Blood pumping device and intervention sheath tube

Abstract

The invention 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] This application belongs to the field of medical device technology, and in particular relates to blood pumping devices and interventional sheaths. Background Technology

[0002] During cardiac surgery, due to the patient's underlying medical condition or the needs of the procedure, the patient's heart function may be weakened, resulting in insufficient pumping capacity. In such cases, active interventional medical devices, such as ventricular assist devices (VADs), are needed to assist the heart in pumping blood. Existing VADs utilize the principle of cardiac pumping, pumping blood out of the heart through a pumping mechanism and diverting it to the aorta outside the heart for distribution throughout the body.

[0003] In some scenarios, ventricular assist devices generate heat during operation, thus requiring the flow of perfusion fluid to cool them down. However, the perfusion drainage path is complex and tortuous, which can easily lead to the formation of air bubbles that are difficult to expel, posing a risk of perfusion fluid interruption, blood backflow, or air bubbles entering the blood vessels. Summary of the Invention

[0004] This application provides a blood pumping device that can reduce air bubbles remaining in the perfusion drainage pipeline.

[0005] This application provides a blood pumping device, including an interventional sheath and a distal assembly located at the distal end of the interventional sheath. The interventional sheath includes a sheath body, a transmission assembly, a first bearing, and a spacer assembly. The sheath body has a communicating receiving cavity and an infusion line inside. The transmission assembly is at least partially located within the receiving cavity. The first bearing is located within the receiving cavity and connected to the sheath body, and is sleeved outside the transmission assembly. The first bearing has a flow channel for the flow of infusion fluid. The spacer assembly includes at least one spacer located within the receiving cavity. A flow channel is formed within the spacer or between the spacer and at least one of the sheath body, the transmission assembly, and the first bearing, and the flow channel communicates with the infusion line and the flow channel. The unilateral displacement dimension of the flow channel relative to the flow channel is less than or equal to the radial dimension of the flow channel.

[0006] According to an embodiment of the first aspect of this application, the flow channel includes a first inner peripheral surface facing the transmission assembly and a first outer peripheral surface facing away from the transmission assembly, wherein the distance between the first inner peripheral surface and the first outer peripheral surface is the radial dimension of the flow channel.

[0007] According to an embodiment of the first aspect of this 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, and the flow conduit includes a second inner circumferential surface facing the transmission assembly and a second outer circumferential surface facing away from the transmission assembly. The unilateral displacement dimension of the flow conduit relative to the flow channel can be the distance between the second inner circumferential surface and the first inner circumferential surface, or it can be the distance between the second outer circumferential surface and the first outer circumferential surface. The unilateral displacement dimension is less than or equal to the radial dimension of the flow channel.

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

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

[0010] According to an embodiment of the first aspect of this application, the circumferential surface formed by the centerline of the flow channel intersects or is coplanar with the circumferential surface formed by the centerline of the flow pipe.

[0011] According to an embodiment of the first aspect of this 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 pipe is equal to the radial dimension of the flow channel.

[0012] According to an embodiment of the first aspect of this application, the flow channel includes a first inner peripheral surface facing the transmission assembly and a first outer peripheral surface away from the transmission assembly, and the flow conduit includes 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 to 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°. The first outer peripheral surface is connected to the second outer peripheral surface and the 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°.

[0013] According to an embodiment of the first aspect of this application, the receiving cavity includes a bearing receiving cavity, and a first bearing is located inside the bearing receiving cavity; the occupant assembly includes a first occupant located in the bearing receiving cavity, and the first occupant is provided with a first pipeline communicating with the injection pipeline, the radial dimension of the first pipeline being equal to the radial dimension of the flow channel.

[0014] According to an embodiment of the first aspect of this application, two first bearings are provided in the same bearing housing cavity, which are spaced apart along the axial direction of the transmission assembly, and a first occupant is located between the two first bearings.

[0015] According to an embodiment of the first aspect of this application, the first occupant includes a third sub-component and a fourth sub-component. The third sub-component is sleeved outside the transmission assembly, and the fourth sub-component is sleeved outside the third sub-component. The gap between the third sub-component and the fourth sub-component forms a first conduit. The distance between the outer peripheral surface of the third sub-component and the inner peripheral surface of the fourth sub-component in the radial direction of the intervention sheath is equal to the radial dimension of the flow channel.

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

[0017] According to an embodiment of the first aspect of this application, the bearing receiving cavity includes a proximal receiving cavity and a distal receiving cavity; the sheath body is further provided with an extension cavity extending from the proximal end to the distal end, the extension cavity directly or indirectly connecting the proximal receiving cavity and the distal receiving cavity, at least a portion of the transmission component extends from the proximal receiving cavity to the distal receiving cavity via the extension cavity, and at least one first bearing is provided in both the proximal receiving cavity and the distal receiving cavity; at least one of the proximal receiving cavity and the distal receiving cavity is provided with a first occupant.

[0018] According to an embodiment of the first aspect of this application, the receiving cavity further includes a first transition cavity connecting the distal receiving cavity and the extension cavity. The radial dimension of the distal receiving cavity is larger than the radial dimension of the extension cavity, and the radial dimension of the first transition cavity gradually decreases from the distal end to the proximal end. The occupant assembly further includes a third occupant, which is located inside the first transition cavity and sleeved outside the transmission assembly. The third occupant has a first surface facing away from the transmission assembly. The distance between the first surface and the axis of the transmission assembly gradually decreases from the distal end to the proximal end. The gap between the first surface and the conical surface of the first transition cavity forms a fourth conduit connecting the flow channel and the extension cavity.

[0019] According to an embodiment of the first aspect of this application, the distance between the first surface and the conical surface of the first transition cavity in the radial direction of the intervention sheath is equal to the radial dimension of the flow channel; the first surface is connected to 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 to 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 an embodiment of the first aspect of this application, the transmission assembly includes a first transmission shaft and an impeller connected to each other. The first transmission shaft extends from a first transition cavity to an extension cavity. The impeller includes an impeller shaft and an impeller body connected to each other. The impeller body extends from a distal receiving cavity to an outlet channel. At least a portion of the impeller shaft is sleeved outside the first transmission shaft and extends from the first transition cavity to the distal receiving cavity and is connected to the impeller body. The third occupant includes a first sub-component and a second sub-component. The first sub-component is sleeved outside the impeller shaft, and the second sub-component is sleeved outside the first transmission shaft. The first sub-component is located at the distal end of the second sub-component. The distance between the first surface of the first sub-component and the axis of the transmission assembly, and the distance between the first surface of the second sub-component and the axis of the transmission assembly, both gradually decrease in the direction from the distal end to the proximal end. The distance between the first surface of the first sub-component 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-component and the conical surface of the first transition cavity in the radial direction of the interventional sheath.

[0021] According to an embodiment of the first aspect of this application, the receiving cavity further includes a second transition cavity, and the sheath body is further provided with a power cavity. The proximal receiving cavity, the second transition cavity, and the power cavity are arranged sequentially from the distal end to the proximal end. The transmission assembly includes a first transmission shaft and a second transmission shaft coaxially connected. At least a portion of the first transmission shaft is located in the extension cavity. The second transmission shaft extends from the power cavity through the proximal receiving cavity into the extension cavity and is connected to the first transmission shaft. The second transmission shaft includes a first sub-shaft, a second sub-shaft, and a third sub-shaft arranged sequentially from the distal end to the proximal end. At least a portion of the first sub-shaft is located in the proximal receiving cavity, the second sub-shaft is located in the second transition cavity, and at least a portion 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 sub-shaft and the third sub-shaft. The occupant assembly further includes a fourth occupant and a fifth occupant, both located in the second transition cavity. The fourth occupant is sleeved outside the second sub-shaft, and the fifth occupant is sleeved outside the fourth occupant. The gap between the fourth occupant and the fifth occupant forms a second pipeline, which communicates with the flow channel in the proximal receiving cavity.

[0022] According to the first aspect of this application, the fifth occupant has a notch that penetrates the fifth occupant radially, and the injection pipeline is directly or indirectly connected to the second pipeline through the notch.

[0023] According to an embodiment of the first aspect of this 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 occupant is connected to the first inner peripheral surface of the first bearing located in the proximal receiving cavity, and the included angle between the outer peripheral surface of the fourth occupant and the first inner peripheral surface of the first bearing located in the proximal receiving cavity is equal to 180°; the inner peripheral surface of the fifth occupant is connected to the first outer peripheral surface of the first bearing located in the proximal receiving cavity, and the included angle between the inner peripheral surface of the fifth occupant and the first outer peripheral surface of the first bearing located in the proximal receiving cavity is equal to 180°.

[0024] According to an embodiment of the first aspect of this application, the sheath body is further provided with a third transition chamber located between the power chamber and the second transition chamber; the blood pumping device also includes a first plug located in the third transition chamber.

[0025] According to the first aspect of the present application, the sheath body is further provided with a return pipeline communicating with the receiving cavity. The injection fluid of the injection pipeline flows through the first bearing and the first pipeline and then flows to the return pipeline. At least part of the return pipeline is composed of the cavity after the transmission component is removed from the extension cavity.

[0026] According to the first aspect of the present application, the sheath body is further provided with a fourth transition cavity and a fifth transition cavity, and a first outlet communicating with the fourth transition cavity is also provided on the outer peripheral surface of the sheath body. The fourth transition cavity extends axially along the sheath body, and the fifth transition cavity extends radially along the sheath body. The fifth transition cavity communicates with the middle section of the extension cavity and the fourth transition cavity. The perfusion fluid 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 also includes a second plug, which is located at the end of the fourth transition cavity away from the first outlet. At least part of the return pipe route is composed of the cavity after the second plug is removed from the fourth transition cavity.

[0027] According to an embodiment of the first aspect of this application, the receiving cavity further includes a sixth transition cavity, which is connected to the bearing receiving cavity. The radial dimension of the sixth transition cavity is smaller than the radial dimension of the bearing receiving cavity directly connected to it. The occupant assembly further includes an eighth occupant and a ninth occupant located in the sixth transition cavity. The eighth occupant is sleeved outside the transmission assembly, and the ninth occupant is sleeved outside the eighth occupant. The eighth occupant has a second surface facing away from the transmission assembly, and the ninth occupant has 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 along the direction away from the receiving cavity. The gap between the second surface and the third surface forms a third pipeline connected to the flow channel.

