Fluid filling device

Abstract

The invention provides a fluid filling device which comprises a body and a rotating unit penetrating through the body, and a first fluid passage and a second fluid passage are arranged in the body; first perfusate flows through the first fluid passage and then is discharged into a target environment from the far end of the rotating unit; the second perfusate enters the body along an inlet of the second fluid passage and leaves the body along an outlet of the second fluid passage; and the outlet of the second fluid passage is close to the inlet of the second fluid passage. Two fluid passages are constructed, two perfusion fluids are adopted, the first perfusion fluid is discharged into the target environment, the second perfusion fluid can take away heat generated by a friction pair of the body in the process of penetrating through the body, and the problems that normal saline or glucose is separated out and a transmission system is damaged are solved. The second perfusate can effectively scour the friction pair to prevent wear particles from entering the human body.

Description

Technical Field

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

[0002] In the field of medical devices, the method of filling flowing perfusion fluid is often used to prevent blood from entering the transmission system of the blood pumping device. In the blood pumping device, wear particles will be generated in the transmission device such as the flexible transmission element, and the impeller shaft and the bearing. When the wear particles enter the human body with the perfusion fluid, blood clots will be formed, endangering human life and health. In addition, the perfusion fluid used in the prior art is a glucose solution or 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 bearings, flexible transmission elements and other parts. The surface will reduce the operating life of the bearings, flexible transmission elements, etc., and even the risk of clogging the perfusion system. If clogging occurs, the risk of failure of the transmission system such as 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 injection device comprises a body and a rotating unit arranged through the body. Wherein, a first fluid passage and a second fluid passage are provided in the body; The 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; 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] In an optional embodiment, a second gap is further included between the bearing seat and the rotating unit, and a portion of the second fluid passage located at the far end of the bearing seat merges with the second gap at a second confluence portion.

[0009] In an optional embodiment, the first confluence portion is closer to the distal end of the rotation unit than the second confluence portion.

[0010] 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.

[0011] In an optional embodiment, a bearing is provided between the bearing seat and the rotating unit, and a preset 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.

[0012] In an optional embodiment, the sealing cover includes a separation unit, and the separation unit allows a preset first perfusion liquid and a preset second perfusion liquid entering the bearing seat to remain separated from each other.

[0013] 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 are used for the circulation of a preset first perfusion liquid, and the remaining part of the flow gaps are used for the circulation of a preset second perfusion liquid.

[0014] 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.

[0015] Another aspect of the present invention provides a blood pumping device, which includes any fluid perfusion device described in the first aspect.

[0016] The technical solution of the present invention has the following advantages or beneficial effects: (1) The perfusion device of the present invention has two fluid passages 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; while the second perfusion fluid only passes through the body but does not enter the human body. During the passage of the second perfusion fluid, the heat generated by the friction pair of the body can be taken away, thereby preventing the problem of precipitation of perfusion fluid solutes such as physiological saline or glucose due to excessive temperature of various components in the body. In other words, the two perfusion fluids of the present invention flow in different channels respectively and achieve 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 that part of the first perfusion fluid cannot be used to mix the fluid in the target environment.

[0017] (2) The first fluid passage and the second fluid passage respectively penetrate 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; 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 load increase, transmission failure and other problems. The part of the second fluid passage inside the bearing seat is set to penetrate along 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, achieving the purpose of cooling and flushing the friction pair, and avoiding various risks caused by wear particles entering the human body.

[0018] (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 liquid and the second perfusion liquid at the rotating shaft, which can reduce the probability of mixing of the two perfusion liquids. In some embodiments, the second perfusion liquid is pure water, and the above arrangement can prevent pure water from entering the human body, thereby improving the safety of perfusion; at the same time, the first perfusion liquid composed of glucose and the like is completely mixed with the fluid of the target environment, further improving the utilization rate of the solution.

[0019] (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 setting method causes the transition structure between the first gap and the second gap to be discontinuous, that is, there is a step change in the flow area, and the step change causes a significant increase in the local pressure loss of the fluid. Since there is a resistance to the fluid that greatly increases the pressure loss, it is difficult for the first perfusion liquid to overcome the resistance and flow toward the proximal end, and it is also difficult for the second perfusion liquid to overcome the resistance and flow toward the distal end. That is, the 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 of the perfusion liquid caused by the continuous rotation and heating of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention. Figure 1 is a partial cross-sectional schematic diagram of a perfusion device according to an embodiment of the present invention; Figure 2 is a schematic diagram of the flow direction of the perfusion fluid according to an embodiment of the present invention; Figure 3 is a schematic diagram of a sealing cover according to an embodiment of the present invention; Figure 4 is a schematic diagram of a bearing seat according to an embodiment of the present invention; Figure 5 is a side view schematic diagram of a multi-lumen sheath according to an embodiment of the present invention; Figure 6 is a three-dimensional schematic diagram of a multi-lumen sheath according to an embodiment of the present invention; Figure 7 4 is a side view schematic diagram of another multi-lumen sheath according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill 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 clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0022] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0023] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the 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".

