A fluid perfusion device

Abstract

The present invention provides a fluid perfusion device, comprising a main body and a rotating unit disposed through the main body, wherein a first fluid passage and a second fluid passage are disposed within the main body; a first perfusion fluid flows through the first fluid passage and is discharged into a target environment at the distal end of the rotating unit; a second perfusion fluid enters the main body along the inlet of the second fluid passage and leaves the main body along the outlet of the second fluid passage; the outlet of the second fluid passage is disposed adjacent to the inlet of the second fluid passage. The present invention constructs two fluid passages and employs two perfusion fluids. The first perfusion fluid is discharged into the target environment, and the second perfusion fluid can remove heat generated by the friction pair of the main body as it passes through the main body, thereby avoiding the precipitation of physiological saline or glucose and damage to the transmission system. The second perfusion fluid can effectively flush the friction pair and prevent wear particles from entering the human body.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a fluid perfusion device. Background Art

[0002] In the field of medical devices, a method of filling with flowing perfusion fluid is often used to prevent blood from entering the transmission system of a blood pumping device. In a blood pumping device, wear particles are generated in the transmission device, such as the flexible transmission element, as well as the impeller shaft and the bearings. When the wear particles enter the human body along with the perfusion fluid, they will form blood clots, endangering human life and health. In addition, the perfusion fluid used in the prior art is a glucose solution or physiological saline solution. When the blood pumping device is running, the bearings, flexible transmission elements, etc. are in direct contact with the perfusion fluid. The heat generated by their high-speed rotation will cause the glucose or NaCl in the perfusion fluid to precipitate and adhere to the surfaces of the bearings, flexible transmission elements and other components, resulting in a reduction in the operating life of the bearings, flexible transmission elements, etc., and even the risk of clogging the perfusion system. If a blockage occurs, the risk of failure of the transmission system, such as the bearings and flexible transmission elements, will increase significantly, thereby causing the blood pumping device to fail. Summary of the Invention

[0003] In order to overcome at least one of the problems in the related art, a first aspect of the present invention provides a fluid perfusion device.

[0004] The fluid perfusion device comprises a body and a rotating unit provided through the body.

[0005] Wherein, the body is provided with a first fluid passage and a second fluid passage;

[0006] A preset first perfusion fluid flows through the first fluid passage and is discharged into the target environment at the distal end of the rotating unit;

[0007] The preset second perfusion liquid enters the body along the inlet of the second fluid passage and leaves the body along the outlet of the second fluid passage; the outlet of the second fluid passage is arranged adjacent to the inlet of the second fluid passage.

[0008] In an optional embodiment, the inlet of the first fluid passage is arranged at the proximal end of the body; and / or, the inlet and outlet of the second fluid passage are both arranged at the proximal end of the body.

[0009] In an optional embodiment, the body includes a multi-lumen sheath, a sealing cover and a bearing seat, the multi-lumen sheath is arranged at the proximal end of the body, and the first fluid passage and the second fluid passage respectively pass through the multi-lumen sheath, the sealing cover and the bearing seat in sequence.

[0010] In an optional embodiment, a first gap is included between the bearing seat and the rotating unit, and a portion of the first fluid passage located at the distal end of the bearing seat merges with the first gap at a first confluence portion.

[0011] In an optional embodiment, a second gap is further included between the bearing seat and the rotating unit, and the portion of the second fluid passage located at the distal end of the bearing seat merges with the second gap at a second confluence portion.

[0012] In an optional embodiment, the first confluence portion is closer to the distal end of the rotation unit than the second confluence portion.

[0013] In an optional embodiment, the flow area of ​​the first gap in the radial direction of the body is larger than the flow area of ​​the second gap in the radial direction of the body.

[0014] In an optional embodiment, a bearing is provided between the bearing seat and the rotating unit, and the preset second perfusion fluid flows through the second confluence portion to flush the outer surface of the rotating unit and the friction pair of the bearing.

[0015] In an optional embodiment, the sealing cover includes a separation unit, and the separation unit enables the preset first perfusion liquid and the preset second perfusion liquid entering the bearing seat to remain separated from each other.

[0016] In an optional embodiment, at least two separation units are provided, which protrude radially from the sealing cover and are spaced apart circumferentially from the sealing cover. The separation units cooperate with the multi-lumen sheath and the bearing seat to form at least two flow gaps, wherein part of the flow gaps is used for the circulation of a preset first perfusion liquid, and the remaining part of the flow gaps is used for the circulation of a preset second perfusion liquid.

