Blood pumping device and intervention sheath tube

Abstract

The utility model discloses a blood pumping device and an intervention sheathing canal, the blood pumping device comprises the intervention sheathing canal and a far-end assembly located at the far end of the intervention sheathing canal, the intervention sheathing canal comprises a sheathing canal body, a transmission assembly, a first bearing and an occupying assembly, and the sheathing canal body is internally provided with a containing cavity and a perfusion pipeline which communicate with each other; the transmission assembly is at least partially located in the containing cavity. The first bearing is located in the containing cavity and connected with the sheathing canal body, the transmission assembly is sleeved with the first bearing, and a flow channel for perfusate to flow is formed in the first bearing; the occupying assembly comprises at least one occupying part located in the containing cavity, a circulation pipeline is formed in the occupying part or between the occupying part and at least one of the sheathing canal body, the transmission assembly and the first bearing, and the circulation pipeline communicates with the perfusion pipeline and the flow channel; the single-side offset size of the circulation pipeline relative to the flow channel is smaller than or equal to the radial size of the flow channel.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a blood pumping device and an interventional sheath. BACKGROUND

[0002] In a heart surgery, due to the patient's own disease or the need of the surgery, the patient's heart function is weakened, and the blood pumping capacity is insufficient. At this time, it is necessary to insert a ventricular assist device and other active interventional medical devices into the heart to assist the heart in pumping blood. The existing ventricular assist device uses the principle of heart blood pumping to pump the blood in the heart out through a pumping mechanism and guide the blood to the aorta outside the heart to flow to the whole body.

[0003] In some scenarios, the ventricular assist device generates heat when it is running, so it needs to rely on the flowing perfusion liquid to cool it down when in use. However, the perfusion and drainage path is complex and tortuous, and it is easy to produce bubbles that are not easy to drain in the path, causing the risk of perfusion liquid flow interruption, blood backflow or bubbles entering the blood vessels. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a blood pumping device, which can reduce the bubble residue in the perfusion and drainage pipeline.

[0005] The embodiments of the present application provide a blood pumping device, which comprises an interventional sheath and a distal end assembly located at the distal end of the interventional sheath. The interventional sheath comprises a sheath body, a transmission assembly, a first bearing and a space occupying assembly. The sheath body is internally provided with a communicating accommodation cavity and a perfusion pipeline. The transmission assembly is at least partially located in the accommodation cavity. The first bearing is located in the accommodation cavity and connected with the sheath body. The first bearing is sleeved on the transmission assembly, and the first bearing is internally provided with a flow channel for flowing perfusion liquid. The space occupying assembly comprises at least one space occupying member located in the accommodation cavity. A flow pipeline is formed between the space occupying member or at least one of the space occupying member, the sheath body, the transmission assembly and the first bearing, and the flow channel is in communication with the perfusion pipeline and the flow pipeline. The one-side misalignment dimension of the flow pipeline relative to the flow channel is less than or equal to the radial dimension of the flow channel.

[0006] According to the embodiments of the first aspect of the present application, the flow channel comprises a first inner peripheral surface facing the transmission assembly and a first outer peripheral surface away from the transmission assembly, and the spacing between the first inner peripheral surface and the first outer peripheral surface is the radial dimension of the flow channel.

[0007] According to the embodiments of the first aspect of the present application, the flow channel comprises a first inner peripheral surface facing the transmission assembly and a first outer peripheral surface away from the transmission assembly, and the flow pipeline comprises a second inner peripheral surface facing the transmission assembly and a second outer peripheral surface away from the transmission assembly. The one-side misalignment dimension of the flow pipeline relative to the flow channel can be the spacing between the second inner peripheral surface and the first inner peripheral surface, or the spacing between the second outer peripheral surface and the first outer peripheral surface. Both of the one-side misalignment dimensions are less than or equal to the radial dimension of the flow channel.

[0008] According to an embodiment of the first aspect of the present application, the minimum distance between the center line of the flow channel and the center line of the flow passage is less than or equal to the radial dimension of the flow channel; wherein the minimum distance between the center line of the flow channel and the first inner circumferential surface and the first outer circumferential surface is equal, and the minimum distance between the center line of the flow passage and the second inner circumferential surface and the second outer circumferential surface is equal.

[0009] According to an embodiment of the first aspect of the present application, the flow channel and the flow passage are both annular passages arranged around the transmission assembly, the axis of the flow channel is parallel to the axis of the flow passage, and the distance between the axis of the flow channel and the axis of the flow passage is less than or equal to the radial dimension of the flow channel; and / or, the flow channel and the flow passage are both annular passages arranged around the transmission assembly, the axis of the flow channel is collinear with the axis of the flow passage.

[0010] According to an embodiment of the first aspect of the present application, the circumferential surface formed by the center line of the flow channel intersects or is coplanar with the circumferential surface formed by the center line of the flow passage.

[0011] According to an embodiment of the first aspect of the present application, the first inner circumferential surface is connected to the second inner circumferential surface, the first outer circumferential surface is connected to the second outer circumferential surface, and the radial dimension of the flow passage is equal to the radial dimension of the flow channel.

[0012] According to an embodiment of the first aspect of the present application, the flow channel includes a first inner circumferential surface facing the transmission assembly and a first outer circumferential surface facing away from the transmission assembly, the flow passage includes a second inner circumferential surface facing the transmission assembly and a second outer circumferential surface facing away from the transmission assembly, the first inner circumferential surface is connected to the second inner circumferential surface, the included angle between the first inner circumferential surface and the second inner circumferential surface is greater than 90° and less than or equal to 180°, the first outer circumferential surface is connected to the second outer circumferential surface, and the included angle between the first outer circumferential surface and the second outer circumferential surface is greater than 90° and less than or equal to 180°.

[0013] According to an embodiment of the first aspect of the present application, the accommodation cavity includes a bearing accommodation cavity, the first bearing is located in the bearing accommodation cavity; the occupying assembly includes a first occupying member located in the bearing accommodation cavity, the first occupying member is provided with a first passage in communication with the perfusion passage, and the radial dimension of the first passage is equal to the radial dimension of the flow channel.

[0014] According to an embodiment of the first aspect of the present application, two first bearings are provided in the same bearing accommodation cavity and are arranged in the axial direction of the transmission assembly, and the first occupying member is located between the two first bearings.

[0015] According to an embodiment of the first aspect of the present application, the first occupying member includes a third sub-member and a fourth sub-member, the third sub-member is sleeved outside the transmission assembly, the fourth sub-member is sleeved outside the third sub-member, the gap between the third sub-member and the fourth sub-member forms the first passage, and the distance between the outer circumferential surface of the third sub-member and the inner circumferential surface of the fourth sub-member in the radial direction of the intervention sheath tube is equal to the radial dimension of the flow channel.

[0016] According to the embodiment of the first aspect of the present application, the proximal end and the distal end of the third sub-piece respectively abut against two first bearings, and the proximal end and the distal end of the fourth sub-piece respectively abut against two first bearings.

[0017] According to the embodiment of the first aspect of the present application, the bearing accommodating cavity comprises a proximal end accommodating cavity and a distal end accommodating cavity; the sheath body further comprises an extension cavity extending from the proximal end to the distal end, the extension cavity directly or indirectly communicates with the proximal end accommodating cavity and the distal end accommodating cavity, at least part of the transmission assembly extends from the proximal end accommodating cavity to the distal end accommodating cavity through the extension cavity, at least one first bearing is arranged in the proximal end accommodating cavity and the distal end accommodating cavity; at least one of the proximal end accommodating cavity and the distal end accommodating cavity is provided with a first occupying piece.

[0018] According to the embodiment of the first aspect of the present application, the accommodating cavity further comprises a first transition cavity communicating the distal end accommodating cavity and the extension cavity, the radial dimension of the distal end accommodating cavity is greater than the radial dimension of the extension cavity, and the radial dimension of the first transition cavity gradually decreases in the direction from the distal end to the proximal end; the occupying assembly further comprises a third occupying piece, the third occupying piece is located in the first transition cavity and is sleeved outside the transmission assembly, the third occupying piece is provided with a first surface away from the transmission assembly, the distance between the first surface and the axis of the transmission assembly gradually decreases in the direction from the distal end to the proximal end, and the gap between the first surface and the conical surface of the first transition cavity forms a fourth pipeline communicating the flow channel and the extension cavity.

[0019] According to the embodiment of the first aspect of the present application, the distance between the first surface and the conical surface of the first transition cavity in the radial direction of the interventional sheath is equal to the radial dimension of the flow channel; the first surface is connected with the first inner circumferential surface, and the included angle between the first surface and the first inner circumferential surface is greater than 90° and less than 180°; the conical surface of the first transition cavity is connected with the first outer circumferential surface, and the included angle between the conical surface of the first transition cavity and the first outer circumferential surface is greater than 90° and less than 180°.

[0020] According to the embodiment of the first aspect of the present application, the transmission assembly comprises a first transmission shaft and an impeller connected with each other, the first transmission shaft extends from the first transition cavity to the extension cavity, the impeller comprises an impeller shaft and an impeller body connected with each other, the impeller body extends from the distal end accommodating cavity to the outflow passage; at least part of the impeller shaft is sleeved outside the first transmission shaft, and extends from the first transition cavity to the distal end accommodating cavity and is connected with the impeller body; the third occupying piece comprises a first sub-piece and a second sub-piece, the first sub-piece is sleeved outside the impeller shaft, the second sub-piece is sleeved outside the first transmission shaft, the first sub-piece is located at the distal end of the second sub-piece, the distance between the first surface of the first sub-piece and the axis of the transmission assembly, and the distance between the first surface of the second sub-piece and the axis of the transmission assembly gradually decrease in the direction from the distal end to the proximal end, and the distance between the first surface of the first sub-piece and the conical surface of the first transition cavity in the radial direction of the interventional sheath is equal to the distance between the first surface of the second sub-piece and the conical surface of the first transition cavity in the radial direction of the interventional sheath.

[0021] According to the embodiment of the first aspect of the present application, the accommodation cavity further comprises a second transition cavity, and the sheath body further comprises a power cavity, and the proximal end accommodation cavity, the second transition cavity and the power cavity are arranged in sequence in the direction from the distal end to the proximal end; the transmission assembly comprises coaxially connected first and second transmission shafts, at least part of the first transmission shaft is located in the extension cavity, the second transmission shaft extends into the extension cavity from the power cavity through the proximal end accommodation cavity and is connected with the first transmission shaft, the second transmission shaft comprises first, second and third sub-shafts arranged in sequence in the direction from the distal end to the proximal end, at least part of the first sub-shaft is located in the proximal end accommodation cavity, the second sub-shaft is located in the second transition cavity, and at least part of the third sub-shaft is located in the power cavity, the radial dimension of the second sub-shaft is smaller than the radial dimensions of the first and third sub-shafts; the occupying assembly further comprises fourth and fifth occupying members both located in the second transition cavity, the fourth occupying member is sleeved outside the second sub-shaft, the fifth occupying member is sleeved outside the fourth occupying member, and a gap between the fourth and fifth occupying members forms a second pipeline, which is in communication with the flow channel in the proximal end accommodation cavity.

[0022] According to the embodiment of the first aspect of the present application, the fifth occupying member is provided with a notch penetrating the fifth occupying member in the radial direction, and the perfusion pipeline is directly or indirectly communicated with the second pipeline through the notch.

[0023] According to the embodiment of the first aspect of the present application, the radial dimension of the second pipeline is equal to the radial dimension of the flow channel; the outer peripheral surface of the fourth occupying member is connected with the first inner peripheral surface of the first bearing located in the proximal end accommodation cavity, and the included angle between the outer peripheral surface of the fourth occupying member and the first inner peripheral surface of the first bearing located in the proximal end accommodation cavity is equal to 180°, the inner peripheral surface of the fifth occupying member is connected with the first outer peripheral surface of the first bearing located in the proximal end accommodation cavity, and the included angle between the inner peripheral surface of the fifth occupying member and the first outer peripheral surface of the first bearing located in the proximal end accommodation cavity is equal to 180°.

[0024] According to the embodiment of the first aspect of the present application, the sheath body further comprises a third transition cavity located between the power cavity and the second transition cavity; the blood pumping device further comprises a first plug located in the third transition cavity.

[0025] According to the embodiment of the first aspect of the present application, the sheath body further comprises a reflux pipeline in communication with the accommodation cavity, the perfusion liquid of the perfusion pipeline flows to the reflux pipeline after flowing through the first bearing and the first pipeline, and at least part of the reflux pipeline is composed of the cavity of the sheath body after the transmission assembly is removed from the extension cavity.

[0026] According to an embodiment of the first aspect of the present application, the sheath body further comprises a fourth transition cavity and a fifth transition cavity, and the outer circumferential surface of the sheath body further comprises a first outlet in communication with the fourth transition cavity, the fourth transition cavity extends along the axial direction of the sheath body, the fifth transition cavity extends along the radial direction of the sheath body, the fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity, and the perfusion liquid in the extension cavity flows out of the intervention sheath in sequence through the fifth transition cavity, the fourth transition cavity and the first outlet; the blood pumping device further comprises a second plug, the second plug is located at one end of the fourth transition cavity away from the first outlet, and at least part of the reflux pipeline is formed by the cavity of the fourth transition cavity after the second plug is removed.