[0028] According to an embodiment of the first aspect of this application, the radial distance between the second surface and the third surface in the intervention sheath is equal to the radial dimension of the flow channel; the second surface is connected to 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 to 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] An embodiment of the second aspect of this application provides an interventional sheath, including a sheath body, a transmission assembly, a first bearing, and a spacer assembly. The sheath body has a communicating receiving cavity and an infusion passage. The transmission assembly is at least partially located within the receiving cavity. The first bearing is located within the receiving cavity and connected to the sheath body, and is sleeved outside the transmission assembly. The first bearing has a flow channel for the flow of infusion fluid. The spacer assembly includes at least one spacer located within the receiving cavity. A flow passage is formed within the spacer or between the spacer and at least one of the sheath body, the transmission assembly, and the first bearing, and the flow passage communicates with the infusion passage and the flow channel. In the radial direction, the unilateral displacement dimension of the flow passage relative to the flow channel is less than or equal to the dimension of the flow channel.

[0030] In some application scenarios, 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, with the distance between the first inner and outer circumferential surfaces being the radial dimension of the flow channel. The flow conduit includes a second inner circumferential surface facing the transmission assembly and a second outer circumferential surface facing away from the transmission assembly. The unilateral misalignment dimension can be the distance between the second and first inner circumferential surfaces, or it can be the distance between the second and first outer circumferential surfaces. The unilateral misalignment dimension is always less than or equal to the radial dimension of the flow channel.

[0031] According to an embodiment of the second aspect of this application, the minimum distance between the centerline of the flow channel and the centerline of the flow pipe is less than or equal to the radial dimension of the flow channel; wherein, the minimum distance between the centerline of the flow channel and the first inner circumferential surface and the first outer circumferential surface is equal, and the minimum distance between the centerline of the flow pipe and the second inner circumferential surface and the second outer circumferential surface is equal.

[0032] According to the second aspect of this application, both the flow channel and the circulation pipe are annular pipes arranged around the transmission assembly, the axis of the flow channel is parallel to the axis of the circulation pipe, and the distance between the axis of the flow channel and the axis of the circulation pipe is less than or equal to the radial dimension of the flow channel.

[0033] According to the second aspect of this application, both the flow channel and the circulation pipe are annular pipes arranged around the transmission assembly, and the axis of the flow channel is collinear with the axis of the circulation pipe.

[0034] According to an embodiment of the second aspect of this application, the circumferential surface formed by the centerline of the flow channel intersects or is coplanar with the circumferential surface formed by the centerline of the flow pipeline.

[0035] According to an embodiment of the second aspect of this 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 pipe is equal to the radial dimension of the flow channel.

[0036] According to an embodiment of the second aspect of this application, the first inner circumferential surface is connected to the second inner circumferential surface and 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°, and 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°.

[0037] According to an embodiment of the second aspect of this application, the receiving cavity includes a bearing receiving cavity, and a first bearing is located inside the bearing receiving cavity; the occupant assembly includes a first occupant located in the bearing receiving cavity, and the first occupant is provided with a first pipeline communicating with the injection pipeline, the radial dimension of the first pipeline being equal to the radial dimension of the flow channel.

[0038] An embodiment of the third aspect of this application provides a blood pumping device, including an interventional sheath and an outflow channel located at the distal end of the interventional sheath. The interventional sheath includes a sheath body, a transmission assembly, a first bearing, and a spacer assembly. The sheath body has a communicating receiving cavity and an infusion line inside. The transmission assembly is at least partially located in the receiving cavity. The first bearing is located in the receiving cavity and connected to the sheath body. The first bearing is sleeved outside the transmission assembly and has a flow channel for the flow of infusion fluid inside. The spacer assembly includes at least one spacer located in the receiving cavity. A flow channel is formed within the spacer or between the spacer and at least one of the sheath body, the transmission assembly, and the first bearing. The flow channel is connected to the infusion line and the flow channel. The angle between the extension direction of the flow channel and the extension direction of the flow channel is greater than 90° and less than or equal to 180°.

[0039] An embodiment of the fourth aspect of this application provides an interventional sheath, including a sheath body, a transmission assembly, a first bearing, and a spacer assembly. The sheath body has a communicating receiving cavity and an infusion line inside. The transmission assembly is at least partially located in the receiving cavity. The first bearing is located in the receiving cavity and connected to the sheath body. The first bearing is sleeved outside the transmission assembly and has a flow channel for the flow of infusion fluid inside. The spacer assembly includes at least one spacer located in the receiving cavity. A flow channel is formed within the spacer or between the spacer and at least one of the sheath body, the transmission assembly, and the first bearing. The flow channel is connected to the infusion line and the flow channel. The angle between the extension direction of the flow channel 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 this application embodiment includes an interventional sheath and a distal assembly located at the distal end of the interventional sheath. The interventional sheath includes a sheath body, a transmission assembly, a first bearing, and a spacer assembly. The sheath body has an independent but interconnected receiving cavity and an infusion line. The transmission assembly is at least partially located within the receiving cavity. The first bearing is located within the receiving cavity and connected to the sheath body, and is sleeved outside the transmission assembly. The first bearing has a flow channel for the flow of infusion fluid. The spacer assembly includes at least one spacer located within the receiving cavity. A flow channel is formed within the spacer or between the spacer and at least one of the sheath body, the transmission assembly, and the first bearing. The flow channel is connected to the infusion line and the flow channel. The unilateral displacement dimension of the flow channel relative to the flow channel is less than or equal to the radial dimension of the flow channel. This application reduces air bubble residue in the infusion drainage line by further providing a spacer within the receiving cavity for accommodating the first bearing, thereby occupying excess cavity space within the receiving cavity. By creating a flow channel that communicates with the infusion tubing and flow path within the occupant or between the occupant and at least one of the sheath body, transmission assembly, and first bearing, and ensuring that the unilateral displacement of the flow channel relative to the flow path is less than or equal to the radial dimension of the flow path, the radial dimension difference between the flow path and other tubing within the receiving cavity is reduced. This reduces the obstruction encountered by the infusion fluid as it flows through the flow path and flow channel, thereby improving the flowability of the infusion fluid within the receiving cavity and reducing its retention. Furthermore, by optimizing the infusion drainage path and filling and covering the venting dead zone on the infusion drainage path with the occupant component, this structure reduces the venting dead zone, thereby reducing the risk of blood backflow into the interventional sheath and air bubbles entering the body. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a partial longitudinal cross-sectional schematic diagram of the outflow channel and the distal end of the interventional sheath in some embodiments of this application;

[0043] Figure 2 A partial longitudinal cross-sectional schematic diagram of an example outflow channel and distal end of the interventional sheath after concealing the occupant assembly is shown.

[0044] Figure 3 An example is shown. Figure 1 A magnified view of the distal end of the outflow channel and interventional sheath at position A;

[0045] Figure 4 A longitudinal cross-sectional schematic diagram of an example first bearing is shown;

[0046] Figure 5 A schematic cross-sectional view of an example first occupant is shown;

[0047] Figure 6 A longitudinal cross-sectional schematic diagram of an example eighth and ninth occupant is shown.

[0048] Figure 7 A partial longitudinal cross-sectional schematic diagram of the proximal end of an example interventional sheath is shown;

[0049] Figure 8 A partial longitudinal cross-sectional view of the proximal end of an example interventional sheath is shown after concealing the occupant assembly, the first plug, and the second plug.

[0050] Figure 9 A partial longitudinal cross-sectional schematic diagram of an example second drive shaft is shown;

[0051] Figure 10 A cross-sectional schematic diagram of an example fourth and fifth occupant is shown.

[0052] Figure label:

[0053] 10. Intervention sheath; 20. Outflow channel;

[0054] 100. Sheath body; 101. First transition chamber; 1011. Conical surface; 102. Second transition chamber; 103. Third transition chamber; 104. Fourth transition chamber; 105. First outlet; 106. Second outlet; 110. Infusion line; 120. Return line; 130. Receiving chamber; 131. Proximal receiving chamber; 132. Distal receiving chamber; 140. Extension chamber; 150. Fifth transition chamber; 160. Sixth transition chamber; 170. Power chamber;

[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 component; 401, First placeholder; 410, Third sub-component; 420, Fourth sub-component; 430, Third placeholder; 431, First surface; 432, First sub-component; 433, Second sub-component; 440, Fourth placeholder; 450, Fifth placeholder; 451, Notch; 480, Eighth placeholder; 481, Second surface; 490, Ninth placeholder; 491, Third surface;

[0058] 501. Flow pipe; 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, the first direction. Detailed Implementation

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

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0063] To address the technical problems mentioned in the background art, the applicant proposes a blood pumping device, which includes an interventional sheath and an outflow channel. The interventional sheath includes a sheath body, a transmission assembly, a first bearing, and a spacer assembly. The sheath body has an independent but interconnected receiving cavity and an infusion conduit. The transmission assembly is at least partially located within the receiving cavity. The first bearing is located within the receiving cavity and connected to the sheath body, and is sleeved outside the transmission assembly. The first bearing has a flow channel for the flow of infusion fluid. The spacer assembly includes at least one spacer located within the receiving cavity. A flow channel is formed within the spacer or between the spacer and at least one of the sheath body, the transmission assembly, and the first bearing, and the flow channel communicates with the infusion conduit and the flow channel. The unilateral 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 may include a first inner circumferential surface facing the transmission assembly and a first outer circumferential surface facing away from the transmission assembly, wherein the distance between the first inner circumferential surface and the first outer circumferential surface is the radial dimension of the flow channel. The flow conduit includes a second inner circumferential surface facing the transmission assembly and a second outer circumferential surface facing away from the transmission assembly. The unilateral misalignment dimension may be the distance between the second inner circumferential surface and the first inner circumferential surface, or the distance between the second outer circumferential surface and the first outer circumferential surface. The unilateral misalignment dimension is less than or equal to the radial dimension of the flow channel.

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

[0066] The interventional sheath provided in this application reduces air bubble residue in the perfusion drainage line by further providing a spacer within the receiving cavity for accommodating the first bearing. This spacer occupies excess space within the receiving cavity. By forming a flow channel communicating with the perfusion line and flow passage within the spacer or between the spacer and at least one of the sheath body, transmission assembly, and first bearing, and by ensuring that the displacement of the flow channel relative to the flow passage is less than or equal to the radial dimension of the flow passage, the radial dimension difference between the flow passage and other lines within the receiving cavity is reduced. This reduces the obstruction encountered by the perfusion fluid as it flows through the flow passage and flow channel, thereby improving the flowability of the perfusion fluid within the receiving cavity and reducing its retention. Furthermore, by optimizing the perfusion drainage path and filling and covering the venting dead zone along the perfusion drainage path with the spacer, this structure reduces venting dead zones, decreasing the risk of blood backflow into the interventional sheath and air bubbles entering the body.

[0067] It is understood that the interventional sheath in this application can be used in applications such as blood pumping devices, tissue fluid pumping devices, and digestive fluid pumping devices to achieve the purpose of pumping fluids such as blood, tissue fluid, and digestive fluid. For ease of understanding and description, the following description will continue to take the application scenario of the interventional sheath in a blood pumping device as an example.