[0017] In an optional embodiment, the inlet of the first fluid passage and the inlet of the second fluid passage differ in at least one of size, shape or number.

[0018] Another aspect of the present invention provides a blood pumping device, which includes any fluid perfusion device described in the first aspect.

[0019] The technical solution of the present invention has the following advantages or beneficial effects:

[0020] (1) The perfusion device of the present invention has two fluid pathways constructed in the body, so that two perfusion fluids can be used. The first perfusion fluid is discharged into the target environment. Under the continuous perfusion fluid pressure, the fluid in the target environment can be prevented from entering the body. The second perfusion fluid only flows through the body but does not enter the human body. During the passage of the second perfusion fluid, it can take away the heat generated by the friction pair of the body, thereby preventing the temperature of each component in the body from being too high and causing the precipitation of perfusion fluid solutes such as physiological saline or glucose. In other words, the two perfusion fluids of the present invention flow in different channels respectively and perform different functions respectively, thereby avoiding the problem of perfusion fluid solute precipitation and damage to the transmission system in the body caused by the diversion of the first perfusion fluid used in the prior art, as well as the problem of low utilization rate in the prior art where part of the first perfusion fluid cannot be used to mix the fluid in the target environment.

[0021] (2) The first fluid passage and the second fluid passage respectively pass through the multi-lumen sheath, the sealing cover and the bearing seat in sequence, thereby making full use of the space in the body and avoiding the problem of the overall volume of the perfusion device being too large. In addition, the outlet of the first fluid passage merges with the first gap at the first junction. Since the pressure of the first perfusion liquid is greater than the target environment pressure, the first perfusion liquid is continuously discharged into the target environment, thereby effectively utilizing the pressure of the first perfusion liquid to force the fluid of the target environment located at the outlet of the first fluid passage to leave the first gap; thus avoiding the fluid of the target environment from entering the transmission system of the perfusion device, thereby affecting the normal operation of the transmission system, causing problems such as increased load and transmission failure. The part of the second fluid passage inside the bearing seat is set to pass through in the radial direction and intersect with the second gap between the bearing seat and the rotating unit, so that the second perfusion liquid can flow out of the perfusion device along the friction pair such as the rotating shaft after flowing through the bearing seat, thereby achieving the purpose of cooling and flushing the friction pair and avoiding various risks caused by wear particles entering the human body.

[0022] (3) The first confluence of the present invention is closer to the distal end of the rotating unit than the second confluence; this arrangement increases the distance between the first perfusion fluid and the second perfusion fluid at the rotating shaft, thereby reducing the probability of mixing of the two perfusion fluids. In some embodiments, the second perfusion fluid is pure water. The above arrangement can prevent pure water from entering the human body, thereby improving the safety of perfusion. At the same time, it also allows the first perfusion fluid composed of glucose and other substances to be completely mixed with the fluid in the target environment, further improving the utilization rate of the solution.

[0023] (4) The flow area of ​​the first gap in the radial direction of the body of the present invention is larger than the flow area of ​​the second gap in the radial direction of the body. This arrangement results in a discontinuous transition structure between the first gap and the second gap, that is, there is a step change in the flow area. The step change causes a significant increase in the local pressure loss of the fluid. Due to the resistance to the fluid that significantly increases the pressure loss, it is difficult for the first perfusion liquid to overcome this resistance and flow toward the proximal end, and it is also difficult for the second perfusion liquid to overcome this resistance and flow toward the distal end. In other words, this step change can not only prevent the first perfusion liquid from flowing toward the proximal end, but also prevent the second perfusion liquid from flowing toward the distal end, thereby effectively isolating the two perfusion liquids and preventing them from mixing with each other. At the same time, since the direction of the first perfusion liquid flowing toward the proximal end is blocked, it is prevented from entering the friction pair of the bearing, effectively avoiding the problem of solute precipitation in the perfusion liquid caused by the continuous rotation and heating of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are provided for a better understanding of the present invention and are not intended to limit the present invention.