[0027] According to an embodiment of the first aspect of the present application, the receiving cavity further comprises a sixth transition cavity, the sixth transition cavity is in communication with the bearing receiving cavity, and the radial dimension of the sixth transition cavity is smaller than the radial dimension of the bearing receiving cavity in direct communication therewith; the occupying assembly further comprises an eighth occupying member and a ninth occupying member located in the sixth transition cavity, the eighth occupying member is sleeved outside the transmission assembly, the ninth occupying member is sleeved outside the eighth occupying member, the eighth occupying member is provided with a second surface away from the transmission assembly, the ninth occupying member is provided with a third surface facing the second surface, the distance between the second surface and the axis of the transmission assembly and the distance between the third surface and the axis of the transmission assembly gradually decrease in the direction away from the receiving cavity, and the gap between the second surface and the third surface forms a third pipeline in communication with the flow channel.

[0028] According to an embodiment of the first aspect of the present application, the distance between the second surface and the third surface in the radial direction of the intervention sheath is equal to the radial dimension of the flow channel; the second surface is connected with the first inner circumferential surface, and the included angle between the second surface and the first inner circumferential surface is greater than 90° and less than 180°; the third surface is connected with the first outer circumferential surface, and the included angle between the third surface and the first outer circumferential surface is greater than 90° and less than 180°.

[0029] The embodiment of the second aspect of the present application provides an intervention sheath, which comprises a sheath body, a transmission assembly, a first bearing and an occupying assembly, the sheath body is internally provided with a receiving cavity and a perfusion pipeline in communication; the transmission assembly is at least partially located in the receiving cavity; the first bearing is located in the receiving cavity and connected with the sheath body, the first bearing is sleeved outside the transmission assembly, the first bearing is internally provided with a flow channel for circulating perfusion liquid, the occupying assembly comprises at least one occupying member located in the receiving cavity, a circulating pipeline is formed in the occupying member or between the occupying member and at least one of the sheath body, the transmission assembly and the first bearing, and the circulating pipeline is in communication with the perfusion pipeline and the flow channel. In the radial direction, the unilateral displacement dimension of the circulating pipeline relative to the flow channel is less than or equal to the dimension of the flow channel.

[0030] In some application scenarios, the flow passage includes a first inner peripheral surface facing the transmission assembly and a first outer peripheral surface facing away from the transmission assembly, and a spacing between the first inner peripheral surface and the first outer peripheral surface is a radial dimension of the flow passage. The flow passage includes a second inner peripheral surface facing the transmission assembly and a second outer peripheral surface facing away from the transmission assembly. The single-side offset dimension can be a spacing between the second inner peripheral surface and the first inner peripheral surface, or can also be a spacing between the second outer peripheral surface and the first outer peripheral surface. The single-side offset dimension is less than or equal to the radial dimension of the flow passage.

[0031] According to an embodiment of the second aspect of the present application, a minimum spacing between a center line of the flow passage and a center line of the flow passage is less than or equal to the radial dimension of the flow passage; wherein the minimum spacing between the center line of the flow passage and the first inner peripheral surface and the first outer peripheral surface is equal, and the minimum spacing between the center line of the flow passage and the second inner peripheral surface and the second outer peripheral surface is equal.

[0032] According to an embodiment of the second aspect of the present application, the flow passage and the flow passage are both annular passages arranged around the transmission assembly, an axis of the flow passage is parallel to an axis of the flow passage, and a spacing between the axis of the flow passage and the axis of the flow passage is less than or equal to the radial dimension of the flow passage.

[0033] According to an embodiment of the second aspect of the present application, the flow passage and the flow passage are both annular passages arranged around the transmission assembly, an axis of the flow passage is parallel to an axis of the flow passage, and a spacing between the axis of the flow passage and the axis of the flow passage is less than or equal to the radial dimension of the flow passage.

[0034] According to an embodiment of the second aspect of the present application, a circumferential surface formed by the center line of the flow passage and a circumferential surface formed by the center line of the flow passage intersect or are coplanar.

[0035] According to an embodiment of the second aspect of the present application, the first inner peripheral surface is connected to the second inner peripheral surface, and the first outer peripheral surface is connected to the second outer peripheral surface, and a radial dimension of the flow passage is equal to a radial dimension of the flow passage.

[0036] According to an embodiment of the second aspect of the present application, the first inner peripheral surface is connected to the second inner peripheral surface, and an included angle between the first inner peripheral surface and the second inner peripheral surface is greater than 90° and less than or equal to 180°, and the first outer peripheral surface is connected to the second outer peripheral surface, and an included angle between the first outer peripheral surface and the second outer peripheral surface is greater than 90° and less than or equal to 180°.

[0037] According to an embodiment of the second aspect of the present application, the accommodating cavity includes a bearing accommodating cavity, and the first bearing is located in the bearing accommodating cavity; the occupying assembly includes a first occupying member located in the bearing accommodating cavity, and a first passage in communication with the perfusion passage is arranged in the first occupying member, and a radial dimension of the first passage is equal to a radial dimension of the flow passage.

[0038] The embodiment of the third aspect of the application provides a blood pumping device, comprising an intervention sheath and an outflow channel located at the distal end of the intervention sheath, the intervention sheath comprising a sheath body, a transmission assembly, a first bearing and a space occupying assembly, the sheath body being internally provided with a communicating accommodation cavity and a perfusion pipeline; the transmission assembly is at least partially located in the accommodation cavity; the first bearing is located in the accommodation cavity and connected with the sheath body, the first bearing is sleeved outside the transmission assembly, and the first bearing is internally provided with a flow channel for circulating perfusion liquid; the space occupying assembly comprises at least one space occupying member located in the accommodation cavity, and a flow circulation management is formed between the space occupying member or at least one of the space occupying member, the sheath body, the transmission assembly and the first bearing; the flow circulation pipeline is in communication with the perfusion pipeline and the flow channel, and the angle between the extension direction of the flow circulation pipeline and the extension direction of the flow channel is greater than 90° and less than or equal to 180°.

[0039] The embodiment of the fourth aspect of the application provides an intervention sheath, comprising a sheath body, a transmission assembly, a first bearing and a space occupying assembly, the sheath body being internally provided with a communicating accommodation cavity and a perfusion pipeline; the transmission assembly is at least partially located in the accommodation cavity; the first bearing is located in the accommodation cavity and connected with the sheath body, the first bearing is sleeved outside the transmission assembly, and the first bearing is internally provided with a flow channel for circulating perfusion liquid; the space occupying assembly comprises at least one space occupying member located in the accommodation cavity, and a flow circulation management is formed between the space occupying member or at least one of the space occupying member, the sheath body, the transmission assembly and the first bearing; the flow circulation pipeline is in communication with the perfusion pipeline and the flow channel, and the angle between the extension direction of the flow circulation pipeline and the extension direction of the flow channel is greater than 90° and less than or equal to 180°.

[0040] The blood pumping device of the embodiment of the application comprises an intervention sheath and a distal end assembly located at the distal end of the intervention sheath. The intervention sheath comprises a sheath body, a transmission assembly, a first bearing and a space occupying assembly. The sheath body is internally provided with a receiving cavity and a perfusion pipeline which are independent of each other and are connected. The transmission assembly is at least partially located in the receiving cavity. The first bearing is located in the receiving cavity and is connected with the sheath body. The first bearing is sleeved on the transmission assembly, and the first bearing is internally provided with a flow channel for circulating perfusion liquid. The space occupying assembly comprises at least one space occupying member located in the receiving cavity. The space occupying member or the space between the space occupying member and at least one of the sheath body, the transmission assembly and the first bearing forms a flow circulation management. The flow circulation pipeline is in communication with the perfusion pipeline and the flow channel. The one-side displacement dimension of the flow circulation pipeline relative to the flow channel is less than or equal to the radial dimension of the flow channel. According to the application, the space occupying member is arranged in the receiving cavity for accommodating the first bearing. The space occupying member occupies the excess cavity in the receiving cavity, so as to reduce the residual bubbles in the perfusion and drainage pipeline. The space occupying member or the space between the space occupying member and at least one of the sheath body, the transmission assembly and the first bearing forms the flow circulation pipeline which is in communication with the perfusion pipeline and the flow channel. The one-side displacement dimension of the flow circulation pipeline relative to the flow channel is less than or equal to the radial dimension of the flow channel. The radial dimension difference between the flow channel and other pipelines in the receiving cavity is reduced, the perfusion liquid in the receiving cavity is less hindered when flowing through the flow channel and the flow circulation pipeline, the flowability of the perfusion liquid in the receiving cavity is improved, and the retention of the perfusion liquid in the receiving cavity is reduced. The perfusion and drainage path is optimized. The space occupying assembly fills and covers the exhaust dead zone on the perfusion and drainage path. The structure reduces the exhaust dead zone, reduces the risk of blood backflow into the intervention sheath and bubbles into the human body. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. Those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0042] Figure 1 FIG. 1 is a schematic diagram of a partial longitudinal section of an outflow channel and a distal end of an intervention sheath according to some embodiments of the application;

[0043] Figure 2 FIG. 2 is a schematic diagram of a partial longitudinal section of an outflow channel and a distal end of an intervention sheath after hiding a space occupying assembly according to some embodiments of the application;

[0044] Figure 3 FIG. 3 is a schematic diagram of a partial longitudinal section of an outflow channel and a distal end of an intervention sheath according to some embodiments of the application; Figure 1 FIG. 4 is a schematic diagram of a partial enlarged view of an outflow channel and a distal end of an intervention sheath at a position A according to some embodiments of the application;

[0045] Figure 4 FIG. 5 is a schematic diagram of a longitudinal section of a first bearing according to some embodiments of the application;

[0046] Figure 5 A schematic view showing a transverse cross-sectional view of a first placeholder of an example;

[0047] Figure 6 A schematic view showing a longitudinal cross-sectional view of an eighth placeholder and a ninth placeholder of an example;

[0048] Figure 7 A schematic view showing a partial longitudinal cross-sectional view of a proximal end of an intervention sheath of an example;

[0049] Figure 8 A schematic view showing a partial longitudinal cross-sectional view of a proximal end of an intervention sheath of an example after hiding a placeholder assembly, a first plug and a second plug;

[0050] Figure 9 A schematic view showing a partial longitudinal cross-sectional view of a second transmission shaft of an example;

[0051] Figure 10 A schematic view showing a transverse cross-sectional view of a fourth placeholder and a fifth placeholder of an example.

[0052] Reference signs:

[0053] 10, intervention sheath; 20, outflow channel;

[0054] 100, sheath body; 101, first transition cavity; 1011, conical surface; 102, second transition cavity; 103, third transition cavity; 104, fourth transition cavity; 105, first outlet; 106, second outlet; 110, perfusion line; 120, return line; 130, accommodation cavity; 131, proximal accommodation cavity; 132, distal accommodation cavity; 140, extension cavity; 150, fifth transition cavity; 160, sixth transition cavity; 170, power cavity;

[0055] 200, transmission assembly; 210, first transmission shaft; 220, second transmission shaft; 221, first sub-shaft; 222, second sub-shaft; 223, third sub-shaft; 230, impeller; 231, impeller shaft; 232, impeller body;

[0056] 300, first bearing; 310, flow channel; 311, first inner circumferential surface; 312, first outer circumferential surface;

[0057] 400, placeholder assembly; 401, first placeholder; 410, third sub-piece; 420, fourth sub-piece; 430, third placeholder; 431, first surface; 432, first sub-piece; 433, second sub-piece; 440, fourth placeholder; 450, fifth placeholder; 451, notch; 480, eighth placeholder; 481, second surface; 490, ninth placeholder; 491, third surface;

[0058] 501, flow channel; 502, second inner circumferential surface; 503, second outer circumferential surface; 500, first pipe; 510, second pipe; 520, third pipe; 530, fourth pipe

[0059] 600, first plug; 610, second plug

[0060] x, first direction. DETAILED DESCRIPTION

[0061] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. To make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. The present application can be implemented without some of these specific details for those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0062] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by an "includes" statement does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0063] To solve the technical problems involved in the background art, the applicant proposes a blood pumping device, which comprises an interventional sheath and an outflow channel. The interventional sheath comprises a sheath body, a transmission assembly, a first bearing and a space-occupying assembly. The sheath body is internally provided with a containing cavity and a perfusion pipeline which are independent of each other and communicate with each other. The transmission assembly is at least partially located in the containing cavity. The first bearing is located in the containing cavity and connected with the sheath body. The first bearing is sleeved on the transmission assembly. The first bearing is internally provided with a flow channel for circulating perfusion liquid. The space-occupying assembly comprises at least one space-occupying member located in the containing cavity. A flow channel is formed between the space-occupying member or at least one of the space-occupying member, the sheath body, the transmission assembly and the first bearing, and the flow channel communicates with the perfusion pipeline and the flow channel. The one-side displacement dimension of the flow channel relative to the flow channel is less than or equal to the radial dimension of the flow channel.

[0064] The flow channel can include a first inner circumferential surface facing the transmission assembly and a first outer circumferential surface facing away from the transmission assembly, and the spacing between the first inner circumferential surface and the first outer circumferential surface is the radial dimension of the flow channel. The flow passage includes a second inner circumferential surface facing the transmission assembly and a second outer circumferential surface facing away from the transmission assembly. The single-sided offset dimension can be the spacing between the second inner circumferential surface and the first inner circumferential surface, or the spacing between the second outer circumferential surface and the first outer circumferential surface. The single-sided offset dimension is less than or equal to the radial dimension of the flow channel.

