Blood pumps and cardiac catheters

Abstract

The present invention discloses a blood pump and a cardiac catheter, comprising: a pump housing, a pump rotor and a micro motor arranged in the pump housing, the pump rotor comprising a cylindrical rotating shaft and blades; the blades are provided with a flexible portion and a hard portion along the radial direction of the cylindrical rotating shaft, a clamping portion is provided at one end of the cylindrical rotating shaft, and a power output end of the micro motor is inserted into the clamping portion of the cylindrical rotating shaft; a telescopic deformation portion and a state adjustment portion are provided in the pump housing; the telescopic deformation portion is used to accommodate the pump rotor, and the state adjustment portion controls the telescopic deformation portion to switch between a contracted state and an extended state; when in the contracted state, a first accommodating space is provided in the telescopic deformation portion; the flexible portion of the blade of the pump rotor is bent along the radial direction of the cylindrical rotating shaft and is bound in the first accommodating space; when the telescopic deformation portion is in the extended state, a second accommodating space is provided in the telescopic deformation portion, the flexible portion of the blade of the pump rotor remains in the extended state, and the blade of the pump rotor can rotate in the second accommodating space.

Description

Technical Field

[0001] The embodiments of the present application relate to pump technology in medical treatment, and in particular, to a blood pump and a cardiac catheter. Background Art

[0002] At present, in some large operations, especially those involving heart operations, while ensuring the surgical operation on the heart, it is also necessary to ensure the normal circulation of the blood of the medical subject and the normal vital signs of the medical subject.

[0003] Currently, a blood pump device is commonly used to promote the normal circulation of blood in a medical subject undergoing surgery. That is, the blood pump device has one end of the blood pump inserted into the ventricle of the medical subject, and the other end of the blood pump device is inserted into the heart artery. Through the operation of the blood pump, the blood in the heart ventricle is pumped into the artery of the medical subject, thereby ensuring the normal blood circulation of the medical subject, so that the medical subject's blood can still circulate normally when the medical subject undergoes heart-related surgery.

[0004] At present, the method of placing a blood pump in the ventricle of a medical subject is to place the blood pump in a catheter, insert the catheter into the ventricle of the heart through the artery of the medical subject, so that the blood pump is placed in the ventricle of the medical subject, and the blood in the ventricle of the medical subject is pumped to the artery of the medical subject by the blood pump, so that the blood circulation of the medical subject proceeds normally. However, the diameter of the artery of a general medical subject is relatively small, and the diameter of the catheter is about 6-7mm. In this way, it is necessary to ensure that the diameter of the blood pump is small enough, and when the blood pump pumps blood, the amount of blood pumped must be ensured to meet the basic blood circulation needs of the medical subject. This requires that the blades of the blood pump cannot be too small, otherwise it is difficult to ensure the pumping efficiency, and when the blades of the blood pump are large in size, it is not easy to place it in the ventricle of the medical subject. Summary of the invention

[0005] In view of this, one embodiment of the present application provides a blood pump and a cardiac catheter, which can make the overall diameter of the blood pump adjustable. When the blood pump is placed in the heart ventricle, the pump blades are deformed to reduce the diameter of the blood pump. After being placed in the heart ventricle, the blades of the blood pump return to normal size, thereby ensuring the pumping efficiency of the blood pump.

[0006] The embodiment of the present application provides a blood pump, comprising: a pump housing, a pump rotor and a micro motor arranged in the pump housing, wherein the pump rotor comprises a cylindrical rotating shaft and blades; the blades are provided with a flexible portion and a hard portion along the radial direction of the cylindrical rotating shaft, and the flexible portion and the hard portion are integrally and smoothly connected; a clamping portion is provided at one end of the cylindrical rotating shaft, and a power output end of the micro motor is inserted into the clamping portion of the cylindrical rotating shaft to provide working power for the pump rotor;

[0007] A telescopic deformation portion and a state adjustment portion are provided in the pump housing; the telescopic deformation portion is used to accommodate the pump rotor, and the state adjustment portion controls the telescopic deformation portion to switch between a contracted state and an extended state; wherein, when the telescopic deformation portion is in the contracted state, a first accommodating space is provided therein; the flexible portion of the blades of the pump rotor is bent along the radial direction of the cylindrical shaft and is constrained in the first accommodating space; when the telescopic deformation portion is in the extended state, a second accommodating space is provided therein, the flexible portion of the blades of the pump rotor remains in an extended state, and the blades of the pump rotor can rotate in the second accommodating space.

[0008] As an implementation method, the flexible portion of the blade is arranged on the side close to the cylindrical shaft along the radial direction of the cylindrical shaft, and the hard portion is arranged on the side far from the cylindrical shaft along the radial direction of the cylindrical shaft; the flexible portion of the blade is fixed on the periphery of the cylindrical shaft so that the blade is distributed on the periphery of the cylindrical shaft.