[0025] Figure 1 is a partial cross-sectional schematic diagram of a perfusion device according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the flow direction of the perfusion fluid according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a sealing cover according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of a bearing seat according to an embodiment of the present invention;

[0029] Figure 5 is a side view schematic diagram of a multi-lumen sheath according to an embodiment of the present invention;

[0030] Figure 6 is a three-dimensional schematic diagram of a multi-lumen sheath according to an embodiment of the present invention;

[0031] Figure 7 1 is a side view schematic diagram of another multi-lumen sheath according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding. These details should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0033] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0034] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0035] One type of percutaneous assisted blood pumping device features a separate blood pumping catheter and a drive module connected via a flexible transmission structure. The active drive module is located externally, and the flexible transmission structure drives the blood pumping catheter, which is inserted into the body, to provide assisted blood pumping. The blood pumping catheter comprises a pump body and a transmission system, which drives the pump body to operate and pump blood. Because both the pump body and transmission system are located within the human body, blood can flow into the transmission system of the blood pump device through the gap between the rotating and fixed components. Large amounts of blood entering the transmission system can affect the normal operation of the transmission system, causing increased load and transmission failure. Therefore, in the medical device field, a flowing perfusate is often used to prevent blood from entering the transmission system of the blood pump device. In related art, wear particles are generated in the transmission structure of the blood pump device, such as the flexible transmission element, impeller shaft, and bearings. When these wear particles enter the human body, they can form blood clots, endangering human life and health. To address this issue, the perfusate is often diverted so that a portion of the diverted perfusate flushes the wear particles and carries them out of the body. However, the perfusion fluid used in existing technologies is glucose solution or saline. In the aforementioned flushing scheme, when the blood pumping catheter is in operation, the bearings and flexible transmission elements rotate at high speeds. The heat generated can cause glucose or NaCl in the perfusion fluid to precipitate and adhere to the surfaces of the bearings, flexible transmission elements, and other components, thereby reducing the operating life of the bearings and flexible transmission elements and even causing the perfusion system to become clogged. If this occurs, the risk of failure of the transmission system, including the bearings and flexible transmission elements, is significantly increased, leading to failure of the blood pumping catheter.

[0036] In order to solve at least one of the above problems, the first aspect of the present invention provides a fluid perfusion device.

[0037] The fluid perfusion device includes a body and a rotating unit disposed through the body, wherein a first fluid passage and a second fluid passage are disposed within the body; a predetermined first perfusion fluid flows through the first fluid passage and is discharged into a target environment at the distal end of the body; a predetermined second perfusion fluid enters the body along an inlet of the second fluid passage and leaves the body along an outlet of the second fluid passage; the outlet of the second fluid passage is disposed adjacent to the inlet of the second fluid passage.

