Interventional fluid pumping device

Abstract

The present application provides an interventional fluid pumping device, comprising: a supporting main body, wherein the proximal end of the supporting main body is provided with at least one proximal-end channel penetrating through the side wall of the supporting main body, and the distal end of the supporting main body is provided with at least one distal-end channel penetrating through the side wall of the supporting main body; and an expandable structure, arranged on the outer surface of the side wall of the supporting main body and covering the proximal-end channel and the distal-end channel, wherein the expandable structure moves away from the outer surface of the supporting main body in a pressurized state so as to establish a fluid channel between the inner surface of the expandable structure and the outer surface of the side wall of the supporting main body, the fluid channel is respectively communicated with the proximal-end channel and the distal-end channel, and the expandable structure is at least partially attached to the outer surface of the side wall of the supporting main body in an unpressurized state.

Description

An interventional fluid pumping device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311266149.X, filed on September 28, 2023, entitled “An Interventional Fluid Pumping Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of medical devices, and in particular to an invasive fluid pumping device. Background Art

[0004] In the related art, ventricular assist devices provide patients with stable blood delivery support, reduce cardiac burden, and minimize intraoperative risks, thus facilitating their postoperative recovery. The main component of a ventricular assist device is the blood pumping catheter. The smaller the size of the blood pumping catheter, the smaller the wound caused to the patient, which can reduce the patient's pain. In the related art, the structural design is usually optimized to reduce the radial size of the device, and / or part of the structure is configured to be compressible and foldable to achieve the purpose of reducing the size of the blood pumping catheter.

[0005] However, the need for perfusate inflow and outflow channels within the blood pumping catheter prevents further reduction of its radial dimensions. Furthermore, the integration of the perfusate channels within the blood pumping catheter prevents some components from being foldable or compressible. Consequently, the related art has encountered a bottleneck in further reducing the radial dimensions of the blood pumping catheter.

[0006] Application Contents

[0007] In order to overcome at least one of the problems in the related art, in a first aspect of the present application, an intrusive fluid pumping device is provided.

[0008] Wherein, the interventional fluid pumping device comprises:

[0009] A support body, wherein the proximal end of the support body is provided with at least one proximal channel penetrating the side wall of the support body, and the distal end of the support body is provided with at least one distal channel penetrating the side wall of the support body;

[0010] an expandable structure, provided on the outer surface of the side wall of the support body and covering the proximal channel and the distal channel;

[0011] In which, the expandable structure is away from the outer surface of the supporting body in a pressurized state to establish a fluid channel between the inner surface of the expandable structure and the outer surface of the side wall of the supporting body, and the fluid channel is connected to the proximal channel and the distal channel respectively; the expandable structure will at least partially adhere to the outer surface of the side wall of the supporting body in an unpressurized state.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, an inflow channel is provided in the support body, the inflow channel extends from the proximal end position of the support body to the proximal channel position, and the inflow channel is communicated with the proximal channel;

[0013] An outflow channel is provided in the support body, and the outflow channel extends from the distal channel position to the distal end position of the support body, and the outflow channel is communicated with the distal channel.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, a waste liquid channel is provided in the support body, the waste liquid channel extends from the distal channel position to the proximal position of the support body, and the waste liquid channel is connected to the distal channel, and the waste liquid channel is isolated from the inflow channel.

[0015] According to any of the aforementioned embodiments of the first aspect of the present application, the expandable structure includes a flexible element.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the flexible element includes a thin film or a soft film.

[0017] According to any of the aforementioned embodiments of the first aspect of the present application, the expandable structure includes an elastomeric structure.

[0018] According to any of the aforementioned embodiments of the first aspect of the present application, the wall thickness of the expandable structure in a direction perpendicular to the fluid channel is in the range of 0.01 mm to 0.5 mm.

[0019] According to any of the aforementioned embodiments of the first aspect of the present application, in the direction from the distal end to the proximal end, the support body includes a distal segment, a middle segment and a tail cover, wherein the radial dimension of the middle segment is larger than the radial dimension of the distal segment, and the radial dimension of the middle segment is larger than the radial dimension of the tail cover.

