Pumping catheter assembly and cardiac blood flow assisting system

Abstract

The invention provides a blood pumping catheter assembly and a heart blood flow assisting system.The blood pumping catheter assembly comprises a sheath tube, a first shaft sleeve, a pump unit and a driving part, the first shaft sleeve is rotatably connected to the sheath tube, and the near end part of a rotating shaft in the pump unit is supported in the first shaft sleeve; the two ends, in the axial direction of the rotating shaft, of the blade with the deformation structure are connected to the far-end part of the rotating shaft and the first shaft sleeve correspondingly, and the driving piece can drive the rotating shaft to rotate and can also drive the rotating shaft to move in the axial direction of the driving piece. The driving piece can drive the rotating shaft and the blades to rotate, and blood pumping is achieved; the rotating shaft or the first shaft sleeve can be driven to move in the axial direction, so that the blades comprising the deformation structures can be close to or far away from each other along the two ends in the axial direction of the rotating shaft, the blades elastically deform, and the sizes of the blades in the radial direction of the rotating shaft can be increased or decreased; the blood pumping catheter assembly can intervene in the human body with the small radial size.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly relates to a blood pumping catheter assembly and a cardiac blood flow assistance system. Background Art

[0002] The heart is an important organ that provides power for the blood circulation of the human body. The cardiac output is an important indicator to measure the strength and normality of the heart's ejection function.

[0003] For some patients suffering from heart diseases such as heart failure, the cardiac output of the heart is difficult to meet the body's needs, posing a great threat to physical health. Using a blood pumping catheter as a way to increase the cardiac output has become an important auxiliary device for patients with heart diseases during the treatment process.

[0004] The blood pumping catheter usually intervenes in the corresponding target blood vessel or blood transfusion organ of the human body through a percutaneous operation. In order to reduce the harm caused by the intervention, the intervention size of the blood pumping catheter needs to be as small as possible. How to reduce the intervention size of the blood pumping catheter has always been the focus of research by those skilled in the art. Summary of the Invention

[0005] In view of the above problems, the present application provides a blood pumping catheter assembly and a cardiac blood flow assistance system, and the blood pumping catheter assembly has a small intervention size.

[0006] In a first aspect, some embodiments of the present application provide a blood pumping catheter assembly, which includes a sheath, a first bushing, a pump unit, and a driving member located in the sheath. The first bushing is connected to the sheath. The pump unit includes a rotating shaft and blades. The proximal part of the rotating shaft is supported in the first bushing. The blades include a deformable structure. One end of the blades along the axial direction of the rotating shaft is connected to the distal part of the rotating shaft, and one end of the blades is connected to the first bushing. The driving member is configured to be able to drive the rotating shaft to rotate; the driving member can drive the rotating shaft or the first bushing to move axially along its own axis, so that the two ends of the blades in the axial direction are close to or away from each other, so that the radial dimension of the blades increases or decreases.

[0007] In the above structure, the driving member can not only drive the rotating shaft and the blades to rotate to realize the pumping of blood, but also drive the rotating shaft or the first bushing to move axially along its own axis. In this embodiment, since one end of the blades is fixed to the first bushing and the other end can axially move relative to the first bushing along with the rotating shaft, during the axial movement of the rotating shaft or the first bushing, the two ends of the blades including the deformable structure along the axial direction of the rotating shaft can be close to or away from each other, and the blades undergo elastic deformation, so that the radial dimension of the blades on the rotating shaft can increase or decrease, enabling the blood pumping catheter assembly to intervene in the human body with a small radial dimension.

[0008] According to the blood pumping catheter assembly provided by some embodiments of the present application, the driving member includes a driving shaft, the driving shaft is capable of driving the rotating shaft to axially move towards the first sleeve, and the blood pumping catheter assembly further includes a positioning assembly, the positioning assembly includes a clamping member, the first sleeve is provided with a first shaft hole, the rotating shaft is slidably connected to the first shaft hole, the clamping member is connected to the rotating shaft and at least partially located in the first shaft hole, and the clamping member is capable of clamping with the first sleeve.

[0009] According to the blood pumping catheter assembly provided by some embodiments of the present application, the positioning assembly further includes a first elastic structure, the first elastic structure is located in the first shaft hole and its two ends are respectively connected to the inner wall of the first shaft hole and the rotating shaft, in a state where the clamping member is disengaged from the first sleeve, the first elastic structure is capable of resetting the rotating shaft through elastic force.

[0010] According to the blood pumping catheter assembly provided by some embodiments of the present application, the clamping member includes a connecting portion and a clamping head connected to each other, the connecting portion is connected between the clamping head and the rotating shaft, the clamping head is provided with a resisting surface, and the resisting surface is capable of resisting against the end face of the first sleeve.

[0011] According to the blood pumping catheter assembly provided by some embodiments of the present application, the driving member further includes a moving tube located in the sheath tube, the moving tube is provided with a through hole, the driving shaft passes through the through hole, the clamping head is provided with a conical surface, and the moving tube is capable of acting on the conical surface to disengage the clamping head from the first sleeve.

