Infusion pump assembly and intrusive pump flow guide pipe

Abstract

The utility model provides an infusion pump assembly and an intrusive pump flow catheter, an infusion pump comprises an impeller, a supporting tube body and a transmission mechanism, a liquid drainage flow channel is arranged in the supporting tube body, and the liquid drainage flow channel extends from the far end part of the supporting tube body to the near end part of the supporting tube body; the impeller is arranged outside the far end of the supporting tube body; the transmission mechanism comprises a transmission shaft and a bearing, the bearing is located in the supporting pipe body, the transmission shaft is in transmission connection with the impeller, and the transmission shaft is rotatably arranged in the supporting pipe body through the bearing; the bearing is located on the path of the liquid discharging flow channel and provided with a through hole or a through groove penetrating in the axial direction, and the through hole or the through groove is communicated with the liquid discharging flow channel. Due to the fact that the bearing is located on the path of the liquid discharging flow channel and the bearing is provided with the through hole or the through groove which is through in the axial direction and communicated with the liquid discharging flow channel, perfusate can penetrate through the bearing through the through hole or the through groove when being discharged along the liquid discharging flow channel, the area of an overflowing section when the perfusate flows through the bearing is increased, and resistance borne when the perfusate is discharged is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a liquid pumping assembly and an interventional pump flow catheter. BACKGROUND

[0002] In recent years, the incidence of cardiovascular diseases is increasing, and for some patients with heart failure and other heart diseases, the cardiac output of the heart is difficult to meet the needs of the body, which brings great threat to the health of the body.

[0003] At present, the interventional pump flow catheter has become an important auxiliary device for patients with heart diseases in the treatment process as a way to improve the cardiac output of the heart. The liquid pumping assembly in the interventional pump flow catheter can accelerate the blood flow in the heart by rotating to achieve auxiliary delivery of blood. Since the liquid pumping assembly pumps blood by rotating, there must be a gap between the rotating parts of the liquid pumping assembly. If no measures are taken, the flowing blood will enter the aforementioned gap. Generally, the flowing liquid (perfusate) is used to prevent blood from entering the liquid pumping assembly, and the perfusate can also prevent the particles generated by the friction between the stator and the rotor from entering the human body. Part of the perfusate entering the liquid pumping assembly enters the human body, and the other part is discharged from the liquid discharge flow passage of the perfusion flow passage and carries away the particles and heat. However, the resistance of the perfusate in the current discharge process is large, and more perfusate enters the human body, which is poor in lubrication of the liquid pumping assembly and in carrying away of the particles and heat. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a liquid pumping assembly and an interventional pump flow catheter. The liquid pumping assembly has smaller resistance to the discharge of the perfusate, which is beneficial to better discharge of the perfusate.

[0005] In a first aspect, the present application provides a liquid pumping assembly, which comprises a support pipe body, an impeller and a transmission mechanism. The support pipe body is provided with a liquid discharge flow passage, and the liquid discharge flow passage extends from a distal end portion of the support pipe body to a proximal end portion of the support pipe body. The impeller is arranged outside the distal end of the support pipe body. The transmission mechanism comprises a transmission shaft and a bearing. The bearing is located in the support pipe body, the transmission shaft passes through the support pipe body in the axial direction and protrudes out of the support pipe body at the distal end, the transmission shaft is in transmission connection with the impeller, and the transmission shaft is rotatably arranged in the support pipe body through the bearing. The bearing is located on the path of the liquid discharge flow passage, the bearing is provided with a through hole or a through groove penetrating in the axial direction, and the through hole or the through groove is in communication with the liquid discharge flow passage.

[0006] According to the liquid pumping assembly provided by some embodiments of the present application, the bearing is provided with a shaft hole, the transmission shaft passes through the shaft hole, the wall surface of the shaft hole is recessed outward in the radial direction to form a first groove, the first groove penetrates the bearing in the axial direction, and the first groove is configured as a through groove.

[0007] According to some embodiments of the present application, the pump assembly has a bearing with a first connecting hole in the radial direction, which connects the first groove and the outer peripheral surface of the bearing.

[0008] According to some embodiments of the present application, the pump assembly is further provided with an infusion channel and an adapter within the support tube; the infusion channel and the first connecting hole are connected at the adapter.

[0009] According to some embodiments of the present application, the outer peripheral surface of the bearing is recessed radially inward to form a second groove, the second groove passes through the bearing axially, and the second groove is configured as a through groove.

[0010] According to some embodiments of the present application, the pump assembly has a bearing with a shaft hole through which a drive shaft passes, and the bearing has a second connecting hole in the radial direction, which connects the second groove and the shaft hole.

[0011] According to some embodiments of the present application, the pump assembly includes an inner ring and an outer ring. The outer ring is fitted onto the inner ring, and the inner ring has a shaft hole through which a drive shaft passes. The outer ring is disposed on a support tube, and the inner ring and the outer ring can rotate relative to each other. A third groove is formed by a radial inward recess on the outer circumferential surface of the inner ring. The third groove passes through the bearing axially and is configured as a through hole. And / or, a fourth groove is formed by a recess on the inner circumferential surface of the outer ring. The fourth groove passes through the bearing axially and is configured as a through hole.

