Disclosure of Invention
Accordingly, an aspect of the embodiments of the present application provides a blood pump and a cardiac catheter, which can adjust the overall diameter of the blood pump, wherein when the blood pump is placed in a cardiac ventricle, the pump blades deform to reduce the diameter of the blood pump, and when the blood pump is placed in the cardiac ventricle, the blades of the blood pump return to a normal size, thereby ensuring the pumping efficiency of the blood pump.
The embodiment of the application provides a blood pump, which comprises a pump shell, a pump rotor and a miniature motor, wherein the pump rotor and the miniature motor are arranged in the pump shell, the pump rotor comprises a cylindrical rotating shaft and blades, the blades are respectively provided with a flexible part and a hard part along the radial direction of the cylindrical rotating shaft, and the flexible part and the hard part are integrally and smoothly connected;
The pump comprises a pump housing, a pump rotor, a state adjusting part, a flexible deformation part and a second accommodation space, wherein the flexible deformation part is arranged in the pump housing, the flexible deformation part is used for accommodating the pump rotor, the state adjusting part is used for controlling the flexible deformation part to switch between a contracted state and an expanded state, a first accommodation space is formed in the flexible deformation part when the flexible deformation part is in the contracted state, flexible parts of blades of the pump rotor are bent along the radial direction of a cylindrical rotating shaft and are bundled in the first accommodation space, a second accommodation space is formed in the flexible deformation part when the flexible deformation part is in the expanded state, the flexible parts of the blades of the pump rotor keep the expanded state, and the blades of the pump rotor can rotate in the second accommodation space.
As one implementation mode, the flexible part of the blade is arranged on the side close to the cylindrical rotating shaft along the radial direction of the cylindrical rotating shaft, the hard part is arranged on the side far away from the cylindrical rotating shaft along the radial direction of the cylindrical rotating shaft, and the flexible part of the blade is fixed on the periphery of the cylindrical rotating shaft so that the blade is distributed on the periphery of the cylindrical rotating shaft.
As one implementation, the length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical rotating shaft is 1:4 to 3:1.
As an implementation manner, the flexible part of the blade sequentially comprises more than two material sections with different elastic moduli along the axial direction of the cylindrical rotating shaft;
the elastic modulus of the material of the different material sections of the flexible part of the blade is changed from large to small from the input side of the pumping object to the target direction.
As one implementation mode, the flexible part of the blade is arranged on the far side of the cylindrical rotating shaft along the radial direction of the cylindrical rotating shaft, the hard part is arranged on the near side of the cylindrical rotating shaft along the radial direction of the cylindrical rotating shaft, and the hard part of the blade is fixed on the periphery of the cylindrical rotating shaft so that the blade is distributed on the periphery of the cylindrical rotating shaft.
As one implementation, the length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical rotating shaft is 1:4 to 4:1.
As one implementation, the elastic modulus of the material of the flexible portion of the blade is 8Mpa to 80Mpa.
The telescopic deformation part comprises an annular supporting body and a connecting body, wherein the annular supporting body is formed by continuously bending a metal rod or a metal wire, the connecting body is formed by continuously bending a metal rod or a metal wire and 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 body, the first free end of the metal rod or the metal wire is connected with the bending part of one annular supporting body of the two adjacent annular supporting bodies, and the second free end of the metal rod or the metal wire is connected with the bending part of the other annular supporting body of the two adjacent annular supporting bodies.
As one implementation, the blade is 1to 6 pieces.
When the number of the blades is 1, the blades are wound on the periphery of the other end of the cylindrical rotating shaft in a mode of moving towards the other end of the cylindrical rotating shaft from the periphery of one end of the cylindrical rotating shaft, and the number of the blades wound on the periphery of the cylindrical rotating shaft is 0.2 to 5 weeks;
when the number of the blades is 2 to 5, the blades move from the equal parts at the periphery of one end of the cylindrical rotating shaft to the other end of the cylindrical rotating shaft, each blade is wound at the corresponding equal parts at the periphery of the other end of the cylindrical rotating shaft in a parallel mode, and the number of the circumferences of the blades wound around the periphery of the cylindrical rotating shaft is 0.1 to 5 weeks.
The embodiment of the application also provides a cardiac catheter which can be inserted into a ventricle of a heart along an artery of a human body, and the blood pump is inserted into the catheter.