[0020] According to any of the aforementioned embodiments of the first aspect of the present application, the distal end of the expandable structure is sealedly connected to the outer wall of the distal segment of the support body; the proximal end of the expandable structure is sealedly connected to the outer wall of the tail cover of the support body.

[0021] According to any of the aforementioned embodiments of the first aspect of the present application, the proximal channel and the distal channel are both located on the middle section; the distal end of the expandable structure is sealed and connected to the distal surface of the middle section, and the proximal end of the expandable structure is sealed and connected to the proximal surface of the middle section.

[0022] According to any of the aforementioned embodiments of the first aspect of the present application, the fluid pumping device further comprises a first clamp, which is sleeved on the proximal outer wall of the expandable structure to press the expandable structure against the outer wall of the support body.

[0023] According to any of the aforementioned embodiments of the first aspect of the present application, the first clamp includes a notch, and the notch penetrates the side wall of the first clamp along the axial direction.

[0024] According to any of the aforementioned embodiments of the first aspect of the present application, the fluid pumping device further comprises a bracket, the bracket being radially expandable and foldable, and the radial dimension of the bracket in the folded state is smaller than the radial dimension of the support body;

[0025] The bracket includes a first connecting portion, and the distal end of the support body includes a second connecting portion. The first connecting portion and the second connecting portion are cooperatively connected to dispose the bracket at the distal end of the support body.

[0026] According to any of the aforementioned embodiments of the first aspect of the present application, one of the first connecting portion and the second connecting portion includes a slot, and the other includes a buckle, and the slot and the buckle are snap-connected.

[0027] According to any of the aforementioned embodiments of the first aspect of the present application, the stent is further sleeved on the outer wall of the expandable structure.

[0028] According to any of the aforementioned embodiments of the first aspect of the present application, the fluid pumping device further includes a second clamp, which is sleeved on the outside of the bracket, and the position of the second clamp corresponds to the position of the expandable structure.

[0029] The technical solution of this application has the following advantages or beneficial effects:

[0030] (1) The present application adopts an expandable structure to temporarily establish a partial fluid channel so that the perfusion liquid can enter the support body through the fluid channel, thereby effectively utilizing the expansion and contraction characteristics of the expandable structure, so that the radial size of the fluid pumping device in the initial state is only slightly larger than the diameter of the support body. Compared with the existing technology, the present application does not need to pre-process all the perfusion liquid inflow channels in the fluid device, that is, it does not need to reserve a solid body on the support body to process all the perfusion liquid inflow channels on the solid body, so the radial size of the support body can be reduced, thereby reducing the size of the pumping device as a whole. When the fluid pumping device needs to intervene in the target environment, before reaching the target position, the perfusion liquid is not injected into the support body, and the expandable structure is abutted against the surface of the support body to keep the fluid pumping device in the smallest radial size state, thereby reducing the trauma area of ​​the intervention operation to the patient.

[0031] (2) The present invention connects the proximal end of the expandable structure to a location on the support body where the proximal diameter is smaller, and the distal end of the expandable structure to a location on the support body where the distal diameter is smaller, thereby eliminating the effect of the dimensions of the connection on the radial dimensions of the fluid pumping device. Furthermore, the expandable structure is sealed to both the proximal and distal ends of the support body, thereby preventing leakage of the perfusion fluid into the target environment and improving the safety and reliability of the device.

[0032] (3) The present invention stably and hermetically connects the expandable structure to the supporting body by bonding or welding, effectively ensuring the safety and reliability of the fluid pumping device. In addition, by providing a clamp on the outside of the expandable structure, the problem of separation of the expandable structure can be avoided, further improving the connection strength of the expandable structure and enhancing the reliability of the fluid pumping device.