[0012] According to some embodiments of this application, the pump assembly has at least two through holes, which are equally spaced around the central axis of the bearing.

[0013] According to some embodiments of the present application, the pump assembly provided in the support tube body is further provided with an infusion channel and a diversion port; the infusion channel extends from the proximal part of the support tube body to the distal part, and the infusion channel and the drainage channel are connected at the diversion port; the diversion port is located in the distal part, and the diversion port can simultaneously connect the infusion channel, the drainage channel and the outside of the support tube body.

[0014] Secondly, some embodiments of this application also provide an interventional pump flow conduit, which includes a pump as described in any of the foregoing technical solutions.

[0015] The technical solutions provided by the embodiments of this disclosure bring at least the following beneficial effects:

[0016] This application provides a liquid pump assembly, which includes a support tube, an impeller, and a transmission mechanism. The support tube contains a drainage channel extending from its distal end to its proximal end. The impeller is located outside the distal end of the support tube. The transmission mechanism includes a drive shaft and a bearing. The bearing is located within the support tube, and the drive shaft axially passes through the support tube and exits at its distal end. The drive shaft is connected to the impeller and is rotatably mounted within the support tube via the bearing. The bearing is located along the path of the drainage channel and has an axially penetrating through-hole or through-slot communicating with the drainage channel. In this structure, because the bearing is located along the path of the drainage channel and has an axially penetrating through-hole or through-slot communicating with the drainage channel, the injection fluid can pass through the through-hole or through-slot through the bearing when discharged along the drainage channel. Compared to designs without through holes or grooves in the bearing, this design allows the injection fluid to flow from one end of the bearing to the other through the through holes or grooves as it flows along the drainage channel. This increases the cross-sectional area of ​​the injection fluid as it flows through the bearing and reduces the resistance encountered when the injection fluid is discharged.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A cross-sectional view of a pump assembly provided in some embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the bearing structure in the pump assembly provided in the first embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the bearing structure in the pump assembly provided in the second embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the bearing structure in the pump assembly provided in the third embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the bearing structure in the pump assembly provided in the fourth embodiment of this application;

[0024] Figure 6 This is a left view of the bearing in the pump assembly provided in the fifth embodiment of this application.

[0025] In the diagram: 1. Impeller; 2. Support tube; 21. Cavity; 22. Injection channel; 221. Diverter port; 23. Drainage channel; 24. Inlet port; 25. Drainage port; 26. Inlet through hole; 261. First interface; 262. Second interface; 27. Drainage through hole; 271. Third interface; 272. Fourth interface; 3. Drive shaft; 4. Bearing; 40. Through hole; 401. Through groove; 41. Shaft hole; 42. First groove; 43. Second groove; 44. First connecting hole; 45. Second connecting hole; 46. Inner ring; 461. Third groove; 47. Outer ring; 471. Fourth groove. Detailed Implementation

[0026] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0027] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0028] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0029] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] An interventional pump flow catheter is a catheter equipped with a fluid aspiration pump that can be inserted into the human body. It can be used to treat diseases of the vascular system or non-vascular system. For example, an interventional pump flow catheter can be inserted into the human vascular system as a component of a blood pumping device to assist in the delivery of blood; that is, an interventional pump flow catheter is a blood pumping catheter. It can also be used to aspirate and filter thrombi in the blood, facilitating the removal of thrombi from the body; that is, an interventional pump flow catheter is a thrombus aspiration catheter.

[0033] It is understood that the interventional pumping catheter in this application can also be used in applications such as tissue fluid pumping devices and digestive fluid pumping devices to achieve the purpose of pumping tissue fluid, digestive fluid and other fluids. For ease of understanding and description, the following will continue to describe the application scenario of the interventional pumping catheter in a blood pumping device as an example.

[0034] The heart is a vital organ that powers the body's blood circulation. Cardiac output is an important indicator of the strength and normality of the heart's pumping function. When suffering from heart diseases such as heart failure, the heart's output may be insufficient to meet the body's needs, making interventional pump catheters an important treatment option.

[0035] In some applications, the interventional pump catheter serves as a blood-pumping catheter. Passing through the skin, it enters the aortic system via a femoral artery puncture. It then crosses the aortic arch and aortic valve to reach the left ventricle, creating a blood flow channel between the left ventricle and the aorta. The channel's entrance is in the left ventricle, and its exit is within the aorta. The pump catheter, through a transmission system and the high-speed rotation of an impeller, pumps blood from the left ventricle into the aorta, from where it flows to all tissues and organs throughout the body. This provides auxiliary circulatory support, reduces the burden on the heart and oxygen consumption, and aids in the recovery of cardiac function.