[0012] According to the blood pumping catheter assembly provided by some embodiments of the present application, the driving member further includes a driving portion located in the sheath tube, and the driving portion is configured to be capable of pushing the first sleeve towards the distal end of the rotating shaft.

[0013] According to the blood pumping catheter assembly provided by some embodiments of the present application, two protruding portions are sequentially provided on the outer peripheral surface of the first sleeve, and a groove is formed between the two protruding portions; a first fixed sleeve is provided on the sheath tube, the first fixed sleeve is sleeved on the outer peripheral surface of the first sleeve, and the first fixed sleeve is located in the groove, and the first fixed sleeve can limit the first sleeve axially.

[0014] According to the blood pumping catheter assembly provided by some embodiments of the present application, the first sleeve has a distal position and a proximal position relative to the rotating shaft, and the driving member is configured such that: when the first sleeve is located at the distal position, the driving portion abuts against the first sleeve.

[0015] According to the blood pumping catheter assembly provided by some embodiments of the present application, the deformable structure is an elastic structure.

[0016] According to the blood pumping catheter assembly provided by some embodiments of the present application, the blade includes a framework and a film provided on the framework, the two axial ends of the framework are respectively connected to the rotating shaft and the first sleeve, and the framework is configured to arch radially along the rotating shaft.

[0017] According to the blood pumping catheter assembly provided by some embodiments of the present application, the blood pumping catheter assembly further includes a tail assembly, and the tail assembly includes a tail piece and a second bushing. The second bushing is rotatably connected to the tail piece, and the second bushing is provided with a second shaft hole, and the rotating shaft passes through the second shaft hole.

[0018] According to the blood pumping catheter assembly provided by some embodiments of the present application, a second protrusion is provided on the outer periphery of the second bushing, and the tail assembly includes a second elastic structure. The two ends of the second elastic structure are respectively connected to the tail piece and the second bushing, and the second elastic structure makes the second protrusion abut against the tail piece.

[0019] In a second aspect, some embodiments of the present application further provide a cardiac blood flow assistance system, and the cardiac blood flow assistance system includes the blood pumping catheter assembly provided by any of the above technical solutions.

[0020] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects:

[0021] The present application provides a blood pumping catheter assembly, and the blood pumping catheter assembly includes a sheath, a first bushing, a pump unit, and a driving member. The first bushing is connected to the sheath, the proximal part of the rotating shaft in the pump unit is supported in the first bushing, and the rotating shaft and the first bushing can move relative to each other; one end of a blade with a deformable structure is connected to the rotating shaft, and the other end is connected to the first bushing. The driving member can not only drive the rotating shaft to rotate, but also drive the rotating shaft or the first bushing to move axially along its own axis, so that the two ends of the blade along the axial direction of the rotating shaft approach or move away from each other, so that the size of the blade in the radial direction of the rotating shaft increases or decreases. In the above structure, the driving member can not only drive the rotating shaft and the blade to rotate to realize the pumping of blood, but also drive the rotating shaft or the first bushing to move axially along its own axis, so that the two ends of the blade including the deformable structure can approach or move away from each other along the axial direction of the rotating shaft, and the blade undergoes elastic deformation, so that the size of the blade in the radial direction of the rotating shaft can increase or decrease, so that the blood pumping catheter assembly can intervene in the human body with a smaller radial size.

[0022] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components.

[0024] Figure 1Schematic perspective view of the blood pumping catheter assembly provided in Embodiment 1 of the present application;

[0025] Figure 2 Schematic view of the structure of the blood pumping catheter assembly provided in Embodiment 1 of the present application in the state where the blades are retracted;

[0026] Figure 3 Schematic view of the structure of the blood pumping catheter assembly provided in Embodiment 1 of the present application in the state where the blades are deployed;

[0027] Figure 4 is Figure 3 Cross-sectional view taken along line A-A in

[0028] Figure 5 is Figure 2 Cross-sectional view taken along line B-B in

[0029] Figure 6 Cross-sectional view of the blood pumping catheter assembly provided in Embodiment 2 of the present application in the state where the blades are deployed.

[0030] In the drawings:

[0031] 1. Sheath tube; 2. First shaft sleeve; 21. First shaft hole; 22. First groove; 23. First protrusion; 24. Protruding part; 3. Pump unit; 31. Rotating shaft; 311. Second groove; 32. Blade; 321. Skeleton; 322. Thin film; 4. Driving member; 5. Positioning assembly; 51. Clamping member; 511. Connecting portion; 512. Clamping head; 5121. Abutting surface; 5122. Conical surface; 52. First elastic structure; 6. Moving tube; 61. Through hole; 7. Limiting shaft sleeve; 8. Tail assembly; 81. Tail piece; 82. Second shaft sleeve; 821. Second shaft hole; 822. Second protrusion; 83. Second elastic structure; 9. Protection tube; 10. First fixed shaft sleeve; 101. Second fixed shaft sleeve. Detailed implementation manners