[0033] (4) The present application constructs an inflow channel, an outflow channel and a waste liquid discharge channel in the pumping device, so that part of the perfusion liquid entering the pumping device flows out through the outflow channel to prevent the fluid in the target environment from entering the interior of the pumping device; part of the perfusion liquid enters the waste liquid discharge channel to flush the friction pair to take away the heat generated by the friction pair, and at the same time flush out the wear particles to prevent the heat from affecting the patient's safety and the normal operation of the fluid pumping device, and also to prevent the wear particles from entering the patient's body. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are provided to facilitate a better understanding of the present application and do not constitute an undue limitation on the present application.

[0035] FIG1 is a schematic diagram of a longitudinal section of an intrusive fluid pumping device according to some embodiments of the present application;

[0036] FIG2 is a front view schematic diagram of an intrusive fluid pumping device according to some embodiments of the present application;

[0037] FIG3 is a front view schematic diagram of a core portion of a support body according to some embodiments of the present application;

[0038] FIG4 is a schematic cross-sectional view at AA in FIG3 ;

[0039] FIG5 is a front view schematic diagram of a flexible element according to some embodiments of the present application;

[0040] FIG6 is a front view schematic diagram of a clamp according to some embodiments of the present application;

[0041] FIG7 is a side view of a clamp according to some embodiments of the present application;

[0042] FIG8 is a schematic diagram of the fluid flow direction inside an intrusive fluid pumping device according to some embodiments of the present application. DETAILED DESCRIPTION

[0043] The following description of exemplary embodiments of the present application is made in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0044] 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.

[0045] 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".

[0046] As described in the background technology section, the blood pumping catheter is a major component of the ventricular assist device, and its radial dimensions will determine the size of the wound caused to the patient during the interventional process. A smaller wound area can reduce the patient's pain. Existing optimization methods, such as reducing the radial dimensions of each component through conventional optimized structural design, and / or by setting part of the structure to be compressible and foldable, etc., cannot further reduce the radial dimensions of the blood pumping catheter. The main reason for this phenomenon is that the blood pumping catheter is integrated with a perfusion fluid channel, which makes it impossible for some components of the blood pumping catheter to be made into a foldable or compressible form. In addition, the diameter of the perfusion fluid channel cannot be reduced to reduce the overall size of the blood pumping catheter, otherwise the supply of sufficient perfusion fluid cannot be guaranteed.

[0047] In order to solve at least one of the above-mentioned problems encountered in the prior art, the present application provides an invasive fluid pumping device. The invasive fluid pumping device includes: a support body, wherein the proximal end of the support body is provided with at least one proximal channel penetrating the side wall of the support body, and the distal end of the support body is provided with at least one distal channel penetrating the side wall of the support body; an expandable structure, which is provided on the outer surface of the side wall of the support body and covers the proximal channel and the distal channel; wherein, the expandable structure will move away from the outer surface of the support body in a pressurized state to establish a fluid channel between the inner surface of the expandable structure and the outer surface of the side wall of the support body, and the fluid channel is connected to the proximal channel and the distal channel respectively; and the expandable structure will at least partially abut the outer surface of the side wall of the support body in an unpressurized state.

[0048] The invasive fluid pumping device is used to pump fluid at a target location to assist in the delivery of the fluid. For example, the fluid pumping device can be a blood pumping catheter that can pump blood from the heart into blood vessels to provide hemodynamic support. In the embodiments shown in Figures 1, 2 and 4, the invasive fluid pumping device includes a support body 105 located in the middle. The support body 105 preferably has a cylindrical outer contour to facilitate the interventional operation of the instrument. The interior of the support body 105 includes a hollow cavity to accommodate the corresponding components. The proximal end of the support body 105 is provided with at least one proximal channel 401 that passes through the side wall of the support body 105, and the distal end of the support body 105 is provided with at least one distal channel 402 that passes through the side wall of the support body 105. The proximal end and distal end are both relative to the operator, wherein the end of the fluid pumping device or each component therein that is close to the operator is the proximal end, and the end that is away from the operator is the distal end.

[0049] The proximal channel 401 and the distal channel 402 can be provided in a plurality and distributed in any manner along the circumference of the support body 105. Preferably, the proximal channel 401 and the distal channel 402 extend radially along the support body 105 and are evenly distributed along the circumference of the support body 105, thereby ensuring that the perfusion fluid enters and exits the support body 105 evenly. Furthermore, the fluid pumping device also includes an expandable structure 106. The expandable structure 106 includes a flexible element. The flexible element is sleeved onto the outer surface of the side wall of the support body 105.