[0036] In interventional pump-flow conduits, the support tube of the pump assembly typically contains an infusion channel. This channel delivers infusion fluid (glucose solution) to the pump. The infusion fluid is injected from the proximal end of the support tube and flows along the infusion channel to the distal end. At the distal end, the infusion fluid splits into two parts. One part is discharged through a drainage channel, lubricating and cooling the components inside the support tube and removing friction particles from the friction pairs along its path. The other part enters the bloodstream at the distal end of the support tube. Note that, generally, "distal" refers to the end of the support tube furthest from the operator during operation, while "proximal" refers to the end closest to the operator.

[0037] In interventional pump flow conduits, for example, the gap (i.e., friction pair) between the shaft and bearing in the support tube forms part of the drainage channel. The infusion fluid in the drainage channel passes through this gap and other parts of the drainage channel to reach the drainage port of the support tube and is discharged. Because this gap is small, the tube resistance on the drainage path is large, and the drainage process experiences greater resistance. This not only causes more infusion fluid to enter the body, but also makes the drainage less effective in lubricating the pump and removing particles and heat.

[0038] To reduce the resistance encountered by the injection fluid during the discharge process in this pump assembly and to enable better discharge of the injection fluid, this application provides a pump assembly comprising a support tube, an impeller, and a transmission mechanism. The support tube contains a discharge channel extending from its distal end to its proximal end. The impeller is disposed outside the distal end of the support tube. The transmission mechanism includes a drive shaft and a bearing. The bearing is located within the support tube, and the drive shaft passes axially through the support tube and exits at its distal end. The drive shaft is rotatably connected to the impeller via the bearing. The bearing is located along the path of the discharge channel and has an axially penetrating through-hole or through-slot communicating with the discharge channel. In this structure, because the bearing is located along the path of the discharge channel and has an axially penetrating through-hole or through-slot communicating with the discharge channel, the injection fluid can pass through the through-hole or through-slot through the bearing when discharged along the discharge channel. Compared to designs without through holes or grooves in the bearing, this design allows the injection fluid to flow from one end of the bearing to the other through the through holes or grooves as it flows along the drainage channel. This increases the cross-sectional area of ​​the injection fluid as it flows through the bearing and reduces the resistance encountered when the injection fluid is discharged.

[0039] The technical solution of the liquid pump assembly and the interventional pump flow conduit provided in this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] This application provides a liquid pump assembly, such as... Figure 1 As shown, the pump assembly includes a support tube 2, an impeller 1, and a transmission mechanism. The support tube 2 has a drainage channel 23 extending from the distal end to the proximal end of the support tube 2. The impeller 1 is located outside the distal end of the support tube 2. The transmission mechanism includes a drive shaft 3 and a bearing 4. The bearing 4 is located in the support tube 2. The drive shaft 3 passes through the support tube 2 axially and exits the support tube 2 at its distal end. The drive shaft 3 is connected to the impeller 1. The drive shaft 3 is rotatably mounted in the support tube 2 via the bearing 4. The bearing 4 is located on the path of the drainage channel 23. The bearing 4 has an axially penetrating through hole 40 or through groove 401, which communicates with the drainage channel 23.

[0041] Impeller 1 can be a component in the pump assembly used to apply force to the blood and achieve blood delivery. By placing impeller 1 on the distal exterior of the support tube 2, not only can impeller 1 be better inserted into the human body, but it also helps to reduce the influence of components located near the proximal end of the support tube 2 on impeller 1.

[0042] The support tube 2 can be a support structure in the pump assembly, which forms a cavity 21 in the pump assembly so that components such as the drive shaft 3 and bearing 4 can be protected or supported by the support tube 2 within the cavity 21. The cavity 21, as a cavity enclosed by the support tube 2, is used to accommodate components such as the bearing 4 and drive shaft 3.

[0043] The drainage channel 23 can be a flow channel structure provided in the support tube 2. By extending the drainage channel 23 from the distal end of the support tube 2 to the proximal end of the support tube 2, the drainage channel 23 can communicate with the drainage pipeline connected to the proximal end, and is used to introduce the injection fluid inside the pump assembly into the drainage pipeline, thereby smoothly discharging it. For example, the support tube 2 can also be provided with an injection channel 22, which can be a flow channel structure provided in the support tube 2, and is used to introduce the injection fluid delivered from the injection pipeline into the pump assembly. The provision of the injection channel 22 and the drainage channel 23 in the support tube 2 allows the injection fluid to smoothly enter the pump assembly and lubricate the bearings 4, drive shaft 3, and other components inside the support tube 2, and to remove particles and heat generated by these components.

[0044] For example, the infusion channel 22 can be an interface that connects to the cavity 21 through the inlet 24, so that the infusion fluid in the infusion channel 22 can smoothly enter the cavity 21; the drainage channel 23 can be an interface that connects to the cavity 21 through the drainage outlet 25, so that the infusion fluid in the cavity 21 can smoothly enter the infusion channel 22.