[0038] like Figure 1 and Figure 2 As shown, it discloses a partial cross-sectional schematic diagram of a fluid perfusion device. The main body of the fluid perfusion device includes a body and a rotating unit arranged through the body. The body constitutes the main structure of the perfusion device located inside the human body. The rotating unit may include an impeller 101 and a rotating shaft or a flexible transmission element. The rotating shaft or flexible transmission element is connected to the impeller 101 to transfer the driving load to the impeller and drive the impeller to rotate in a predetermined direction. In other embodiments, the rotating unit may also include only a rotating shaft. Figure 1 or Figure 2 The impeller in the figure is only an example. In practice, the blade structure and distribution of the impeller can be set according to actual needs. Furthermore, the outside of the impeller is usually provided with a tube body. In one embodiment, a first fluid passage 201 and a second fluid passage 202 are provided in the body; the first fluid passage 201 and the second fluid passage 202 are independent of each other inside the body, and are physically isolated by the elements inside the body so that the two circuits basically do not merge. From the perspective of use, the fluid perfusion device includes a distal end and a proximal end, wherein the distal end is the end away from the operator, and the proximal end is the end close to the operator. In actual use, the operator controls the fluid perfusion device at the proximal end, such as pouring perfusion liquid into it or controlling the rotation of the impeller. As Figure 2As shown, the first perfusate flows through the first fluid pathway and is discharged into the target environment at the distal end of the body. The port on the body through which the first perfusate is discharged into the target environment is the outlet of the first fluid pathway. For example, if the fluid perfusion device is used for clinical blood pumping assistance, the target environment is blood; if the fluid perfusion device is used for in vitro testing, the target environment is a test fluid environment. In this embodiment, the target environment is blood. The distal end can be the area between the impeller and the body. Furthermore, the first perfusate is entirely discharged into the target environment, without any diversion to flush particles. The second perfusate 202 enters the body through the inlet of the second fluid pathway and exits the body through the outlet of the second fluid pathway. In other words, the second perfusate flows only through the body without mixing with the fluid in the target environment, or directly enters the target environment, which can be a human body or a test environment, and the target environment can be human body fluids or a test environment solution. To facilitate the flow of perfusate into and out of the body, in one embodiment, the outlet of the second fluid pathway is located adjacent to the inlet of the second fluid pathway. Preferably, the outlet and inlet can be located at the same end of the body. The aforementioned inlet and outlet configurations ensure that the second perfusate flows only through the body, preventing it from entering the target environment. It should be noted that the present invention utilizes two perfusate fluids: a first perfusate that is discharged into the target environment, while a second perfusate that flows only through the body but does not enter the target environment. During its passage, the second perfusate removes heat generated by the body's friction pair, preventing excessive temperatures within various components within the body from causing precipitation of saline or glucose. In other words, the two perfusate fluids of the present invention flow through different channels and perform different functions, thereby avoiding the solute precipitation problems and low utilization of the first perfusate that are often associated with the use of a single first perfusate in the prior art. In particular, in designs where the body is primarily constructed of metal, the excellent thermal conductivity of metal can lead to solute precipitation at high temperatures in the first perfusate. Therefore, appropriately controlling the flow rate and initial temperature of the second perfusate can effectively address this precipitation problem. Preferably, the second fluid pathway is located near the friction pair within the body, or a portion of the second fluid pathway is formed by the body's friction pair, thereby enhancing its heat dissipation. It should be noted that the first perfusion liquid and the second perfusion liquid are not necessary for the implementation of the device of the present invention. The two perfusion liquids are only used to illustrate how the device of the present invention works. In actual use, those skilled in the art can select them according to needs.

[0039] In an optional embodiment, the inlet of the first fluid passage is arranged at the proximal end of the body; and / or, the inlet and outlet of the second fluid passage are both arranged at the proximal end of the body. Figure 1 or Figure 2In the embodiment shown, the inlet of the first fluid pathway and the inlet of the second fluid pathway are both arranged at the proximal end of the body to reduce the complexity of the connection of the two fluid pathways and facilitate the operator to respectively inject the two different perfusion fluids into the corresponding fluid pathways. Exemplarily, the two inlets can be arranged on the proximal end face of the multi-lumen sheath 107. This arrangement reduces the complexity of the pipeline routing and avoids problems such as the radial dimension of the perfusion device being too large, which affects the interventional nature of the instrument. Furthermore, the outlet of the second fluid pathway is also arranged at the proximal end of the body. In order to fully exert the flushing and heat dissipation effects of the second perfusion fluid, in one embodiment, the outlet of the second fluid pathway is preferably arranged at the fitting gap between the rotating unit and the body at the proximal end, so that the second perfusion fluid can flow out of the perfusion device through the surface of the rotating unit.