[0024] One of the percutaneous auxiliary blood pumping devices is a device that separately sets the blood pumping catheter and the driving module, and the blood pumping catheter and the driving module are connected by a flexible transmission structure. The active driving module is located outside the body, and the flexible transmission structure drives the blood pumping catheter inserted into the body to realize the auxiliary blood pumping function. The blood pumping catheter includes a pump body and a transmission system, and the transmission system drives the pump body to operate to realize the function of the pump body to pump blood. Since the pump body and the transmission system are both located in the human body, blood will flow into the transmission system of the blood pumping device from the gap between the rotating part and the fixed part. A large amount of blood entering the transmission system will affect the normal operation of the transmission system, causing problems such as increased load and transmission failure. Therefore, in the field of medical devices, a flowing perfusion liquid filling method is often used to prevent blood from entering the transmission system of the blood pumping device. In the related art, the transmission structure of the blood pumping device, such as the flexible transmission element, the impeller shaft and the bearing, will produce wear particles. When the wear particles enter the human body, thrombus will be formed, endangering human life and health. For this reason, the perfusion liquid is often diverted in the prior art so that a part of the diverted perfusion liquid flushes the wear particles and takes them out of the human body. However, the perfusion fluid used in the prior art is glucose solution or physiological saline. In the above flushing scheme, when the blood pumping catheter is running, the bearings and flexible transmission elements rotate at high speed, and the heat generated 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, thereby reducing the operating life of the bearings and flexible transmission elements, and even causing the perfusion system to be blocked. If 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 catheter to fail.

[0025] In order to solve at least one of the above problems, the first aspect of the present invention provides a fluid perfusion device.

[0026] The fluid perfusion device 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 liquid flows through the first fluid passage and is discharged into a target environment at the distal end of the body; a preset second perfusion liquid enters the body along an inlet of the second fluid passage and leaves the body along an outlet of the second fluid passage; and the outlet of the second fluid passage is arranged adjacent to the inlet of the second fluid passage.

[0027] 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, and the rotating shaft or the 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 only include 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 impeller is usually provided with a tube body on the outside. 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 with each other. 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, for example, by pouring perfusion liquid into it or controlling the rotation of the impeller. As Figure 2As shown, the first perfusion liquid flows through the first fluid passage and is discharged into the target environment at the distal end of the body, and the port on the body for the first perfusion liquid to be discharged into the target environment is the outlet of the first fluid passage. For example, if the fluid perfusion device is used for clinical auxiliary blood pumping, the target environment is blood; if the fluid perfusion device is used for in vitro testing, the target environment is a liquid environment for testing; in this embodiment, the target environment is blood as an example. The distal end here can be the area between the impeller and the body. Further, the first perfusion liquid is completely discharged into the target environment, and there is no function of flushing particles after diversion. The second perfusion liquid 202 enters the body along the inlet of the second fluid passage and leaves the body along the outlet of the second fluid passage; in other words, the second perfusion liquid only flows through the body, but will not mix with the fluid of the target environment, or directly enters the target environment, where the target can be a human body or a test environment, and the target environment can be a human body fluid or a test environment solution. In order to achieve the perfusion liquid entering and flowing out of the body, the outlet of the second fluid passage in one embodiment is arranged adjacent to the inlet of the second fluid passage. Preferably, the outlet and the inlet can be arranged at the same end of the body. The above-mentioned inlet and outlet are arranged so that the second perfusion liquid only flows through the body, but does not pass through the body into the target environment. It should be noted that the present invention adopts two perfusion fluids, the first perfusion liquid is discharged into the target environment, and the second perfusion liquid only passes through the body but does not enter the target environment. The second perfusion liquid can take away the heat generated by the friction pair of the body during the passage, avoiding the problem of physiological saline or glucose precipitation due to excessive temperature of each component in the body. In other words, the two perfusion fluids of the present invention flow in different channels respectively, and respectively achieve different functions, thereby avoiding the problem of perfusion liquid solute precipitation caused by the same first perfusion liquid used in the prior art, and the problem of low utilization rate of the first perfusion liquid. In particular, in the scheme where the body is mainly made of metal materials, due to the good thermal conductivity of the metal, the first perfusion liquid will face the problem of high-temperature precipitation of solutes, so appropriately controlling the flow rate and initial temperature of the second perfusion liquid can effectively solve the above-mentioned precipitation problem. Preferably, the second fluid passage is arranged close to the friction pair in the body, or part of the second fluid passage is formed by the friction pair of the body, so as to improve its heat dissipation effect. 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.