[0045] The drive shaft 3 in the transmission mechanism can be a shaft component used to transmit power to the impeller 1 to drive the impeller 1 to rotate. The drive shaft 3 passes axially through the support tube 2 and exits from the support tube 2 at its distal end, allowing the drive shaft 3 to connect with the impeller 1 located outside the distal end of the support tube 2. The bearing 4, as a component in the transmission mechanism used to ensure smooth and stable rotation of the drive shaft 3, is disposed in the cavity 21. The drive shaft 3 is rotatably disposed in the support tube 2 via the bearing 4, so that the drive shaft 3 can be well and stably supported and can rotate smoothly relative to the support tube 2. The drive shaft 3 passing through the cavity 21 and being connected to the impeller 1 can mean that the drive shaft 3 enters from one side of the support tube 2, passes through the cavity 21 and exits from the other side, and the drive shaft 3 extending from the support tube 2 is connected to the impeller 1, so that the drive shaft 3 can transmit power to the impeller 1, driving the impeller 1 to rotate relative to the support tube 2.

[0046] The bearing 4 is located on the path of the drain channel 23. Specifically, it can be positioned axially on the drive shaft 3, between the inlet 24 and the outlet 25, with the inlet 24 and outlet 25 spaced apart along the axial direction of the drive shaft 3. Alternatively, the inlet 24 and outlet 25 can be located on the central axis of the drive shaft 3, with the bearing 4 on the central axis positioned between them. Or, the inlet 24 and outlet 25 can be located not on the central axis of the drive shaft 3, but spaced apart axially, with the bearing 4 on the central axis positioned within this space.

[0047] The through-hole 40 can be a hole-like structure provided on the bearing 4, which axially penetrates the two opposite end faces of the bearing 4, allowing the injection fluid to flow smoothly axially between the two sides of the bearing 4 through the through-hole 40. The through groove 401 can be a groove provided on the outer surface of the bearing 4, which axially penetrates the two opposite end faces of the bearing 4, allowing the injection fluid to flow smoothly axially between the two sides of the bearing 4 through the through groove 401. By connecting the through-hole 40 or the through groove 401 to the drainage channel 23, the through-hole 40 or the through groove 401 can be located on the drainage path of the drainage channel 23.

[0048] In the above structure, since the bearing 4 is located on the path of the drain channel 23, and the bearing 4 is provided with a through hole 40 or a through groove 401 that runs axially through and communicates with the drain channel 23, the injection fluid can pass through the through hole 40 or the through groove 401 when it is discharged along the drain channel 23. Compared with the scheme in which no through hole 40 or through groove 401 is provided in the bearing 4, this scheme allows the injection fluid to flow from one end of the bearing 4 to the other end through the through hole 40 or the through groove 401 when it flows along the drain channel 23, increasing the cross-sectional area of ​​the flow of the injection fluid through the bearing 4 and reducing the resistance encountered by the injection fluid when it is discharged.

[0049] In some embodiments, reference Figure 2 The bearing 4 is provided with a shaft hole 41, the drive shaft 3 passes through the shaft hole 41, and the wall of the shaft hole 41 is recessed radially outward to form a first groove 42. The first groove 42 passes through the bearing 4 axially and is configured as a through groove 401.

[0050] The shaft hole 41 can be a hole-like structure in the bearing 4 for the transmission shaft 3 to pass through. The transmission shaft 3 passes through the shaft hole 41 of the bearing 4, so that the transmission shaft 3 can be stably supported by the bearing 4 and can rotate stably relative to the support tube 2.

[0051] The first groove 42 can be a groove structure formed by radially outward recessing of the wall surface of the shaft hole 41. The first groove 42 passes through the bearing 4 axially, which means that the first groove 42 passes through the two opposite end faces of the bearing 4 axially, so that the first groove 42 connects the two opposite end faces of the bearing 4 axially.

[0052] By configuring the first groove 42 as a through groove 401, the through groove 401 not only connects the two axially opposite end faces of the bearing 4, allowing the injection fluid to flow smoothly between the two sides of the bearing 4 along the axial direction through the through groove 401, but also allows the injection fluid in the through groove 401 to contact the drive shaft 3 in the shaft hole 41 and better penetrate into the gap between the outer surface of the drive shaft 3 and the inner wall surface of the shaft hole 41, so that the injection fluid can better lubricate the contact surface between the drive shaft 3 and the bearing 4, and remove the particles and heat generated on the contact surface between the drive shaft 3 and the bearing 4.

[0053] In the above embodiment, when the injection fluid is discharged to the outside of the pump assembly, the injection fluid will pass through the bearing 4 along the first groove 42 of the through bearing 4, and then enter the drainage channel 23.

[0054] In some embodiments, reference Figure 3 The bearing 4 is provided with a first connecting hole 44 in the radial direction, which connects the first groove 42 and the outer peripheral surface of the bearing 4.