[0065] It should be noted that the radial dimension can be understood as the width of the passage. When the passage is a cylindrical passage, the cross-sectional shape in the axial direction is a circle, and the radial dimension of the passage is the diameter of the circle. When the passage is a circular ring passage, the cross-sectional shape in the axial direction is a circular ring, and the radial dimension of the passage is the spacing between the inner circumferential surface and the outer circumferential surface of the circular ring. When the passage is a circular conical ring passage, although the cross-sectional shape in the axial direction is also a circular ring, since the inner circumferential surface and the outer circumferential surface are both conical surfaces, the normal line perpendicular to the conical surface is not perpendicular to the axis of the conical surface. The radial dimension of the passage is the spacing between the inner circumferential surface and the outer circumferential surface in the radial direction perpendicular to the axis.

[0066] The intervention sheath provided by the present application further provides a space occupying member in the accommodating cavity for accommodating the first bearing, which occupies the excess space in the accommodating cavity and reduces the residual air bubbles in the perfusion and drainage passage. The flow passage is formed between the space occupying member or at least one of the space occupying member, the sheath body, the transmission assembly, and the first bearing, and is in communication with the perfusion passage and the flow channel. The offset dimension of the flow passage with respect to the flow channel is less than or equal to the radial dimension of the flow channel, which reduces the difference in radial dimension between the flow channel and other passages in the accommodating cavity, reduces the resistance to the perfusion fluid flowing through the flow channel and the flow passage, and thus improves the flowability of the perfusion fluid in the accommodating cavity and reduces the stagnation of the perfusion fluid in the accommodating cavity. By optimizing the perfusion and drainage path and filling the exhaust dead zone on the perfusion and drainage path with the space occupying assembly, the structure reduces the exhaust dead zone and reduces the risk of blood backflow into the intervention sheath and air bubbles entering the human body.

[0067] It can be understood that the intervention sheath in the present application can be applied to blood pumping devices, tissue fluid pumping devices, digestive fluid pumping devices, etc. to achieve the purpose of pumping blood, tissue fluid, digestive fluid, etc. For the sake of understanding and description, the following will continue to take the application of the intervention sheath in the blood pumping device as an example for description.

[0068] First, the overall structure of the blood pumping device will be briefly described in conjunction with the drawings to facilitate understanding of the working environment of the blood pumping device. Figure 1 is a longitudinal sectional view of the distal end of the outflow channel and the intervention sheath of some embodiments of the present application, Figure 7 is a partial longitudinal sectional view of the proximal end of an example of the intervention sheath. In conjunction withFigure 1 and Figure 7 It can be known that the application provides a blood pumping device, which comprises an intervention sheath 10, an outflow channel 20 and a motor (not shown). The motor is of an extracorporeal driving type or an intracorporeal driving type, which is distinguished by whether the motor is located in the patient's body or outside the patient's body when the blood pumping device is used. The blood pumping device provided by the application is described below by taking the extracorporeal driving type as an example.

[0069] As shown in Figure 1 , in the blood pumping device, the outflow channel 20 is connected with the distal end of the intervention sheath 10, and the motor is connected with the proximal end of the intervention sheath 10. The intervention sheath 10 comprises a sheath body 100 and a transmission assembly 200. The motor is connected with the transmission assembly 200 for outputting a torque to the transmission assembly 200 to drive the transmission assembly 200 to rotate. The transmission assembly 200 extends from the proximal end to the distal end, and the distal end of the transmission assembly 200 extends into the outflow channel 20. The outflow channel 20 is provided with an inlet and an outlet. The sheath body 100 covers the transmission assembly 200 to isolate the transmission assembly 200 from the blood circulation system of the patient. The sheath body 100 is further provided with a perfusion pipeline 110 and a backflow pipeline 120 which are relatively isolated and interconnected. The perfusion pipeline 110 is used for conveying perfusion liquid to the distal end of the intervention sheath 10 to maintain a certain pressure at the distal end of the intervention sheath 10, so as to avoid the blood flowing into the intervention sheath 10 from the distal end of the intervention sheath 10. The backflow pipeline 120 is used for discharging the perfusion liquid in the intervention sheath 10.

[0070] In the use process of the blood pumping device, the outflow channel 20 is pushed by the intervention sheath 10 to intervene the blood vessels of the patient until the outflow channel is located at a designated position of the blood circulation system of the patient. At this time, the outlet and the inlet are located at different positions of the blood circulation system, while the motor and the proximal end of the intervention sheath 10 are still located outside the patient's body. When the motor is started, the motor drives the transmission assembly 200 to rotate, so that the blood flows into the outflow channel from the inlet and flows out from the outlet, thereby realizing the blood pumping function of the blood pumping device. At the same time, an infusion pump outside the body continuously pumps the perfusion liquid into the perfusion pipeline 110 to the distal end of the sheath body 100, so that the distal end of the sheath body 100 maintains a certain pressure, thereby avoiding the blood in the blood vessels from entering the sheath body 100 and coagulating to form a blood clot. The perfusion liquid at the distal end of the sheath body 100 flows out of the body through the backflow pipeline 120.

[0071] In some other embodiments, different from the previous embodiment, the sheath body 100 is provided with a perfusion line 110, but not provided with a backflow line 120. The perfusion line 110 extends from the proximal end to the distal end of the intervention sheath 10 and communicates with the outflow channel 20, so that the perfusion fluid flows into the intervention sheath 10 from the proximal end and flows out from the distal end by means of the perfusion line 110, and finally flows into the patient's blood vessel through the outflow channel 20. The perfusion fluid in this embodiment also plays a role in maintaining a certain pressure at the distal end of the intervention sheath 10, so as to prevent blood from flowing into the intervention sheath 10 from the distal end of the intervention sheath 10.

[0072] In some other embodiments, different from the previous embodiment, the blood pumping device further comprises an inflow channel connected to the distal end of the outflow channel, and the two form a blood flow channel inside. The inflow channel is provided with a suction port communicating with the flow channel. In use, the inflow channel and the outflow channel 20 are pushed through the patient's blood vessel by the intervention sheath 10 until they reach the designated position in the patient's blood circulation system. At this time, the outflow port and the suction port are located at different positions in the blood circulation system, while the motor and the proximal end of the intervention sheath 10 are still outside the patient's body. When the motor is started, the motor drives the transmission assembly 200 to rotate, thereby causing the blood to flow from the suction port into the flow channel and flow out from the outflow port, realizing the blood pumping function of the blood pumping device. At the same time, the extracorporeal infusion pump continuously pumps the perfusion fluid into the perfusion line 110 to the distal end of the sheath body 100, so that a certain pressure is maintained at the distal end of the sheath body 100, preventing blood in the blood vessel from entering the sheath body 100 and coagulating to form a blood clot. The perfusion fluid at the distal end of the sheath body 100 flows out of the body through the backflow line 120.

[0073] In some other embodiments, the blood pumping device further comprises an elastic hose, the proximal end of the elastic hose is connected to the distal end of the outflow channel, and the distal end of the elastic hose is connected to the proximal end of the inflow channel, the inflow channel, the elastic hose and the outflow channel together form a flow channel inside. Its working principle is the same as the previous embodiment, which will not be described here.

[0074] The perfusion fluid comprises at least one of physiological saline, anticoagulant and glucose, and the anticoagulant can be heparin. The anticoagulant in the perfusion fluid reduces the probability of blood coagulation, thereby reducing the probability of blood pumping failure caused by blood coagulation of the motor.

[0075] It can be understood that in this application, the proximal end refers to the end towards the operator or physician, and the distal end refers to the end away from the operator or physician. The proximal end of the intervention sheath 10 is connected to the motor, infusion pump and other extracorporeal devices, and the distal end of the intervention sheath 10 is connected to the outflow channel 20.

[0076] After the overall structure of the blood pumping device is described, the interventional sheath 10 provided by the embodiments of the present application is described below in conjunction with the drawings. In the description, the line extending along the proximal end and the distal end of the interventional sheath 10 in the drawings, and the direction from the distal end to the proximal end is the first direction, denoted as x. In the drawings, the size in the drawings is not necessarily proportional to the actual size for the convenience of drawing. Among them, Figure 1 The arrow on the right side represents the flow direction of the perfusion liquid.

[0077] Figure 2 A partial longitudinal cross-sectional view of the outflow channel and the distal end of the interventional sheath is shown after the placeholder assembly is hidden; Figure 3 A partial longitudinal cross-sectional view of the outflow channel and the distal end of the interventional sheath is shown after the placeholder assembly is hidden; Figure 1 A partial enlarged view of the outflow channel and the distal end of the interventional sheath at position A.

[0078] In conjunction with Figures 1 to 3 It can be seen that the interventional sheath 10 comprises a sheath body 100, a transmission assembly 200, a first bearing 300, and a placeholder assembly 400, the sheath body 100 is internally provided with a perfusion pipeline 110 and a containing cavity 130 which are independent and communicated with each other, and the transmission assembly 200 is at least partially located in the containing cavity 130. The first bearing 300 is located in the containing cavity 130 and connected with the sheath body 100, the first bearing 300 is sleeved on the transmission assembly 200, the first bearing 300 is internally provided with a flow channel 310 for circulating the perfusion liquid, and the placeholder assembly 400 comprises at least one placeholder located in the containing cavity 130, and the placeholder forms a circulation pipeline 501 communicated with the perfusion pipeline 110 and the flow channel 310. Alternatively, the placeholder forms the circulation pipeline 501 communicated with the perfusion pipeline 110 and the flow channel 310 between the placeholder and at least one of the sheath body 100, the transmission assembly 200, and the first bearing 300. The one-side misalignment dimension of the circulation pipeline 501 relative to the flow channel 310 is less than or equal to the radial dimension of the flow channel 310. It can be understood that the one-side misalignment dimension of the circulation pipeline 501 relative to the flow channel 310 refers to the distance between the opposite surfaces of the circulation pipeline 501 and the flow channel 310 in the radial direction of the cross section, which represents the deviation degree of the size and the misalignment degree of the position of the circulation pipeline 501 relative to the flow channel 310.

[0079] In some embodiments, the flow channel 310 comprises a first inner peripheral surface 311 facing the transmission assembly 200 and a first outer peripheral surface 312 away from the transmission assembly 200, and the spacing between the first inner peripheral surface 311 and the first outer peripheral surface 312 is the radial dimension of the flow channel 310. Figure 3The flow passage 501 includes a second inner circumferential surface 502 facing the transmission assembly 200 and a second outer circumferential surface 503 facing away from the transmission assembly 200, and the distance between the second inner circumferential surface 502 and the first inner circumferential surface 311 and the distance between the second outer circumferential surface 503 and the first outer circumferential surface 312 are both less than or equal to the radial dimension L1 of the flow channel 310.

[0080] In different specific embodiments, the perfusion liquid can flow through the flow channel 310 first, then through the flow passage 501 and then flow out of the accommodation cavity 130, or the perfusion liquid can flow through the flow passage 501 first, then through the flow channel 310 and then flow out of the accommodation cavity 130.

[0081] In some embodiments, the sheath body 100 and the transmission assembly 200 both extend along the first direction x, and at least part of the perfusion passage 110 is an annular cavity extending along the first direction x.

[0082] For the convenience of drawing and description, the x direction in the figure is a straight line direction, but in fact the interventional sheath 10 has a certain bending performance, which facilitates the interventional sheath 10 to be inserted into the blood vessel, so the extension direction of the central axis of the interventional sheath 10 can also be curved.

[0083] In some embodiments, the sheath body 100 can be a cylindrical tube, or a polygonal tube structure such as a square tube. The present embodiment takes the sheath body 100 as a cylindrical tube as an example.

[0084] It is explained that the transmission assembly 200 is an axisymmetric figure, has a central axis, and the direction in which the central axis extends is consistent with the direction of the line connecting the proximal end and the distal end of the interventional sheath 10, that is, the direction x in the figure. The first bearing sleeve is sleeved on the transmission assembly 200, and the occupying member can be a cylindrical structure sleeved on the transmission assembly 200, or a component independently provided with the transmission assembly 200. Taking the cylindrical structure sleeved on the transmission assembly 200 as an example, it has two circumferential surfaces, the circumferential surface of the outer wall of the cylinder is the outer circumferential surface, and the circumferential surface of the inner wall of the cylinder is the inner circumferential surface. In addition, the axial direction of the cylindrical structure refers to the direction in which the central axis extends, the circumferential direction refers to the circumferential direction of the outer periphery of the cylinder, the radial direction refers to the direction in the radial plane through the central axis, and usually refers to the straight line direction along the diameter or radius, or the straight line direction perpendicular to the central axis. The radial dimension generally refers to the radius or diameter of the axisymmetric part, and in the pipeline it can be understood as the width of the pipeline, for example, the flow channel 310 in the present embodiment is a circular annular pipeline, and the cross-sectional shape of the pipeline in the axial direction is a circular ring, and the radial dimension of the pipeline is the distance L1 between the inner circumferential surface and the outer circumferential surface of the circular ring. It can be understood that in the present application, the axial direction, the circumferential direction, the radial direction, and the circumferential surface of other components can refer to the above description of the cylindrical structure.