[0032] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0033] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0034] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0035] In addition, technical terms such as "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] In the left ventricular blood flow assist system, the blood pumping catheter passes through the skin surface, enters the aortic vascular system through the femoral artery puncture access, crosses the aortic valve through the aortic arch and enters the left ventricle, establishing a blood flow channel between the left ventricle and the aorta. The inlet of the blood flow channel is located in the left ventricle, and the outlet is located in the aorta. Through the action of the driving member and the liquid pumping pump, the blood in the left ventricle is transported into the aorta, and then the blood flows to various tissues and organs of the body, providing auxiliary blood circulation support for the patient, reducing the patient's heart burden and oxygen consumption, and contributing to the recovery of heart function.

[0039] In order to reduce the intervention size of the blood pumping catheter assembly, some embodiments of the present application provide a blood pumping catheter assembly, which includes a sheath, a first shaft sleeve, a pump unit, and a driving member. The first shaft sleeve is rotatably connected to the sheath, the rotating shaft in the pump unit is movably connected to the first shaft sleeve, and a blade with a deformable structure is connected to one end of the rotating shaft along the axial direction and the other end is connected to the first shaft sleeve. The driving member is connected to the rotating shaft. The driving member can not only drive the rotating shaft to rotate, but also drive the rotating shaft to move along its own axial direction, so that the two ends of the blade along the axial direction of the rotating shaft approach or move away from each other, so that the size of the blade in the radial direction of the rotating shaft increases or decreases. In the above structure, the driving member can not only drive the rotating shaft and the blade to rotate to realize blood pumping, but also drive the rotating shaft to move along its own axial direction, so that the two ends of the blade including the deformable structure can approach or move away from each other along the axial direction of the rotating shaft, so that the size of the blade in the radial direction of the rotating shaft can increase or decrease, enabling the blood pumping catheter assembly to intervene in the human body with a smaller radial size.

[0040] The technical solutions of the blood pumping catheter assembly and the cardiac blood flow assist system provided by the present application will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0041] The present application provides a blood pumping catheter assembly, as Figures 1 to 5 shown. The blood pumping catheter assembly includes a sheath 1, a first shaft sleeve 2, a pump unit 3, and a driving member 4. The first shaft sleeve 2 is connected to the sheath 1. The pump unit 3 includes a rotating shaft 31 and a blade 32. The proximal part of the rotating shaft 31 is movably supported within the first shaft sleeve 2, and the rotating shaft 31 and the first shaft sleeve 2 are relatively movable. The blade 32 includes a deformable structure. One end of the blade 32 along the axial direction of the rotating shaft 31 is connected to the distal part of the rotating shaft 31, and the other end is connected to the first shaft sleeve 2. The driving member 4 is connected to the rotating shaft 31. The driving member 4 is configured to be able to drive the rotating shaft 31 to rotate. The driving member 4 can drive the rotating shaft 31 or the first shaft sleeve 2 to move along its own axial direction, so that the two ends of the blade 32 in the axial direction approach or move away from each other, so that the size of the blade 32 in the radial direction of the rotating shaft 31 increases or decreases.

[0042] The sheath tube 1 is a flexible and bendable tube structure. When it is inserted into the corresponding target blood vessel or blood transfusion organ of the human body through a percutaneous operation, it will not cause structural damage to the corresponding target blood vessel or blood transfusion organ, and can well adapt to the bending or coiling shape of the corresponding blood pipeline. The sheath tube 1 can connect devices such as the pump unit 3 in the blood pumping catheter assembly with external controllers, drivers and other devices of the human body. Driving parts 4, cables and other components can be arranged inside it, so as to realize the connection between components such as the pump unit 3 in the blood pumping catheter assembly and external devices of the human body, so that the components in the blood pumping catheter assembly can work normally according to the preset state.

[0043] The first bushing 2 can be a bushing that can rotate around its own axis. By rotatably connecting the first bushing 2 to the sheath tube 1, the first bushing 2 can rotate in the sheath tube 1, so that the sheath tube 1 can support the proximal part of the rotating shaft 31 connected to the first bushing 2, making the rotation of the rotating shaft 31 stable.

[0044] The rotating shaft 31 can be a shaft-like component at the center of the pump unit 3. The blade 32 can be a component in the pump unit 3 used to drive the fluid flow. The blade 32 is connected to the outer peripheral surface of the rotating shaft 31, and the blade 32 can rotate synchronously with the rotating shaft 31 to stir the blood flow. Exemplarily, the blade 32 can be configured as a helical blade, which is wound around the outer periphery of the rotating shaft 31, so that during the synchronous rotation with the rotating shaft 31, it can drive the blood to flow along the axial direction of the rotating shaft 31, realizing the pumping of the blood.