[0055] The first connecting hole 44 can be a hole-like structure provided in the bearing 4. The first connecting hole 44 connects the first groove 42 and the outer peripheral surface of the bearing 4, so that the injection fluid in the first groove 42 can penetrate along the first connecting hole 44 into the gap between the outer peripheral surface of the bearing 4 and the wall of the support tube 2, so that the injection fluid can better lubricate the contact surface between the bearing 4 and the support tube 2, and remove the particles and heat generated on the contact surface between the bearing 4 and the support tube 2.

[0056] For example, the first connecting hole 44 can extend radially along the bearing 4, so that the path of the injection fluid flowing along the first connecting hole 44 into the gap between the outer peripheral surface of the bearing 4 and the wall surface of the support tube 2 is shorter. This is beneficial to improve the lubrication effect of the injection fluid on the contact surface between the bearing 4 and the support tube 2, as well as the effect of removing particles and heat generated on the contact surface between the bearing 4 and the support tube 2.

[0057] In the above embodiment, when the injection fluid is discharged to the outside of the pump assembly, the injection fluid will be divided into two paths as it passes through the first groove 42 of the bearing 4. One path flows along the first groove 42 to the drainage channel 23; the other path enters the first connecting hole 44 and seeps into the gap between the outer peripheral surface of the bearing 4 and the wall of the support tube 2, and then enters the drainage channel 23.

[0058] In some embodiments, the bearing 4 is configured to be fixed relative to the support tube 2, and the drive shaft 3 is configured to be rotatable relative to the bearing 4.

[0059] By configuring the bearing 4 to be fixed relative to the support tube 2 and the drive shaft 3 to be rotatable relative to the bearing 4, the drive shaft 3 rotates relative to the bearing 4 when driving the impeller 1 to rotate. The outer surface of the drive shaft 3 and the inner wall of the shaft hole 41 form a friction pair. At this time, the first groove 42 formed by the radial inward indentation of the wall of the shaft hole 41 serves as a channel 401 for guiding the injection fluid. The injection fluid guided by the channel 401 can have more contact with the friction pair formed by the outer surface of the drive shaft 3 and the wall of the shaft hole 41. The injection fluid can better lubricate the friction pair and remove particles and heat generated on the friction pair.

[0060] In some embodiments, the support tube 2 is further provided with an injection channel 22 and an adapter; the injection channel 22 and the first connecting hole 44 are connected at the adapter.

[0061] The infusion channel 22 can be a channel structure provided in the support tube 2, which is used to introduce the infusion fluid delivered by the infusion pipeline into the pump assembly. The adapter can be an interface provided in the support tube 2 for connecting the infusion channel 22 with the first connecting hole 44. By using the adapter to connect the infusion channel 22 with the first connecting hole 44, the infusion fluid delivered by the infusion channel 22 can enter the first connecting hole 44 through the adapter and then flow into the first groove 42.

[0062] In the above embodiment, when the injection fluid flows into the pump assembly, it is divided into two paths in the injection channel 22. One path enters the first connecting hole 44 through the adapter, then enters the first groove 42, and finally flows to the drainage channel 23; the other path flows directly into the first groove 42 and flows along the first groove 42 to the drainage channel 23.

[0063] In some embodiments, reference Figure 4 The outer peripheral surface of the bearing 4 is recessed radially inward to form a second groove 43, which passes through the bearing 4 axially and is configured as a through groove 401.

[0064] The second groove 43 can be a groove structure formed by radially inward recessing the outer peripheral surface of the bearing 4. The second groove 43 penetrates the bearing 4 axially, which means that the second groove 43 penetrates the two opposite end faces of the bearing 4 axially, so that the second groove 43 connects the two opposite end faces of the bearing 4 axially.

[0065] By configuring the second groove 43 as a through groove 401, the through groove 401 not only connects the two axially opposite end faces of the bearing 4, allowing the injection fluid to flow smoothly between the two sides of the bearing 4 through the through hole 40, but also allows the injection fluid in the through groove 401 to contact the outer peripheral surface of the bearing 4 and better penetrate into the gap between the outer surface of the bearing 4 and the wall of the support tube 2, so that the injection fluid can better lubricate the contact surface between the bearing 4 and the support tube 2, and remove the particles and heat generated on the contact surface between the bearing 4 and the support tube 2.

[0066] In some embodiments, reference Figure 5 The bearing 4 is provided with a shaft hole 41, through which the drive shaft 3 passes. The bearing 4 is provided with a second connecting hole 45 in the radial direction, which connects the second groove 43 and the shaft hole 41.

[0067] The shaft hole 41 can be a hole-like structure in the bearing 4 for the transmission shaft 3 to pass through. The transmission shaft 3 passes through the shaft hole 41 of the bearing 4, so that the transmission shaft 3 can be stably supported by the bearing 4 and can rotate stably relative to the support tube 2.