[0040] In an optional embodiment, the body includes a multi-lumen sheath, a sealing cover and a bearing seat, the multi-lumen sheath is arranged at the proximal end of the body, and the first fluid passage and the second fluid passage respectively pass through the multi-lumen sheath, the sealing cover and the bearing seat in sequence. Figure 1 and Figure 2 In the embodiment shown, the main body mainly includes components such as a multi-lumen sheath 107, a sealing cover 106 and a bearing seat 105. The multi-lumen sheath is arranged at the proximal end of the main body, and is used to guide the preset first perfusion liquid and the preset second perfusion liquid into the main body. The rotating unit is arranged through the axis of the above three components. In order to make full use of the space in the main body, in one embodiment of the present invention, the first fluid passage and the second fluid passage are both arranged inside the main body. Furthermore, in order to minimize the contact area between the first perfusion liquid and the friction pair in the main body, thereby reducing the problem of solute precipitation in the perfusion liquid caused by frictional heat, in one embodiment, the first fluid passage is constructed to penetrate the multi-lumen sheath 107 and then enter the main body, and then enter the bearing seat 105 through the flow channel inside the sealing cover 106, and finally flow out of the main body through the gap between the bearing seat 105 and the rotating unit and discharged into the target environment. Preferably, the first fluid passage is arranged at a position away from the friction pair to reduce the heat generated by the friction pair to cause solute precipitation in the perfusion liquid. Figure 1 or Figure 2 As shown, the connection between the body and the rotating unit is the main distribution area of ​​the friction pairs such as the rotating shaft and the bearing. The first fluid passage is arranged on the sealing cover and the bearing seat, both of which are far away from the bearing and the rotating shaft. Figure 4In the illustrated embodiment, the portion of the first fluid passageway located on the bearing seat is the first groove 401 on the sidewall of the bearing seat. Since the second fluid passageway serves as a channel for the second irrigating fluid, which is used to flush the friction pair and dissipate heat from the friction pair, the second fluid passageway runs entirely through the body and is distributed as close to the friction pair as possible to enhance heat dissipation. Of course, to ensure optimal distribution of the second fluid passageway, the portion of the second fluid passageway located on the bearing seat is the second groove 402 located near the outer periphery of the bearing seat. The first groove 401 and the second groove 402 are physically isolated. In some embodiments, the body further includes a sealing sleeve 102, which is mounted on the exterior of the body and cooperates with the bearing seat and sealing cover to form a portion of the first fluid passageway. In some optional embodiments, the components forming the first and second fluid passageways are further provided with sealing elements to isolate and seal the passageways, preventing fluid from mixing between the passageways. In other embodiments, the number of first and second fluid passageways is not limited to one and can be set according to actual needs.

[0041] In an optional embodiment, a first gap is included between the bearing seat and the rotating unit, and the portion of the first fluid passage located at the distal end of the bearing seat merges with the first gap at a first confluence portion 203. Figure 1 or Figure 2 In the embodiment shown, the portion of the first fluid passage located at the distal end of the bearing seat extends radially, thereby merging with the first gap between the bearing seat and the rotating unit at the first merging portion 203. Figure 2 As shown, the first confluence 203 is the connecting portion of the two fluid channels. This indicates that the portion of the first fluid passage located at the distal end of the bearing seat extends toward the rotating unit in a direction substantially perpendicular to the axis of the rotating unit, merging with the first gap upon leaving the bearing seat. It is understood that, under operating conditions, the fluid of the target environment pumped by the impeller 101 will enter the first gap. To this end, it is necessary for the first perfusion fluid to be able to enter the first gap and utilize the pressure of the perfusion fluid to force the fluid of the target environment out of the first gap; this prevents the fluid of the target environment from entering the transmission system of the perfusion device, thereby affecting the normal operation of the transmission system, causing problems such as increased load and transmission failure.

[0042] In an optional embodiment, a second gap is further included between the bearing seat and the rotating unit, and the portion of the second fluid passage located at the distal end of the bearing seat merges with the second gap at a second confluence portion 204. Figure 2As shown, the portion of the second fluid passageway at the distal end of the bearing seat extends toward the rotating unit in a direction substantially perpendicular to the axis of the rotating unit, merging with the second gap upon exiting the bearing seat. To create a circuit capable of cooling and flushing the friction pair, in one embodiment of the present invention, the portion of the second fluid passageway at the distal end of the bearing seat is radially arranged and merges with the second gap between the bearing seat and the rotating unit at a second confluence 204. This allows the second perfusion fluid, after flowing through the bearing seat, to exit the perfusion device along the friction pair, such as the rotating shaft.

[0043] In an optional embodiment, the first confluence portion is closer to the distal end of the rotating unit than the second confluence portion. Figure 2 In the illustrated embodiment, both the first confluence 203 and the second confluence 204 are located at the distal end of the body, but the first confluence is closer to the impeller 101, while the second confluence is closer to the bearing. This arrangement increases the distance between the first and second perfusates at the location where they flow through the rotating shaft. It should be noted that since the target environment fluid, the first and second perfusates all have certain pressures, appropriately increasing the axial distance between the first and second confluences 203 and 204 can reduce the probability of mixing between the two perfusates. For example, in actual operation, the pressure of the first perfusate can be set to be greater than the pressure of the second perfusate, and the pressure of the second perfusate can be set to be greater than the pressure of the target environment fluid. Therefore, the back pressure exerted by the second perfusate on the first perfusate is greater than the back pressure exerted by the pressure of the target environment fluid on the first perfusate, causing substantially all of the first perfusate to flow out of the body and into the target environment. The pressure of the first perfusate can also prevent the second perfusate from flowing distally and force it to flow proximally along the friction pair. In practice, the second perfusion liquid is pure water. The above setting can prevent pure water from entering the human body, thereby improving the safety of perfusion; at the same time, it also allows the first perfusion liquid composed of glucose and the like to be completely discharged into the target environment, thereby improving the utilization rate of the solution.