[0085] The first bearing 300 is used to connect the transmission assembly 200 and the sheath body 100, so that the transmission assembly 200 can rotate relative to the sheath body 100. Since the accommodation cavity 130 needs to accommodate the first bearing 300, the axial cross-sectional area of the accommodation cavity 130 is larger than the axial cross-sectional area of other cavities in the perfusion and reflux pipeline in the sheath body 100. In order to improve the versatility of the sheath body 100, and considering the process limitations in manufacturing the accommodation cavity 130, the difficulty of installing the first bearing 300, and other factors, it is difficult for the accommodation cavity 130 to be only slightly larger than the first bearing 300, and there is no excess cavity after removing the space occupied by the first bearing 300. Therefore, the accommodation cavity 130 still has a relatively large cavity after removing the space occupied by the first bearing 300 and part of the transmission assembly 200. Since the first bearing 300 is arranged in the accommodation cavity 130, the first bearing 300 also causes the radial dimension of the perfusion liquid flow path in the accommodation cavity 130 to suddenly change, which makes it easy for bubbles to remain and perfusion liquid to stagnate in the accommodation cavity 130.

[0086] The pump blood device provided by the embodiment can reduce the wear of the first bearing 300 by arranging the perfusion pipeline 110 in communication with the accommodation cavity 130, so that the perfusion liquid can carry away the heat generated by the first bearing 300 and the microparticles generated by rotation when the perfusion liquid flows through the first bearing 300 in the accommodation cavity 130, thereby improving the service life of the intervention sheath 10. The excess cavity in the accommodation cavity 130 is occupied by the space occupying member, which reduces the bubble remaining in the perfusion and drainage pipeline. The flow-through pipeline 501 in the space occupying member or between the space occupying member and at least one of the sheath body 100, the transmission assembly 200, and the first bearing 300 is in communication with the perfusion pipeline 110 and the flow channel 310. The flow-through pipeline 501 includes a second inner circumferential surface 502 and a second outer circumferential surface 503, and the distance between the second inner circumferential surface 502 and the first inner circumferential surface 311 and the distance between the second outer circumferential surface 503 and the first outer circumferential surface 312 are both less than or equal to the radial dimension L1 of the flow channel 310. The radial dimension difference between the flow channel 310 and other pipelines in the accommodation cavity 130 is reduced, the flow of the perfusion liquid in the accommodation cavity 130 is improved, and the stagnation of the perfusion liquid in the accommodation cavity 130 is reduced. By optimizing the perfusion and drainage path, the exhaust dead zone on the perfusion and drainage path is filled and covered by the space occupying assembly 400. This structure reduces the exhaust dead zone and reduces the risk of blood flowing back into the intervention sheath and bubbles entering the human body.

[0087] In some embodiments, the minimum distance between the center line of the flow channel 310 and the center line of the flow passage 501 is less than or equal to the radial dimension L1 of the flow channel 310. Here, the minimum distance between the center line of the flow channel 310 and the first inner circumferential surface 311 and the first outer circumferential surface 312 is equal, and the minimum distance between the center line of the flow passage 501 and the second inner circumferential surface 502 and the second outer circumferential surface 503 is equal.

[0088] It should be noted that the center line of the passage is not the same concept as the axis. The center line is a set of points located in the passage and radially equidistant from the surface of the passage. When the passage is a standard circle, a standard ring, or a standard sector, the center line is equidistant from the surface of the passage. The axis is used to represent the axis of a rotating body or a symmetrical body. When the passage is a standard circle, a standard ring, or a standard sector, the axis is a set of corresponding circle centers. When the passage is a cylindrical cavity, the center line is coplanar with the axis. When the passage is a circular ring cavity, the axis is a line passing through the center of the inner circumferential surface of the circular ring, and the center line is a line parallel to the axis on the circumferential surface between the inner circumferential surface and the outer circumferential surface of the circular ring. In other words, the center line of the circular ring passage forms a circumferential surface between the inner circumferential surface and the outer circumferential surface.

[0089] In some optional embodiments, the flow channel 310 and the flow passage 501 are both annular passages arranged around the transmission assembly 200, the axis of the flow channel 310 is parallel to the axis of the flow passage 501, and the distance between the axis of the flow channel 310 and the axis of the flow passage 501 is less than or equal to the radial dimension of the flow channel 310. Since the first bearing 300 is sleeved on the transmission assembly 200 and connected to the transmission assembly 200, it is generally considered that the axis of the flow channel 310 coincides with the axis of the transmission assembly 200. In this embodiment, by making the distance between the axis of the flow channel 310 and the axis of the flow passage 501 less than or equal to the radial dimension of the flow channel 310, the misalignment between the flow channel 310 and the flow passage 501 is reduced, the flow of the perfusion liquid in the containing cavity 130 is facilitated, and the residence of the perfusion liquid in the containing cavity 130 is reduced.

[0090] In some optional embodiments, the axis of the flow channel 310 is collinear with the axis of the flow passage 501. However, the radial dimension of the flow channel 310 and the radial dimension of the flow passage 501 are not necessarily the same, so the circumferential surface formed by the center line of the flow channel 310 and the circumferential surface formed by the center line of the flow passage 501 are not necessarily coplanar.

[0091] In some alternative embodiments, the axis of the flow passage 310 is collinear with the axis of the flow passage tube 501, and the circumferential surface formed by the center line of the flow passage 310 intersects or is coplanar with the circumferential surface formed by the center line of the flow passage tube 501. When the axis of the flow passage 310 is collinear with the axis of the flow passage tube 501, and the circumferential surface formed by the center line of the flow passage 310 is coplanar with the circumferential surface formed by the center line of the flow passage tube 501, the radial dimension of the flow passage tube 501 is equal to the radial dimension L1 of the flow passage 310, and the included angle between the first inner circumferential surface 311 and the second inner circumferential surface 502 is 180°, and the included angle between the first outer circumferential surface 312 and the second outer circumferential surface 503 is 180°. When the axis of the flow passage 310 is collinear with the axis of the flow passage tube 501, and the circumferential surface formed by the center line of the flow passage 310 intersects the circumferential surface formed by the center line of the flow passage tube 501, the included angle between the first inner circumferential surface 311 and the second inner circumferential surface 502 is greater than 90° and less than 180°, and the included angle between the first outer circumferential surface 312 and the second outer circumferential surface 503 is greater than 90° and less than 180°.

[0092] In the present embodiment, by setting the included angle between the first inner circumferential surface 311 and the second inner circumferential surface 502 to an obtuse angle, and setting the included angle between the first outer circumferential surface 312 and the second outer circumferential surface 503 to an obtuse angle, the flow dead zone and blind area of the flow region are reduced, the perfusion fluid in the containing cavity 130 is less hindered when flowing through the flow passage 310 and the flow passage tube 501, and the impact on the flow passage wall surface is reduced, thereby improving the flowability of the perfusion fluid in the containing cavity 130. It can be understood that in the present application, the two characteristic included angles related to the flow region are set to obtuse angles, and similar functions can generally be achieved, which will not be described again below.

[0093] In some alternative embodiments, the first inner circumferential surface 311 is connected to the second inner circumferential surface 502, the first outer circumferential surface 312 is connected to the second outer circumferential surface 503, and the radial dimension of the flow passage tube 501 is equal to the radial dimension of the flow passage 310. It can be understood that when two surfaces are connected and the included angle between the two surfaces is 180°, the two surfaces can be considered to be flush.

[0094] The blood pumping device provided in the present embodiment not only has the flow passage 310 and the flow passage tube 501 directly connected, but also has the radial dimension of the flow passage 310 and the flow passage tube 501 equal, and the surfaces connected by the flow passage 310 and the flow passage tube 501 flush or at an obtuse angle, thereby reducing the flow dead zone and blind area of the flow region, further reducing the hindrance of the perfusion fluid in the containing cavity 130 when flowing through the flow passage 310 and the flow passage tube 501, and thereby improving the flowability of the perfusion fluid in the containing cavity 130.

[0095] Figure 4 A longitudinal sectional view of an example first bearing is shown.

[0096] As Figures 1 to 4As shown, in some embodiments, the first inner circumferential surface 311 is connected with the second inner circumferential surface 502, and the distance between the first inner circumferential surface 311 and the first outer circumferential surface 312 in the radial direction of the interventional sheath 10 is equal to the distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 in the radial direction of the interventional sheath 10.

[0097] The first bearing 300 can be a rolling bearing or a sliding bearing, etc. The flow channel 310 can be approximately regarded as a circular annular cavity arranged around the transmission assembly 200, and the flow channel 310 extends along the first direction x. Depending on the type of the first bearing 300, the specific form of the flow channel 310 can deviate from the circular annular cavity, and therefore the first inner circumferential surface 311 and the first outer circumferential surface 312 defined in the embodiment do not necessarily refer to physical surfaces, but can also refer to virtual surfaces on the side of the flow channel 310 facing the transmission assembly 200 and the side of the flow channel 310 facing away from the transmission assembly 200, respectively. In the embodiment, the flow channel 310 is taken as an example of a circular annular cavity. The normal line of the first inner circumferential surface 311 and the first outer circumferential surface 312 is perpendicular to the axis of the interventional sheath 10, and the distance L1 between the first inner circumferential surface 311 and the first outer circumferential surface 312 in the radial direction of the interventional sheath 10 is equal to the minimum distance between the first inner circumferential surface 311 and the first outer circumferential surface 312 (the distance on the normal line perpendicular to the first inner circumferential surface 311). The distance L1 can be defined as the width of the flow channel 310.

[0098] It should be noted that the flow passage 501 is directly communicated with the flow channel 310 of the at least one first bearing 300, and the flow passage 501 is also approximately regarded as a circular annular cavity arranged around the transmission assembly 200, and the definitions of the second inner circumferential surface 502 and the second outer circumferential surface 503 can be referred to the definitions of the first inner circumferential surface 311 and the first outer circumferential surface 312, respectively. However, the normal line of the second inner circumferential surface 502 and the second outer circumferential surface 503 is not necessarily perpendicular to the axis of the interventional sheath 10. When the normal line of the second inner circumferential surface 502 and the second outer circumferential surface 503 is perpendicular to the axis of the interventional sheath 10, the distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 in the radial direction of the interventional sheath 10 is equal to the minimum distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 (the distance on the normal line perpendicular to the second inner circumferential surface 502). When the normal line of the second inner circumferential surface 502 and the second outer circumferential surface 503 is not perpendicular to the axis of the interventional sheath 10, the second inner circumferential surface 502 and the second outer circumferential surface 503 can be regarded as conical surfaces arranged around the axis of the interventional sheath 10. At this time, the distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 in the radial direction of the interventional sheath 10 is greater than the minimum distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 (the distance on the normal line perpendicular to the second inner circumferential surface 502).

[0099] In some embodiments, the first inner circumferential surface 311 is connected with the second inner circumferential surface 502, and the included angle between the first inner circumferential surface 311 and the second inner circumferential surface 502 is greater than 90° and less than or equal to 180°. The first outer circumferential surface 312 is connected with the second outer circumferential surface 503, and the included angle between the first outer circumferential surface 312 and the second outer circumferential surface 503 is greater than 90° and less than or equal to 180°. It can be understood that when two surfaces are connected and the included angle between the two surfaces is 180°, the two surfaces can be considered to be flush.

[0100] The pump blood device provided by the embodiment reduces the flow dead zone and blind area of the flow area, further reduces the obstruction of the perfusion fluid in the containing cavity 130 when flowing through the flow channel 310 and the flow passage 501, and thus improves the flowability of the perfusion fluid in the containing cavity 130.

[0101] In some embodiments, the containing cavity 130 includes a bearing containing cavity, and the first bearing 300 is located in the bearing containing cavity. The occupying assembly 400 includes a first occupying member 401 located in the bearing containing cavity, and the first occupying member 401 is provided with a first pipeline 500 in communication with the perfusion pipeline 110, and the radial dimension of the first pipeline 500 is equal to the radial dimension of the flow channel 310.

[0102] The definition of the first pipeline 500 can refer to the flow passage 501 described above.

[0103] In some embodiments, two first bearings 300 are provided in the same bearing containing cavity and are arranged in the axial direction of the transmission assembly 200, and the radial dimensions of the two first bearings 300 located in the same bearing containing cavity are equal, and the dimensions of the flow channels 310 are also the same. The first occupying member 401 is located between the two first bearings 300, and the proximal end and the distal end of the first occupying member 401 abut against the two first bearings 300, respectively. When the perfusion fluid of the perfusion pipeline 110 flows into the bearing containing cavity, it first flows through the flow channel 310 of one of the first bearings 300, and then flows through the first pipeline 500 and the flow channel 310 of the other first bearing 300 in turn, and then flows out of the bearing containing cavity.

[0104] The pump blood device provided by the embodiment improves the support of the first bearing 300 to the transmission assembly 200 by simultaneously providing two first bearings 300 in the bearing containing cavity, reduces the vibration amplitude of the intervention sheath 10 when the pump blood device is running, and thus reduces the damage of the intervention sheath 10 to the blood vessels of the patient.

[0105] Figure 5 A transverse cross-sectional schematic view of an example first occupying member is shown.

[0106] like Figures 1 to 5 As shown, in some embodiments, the first placeholder 401 includes a third sub-component 410 and a fourth sub-component 420. The third sub-component 410 is sleeved outside the transmission assembly 200, and the fourth sub-component 420 is sleeved outside the third sub-component 410. The gap between the third sub-component 410 and the fourth sub-component 420 forms the first pipeline 500. The distance between the outer circumference of the third sub-component 410 and the inner circumference of the fourth sub-component 420 in the radial direction of the interventional sheath 10 is equal to the radial dimension of the flow channel 310.