[0068] The second connecting hole 45 can be a hole-like structure provided in the bearing 4. The second connecting hole 45 connects the second groove 43 and the shaft hole 41, so that the injection fluid in the second groove 43 can penetrate along the second connecting hole 45 into the gap between the inner wall surface of the shaft hole 41 and the outer peripheral surface of the drive shaft 3. This allows the injection fluid to better lubricate the contact surface between the inner wall surface of the shaft hole 41 and the outer peripheral surface of the drive shaft 3, and to remove particles and heat generated on the contact surface between the drive shaft 3 and the bearing 4.

[0069] For example, the second connecting hole 45 can extend radially along the bearing 4, so that the path of the injection fluid flowing along the second connecting hole 45 into the gap between the inner wall surface of the shaft hole 41 and the outer peripheral surface of the drive shaft 3 is shorter. This is beneficial to improving the lubrication effect of the injection fluid on the contact surface between the drive shaft 3 and the bearing 4, as well as the effect of removing particles and heat generated on the contact surface between the drive shaft 3 and the bearing 4.

[0070] In the above embodiment, when the injection fluid is discharged to the outside of the pump assembly, the injection fluid will be divided into two paths as it passes through the bearing 4 along the second groove 43 of the through bearing 4. One path flows along the second groove 43 to the drainage channel 23; the other path enters the second connecting hole 45 and seeps into the gap between the inner wall of the shaft hole 41 and the outer peripheral surface of the drive shaft 3, and then enters the drainage channel 23.

[0071] In some embodiments, while a second groove 43 is formed on the outer peripheral surface of the bearing 4 that passes through the bearing 4 axially, a first groove 42 is formed on the inner wall surface of the shaft hole 41 that passes through the bearing 4 axially, and a second connecting hole 45 connects the first groove 42 and the second groove 43.

[0072] In some embodiments, the bearing 4 is configured to rotate relative to the support tube 2, and the drive shaft 3 is configured to be fixed relative to the bearing 4.

[0073] By configuring the bearing 4 to rotate relative to the support tube 2 and configuring the drive shaft 3 to be fixed relative to the bearing 4, when the drive shaft 3 drives the impeller 1 to rotate, the drive shaft 3 drives the bearing 4 to rotate synchronously. The bearing 4 rotates relative to the support tube 2, and the outer peripheral surface of the bearing 4 forms a friction pair with the wall surface of the support tube 2. At this time, the second groove 43 formed by the inward indentation of the outer peripheral surface of the bearing 4 serves as a through hole 40 for guiding the injection fluid. The injection fluid guided by the through hole 40 can have more contact with the friction pair formed by the outer peripheral surface of the bearing 4 and the wall surface of the support tube 2. The injection fluid can better lubricate the friction pair and remove the particles and heat generated on the friction pair.

[0074] In some embodiments, reference Figure 6 The bearing 4 includes an inner ring 46 and an outer ring 47. The outer ring 47 is fitted onto the inner ring 46. The inner ring 46 has a shaft hole 41 through which the drive shaft 3 passes. The outer ring 47 is mounted on the support tube 2. The inner ring 46 and the outer ring 47 can rotate relative to each other. The outer circumferential surface of the inner ring 46 is recessed radially inward to form a third groove 461. The third groove 461 passes through the bearing 4 axially and is configured as a through hole 40. And / or, the inner circumferential surface of the outer ring 47 is recessed to form a fourth groove 471. The fourth groove 471 passes through the bearing 4 axially and is configured as a through hole 40.

[0075] Inner ring 46 and outer ring 47 are two coaxially arranged annular structures in bearing 4. Outer ring 47 is fitted outside inner ring 46 and can rotate relative to inner ring 46. Outer ring 47 is disposed in support tube 2. Shaft hole 41 can be a hole-like structure in inner ring 46 for the transmission shaft 3 to pass through. The transmission shaft 3 passes through shaft hole 41 of inner ring 46, so that the transmission shaft 3 can be stably supported by bearing 4 and can rotate stably relative to support tube 2.

[0076] Alternatively, the outer circumferential surface of the inner ring 46 may be recessed inward to form the third groove 461, without the inner circumferential surface of the outer ring 47 being recessed inward. By forming the third groove 461 by recessing the outer circumferential surface of the inner ring 46 inward, and making the third groove 461 axially penetrating the bearing 4, the third groove 461 is configured as a through hole 40. This allows the through hole 40 to not only connect the two axially opposite end faces of the bearing 4, allowing the injection fluid to flow smoothly between the two sides of the bearing 4 axially through the through hole 40, but also allows the injection fluid in the through hole 40 to contact the outer circumferential surface of the inner ring 46 and better penetrate into the gap between the outer circumferential surface of the inner ring 46 and the inner circumferential surface of the outer ring 47. This allows the injection fluid to better lubricate the contact surface between the inner ring 46 and the outer ring 47, carrying away particles and heat generated on the contact surface between the inner ring 46 and the outer ring 47.