[0045] The driving part 4 can be a flexible shaft connected to the rotating shaft 31, which is used to apply a force or torque to the rotating shaft 31, and can not only drive the rotating shaft 31 to rotate, but also pull the rotating shaft 31; it can also be a component that can push the first bushing 2 to move relative to the rotating shaft 31, and its specific form can be set by those skilled in the art according to the actual situation. Exemplarily, the driving part 4 can be connected between the rotating shaft 31 and the external driver of the human body, so that the torque output by the driver can be transmitted to the rotating shaft 31 to drive the rotating shaft 31 to rotate. By arranging the driving part 4 in the sheath tube 1, the driving part 4 is not easy to contact with the organs or tissues of the human body, which is beneficial to reducing the harm caused to the human body when the driving part 4 operates.

[0046] By movably connecting the rotating shaft 31 to the first bushing 2, the rotating shaft 31 can move axially in the first bushing 2 under the pulling of the driving part 4.

[0047] The deformable structure can be an elastic structure capable of elastic deformation. By making the blade 32 include the deformable structure, the blade 32 can undergo elastic deformation. By connecting one end of the blade 32 along the axial direction of the rotating shaft 31 to the distal part of the rotating shaft 31 and the other end to the first bushing 2, when the driving member 4 drives the rotating shaft 31 to move along its own axial direction, the two ends of the blade 32 along the axial direction of the rotating shaft 31 can approach or move away from each other, and the blade 32 undergoes elastic deformation, so that the size of the blade 32 in the radial direction of the rotating shaft 31 can increase or decrease.

[0048] In the above structure, the driving member 4 can not only drive the rotating shaft 31 and the blade 32 to rotate to realize the pumping of blood, but also drive the rotating shaft 31 or the first bushing 2 to move along its own axial direction. In this embodiment, since one end of the blade 32 is fixed to the first bushing 2 and the other end can move axially relative to the first bushing 2 along with the rotating shaft 31, during the axial movement of the rotating shaft 31 or the first bushing 2, the two ends of the blade 32 including the deformable structure along the axial direction of the rotating shaft 31 can approach or move away from each other, and the blade 32 undergoes elastic deformation, so that the size of the blade 32 in the radial direction of the rotating shaft 31 can increase or decrease, enabling the blood pumping catheter assembly to intervene in the human body with a smaller radial size.

[0049] Embodiment 1

[0050] In some embodiments, the driving member 4 includes a driving shaft, the driving shaft can drive the rotating shaft 31 to move axially towards the first bushing 2, and the blood pumping catheter assembly further includes a positioning assembly 5. The positioning assembly 5 includes a clamping member 51. The first bushing 2 is provided with a first shaft hole 21, the rotating shaft 31 is slidably connected to the first shaft hole 21, the clamping member 51 is connected to the rotating shaft 31 and at least partially located in the first shaft hole 21, and the clamping member 51 can be clamped with the first bushing 2.

[0051] The driving shaft can be a flexible shaft connected to the rotating shaft 31, which is used to apply a force or torque to the rotating shaft 31, and can not only drive the rotating shaft 31 to rotate but also pull the rotating shaft 31.

[0052] The positioning assembly 5 can be a component for positioning the position of the rotating shaft 31 in its own axial direction. By positioning the rotating shaft 31 in its own axial direction, the distance between the two ends of the blade 32 along the axial direction of the rotating shaft 31 is maintained, so that the shape of the blade 32 can be maintained, facilitating the pumping of blood by the blade 32 and helping the blood pumping catheter assembly to maintain the blood pumping volume.

[0053] The snap - fitting member 51 can be a component with a certain elastic deformation ability. It can be snap - fitted to the first bushing 2 under the action of its own elastic force, realizing the positioning of the snap - fitting member 51 on the first bushing 2. By connecting the snap - fitting member 51 to the end face of the rotating shaft 31, the snap - fitting member 51 can position the rotating shaft 31 on the first bushing 2, so as to maintain the distance between the two ends of the blade 32 along the axial direction of the rotating shaft 31, enabling the shape of the blade 32 to be maintained.

[0054] The first shaft hole 21 can be the hole in the first bushing 2 for passing through the rotating shaft 31. The rotating shaft 31 is slidably connected to the first shaft hole 21, enabling the rotating shaft 31 to move along its own axial direction in the first shaft hole 21. By making at least part of the snap - fitting member 51 located in the first shaft hole 21, the snap - fitting member 51 can be conveniently telescoped in the first shaft hole 21. While achieving the snap - connection or disengagement with the first bushing 2, it is also beneficial to improve the utilization rate of space.

[0055] In some embodiments, as Figure 4 and Figure 5 shown, the positioning assembly 5 further includes a first elastic structure 52. The first elastic structure 52 is located in the first shaft hole 21 and is respectively connected to the inner wall of the first shaft hole 21 and the rotating shaft 31 at both ends. In the state where the snap - fitting member 51 is disengaged from the first bushing 2, the first elastic structure 52 can reset the rotating shaft 31 through elastic force.