[0068] First, let's briefly describe the overall structure of the blood pumping device with reference to the attached diagram, in order to understand the working environment of the blood pumping device. Figure 1 This is a longitudinal cross-sectional schematic diagram of the outflow channel and the distal end of the interventional sheath in some embodiments of this application. Figure 7 A partial longitudinal cross-sectional schematic diagram of the proximal end of an example interventional sheath is shown. Combined with... Figure 1 and Figure 7 As can be seen, this application provides a blood pumping device, which includes an interventional sheath 10, an outflow channel 20, and a motor (not shown). The motor is divided into externally driven type and internally driven type. The difference is whether the motor is located inside or outside the patient's body when the blood pumping device is in use. The following description of the blood pumping device provided by this application takes the externally driven type as an example.

[0069] like Figure 1 As shown, in the blood pumping device, the outflow channel 20 is connected to the distal end of the interventional sheath 10, and the motor is connected to the proximal end of the interventional sheath 10. The interventional sheath 10 includes a sheath body 100 and a transmission assembly 200. The motor is connected to the transmission assembly 200 to output torque to the transmission assembly 200, driving the transmission assembly 200 to rotate. The transmission assembly 200 extends from the proximal end to the distal end, and its distal end 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 patient's circulatory system. The sheath body 100 also has a relatively isolated but interconnected perfusion line 110 and a return line 120 inside. The perfusion line 110 is used to deliver perfusion fluid to the distal end of the interventional sheath 10 to maintain a certain pressure at the distal end of the interventional sheath 10 and prevent blood from flowing into the interventional sheath 10 from the distal end. The return line 120 is used to drain the perfusion fluid from the interventional sheath 10.

[0070] During use, the outflow channel 20 of the blood pumping device is pushed through the patient's blood vessels by the interventional sheath 10 until the outflow channel is located at the designated position in the patient's circulatory system. At this time, the outlet and inlet are located at different positions in the circulatory system, while the motor and the proximal end of the interventional sheath 10 remain outside the patient's body. When the motor starts, it drives the transmission component 200 to rotate, thereby causing blood to enter the outflow channel from the inlet and flow out from the outlet, realizing the blood pumping function of the device. Simultaneously, an external infusion pump continuously pumps perfusion fluid into the perfusion line 110 to the distal end of the sheath body 100, maintaining a certain pressure at the distal end of the sheath body 100 to prevent blood from the blood vessels from entering the sheath body 100 and clotting to form a thrombus. The perfusion fluid at the distal end of the sheath body 100 flows out of the body again through the return line 120.

[0071] In some other embodiments, unlike the previous embodiment, the sheath body 100 has an infusion conduit 110 but no return conduit 120. The infusion conduit 110 extends from the proximal end to the distal end of the interventional sheath 10 and communicates with the outflow channel 20, allowing the perfusion fluid to flow in from the proximal end of the interventional sheath 10 and out from the distal end via the infusion conduit 110, ultimately flowing into the patient's blood vessel after passing through the outflow channel 20. In this embodiment, the perfusion fluid also serves to maintain a certain pressure at the distal end of the interventional sheath 10, preventing blood from flowing into the interventional sheath 10 from the distal end.

[0072] In some other embodiments, unlike the previous embodiment, the blood pumping device further includes an inflow channel whose proximal end is connected to the distal end of the outflow channel, and the two internally form a connected blood flow channel. An suction port communicating with the flow channel is provided on the inflow channel. During use, the inflow channel and outflow channel 20 are pushed through the patient's blood vessels by the interventional sheath 10 until they are located at a designated position in the patient's circulatory system. At this time, the outflow outlet and suction port are located at different positions in the circulatory system, while the motor and the proximal end of the interventional sheath 10 remain outside the patient's body. When the motor starts, it drives the transmission assembly 200 to rotate, thereby causing blood to enter the flow channel from the suction port and flow out from the outflow outlet, realizing the blood pumping function of the device. Simultaneously, an external infusion pump continuously pumps perfusion fluid into the perfusion tubing 110 to the distal end of the sheath body 100, maintaining a certain pressure at the distal end of the sheath body 100 to prevent blood from the blood vessels from entering the sheath body 100 and clotting to form a thrombus. The perfusion fluid at the distal end of the sheath body 100 will flow out of the body again through the return line 120.

[0073] In some other embodiments, the blood pumping device further includes a flexible tubing, the proximal end of which is connected to the distal end of the outflow channel, and the distal end of which is connected to the proximal end of the inflow channel. The inflow channel, the flexible tubing, and the outflow channel together form an internally connected flow channel. Its working principle is the same as in the previous embodiment and will not be described in detail here.

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

[0075] It is understood that in this application, the proximal end refers to the end facing the operator or physician, and the distal end refers to the end away from the operator or physician. The proximal end of the interventional sheath 10 is connected to external devices such as motors and infusion pumps, and the distal end of the interventional sheath 10 is connected to the outflow channel 20.

[0076] After describing the overall structure of the blood pumping device, the interventional sheath 10 provided in the embodiments of this application will be introduced below with reference to the accompanying drawings. It should be noted that in the drawings, the direction extending along the line connecting the proximal and distal ends of the interventional sheath 10, and pointing from the distal end to the proximal end, is the first direction, denoted as x. In the drawings, for ease of drawing, the dimensions are not necessarily proportional to the actual dimensions. Figure 1 The arrow on the right side indicates the flow direction of the perfusion fluid.

[0077] Figure 2 A partial longitudinal cross-sectional schematic diagram of an example outflow channel and distal end of the interventional sheath after concealing the occupant assembly is shown. Figure 3 An example is shown. Figure 1 A magnified view of the distal end of the outflow channel and interventional sheath at position A.

[0078] Combination Figures 1 to 3 It is understood that the interventional sheath 10 includes a sheath body 100, a transmission assembly 200, a first bearing 300, and a occupant assembly 400. The sheath body 100 has an independent but interconnected infusion line 110 and a receiving cavity 130. The transmission assembly 200 is at least partially located within the receiving cavity 130. The first bearing 300 is located within the receiving cavity 130 and connected to the sheath body 100. The first bearing 300 is sleeved outside the transmission assembly 200 and has a flow channel 310 for the flow of infusion fluid. The occupant assembly 400 includes at least one occupant located within the receiving cavity 130. A flow channel 501 is formed within the occupant that is connected to both the infusion line 110 and the flow channel 310; or, the occupant and at least one of the sheath body 100, the transmission assembly 200, and the first bearing 300 form a flow channel 501 that is connected to both the infusion line 110 and the flow channel 310. The unilateral misalignment dimension of the flow channel 501 relative to the flow path 310 is less than or equal to the radial dimension of the flow path 310. It can be understood that the unilateral misalignment dimension between the flow channel 501 and the flow path 310 refers to the radial distance between the opposing surfaces on the same side of the flow channel 501 and the flow path 310, representing the degree of dimensional deviation and positional misalignment between the flow channel 501 and the flow path 310.

[0079] In some embodiments, the flow channel 310 includes a first inner peripheral surface 311 facing the transmission assembly 200 and a first outer peripheral surface 312 facing away from the transmission assembly 200, the distance between the first inner peripheral surface 311 and the first outer peripheral surface 312 being the radial dimension of the flow channel 310. Figure 3The flow channel 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. 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] Depending on the specific pipeline, the injection fluid can first flow through the flow channel 310, then through the flow pipeline 501, and finally out of the receiving cavity 130; or the injection fluid can first flow through the flow pipeline 501, then through the flow channel 310, and finally out of the receiving cavity 130.

[0081] In some of these implementations, both the sheath body 100 and the transmission assembly 200 extend along a first direction x, and at least a portion of the infusion line 110 is an annular cavity extending along the first direction x.

[0082] For ease of drawing and description, the x-direction in the figure is a straight line. However, the interventional sheath 10 actually has a certain degree of flexibility, which makes it easier for the interventional sheath 10 to be inserted into the blood vessel. Therefore, the extension direction of the central axis of the interventional sheath 10 can also be curved.

[0083] In some implementations, the sheath body 100 can be a cylinder, a square cylinder, or a polygonal cylindrical structure. This embodiment uses a cylinder as an example.

[0084] It should be noted that the transmission assembly 200 is an axisymmetric figure with a central axis, and the direction in which the central axis extends is consistent with the direction of the line connecting the proximal and distal ends of the intervention sheath 10, i.e., direction x in the figure. The first bearing is sleeved on the transmission assembly 200. The occupier can be a cylindrical structure sleeved on the transmission assembly 200, or it can be a component set independently of 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 perimeter of the cylinder, and the radial direction refers to the direction passing through the central axis in the radial plane, which usually also refers to the straight line direction along the diameter or radius, or the straight line direction perpendicular to the central axis. Radial dimension generally refers to the radius or diameter of an axisymmetric part, and in a pipeline, it can be understood as the width of the pipeline. For example, in this embodiment, the flow channel 310 is an annular pipeline, and its cross-sectional shape in the axial direction is an annular. The radial dimension of this pipeline is the distance L1 between the inner and outer circumferential surfaces of the annulus. It can be understood that in this application, the axial, circumferential, radial, and circumferential surfaces of other components can refer to the relevant description of the cylindrical structure mentioned above.

[0085] The first bearing 300 connects the transmission assembly 200 and the sheath body 100, allowing the transmission assembly 200 to rotate relative to the sheath body 100. Because the receiving cavity 130 needs to accommodate the first bearing 300, its axial cross-sectional area is larger than that of other cavities in the infusion return pipeline within the sheath body 100. To improve the versatility of the sheath body 100, and considering the limitations of manufacturing the receiving cavity 130 and the difficulty of installing the first bearing 300, the receiving cavity 130 is difficult to make only slightly larger than the first bearing 300, leaving no extra cavity after deducting the space occupied by the first bearing 300. Therefore, the receiving cavity 130 often still has a relatively large cavity after deducting the space occupied by the first bearing 300 and part of the transmission assembly 200. Furthermore, since the first bearing 300 is provided in the receiving cavity 130, the first bearing 300 will also cause a sudden change in the radial dimension of the flow path of the injection fluid in the receiving cavity 130, making it easy for air bubbles to remain and injection fluid to stagnate in the receiving cavity 130.