[0077] Alternatively, the fourth groove 471 can be formed by recessing the inner circumference of the outer ring 47 inward, without recessing the outer circumference of the inner ring 46 inward. By forming the fourth groove 471 by recessing the inner circumference of the outer ring 47 inward, and extending the fourth groove 471 axially through the bearing 4, the fourth groove 471 is configured as a through hole 40. This allows the through hole 40 to not only connect the two axially opposite end faces of the bearing 4, enabling the injection fluid to flow smoothly between the two sides of the bearing 4 axially, but also allows the injection fluid in the through hole 40 to contact the inner circumference of the outer ring 47 and better penetrate into the gap between the outer circumference of the inner ring 46 and the inner circumference of the outer ring 47. This allows the injection fluid to better lubricate the contact surface between the inner ring 46 and the outer ring 47, carrying away particles and heat generated on the contact surface between the inner ring 46 and the outer ring 47.

[0078] Alternatively, the outer circumference of the inner ring 46 may be recessed inward to form a third groove 461, and the inner circumference of the outer ring 47 may be recessed inward to form a fourth groove 471. Both the third groove 461 and the fourth groove 471 serve as through holes 40, allowing the through holes 40 to guide more injection fluid to penetrate into the gap between the outer circumference of the inner ring 46 and the inner circumference of the outer ring 47. This allows the injection fluid to better lubricate the contact surface between the inner ring 46 and the outer ring 47, and to remove particles and heat generated on the contact surface between the inner ring 46 and the outer ring 47.

[0079] In some embodiments, at least two through holes 40 are provided, and the at least two through holes 40 are equally spaced around the central axis of the bearing 4.

[0080] By providing at least two through holes 40, the at least two through holes 40 can provide a larger flow area for the injection fluid flowing between the two sides of the bearing 4. The injection fluid in the cavity 21 can pass more smoothly through the drain port 25 into the drain channel 23 through the at least two through holes 40 on the bearing 4, thereby realizing the discharge of the injection fluid. This is beneficial to further reduce the resistance encountered by the injection fluid in the discharge process of the pump assembly.

[0081] At least two through holes 40 are equally spaced around the central axis of the bearing 4. Alternatively, at least two through holes 40 may be equally spaced on a circle centered on the central axis of the bearing 4, so that the injection fluid can flow evenly between the two sides of the bearing 4.

[0082] In some embodiments, the support tube body is further provided with an infusion channel 22 and a diversion port 221; the infusion channel 22 extends from the proximal portion of the support tube body 2 to the distal portion, and the infusion channel 22 and the drainage channel 23 are connected at the diversion port 221; the diversion port 221 is located at the distal portion, and the diversion port 221 can simultaneously connect the infusion channel 22, the drainage channel 23 and the outside of the support tube body 2.

[0083] The infusion channel 22 can be a channel structure provided in the support pipe 2, which is used to introduce the infusion fluid delivered by the infusion pipeline into the pump assembly.

[0084] The diversion port 221 can be an interface for allowing the perfusion fluid delivered from the perfusion channel 22 to flow to the drain channel 23 and the outside of the support tube 2 respectively. This allows the perfusion fluid to flow to the drain channel 23 in one direction so as to be discharged outside the pump assembly, and to flow to the outside of the support tube 2 in another direction so as to flow into the human blood.

[0085] By extending the infusion channel 22 from the proximal part to the distal part of the support tube 2, and setting the diversion port 221 at the distal part of the support tube 2, the infusion channel 22 and the drainage channel 23 are connected at the distal part of the support tube 2.

[0086] For example, continue to refer to Figure 1The support tube 2 is also provided with an inlet port 26 and a outlet port 27, both of which extend axially. The inlet port 26 is connected to the cavity 21 through a first interface 261 and to the outside through a second interface 262. The drive shaft 3 extends into the inlet port 26 from the first interface 261 and extends out of the inlet port 26 from the second interface 262. The drive shaft 3 outside the second interface 262 is connected to the impeller 1. A liquid inlet gap is formed between the drive shaft 3 and the inner wall of the inlet port 26. The injection channel 22 is connected to the inlet gap through the branch port 221; the drain hole 27 is connected to the cavity 21 through the third interface 271 and to the outside through the fourth interface 272; the drive shaft 3 extends into the drain hole 27 from the third interface 271 and extends out of the drain hole 27 from the fourth interface 272; the drive shaft 3 and the inner wall of the drain hole 27 form a drain gap, which is configured as a drain channel 23, the third interface 271 is configured as a drain port 25, and the first interface 261 is configured as an inlet port 24.

[0087] The inlet port 26 can be a perforated structure provided on the support tube 2, which is used to allow the perfusion fluid to enter the human blood from the pump assembly. The first interface 261 is the interface of the inlet port 26 for connecting with the cavity 21, and the second interface 262 is the interface of the inlet port 26 for communicating with the outside. By extending the inlet port 26 axially, the drive shaft 3 can pass through the inlet port 26. The drive shaft 3 extends from the cavity 21 into the outside along the inlet port 26 by extending into the inlet port 26 from the first interface 261 and extending out of the inlet port 26 from the second interface 262, and is connected to the impeller 1 located outside the support tube 2. Under the drive of the drive shaft 3, the impeller 1 located outside the support tube 2 can act on the blood (human blood) outside the support tube 2 and transport it.