[0107] The third sub-component 410 and the fourth sub-component 420 are both circular rings, and the axial dimensions of the third sub-component 410 and the fourth sub-component 420 are equal.

[0108] In some embodiments, the proximal end and the distal end of the third sub-element 410 respectively abut against the two first bearings 300 , and the proximal end and the distal end of the fourth sub-element 420 respectively abut against the two first bearings 300 .

[0109] In some embodiments, the outer circumference of the third sub-component 410 is connected to the first inner circumference 311, and the angle between the outer circumference of the third sub-component 410 and the first inner circumference 311 is equal to 180°. The inner circumference of the fourth sub-component 420 is connected to the first outer circumference 312, and the angle between the inner circumference of the fourth sub-component 420 and the first outer circumference 312 is equal to 180°. The normals of the outer circumference of the third sub-component 410 and the inner circumference of the fourth sub-component 420 are both perpendicular to the axis of the interventional sheath 10, and the radial distance between the outer circumference of the third sub-component 410 and the inner circumference of the fourth sub-component 420 in the interventional sheath 10 is equal to the minimum distance between the outer circumference of the third sub-component 410 and the inner circumference of the fourth sub-component 420 (the distance perpendicular to the normal of the outer circumference of the third sub-component 410). The distance between the outer circumference of the third sub-component 410 and the inner circumference of the fourth sub-component 420 in the radial direction of the interventional sheath 10 can be defined as the width of the first pipeline 500 ( Figure 5 Dimension L2 in the figure), the width L1 of the flow channel 310 is equal to the width L2 of the first pipeline 500, and the first inner circumferential surface 311 of the flow channel 310 is flush with the outer circumferential surface of the third sub-component 410, and the first outer circumferential surface 312 of the flow channel 310 is flush with the inner circumferential surface of the fourth sub-component 420.

[0110] The blood pumping device provided in this embodiment reduces radial dimensional variation of the perfusate flow path within the accommodating chamber 130 by aligning the first inner circumferential surface 311 of the flow channel 310 with the outer circumferential surface of the third sub-component 410 and the first outer circumferential surface 312 of the flow channel 310 with the inner circumferential surface of the fourth sub-component 420. This improves the fluidity of the perfusate within the accommodating chamber 130 and thereby reduces retention of the perfusate within the accommodating chamber 130.

[0111] Figure 6A schematic longitudinal cross-sectional view of an eighth placeholder and a ninth placeholder according to an example is shown.

[0112] like Figures 1 to 6 As shown, in some embodiments, the accommodating cavity 130 further includes a sixth transition cavity 160, which communicates with the bearing accommodating cavity. The radial dimension of the sixth transition cavity 160 is smaller than the radial dimension of the bearing accommodating cavity to which it is directly connected. The placeholder assembly 400 further includes an eighth placeholder 480 and a ninth placeholder 490 located in the sixth transition cavity 160. The eighth placeholder 480 is disposed outside the transmission assembly 200, and the ninth placeholder 490 is disposed outside the eighth placeholder 480. The eighth placeholder 480 has a second surface 481 facing away from the transmission assembly 200, while the ninth placeholder 490 has a third surface 491 facing toward the transmission assembly 200. The distances between the second surface 481 and the axis of the transmission assembly 200, and the distances between the third surface 491 and the axis of the transmission assembly 200, both gradually decrease in a direction away from the accommodating cavity 130. The gap between the second surface 481 and the third surface 491 forms a third conduit 520 that communicates with the flow channel 310.

[0113] The sixth transition chamber 160 and the bearing accommodating chamber are both cylindrical cavities, and the radial dimension of the sixth transition chamber 160 is smaller than the radial dimension of the bearing accommodating chamber to which it is directly connected. The sixth transition chamber 160 can be located at the proximal or distal end of the accommodating chamber 130. The second surface 481 and the third surface 491 can be understood as conical surfaces, and the third conduit 520 is a conical annular conduit disposed around the transmission assembly 200. When the sixth transition chamber 160 is located proximal to the bearing accommodating chamber to which it is directly connected, the spacing between the second surface 481 and the third surface 491 and the axis of the transmission assembly 200 gradually decreases from the distal end to the proximal end. When the sixth transition chamber 160 is located distal to the bearing accommodating chamber to which it is directly connected, the spacing between the second surface 481 and the third surface 491 and the axis of the transmission assembly 200 gradually decreases from the proximal end to the distal end. It can be understood that the third pipeline 520 formed by the gap between the second surface 481 and the third surface 491 gradually moves toward the axis of the transmission assembly 200 in a direction away from the bearing accommodating cavity directly connected thereto.

[0114] Since the accommodating chamber 130 is provided with the flow channel 310 and the first pipeline 500 that are in communication with each other, the third pipeline 520 is in direct or indirect communication with the flow channel 310 and the first pipeline 500 .

[0115] In some embodiments, the distance between the second surface 481 and the third surface 491 in the radial direction of the interventional sheath 10 is ( Figure 6The second surface 481 is connected with the first inner circumferential surface 311, and the included angle between the second surface 481 and the first inner circumferential surface 311 is greater than 90° and less than 180°. The third surface 491 is connected with the first outer circumferential surface 312, and the included angle between the third surface 491 and the first outer circumferential surface 312 is greater than 90° and less than 180°.

[0116] It is to be explained that, since the normal lines of the second surface 481 and the third surface 491 are not perpendicular to the axis of the intervention sheath 10, the spacing L3 of the second surface 481 and the third surface 491 in the radial direction of the intervention sheath 10 is greater than the minimum spacing (the spacing in the normal line of the second surface 481, Figure 6 The dimension L6 in the sixth transition cavity 160). The blood pumping device provided by the embodiment reduces the vortex generated when the perfusion fluid directly flows between the larger radial dimension of the accommodation cavity 130 and the smaller radial dimension of the perfusion and drainage pipeline, thereby reducing the retention of the perfusion fluid in the accommodation cavity 130. By making the spacing L3 of the second surface 481 and the third surface 491 in the radial direction of the intervention sheath 10 equal to the width L1 of the flow channel 310, the widths of the connected third pipeline 520, flow channel 310 and first pipeline 500 are uniform, improving the flowability of the perfusion fluid flowing through the third pipeline 520, flow channel 310 and first pipeline 500. By connecting the second surface 481 with the first inner circumferential surface 311 and the third surface 491 with the first outer circumferential surface 312, and making the included angles between the second surface 481 and the first inner circumferential surface 311 and between the third surface 491 and the first outer circumferential surface 312 obtuse, the flow of the perfusion fluid through the third pipeline 520 and the flow channel 310 is reduced, and the impact of the perfusion fluid on the pipeline is reduced, further improving the flowability of the perfusion fluid.

[0117] Figure 7 A partial longitudinal cross-sectional view of the proximal end of an example intervention sheath is shown; Figure 8 A partial longitudinal cross-sectional view of the proximal end of an example intervention sheath is shown; Figure 7 The arrow in the upper right corner represents the flow direction of the perfusion fluid

[0118] As Figures 1 to 8As shown, in some embodiments, the bearing accommodating cavities include a proximal accommodating cavity 131 and a distal accommodating cavity 132. The sheath body 100 is further provided with an extension cavity 140 extending from the proximal end to the distal end, which directly or indirectly communicates with the proximal accommodating cavity 131 and the distal accommodating cavity 132. At least part of the transmission assembly 200 extends from the proximal accommodating cavity 131 to the distal accommodating cavity 132 through the extension cavity 140, and at least one first bearing 300 is arranged in each of the proximal accommodating cavity 131 and the distal accommodating cavity 132. At least one of the proximal accommodating cavity 131 and the distal accommodating cavity 132 is provided with a third sub-member 410 and a fourth sub-member 420.

[0119] The proximal accommodating cavity 131 is located at the proximal end of the sheath body 100, and the distal accommodating cavity 132 is located at the distal end of the sheath body 100. In use, the proximal accommodating cavity 131 is located outside the patient's body, and the distal accommodating cavity 132 is located in the patient's blood vessel. The transmission assembly 200 extends from the proximal accommodating cavity 131 to the distal accommodating cavity 132 through the extension cavity 140, so that the motor for driving the transmission assembly 200 to rotate can be placed outside the patient's body and connected to the proximal end of the transmission assembly 200.

[0120] In some embodiments, the proximal accommodating cavity 131 and the distal accommodating cavity 132 are each provided with a third sub-member 410, a fourth sub-member 420, and two first bearings 300. The sheath body 100 is provided with two sixth transition cavities 160, one of which is located at the distal end of the distal accommodating cavity 132 and directly communicates with the distal accommodating cavity 132, and the other is located at the distal end of the proximal accommodating cavity 131 and communicates with the proximal accommodating cavity 131 and the extension cavity 140. The radial dimensions of the first bearings 300 in the proximal accommodating cavity 131 and the distal accommodating cavity 132 can be the same or different. When the radial dimensions of the first bearings 300 in the proximal accommodating cavity 131 and the distal accommodating cavity 132 are different, the sizes of the first occupying members 401 located in the proximal accommodating cavity 131 and the distal accommodating cavity 132 are adjusted according to the sizes of the first bearings 300 in the bearing accommodating cavities where they are located, and the sizes of the sixth transition cavities 160 directly communicating with the proximal accommodating cavity 131 and the distal accommodating cavity 132 and the eighth occupying members 480 and the ninth occupying members 490 located in the sixth transition cavities 160 are adjusted according to the sizes of the first bearings 300 in the bearing accommodating cavities directly communicating with them.

[0121] The pump blood device provided by the embodiment has the advantages that the motor is external, the radial size of the interventional sheath 10 is smaller than that of the scheme with the internal motor, the interventional difficulty is reduced, and the damage to the patient's blood vessel is reduced. By arranging two first bearings 300 in the proximal accommodating cavity 131 and the distal accommodating cavity 132, the support of the first bearings 300 to the transmission assembly 200 is further improved, the vibration amplitude of the interventional sheath 10 during the operation of the pump blood device is reduced, and the damage of the interventional sheath 10 to the patient's blood vessel is further reduced.

[0122] After describing the bearing accommodating cavity and the sixth transition cavity, several implementations of other cavities in the accommodating cavity will be described below with reference to the accompanying drawings.

[0123] like Figures 1 to 3 As shown, in some embodiments, the accommodating chamber 130 further includes a first transition chamber 101 connecting the distal accommodating chamber 132 and the extension chamber 140. The radial dimension of the distal accommodating chamber 132 is greater than that of the extension chamber 140, and the radial dimension of the outer circumference of the first transition chamber 101 gradually decreases from the distal end to the proximal end. The placeholder assembly 400 further includes a third placeholder 430. The third placeholder 430 has a first surface 431 facing away from the transmission assembly 200, and the distance between the first surface 431 and the axis of the transmission assembly 200 gradually decreases from the distal end to the proximal end. The gap between the first surface 431 and the conical surface 1011 of the first transition chamber 101 forms a fourth conduit 530 connecting the flow channel 310 and the extension chamber 140.

[0124] The first transition chamber 101 is a truncated cone-shaped cavity, and the radial dimension of the outer circumference of the first transition chamber 101 gradually decreases from the distal end to the proximal end. Therefore, the outer circumference of the first transition chamber 101 can be understood as a conical surface 1011. The first surface 431 can also be understood as a conical surface, and the fourth pipeline 530 is a conical annular pipeline.

[0125] In some embodiments, the distance between the conical surface 1011 of the first transition cavity 101 and the first surface 431 in the radial direction of the interventional sheath 10 is ( Figure 3 The dimension L4 in the figure is equal to the radial dimension L1 of the flow channel 310. The first surface 431 is connected to the first inner circumferential surface 311 of the flow channel 310 at the end facing the distal accommodating cavity 132. The conical surface 1011 of the first transition cavity 101 is connected to the first outer circumferential surface 312 of the flow channel 310 at the end facing the distal accommodating cavity 132. The angle between the first surface 431 and the first inner circumferential surface 311 is greater than 90° and less than 180°, while the angle between the conical surface 1011 of the first transition cavity 101 and the first outer circumferential surface 312 is greater than 90° and less than 180°.

[0126] It should be explained that, since the normal of the first surface 431 and the conical surface 1011 of the first transition cavity 101 is not perpendicular to the axis of the interventional sheath 10, the distance L4 between the first surface 431 and the conical surface 1011 of the first transition cavity 101 in the radial direction of the interventional sheath 10 is greater than the minimum distance between the first surface 431 and the conical surface 1011 of the first transition cavity 101 (the distance perpendicular to the normal of the first surface 431, Figure 3 Dimension L7).

[0127] The blood pumping device provided by the embodiment makes the distance L4 between the conical surface 1011 of the first transition cavity 101 and the first surface 431 in the radial direction of the intervention sheath 10 equal to the width L1 of the flow channel 310, so that the width of the connected flow channel 310 and the fourth pipeline 530 is consistent, and the flowability of the perfusion fluid when flowing through the flow channel 310 and the fourth pipeline 530 is improved. By connecting the first surface 431 with the first inner circumferential surface 311 and connecting the conical surface 1011 of the first transition cavity 101 with the first outer circumferential surface 312, and making the included angle between the first surface 431 and the first inner circumferential surface 311 and the included angle between the conical surface 1011 of the first transition cavity 101 and the first outer circumferential surface 312 both obtuse, the perfusion fluid is less hindered when flowing through the fourth pipeline 530 and the flow channel 310, and the impact of the perfusion fluid on the pipeline when flowing through the fourth pipeline 530 and the flow channel 310 is reduced, further improving the flowability of the perfusion fluid.