[0056] By respectively connecting the two ends of the first elastic structure 52 to the inner wall of the first shaft hole 21 and the rotating shaft 31, the first elastic structure 52 can act on the rotating shaft 31. The first elastic structure 52 not only enables the snap - fitting member 51 to remain snap - connected to the first bushing 2 under the elastic force of the first elastic structure 52 after the snap - fitting member 51 extends out of the first shaft hole 21. At this time, the snap - fitting member 51 positions the rotating shaft 31, keeping the two ends of the blade 32 close to each other along the axial direction of the rotating shaft 31, and increasing the radial dimension of the blade 32 to realize the unfolding of the blade 32, as Figure 4 shown; the first elastic structure 52 also enables the first elastic structure 52 to reset the rotating shaft 31 through elastic force after the snap - fitting member 51 is disengaged from the first bushing 2. The snap - fitting member 51 will retract in the first shaft hole 21 driven by the rotating shaft 31, and the two ends of the blade 32 move away from each other along the axial direction of the rotating shaft 31, and the radial dimension of the blade 32 decreases to realize the folding of the blade 32, as Figure 5 shown.

[0057] By arranging the first elastic structure 52 in the first shaft hole 21, the extra space occupied by the first elastic structure 52 can be reduced, which is beneficial to improving the space utilization rate in the blood - pumping catheter assembly.

[0058] Exemplarily, the first shaft hole 21 is configured as a stepped hole. One end of the first elastic structure 52 is connected to the step of the stepped hole, and the other end is connected to the end face of the rotating shaft 31 near the clamping member 51. The first elastic structure 52 acts on the rotating shaft 31 through its own elastic force.

[0059] In some embodiments, the clamping member 51 includes a connecting portion 511 and a clamping head 512 that are connected to each other. The connecting portion 511 is connected between the clamping head 512 and the rotating shaft 31. The first elastic structure 52 is sleeved on the connecting portion 511. The clamping head 512 is provided with a abutting surface 5121, and the abutting surface 5121 can abut against the end face of the first shaft sleeve 2.

[0060] The connecting portion 511 and the clamping head 512 are different parts that make up the clamping member 51. Among them, the connecting portion 511 is located in the first shaft hole 21 and is connected between the clamping head 512 and the rotating shaft 31, and the clamping head 512 can be connected to the first shaft sleeve 2. The abutting surface 5121 can be a planar structure provided on the clamping head 512, which can abut against the end face of the first shaft sleeve 2 to realize the clamping connection between the clamping head 512 and the first shaft sleeve 2.

[0061] By being sleeved on the connecting portion 511, the first elastic structure 52 can not only reduce its occupied space in the first shaft hole 21, but also make the arrangement convenient. In this embodiment, the first elastic structure 52 is composed of a spring.

[0062] In some embodiments, the driving member 4 is configured to be able to drive the rotating shaft 31 to move towards the end face of the first shaft sleeve 2 that can abut against the abutting surface 5121, so that the end of the blade 32 connected to the rotating shaft 31 approaches the end of the blade 32 connected to the first shaft sleeve 2.

[0063] By configuring the driving member 4 to be able to drive the rotating shaft 31 to move towards the end face of the first shaft sleeve 2 that can abut against the abutting surface 5121, the driving member 4 can drive the rotating shaft 31 to move towards the end face of the first shaft sleeve 2 that can abut against the abutting surface 5121, so that the end of the blade 32 connected to the rotating shaft 31 continuously approaches the end of the blade 32 connected to the first shaft sleeve 2, thereby making the two ends of the blade 32 approach each other, the blade 32 undergoes elastic deformation, and the dimension of the blade 32 in the radial direction of the rotating shaft 31 can increase.

[0064] In some embodiments, the driving member 4 in the blood pumping catheter assembly further includes a moving tube 6 located in the sheath 1. The moving tube 6 is provided with a through hole 61, the driving shaft passes through the through hole 61, the clamping head 512 is provided with a conical surface 5122, and the moving tube 6 can act on the conical surface 5122 to disengage the clamping head 512 from the first shaft sleeve 2.

[0065] The conical surface 5122 can be the conical outer surface provided on the chuck 512, which has a component towards the moving tube 6. The moving tube 6 can be a tubular component disposed in the sheath tube 1 and movable along the axial direction of the rotating shaft 31. It is provided with a through hole 61, and the driving member 4 is passed through the through hole 61. The moving tube 6 is set to have a certain structural strength, and an operator can apply a force to the conical surface 5122 through the moving tube 6 to deform the chuck 512, so that the abutting surface 5121 is separated from the end surface of the first bushing 2, so that the first elastic structure 52 can reset the rotating shaft 31 through the elastic force, and the engaging member 51 retracts in the first shaft hole 21.