[0088] The inlet gap can be the part of the inlet orifice 26 used to allow the perfusion fluid to enter the blood of the human body from the pump assembly. It is the gap between the outer peripheral surface of the drive shaft 3 and the inner wall surface of the inlet orifice 26. The perfusion fluid can flow to the outside of the support tube 2 through the inlet gap.

[0089] The injection channel 22 is connected to the inlet gap through the diversion port 221. This means that the diversion port 221 serves as the interface connecting the injection channel 22 and the inlet gap, allowing the injection fluid from the injection channel 22 to flow through the diversion port 221 into the inlet gap, so that the injection fluid can then flow into the cavity 21 or the outside of the support tube 2.

[0090] The drainage through-hole 27 can be a perforated structure provided on the support tube 2, which is used to discharge the injection fluid from the pump assembly and flow into the drainage pipeline. The third interface 271 is the interface of the drainage through-hole 27 for connecting with the cavity 21, and the fourth interface 272 is the interface of the drainage through-hole 27 for communicating with the external drainage pipeline. By extending the drainage through-hole 27 axially, the drive shaft 3 can pass through the drainage through-hole 27. The drive shaft 3 extends from the cavity 21 to the outside along the drainage through-hole 27 by extending into the drainage through-hole 27 from the third interface 271 and extending out of the drainage through-hole 27 from the fourth interface 272, so that external power can be transmitted to the pump assembly through the drive shaft 3.

[0091] The drainage gap can be the part of the drainage through hole 27 used to discharge the injection fluid from the pump assembly to the drainage pipeline. It is the gap between the outer peripheral surface of the drive shaft 3 and the inner wall surface of the drainage through hole 27. The injection fluid can flow to the outside of the support tube 2 through the drainage gap.

[0092] The drainage gap is configured as a drainage channel 23, and the third interface 271 is configured as a drainage port 25, so that the injection fluid in the cavity 21 can enter the drainage gap through the third interface 271 and be further discharged from the pump assembly to the drainage pipeline.

[0093] By configuring the first interface 261 as the liquid inlet 24 and the third interface 271 as the liquid outlet 25, the bearing 4 located in the cavity 21 can be positioned axially between the liquid inlet 24 and the liquid outlet 25.

[0094] In some embodiments, the shunt port 221 is located between the first interface 261 and the second interface 262.

[0095] By setting the diversion port 221 between the first interface 261 and the second interface 262, the perfusion fluid flowing into the inlet gap from the perfusion channel 22 is partially diverted between the first interface 261 and the second interface 262. Part of the fluid flows to the outside of the support tube 2 through the first interface 261, and the other part flows to the cavity 21 through the second interface 262. The diversion of the perfusion fluid in the middle of the inlet gap (at the diversion port 221) can reduce the possibility of mixing between the perfusion fluid flowing to the cavity 21 and the perfusion fluid flowing to the human blood.

[0096] For example, the support tube 2 includes a bearing housing and a body that are interconnected, and the bearing 4 is connected to the bearing housing.

[0097] The main body can be the main structure in the support tube 2, and the bearing housing can be the housing structure in the support tube 2 used to install the bearing 4, which can provide stable support for the bearing 4. By connecting the bearing 4 to the bearing housing, the bearing 4 can be stably connected to the support tube 2.

[0098] In some embodiments, the bearing housing and the main body can be an integrally molded structure made using processes such as injection molding or casting.

[0099] Some embodiments of this application also provide an interventional pump flow conduit, which includes an infusion line, a drainage line, and a pump assembly as described in the foregoing technical solutions. The infusion line is connected to the infusion channel 22 in the pump assembly, and the drainage line is connected to the drainage channel 23 in the pump assembly.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A liquid extraction pump assembly, characterized by, The application relates to a liquid pumping assembly. The application relates to a liquid pumping assembly. The application relates to a liquid pumping assembly. The application relates to a liquid pumping assembly.

2. The liquid suction pump assembly of claim 1, wherein, The application relates to a liquid pumping assembly.

3. The liquid suction pump assembly of claim 2, wherein, The application relates to a liquid pumping assembly.

4. The liquid suction pump assembly of claim 3, wherein, The application relates to a liquid pumping assembly.

5. The liquid suction pump assembly according to any one of claims 1-4, characterized in that, The application relates to a liquid pumping assembly.

6. The liquid suction pump assembly of claim 5, wherein, The application relates to a liquid pumping assembly.

7. The liquid suction pump assembly of claim 1, wherein, The application relates to a liquid pumping assembly.

8. The liquid suction pump assembly of claim 1, wherein, The application relates to a liquid pumping assembly.

9. The liquid suction pump assembly of claim 1, wherein, The application relates to a liquid pumping assembly.

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