is 0.02 to 0.25mm, i.e. the metal rod or wire of the connecting body 204 may be made thinner to increase the flexibility thereof.

Fig. 10 is a schematic view of an application of the blood pump according to the embodiment of the present application, and as shown in fig. 10, the following describes how the blood pump according to the embodiment of the present application is used in combination with the structures shown in fig. 8, 9 and 10. In the embodiment of the present application, the pump housing shown in fig. 8 and 9 is collapsible and expandable, when the blood pump of the embodiment of the present application needs to be placed in a body of a medical subject, the blood pump of the present application may be set in a collapsed state, that is, the pump rotor of the embodiment of the present application is placed in the accommodation space of the pump housing in a manner of bending the blades, for example, the pump housing of the embodiment of the present application may be held at both ends thereof and stretched to deform the pump housing in the axial direction to form a thin tube shape, and the pump housing may be held in the thin tube shape by a support rod, and then the pump rotor may be inserted into the thin tube-shaped pump housing, and the pump housing inserted with the pump rotor may be connected to the insertion tube 30, as shown in fig. 7, the tube connected with the pump housing may be inserted into a human body through an arterial blood vessel of the medical subject, for example, the blood pump of the embodiment of the, after the pump housing keeping the thin tube shape is inserted into the ventricle of the heart, the support rod keeping the thin tube shape of the pump housing can be taken down from the pump housing, so that the pump housing is stretched under the support of the support rod before, and after the support rod is taken down, because the pump housing is arranged in the hollow shape shown in fig. 8, the metal rod or the metal wire forming the pump housing has elasticity, namely the pump housing has the capability of keeping the original shape, the pump housing begins to expand along the radial direction and contracts in the axial direction to be shortened and restore to the state before stretching as much as possible, so that the accommodating space in the pump housing is enlarged, namely the inner diameter of the pump housing is enlarged, the length is shortened, the vanes of the pump rotor are contracted in the pump housing before, and after the pump housing is restored, the vanes of the pump rotor are also restored to the non-bending state, the inner diameter of the pump housing is larger than the overall diameter of the pump rotor even though the pump rotor can rotate within the pump housing without touching the outer wall of the pump housing. In the embodiment of the application, when the pump casing after having dismantled the bracing piece and having recovered to the original state, the pump casing is hollow out construction, but can support medical treatment object's blood vessel etc. formation to leave the rotatory space of sufficient pump rotor in making the pump casing, so that the pump rotor can be free rotation in the pump casing, thereby can follow the pumping direction and pump the blood in medical treatment object blood vessel or the heart chamber to the destination, guarantee the normal blood circulation of medical treatment object.

In the embodiment of the present application, the position of the pump rotor in the pump housing can be maintained by inserting the power output end of the micro motor into the clamping portion 101 of the rotating shaft 10 of the pump rotor, for example, the center line of the rotating shaft of the pump rotor and the center line in the pump housing are maintained on a straight line as much as possible, so that the pump rotor is not touched with the inner wall of the pump housing during rotation, and the pumping efficiency of the pump rotor is ensured. In this example, the support rod provided on the pump housing corresponds to the state adjustment portion in the pump housing in the embodiment of the present application. In the embodiment of the present application, the pump housing is an abstract concept, and any component that can cover the pump rotor and form the function of the blood pump of the embodiment of the present application, such as the pump housing, can be used as the relevant component of the embodiment of the present application.

As another implementation manner, when the blood pump of the embodiment of the present invention is to be placed in a body of a medical subject, the blood pump of the embodiment of the present invention may be set in a contracted state, that is, the pump rotor of the embodiment of the present invention is placed in the accommodation space of the pump housing in a manner that the vanes are bent, for example, the pump housing of the embodiment of the present invention may be formed in a thin tube shape by axially deforming the pump housing by stretching both ends thereof, and then the pump rotor may be inserted into the thin tube-shaped pump housing, and the pump housing into which the pump rotor is inserted may be inserted into the hollow tube 30, as shown in fig. 7, the hollow tube 30 provided with the blood pump of the embodiment of the present invention may be inserted into a human body through an arterial blood vessel of the medical subject, for example, the pump of the embodiment of the present invention may be inserted into a ventricle of the heart through femoral artery, and after the hollow tube 30 into which the blood pump is inserted is introduced into a target site, the pump casing holding the tubule form is pushed out from the hollow guide duct 30, and after the pump casing holding the tubule form is pushed out from the hollow guide duct 30, because the pump housing is hollow as shown in fig. 8, and the metal rod or wire composing the pump housing has elasticity, i.e., the pump casing has the ability to remain in its original shape, the pump casing begins to expand in the radial direction and contracts in the axial direction to become shorter, so as to restore to the state before stretching as much as possible, thus the accommodating space in the pump shell becomes larger, that is, the inner diameter of the pump housing becomes larger and the length becomes shorter, the vanes of the pump rotor are previously contracted in the pump housing by being bent, after the pump casing is restored, the vanes of the pump rotor are also restored to the non-bent state, and, in the present embodiment, set up the pump casing and reply original condition back, the internal diameter of pump casing is greater than pump rotor's whole diameter, even pump rotor can rotate and can not touch the outer wall of pump casing in the pump casing. In the embodiment of the application, after the pump casing body is pushed out of the hollow catheter and is restored to the original state, the pump casing body is of a hollow structure, but can support blood vessels and the like of a medical object, so that a space enough for the pump rotor to rotate is reserved in the pump casing body, the pump rotor can freely rotate in the pump casing body, blood in the blood vessels or the heart chambers of the medical object can be pumped to a destination along the pumping direction, and normal blood circulation of the medical object is guaranteed.