According to the pump rotor structure provided by the embodiment of the application, the blades of the pump rotor are made of flexible materials along the radial part of the cylindrical rotating shaft, the blades are provided with the flexible parts and the hard parts, and the elastic modulus of the materials of the flexible parts is smaller than that of the materials of the hard parts. 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, the telescopic deformation part is in a contracted state through the state adjusting part, and the blades of the pump rotor are pressed to have bending deformation, so that the whole diameter of the pump rotor is matched with the inner diameter of the telescopic deformation part, the whole outer diameter of the whole blood pump is thinned, and the blood pump is easier to place when placed into the heart ventricle of a medical object. After the blood pump is placed in the ventricle of the medical object, the expansion deformation part is in an extending state through the operation state adjusting part, so that the blades of the pump rotor are restored to a normal state from the deformation state, and the pump rotor can normally operate in the expansion deformation part to pump blood. Because the vane part of the pump rotor in the embodiment of the application adopts the design of the flexible part, the damage to the physiological index of blood is small in the rotation process of the pump rotor, and red blood cells are hardly damaged, so that the physiological index of pumped blood can be ensured, and the pump rotor is applicable to any medical object, in particular to medical objects with complications.
Detailed Description
The following describes the technical scheme of the embodiment of the present application in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a blood pump according to an embodiment of the present application, as shown in fig. 1, the blood pump according to an embodiment of the present application includes a pump housing 2, a pump rotor 1 and a micro motor, wherein the pump rotor 1 is disposed in the pump housing 2, the pump rotor 1 includes a cylindrical rotating shaft 10 and a vane 20, the vane 20 is provided with a flexible portion 201 and a hard portion 202 along a radial direction of the cylindrical rotating shaft 10, the flexible portion 201 and the hard portion 202 are integrally and smoothly connected, one end of the cylindrical rotating shaft 10 is provided with a clamping portion 101, and a power output end 301 of the micro motor is inserted into the clamping portion 101 of the cylindrical rotating shaft 10 to provide working power for the pump rotor 1, and here, the power output end of the micro motor may be a rotating shaft of the micro motor, and is fixedly clamped and connected with the clamping portion 101 of the cylindrical rotating shaft 10 through being inserted into the clamping portion 101 of the cylindrical rotating shaft 10, so as to drive the cylindrical rotating shaft 10 to rotate, thereby perform the pumping of blood. As an implementation manner, for example, a linear or cross-shaped clamping groove may be provided in the clamping portion 101, and the outermost end of the rotating shaft of the micro-motor is correspondingly provided in a linear or cross-shaped manner, so that the rotating shaft of the micro-motor is inserted into the clamping portion 101 of the cylindrical rotating shaft 10 to drive the cylindrical rotating shaft 10 to rotate. Or a polygonal or circular groove is arranged 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 so as to drive the cylindrical rotating shaft 10 to rotate.
The pump casing 2 is provided with a telescopic deformation part and a state adjusting part, the telescopic deformation part is used for accommodating the pump rotor 1, the state adjusting part is used for controlling the telescopic deformation part to switch between a contracted state and an expanded state, a first accommodating space is formed in the telescopic deformation part when the telescopic deformation part is in the contracted state, the flexible parts of the blades 20 of the pump rotor 1 are bent along the radial direction of the cylindrical rotating shaft 10 and are bundled in the first accommodating space, a second accommodating space is formed in the telescopic deformation part when the telescopic deformation part is in the expanded state, the flexible parts of the blades 20 of the pump rotor 1 keep the expanded state, and the blades 20 of the pump rotor 1 can rotate in the second accommodating space.
Fig. 2 is a schematic view showing the constitution of a pump rotor according to an embodiment of the present application, and as shown in fig. 2, the pump rotor according to an embodiment of the present application includes a cylindrical rotating shaft 10 and blades 20.
Fig. 3 is a schematic view of the composition of the vane of the pump rotor according to the embodiment of the present application, and fig. 4 is a schematic view of the composition of the vane of the pump rotor according to the 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, the flexible portion 201 and the hard portion 202 are integrally and smoothly connected, and 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.
As another design structure of the blade having the flexible portion, description will be made with reference to fig. 5 and 6. Fig. 5 is a schematic view of a pump rotor assembly structure according to an embodiment of the present application, and fig. 6 is a schematic view of a vane assembly structure of a pump rotor according to an embodiment of the present application, as shown in fig. 5 and 6, in this example, the flexible portion 201 of the vane 20 is disposed above the hard portion 202, and the hard portion 202 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.