[0009] As an implementation manner, the length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical shaft is 1:4 to 3:1.

[0010] As an implementation method, the flexible portion of the blade includes two or more material segments with different elastic moduli in sequence along the axial direction of the cylindrical shaft;

[0011] From the input side of the pumping object to the target direction, the elastic modulus of the material of the different material sections of the flexible portion of the blade changes from large to small.

[0012] As an implementation method, the flexible portion of the blade is arranged on the side far from the cylindrical shaft along the radial direction of the cylindrical shaft, and the hard portion is arranged on the side close to the cylindrical shaft along the radial direction of the cylindrical shaft; the hard portion of the blade is fixed on the periphery of the cylindrical shaft so that the blade is distributed on the periphery of the cylindrical shaft.

[0013] As an implementation manner, the length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical shaft is 1:4 to 4:1.

[0014] As an implementation manner, the elastic modulus of the material of the flexible portion of the blade is 8 MPa to 80 MPa.

[0015] As an implementation method, the telescopic deformation part includes an annular support body and a connector, the annular support body is formed by a metal rod or a metal wire in a continuous bending manner to form a closed loop; the connector is formed by a metal rod or a metal wire in a continuous bending manner, and the connector has 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 connector connects two adjacent annular support bodies along the axial direction of the annular support body; the first free end of the metal rod or the metal wire is connected to the bending portion of one of the two adjacent annular support bodies, and the second free end of the metal rod or the metal wire is connected to the bending portion of the other of the two adjacent annular support bodies.

[0016] As an implementation, the number of the blades is 1 to 6.

[0017] As an implementation method, when there is one blade, the blade is wound around the periphery of the other end of the cylindrical shaft in a manner of moving from the periphery of one end of the cylindrical shaft toward the other end of the cylindrical shaft; the number of times the blade is wound around the periphery of the cylindrical shaft is 0.2 to 5 times;

[0018] When there are 2 to 5 blades, the blades move from the equal divisions of the circumference of one end of the cylindrical shaft toward the other end of the cylindrical shaft, and each blade is arranged in parallel around the corresponding equal divisions of the circumference of the other end of the cylindrical shaft; the number of times the blades are arranged around the circumference of the cylindrical shaft is 0.1 to 5.

[0019] The embodiment of the present application also provides a cardiac catheter, which can be inserted into the ventricle of the heart along the human artery, and the blood pump is inserted in the catheter.

[0020] The pump rotor structure of the embodiment of the present application is that the blades of the pump rotor are made of flexible material along the radial part of the cylindrical rotating shaft, and the blades have a flexible part and a hard part, and the elastic modulus of the material of the flexible part is smaller than the elastic modulus of the material of the hard part. When the blood pump is inserted into the heart ventricle, the blades of the pump rotor are inserted into the telescopic deformation part of the pump housing, and the telescopic deformation part is put into a contracted state by the state adjustment part. The blades of the pump rotor are compressed and bent and deformed, so that the overall diameter of the pump rotor matches the inner diameter of the telescopic deformation part, and the overall outer diameter of the entire blood pump is thinned, so that it is easier to place it in the heart ventricle of the medical subject. After the blood pump is placed in the ventricle of the medical subject, the telescopic deformation part is put into an extended state by operating the state adjustment part, so that the blades of the pump rotor are restored from the deformed state to the normal state, and the pump rotor can operate normally in the telescopic deformation part to pump blood. Since the blade portion of the pump rotor in the embodiment of the present application adopts a flexible portion design, during the rotation of the pump rotor, the physiological indicators of the blood are less damaged and the red blood cells are almost not damaged. Therefore, the physiological indicators of the pumped blood can be guaranteed and it can be suitable for any medical subject, especially medical subjects with complications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a blood pump according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the pump rotor structure of an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the composition structure of the blades of the pump rotor of an embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the composition structure of the blades of the pump rotor of an embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the composition structure of the blades of the pump rotor of an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the composition structure of the blades of the pump rotor of an embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the application of a cardiac catheter according to an embodiment of the present application;

[0028] Figure 8 It is a structural schematic diagram of the telescopic deformation portion of the pump housing of an embodiment of the present application;

[0029] Fig. 9 It is a structural schematic diagram of the telescopic deformation portion of the pump housing of an embodiment of the present application;

[0030] Fig.10This is a schematic diagram of a blood pump application according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] The essence of the technical solution of the embodiment of the present application is explained in detail below with reference to the accompanying drawings.