[0066] Exemplarily, the chuck 512 is set to a frustum-shaped structure, the driving member 4 passes through the chuck 512 along the axial direction of the chuck 512, and there is a gap in the radial direction of the chuck 512 between the wall of the chuck 512 and the driving member 4. This gap can provide a deformation space for the deformation of the chuck 512, so that when the moving tube 6 applies a force to the conical surface 5122, the chuck 512 can contract in its own radial direction to disengage from the abutment with the first bushing 2.

[0067] In some embodiments, the blood pumping catheter assembly further includes a protective tube 9. The protective tube 9 is located in the through hole 61 and sleeved outside the driving member 4 for protecting the driving member 4.

[0068] In some embodiments, a first groove 22 is provided on the outer peripheral surface of the first bushing 2, and the end of the blade 32 is connected to the wall surface of the first groove 22.

[0069] The first groove 22 can be a recess formed by the inward depression of the outer peripheral surface of the first bushing 2. By connecting the end of the blade 32 to the multiple wall surfaces of the first groove 22, it is beneficial to improve the connection strength between the blade 32 and the first bushing 2. Exemplarily, the first groove 22 is filled with an adhesive, and the end of the blade 32 is connected to the multiple wall surfaces of the first groove 22 through the adhesive.

[0070] In some embodiments, the blood pumping catheter assembly further includes a limiting bushing 7. The limiting bushing 7 is sleeved on the outer periphery of the first bushing 2 and covers the end of the blade 32.

[0071] The limiting bushing 7 can be a bushing sleeved on the outer peripheral surface of the first bushing 2. By covering the end of the blade 32, it can limit the end of the blade 32 in the first groove 22, which is beneficial to reducing the possibility of the blade 32 separating from the first bushing 2.

[0072] Exemplarily, the limiting bushing 7 can be in interference fit with the first bushing 2 to make the connection between the limiting bushing 7 and the first bushing 2 firm; the limiting bushing 7 can also be connected to the first bushing 2 in the form of bonding or welding to make the connection between the limiting bushing 7 and the first bushing 2 firm.

[0073] In some embodiments, a first protrusion 23 spaced from the limiting bushing 7 is provided on the outer periphery of the first bushing 2, and the sheath tube 1 is connected to the first bushing 2 between the first protrusion 23 and the limiting bushing 7.

[0074] The first protrusion 23 may be a structure protruding outward from the outer peripheral surface of the first bushing 2. By spacing the first protrusion 23 from the limiting bushing 7 and connecting the sheath tube 1 to the first bushing 2 between the first protrusion 23 and the limiting bushing 7, the sheath tube 1 can limit the movement of the first bushing 2 in the axial direction of the rotating shaft 31.

[0075] In some embodiments, a first fixed bushing 10 is connected to the wall of the sheath tube 1. The first fixed bushing 10 is located between the first protrusion 23 and the limiting bushing 7 and is rotatably sleeved on the outer peripheral surface of the first bushing 2. Since the first fixed bushing 10 is located between the first protrusion 23 and the limiting bushing 7, when the first bushing 2 and the first fixed bushing 10 move relative to each other, the first protrusion 23 and the limiting bushing 7 can limit the movement of the first bushing 2.

[0076] In some embodiments, the blood pumping catheter assembly further includes a tail assembly 8. The tail assembly 8 includes a tail piece 81 and a second bushing 82. The second bushing 82 is rotatably connected to the tail piece 81, and the second bushing 82 is provided with a second shaft hole 821. The rotating shaft 31 passes through the second shaft hole 821.

[0077] The tail assembly 8 may be an assembly provided at the end of the rotating shaft 31 away from the moving tube 6. The tail piece 81 may be a component for supporting the rotating shaft 31, and the second bushing 82 may be a bushing capable of rotating about its own axis. By rotatably connecting the second bushing 82 to the tail piece 81, the second bushing 82 can rotate in the tail piece 81, enabling the tail piece 81 to support the rotating shaft 31 passing through the second shaft hole 821 in the second bushing 82 and making the rotation of the rotating shaft 31 stable.

[0078] In some embodiments, a second groove 311 is provided on the outer peripheral surface of the rotating shaft 31, and the end of the blade 32 is connected to the wall surface of the second groove 311.

[0079] The second groove 311 may be a recess formed by inward depression of the outer peripheral surface of the rotating shaft 31. By connecting the end of the blade 32 to the multiple wall surfaces of the second groove 311, it is beneficial to improve the connection strength between the blade 32 and the rotating shaft 31. Exemplarily, the second groove 311 is filled with an adhesive, and the end of the blade 32 is connected to the multiple wall surfaces of the second groove 311 through the adhesive.

[0080] In some embodiments, the end of the blade 32 connected to the second groove 311 is located in the second shaft hole 821.

[0081] By disposing the end of the blade 32 connected to the second groove 311 in the second shaft hole 821, the second shaft sleeve 82 can cover the end of the blade 32, and the end of the blade 32 can be limited in the second groove 311, which is beneficial to reducing the possibility of the blade 32 disengaging from the rotating shaft 31.