In the embodiment of the application, by setting the vane 20 as the hard part 202 and the flexible part 201, when the pump rotor 1 rotates to drive the vane 20 to rotate, the flexible part 201 deforms under the acting force exerted by the pumping object after the vane 20 contacts with the pumping object such as blood, so that under the condition that the pump rotor rotates at a high speed, the vane has a certain protection effect on the pumping object due to the softer texture of the flexible part 201, and the vane has less damage to the pumping object such as red blood cells in blood, and the physiological index of the pumping object such as blood is not damaged when the pumping object is pumped to the target direction.
When the pump rotor 1 is placed in the expansion and contraction deformation portion on the pump housing 2, the expansion and contraction deformation portion is in 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 overall diameter of the pump rotor 1 is matched with the inner diameter of the expansion and contraction deformation portion, and the overall outer diameter of the whole blood pump in the embodiment of the application is thinned, so that the blood pump is easier to place when being placed in the heart ventricle of a medical object. After the blood pump is placed in the ventricle of the medical subject, the expansion/contraction deformation portion is placed in an extended state by the operation state adjustment portion, so that the blades 20 of the pump rotor 1 are returned from the deformed state to the normal state, and the pump rotor 1 can be normally operated in the expansion/contraction deformation portion to pump blood.
In the embodiment of the present application, the flexible material for making 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 for making the flexible portion 201 is 8Mpa to 80Mpa, the elastic modulus of the material for making the hard portion 202 is 35Mpa to 195Mpa, and the elastic modulus of the material for making the flexible portion 201 is smaller than the elastic modulus of the material for making the hard portion 202.
In the embodiment of the present application, the smaller the elastic modulus of the material is, the better the material is selected, the larger the bending deformation amount of the vane 20 of the pump rotor 1 with smaller elastic modulus is, and the pump rotor 1 is easier to be placed in the expansion deformation portion of the pump housing 2, but in the embodiment of the present application, the pumping efficiency of the pump rotor 1 is considered, so that the pumping efficiency of the pump rotor 1 is ensured to be as high as possible on the premise of not damaging the physiological index of the pumping object such as blood. In the experimental process for 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 the section of the elastic modulus, the damage to the physiological index 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 can reach 84.8% of the pumping efficiency of the pump blade with full hardness, the pumping efficiency of the pump rotor is not obviously reduced, and for a pumping object such as blood to be pumped, in sampling of a target direction end, the damage of red blood cells is hardly seen, and the hemolysis is basically prevented. In addition, the target-side blood has no damage to the leukocyte index, hemoglobin index, serum-binding globin index, platelet index, and the like. Meanwhile, the flexible portion 201 is made of the flexible material having the elastic modulus, so that the bending deformation amount 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 required to have hardness, and may be an alloy material that satisfies the above-mentioned elastic modulus requirement, or a material such as a resin, a synthetic resin, or a mixed resin that satisfies the above-mentioned elastic modulus requirement. In the embodiment of the present application, the flexible material of the flexible portion is preferably a resin material.
In the embodiment of the present application, there is no corresponding requirement on the material of the hard portion 202, as long as the elastic modulus of the material of the hard portion 202 is greater than the elastic modulus of 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 a resin with higher hardness. When the material of the flexible portion 201 is an alloy, the material of the hard portion 202 is preferably an alloy or a metal having a higher hardness.
In this embodiment of the present application, when the cylindrical rotating shaft 10 rotates, the pumping object can apply a reaction thrust to the blade 20, and the flexible portion 201 of the blade 20 deforms to bend the whole blade 20 along the reaction thrust direction, so that the pumping object is pumped to the 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 appreciated by those skilled in the art that the larger the ratio of the flexible portion 201 in the blades 20 of the pump rotor 1, the larger the amount of bending of the blades 20, and thus the easier it is to place it in the elastically deformed portion of the pump housing 2, and the more convenient it is to introduce the blood pump into the ventricle of the subject, but in view of the pumping efficiency of the pump rotor 1, it is also necessary that the blades 20 of the pump rotor 1 have a certain stiffness to ensure the normal pumping of the blood of the subject.
In a preferred embodiment, in the blade 20 structure shown in fig. 3 and 4, 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 rotating shaft may be 10:37, 9:26, 11:24, 4:7 or 11:14.