[0032] Figure 1 FIG. 1 is a schematic diagram of the structure of the blood pump according to an embodiment of the present application. Figure 1 As shown, the blood pump of the embodiment of the present application includes: a pump housing 2, a pump rotor 1 and a micro motor arranged in the pump housing 2, the pump rotor 1 includes a cylindrical shaft 10 and blades 20; the blades 20 are divided into a flexible portion 201 and a hard portion 202 along the radial direction of the cylindrical shaft 10, and the flexible portion 201 and the hard portion 202 are integrally and smoothly connected; a clamping portion 101 is provided at one end of the cylindrical shaft 10, and a power output end 301 of the micro motor is inserted in the clamping portion 101 of the cylindrical shaft 10 to provide working power for the pump rotor 1; here, the power output end of the micro motor can be the shaft of the micro motor, which is inserted in the clamping portion 101 of the cylindrical shaft 10 and is clamped and fixedly connected with the clamping portion 101 of the cylindrical shaft 10, so as to drive the cylindrical shaft 10 to rotate, and the pump rotor 1 rotates to work and pump blood. As an implementation method, a straight or cross-shaped slot can be provided in the clamping portion 101, and the outermost end of the micro-motor shaft is correspondingly provided in a straight or cross shape, and the shaft of the micro-motor is inserted into the clamping portion 101 of the cylindrical shaft 10 to drive the cylindrical shaft 10 to rotate. Alternatively, a polygonal or circular slot is provided in the clamping portion 101, and the shaft of the micro-motor is provided in a corresponding shape and is interference-fitted with the slot of the clamping portion 101 to drive the cylindrical shaft 10 to rotate.

[0033] The pump housing 2 is provided with a telescopic deformation portion and a state adjustment portion; the telescopic deformation portion is used to accommodate the pump rotor 1, and the state adjustment portion controls the telescopic deformation portion to switch between a contracted state and an extended state; wherein, when the telescopic deformation portion is in the contracted state, a first accommodating space is provided therein; the flexible portion of the blade 20 of the pump rotor 1 is bent along the radial direction of the cylindrical shaft 10 and is constrained in the first accommodating space; when the telescopic deformation portion is in the extended state, a second accommodating space is provided therein, the flexible portion of the blade 20 of the pump rotor 1 remains in an extended state, and the blade 20 of the pump rotor 1 can rotate in the second accommodating space.

[0034] Figure 2 Schematic diagram of the pump rotor structure of the embodiment of the present application. Figure 2 As shown, the pump rotor of the embodiment of the present application includes: a cylindrical rotating shaft 10 and blades 20.

[0035] Figure 3 Schematic diagram of the composition structure of the blades of the pump rotor of the embodiment of the present application, Figure 4 Schematic diagram of the composition structure of the blades of the pump rotor of the embodiment of the present application, such as Figure 3 , Figure 4 As shown, the blade 20 has a flexible portion 201 and a hard portion 202 , and the flexible portion 201 and the hard portion 202 are smoothly connected as a whole; the flexible portion 201 of the blade 20 is fixed to the periphery of the cylindrical shaft 10 so that the blade 20 is distributed on the periphery of the cylindrical shaft 10 .

[0036] As another design structure of the blade with a flexible portion, refer to Figure 5 , Figure 6 Provide explanation. Figure 5 This is a schematic diagram of the pump rotor structure of an embodiment of the present application. Figure 6 Schematic diagram of the composition structure of the blades of the pump rotor of the embodiment of the present application, such as Figure 5 , Figure 6 As shown, in this example, the flexible portion 201 of the blade 20 is disposed above the hard portion 202 , and the hard portion 202 of the blade 20 is fixed to the periphery of the cylindrical shaft 10 so that the blade 20 is distributed on the periphery of the cylindrical shaft 10 .

[0037] In the embodiment of the present application, by setting the blade 20 to have a hard part 202 and a flexible part 201, when the pump rotor 1 rotates and drives the blade 20 to rotate, when the blade 20 comes into contact with the pumping object such as blood, the flexible part 201 is deformed under the force exerted by the pumping object. Therefore, when the pump rotor rotates at a high speed, since the texture of the flexible part 201 is relatively soft, it has a certain protective effect on the pumping object, and the blade causes less damage to the pumping object such as red blood cells in the blood. When the pumping object is pumped to the target direction, the physiological indicators of the pumping object such as blood will not be damaged.

[0038] Furthermore, when the pump rotor 1 is placed in the telescopic deformation part on the pump housing 2, the state adjustment part is used to put the telescopic deformation part in a contracted state, and the blades 20 of the pump rotor 1 are compressed and deformed, so that the overall diameter of the pump rotor 1 matches the inner diameter of the telescopic deformation part, and the overall outer diameter of the entire blood pump of the embodiment of the present application becomes thinner, so that it is easier to place it in the heart ventricle of the medical subject. After the blood pump is placed in the heart ventricle of the medical subject, the telescopic deformation part is put in an extended state by operating the state adjustment part, so that the blades 20 of the pump rotor 1 are restored from the deformed state to the normal state, and the pump rotor 1 can operate normally in the telescopic deformation part to pump blood.