[0050] In some embodiments, the flexible element may be a soft film or a thin film, etc. In some embodiments, the flexible element may be a heat shrink tube or a TPU film, etc. In some other embodiments, the flexible element may be pre-processed into the same geometric shape as the device to be sleeved. Of course, the initial form of the flexible element may also be a hollow cylinder, and after sleeved, it may be attached to the surface of the device to be sleeved through a back-end process. For example, when the flexible element is a hollow cylindrical heat shrink tube, it may be shrunk and attached to the surface of the device by heating after the sleeve is completed.

[0051] After the flexible element is placed over the outer surface of the support body 105, the inner surface of the flexible element abuts against the surface of the support body 105 and covers the ports of the proximal channel 401 and distal channel 402. Therefore, when pressure is applied to the expandable structure 106, for example, when perfusion fluid is injected into the proximal channel 401 of the support body 105 through the perfusion channel, the expandable structure 106 gradually expands and moves away from the outer surface of the support body 105, thereby establishing a fluid channel between the inner surface of the flexible element and the outer surface of the sidewall of the support body 105. The fluid channel is then connected to the proximal channel 401 and the distal channel 402, respectively. At this point, the perfusion fluid sequentially passes through the proximal channel 401 and the fluid channel before reaching the distal channel 402. Furthermore, when the pressure applied to the expandable structure 106 is removed, the flexible element gradually contracts, causing the fluid in the fluid channel to be discharged until the expandable structure 106 abuts against the outer surface of the sidewall of the support body 105.

[0052] The wall thickness of the expandable structure 106 is in the range of 0.01mm to 0.5mm. It is understandable that a thicker expandable structure 106 can improve the strength of the pumping device, but is not conducive to reducing the radial dimension of the pumping device, while a thinner wall thickness cannot ensure that the pumping device can withstand the infusion pressure, posing a safety hazard. After comprehensively considering the above factors, some embodiments of the present application select the wall thickness of the expandable structure 106 to be between 0.01mm and 0.5mm (including the endpoint values). For example, the heat shrink tube film structure mentioned above can be a heat shrink tube with a thickness of 0.2mm. For example, the TPU film mentioned above has a thickness of, for example, 0.01mm, 0.04mm, or 0.08mm.

[0053] In other embodiments, the expandable structure 106 comprises an elastomeric structure. Here, the elastomeric structure is made of a material that deforms significantly when pulled, allowing it to deform under external force and recover after the force is removed. It is understood that the expandable structure 106 can be entirely elastomeric, or it can be at least partially elastomeric. Depending on the material of the expandable structure 106, its ability to recover from deformation varies. When its elasticity is high, the expandable structure 106 can expel most or almost all of the fluid in the fluid channel and ultimately abut against the outer surface of the support body 105. When the expandable structure 106 has low elasticity, some perfusate may remain in the fluid channel after the pressure is removed, causing the expandable structure 106 to partially abut against the surface of the support body 105. For example, the expandable structure 106 can be entirely constructed of an elastic rubber layer. Furthermore, its wall thickness can be, for example, 0.4 mm.

[0054] As can be seen from the above description, in this embodiment, the fluid channels are temporarily established, effectively utilizing the expansion and contraction properties of the expandable structure 106. This allows the fluid pumping device to initially have a radial dimension only slightly larger than the diameter of the support body 105. This solution eliminates the need to pre-machine all the perfusate inflow channels within the fluid device. In other words, there is no need to physically reserve a solid portion of the support body 105 for these channels. This reduces the radial dimension of the support body 105, thereby reducing the overall size of the pumping device. When the fluid pumping device is to intervene in a target environment, prior to reaching the target location, perfusate can be withheld from the support body 105. The expandable structure 106 can rest against the surface of the support body, maintaining the fluid pumping device at its minimum radial dimension and minimizing the invasive area of ​​the interventional procedure. Upon reaching the target location, perfusate can be supplied to the support body 105, causing the expandable structure 106 to expand and establish a perfusate flow path.