In a preferable embodiment, in the vane 20 structure shown in fig. 3 and 4, the flexible portion 201 of the vane 20 is made of at least two materials having different elastic moduli, and the elastic modulus of the materials of the different material segments of the flexible portion 201 of the vane 20 is reduced from large to small from the input side of the pumping object to the target direction. As an implementation example, the flexible portion 201 of the blade 20 is made of two materials with different elastic moduli, or three materials with different elastic moduli, or four 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 form corresponding deformation around the periphery of the cylindrical rotating shaft 10, thereby forming bending deformation of the pump vane, and improving the pumping efficiency of the pump rotor in the embodiment of the present application.
In a preferred manner, in the vane 20 structure shown in fig. 5 and 6, the ratio of the length of the flexible portion 201 in the radial direction of the cylindrical rotating shaft 10 to the hard portion 202 is between 1:3 and 1:1. As one implementation, the length ratio of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical rotating shaft is 7:19, 10:29, 9:25, 3:11, 4:9 or 11:15.
In the embodiment of the 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 circumference of the other end of the cylindrical rotating shaft 10 in a manner of moving from the circumference of the one end of the cylindrical rotating shaft 10 to the other end of the cylindrical rotating shaft 10, and the number of the circumferences of the blades 20 around the circumference of the cylindrical rotating shaft 10 is 0.2 to 5 weeks. When the number of the blades 20 is 1, the number of the blades 20 around the circumference of the cylindrical rotating shaft 10 is preferably more than one.
It should be noted that, in the embodiment of the present application, although the vane 20 adopts the design manner of the flexible portion 201, the vane design in the pump rotor structure of the embodiment of the present application still needs to adopt the design principle of the common pump rotor vane, that is, the pump input angle, the pump output angle, and the like need to be set. Since the design of pump rotor blades is conventional, no discussion is focused here. According to the embodiment of the application, the blade 20 adopts the design of a part of the flexible part, so that the input angle and the output angle of the blade of the pump rotor can be partially replaced, namely, compared with the angle of the conventional pump rotor blade, the blade can be slightly designed to be smaller, and the effect which is exactly the same as that of the blade of the conventional pump rotor can be achieved based on the deformation of the flexible part 201 of the blade 20.
As one implementation, in the embodiment of the present application, when the blades 20 of the pump rotor are 2 to 6, the blades 20 move from the equal parts at the periphery of one end of the cylindrical rotating shaft 10 to the other end of the cylindrical rotating shaft 10, each blade 20 is wound around the corresponding equal parts at the periphery of the other end of the cylindrical rotating shaft 10 in a parallel manner, and the number of the circumferences of the blades 20 around the periphery of the cylindrical rotating shaft 10 is 0.1 to 5 weeks.
Fig. 7 is a schematic diagram of an application of the cardiac catheter according to the embodiment of the present application, as shown in fig. 7, 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 and the blades 20 thereof are inserted into the expansion and contraction deformation portion of the pump housing 2 of the blood pump, the expansion and contraction deformation portion is in a contracted state by the state adjustment portion, and the blades 20 of the pump rotor 1 are pressed to have bending deformation, so that the overall diameter of the pump rotor 1 is matched with the inner diameter of the expansion and contraction deformation portion, and the overall outer diameter of the whole blood pump is thinned, so that the blood pump is easier to place when being 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 expansion deformation part is in an extending state through the operation state adjusting part, so that the blades of the pump rotor are restored to a normal state from the deformation state, and the pump rotor can normally operate in the expansion deformation part to pump blood.
In addition, in the pump rotor structure of the embodiment of the application, the vane part of the pump rotor is made of flexible materials, so that when the pump rotor rotates, the vanes of the pump rotor deform and bend, and the bent vanes form the pump rotor vanes to pump blood to a target direction. In the embodiment of the application, the flexible part of the blade is fixed on the periphery of the cylindrical rotating shaft, so that the peripheral edge of the blade is naturally deformed by the reaction force of the pumping object along the rotating direction when the rotor rotates, thereby forming the pump blade of the pump. In addition, the vane part of the pump rotor is made of flexible materials, so that the vanes of the pump rotor are bent and deformed when pumping blood in the rotation process of the pump, 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 is suitable for any medical object, particularly medical objects with complications.