[0039] In the embodiment of the present application, the flexible material used to make the flexible part 201 has certain elasticity requirements, and the material has certain elasticity and flexibility, wherein the elastic modulus of the material of the flexible part 201 is 8Mpa to 80Mpa; the elastic modulus of the material of the hard part 202 is 35Mpa to 195Mpa, and the elastic modulus of the material of the flexible part 201 is smaller than the elastic modulus of the material of the hard part 202.

[0040] In the embodiment of the present application, although the elastic modulus of the material selected for the flexible portion 201 is as small as possible, the bending deformation of the blades 20 of the pump rotor 1 with a small elastic modulus is larger, and it is easier to place it in the telescopic deformation part of the pump housing 2; however, in the embodiment of the present application, the pumping efficiency of the pump rotor 1 must also be considered. Therefore, under the premise of not causing damage to the physiological indicators of the pumping object such as blood, the pumping efficiency of the pump rotor 1 must be as high as possible. In the experiment process on the flexible material, the elastic modulus of the material of the flexible portion 201 is preferably 34.2Mpa to 39.1Mpa. When the flexible material is in the range of this elastic modulus, the damage to the physiological indicators of the pumping object such as blood is small, and the pumping efficiency of the pump rotor can be guaranteed. For example, when the above-mentioned flexible material with an elastic modulus of 36.7Mpa to 27.4Mpa is used, the pumping efficiency of the pump rotor of the embodiment of the present application can reach 84.8% of the pumping efficiency of the fully hard pump blades, and the pumping efficiency of the pump rotor does not decrease significantly. For the pumping object such as blood, there is almost no damage to the red blood cells in the sampling at the target direction end, and the occurrence of hemolysis is basically eliminated. In addition, no damage is observed to the white blood cell index, hemoglobin index, serum ligand protein index, platelet index, etc. in the blood on the target side. At the same time, the above-mentioned flexible part 201 adopts the above-mentioned flexible material with an elastic modulus, which can make the bending deformation of the pump rotor 1 meet the deformation requirements of the overall outer diameter of the blood pump.

[0041] In the embodiment of the present application, the material of the flexible part 201 has no rigidity requirement, and can be an alloy material that meets the elastic modulus requirement, or a resin, synthetic resin, mixed resin, etc. that meets the elastic modulus requirement. In the embodiment of the present application, the flexible material of the flexible part is preferably a resin material.

[0042] In the embodiment of the present application, there is no corresponding requirement for the material of the hard part 202, as long as the elastic modulus of the material of the hard part 202 is greater than the elastic modulus of the material of the flexible part 201. Under the condition of ensuring that the hard part 202 and the flexible part 201 are processed as one piece, the difference between the elastic modulus of the material of the hard part 202 and the elastic modulus of the material of the flexible part 201 is preferably 40Mpa to 60Mpa. In the embodiment of the present application, when the material of the flexible part 201 is resin, the material of the hard part 202 is preferably also selected from a resin or other similar material with higher hardness. When the material of the flexible part 201 is alloy, the material of the hard part 202 is preferably also selected from an alloy or metal with higher hardness.

[0043] In the embodiment of the present application, when the cylindrical shaft 10 rotates, the pumping object can apply a reaction thrust to the blade 20, and the flexible portion 201 of the blade 20 is deformed to cause the blade 20 to bend as a whole along the direction of the reaction thrust, and the pumping object is pumped to the target direction driven by the bent blade.

[0044] like Figures 3 to 6 As shown, 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 shaft 10 is 1:4 to 4:1. Those skilled in the art should understand that the larger the proportion of the flexible portion 201 in the blade 20 of the pump rotor 1, the greater the bending amount of the blade 20 will be, so that it is easier to place it in the telescopic deformation portion on the pump housing 2, and it is also more convenient when the blood pump is introduced into the ventricle of the medical subject. However, considering the pumping efficiency of the pump rotor 1, the blade 20 of the pump rotor 1 is also required to have a certain hardness to ensure normal pumping of the blood of the medical subject.

[0045] As a preferred method, Figure 3 , Figure 4 In the blade 20 structure shown, the ratio between the height of the flexible portion 201 at the lower end and the hard portion 202 at the upper end is between 1:4 and 2:1. As an implementation, the length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical shaft can also be 10:37, 9:26, 11:24, 4:7 or 11:14.