[0086] The blood pumping device provided in this embodiment, by providing an infusion line 110 connected to the receiving cavity 130, allows the infusion fluid to carry away the heat generated by the first bearing 300 and the particles generated by its rotation when flowing through the first bearing 300 in the receiving cavity 130, reducing wear on the first bearing 300 and thus improving the lifespan of the interventional sheath 10. Furthermore, by providing a spacer within the receiving cavity 130 for accommodating the first bearing 300, the spacer occupies excess space within the receiving cavity 130, reducing air bubble residue in the infusion drainage line. By forming a flow passage 501 that communicates with both the injection pipe 110 and the flow channel 310 within the occupant or between the occupant and at least one of the sheath body 100, the transmission assembly 200, and the first bearing 300, the flow passage 501 includes a second inner circumferential surface 502 and a second outer circumferential surface 503. 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. This reduces the difference in radial dimension between the flow channel 310 and other pipes in the receiving cavity 130, reduces the obstruction encountered by the injection fluid in the receiving cavity 130 when flowing through the flow channel 310 and the flow passage 501, thereby improving the fluidity of the injection fluid in the receiving cavity 130 and reducing the retention of the injection fluid in the receiving cavity 130. By optimizing the perfusion and drainage path and filling and covering the air venting dead zone on the perfusion and drainage path with the spacer component 400, this structure reduces the air venting dead zone and reduces the risk of blood backflow into the interventional sheath and air bubbles entering the body.

[0087] In some embodiments, the minimum distance between the centerline of the flow channel 310 and the centerline of the flow pipe 501 is less than or equal to the radial dimension L1 of the flow channel 310. Specifically, the minimum distance between the centerline 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 centerline of the flow pipe 501 and the second inner circumferential surface 502 and the second outer circumferential surface 503 is equal.

[0088] It's important to note that the centerline and axis of a pipeline are not the same concept. The centerline is the set of points within the pipeline that are equidistant from all points on its surface radially. When the pipeline is a standard circle, toroidal ring, or sector, the centerline is equidistant from all points on the outer surface. The axis is used to represent the axis of a body of revolution or a symmetrical body. When the pipeline is a standard circle, toroidal ring, or sector, the axis is the set of centers of the corresponding circles. When the pipeline is a cylindrical cavity, its centerline and axis are coplanar. When the pipeline is a toroidal cavity, its axis is a line passing through the center of the inner circumference of the ring. The centerline can be any line parallel to the axis on the circumferential surface between the inner and outer circumferential surfaces of the ring. In other words, the centerline of a toroidal pipeline forms a circumferential surface between its inner and outer circumferential surfaces.

[0089] In some optional embodiments, both the flow channel 310 and the flow pipe 501 are annular pipes surrounding the transmission assembly 200. The axis of the flow channel 310 is parallel to the axis of the flow pipe 501, and the distance between the axis of the flow channel 310 and the axis of the flow pipe 501 is less than or equal to the radial dimension of the flow channel 310. Since the first bearing 300 is sleeved on and connected to the transmission assembly 200, it is generally assumed 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 pipe 501 less than or equal to the radial dimension of the flow channel 310, the misalignment between the flow channel 310 and the flow pipe 501 is reduced, thereby reducing the obstruction encountered by the injection fluid in the receiving cavity 130 when flowing through the flow channel 310 and the flow pipe 501, thus improving the flowability of the injection fluid in the receiving cavity 130 and reducing the retention of the injection fluid in the receiving cavity 130.

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

[0091] In some optional embodiments, the axis of the flow channel 310 is collinear with the axis of the flow pipe 501, and the circumferential surface formed by the centerlines of the flow channel 310 intersects or is coplanar with the circumferential surface formed by the centerlines of the flow pipe 501. When the axis of the flow channel 310 is collinear with the axis of the flow pipe 501, and the circumferential surface formed by the centerlines of the flow channel 310 is coplanar with the circumferential surface formed by the centerlines of the flow pipe 501, the radial dimension of the flow pipe 501 is equal to the radial dimension L1 of the flow channel 310, and the angle between the first inner circumferential surface 311 and the second inner circumferential surface 502 is 180°, and the angle between the first outer circumferential surface 312 and the second outer circumferential surface 503 is 180°. When the axis of the flow channel 310 is collinear with the axis of the flow pipe 501, and the circumferential surface formed by the centerline of the flow channel 310 intersects with the circumferential surface formed by the centerline of the flow pipe 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 this 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 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 zone in the flow area are reduced. This reduces the obstruction encountered by the injection fluid in the receiving cavity 130 when flowing through the flow channel 310 and the flow pipe 501, as well as the impact on the flow wall, thereby improving the flowability of the injection fluid in the receiving cavity 130. It can be understood that setting the included angle between the two features related to the flow area to an obtuse angle in this application can generally achieve similar functions, and 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 channel 501 is equal to the radial dimension of the flow channel 310. It is understood that when the 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 this embodiment reduces the flow dead zone and blind zone in the flow area by making the directly connected flow channel 310 and flow pipe 501 not only have equal radial dimensions, but also make the surfaces of the flow channel 310 and flow pipe 501 flush or obtuse angles. This further reduces the obstruction encountered by the perfusion fluid in the receiving cavity 130 when it flows through the flow channel 310 and flow pipe 501, thereby improving the flowability of the perfusion fluid in the receiving cavity 130.

[0095] Figure 4 A longitudinal cross-sectional schematic diagram of an example first bearing is shown.

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

[0097] In this embodiment, the first bearing 300 can be a rolling bearing or a sliding bearing, etc., and the flow channel 310 can be approximated as an annular cavity surrounding the transmission assembly 200, extending along the first direction x. Depending on the type of the first bearing 300, the specific shape of the flow channel 310 may deviate from a perfectly circular annular cavity. Therefore, in this embodiment, the first inner circumferential surface 311 and the first outer circumferential surface 312 do not necessarily refer to physical surfaces, but can also refer to the virtual surface of the flow channel 310 facing the transmission assembly 200 and the virtual surface facing away from the transmission assembly 200, respectively. This embodiment uses a perfectly circular annular cavity as an example for illustration. The normals of the first inner circumferential surface 311 and the first outer circumferential surface 312 are perpendicular to the axis of the interventional sheath 10. The radial distance L1 between the first inner circumferential surface 311 and the first outer circumferential surface 312 in 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 perpendicular to the normal of the first inner circumferential surface 311). This distance L1 can be defined as the width of the flow channel 310.

[0098] It should be noted that the flow channel 501 is directly connected to the flow channel 310 of at least one first bearing 300. The flow channel 501 can also be approximated as an annular cavity surrounding the transmission assembly 200. 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 normals of the second inner circumferential surface 502 and the second outer circumferential surface 503 are not necessarily perpendicular to the axis of the interventional sheath 10. When the normals of the second inner circumferential surface 502 and the second outer circumferential surface 503 are perpendicular to the axis of the interventional sheath 10, the radial distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 is equal to the minimum distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 (the distance perpendicular to the normal of the second inner circumferential surface 502). When the normals of the second inner circumferential surface 502 and the second outer circumferential surface 503 are not perpendicular to the axis of the interventional sheath 10, both the second inner circumferential surface 502 and the second outer circumferential surface 503 can be considered as conical surfaces arranged around the axis of the interventional sheath 10. In this case, the radial distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 is greater than the minimum distance between the second inner circumferential surface 502 and the second outer circumferential surface 503 (the distance perpendicular to the normal of the second inner circumferential surface 502).

[0099] In some embodiments, the first inner circumferential surface 311 is connected to 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 to 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 is understood that when two surfaces are connected and the included angle between the two surfaces is 180°, the two surfaces can be considered flush.

[0100] The blood pumping device provided in this embodiment reduces the flow dead zone and blind zone in the flow area by making the directly connected flow channel 310 and flow pipe 501 not only have equal radial dimensions, but also make the surfaces of the flow channel 310 and flow pipe 501 flush or obtuse angles. This further reduces the obstruction encountered by the perfusion fluid in the receiving cavity 130 when it flows through the flow channel 310 and flow pipe 501, thereby improving the flowability of the perfusion fluid in the receiving cavity 130.

[0101] In some embodiments, the receiving cavity 130 includes a bearing receiving cavity, within which the first bearing 300 is located. The occupant assembly 400 includes a first occupant 401 located within the bearing receiving cavity, the first occupant 401 having a first conduit 500 communicating with the injection conduit 110, the radial dimension of the first conduit 500 being equal to the radial dimension of the flow channel 310.

[0102] The definition of the first pipeline 500 can be referred to the aforementioned flow pipeline 501.

[0103] In some embodiments, two first bearings 300 are provided in the same bearing housing cavity, spaced apart axially along the transmission assembly 200. The two first bearings 300 in the same bearing housing cavity have equal radial dimensions and the same dimensions of the flow channels 310. A first occupant 401 is located between the two first bearings 300, with its proximal and distal ends abutting against the two first bearings 300 respectively. When the injection fluid from the injection pipe 110 flows into the bearing housing cavity, it first flows through the flow channel 310 of one of the first bearings 300, then sequentially flows through the first pipe 500 and the flow channel 310 of the other first bearing 300 before exiting the bearing housing cavity.

[0104] The blood pumping device provided in this embodiment improves the support of the first bearing 300 for the transmission component 200 by simultaneously setting two first bearings 300 in the bearing housing cavity, reduces the vibration amplitude of the interventional sheath 10 during operation, and thus reduces the damage to the patient's blood vessels caused by the interventional sheath 10.

[0105] Figure 5 A schematic cross-sectional view of the first occupant of an example is shown.

[0106] like Figures 1 to 5 As shown, in some embodiments, the first occupant 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 a first conduit 500. The radial distance between the outer peripheral surface of the third sub-component 410 and the inner peripheral surface of the fourth sub-component 420 in the intervention sheath 10 is equal to the radial dimension of the flow channel 310.

[0107] Among them, the third sub-component 410 and the fourth sub-component 420 are both 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 and distal ends of the third sub-component 410 abut against the two first bearings 300, respectively, and the proximal and distal ends of the fourth sub-component 420 abut against the two first bearings 300, respectively.

[0109] In some embodiments, the outer peripheral surface of the third sub-component 410 is connected to the first inner peripheral surface 311, and the angle between the outer peripheral surface of the third sub-component 410 and the first inner peripheral surface 311 is equal to 180°. The inner peripheral surface of the fourth sub-component 420 is connected to the first outer peripheral surface 312, and the angle between the inner peripheral surface of the fourth sub-component 420 and the first outer peripheral surface 312 is equal to 180°. The normals of the outer peripheral surface of the third sub-component 410 and the inner peripheral surface of the fourth sub-component 420 are both perpendicular to the axis of the interventional sheath 10. The radial distance between the outer peripheral surface of the third sub-component 410 and the inner peripheral surface of the fourth sub-component 420 of the interventional sheath 10 is equal to the minimum distance between the outer peripheral surface of the third sub-component 410 and the inner peripheral surface of the fourth sub-component 420 (the distance perpendicular to the normal of the outer peripheral surface of the third sub-component 410). The radial distance between the outer circumferential surface of the third sub-component 410 and the inner circumferential surface of the fourth sub-component 420 in the intervention sheath 10 can be defined as the width of the first conduit 500. Figure 5 The width L1 of the flow channel 310 is equal to the width L2 of the first pipe 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 the radial dimension change of the perfusion fluid flow pipeline in the receiving cavity 130 by making the first inner peripheral surface 311 of the flow channel 310 flush with the outer peripheral surface of the third sub-component 410, and the first outer peripheral surface 312 of the flow channel 310 flush with the inner peripheral surface of the fourth sub-component 420, thereby improving the fluidity of the perfusion fluid in the receiving cavity 130 and reducing the retention of the perfusion fluid in the receiving cavity 130.