[0128] In some embodiments, the transmission assembly 200 includes a first transmission shaft 210 and an impeller 230 connected to each other, the first transmission shaft 210 extending from the first transition cavity 101 to the extension cavity 140. The impeller 230 includes an impeller shaft 231 and an impeller body 232 connected to each other, the impeller body 232 extending from the distal end accommodation cavity 132 to the outflow passage 20. At least part of the impeller shaft 231 is sleeved outside the first transmission shaft 210 and extends from the first transition cavity 101 to the distal end accommodation cavity 132 and is connected to the impeller body 232. The radial dimension of the impeller shaft 231 is greater than the radial dimension of the first transmission shaft 210. The third occupying member 430 includes a first sub-member 432 and a second sub-member 433, the first sub-member 432 being sleeved outside the impeller shaft 231, the second sub-member 433 being sleeved outside the first transmission shaft 210, and the first sub-member 432 being located at the distal end of the second sub-member 433. The distance between the first surface 431 of the first sub-member 432 to the axis of the transmission assembly 200 and the distance between the first surface 431 of the second sub-member 433 to the axis of the transmission assembly 200 gradually decrease in the direction from the distal end to the proximal end, and the distance between the first surface 431 of the first sub-member 432 and the conical surface 1011 of the first transition cavity 101 in the radial direction of the intervention sheath 10 is equal to the distance between the first surface 431 of the second sub-member 433 and the conical surface 1011 of the first transition cavity 101 in the radial direction of the intervention sheath 10.

[0129] In some embodiments, the distal end of the second sub-member 433 can partially extend into the extension cavity 140.

[0130] In some embodiments, the sheath body 100 is provided with a second outlet 106 extending axially on the end face of the distal end of the sheath body 100, the second outlet 106 being in communication with the distal end of the distal accommodation cavity 132 and the outflow channel 20. The distal end of the impeller shaft 231 extends out of the distal accommodation cavity 132 and is connected to the impeller body 232 located in the outflow channel 20, and the proximal end of the impeller shaft 231 extends into the first transition cavity 101 and is wrapped around part of the first transmission shaft 210. The perfusion pipeline 110 is in communication with the distal accommodation cavity 132 through the second outlet 106, and most of the perfusion liquid flows into the distal accommodation cavity 132 at the second outlet 106 and flows out of the intervention sheath 10 through the first transition cavity 101 and the backflow pipeline 120, and a small part of the perfusion liquid flows into the outflow channel 20 from the second outlet 106, while maintaining a certain pressure at the second outlet 106 to prevent blood from flowing into the intervention sheath 10 from the second outlet 106 to cause thrombosis.

[0131] In some embodiments, the first transmission shaft 210 is a flexible rotating shaft, and the elasticity of the first transmission shaft 210 is greater than that of the impeller 230. The two first bearings 300 in the distal accommodation cavity 132 are sleeved on the impeller shaft 231 to support the impeller shaft 231.

[0132] The pump blood device provided by the embodiment improves the blood transport capacity of the impeller 230 which is less elastic and more rigid by making the transmission assembly 200 include the first transmission shaft 210 and the impeller 230, the first transmission shaft 210 extending from the first transition cavity 101 to the extension cavity 140, and the elasticity of the first transmission shaft 210 being greater than that of the impeller 230. The first transmission shaft 210 which is more elastic extends from the distal end of the intervention sheath 10 to the proximal end through the extension cavity 140, which not only transmits torque but also improves the elasticity of the intervention sheath 10, thereby reducing the difficulty of the intervention sheath 10 in the intervention of the blood vessels of the patient. The first sub-member 432 and the second sub-member 433 are respectively sleeved outside the impeller 230 and the first transmission shaft 210, and the first sub-member 432 and the second sub-member 433 can fill the cavity caused by the different radial dimensions of the impeller 230 and the first transmission shaft 210, thereby reducing the gas residue in the first transition cavity 101 and reducing the impact of the perfusion liquid on the pipeline when flowing through the flow channel 310 and the first transition cavity 101, and further improving the flowability of the perfusion liquid.

[0133] Figure 9 A partial longitudinal sectional view of a second transmission shaft is shown; Figure 10 An axial sectional view of a fourth occupying member and a fifth occupying member is shown.

[0134] As Figures 7 to 10As shown, in some embodiments, the accommodation cavity 130 further comprises a second transition cavity 102, and the sheath body 100 further comprises a power cavity 170, and the proximal accommodation cavity 131, the second transition cavity 102 and the power cavity 170 are arranged in sequence from the distal end to the proximal end. The transmission assembly 200 further comprises a second transmission shaft 220 coaxially connected with the first transmission shaft 210, and the second transmission shaft 220 extends into the extension cavity 140 from the power cavity 170 through the proximal accommodation cavity 131 and is connected with the first transmission shaft 210. The second transmission shaft 220 comprises a first sub-shaft 221, a second sub-shaft 222 and a third sub-shaft 223 arranged in sequence from the distal end to the proximal end, at least part of the first sub-shaft 221 is located in the proximal accommodation cavity 131, the second sub-shaft 222 is located in the second transition cavity 102, and at least part of the third sub-shaft 223 is located in the power cavity 170. The radial dimension of the second sub-shaft 222 is smaller than the radial dimensions of the first sub-shaft 221 and the third sub-shaft 223. The fourth occupying member 440 and the fifth occupying member 450 are both located in the second transition cavity 102, the fourth occupying member 440 is sleeved outside the second sub-shaft 222, and the fifth occupying member 450 is sleeved outside the fourth occupying member 440. The gap between the fourth occupying member 440 and the fifth occupying member 450 forms a second pipeline 510, and the second pipeline 510 communicates with the flow channel 310 in the proximal accommodation cavity 131.

[0135] The power cavity 170 is used for accommodating a motor for driving the transmission assembly 200 to rotate. The second transmission shaft 220 is a variable-diameter shaft, and the radial dimension of the third sub-shaft 223 is greater than that of the second sub-shaft 222, because the third sub-shaft 223 needs to extend into the power cavity 170 and be connected with the motor. The radial dimension of the first sub-shaft 221 is greater than that of the second sub-shaft 222, because the first sub-shaft 221 needs to extend into the proximal accommodation cavity 131 to bear the first bearing 300, and further extend into the extension cavity 140 to be connected with the first transmission shaft 210.

[0136] In some embodiments, the radial dimensions of the power cavity 170, the second transition cavity 102 and the proximal accommodation cavity 131 are sequentially reduced, because the power cavity 170 needs to accommodate a motor for driving the transmission assembly 200 to rotate, and a larger space is needed for the power cavity 170 to ensure the driving force of the motor.

[0137] In some embodiments, the first sub-shaft 221 is connected with the first transmission shaft 210 through a sleeve or a shaft coupling, and the connection position of the first sub-shaft 221 and the first transmission shaft 210 is located on the side of the extension cavity 140 close to the proximal end, so that the second transmission shaft 220 can be located outside the patient's body when the blood pumping device is used. The elasticity of the first transmission shaft 210 is greater than that of the second transmission shaft 220, which can not only ensure the torque transmission capacity of the second transmission shaft 220, but also reduce the difficulty of the intervention sheath 10 in the intervention of the patient's blood vessel.

[0138] In some embodiments, the fourth space-occupying member 440 and the fifth space-occupying member 450 are both cylindrical structures, and the second conduit 510 is a circular ring-shaped conduit. Since the normal lines of the outer circumferential surface of the fourth space-occupying member 440 and the inner circumferential surface of the fifth space-occupying member 450 are both perpendicular to the axis of the intervention sheath 10, the distance between the outer circumferential surface of the fourth space-occupying member 440 and the inner circumferential surface of the fifth space-occupying member 450 (the radial dimension of the second conduit 510, i.e., the dimension L5 in the figure), can be defined as the width of the second conduit 510, and the width L1 of the flow channel 310 is equal to the width L5 of the second conduit 510. Figure 7 In some embodiments, the fourth space-occupying member 440 and the fifth space-occupying member 450 are both cylindrical structures, and the second conduit 510 is a circular ring-shaped conduit. Since the normal lines of the outer circumferential surface of the fourth space-occupying member 440 and the inner circumferential surface of the fifth space-occupying member 450 are both perpendicular to the axis of the intervention sheath 10, the distance between the outer circumferential surface of the fourth space-occupying member 440 and the inner circumferential surface of the fifth space-occupying member 450 (the radial dimension of the second conduit 510, i.e., the dimension L5 in the figure), can be defined as the width of the second conduit 510, and the width L1 of the flow channel 310 is equal to the width L5 of the second conduit 510.

[0139] In some embodiments, the fifth space-occupying member 450 is provided with a notch 451 that penetrates the fifth space-occupying member 450 in the radial direction, and the perfusion conduit 110 is directly or indirectly connected to the second conduit 510 through the notch 451. In this embodiment, the perfusion conduit 110 and the second conduit 510 are directly connected through the notch 451. In this embodiment, the fourth space-occupying member 440 is a cylinder that is sleeved on the second sub-shaft 222, the fifth space-occupying member 450 is a cylinder that is sleeved on the fourth space-occupying member 440, and the cylinder is provided with the notch 451.

[0140] The blood pumping device provided in this embodiment reduces the change in the radial dimension of the flow conduit when the perfusion fluid flows through the second transition cavity 102 and the flow channel 310, improves the flowability of the perfusion fluid between the proximal accommodation cavity 131 and the second transition cavity 102, and further reduces the retention of the perfusion fluid between the proximal accommodation cavity 131 and the second transition cavity 102 by providing the fourth space-occupying member 440 and the fifth space-occupying member 450 in the second transition cavity 102. By making the width L1 of the flow channel 310 equal to the width L5 of the second conduit 510, and making the outer circumferential surface of the fourth space-occupying member 440 flush with the first inner circumferential surface 311 of the first bearing 300 in the proximal accommodation cavity 131 and the inner circumferential surface of the fifth space-occupying member 450 flush with the first outer circumferential surface 312 of the first bearing 300 in the proximal accommodation cavity 131, the perfusion fluid in the accommodation cavity 130 is less hindered when flowing through the flow channel 310 and the second conduit 510, thereby improving the flowability of the perfusion fluid in the accommodation cavity and reducing the retention of the perfusion fluid in the accommodation cavity.

[0141] After the other cavities in the accommodating cavity are described, several implementations of other components in the intervention sheath are described below in combination with the drawings.

[0142] As shown in Figure 7 and Figure 8 In some embodiments, a third transition cavity 103 is further arranged in the sheath body 100 between the power cavity 170 and the second transition cavity 102, and the radial dimension of the third transition cavity 103 is usually smaller than that of the power cavity 170 and the second transition cavity 102. The blood pumping device further comprises a first plug 600 arranged in the third transition cavity 103. The third transition cavity 103 is used to enable the third sub-shaft 223 to extend into the power cavity 170, and the first plug 600 is a cylinder arranged on the third sub-shaft 223. The first plug 600 can be understood as a flange ring sealing the power cavity 170. The radial dimension of the third transition cavity 103 is smaller than that of the second transition cavity 102 and the power cavity 170.

[0143] The blood pumping device provided by the embodiment seals the power cavity 170 by arranging the first plug 600 in the third transition cavity 103, thereby preventing perfusion liquid from flowing into the power cavity 170 from the third transition cavity 103, and occupying the excess cavity to reduce bubble residue.

[0144] In some embodiments, the end surface of the first plug 600 facing the proximal accommodating cavity 131 is flush with the end surface of the fourth occupying member 440 facing the power cavity 170 and the end surface of the fifth occupying member 450 facing the power cavity 170, thereby improving the blocking ability of the first plug 600 to the perfusion liquid in the third transition cavity 103, optimizing the perfusion path, and reducing the dead zone.

[0145] As shown in Figures 1 to 8 In some embodiments, the sheath body 100 further comprises a reflux pipeline 120 communicating with the accommodating cavity 130. The perfusion liquid of the perfusion pipeline 110 flows to the reflux pipeline 120 after passing through the first bearing 300 and the first pipeline 500, and at least part of the reflux pipeline 120 is composed of the cavity after the extension cavity 140 removes the transmission assembly 200.