In the embodiment of the present application, the position of the pump rotor in the pump housing can be maintained by inserting the power output end of the micro motor into the clamping portion 101 of the rotating shaft 10 of the pump rotor, for example, the center line of the rotating shaft of the pump rotor and the center line in the pump housing are maintained on a straight line as much as possible, so that the pump rotor is not touched with the inner wall of the pump housing during rotation, and the pumping efficiency of the pump rotor is ensured. In this example, the hollow tube housed in the pump housing corresponds to the condition adjustment portion in the pump housing in the embodiment of the present application. In the embodiment of the present application, the pump housing is an abstract concept, and any component that can cover the pump rotor and form the function of the blood pump of the embodiment of the present application, such as the pump housing, can be used as the relevant component of the embodiment of the present application.

The embodiment of the application also describes a heart catheter which can be inserted into a ventricle of a heart along a human artery, and the blood pump is inserted into the catheter. The structure of the cardiac catheter of the embodiment of the present application can be referred to the structure shown in fig. 7. The blood pump has the blood pump structure shown in fig. 1 to 9.

Furthermore, the features and benefits of the present invention are described with reference to exemplary embodiments. Accordingly, the invention is expressly not limited to these exemplary embodiments illustrating some possible non-limiting combination of features which may be present alone or in other combinations of features.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims

1. A blood pump, comprising: the pump comprises a pump shell, a pump rotor and a micro motor, wherein the pump rotor and the micro motor are arranged in the pump shell; the blade is provided with a flexible part and a hard part along the radial direction of the rotating shaft, and the flexible part and the hard part are connected smoothly and integrally; one end of the rotating shaft is provided with a clamping part, and the power output end of the micro motor is inserted in the clamping part of the rotating shaft to provide working power for the pump rotor;

2. The blood pump according to claim 1, wherein the flexible portion of the blade is provided on a side closer to the rotating shaft in a radial direction of the rotating shaft, and the hard portion is provided on a side farther from the rotating shaft in the radial direction of the rotating shaft; the flexible parts of the blades are fixed on the periphery of the rotating shaft so that the blades are distributed on the periphery of the cylindrical rotating shaft.

3. The blood pump of claim 2, wherein a ratio of lengths of the flexible portion and the rigid portion of the blade in a radial direction of the shaft is 1:4 to 3: 1.

4. The blood pump of claim 2, wherein the flexible portion of the blade comprises two or more material segments having different elastic moduli in order along the axial direction of the rotating shaft;

5. The blood pump according to claim 1, wherein the flexible portion of the blade is provided on a side of the rotating shaft that is farther from the rotating shaft in a radial direction of the rotating shaft, and the hard portion is provided on a side of the rotating shaft that is closer to the rotating shaft in the radial direction of the rotating shaft; the hard parts of the blades are fixed on the periphery of the rotating shaft so that the blades are distributed on the periphery of the cylindrical rotating shaft.

6. The blood pump of claim 5, wherein a ratio of lengths of the flexible portion and the rigid portion of the blade in a radial direction of the shaft is 1:4 to 4: 1.

7. The blood pump of any one of claims 1 to 6, wherein the flexible portion of the blade is made of a material having an elastic modulus of 8Mpa to 80 Mpa.

8. The blood pump of claim 1, wherein the elastically deformable portion includes an annular support body formed of a metal rod or a metal wire in a continuous bending manner into a closed loop, and a connector; the connector is formed by a metal rod or a metal wire in a continuous bending mode, and the connector is provided with a first free end of the metal rod or the metal wire and a second free end of the metal rod or the metal wire; the connecting body is connected with two adjacent annular supporting bodies along the axial direction of the annular supporting bodies; the first free end of the metal rod or the metal wire is connected with the bending part of one annular support body of the two adjacent annular support bodies, and the second free end of the metal rod or the metal wire is connected with the bending part of the other annular support body of the two adjacent annular support bodies.

9. The blood pump of claim 1, wherein the blades are 1-6 blades.

10. The blood pump of claim 9, wherein if the number of the blades is 1, the blades are wound around a periphery of one end of the cylindrical rotating shaft so as to move from the periphery of the one end of the cylindrical rotating shaft to the periphery of the other end of the cylindrical rotating shaft; the number of the circumference of the cylindrical rotating shaft wound by the blades is 0.2 to 5 weeks;

11. A cardiac catheter insertable along a body artery into a ventricle of a heart, the catheter having inserted therein a blood pump of any one of claims 1 to 10.