[0111] Figure 6A longitudinal cross-sectional schematic diagram of an example eighth and ninth occupant is shown.

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

[0113] Both the sixth transition cavity 160 and the bearing receiving cavity are cylindrical cavities, and the radial dimension of the sixth transition cavity 160 is smaller than the radial dimension of the bearing receiving cavity directly connected to it. The sixth transition cavity 160 can be located at the proximal end or the distal end of the receiving cavity 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 surrounding the transmission assembly 200. When the sixth transition cavity 160 is located at the proximal end of the bearing receiving cavity directly connected to it, the distances from the second surface 481 and the third surface 491 to the axis of the transmission assembly 200 gradually decrease from the distal end to the proximal end. When the sixth transition cavity 160 is located at the distal end of the bearing receiving cavity directly connected to it, the distances from the second surface 481 and the third surface 491 to the axis of the transmission assembly 200 gradually decrease from the proximal end to the distal end. Understandably, the third conduit 520, formed by the gap between the second surface 481 and the third surface 491, gradually approaches the axis of the transmission assembly 200 in a direction away from the bearing housing cavity directly connected to it.

[0114] Since the cavity 130 is provided with a flow channel 310 and a first pipe 500 that are interconnected, the third pipe 520 is directly or indirectly connected to the flow channel 310 and the first pipe 500.

[0115] In some embodiments, the radial distance between the second surface 481 and the third surface 491 of the intervention sheath 10 is ( Figure 6The dimension L3 in the middle is equal to the radial dimension L1 of the flow channel 310. The second surface 481 is connected to 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 to 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 should be explained that, since the normals of the second surface 481 and the third surface 491 are not perpendicular to the axis of the interventional sheath 10, the radial distance L3 between the second surface 481 and the third surface 491 in the interventional sheath 10 is greater than the minimum distance between the second surface 481 and the third surface 491 (the distance perpendicular to the normal of the second surface 481). Figure 6 The blood pumping device provided in this embodiment further includes a sixth transition cavity 160 communicating with the bearing cavity in the receiving cavity 130, and the radial dimension of the sixth transition cavity 160 is smaller than the radial dimension of the receiving cavity 130. The sixth transition cavity 160 serves as a transition cavity between the bearing cavity and other perfusion / drainage lines in the interventional sheath 10, reducing eddies generated when the perfusion fluid flows directly between the larger radial dimension receiving cavity 130 and the smaller radial dimension perfusion / drainage lines, thereby reducing the retention of the perfusion fluid in the receiving cavity 130. By making the radial distance L3 between the second surface 481 and the third surface 491 in the interventional sheath 10 equal to the width L1 of the flow channel 310, the widths of the connected third line 520, flow channel 310, and first line 500 are all consistent, improving the flowability of the perfusion fluid as it flows through the third line 520, flow channel 310, and first line 500. By connecting the second surface 481 to the first inner circumferential surface 311 and the third surface 491 to the first outer circumferential surface 312, and making the 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 obstruction encountered by the injection fluid when flowing through the third pipeline 520 and the flow channel 310 is reduced, and the impact of the injection fluid on the pipeline when flowing through the third pipeline 520 and the flow channel 310 is reduced, thereby further improving the fluidity of the injection fluid.

[0117] Figure 7 A partial longitudinal cross-sectional schematic diagram of the proximal end of an example interventional sheath is shown; Figure 8 A partial longitudinal cross-sectional view of the proximal end of an example interventional sheath is shown after concealing the occupant assembly, the first plug, and the second plug. Figure 7 The arrow at the top center indicates the flow direction of the infusion fluid.

[0118] like Figures 1 to 8As shown, in some embodiments, the bearing receiving cavity includes a proximal receiving cavity 131 and a distal receiving cavity 132. The sheath body 100 also has an extension cavity 140 extending proximally to distally, the extension cavity 140 directly or indirectly connecting the proximal receiving cavity 131 and the distal receiving cavity 132. At least a portion of the transmission assembly 200 extends from the proximal receiving cavity 131 to the distal receiving cavity 132 via the extension cavity 140. At least one first bearing 300 is provided in both the proximal receiving cavity 131 and the distal receiving cavity 132. A third sub-component 410 and a fourth sub-component 420 are provided in at least one of the proximal receiving cavity 131 and the distal receiving cavity 132.

[0119] The proximal receiving cavity 131 is located at the proximal end of the sheath body 100, and the distal receiving cavity 132 is located at the distal end of the sheath body 100. During use, the proximal receiving cavity 131 is located outside the patient's body, and the distal receiving cavity 132 is located inside the patient's blood vessel. The transmission assembly 200 extends from the proximal receiving cavity 131 into the distal receiving cavity 132 via an extension cavity 140, allowing the motor for driving the transmission assembly 200 to be located outside the patient's body and connected to the proximal end of the transmission assembly 200.

[0120] In some embodiments, both the proximal receiving cavity 131 and the distal receiving cavity 132 are provided with a third sub-component 410, a fourth sub-component 420, and two first bearings 300. The sheath body 100 is provided with two sixth transition cavities 160, one located at the distal end of the distal receiving cavity 132 and directly communicating with it, and the other located at the distal end of the proximal receiving cavity 131 and communicating with the extension cavity 140. The radial dimensions of the first bearings 300 in the proximal receiving cavity 131 and the distal receiving cavity 132 may be the same or different. When the radial dimensions of the first bearing 300 in the proximal receiving cavity 131 and the distal receiving cavity 132 are different, the dimensions of the first occupant 401 located in the proximal receiving cavity 131 and the distal receiving cavity 132 are adjusted according to the dimensions of the first bearing 300 in the bearing receiving cavity in which it is located. The dimensions of the sixth transition cavity 160, which is directly connected to the proximal receiving cavity 131 and the distal receiving cavity 132, and the eighth occupant 480 and the ninth occupant 490 located in the sixth transition cavity 160 are adjusted according to the dimensions of the first bearing 300 in the bearing receiving cavity directly connected to them.

[0121] The blood pumping device provided in this embodiment, by placing the motor externally, results in a smaller radial dimension of the interventional sheath 10 compared to a solution with an internal motor, thus reducing the difficulty of intervention and the damage to the patient's blood vessels. By providing two first bearings 300 in both the proximal receiving cavity 131 and the distal receiving cavity 132, the support of the first bearings 300 for the transmission assembly 200 is further improved, reducing the vibration amplitude of the interventional sheath 10 during operation, thereby reducing the damage to the patient's blood vessels caused by the interventional sheath 10.

[0122] After describing the bearing housing cavity and the sixth transition cavity, the following describes several ways to implement other cavities in the housing cavity with reference to the accompanying drawings.

[0123] like Figures 1 to 3 As shown, in some embodiments, the receiving cavity 130 further includes a first transition cavity 101 connecting the distal receiving cavity 132 and the extension cavity 140. The radial dimension of the distal receiving cavity 132 is larger than the radial dimension of the extension cavity 140, and the radial dimension of the outer peripheral surface of the first transition cavity 101 gradually decreases from the distal end to the proximal end. The occupant assembly 400 also includes a third occupant 430, which has a first surface 431 facing away from the transmission assembly 200. 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 cavity 101 forms a fourth conduit 530 connecting the flow channel 310 and the extension cavity 140.

[0124] The first transition cavity 101 is a frustum-shaped cavity. The radial dimension of the outer peripheral surface of the first transition cavity 101 gradually decreases from the distal end to the proximal end. Therefore, the outer peripheral surface of the first transition cavity 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 radial distance between the conical surface 1011 of the first transition cavity 101 and the first surface 431 of the intervention sheath 10 is ( Figure 3 The dimension L4 in the first transition cavity 101 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 receiving cavity 132, and 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 receiving cavity 132. The angle between the first surface 431 and the first inner circumferential surface 311 is greater than 90° and less than 180°, and 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 normals of the conical surfaces 1011 of the first surface 431 and the first transition cavity 101 are not perpendicular to the axis of the interventional sheath 10, the radial distance L4 between the first surface 431 and the conical surfaces 1011 of the first transition cavity 101 in the interventional sheath 10 is greater than the minimum distance between the first surface 431 and the conical surfaces 1011 of the first transition cavity 101 (the distance perpendicular to the normal of the first surface 431). Figure 3 (Dimension L7 in the middle).

[0127] The blood pumping device provided in this embodiment improves the flowability of the perfusion fluid as it flows through the flow channel 310 and the fourth conduit 530 by making the radial distance L4 between the conical surface 1011 of the first transition cavity 101 and the first surface 431 of the intervention sheath 10 equal to the width L1 of the flow channel 310. This ensures that the widths of the connected flow channel 310 and the fourth conduit 530 are consistent. Furthermore, by connecting the first surface 431 to the first inner circumferential surface 311 and the conical surface 1011 of the first transition cavity 101 to the first outer circumferential surface 312, and by ensuring that the angles between the first surface 431 and the first inner circumferential surface 311, and between the conical surface 1011 of the first transition cavity 101 and the first outer circumferential surface 312 are both obtuse angles, the obstruction encountered by the perfusion fluid when flowing through the fourth conduit 530 and the flow channel 310 is reduced, and the impact of the perfusion fluid on the conduit when flowing through the fourth conduit 530 and the flow channel 310 is also reduced, further improving the flowability of the perfusion fluid.

[0128] In some embodiments, the transmission assembly 200 includes a first drive shaft 210 and an impeller 230 interconnected, the first drive shaft 210 extending from a first transition cavity 101 to an extension cavity 140. The impeller 230 includes an impeller shaft 231 and an impeller body 232 interconnected, the impeller body 232 extending from a distal receiving cavity 132 to an outlet channel 20. At least a portion of the impeller shaft 231 is fitted outside the first drive shaft 210 and extends from the first transition cavity 101 to the distal receiving cavity 132 and is connected to the impeller body 232. The radial dimension of the impeller shaft 231 is larger than the radial dimension of the first drive shaft 210. The third occupant 430 includes a first sub-part 432 and a second sub-part 433, the first sub-part 432 being fitted outside the impeller shaft 231 and the second sub-part 433 being fitted outside the first drive shaft 210, the first sub-part 432 being located at the distal end of the second sub-part 433. The distance between the first surface 431 of the first sub-component 432 and the axis of the transmission assembly 200, and the distance between the first surface 431 of the second sub-component 433 and the axis of the transmission assembly 200, both gradually decrease from the distal end to the proximal end. The distance between the first surface 431 of the first sub-component 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-component 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-component 433 may extend partially into the extension cavity 140.