[0146] In some embodiments, a fourth transition lumen 104 and a fifth transition lumen 150 are further provided within the sheath body 100, and a first outlet 105 communicating with the fourth transition lumen 104 is further provided on the outer circumference of the sheath body 100. The fourth transition lumen 104 and the fifth transition lumen 150 are both cylindrical cavities. The fourth transition lumen 104 extends axially along the sheath body 100, and the fifth transition lumen 150 extends radially along the sheath body 100. The fifth transition lumen 150 connects the extension lumen 140 and the middle section of the fourth transition lumen 104. The perfusion fluid within the extension lumen 140 flows out of the interventional sheath 10 in sequence through the fifth transition lumen 150, the fourth transition lumen 104, and the first outlet 105. The blood pumping device further includes a second plug 610 located on the side of the fourth transition lumen 104 facing away from the first outlet 105. At least a portion of the reflux line 120 is comprised of the portion of the fourth transition lumen 104 excluding the second plug 610. The second plug 610 is a cylindrical member extending along the first direction x. The radial dimension of the second plug 610 is equal to the radial dimension of the fourth transition chamber 104. In some embodiments, the return line 120 includes the first outlet 105, the fifth transition chamber 150, the cavity of the fourth transition chamber 104 after removing the second plug 610, and the cavity of the extension chamber 140 after removing the transmission assembly 200. Two independently arranged perfusion lines 110 are provided in the sheath body 100, one of which is a perfusion line 110 ( Figure 7 The perfusion line 110 in the proximal end of the proximal accommodating cavity 131 is connected, and the other perfusion line 110 ( Figure 1 The perfusion line 110 in the figure extends from the proximal end to the distal end of the interventional sheath 10 and at least partially surrounds the extension cavity 140 and the distal accommodating cavity 132, and is connected to the second outlet 106 for delivering perfusion fluid to the distal accommodating cavity 132. The perfusion fluid in vitro flows into the interventional sheath 10 from the two perfusion lines 110, one of which flows from the proximal end of the proximal accommodating cavity 131 to the distal end, and flows out of the interventional sheath 10 (through the extension cavity 140, the fifth transition cavity 150 and the fourth transition cavity 104) from the first outlet 105. Figure 7 and Figure 8 The other perfusion fluid flows from the distal end of the distal accommodating cavity 132 to the proximal end, then flows through the extension cavity 140 to the fifth transition cavity 150 and merges with the other perfusion fluid before flowing out of the interventional sheath 10 from the first outlet 105 ( Figures 1 to 3 shown).

[0147] In some embodiments, the fifth transition cavity 150 and the fourth transition cavity 104 are both cylindrical cavities. A hole is punched on the end face of the sheath body 100 in the axial direction, and then the opening on the end face of the sheath body 100 is plugged with a plug, and the remaining cavity is the fourth transition cavity 104. A hole is punched on the outer peripheral surface of the sheath body 100 in the axial direction until it communicates with the fourth transition cavity 104 and the extension cavity 140, and then the opening on the outer peripheral surface of the sheath body 100 is plugged with a plug, and the remaining cavity is the fifth transition cavity 150. The second plug 610 is located at the end of the fourth transition cavity 104 away from the first outlet 105, and it can also be understood that the second plug 610 also plays the role of a plug, so that when the perfusion fluid flows from the fifth transition cavity 150 to the fourth transition cavity 104, it only flows in the first direction x to one side of the first outlet 105, and does not flow to the other side of the dead cavity, causing the perfusion fluid to stagnate.

[0148] In some embodiments, the end face of the second plug 610 towards the fourth transition cavity 104 is flush with the end face of the fifth transition cavity 150, which improves the blocking ability of the second plug 610 to the perfusion fluid in the fourth transition cavity 104 and the fifth transition cavity 150, optimizes the perfusion path, and reduces the dead zone.

[0149] The blood pumping device provided in the embodiment avoids bringing particles into another bearing accommodating cavity after the perfusion fluid flushes one bearing accommodating cavity, and improves the flushing ability of the perfusion fluid to the first bearing 300, by making the perfusion fluid flow into the proximal accommodating cavity 131 and the distal accommodating cavity 132 through two perfusion pipelines 110. By making the perfusion fluid flow from the distal end of the distal accommodating cavity 132 to the proximal end, the particles generated by the first bearing 300 will flow out from the proximal end of the distal accommodating cavity 132, reducing the risk of particles flowing into the patient's blood vessels from the second outlet 106. By setting the second plug 610 occupying the dead cavity in the fourth transition cavity 104, the perfusion fluid flowing from the fifth transition cavity 150 into the fourth transition cavity 104 can only flow in one direction to the first outlet 105, and cannot flow in the opposite direction into the dead cavity, causing the perfusion fluid to stagnate.

[0150] Of course, in other embodiments, two independent return pipelines 120 can also be provided in the intervention sheath 10, and the perfusion fluid in the proximal accommodating cavity 131 and the distal accommodating cavity 132 flows out of the intervention sheath 10 through the two return pipelines 120. The intervention sheath 10 can also have only a perfusion pipeline 110 without a return pipeline 120, and the perfusion fluid flows from the proximal end of the intervention sheath 10 into the proximal accommodating cavity 131, then flows to the distal accommodating cavity 132 through the extension cavity 140, and finally flows into the patient's blood vessels from the second outlet 106.

[0151] In some embodiments, the motor is arranged in an in-body transmission manner, the motor is also accommodated in the distal accommodation cavity 132, and the transmission assembly 200 only extends from the distal accommodation cavity 132 to the outflow channel 20, the power supply line and the control line of the motor extend to the proximal end of the intervention sheath 10 via the extension cavity 140 and finally extend out of the intervention sheath 10. In this embodiment, the occupying assembly 400 can still occupy the excess cavity in the distal accommodation cavity 132 without affecting the operation of the motor, thereby achieving the function of reducing the residual bubbles in the drainage pipeline.

[0152] In addition, the present application also provides an intervention sheath 10, which comprises a sheath body 100, a transmission assembly 200, a first bearing 300 and an occupying assembly 400. The sheath body 100 is internally provided with a perfusion pipeline 110 and an accommodation cavity 130 which are independent of each other and communicate with each other, and the transmission assembly 200 is at least partially located in the accommodation cavity 130. The first bearing 300 is located in the accommodation cavity 130 and connected with the sheath body 100, the first bearing 300 is sleeved on the transmission assembly 200, and the first bearing 300 is internally provided with a flow channel 310 for circulating perfusion liquid. The occupying assembly 400 comprises at least one occupying member located in the accommodation cavity 130, and the occupying member is internally formed with a flow pipeline 501 which communicates with the perfusion pipeline 110 and the flow channel 310; or the occupying member and at least one of the sheath body 100, the transmission assembly 200 and the first bearing 300 form the flow pipeline 501 which communicates with the perfusion pipeline 110 and the flow channel 310. The one-side displacement dimension of the flow pipeline 501 relative to the flow channel 310 is less than or equal to the radial dimension of the flow channel 310.

[0153] In some embodiments, the flow channel 310 comprises a first inner peripheral surface 311 facing the transmission assembly 200 and a first outer peripheral surface 312 away from the transmission assembly 200, and the spacing between the first inner peripheral surface 311 and the first outer peripheral surface 312 is the radial dimension L1 of the flow channel 310. The flow pipeline 501 comprises a second inner peripheral surface 502 facing the transmission assembly 200 and a second outer peripheral surface 503 away from the transmission assembly 200, and the spacing between the second inner peripheral surface 502 and the first inner peripheral surface 311 and the spacing between the second outer peripheral surface 503 and the first outer peripheral surface 312 are both less than or equal to the radial dimension L1 of the flow channel 310.

[0154] The intervention sheath 10 in this embodiment can be applied to the blood pumping device in any of the above embodiments, and the intervention sheath 10 in this embodiment can produce the same technical effects as the intervention sheath 10 in the above blood pumping device, which will not be described here.

[0155] In addition, the application also provides a blood pumping device, which comprises an intervention sheath 10 and an outflow channel 20. The intervention sheath 10 comprises a sheath body 100, a transmission assembly 200, a first bearing 300 and a space occupying assembly 400. The sheath body 100 is internally provided with a perfusion pipeline 110 and a receiving cavity 130 which are independent and communicated with each other, and the transmission assembly 200 is at least partially located in the receiving cavity 130. The first bearing 300 is located in the receiving cavity 130 and connected with the sheath body 100, the first bearing 300 is sleeved outside the transmission assembly 200, and the first bearing 300 is internally provided with a flow channel 310 for flowing perfusion liquid. The flow channel 310 comprises a first inner peripheral surface 311 facing the transmission assembly 200 and a first outer peripheral surface 312 away from the transmission assembly 200, and the spacing between the first inner peripheral surface 311 and the first outer peripheral surface 312 is the radial dimension L1 of the flow channel 310. The space occupying assembly 400 comprises at least one space occupying member located in the receiving cavity 130, and the space occupying member or the space between the space occupying member and at least one of the sheath body 100, the transmission assembly 200 and the first bearing 300 forms a flow pipeline 501 communicated with the perfusion pipeline 110 and the flow channel 310, and the included angle between the extension direction of the flow pipeline and the extension direction of the flow channel is greater than 90° and less than or equal to 180°.

[0156] In addition, the application also provides an intervention sheath 10, which comprises a sheath body 100, a transmission assembly 200, a first bearing 300 and a space occupying assembly 400. The sheath body 100 is internally provided with a perfusion pipeline 110 and a receiving cavity 130 which are independent and communicated with each other, and the transmission assembly 200 is at least partially located in the receiving cavity 130. The first bearing 300 is located in the receiving cavity 130 and connected with the sheath body 100, the first bearing 300 is sleeved outside the transmission assembly 200, and the first bearing 300 is internally provided with a flow channel 310 for flowing perfusion liquid. The flow channel 310 comprises a first inner peripheral surface 311 facing the transmission assembly 200 and a first outer peripheral surface 312 away from the transmission assembly 200, and the spacing between the first inner peripheral surface 311 and the first outer peripheral surface 312 is the radial dimension L1 of the flow channel 310. The space occupying assembly 400 comprises at least one space occupying member located in the receiving cavity 130, and the space occupying member or the space between the space occupying member and at least one of the sheath body 100, the transmission assembly 200 and the first bearing 300 forms a flow pipeline 501 communicated with the perfusion pipeline 110 and the flow channel 310, and the included angle between the extension direction of the flow pipeline and the extension direction of the flow channel is greater than 90° and less than or equal to 180°.

[0157] The blood pumping device described above, by setting the included angle between the extension direction of the flow pipeline 501 and the extension direction of the flow channel 310 as an obtuse angle, reduces the flow dead zone and blind area of the flow area, reduces the resistance of the perfusion liquid when flowing through the flow pipeline 501 and the flow channel 310, and reduces the impact of the perfusion liquid on the pipeline when flowing through the flow pipeline 501 and the flow channel 310, further improving the flowability of the perfusion liquid.

[0158] The intervention sheath 10 in the embodiment can be applied in the blood pumping device in the above embodiment. The intervention sheath 10 in the embodiment can produce the same technical effects as the intervention sheath 10 in the blood pumping device, and thus will not be described herein.

[0159] The above describes only specific embodiments of the present application. Those skilled in the art can clearly understand the specific working processes of the system, modules and units described above for the convenience and brevity of description. For reference, the corresponding processes in the foregoing method embodiments will not be described herein. It should be understood that the protection scope of the present application is not limited in this way. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application. These modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A blood pumping device, characterized by, The pump blood device comprises an intervention sheath and an outflow channel located at the distal end of the intervention sheath, and the intervention sheath comprises: a sheath body, which is internally provided with a communicating accommodating cavity and a perfusion pipeline; a transmission assembly, which is at least partially located in the accommodating cavity; a first bearing, which is located in the accommodating cavity and connected with the sheath body, the first bearing is sleeved outside the transmission assembly, and the first bearing is internally provided with a flow channel for circulating perfusion liquid; a space occupying assembly, which comprises at least one space occupying member located in the accommodating cavity, and a flow pipeline is formed between the space occupying member or between the space occupying member and at least one of the sheath body, the transmission assembly and the first bearing, and the flow pipeline is communicated with the perfusion pipeline and the flow channel; the one-side displacement dimension of the flow pipeline relative to the flow channel is less than or equal to the radial dimension of the flow channel.

2. The blood pumping device of claim 1, wherein the minimum distance between the center line of the flow channel and the center line of the flow pipeline is less than or equal to the radial dimension of the flow channel.

3. The blood pumping device according to claim 1 or 2, characterized in that the flow channel comprises a first inner peripheral surface facing the transmission assembly and a first outer peripheral surface away from the transmission assembly, the flow pipeline comprises a second inner peripheral surface facing the transmission assembly and a second outer peripheral surface away from the transmission assembly, and the one-side displacement dimension of the flow pipeline relative to the flow channel is the distance between the second inner peripheral surface and the first inner peripheral surface, or the one-side displacement dimension of the flow pipeline relative to the flow channel is the distance between the second outer peripheral surface and the first outer peripheral surface.

4. The pump blood device according to claim 3, wherein the flow channel and the flow pipeline are annular pipelines arranged around the transmission assembly, the axis of the flow channel is parallel to the axis of the flow pipeline, and the distance between the axis of the flow channel and the axis of the flow pipeline is less than or equal to the radial dimension of the flow channel; and / or, the axis of the flow channel is collinear with the axis of the flow pipeline.

5. The blood pumping device of claim 4, wherein, the circumferential surface composed of the center line of the flow channel intersects with the circumferential surface composed of the center line of the flow pipeline or is coplanar with the circumferential surface composed of the center line of the flow pipeline.

6. The blood pumping device of claim 5, wherein, the first inner peripheral surface is connected with the second inner peripheral surface, and the first outer peripheral surface is connected with the second outer peripheral surface, and the radial dimension of the flow pipeline is equal to the radial dimension of the flow channel.

7. The blood pumping device of claim 1, wherein, the flow channel comprises a first inner peripheral surface facing the transmission assembly and a first outer peripheral surface away from the transmission assembly, the flow pipeline comprises a second inner peripheral surface facing the transmission assembly and a second outer peripheral surface away from the transmission assembly, the first inner peripheral surface is connected with the second inner peripheral surface, and the included angle between the first inner peripheral surface and the second inner peripheral surface is greater than 90° and less than or equal to 180°, and the first outer peripheral surface is connected with the second outer peripheral surface, and the included angle between the first inner peripheral surface and the second inner peripheral surface is greater than 90° and less than or equal to 180°.