[0046] As a preferred method, Figure 3 , Figure 4 In the structure of the blade 20 shown, the flexible portion 201 of the blade 20 is composed of at least two sections of materials with different elastic moduli; from the input side of the pumping object to the target direction, the elastic moduli of the materials of the different material sections of the flexible portion 201 of the blade 20 decrease from large to small. As an implementation example, the flexible portion 201 of the blade 20 is composed of two sections of materials with different elastic moduli, or three sections of materials with different elastic moduli, or four sections of materials with different elastic moduli.

[0047] In the embodiment of the present application, the flexible portion 201 of the blade 20 is made of a flexible material with a different elastic modulus so that the blade 20 can form a corresponding deformation around the periphery of the cylindrical shaft 10, thereby forming a bending deformation of the pump blade, thereby improving the pumping efficiency of the pump rotor of the embodiment of the present application.

[0048] As a preferred method, Figure 5 , Figure 6 In the blade 20 structure shown, the ratio between the length of the flexible portion 201 in the radial direction of the cylindrical shaft 10 and the length of the hard portion 202 is between 1:3 and 1:1. As an implementation, the length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical shaft is 7:19, 10:29, 9:25, 3:11, 4:9 or 11:15.

[0049] In an embodiment of the present application, as an implementation method, the number of blades is 1 to 6.

[0050] like Figure 2 As shown, when there is one blade 20, the blade 20 is wound around the periphery of the other end of the cylindrical shaft 10 in a manner of moving from the periphery of one end of the cylindrical shaft 10 toward the other end of the cylindrical shaft 10; the number of times the blade 20 is wound around the periphery of the cylindrical shaft 10 is 0.2 to 5 times. When there is one blade 20, the number of times the blade 20 is wound around the periphery of the cylindrical shaft 10 is preferably more than one time.

[0051] It should be noted that, in the embodiment of the present application, although the blade 20 adopts the design of the flexible portion 201, the blade design in the pump rotor structure of the embodiment of the present application still needs to adopt the design principle of ordinary pump rotor blades, that is, it is necessary to set the pump input angle and output angle, etc. Since the design of pump rotor blades belongs to conventional technology, it is not the focus of discussion here. In the embodiment of the present application, by adopting the design of the blade 20 with a partial flexible portion, the input angle and output angle of the pump rotor blade can be partially replaced, that is, compared with the angle of the conventional pump rotor blade, it can be designed to be slightly smaller, so as to achieve the same effect as the design of the conventional pump rotor blade based on the deformation of the flexible portion 201 of the blade 20.

[0052] As an implementation method, in an embodiment of the present application, when the number of blades 20 of the pump rotor is 2 to 6, the blades 20 move from the equal divisions of the circumference of one end of the cylindrical shaft 10 toward the other end of the cylindrical shaft 10, and each blade 20 is arranged in parallel around the corresponding equal divisions of the circumference of the other end of the cylindrical shaft 10; the number of times the blades 20 are arranged around the circumference of the cylindrical shaft 10 is 0.1 to 5 times.

[0053] Figure 7 This is a schematic diagram of the application of the cardiac catheter in the embodiment of the present application, such as Figure 7 As shown, the blood pump is connected to the cardiac catheter. When the blood pump is placed in the ventricle of the heart, the pump rotor 1 together with its blades 20 are inserted into the telescopic deformation part of the pump housing 2 of the blood pump. The telescopic deformation part is put into a contracted state by the state adjustment part. The blades 20 of the pump rotor 1 are compressed and deformed, so that the overall diameter of the pump rotor 1 matches the inner diameter of the telescopic deformation part, and the overall outer diameter of the entire blood pump is thinned, so that it is easier to place it in the ventricle of the heart of the medical subject. After the blood pump is placed in the ventricle of the medical subject, the telescopic deformation part is put into an extended state by operating the state adjustment part, so that the blades of the pump rotor are restored from the deformed state to the normal state, and the pump rotor can operate normally in the telescopic deformation part to pump blood.

[0054] In addition, in the pump rotor structure of the embodiment of the present application, the blade portion of the pump rotor is made of a flexible material, so that when the pump rotor rotates, the blades of the pump rotor are deformed and bent, and the bent blades form pump rotor blades to pump blood to the target direction. In the embodiment of the present application, since the flexible portion of the blade is fixed to the periphery of the cylindrical shaft, it will be naturally deformed along the rotation direction by the reaction force of the pumping object when the rotor rotates, thereby forming the pump blades of the pump. In addition, since the blade portion of the pump rotor of the embodiment of the present application is made of a flexible material, during the rotation of the pump, the blades of the pump rotor will bend and deform when pumping blood, which is less destructive to the physiological indicators of the blood and almost does not damage the red blood cells. Therefore, the physiological indicators of pumping blood can be guaranteed, and it can be applicable to any medical object, especially medical objects with complications.