[0130] In some embodiments, the sheath body 100 has a second outlet 106 extending axially on its distal end face, the second outlet 106 connecting the distal end of the distal receiving cavity 132 and the outflow channel 20. The distal end of the impeller shaft 231 extends out of the distal receiving cavity 132 from the second outlet 106 and connects to the impeller body 232 located in the outflow channel 20, the proximal end of the impeller shaft 231 extending into the first transition cavity 101 from the distal receiving cavity 132 and covering part of the first drive shaft 210. The perfusion line 110 is connected to the distal receiving cavity 132 through the second outlet 106, most of the perfusion fluid flows into the distal receiving cavity 132 at the second outlet 106 and flows out of the interventional sheath 10 through the first transition cavity 101 and the return line 120, a small portion of the perfusion fluid 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 interventional sheath 10 from the second outlet 106 and causing thrombosis.

[0131] In some embodiments, the first drive shaft 210 is a flexible rotating shaft with greater elasticity than the impeller 230. The two first bearings 300 in the distal receiving cavity 132 are both sleeved on the impeller shaft 231 to support the impeller shaft 231.

[0132] The blood pumping device provided in this embodiment includes a first drive shaft 210 and an impeller 230 in the transmission assembly 200. The first drive shaft 210 extends from the first transition cavity 101 to the extension cavity 140, and the elasticity of the first drive shaft 210 is greater than that of the impeller 230. This improves the blood delivery capacity of the impeller 230, which has less elasticity and stronger rigidity. Furthermore, the first drive shaft 210, which has better elasticity, extends from the distal end of the interventional sheath 10 to the proximal end through the extension cavity 140. This improves the elasticity of the interventional sheath 10 while achieving torque transmission, thereby reducing the difficulty of the interventional sheath 10 when it is inserted into the patient's blood vessels. By including a first sub-component 432 and a second sub-component 433 in the third occupier 430, the first sub-component 432 and the second sub-component 433 are respectively sleeved on the impeller 230 and the first drive shaft 210. The first sub-component 432 and the second sub-component 433 can fill the cavity caused by the different radial dimensions of the impeller 230 and the first drive shaft 210, thereby reducing the gas residue in the first transition cavity 101 and reducing the impact of the injection fluid on the pipeline when it flows through the flow channel 310 and the first transition cavity 101, thus further improving the fluidity of the injection fluid.

[0133] Figure 9 A partial longitudinal cross-sectional schematic diagram of an example second drive shaft is shown; Figure 10 An axial cross-sectional schematic diagram of an example fourth and fifth spacer is shown.

[0134] like Figures 7 to 10As shown, in some embodiments, the receiving cavity 130 further includes a second transition cavity 102, and the sheath body 100 also has a power cavity 170. The proximal receiving cavity 131, the second transition cavity 102, and the power cavity 170 are arranged sequentially from the distal end to the proximal end. The transmission assembly 200 also includes a second transmission shaft 220, which is coaxially connected to the first transmission shaft 210. The second transmission shaft 220 extends from the power cavity 170 through the proximal receiving cavity 131 into the extension cavity 140 and is connected to the first transmission shaft 210. The second transmission shaft 220 includes a first sub-shaft 221, a second sub-shaft 222, and a third sub-shaft 223 arranged sequentially from the distal end to the proximal end. At least a portion of the first sub-shaft 221 is located within the proximal receiving cavity 131, the second sub-shaft 222 is located in the second transition cavity 102, and at least a portion 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 occupant assembly 400 also includes a fourth occupant 440 and a fifth occupant 450, both located within the second transition cavity 102. The fourth occupant 440 is sleeved outside the second sub-shaft 222, and the fifth occupant 450 is sleeved outside the fourth occupant 440. The gap between the fourth occupant 440 and the fifth occupant 450 forms a second conduit 510, which communicates with the flow channel 310 within the proximal receiving cavity 131.

[0135] The power chamber 170 is used to house the motor that drives 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 larger than that of the second sub-shaft 222 because the third sub-shaft 223 needs to extend into the power chamber 170 and connect to the motor. The radial dimension of the first sub-shaft 221 is larger than that of the second sub-shaft 222 because the first sub-shaft 221 needs to extend into the proximal receiving cavity 131 to carry the first bearing 300, and needs to further extend into the extension cavity 140 to connect 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 receiving cavity 131 decrease sequentially. Since the power cavity 170 needs to accommodate the motor that drives the transmission assembly 200 to rotate, the power cavity 170 needs to have a large space in order to ensure the driving force of the motor.

[0137] In some embodiments, the first sub-shaft 221 is connected to the first drive shaft 210 by means of a sleeve or coupling, etc. The connection position of the first sub-shaft 221 and the first drive shaft 210 is located on the proximal side of the extension cavity 140, so that the second drive shaft 220 can be located outside the patient's body when the blood pumping device is in use. The elasticity of the first drive shaft 210 is greater than that of the second drive shaft 220, which can also reduce the difficulty of the interventional sheath 10 when intervening in the patient's blood vessels while ensuring the torque transmission capacity of the second drive shaft 220.

[0138] In some embodiments, both the fourth occupant 440 and the fifth occupant 450 are cylindrical structures, and the second conduit 510 is an annular conduit. Since the normals to the outer circumferential surface of the fourth occupant 440 and the inner circumferential surface of the fifth occupant 450 are perpendicular to the axis of the interventional sheath 10, the distance between the outer circumferential surface of the fourth occupant 440 and the inner circumferential surface of the fifth occupant 450 (the radial dimension of the second conduit 510)... Figure 7 The dimension L5 can be defined as the width of the second pipe 510, and the width L1 of the flow channel 310 is equal to the width L5 of the second pipe 510. The outer peripheral surface of the fourth occupant 440 is connected to the first inner peripheral surface 311 of the first bearing 300 located in the proximal receiving cavity 131, and the included angle between the outer peripheral surface of the fourth occupant 440 and the first inner peripheral surface 311 of the first bearing 300 located in the proximal receiving cavity 131 is equal to 180°. The inner peripheral surface of the fifth occupant 450 is connected to the first outer peripheral surface 312 of the first bearing 300 located in the proximal receiving cavity 131, and the included angle between the inner peripheral surface of the fifth occupant 450 and the first outer peripheral surface 312 of the first bearing 300 located in the proximal receiving cavity 131 is equal to 180°.

[0139] In some embodiments, the fifth occupier 450 has a notch 451 that extends radially through it, and the injection pipe 110 is directly or indirectly connected to the second pipe 510 through the notch 451. This embodiment illustrates an example where the notch 451 directly connects the injection pipe 110 and the second pipe 510. The fourth occupier 440 is a cylinder fitted outside the second sub-shaft 222, and the fifth occupier 450 is a cylinder fitted outside the fourth occupier 440, with the notch 451 on it.

[0140] The blood pumping device provided in this embodiment reduces the radial dimension change of the flow path of the perfusion fluid when it flows through the second transition cavity 102 and the flow channel 310 by setting a fourth occupant 440 and a fifth occupant 450 in the second transition cavity 102, thereby improving the fluidity of the perfusion fluid between the proximal receiving cavity 131 and the second transition cavity 102 and reducing the retention of the perfusion fluid between the proximal receiving cavity 131 and the second transition cavity 102. By making the width L1 of the flow channel 310 equal to the width L5 of the second pipe 510, and by making the outer peripheral surface of the fourth occupant 440 flush with the first inner peripheral surface 311 of the first bearing 300 located in the proximal receiving cavity 131, and the inner peripheral surface of the fifth occupant 450 flush with the first outer peripheral surface 312 of the first bearing 300 located in the proximal receiving cavity 131, the obstruction encountered by the injection fluid in the receiving cavity 130 when flowing through the flow channel 310 and the second pipe 510 is reduced, thereby improving the flowability of the injection fluid in the receiving cavity and reducing the retention of the injection fluid in the receiving cavity.

[0141] After describing the other cavities in the receiving cavity, the following describes several ways of implementing other components in the interventional sheath with reference to the accompanying drawings.

[0142] like Figure 7 and Figure 8 As shown, in some embodiments, the sheath body 100 further includes a third transition cavity 103 located between the power cavity 170 and the second transition cavity 102. The general dimension of the third transition cavity 103 is smaller than the radial dimensions of the power cavity 170 and the second transition cavity 102. The blood pumping device also includes a first plug 600 located within the third transition cavity 103. The third transition cavity 103 allows the third sub-shaft 223 to extend into the power cavity 170. The first plug 600 is a cylinder fitted onto the third sub-shaft 223 and can be understood as a flange sealing the power cavity 170. The radial dimension of the third transition cavity 103 is smaller than the radial dimensions of the second transition cavity 102 and the power cavity 170.

[0143] The blood pumping device provided in this embodiment not only seals the power chamber 170 by setting a first plug 600 in the third transition chamber 103 to prevent the perfusion fluid from flowing into the power chamber 170 from the third transition chamber 103, but also occupies the extra cavity and reduces the residual air bubbles.

[0144] In some embodiments, the end face of the first plug 600 facing the proximal receiving cavity 131 is equal to the end face of the fourth occupant 440 facing the power cavity 170 and the end face of the fifth occupant 450 facing the power cavity 170, thereby improving the blocking ability of the first plug 600 on the injection fluid in the third transition cavity 103, optimizing the injection path, and reducing dead zones.

[0145] like Figures 1 to 8 As shown, in some embodiments, the sheath body 100 is further provided with a return pipe 120 communicating with the receiving cavity 130. The infusion fluid of the infusion pipe 110 flows through the first bearing 300 and the first pipe 500 and then flows to the return pipe 120. At least part of the return pipe 120 is composed of the cavity after the transmission component 200 is removed from the extension cavity 140.