[0028] 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 illustrated embodiment, the inlet of the first fluid passage and the inlet of the second fluid passage are both arranged at the proximal end of the body to reduce the connection complexity of the two fluid passages and facilitate the operator to respectively pour the two different perfusion fluids into the corresponding fluid passages. 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 the problem that the radial dimension of the perfusion device is too large and affects the interventional nature of the device. Furthermore, the outlet of the second fluid passage is also arranged at the proximal end of the body. In order to give full play to the flushing and heat dissipation effect of the second perfusion fluid, in one embodiment, the outlet of the second fluid passage 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.

[0029] In an optional embodiment, 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, 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 illustrated embodiment, 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 a preset first perfusion liquid and a preset second perfusion liquid into the main body. The rotating unit is arranged to pass 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 generation, in one embodiment, the first fluid passage is constructed to enter the main body after penetrating the multi-lumen sheath 107, 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, and 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 embodiment shown, the portion of the first fluid passage located on the bearing seat is the first groove 401 on the side wall of the bearing seat. Since the second fluid passage serves as a channel for the second perfusion fluid, the perfusion fluid is used to flush the friction pair and dissipate heat for the friction pair at the same time, so the second fluid passage runs through the body as a whole and is distributed as close to the friction pair as possible to improve its heat dissipation effect. Of course, in order to reasonably distribute the second fluid passage, the portion of the second fluid passage located on the bearing seat is the second groove 402 arranged near the outer peripheral side 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 arranged on the outside of the body and can cooperate with the bearing seat and the sealing cover to form part of the first fluid passage. In some optional embodiments, a sealing element is also provided on the element forming the first fluid passage and the second fluid passage, and the sealing element is used to isolate and seal each passage to avoid fluid mixing between different passages. In other embodiments, the number of the first fluid passage and the second fluid passage is not limited to 1, and can be set according to actual needs when used.

[0030] In an optional embodiment, a first gap is included between the bearing seat and the rotating unit, and 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 illustrated embodiment, the portion of the first fluid passage located at the distal end of the bearing seat extends radially so as to merge with the first gap between the bearing seat and the rotating unit at the first merge portion 203. Figure 2 As shown, the first confluence 203 is the connection part of the two fluid channels. It indicates that the part of the first fluid passage located at the far end of the bearing seat extends toward the direction of the rotating unit in a direction substantially perpendicular to the axis of the rotating unit, and merges with the first gap when leaving the bearing seat. It can be understood that in the working state, the fluid of the target environment pumped by the impeller 101 will enter the first gap. For this purpose, it is necessary for the first perfusion liquid to be able to enter the first gap, and use the pressure of the perfusion liquid to force the fluid of the target environment to leave the first gap; avoid the fluid of the target environment from entering the transmission system of the perfusion device, which affects the normal operation of the transmission system, causing problems such as load increase and transmission failure.

[0031] 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 the second confluence portion 204. Figure 2As shown, it shows that the portion of the second fluid passage located at the far end of the bearing seat extends in the direction of the rotating unit in a direction substantially perpendicular to the axis of the rotating unit, and merges with the second gap when leaving the bearing seat. In order to construct a circuit capable of cooling and flushing the friction pair, in one embodiment of the present invention, the portion of the second fluid passage located at the far end of the bearing seat is arranged along the radial direction, and merges with the second gap between the bearing seat and the rotating unit at the second confluence 204, so that the second perfusion fluid can flow out of the perfusion device along the friction pair such as the rotating shaft after flowing through the bearing seat.