[0044] In one optional embodiment, the radial flow area of ​​the first gap is greater than the radial flow area of ​​the second gap. In practice, because the second perfusate encounters significant fluid resistance during its return along the friction pair, preventing some of the second perfusate from flowing distally along the rotating shaft is particularly important. To this end, one embodiment addresses this issue by rationally controlling the dimensions of the first and second gaps. Preferably, the aforementioned issue can be addressed by controlling the fluid flow areas at both gaps. For example, the radial flow area of ​​the first gap can be set to be greater than the radial flow area of ​​the second gap. This configuration results in a discontinuous transition between the first and second gaps, i.e., a step change in flow area. This step change significantly increases the local pressure loss of the fluid. This step change not only prevents the first perfusate from flowing proximally, but also prevents the second perfusate from flowing distally, thereby effectively isolating the two perfusates and preventing them from mixing. At the same time, since the proximal flow of the first perfusion fluid is blocked, it is prevented from entering the bearing's friction pair, effectively avoiding the problem of solute precipitation in the perfusion fluid due to heat. In practice, a step change in the flow area can be achieved by controlling the radial dimensions of the first and second gaps. The specific dimensions can be set according to actual needs and are not specifically limited here.

[0045] In an optional embodiment, a bearing is provided between the bearing seat and the rotating unit, and the second perfusion liquid flows through the second confluence portion to flush the outer surface of the rotating unit and the friction pair of the bearing. Figure 1 and Figure 2 As shown, the rotating unit includes a rotating shaft 104. At least two bearings 103 are disposed between the rotating shaft and the bearing seat. These bearings provide rotational support for the high-speed rotation of the rotating shaft. It is understood that when the rotating shaft rotates at high speed, it will drive the inner ring of the bearing to rotate at high speed. This will cause the friction pair of the bearing to produce fine particles and generate heat during long-term operation. These particles, upon entering the human body, can form blood clots, endangering human health. Furthermore, the heat can cause solutes in the first perfusion fluid to precipitate. To this end, one embodiment forms a second fluid pathway on the friction pair, allowing the second perfusion fluid to flow through the surface of the rotating shaft and the friction pair of the bearing, and then out of the body through the gap between the multi-lumen sheath and the rotating shaft. This removes the aforementioned heat and particles from the perfusion device, improving the safety and service life of the perfusion device.

[0046] In an optional embodiment, the sealing cover includes a separation unit, and the separation unit enables the first perfusion liquid and the second perfusion liquid entering the bearing seat to remain separated from each other. In one embodiment, the first perfusion liquid and the second perfusion liquid both enter the interior of the main body through different channels on the multi-lumen sheath, and the types of the two perfusion liquids are different, so how to avoid the two perfusion liquids from mixing after entering the main body is an issue that needs to be focused on. At the same time, taking into account the design and assembly difficulty of the main body structure, an embodiment of the present invention solves this problem by providing an independent sealing cover. The sealing cover is assembled between the multi-lumen sheath and the bearing seat, and one end is installed in the bearing seat, and the other end extends along the inner hole of the multi-lumen sheath. Furthermore, the sealing cover is provided with a radially protruding separation unit, such as a partition 301, and the partition is evenly distributed in the circumferential direction of the sealing cover body 302. The partition 301 includes at least two pieces, thereby separating the outer periphery of the sealing cover body into at least two flow channels, and the flow channels are respectively used to circulate the corresponding perfusion liquids. As Figure 2 As shown, the partition cooperates with the multi-lumen sheath, the sealing sleeve and the bearing seat to form an independent flow channel.