Fig. 8 is a schematic structural view of a telescopic deformation portion of a pump housing according to an embodiment of the present application, and fig. 9 is a schematic structural view of a telescopic deformation portion of a pump housing according to an embodiment of the present application, as shown in fig. 8 and 9, the telescopic deformation portion of a pump housing 2 according to an embodiment of the present application includes an annular support body 203 and a connecting body 204, the annular support body 203 is formed by continuously bending a metal rod or a metal wire, the connecting body 204 has a metal rod or a metal wire first free end 205 and a metal rod or a metal wire second free end 206, the connecting body 204 connects two adjacent annular support bodies 203 along an axial direction of the annular support bodies 203, the metal rod or the metal wire first free end 205 is connected with a bending portion 207 of one annular support body 203 of the two adjacent annular support bodies 203, and the metal rod or the metal wire second free end 206 is connected with a bending portion 207 of the other annular support body 203 of the two adjacent annular support bodies 203.
As one implementation, the annular supporting body 203 is formed into a closed loop by a metal rod or wire in a substantially arcuate continuous bending manner. The connector 204 is formed of a metal rod or wire in a generally arcuate shape in a continuous bent manner. In the embodiment of the present application, the metal rod or wire forming the annular supporting body 203 may be nichrome, and the diameter of the metal rod or wire is 0.02 to 0.5mm. The metal rod or wire forming the annular support 203 may be iron-nickel-chromium alloy, and the diameter of the metal rod or wire may be 0.08 to 0.5mm. In the embodiment of the present application, the overall hardness of the annular support 203 can be adjusted by setting the interval and the length of the continuous bending of the arch, the inner diameter dimension of the annular support in the extended state, and the inner diameter dimension of the annular support 203 in the contracted state. The metal rod or wire forming the connector 204 may be iron-nickel-chromium alloy, and the diameter of the metal rod or wire may be 0.02 to 0.25mm, i.e. the metal rod or wire of the connector 204 may be thinner to increase flexibility.
Fig. 10 is a schematic diagram of an application of the blood pump according to the embodiment of the present application, as shown in fig. 10, and in the following, with reference to the structures shown in fig. 8, 9 and 10, how the blood pump according to the embodiment of the present application is used will be described. In the embodiment of the present application, the pump housing shown in fig. 8 and 9 is capable of being contracted and expanded, when the blood pump of the embodiment of the present application needs to be placed in the body of a medical object, the blood pump of the present application may be set in 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 vane bending manner, for example, the pump housing of the embodiment of the present application may be held at both ends to be stretched so as to deform the pump housing in the axial direction to form a tubule shape, the pump housing is held in the tubule shape by a support rod, the pump rotor is then inserted into the tubule-shaped pump housing, the pump housing with the pump rotor inserted therein is connected with the insertion catheter 30, as shown in fig. 7, the catheter connected with the pump housing may be inserted into the body through an arterial vessel of the medical object, for example, the blood pump of the embodiment of the present application may be inserted into the ventricle of the heart through femoral artery, when the pump housing in the form of a thin tube is inserted into the ventricle of the heart, the support rod in the form of a thin tube can be removed from the pump housing, so that the pump housing is stretched under the support of the support rod before being removed, and when the support rod is removed, the pump housing is provided in the hollow form as shown in fig. 8, and the metal rod or the metal wire constituting the pump housing has elasticity, that is, the pump housing has the capability of being kept in the original state, the pump housing begins to expand in the radial direction and contracts in the axial direction to be shortened and is restored to the state before being stretched as much as possible, so that the accommodating space in the pump housing is enlarged, that is, the inner diameter of the pump housing is enlarged, the length is shortened, the blades of the pump rotor are contracted in the pump housing before being bent, the blades of the pump rotor are restored to the non-bent state after the pump housing is restored, in the embodiment of the application, after the pump housing is set to return to the original state, the inner diameter of the pump housing is larger than the whole 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 application, after the pump housing is restored to the original state by removing the support rod, the pump housing has a hollow structure, but can form support for the blood vessel of the medical object, etc., so that enough space for the pump rotor to rotate is reserved in the pump housing, and the pump rotor can freely rotate in the pump housing, thereby pumping the blood in the blood vessel or the ventricle of the medical object to a destination along the pumping direction and ensuring the normal blood circulation of the medical object.
In the embodiment of the application, the position of the pump rotor in the pump shell can be kept through the power output end of the micro motor inserted into the clamping part 101 of the cylindrical rotating shaft 10 of the pump rotor, for example, the center line of the cylindrical rotating shaft of the pump rotor and the center line in the pump shell are kept on the same straight line as far as possible, so that the pump rotor is prevented from touching the inner wall of the pump shell when rotating, and the pumping efficiency of the pump rotor is ensured. In this example, the support rod provided in the pump housing corresponds to the state adjusting 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 as long as the components forming the blood pump function of the embodiment of the present application can cover the pump rotor, the components can be used as the relevant components of the embodiment of the present application, such as the pump housing.