[0055] Figure 8 Schematic diagram of the structure of the telescopic deformation portion of the pump housing of the embodiment of the present application, Fig. 9 Schematic diagram of the structure of the telescopic deformation portion of the pump housing of the embodiment of the present application, as shown in Figure 8 , Fig. 9As shown, the telescopic deformation portion of the pump housing 2 of the embodiment of the present application includes an annular support body 203 and a connecting body 204, wherein the annular support body 203 is formed by a metal rod or a metal wire in a continuous bending manner to form a closed ring; the connecting body 204 is formed by a metal rod or a metal wire in a continuous bending manner, and the connecting body 204 has 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 support bodies 203 along the axial direction of the annular support body 203; the first free end 205 of the metal rod or the metal wire is connected to the bending portion 207 of one of the two adjacent annular support bodies 203, and the second free end 206 of the metal rod or the metal wire is connected to the bending portion 207 of the other of the two adjacent annular support bodies 203.

[0056] As an implementation method, the annular support body 203 is formed into a closed loop by continuously bending a metal rod or a metal wire in a roughly bow shape. The connecting body 204 is formed by continuously bending a metal rod or a metal wire in a roughly bow shape. In the embodiment of the present application, the material of the metal rod or metal wire forming the annular support body 203 can be a nickel-chromium alloy, and the diameter of the metal rod or metal wire is 0.02 to 0.5 mm. The material of the metal rod or metal wire forming the annular support body 203 can be an iron-nickel-chromium alloy, and the diameter of the metal rod or metal wire is 0.08 to 0.5 mm. In the embodiment of the present application, the overall hardness of the annular support body 203, the inner diameter size of the annular support body in the extended state, and the inner diameter size of the annular support body 203 in the contracted state can be adjusted by setting the interval and length of the continuous bending of the bow shape. The metal rod or metal wire forming the connector 204 may be made of an iron-nickel-chromium alloy, and the diameter of the metal rod or metal wire is 0.02 to 0.25 mm, that is, the metal rod or metal wire of the connector 204 may be set thinner to increase its flexibility.

[0057] Fig.10 This is a schematic diagram of the blood pump application of the embodiment of the present application, such as Fig.10 As shown, the following combination Figure 8 , Fig. 9 and Fig.10 The structure shown in the figure introduces how the blood pump of the embodiment of the present application is used. In the embodiment of the present application, Figure 8 , Fig. 9The pump housing shown is capable of contraction and expansion. When the blood pump of the embodiment of the present application needs to be inserted into the body of a medical subject, the blood pump of the present application can be set to a contracted state, that is, the pump rotor of the embodiment of the present application is placed in the accommodating space of the pump housing in a manner of bent blades. For example, the pump housing of the embodiment of the present application can be stretched at both ends so that the pump housing is deformed axially to form a thin tube shape, and the pump housing is kept in the thin tube shape by a support rod, and then the pump rotor is inserted into the thin tube-shaped pump housing, and the pump housing with the pump rotor inserted is connected to the insertion catheter 30, as shown. Figure 7 As shown, a catheter connected to a pump housing can be inserted into a human body through an arterial blood vessel of a medical subject, such as inserting a blood pump of an embodiment of the present application into a ventricle of a heart through a femoral artery of a thigh. After the pump housing in a capillary shape is inserted into the ventricle of a heart, the support rod that holds the pump housing in a capillary shape can be removed from the pump housing. In this way, since the pump housing is stretched under the support of the support rod before, after the support rod is removed, the pump housing is in a Figure 8 The hollow shape shown is arranged, and the metal rod or wire constituting the pump housing is elastic, that is, the pump housing has the ability to maintain its original shape. The pump housing begins to expand radially and shrinks and shortens in the axial direction and recovers to the state before stretching as much as possible. In this way, the accommodating space in the pump housing becomes larger, that is, the inner diameter of the pump housing becomes larger, and the length becomes shorter. The blades of the pump rotor are previously contracted in the pump housing due to bending. After the pump housing is restored, the blades of the pump rotor are also restored to a non-bent state. In the embodiment of the present application, after the pump housing is restored to its original state, the inner diameter of the pump housing is larger than the overall diameter of the pump rotor, even if the pump rotor can rotate in the pump housing without touching the outer wall of the pump housing. In the embodiment of the present application, when the pump housing is restored to its original state after the support rod is removed, although the pump housing is a hollow structure, it can support the blood vessels of the medical subject, so that there is enough space for the pump rotor to rotate in the pump housing, so that the pump rotor can rotate freely in the pump housing, so that the blood in the blood vessels or ventricles of the medical subject can be pumped to the destination along the pumping direction, ensuring the normal blood circulation of the medical subject.