[0055] In this embodiment, an inflow channel 113 is provided in the support body 105. The inflow channel 113 extends from the proximal end of the support body 105 to the proximal channel 401, and the inflow channel 113 is in communication with the proximal channel 401. In the embodiment shown in FIG1 , at least one inflow channel 113 is provided axially on the support body 105. The distal end of the inflow channel 113 is in communication with the proximal channel 401, and the proximal end of the inflow channel 113 is in communication with an external perfusion fluid inflow channel, so that external perfusion fluid is introduced into the fluid channel through the proximal channel 401.

[0056] In this embodiment, an outflow channel 112 is provided in the support body 105. The outflow channel 112 extends from the distal channel 402 to the distal end of the support body 105, and the outflow channel 112 is in communication with the distal channel 402. In the embodiment shown in FIG1 , at least one outflow channel 112 is provided axially on the support body 105, and the proximal end of the outflow channel 112 is in communication with the distal channel 402, so that the perfusion fluid in the fluid channel passes through the distal channel 402 and the outflow channel 112 in sequence before entering the target environment.

[0057] As can be seen from the above description, the inflow channel 113 and outflow channel 112 of the present application are arranged in segments rather than forming a continuous fluid passage. Therefore, it is not necessary to have a large diameter for the support body 105 to form a continuous fluid passage. Therefore, the segmented fluid passage can fully utilize the space within the support body 105, effectively reducing the radial size of the fluid pumping device.

[0058] In this embodiment, a waste liquid channel is provided within the support body 105. The waste liquid channel extends from the distal channel 402 to the proximal end of the support body 105 and is connected to the distal channel 402. The waste liquid channel is isolated from the inflow channel 113. Referring to the embodiment shown in FIG8 , the arrows flowing in the distal direction illustrate the flow of perfusate into the support body 105, while the arrows flowing in the proximal direction within the support body 105 reflect the flow of waste perfusate out of the support body 105. The channel indicated by the arrows flowing in the proximal direction is the waste liquid channel, which is isolated from the inflow channel 113. The distal end of the waste liquid channel is connected to the distal channel 402 to allow a portion of the perfusate to be introduced into the waste liquid channel. This portion of the perfusate then passes through the waste liquid channel within the support body 105 and enters the waste liquid discharge channel for discharge to the target environment.

[0059] In this embodiment, the support body 105 is internally provided with a bearing. A portion of the perfusion fluid at the outlet of the distal channel 402 is diverted and flushes the friction pair of the bearing, then enters the waste fluid channel and the waste fluid discharge channel in sequence. In the embodiment shown in FIG1 , a first bearing 107 and a second bearing 108 are mounted within the hollow cavity of the support body 105. These two bearings are used to support the rotating shaft 104. An impeller unit is provided at the distal end of the rotating shaft 104. Under the action of a driving load, the rotating shaft 104 drives the impeller unit to rotate, drawing fluid from the distal end into the fluid pumping device, which is then discharged into the target blood vessel through the discharge port.

[0060] However, the above-mentioned rotation process will cause the friction pair of the bearing to heat up and even generate wear particles. The heat and wear particles can damage blood or tissue. To this end, in one embodiment of the present application, the proximal channel 401 is connected to the inflow channel 113 to introduce the perfusion liquid into the support body 105. Referring specifically to the example shown in Figure 8, the perfusion liquid enters the support body 105 through the proximal perfusion liquid inflow channel 113 and flows along the proximal channel 401 toward the expandable structure 106. The inflow channel 113 is formed between the bushing 111 and the tail cover 109.