[0146] In some embodiments, the sheath body 100 further includes a fourth transition cavity 104 and a fifth transition cavity 150, and a first outlet 105 communicating with the fourth transition cavity 104 is provided on the outer circumferential surface of the sheath body 100. Both the fourth transition cavity 104 and the fifth transition cavity 150 are cylindrical cavities. The fourth transition cavity 104 extends axially along the sheath body 100, and the fifth transition cavity 150 extends radially along the sheath body 100. The fifth transition cavity 150 communicates with the middle section of the extension cavity 140 and the fourth transition cavity 104. The perfusion fluid in the extension cavity 140 flows out of the interventional sheath 10 sequentially through the fifth transition cavity 150, the fourth transition cavity 104, and the first outlet 105. The blood pumping device also includes a second plug 610, located on the side of the fourth transition cavity 104 opposite to the first outlet 105. At least a portion of the return conduit 120 is formed by removing the second plug 610 from the fourth transition cavity 104. The second plug 610 is a cylindrical member extending along the first direction x, and the radial dimension of the second plug 610 is equal to the radial dimension of the fourth transition cavity 104. In some embodiments, the return pipe 120 is composed of a first outlet 105, a fifth transition cavity 150, the cavity of the fourth transition cavity 104 after removing the second plug 610, and the cavity of the extension cavity 140 after removing the transmission assembly 200. The sheath body 100 is provided with two independently arranged infusion pipes 110, one of which is an infusion pipe 110 ( Figure 7 The infusion line 110 is connected to the proximal end of the proximal receiving cavity 131, and another infusion line 110 ( Figure 1 The perfusion tubing 110 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 receiving cavity 132, and communicates with the second outlet 106 for delivering perfusion fluid to the distal receiving cavity 132. External perfusion fluid flows into the interventional sheath 10 from both perfusion tubing lines 110. One perfusion line flows from the proximal end of the proximal receiving cavity 131 to the distal end, and after passing through the extension cavity 140, the fifth transition cavity 150, and the fourth transition cavity 104, flows out of the interventional sheath 10 from the first outlet 105. Figure 7 and Figure 8 (As shown). Another infusion fluid flows from the distal end of the distal receiving cavity 132 to the proximal end, then flows through the extension cavity 140 to the fifth transition cavity 150 where it merges with the other infusion fluid and flows out of the interventional sheath 10 from the first outlet 105. Figures 1 to 3 (As shown).

[0147] In some embodiments, both the fifth transition cavity 150 and the fourth transition cavity 104 are cylindrical cavities. A hole is drilled along the axial direction on the end face of the sheath body 100, and then the opening on the end face of the sheath body 100 is plugged with a plug, leaving the remaining cavity as the fourth transition cavity 104. A hole is drilled along the axial direction on the outer circumferential surface of the sheath body 100 until it communicates with both the fourth transition cavity 104 and the extension cavity 140, and then the opening on the outer circumferential surface of the sheath body 100 is plugged with a plug, leaving the remaining cavity as the fifth transition cavity 150. The second plug 610 is located at the end of the fourth transition cavity 104 opposite to the first outlet 105. It can also be understood that the second plug 610 also functions as a plug, ensuring that when the perfusion fluid flows from the fifth transition cavity 150 to the fourth transition cavity 104, it only flows along the first direction x towards the first outlet 105, and does not flow into the dead cavity on the other side, preventing perfusion fluid stagnation.

[0148] In some embodiments, the end face of the second plug 610 facing the fourth transition cavity 104 is flush with the end face of the fifth transition cavity 150, thereby improving the ability of the second plug 610 to block the injection fluid in the fourth transition cavity 104 and the fifth transition cavity 150, optimizing the injection path, and reducing dead zones.

[0149] The blood pumping device provided in this embodiment, by diverting the perfusion fluid into two perfusion lines 110 flowing into the proximal receiving cavity 131 and the distal receiving cavity 132 respectively, avoids the perfusion fluid carrying particles into the other bearing receiving cavity after flushing one bearing receiving cavity, thus improving the flushing ability of the perfusion fluid on the first bearing 300. By directing the perfusion fluid from the distal end to the proximal end of the distal receiving cavity 132, particles generated by the first bearing 300 will flow out from the proximal end of the distal receiving cavity 132, reducing the risk of particles flowing into the patient's blood vessels from the second outlet 106. By setting a second plug 610 occupying the dead space 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 unidirectionally to the first outlet 105, and will not flow back into the dead space causing perfusion fluid retention.

[0150] Of course, in other embodiments, the interventional sheath 10 may also be provided with two independent return lines 120, through which the perfusion fluid of the proximal receiving cavity 131 and the distal receiving cavity 132 flows out of the interventional sheath 10 respectively. The interventional sheath 10 may also contain only the perfusion line 110 and no return line 120. The perfusion fluid flows from the proximal end of the interventional sheath 10 into the proximal receiving cavity 131 and then through the extension cavity 140 to the distal receiving cavity 132, and finally flows into the patient's blood vessel from the second outlet 106.

[0151] In other embodiments, the motor is arranged with internal drive, and is also housed within the distal receiving cavity 132. The transmission assembly 200 extends only from the distal receiving cavity 132 to the outflow channel 20. The power supply and control lines of the motor extend through the extension cavity 140 to the proximal end of the interventional sheath 10 and finally protrude from the interventional sheath 10. In this embodiment, the occupant assembly 400 can still occupy the excess cavity in the distal receiving cavity 132 without affecting the operation of the motor, thereby reducing the concern about air bubble residue in the drainage line.

[0152] In addition, this application also provides an interventional sheath 10, including a sheath body 100, a transmission assembly 200, a first bearing 300, and a occupant assembly 400. The sheath body 100 has an infusion line 110 and a receiving cavity 130 that are independent but interconnected. The transmission assembly 200 is at least partially located within the receiving cavity 130. The first bearing 300 is located within the receiving cavity 130 and connected to the sheath body 100. The first bearing 300 is sleeved outside the transmission assembly 200 and has a flow channel 310 for the flow of infusion fluid. The occupant assembly 400 includes at least one occupant located within the receiving cavity 130. The occupant forms a flow channel 501 that is interconnected with both the infusion line 110 and the flow channel 310; or, the occupant and at least one of the sheath body 100, the transmission assembly 200, and the first bearing 300 form a flow channel 501 that is interconnected with both the infusion line 110 and the flow channel 310. The unilateral displacement dimension of the flow pipe 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 includes a first inner peripheral surface 311 facing the transmission assembly 200 and a first outer peripheral surface 312 facing away from the transmission assembly 200, wherein the distance 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 conduit 501 includes a second inner peripheral surface 502 facing the transmission assembly 200 and a second outer peripheral surface 503 facing away from the transmission assembly 200, wherein the distance between the second inner peripheral surface 502 and the first inner peripheral surface 311, and the distance 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 interventional sheath 10 in this embodiment can be used in the blood pumping device of any of the above embodiments. The interventional sheath 10 in this embodiment and the interventional sheath 10 in the blood pumping device described above can produce the same technical effect, which will not be described again here.

[0155] In addition, this application also provides a blood pumping device, which includes an interventional sheath 10 and an outflow channel 20. The interventional sheath 10 includes a sheath body 100, a transmission assembly 200, a first bearing 300, and a occupant assembly 400. The sheath body 100 has an independent but interconnected perfusion line 110 and a receiving cavity 130 inside. The transmission assembly 200 is at least partially located within the receiving cavity 130. The first bearing 300 is located within the receiving cavity 130 and connected to the sheath body 100. The first bearing 300 is sleeved outside the transmission assembly 200, and a flow channel 310 for perfusion fluid is provided inside the first bearing 300. The flow channel 310 includes a first inner peripheral surface 311 facing the transmission assembly 200 and a first outer peripheral surface 312 facing away from the transmission assembly 200. The distance 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 occupant assembly 400 includes at least one occupant located within the receiving cavity 130. A flow passage 501 is formed within the occupant or between the occupant and at least one of the sheath body 100, the transmission assembly 200, and the first bearing 300, which is connected to the infusion line 110 and the flow channel 310. The angle between the extension direction of the flow passage and the extension direction of the flow channel is greater than 90° and less than or equal to 180°.

[0156] In addition, this application also provides an interventional sheath 10, including a sheath body 100, a transmission assembly 200, a first bearing 300, and a occupant assembly 400. The sheath body 100 has an independent but interconnected infusion line 110 and a receiving cavity 130 inside. The transmission assembly 200 is at least partially located within the receiving cavity 130. The first bearing 300 is located within the receiving cavity 130 and connected to the sheath body 100. The first bearing 300 is sleeved outside the transmission assembly 200, and a flow channel 310 for the flow of infusion fluid is provided inside the first bearing 300. The flow channel 310 includes a first inner circumferential surface 311 facing the transmission assembly 200 and a first outer circumferential surface 312 facing away from the transmission assembly 200. The distance between the first inner circumferential surface 311 and the first outer circumferential surface 312 is the radial dimension L1 of the flow channel 310. The occupant assembly 400 includes at least one occupant located within the receiving cavity 130. A flow passage 501 is formed within the occupant or between the occupant and at least one of the sheath body 100, the transmission assembly 200, and the first bearing 300, which is connected to the infusion line 110 and the flow channel 310. The angle between the extension direction of the flow passage and the extension direction of the flow channel is greater than 90° and less than or equal to 180°.

[0157] The aforementioned blood pumping device reduces the dead zone and blind zone in the flow area by setting the angle between the extension direction of the flow channel 501 and the extension direction of the flow channel 310 to an obtuse angle, thereby reducing the obstruction encountered by the perfusion fluid when flowing through the flow channel 501 and the flow channel 310, and reducing the impact of the perfusion fluid on the pipeline when flowing through the flow channel 501 and the flow channel 310, thus further improving the fluidity of the perfusion fluid.

[0158] The interventional sheath 10 in this embodiment can be used in the blood pumping device of the above embodiment. The interventional sheath 10 in this embodiment and the interventional sheath 10 in the blood pumping device can produce the same technical effect, which will not be described again here.

[0159] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A blood pumping device, characterized in that, The interventional sheath includes an interventional sheath and an outflow channel located at the distal end of the interventional sheath, the interventional sheath comprising: The sheath body has a connected receiving cavity and an infusion pipeline inside; The transmission assembly is at least partially located within the receiving cavity; A first bearing is located inside the receiving cavity and connected to the sheath body. The first bearing is sleeved outside the transmission assembly, and a flow channel for the flow of perfusion fluid is provided inside the first bearing. The occupant assembly includes at least one occupant located within the receiving cavity, wherein a flow passage is formed within the occupant or between the occupant and at least one of the sheath body, the transmission assembly, and the first bearing, and the flow passage is in communication with the infusion line and the flow channel; The unilateral offset dimension of the flow conduit relative to the flow channel is less than or equal to the radial dimension of the flow channel.

2. The blood pumping device according to claim 1, characterized in that, The minimum distance between the centerline of the flow channel and the centerline of the flow pipe 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 includes a first inner circumferential surface facing the transmission assembly and a first outer circumferential surface facing away from the transmission assembly. The flow conduit includes a second inner circumferential surface facing the transmission assembly and a second outer circumferential surface facing away from the transmission assembly. The unilateral displacement dimension of the flow conduit relative to the flow channel is the distance between the second inner circumferential surface and the first inner circumferential surface, or the unilateral displacement dimension of the flow conduit relative to the flow channel is the distance between the second outer circumferential surface and the first outer circumferential surface.

4. The blood pumping device according to claim 3, characterized in that, Both the flow channel and the circulation pipe are annular pipes arranged around the transmission assembly. The axis of the flow channel is parallel to the axis of the circulation pipe, and the distance between the axis of the flow channel and the axis of the circulation pipe 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 conduit.