[0058] 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 in the clamping portion 101 of the cylindrical shaft 10 of the pump rotor, such as keeping the center line of the cylindrical shaft of the pump rotor and the center line in the pump housing in a straight line as much as possible. In this way, it can be ensured that the pump rotor does not touch the inner wall of the pump housing when rotating, thereby ensuring the pumping efficiency of the pump rotor. In this example, the support rod provided on the pump housing is equivalent 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. As long as it can cover the pump rotor and form the blood pump function of the embodiment of the present application, it can be used as a related component of the embodiment of the present application, such as a pump housing.

[0059] As another implementation method, when the blood pump of the embodiment of the present application needs to be inserted into the body of a medical subject, the blood pump of the embodiment of the present application can be set to a contracted state, that is, the pump rotor of the embodiment of the present application is placed in the accommodating space of the pump housing in a manner of bent blades, such as the pump housing of the embodiment of the present application can be stretched at both ends so that the pump housing is deformed axially to form a thin tube shape, and then the pump rotor is inserted into the thin tube-shaped pump housing, and the pump housing with the pump rotor inserted is inserted into the hollow catheter 30, such as Figure 7 As shown, the hollow catheter 30 provided with the blood pump of the embodiment of the present application can be inserted into the human body through the arterial blood vessel of the medical subject, for example, the blood pump of the embodiment of the present application can be inserted into the ventricle of the heart through the femoral artery of the thigh, and when the hollow catheter 30 with the inserted blood pump is guided to the target site, such as the ventricle of the heart, the pump housing in the shape of a capillary body is pushed out of the hollow catheter 30. After the pump housing in the shape of a capillary body is pushed out of the hollow catheter 30, since the pump housing is made of Figure 8 The hollow shape shown is arranged, and the metal rod or wire constituting the pump housing is elastic, that is, the pump housing has the ability to maintain its original shape. The pump housing begins to expand radially and shrinks and shortens in the axial direction to restore to the state before stretching as much as possible. In this way, the accommodating space in the pump housing becomes larger, that is, the inner diameter of the pump housing becomes larger, and the length becomes shorter. The blades of the pump rotor are previously contracted in the pump housing due to bending. After the pump housing is restored, the blades of the pump rotor also return to a non-bent state. In the embodiment of the present application, after the pump housing is restored to its original state, the inner diameter of the pump housing is larger than the overall diameter of the pump rotor, even if the pump rotor can rotate in the pump housing without touching the outer wall of the pump housing. In the embodiment of the present application, when the pump housing is pushed out of the hollow catheter and restored to its original shape, although the pump housing is a hollow structure, it can support the blood vessels of the medical subject, so that the pump housing has enough space for the pump rotor to rotate, so that the pump rotor can rotate freely in the pump housing, so that the blood in the blood vessels or ventricles of the medical subject can be pumped to the destination along the pumping direction, ensuring the normal blood circulation of the medical subject.

[0060] 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 in the holding portion 101 of the cylindrical shaft 10 of the pump rotor, such as keeping the center line of the cylindrical shaft of the pump rotor and the center line in the pump housing in a straight line as much as possible. In this way, it can be ensured that the pump rotor does not touch the inner wall of the pump housing when rotating, thereby ensuring the pumping efficiency of the pump rotor. In this example, the hollow conduit contained in the pump housing is equivalent 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. As long as it can cover the pump rotor and form the blood pump function of the embodiment of the present application, it can be used as a related component of the embodiment of the present application, such as a pump housing.

[0061] The embodiment of the present application also describes a cardiac catheter, which can be inserted into the ventricle of the heart along the human artery, and the blood pump is inserted into the catheter. Figure 7 The blood pump adopts Figures 1 to 9 The blood pump structure shown.

[0062] The pump rotor structure of the embodiment of the present application is that the blades of the pump rotor are made of flexible material along the radial part of the cylindrical rotating shaft, and the blades have a flexible part and a hard part, and the elastic modulus of the material of the flexible part is smaller than the elastic modulus of the material of the hard part. When the blood pump is inserted into the heart ventricle, the blades of the pump rotor are inserted into the telescopic deformation part of the pump housing, and the telescopic deformation part is put into a contracted state by the state adjustment part. The blades of the pump rotor are compressed and bent and deformed, so that the overall diameter of the pump rotor matches the inner diameter of the telescopic deformation part, and the overall outer diameter of the entire blood pump is thinned, so that it is easier to place it in the heart ventricle of the medical subject. After the blood pump is placed in the ventricle of the medical subject, the telescopic deformation part is put into an extended state by operating the state adjustment part, so that the blades of the pump rotor are restored from the deformed state to the normal state, and the pump rotor can operate normally in the telescopic deformation part to pump blood. Since the blade portion of the pump rotor in the embodiment of the present application adopts a flexible portion design, during the rotation of the pump rotor, the physiological indicators of the blood are less damaged and the red blood cells are almost not damaged. Therefore, the physiological indicators of the pumped blood can be guaranteed and it can be suitable for any medical subject, especially medical subjects with complications.