[0032] 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 embodiment shown, the first confluence 203 and the second confluence 204 are both arranged at the distal end of the body, but the first confluence is closer to the impeller 101, while the second confluence is arranged closer to the bearing. The above arrangement increases the distance at which the first perfusion liquid and the second perfusion liquid flow through the rotating shaft. It should be noted that, since the fluid of the target environment, the first perfusion liquid and the second perfusion liquid all have a certain pressure, appropriately increasing the axial distance between the first confluence 203 and the second confluence 204 can reduce the probability of mixing of the two perfusion liquids. For example, in actual operation, the pressure of the first perfusion liquid can be set to be greater than the pressure of the second perfusion liquid, and the pressure of the second perfusion liquid can be set to be greater than the pressure of the fluid of the target environment. Therefore, the back pressure formed by the second perfusion liquid on the first perfusion liquid is greater than the back pressure formed by the pressure of the fluid of the target environment on the first perfusion liquid, so that the first perfusion liquid basically flows out of the body and is discharged into the target environment. The pressure of the first perfusion liquid can also prevent the second perfusion liquid from flowing to the distal end, and force the second perfusion liquid to flow to the proximal end along the friction pair. In practice, the second perfusion liquid 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, the first perfusion liquid composed of glucose and the like can be completely discharged into the target environment, thereby improving the utilization rate of the solution.

[0033] 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. In practice, since the second perfusion liquid encounters a large fluid resistance during the backflow process along the friction pair, it is particularly important to prevent part of the second perfusion liquid from flowing toward the distal end along the rotating shaft. To this end, in one embodiment, the problem is solved by reasonably controlling the size of the first gap and the second gap. Preferably, the above problem can be solved by controlling the flow area of ​​the fluid at the two gaps. For example, the flow area of ​​the first gap in the radial direction of the body is set to be larger than the flow area of ​​the second gap in the radial direction of the body. The above setting method causes the transition structure between the first gap and the second gap to be a discontinuous form, that is, there is a step change in the flow area, and the step change causes a significant increase in the local pressure loss of the fluid. The 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 of the perfusion liquid caused by heat. In practice, the step change of the flow area can be achieved by controlling the radial dimensions of the first gap and the second gap. The specific dimensions can be set according to actual needs and are not specifically limited here.

[0034] 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, and at least two bearings 103 are arranged between the rotating shaft and the bearing seat, and the bearings provide rotation support for the high-speed rotation of the rotating shaft. It can be understood that when the rotating shaft rotates at a high speed, it will drive the inner ring of the bearing to rotate at a high speed, and the friction pair of the bearing will produce fine particles and generate heat during long-term operation. After the particles enter the human body, they will form blood clots and endanger human life and health. And the heat will cause the solute in the first perfusion liquid to precipitate. To this end, an embodiment forms a second fluid passage on the friction pair, and allows the second perfusion liquid to flow through the surface of the rotating shaft and the friction pair of the bearing, and flow out of the body from the gap between the multi-lumen sheath and the rotating shaft, so as to take the heat and particles described above away from the perfusion device, thereby improving the safety and service life of the perfusion device.

[0035] In an optional embodiment, the sealing cover includes a separation unit, and the separation unit allows 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 two perfusion liquids are of different types. Therefore, how to avoid the two perfusion liquids from mixing after entering the main body is an issue that needs to be focused on. Taking into account the design and assembly difficulty of the main body structure, an independent sealing cover is provided in one embodiment of the present invention to solve this problem. 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.

[0036] 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 perfusion fluids, and the two perfusion fluids flow through completely different pipelines. Therefore, in order to prevent operators from incorrectly connecting pipelines or incorrectly perfusing liquids, it is necessary to perform special structural design on 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 may 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 the solution with multiple inlets, each inlet 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 each is greater than 1, so as to increase the flow area of ​​the liquid, thereby improving 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.

[0037] Another aspect of the present invention provides a blood pumping device, wherein the blood pumping device comprises any fluid perfusion device described in the first aspect.

[0038] The above specific implementation methods 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 implementation methods of the present disclosure. This application is intended to cover any modification, use 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 technical field that are not disclosed in the present disclosure. The description and examples are regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0039] 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 may 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, Features: It includes a main body and a rotating unit arranged through the main body, Wherein, a first fluid passage and a second fluid passage are provided 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.

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 penetrate 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 far 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 also included between the bearing seat and the rotating unit, and the portion of the second fluid passage located at the far 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 confluent portion is closer to the distal end of the rotating unit than the second confluent 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 greater 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 arranged between the bearing seat and the rotating unit, and a preset 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.

9. The fluid perfusion device according to claim 3, characterized in that: The sealing cover comprises 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 are used for the circulation of a preset first perfusion liquid, and the remaining part of the flow gaps are 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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