[0047] In an optional embodiment, the inlet of the first fluid passage and the inlet of the second fluid passage differ in at least one of size, shape or number. Since the present invention uses two different perfusates, and the pipes through which the two perfusates flow are completely different, in order to prevent the operator from incorrectly connecting the pipes or incorrectly perfusing the liquids, a special structural design is required for the two fluid passages to distinguish them. To this end, at least one of the size, shape and number of the inlets of the two fluid passages can be different. For example Figure 7 As shown, the inlet 702 with a circular cross section can be used as the inlet of the first fluid passage, and the inlet 701 with a trapezoidal cross section can be used as the inlet of the second fluid passage. For solutions with multiple inlets, the inlets can be evenly distributed along the end surface of the multi-lumen sheath. In some embodiments, the first fluid passage and the second fluid passage can be configured as concentric arcs in the multi-lumen sheath, and the number of the first fluid passage and the second fluid passage can be greater than 1, so as to increase the flow area of ​​the liquid and thus improve the perfusion efficiency of the liquid. Figure 5 As shown, a group of fluid passages can be processed on the upper semicircle and the lower semicircle respectively, wherein the inner circle passage 502 is the second fluid passage and the outer circle passage 501 is the first fluid passage.

[0048] Another aspect of the present invention provides a blood pumping device, which comprises any fluid perfusion device described in the first aspect.

[0049] The above specific embodiments do not constitute a limitation on the scope of protection of the present invention. After considering the specification and practicing the technical solutions disclosed in this application, those skilled in the art will easily think of other embodiments of the present disclosure. This application is intended to cover any variations, uses or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in this disclosure. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0050] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A fluid perfusion device, characterized in that: It comprises a body and a rotating unit arranged through the body, wherein a first fluid passage and a second fluid passage are arranged in the body; A preset first perfusion fluid flows through the first fluid passage and is discharged into a target environment at the distal end of the body; The preset second perfusion liquid enters the body along the inlet of the second fluid passage and leaves the body along the outlet of the second fluid passage; the outlet of the second fluid passage is arranged adjacent to the inlet of the second fluid passage; The first perfusion liquid and the second perfusion liquid are different; and the first fluid passage and the second fluid passage are independent of each other inside the body.

2. The fluid perfusion device according to claim 1, characterized in that The inlet of the first fluid passage is arranged at the proximal end of the body; and / or, the inlet and outlet of the second fluid passage are both arranged at the proximal end of the body.

3. The fluid perfusion device according to claim 1, characterized in that The body comprises a multi-lumen sheath, a sealing cover and a bearing seat. The multi-lumen sheath is arranged at the proximal end of the body. The first fluid passage and the second fluid passage respectively pass through the multi-lumen sheath, the sealing cover and the bearing seat in sequence.

4. The fluid perfusion device according to claim 3, characterized in that: A first gap is included between the bearing seat and the rotating unit, and a portion of the first fluid passage located at the distal end of the bearing seat merges with the first gap at a first confluence portion.

5. The fluid perfusion device according to claim 4, characterized in that: A second gap is further provided between the bearing seat and the rotating unit, and the portion of the second fluid passage located at the distal end of the bearing seat merges with the second gap at a second confluence portion.

6. The fluid perfusion device according to claim 5, characterized in that: The first confluence portion is closer to the distal end of the rotating unit than the second confluence portion.

7. The fluid perfusion device according to claim 5, characterized in that: The flow area of ​​the first gap in the radial direction of the body is larger than the flow area of ​​the second gap in the radial direction of the body.

8. The fluid perfusion device according to claim 5, characterized in that: A bearing is provided between the bearing seat and the rotating unit. The preset second perfusion liquid flows through the second confluence portion and then flushes the outer surface of the rotating unit and the friction pair of the bearing.

9. The fluid perfusion device according to claim 3, characterized in that: The sealing cover includes a separation unit, and the separation unit enables the preset first perfusion liquid and the preset second perfusion liquid entering the bearing seat to remain separated from each other.

10. The fluid perfusion device according to claim 9, characterized in that: At least two of the separation units are provided, and they protrude radially from the sealing cover and are spaced apart along the circumference of the sealing cover. The separation units cooperate with the multi-lumen sheath and the bearing seat to form at least two flow gaps, wherein part of the flow gaps is used for the circulation of a preset first perfusion liquid, and the remaining part of the flow gaps is used for the circulation of a preset second perfusion liquid.

11. The fluid perfusion device according to claim 2, characterized in that: The inlet of the first fluid passage and the inlet of the second fluid passage are different in at least one of size, shape or number.

12. A blood pumping device, comprising the fluid perfusion device according to any one of claims 1 to 11.

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