[0063] Furthermore, the features and benefits of the present invention are described by reference to exemplary embodiments. Accordingly, the present invention should expressly not be limited to these exemplary embodiments illustrating some possible non-limiting combinations of features, which may exist alone or in other combinations of features.

[0064] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention shall be subject to the claims.

Claims

1. A blood pump, characterized in that: include: A pump housing, a pump rotor and a micro motor arranged in the pump housing, wherein the pump rotor comprises a cylindrical shaft and blades; the blades are provided with a flexible portion and a hard portion along the radial direction of the cylindrical shaft, and the flexible portion and the hard portion are integrally and smoothly connected; a clamping portion is provided at one end of the cylindrical shaft, and a power output end of the micro motor is inserted into the clamping portion of the cylindrical shaft to provide working power for the pump rotor; The pump housing is provided with a telescopic deformation part and a state adjustment part; the telescopic deformation part is used to accommodate the pump rotor, and the state adjustment part controls the telescopic deformation part to switch between a contracted state and an extended state; wherein, when the telescopic deformation part is in the contracted state, a first accommodating space is provided in the telescopic deformation part; the flexible part of the blade of the pump rotor is bent along the radial direction of the cylindrical shaft and is bound in the first accommodating space; when the telescopic deformation part is in the extended state, a second accommodating space is provided in the telescopic deformation part, the flexible part of the blade of the pump rotor remains in the extended state, and the blade of the pump rotor can rotate in the second accommodating space; The telescopic deformation part comprises an annular support body and a connector, wherein the annular support body is formed by a metal rod or a metal wire in a continuous bending manner to form a closed loop; the connector is formed by a metal rod or a metal wire in a continuous bending manner, and the connector has 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 connector connects two adjacent annular support bodies along the axial direction of the annular support body; the first free end of the metal rod or the metal wire is connected to the bending portion of one of the two adjacent annular support bodies, and the second free end of the metal rod or the metal wire is connected to the bending portion of the other of the two adjacent annular support bodies; The number of the blades is 1 to 6; When there is one blade, the blade is wound around the periphery of the other end of the cylindrical shaft in a manner of moving from the periphery of one end of the cylindrical shaft toward the other end of the cylindrical shaft; the number of times the blade is wound around the periphery of the cylindrical shaft is 0.2 to 5 times; When there are 2 to 5 blades, the blades move from the equal divisions of the circumference of one end of the cylindrical shaft toward the other end of the cylindrical shaft, and each blade is arranged in parallel around the corresponding equal divisions of the circumference of the other end of the cylindrical shaft; the number of times the blades are arranged around the circumference of the cylindrical shaft is 0.1 to 5.

2. The blood pump according to claim 1, characterized in that The flexible portion of the blade is arranged on the side close to the cylindrical shaft along the radial direction of the cylindrical shaft, and the hard portion is arranged on the side far from the cylindrical shaft along the radial direction of the cylindrical shaft; the flexible portion of the blade is fixed on the periphery of the cylindrical shaft so that the blade is distributed on the periphery of the cylindrical shaft.

3. The blood pump according to claim 2, characterized in that The length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical shaft is 1:4 to 3:

1.

4. The blood pump according to claim 2, characterized in that The flexible portion of the blade includes two or more material segments with different elastic moduli in sequence along the axial direction of the cylindrical shaft; From the input side of the pumping object to the target direction, the elastic modulus of the material of the different material sections of the flexible portion of the blade changes from large to small.

5. The blood pump according to claim 1, characterized in that The flexible portion of the blade is arranged at the side far from the cylindrical shaft along the radial direction of the cylindrical shaft, and the hard portion is arranged at the side close to the cylindrical shaft along the radial direction of the cylindrical shaft; the hard portion of the blade is fixed on the periphery of the cylindrical shaft so that the blade is distributed on the periphery of the cylindrical shaft.

6. The blood pump according to claim 5, characterized in that The length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical shaft is 1:4 to 4:

1.

7. The blood pump according to any one of claims 1 to 6, characterized in that The elastic modulus of the material of the flexible portion of the blade is 8 MPa to 80 MPa.

8. A cardiac catheter, which can be inserted into a ventricle of a heart along a human artery, wherein the blood pump according to any one of claims 1 to 7 is inserted into the catheter.

Images