8. The blood pumping device of claim 7, wherein, the accommodating cavity comprises a bearing accommodating cavity, and the first bearing is located in the bearing accommodating cavity; the space occupying assembly comprises a first space occupying member located in the bearing accommodating cavity, and the first space occupying member is internally provided with a first pipeline communicated with the perfusion pipeline, and the radial dimension of the first pipeline is equal to the radial dimension of the flow channel.

9. The blood pumping device of claim 8, wherein, Two first bearings are arranged in the bearing accommodating cavity and spaced along the axial direction of the transmission assembly, and the first occupying member is located between the two first bearings.

10. The blood pumping device of claim 8, wherein, The first occupying member comprises a third sub-member and a fourth sub-member, the third sub-member is sleeved outside the transmission assembly, the fourth sub-member is sleeved outside the third sub-member, a gap between the third sub-member and the fourth sub-member forms the first pipeline, and a distance between an outer circumferential surface of the third sub-member and an inner circumferential surface of the fourth sub-member in the radial direction of the intervention sheath tube is equal to a radial dimension of the flow channel.

11. The blood pumping device of claim 10, wherein, The proximal end and the distal end of the third sub-member are respectively in abutment with the two first bearings, and the proximal end and the distal end of the fourth sub-member are respectively in abutment with the two first bearings.

12. The blood pumping device of claim 8, wherein, The bearing accommodating cavity comprises a proximal end accommodating cavity and a distal end accommodating cavity, and the sheath tube body further comprises an extension cavity extending from the proximal end to the distal end, the extension cavity directly or indirectly communicates with the proximal end accommodating cavity and the distal end accommodating cavity, at least part of the transmission assembly extends from the proximal end accommodating cavity to the distal end accommodating cavity through the extension cavity, at least one first bearing is arranged in each of the proximal end accommodating cavity and the distal end accommodating cavity, and the first occupying member is arranged in at least one of the proximal end accommodating cavity and the distal end accommodating cavity.

13. The blood pumping device of claim 12, wherein, The accommodating cavity further comprises a first transition cavity communicating the distal end accommodating cavity and the extension cavity, a radial dimension of the distal end accommodating cavity is greater than a radial dimension of the extension cavity, and a radial dimension of the first transition cavity gradually decreases in a direction from the distal end to the proximal end. The occupying assembly further comprises a third occupying member, the third occupying member is located in the first transition cavity and sleeved outside the transmission assembly, the third occupying member is provided with a first surface facing away from the transmission assembly, a distance between the first surface and an axis of the transmission assembly gradually decreases in a direction from the distal end to the proximal end, and a gap between the first surface and a conical surface of the first transition cavity forms a fourth pipeline communicating the flow channel and the extension cavity.

14. The blood pumping device of claim 13, wherein, The distance between the first surface and the conical surface of the first transition cavity in the radial direction of the intervention sheath tube is equal to the radial dimension of the flow channel. The first surface is connected with the first inner circumferential surface, and an included angle between the first surface and the first inner circumferential surface is greater than 90° and less than 180°; the conical surface of the first transition cavity is connected with the first outer circumferential surface, and an included angle between the conical surface of the first transition cavity and the first outer circumferential surface is greater than 90° and less than 180°.

15. The blood pumping device of claim 13, wherein, The transmission assembly comprises a first transmission shaft and an impeller connected with each other, the first transmission shaft extends from the first transition cavity to the extension cavity, the impeller comprises an impeller shaft and an impeller body connected with each other, the impeller body extends from the distal end accommodating cavity to the outflow channel, at least part of the impeller shaft is sleeved outside the first transmission shaft, extends from the first transition cavity to the distal end accommodating cavity, and is connected with the impeller body. The third space-occupying member comprises a first sub-member and a second sub-member, the first sub-member is sleeved outside the impeller shaft, the second sub-member is sleeved outside the first transmission shaft, the first sub-member is located at the distal end of the second sub-member, the distance between the first surface of the first sub-member and the axis of the transmission assembly gradually decreases in the direction from the distal end to the proximal end, the distance between the first surface of the second sub-member and the axis of the transmission assembly gradually decreases in the direction from the distal end to the proximal end, and the distance between the first surface of the first sub-member and the conical surface of the first transition cavity in the radial direction of the intervention sheath is equal to the distance between the first surface of the second sub-member and the conical surface of the first transition cavity in the radial direction of the intervention sheath.

16. The blood pumping device of claim 12, wherein, The accommodation cavity further comprises a second transition cavity, and the sheath body further comprises a power cavity, the proximal accommodation cavity, the second transition cavity and the power cavity are arranged in sequence in the direction from the distal end to the proximal end. The transmission assembly comprises coaxially connected first and second transmission shafts, at least part of the first transmission shaft is located in the extension cavity, the second transmission shaft extends into the extension cavity from the power cavity through the proximal accommodation cavity and is connected with the first transmission shaft, the second transmission shaft comprises first, second and third sub-shafts arranged in sequence in the direction from the distal end to the proximal end, at least part of the first sub-shaft is located in the proximal accommodation cavity, the second sub-shaft is located in the second transition cavity, and at least part of the third sub-shaft is located in the power cavity, the radial dimension of the second sub-shaft is smaller than the radial dimensions of the first and third sub-shafts. The space-occupying assembly further comprises fourth and fifth space-occupying members both located in the second transition cavity, the fourth space-occupying member is sleeved outside the second sub-shaft, the fifth space-occupying member is sleeved outside the fourth space-occupying member, and a gap between the fourth and fifth space-occupying members forms a second pipeline, which is in communication with the flow channel in the proximal accommodation cavity.

17. The blood pumping device of claim 16, wherein, The fifth space-occupying member is provided with a notch penetrating the fifth space-occupying member in the radial direction, and the perfusion pipeline is directly or indirectly communicated with the second pipeline through the notch.

18. The blood pumping device of claim 16, wherein, The radial dimension of the second pipeline is equal to the radial dimension of the flow channel. The outer circumferential surface of the fourth space-occupying member is connected with the first inner circumferential surface of the first bearing located in the proximal accommodation cavity, and the included angle between the outer circumferential surface of the fourth space-occupying member and the first inner circumferential surface of the first bearing located in the proximal accommodation cavity is equal to 180°, the inner circumferential surface of the fifth space-occupying member is connected with the first outer circumferential surface of the first bearing located in the proximal accommodation cavity, and the included angle between the inner circumferential surface of the fifth space-occupying member and the first outer circumferential surface of the first bearing located in the proximal accommodation cavity is equal to 180°.

19. The blood pumping device of claim 16, wherein, The sheath body further comprises a third transition cavity located between the power cavity and the second transition cavity. The blood pumping device further comprises a first plug located in the third transition cavity.

20. The blood pumping device of claim 12, wherein, The sheath body is further provided with a return pipeline in communication with the accommodating cavity, and the perfusion liquid of the perfusion pipeline flows to the return pipeline after passing through the first bearing and the first pipeline.

21. The blood pumping device of claim 20, wherein, The sheath body is further provided with a fourth transition cavity and a fifth transition cavity, and the outer circumferential surface of the sheath body is further provided with a first outlet in communication with the fourth transition cavity. The fourth transition cavity extends along the axial direction of the sheath body, and the fifth transition cavity extends along the radial direction of the sheath body.

22. The blood pumping device of claim 8, wherein, The fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity. The pump device further comprises a second plug, and the second plug is located at one end of the fourth transition cavity away from the first outlet.

23. The blood pumping device of claim 22, wherein, The accommodating cavity further comprises a sixth transition cavity in communication with the bearing accommodating cavity. The sixth transition cavity has a radial dimension smaller than that of the bearing accommodating cavity in direct communication therewith.

24. An intervention sheath, comprising: The occupying assembly further comprises an eighth occupying member and a ninth occupying member located in the sixth transition cavity. The eighth occupying member is sleeved outside the transmission assembly, and the ninth occupying member is sleeved outside the eighth occupying member. The second surface of the eighth occupying member is away from the transmission assembly, and the third surface of the ninth occupying member is towards the second surface. The interval between the second surface and the third surface gradually decreases in the direction away from the accommodating cavity. The interval between the second surface and the third surface in the radial direction of the interventional sheath is equal to the radial dimension of the flow channel. The second surface is connected with the first inner circumferential surface, and the included angle between the second surface and the first inner circumferential surface is greater than 90° and less than 180°.

25. A blood pumping device, characterized by The third surface is connected with the first outer circumferential surface, and the included angle between the third surface and the first outer circumferential surface is greater than 90° and less than 180°. The sheath body is further provided with a return pipeline in communication with the accommodating cavity, and the perfusion liquid of the perfusion pipeline flows to the return pipeline after passing through the first bearing and the first pipeline. The sheath body is further provided with a fourth transition cavity and a fifth transition cavity, and the outer circumferential surface of the sheath body is further provided with a first outlet in communication with the fourth transition cavity. The fourth transition cavity extends along the axial direction of the sheath body, and the fifth transition cavity extends along the radial direction of the sheath body. The fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity. The fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity. The second surface of the eighth occupying member is away from the transmission assembly, and the third surface of the ninth occupying member is towards the second surface. The interval between the second surface and the third surface gradually decreases in the direction away from the accommodating cavity. The interval between the second surface and the third surface in the radial direction of the interventional sheath is equal to the radial dimension of the flow channel. The second surface is connected with the first inner circumferential surface, and the included angle between the second surface and the first inner circumferential surface is greater than 90° and less than 180°. The third surface is connected with the first outer circumferential surface, and the included angle between the third surface and the first outer circumferential surface is greater than 90° and less than 180°. The sheath body is further provided with a return pipeline in communication with the accommodating cavity, and the perfusion liquid of the perfusion pipeline flows to the return pipeline after passing through the first bearing and the first pipeline. The sheath body is further provided with a fourth transition cavity and a fifth transition cavity, and the outer circumferential surface of the sheath body is further provided with a first outlet in communication with the fourth transition cavity. The fourth transition cavity extends along the axial direction of the sheath body, and the fifth transition cavity extends along the radial direction of the sheath body. The fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity. The fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity. The second surface of the eighth occupying member is away from the transmission assembly, and the third surface of the ninth occupying member is towards the second surface. The interval between the second surface and the third surface gradually decreases in the direction away from the accommodating cavity. The interval between the second surface and the third surface in the radial direction of the interventional sheath is equal to the radial dimension of the flow channel. The second surface is connected with the first inner circumferential surface, and the included angle between the second surface and the first inner circumferential surface is greater than 90° and less than 180°. The third surface is connected with the first outer circumferential surface, and the included angle between the third surface and the first outer circumferential surface is greater than 90° and less than 180°. The sheath body is further provided with a return pipeline in communication with the accommodating cavity, and the perfusion liquid of the perfusion pipeline flows to the return pipeline after passing through the first bearing and the first pipeline. The sheath body is further provided with a fourth transition cavity and a fifth transition cavity, and the outer circumferential surface of the sheath body is further provided with a first outlet in communication with the fourth transition cavity. The fourth transition cavity extends along the axial direction of the sheath body, and the fifth transition cavity extends along the radial direction of the sheath body. The fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity. The fifth transition cavity is in communication with the middle section of the fourth transition cavity and the extension cavity. The second surface of the eighth occupying member is away from the transmission assembly, and the third surface of the ninth occupying member is towards the second surface. The interval between the second surface and the third surface gradually decreases in the direction away from the accommodating cavity. The interval between the second surface and the third surface in the radial direction of the interventional sheath is equal to the radial dimension of the flow channel. The second surface is connected with the first inner circumferential surface, and the included angle between the second surface and the first inner circumferential surface is greater than 90° and less than 180°. The third surface is connected with the first outer circumferential surface, and the included angle between the third surface and the first outer circumferential surface is greater than 90° and less than 180°. The sheath body is internally provided with a communicating accommodating cavity and a perfusion pipeline; The transmission assembly is at least partially located in the accommodating cavity; The first bearing is located in the accommodating cavity and connected with the sheath body, the first bearing is sleeved outside the transmission assembly, and the first bearing is internally provided with a flow channel for circulating perfusion liquid; The occupying assembly includes at least one occupying piece located in the accommodating cavity, a flow-through pipeline is formed in the occupying piece or between the occupying piece and at least one of the sheath body, the transmission assembly and the first bearing, the flow-through pipeline is communicated with the perfusion pipeline and the flow channel, and the extension direction of the flow-through pipeline and the extension direction of the flow channel form an angle greater than 90° and less than or equal to 180°.

26. An intervention sheath, comprising: Comprise: The sheath body is internally provided with a communicating accommodating cavity and a perfusion pipeline; The transmission assembly is at least partially located in the accommodating cavity; The first bearing is located in the accommodating cavity and connected with the sheath body, the first bearing is sleeved outside the transmission assembly, and the first bearing is internally provided with a flow channel for circulating perfusion liquid; The occupying assembly includes at least one occupying piece located in the accommodating cavity, a flow-through pipeline is formed in the occupying piece or between the occupying piece and at least one of the sheath body, the transmission assembly and the first bearing, the flow-through pipeline is communicated with the perfusion pipeline and the flow channel, and the extension direction of the flow-through pipeline and the extension direction of the flow channel form an angle greater than 90° and less than or equal to 180°.

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