[0082] In some embodiments, a second protrusion 822 is provided on the outer periphery of the second shaft sleeve 82. The tail assembly 8 includes a second elastic structure 83. Two ends of the second elastic structure 83 are respectively connected to the tail piece 81 and the second shaft sleeve 82, and the second elastic structure 83 makes the second protrusion 822 abut against the tail piece 81.

[0083] The second protrusion 822 may be a structure protruding outward from the outer peripheral surface of the second shaft sleeve 82. By connecting two ends of the second elastic structure 83 to the tail piece 81 and the second shaft sleeve 82 respectively to abut the second protrusion 822 against the tail piece 81, the axial movement of the second shaft sleeve 82 on the rotating shaft 31 can be reduced, which is beneficial to improving the rotational stability of the rotating shaft 31.

[0084] In this embodiment, the second elastic structure 83 is composed of a spring.

[0085] In some embodiments, a second fixed shaft sleeve 101 is connected to the wall of the tail piece 81. The second fixed shaft sleeve 101 is rotatably sleeved on the second shaft sleeve 82 and is located on the side of the second protrusion 822 away from the second elastic structure 83, so that the tail piece 81 supports the second shaft sleeve 82 through the second fixed shaft sleeve 101.

[0086] In some embodiments, the blade 32 includes a framework 321 and a thin film 322 connected to the framework 321. Two ends of the framework 321 along the axial direction of the rotating shaft 31 are respectively connected to the rotating shaft 31 and the first shaft sleeve 2, and the framework 321 is configured to arch outward from the rotating shaft 31.

[0087] The framework 321 may be the main structure of the blade 32 that plays a supporting role and is used to maintain the shape of the blade 32. The thin film 322 may be the structure of the blade 32 that plays a role in pushing blood. By setting the framework 321 to arch outward from the rotating shaft 31, a space can be formed between the framework 321 and the rotating shaft 31, and the thin film 322 connected to the framework 321 is located in this space, so that the framework 321 and the thin film 322 form the blade 32. By connecting two ends of the framework 321 along the axial direction of the rotating shaft 31 to the rotating shaft 31 and the first shaft sleeve 2 respectively, the rotating shaft 31, the blade 32 and the first shaft sleeve 2 rotate synchronously to pump blood. During this process, since both the clamping member 51 and the first shaft sleeve 2 rotate synchronously with the rotating shaft 31, the clamping member 51 and the first shaft sleeve 2 do not rotate relative to each other, reducing the wear of the clamping member 51.

[0088] Exemplarily, the skeleton 321 is formed of nickel-titanium wire or a material with self-healing properties, and the film 322 can be formed of an elastic material such as thermoplastic polyurethane, polytetrafluoroethylene or polyethylene terephthalate with an elongation of more than 300%, so that the film 322 has good elastic deformation ability, and the film 322 is connected to the skeleton 321 by suturing.

[0089] Embodiment 2

[0090] In some embodiments, the driving member 4 further includes a driving portion located in the sheath tube 1 , and the driving portion is configured to push the first sleeve 2 to move toward the distal end of the rotating shaft 31 .

[0091] The driving part can be the moving tube 6 in the aforementioned technical solution, so that the driving part can push the first sleeve 2 to move toward the distal end of the rotating shaft 31. After the clamp 512 is disengaged from the end face of the first sleeve 2, the moving tube 6 can pass over the clamping member 51 to act on the end face of the first sleeve 2, so that the moving tube 6 can push the first sleeve 2 to move toward the distal end of the rotating shaft 31, and the first sleeve 2 continuously approaches the distal end of the rotating shaft 31, so that the two ends of the blade 32 continuously approach each other, the blade 32 undergoes elastic deformation, and the size of the blade 32 in the radial direction of the rotating shaft 31 can be increased.

[0092] In this embodiment, the driving member 4 increases the radial size of the blade 32 in a different manner from that in the first embodiment, and this is achieved by the driving member pushing the first sleeve 2 to move toward the distal end of the rotating shaft 31. It is understandable that other technical features of this embodiment may be consistent with those of the first embodiment.

[0093] In some embodiments, Figure 6 As shown, the outer circumferential surface of the first sleeve 2 is sequentially provided with two protrusions 24, and a groove is formed between the two protrusions 24; a first fixed sleeve 10 is connected to the wall of the sheath 1, and the first fixed sleeve 10 is sleeved on the outer circumferential surface of the first sleeve 2, and the first fixed sleeve 10 is located in the groove, and the first fixed sleeve can limit the first sleeve 2 in the axial direction.

[0094] The two protrusions 24 are arranged at intervals along the axial direction of the first sleeve 2 and protrude from the outer circumferential surface of the first sleeve 2, so that the first fixed sleeve 10 can slide relative to the first sleeve 2 in the groove between the two protrusions 24, thereby realizing the movement of the first sleeve 2 under the push of the driving part. At the same time, the two protrusions 24 arranged at intervals can also realize the blocking of the first sleeve 2 pushed by the driving part by blocking the movement of the first sleeve 2.