5. The blood pumping device according to claim 4, characterized in that, The circumferential surface formed by the centerline of the flow channel intersects or is coplanar with the circumferential surface formed by the centerline of the flow pipe.

6. The blood pumping device according to claim 5, characterized in that, The first inner circumferential surface is connected to the second inner circumferential surface, and the first outer circumferential surface is connected to the second outer circumferential surface. The radial dimension of the flow pipe is equal to the radial dimension of the flow channel.

7. The blood pumping device according to claim 1, characterized in that, 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 conduit 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, and the 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 angle between the first inner circumferential surface and the second inner circumferential surface is greater than 90° and less than or equal to 180°.

8. The blood pumping device according to claim 7, characterized in that, The receiving cavity includes a bearing receiving cavity, and the first bearing is located within the bearing receiving cavity; The occupant assembly includes a first occupant located in the bearing receiving cavity, the first occupant having a first conduit communicating with the injection conduit, the radial dimension of the first conduit being equal to the radial dimension of the flow channel.

9. The blood pumping device according to claim 8, characterized in that, Two first bearings are provided in the same bearing housing cavity, which are spaced apart along the axial direction of the transmission assembly, and the first occupant is located between the two first bearings.

10. The blood pumping device according to claim 8, characterized in that, The first occupant includes a third sub-component and a fourth sub-component. The third sub-component is sleeved outside the transmission assembly, and the fourth sub-component is sleeved outside the third sub-component. The gap between the third sub-component and the fourth sub-component forms the first conduit. The distance between the outer circumferential surface of the third sub-component and the inner circumferential surface of the fourth sub-component in the radial direction of the intervention sheath is equal to the radial dimension of the flow channel.

11. The blood pumping device according to claim 10, characterized in that, The proximal and distal ends of the third sub-component respectively abut against the two first bearings, and the proximal and distal ends of the fourth sub-component respectively abut against the two first bearings.

12. The blood pumping device according to claim 8, characterized in that, The bearing receiving cavity includes a proximal receiving cavity and a distal receiving cavity; the sheath body also has an extension cavity extending from the proximal end to the distal end, the extension cavity directly or indirectly connecting the proximal receiving cavity and the distal receiving cavity, at least a portion of the transmission assembly extends from the proximal receiving cavity to the distal receiving cavity via the extension cavity, and at least one of the proximal receiving cavity and the distal receiving cavity is provided with at least one of the first bearings; at least one of the proximal receiving cavity and the distal receiving cavity is provided with the first occupant.

13. The blood pumping device according to claim 12, characterized in that, The receiving cavity further includes a first transition cavity connecting the distal receiving cavity and the extension cavity, wherein the radial dimension of the distal receiving cavity is larger than the radial dimension of the extension cavity, and the radial dimension of the first transition cavity gradually decreases from the distal end to the proximal end. The occupant assembly further includes a third occupant, which is located inside the first transition cavity and sleeved outside the transmission assembly. The third occupant has a first surface facing away from the transmission assembly. The distance between the first surface and the axis of the transmission assembly gradually decreases from the distal end to the proximal end. The gap between the first surface and the conical surface of the first transition cavity forms a fourth conduit connecting the flow channel and the extension cavity.

14. The blood pumping device according to claim 13, characterized in that, The distance between the first surface and the conical surface of the first transition cavity in the radial direction of the intervention sheath is equal to the radial dimension of the flow channel; The first surface is connected to the first inner circumferential surface and the 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 to the first outer circumferential surface and the 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 according to claim 13, characterized in that, The transmission assembly includes a first transmission shaft and an impeller connected to each other. The first transmission shaft extends from the first transition cavity to the extension cavity. The impeller includes an impeller shaft and an impeller body connected to each other. The impeller body extends from the distal receiving cavity to the outflow channel. At least a portion of the impeller shaft is sleeved outside the first transmission shaft and extends from the first transition cavity to the distal receiving cavity and is connected to the impeller body. The third occupant includes a first sub-component and a second sub-component. The first sub-component is sleeved outside the impeller shaft, and the second sub-component is sleeved outside the first transmission shaft. The first sub-component is located at the distal end of the second sub-component. The distance between the first surface of the first sub-component and the axis of the transmission assembly, and the distance between the first surface of the second sub-component and the axis of the transmission assembly, both gradually decrease from the distal end to the proximal end. Furthermore, the distance between the first surface of the first sub-component 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-component and the conical surface of the first transition cavity in the radial direction of the interventional sheath.

16. The blood pumping device according to claim 12, characterized in that, The receiving cavity further includes a second transition cavity, and the sheath body is also provided with a power cavity. The proximal receiving cavity, the second transition cavity, and the power cavity are arranged sequentially from the distal end to the proximal end. The transmission assembly includes a first transmission shaft and a second transmission shaft coaxially connected. At least a portion of the first transmission shaft is located within the extension cavity. The second transmission shaft extends from the power cavity through the proximal receiving cavity into the extension cavity and is connected to the first transmission shaft. The second transmission shaft includes a first sub-shaft, a second sub-shaft, and a third sub-shaft arranged sequentially from the distal end to the proximal end. At least a portion of the first sub-shaft is located within the proximal receiving cavity. The second sub-shaft is located in the second transition cavity. At least a portion 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 sub-shaft and the third sub-shaft. The occupant assembly further includes a fourth occupant and a fifth occupant, both located within the second transition cavity. The fourth occupant is sleeved outside the second sub-shaft, and the fifth occupant is sleeved outside the fourth occupant. The gap between the fourth occupant and the fifth occupant forms a second conduit, which communicates with the flow channel within the proximal receiving cavity.

17. The blood pumping device according to claim 16, characterized in that, The fifth occupant has a notch that penetrates the fifth occupant radially, and the injection pipeline is directly or indirectly connected to the second pipeline through the notch.

18. The blood pumping device according to claim 16, characterized in that, The radial dimension of the second pipe is equal to the radial dimension of the flow channel; The outer peripheral surface of the fourth occupant is connected to the first inner peripheral surface of the first bearing located in the proximal receiving cavity, and the included angle between the outer peripheral surface of the fourth occupant and the first inner peripheral surface of the first bearing located in the proximal receiving cavity is equal to 180°. The inner peripheral surface of the fifth occupant is connected to the first outer peripheral surface of the first bearing located in the proximal receiving cavity, and the included angle between the inner peripheral surface of the fifth occupant and the first outer peripheral surface of the first bearing located in the proximal receiving cavity is equal to 180°.

19. The blood pumping device according to claim 16, characterized in that, The sheath body is further provided with a third transition cavity located between the power cavity and the second transition cavity; The blood pumping device also includes a first plug located within the third transition chamber.

20. The blood pumping device according to claim 12, characterized in that, The sheath body is also provided with a return pipe that communicates with the receiving cavity. The injection fluid of the injection pipe flows through the first bearing and the first pipe and then flows to the return pipe. At least part of the return pipe is composed of the cavity after the transmission assembly is removed from the extension cavity.

21. The blood pumping device according to claim 20, characterized in that, The sheath body is further provided with a fourth transition cavity and a fifth transition cavity. The outer peripheral surface of the sheath body is also provided with a first outlet communicating 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 connects the middle section of the extension cavity and the fourth transition cavity. The perfusion fluid 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 includes a second plug located at the end of the fourth transition cavity opposite to the first outlet, and at least part of the return pipe route is composed of the cavity after the second plug is removed from the fourth transition cavity.

22. The blood pumping device according to claim 8, characterized in that, The receiving cavity further includes a sixth transition cavity, which is connected to the bearing receiving cavity, and the radial dimension of the sixth transition cavity is smaller than the radial dimension of the bearing receiving cavity that is directly connected to it; The occupant assembly further includes an eighth occupant and a ninth occupant located in the sixth transition cavity. The eighth occupant is sleeved outside the transmission assembly, and the ninth occupant is sleeved outside the eighth occupant. The eighth occupant has a second surface facing away from the transmission assembly, and the ninth occupant has 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, both gradually decrease in the direction away from the receiving cavity. The gap between the second surface and the third surface forms a third conduit communicating with the flow channel.

23. The blood pumping device according to claim 22, characterized in that, The radial distance between the second surface and the third surface of the intervention sheath is equal to the radial dimension of the flow channel; The second surface is connected to the first inner circumferential surface and the angle between the second surface and the first inner circumferential surface is greater than 90° and less than 180°; the third surface is connected to the first outer circumferential surface and the angle between the third surface and the first outer circumferential surface is greater than 90° and less than 180°.

24. An interventional sheath, characterized in that, include: The sheath body has a connected receiving cavity and an infusion pipeline inside; The transmission assembly is at least partially located within the receiving cavity; A first bearing is located inside the receiving cavity and connected to the sheath body. The first bearing is sleeved outside the transmission assembly, and a flow channel for the flow of perfusion fluid is provided inside the first bearing. The occupant assembly includes at least one occupant located within the receiving cavity, wherein a flow passage is formed within the occupant or between the occupant and at least one of the sheath body, the transmission assembly, and the first bearing, and the flow passage is in communication with the infusion line and the flow channel; The unilateral offset dimension of the flow conduit relative to the flow channel is less than or equal to the radial dimension of the flow channel.

25. A blood pumping device, characterized in that, The interventional sheath includes an interventional sheath and an outflow channel located at the distal end of the interventional sheath, the interventional sheath comprising: The sheath body has a connected receiving cavity and an infusion pipeline inside; The transmission assembly is at least partially located within the receiving cavity; A first bearing is located inside the receiving cavity and connected to the sheath body. The first bearing is sleeved outside the transmission assembly, and a flow channel for the flow of perfusion fluid is provided inside the first bearing. The occupant assembly includes at least one occupant located within the receiving cavity, wherein a flow passage is formed within the occupant or between the occupant and at least one of the sheath body, the transmission assembly, and the first bearing, the flow passage being in communication with the infusion passage and the flow channel, and the angle between the extension direction of the flow passage and the extension direction of the flow channel being greater than 90° and less than or equal to 180°.

26. An interventional sheath, characterized in that, include: The sheath body has a connected receiving cavity and an infusion pipeline inside; The transmission assembly is at least partially located within the receiving cavity; A first bearing is located inside the receiving cavity and connected to the sheath body. The first bearing is sleeved outside the transmission assembly, and a flow channel for the flow of perfusion fluid is provided inside the first bearing. The occupant assembly includes at least one occupant located within the receiving cavity, wherein a flow passage is formed within the occupant or between the occupant and at least one of the sheath body, the transmission assembly, and the first bearing, the flow passage being in communication with the infusion passage and the flow channel, and the angle between the extension direction of the flow passage and the extension direction of the flow channel being greater than 90° and less than or equal to 180°.

Images