As another implementation, when the blood pump of the embodiment of the present application needs to be placed in the body of the medical object, the blood pump of the embodiment of the present application may be set in 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 bending the blades, for example, the pump housing of the embodiment of the present application may be kept stretched at both ends to deform the pump housing in the axial direction to form a tubule shape, then the pump rotor is inserted in the tubule-shaped pump housing, the pump housing with the pump rotor inserted therein is inserted in the hollow catheter 30, as shown in fig. 7, the hollow catheter 30 provided with the blood pump of the embodiment of the present application may be inserted in the body through an arterial vessel of the medical object, for example, the blood pump of the embodiment of the present application may be inserted in the ventricle of the heart through femoral artery, when the hollow tube 30 with the blood pump inserted therein is guided into a heart chamber of a heart, the pump housing with the thin tube shape is pushed out of the hollow tube 30, and the pump housing is provided with the hollow shape shown in fig. 8, and the metal rod or the metal wire constituting the pump housing has elasticity, that is, the pump housing has the capability of keeping the original shape, the pump housing starts to expand in the radial direction and contracts and shortens in the axial direction so as to restore to the state before stretching as much as possible, thus the containing space in the pump housing is enlarged, that is, the inner diameter of the pump housing is enlarged, and the length is shortened, the blades of the pump rotor are contracted in the pump housing due to bending before the blades of the pump rotor are restored to the non-bending state after the pump housing is restored, even though the pump rotor is able to rotate within the pump housing without touching the outer wall of the pump housing. In the embodiment of the application, after the pump housing is pushed out of the hollow catheter and returns to the original state, the pump housing has a hollow structure, but can form support for the blood vessel of a medical object and the like, so that enough space for the pump rotor to rotate is reserved in the pump housing, and the pump rotor can freely rotate in the pump housing, thereby pumping the blood in the blood vessel or the ventricle of the medical object to a destination along the pumping direction and ensuring the normal blood circulation of the medical object.
In the embodiment of the application, the position of the pump rotor in the pump shell can be kept through the power output end of the micro motor inserted into the clamping part 101 of the cylindrical rotating shaft 10 of the pump rotor, for example, the center line of the cylindrical rotating shaft of the pump rotor and the center line in the pump shell are kept on the same straight line as far as possible, so that the pump rotor is prevented from touching the inner wall of the pump shell when rotating, and the pumping efficiency of the pump rotor is ensured. In this example, the hollow duct placed in the pump housing corresponds to the state adjusting 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 as long as the components forming the blood pump function of the embodiment of the present application can cover the pump rotor, the components can be used as the relevant components of the embodiment of the present application, such as the pump housing.
The embodiment of the application also discloses a cardiac catheter which can be inserted into a ventricle of a heart along an artery of a human body, and the blood pump is inserted into the catheter. The cardiac catheter structure of an embodiment of the present application may refer to the structure shown in fig. 7. The blood pump adopts the blood pump structure shown in fig. 1 to 9.
According to the pump rotor structure provided by the embodiment of the application, the blades of the pump rotor are made of flexible materials along the radial part of the cylindrical rotating shaft, the blades are provided with the flexible parts and the hard parts, and the elastic modulus of the materials of the flexible parts is smaller than that of the materials of the hard parts. 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, the telescopic deformation part is in a contracted state through the state adjusting part, and the blades of the pump rotor are pressed to have bending deformation, so that the whole diameter of the pump rotor is matched with the inner diameter of the telescopic deformation part, the whole outer diameter of the whole blood pump is thinned, and the blood pump is easier to place when placed into the heart ventricle of a medical object. After the blood pump is placed in the ventricle of the medical object, the expansion deformation part is in an extending state through the operation state adjusting part, so that the blades of the pump rotor are restored to a normal state from the deformation state, and the pump rotor can normally operate in the expansion deformation part to pump blood. Because the vane part of the pump rotor in the embodiment of the application adopts the design of the flexible part, the damage to the physiological index of blood is small in the rotation process of the pump rotor, and red blood cells are hardly damaged, so that the physiological index of pumped blood can be ensured, and the pump rotor is applicable to any medical object, in particular to medical objects with complications.
Furthermore, the features and benefits of the present invention are described with reference to the exemplary embodiments. Accordingly, the invention is expressly not limited to the exemplary embodiments which illustrate some possible non-limiting combinations 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 application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.