[0095] In some embodiments, the first bushing 2 has a distal position and a proximal position relative to the rotating shaft 31, and the driving member 4 is configured such that when the first bushing 2 is in the distal position, the driving member 4 abuts against the first bushing 2.

[0096] The distal position and the proximal position may be two different positions that the first bushing 2 has relative to the rotating shaft 31. Among them, when the first bushing 2 is in the distal position, the driving member 4 abuts against the first bushing 2, and a protruding portion 24 of the first bushing 2 abuts against the first fixed bushing 10, so that a protruding portion 24 is positioned by the first bushing 2 and the first fixed bushing 10, realizing the positioning of the first bushing 2, keeping the first bushing 2 located near the distal end of the rotating shaft 31, thereby keeping the two ends of the blade 32 close, the blade 32 being elastically deformed, and the dimension of the blade 32 in the radial direction of the rotating shaft 31 remaining in an enlarged state.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A blood pumping catheter assembly, characterized in that, Comprising: Sheath tube; First bushing, connected to the sheath tube; Pump unit, including a rotating shaft and blades, the proximal part of the rotating shaft is supported in the first bushing, and the rotating shaft and the first bushing are relatively movable; the blades include a deformable structure, one end of the blade is connected to the distal part of the rotating shaft, and the other end of the blade is connected to the first bushing; A driving member located in the sheath tube, the driving member is configured to be able to drive the rotating shaft to rotate; the driving member can drive the rotating shaft or the first bushing to move, so that the two ends of the blade in the axial direction approach or move away from each other, so that the size of the blade in the radial direction increases or decreases.

2. The blood pumping catheter assembly according to claim 1, wherein, The driving member includes a driving shaft, the driving shaft can drive the rotating shaft to axially move towards the first bushing, the blood pumping catheter assembly further includes a positioning assembly, the positioning assembly includes a clamping member, the first bushing is provided with a first shaft hole, the clamping member is connected to the rotating shaft and at least partially located in the first shaft hole, and the clamping member can be clamped with the first bushing.

3. The blood pumping catheter assembly according to claim 2, wherein The positioning assembly further includes a first elastic structure, the first elastic structure is located in the first shaft hole, and the two ends are respectively connected to the inner wall of the first shaft hole and the rotating shaft. In the state where the clamping member is disengaged from the first bushing, the first elastic structure can reset the rotating shaft through elastic force.

4. The blood pumping catheter assembly according to claim 2, wherein The clamping member includes a connecting portion and a clamping head connected to each other, the connecting portion is connected between the clamping head and the rotating shaft, and the clamping head is provided with a resisting surface, and the resisting surface can resist against the end surface of the first bushing.

5. The blood pumping catheter assembly according to claim 4, wherein, The driving member further includes a moving tube located in the sheath tube, the moving tube is provided with a through hole, the driving shaft passes through the through hole, the clamping head is provided with a conical surface, and the moving tube can act on the conical surface to disengage the clamping head from the first bushing.

6. The blood pumping catheter assembly according to claim 1, wherein, The driving member further includes a driving portion located in the sheath tube, and the driving portion is configured to be able to push the first bushing to move towards the distal end of the rotating shaft.

7. The blood pumping catheter assembly according to claim 6, wherein, Two protruding portions are sequentially provided on the outer peripheral surface of the first bushing, and a groove is formed between the two protruding portions; a first fixed bushing is provided on the sheath tube, the first fixed bushing is sleeved on the outer peripheral surface of the first bushing, and the first fixed bushing is located in the groove, and the first fixed bushing can limit the position of the first bushing in the axial direction.

8. The blood pumping catheter assembly according to claim 6, wherein, The first bushing has a distal position and a proximal position relative to the rotating shaft, and the driving member is configured to: when the first bushing is in the distal position, the driving portion abuts against the first bushing.

9. The blood pumping catheter assembly according to claim 1, wherein The deformable structure is an elastic structure.

10. The blood pumping catheter assembly according to any one of claims 1 to 9, characterized in that, The blade includes a framework and a thin film arranged on the framework, the two ends of the framework in the axial direction are respectively connected to the rotating shaft and the first bushing, and the framework is configured to be able to arch along the radial direction of the rotating shaft.

11. The blood pumping catheter assembly according to any one of claims 1 to 9, characterized in that, The blood pumping catheter assembly further includes a tail assembly, the tail assembly includes a tail piece and a second bushing, the second bushing is rotatably connected to the tail piece, the second bushing is provided with a second shaft hole, and the rotating shaft passes through the second shaft hole.

12. The blood pumping catheter assembly according to claim 11, wherein, The outer periphery of the second bushing is provided with a second protrusion. The tail assembly includes a second elastic structure, and two ends of the second elastic structure are respectively connected to the tail piece and the second bushing. The second elastic structure enables the second protrusion to abut against the tail piece.

13. A cardiac blood flow assistance system, characterized in that, A blood pumping catheter assembly includes the one according to any one of claims 1 to 12.

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