[0061] In the present application, the support body 105 includes the tail cover 109, which is located in the proximal direction of the support body 105 and is detachably connected to the core part of the support body 105. As shown in Figure 1, the distal end of the bushing 111 abuts against the proximal end surface of the second bearing 108 and the inner surface of the hollow cavity of the support body 105. The distal end of the tail cover 109 abuts against the proximal end surface of the core part of the support body 105. The interior of the tail cover 109 has a hollow portion to accommodate the bushing 111, and the bushing 111 and the tail cover 109 are clearance-fitted to form the perfusion liquid inflow channel 113. The bushing 111 isolates the perfusion liquid inflow channel 113 from the internal cavity of the support body 105.

[0062] In some other embodiments, a sealing cover 102 is further provided between the tail cover 109 and the core portion of the support body 105 , and the sealing cover 102 is used to seal the gap between the tail cover 109 and the core portion of the support body 105 .

[0063] As shown in FIG8 , after the perfusate passes through the proximal channel 401, the fluid channel, and the distal channel 402, it flows toward the rotating shaft 104 and is split at the surface of the rotating shaft 104. Part of the split perfusate enters the gap between the support body 105 and the rotating shaft 104 (i.e., enters the outflow channel 112), flows distally, and then enters the target environment. Part of the split perfusate enters the gap between the rotating shaft 104 and the support body 105 (i.e., enters the waste channel) and flows proximally.

[0064] The portion of fluid that enters the outflow channel 112 is mainly used to prevent the target fluid from entering the fluid pumping device, for example, to prevent blood from entering the fluid pumping device and affecting the normal operation of the fluid pumping device.

[0065] Because the bearing is partially disposed within the waste fluid channel, some of the fluid entering the waste fluid channel can flush the bearing's friction pair. This not only removes heat generated by the friction pair but also flushes away wear particles, preventing these heat from impacting patient safety and the proper functioning of the fluid pumping device, and preventing wear particles from entering the target environment. The flushed waste fluid then enters the waste fluid discharge channel and ultimately flows out of the target environment.

[0066] In this embodiment, in the direction from the distal end to the proximal end, the support body 105 includes a distal section, a middle section and a tail cover 109 (which is located at the proximal end of the support body 105), wherein the radial dimension of the middle section is larger than the radial dimension of the distal section, and the radial dimension of the middle section is also larger than the radial dimension of the tail cover 109.

[0067] The distal end of the expandable structure 106 is sealedly connected to the outer wall of the distal section of the support body 105, and / or the proximal end of the expandable structure 106 is sealedly connected to the outer wall of the tail cap 109 of the support body 105. In the embodiment shown in Figures 1 to 4, the support body 105 includes a middle section with a larger diameter, a distal section with a smaller diameter, and a tail cap 109. Step-like geometric profiles are formed between the middle section and the distal section, and between the middle section and the tail cap 109. The distal end of the expandable structure 106 is sealedly connected to the outer wall of the distal section, and the proximal end of the expandable structure 106 is sealedly connected to the outer wall of the tail cap 109.

[0068] In the present embodiment, the proximal channel 401 and the distal channel 402 are both located in the middle section. In other embodiments, the proximal channel 401 may be located on the tail cover 109, and / or the distal channel 402 may be located in the distal section. It is understandable that, since the size of the connection between the expandable structure 106 and the support body 105 will affect the radial size of the fluid pumping device as a whole, it is particularly important to avoid increasing or decreasing the radial size at the connection. To this end, in this embodiment, the connection is arranged on the distal section and the tail cover 109 with a smaller diameter, thereby eliminating the influence of the size of the connection on the radial size of the fluid pumping device. Furthermore, the expandable structure 106 is sealed and connected to the distal section and the tail cover 109 respectively, which can prevent the perfusion fluid from leaking into the target environment, thereby improving the safety and reliability of the device.

[0069] In other embodiments, the proximal channel 401 and the distal channel 402 are both located on the midsection, and the distal end of the expandable structure 106 is sealedly connected to the distal surface of the midsection, while the proximal end of the expandable structure 106 is sealedly connected to the proximal surface of the midsection. It will be appreciated that connecting the distal and proximal ends of the expandable structure 106 to the midsection can reduce the amount of expandable structure 106 used, ease the difficulty of installing the expandable structure 106, and reduce manufacturing costs.

[0070] Furthermore, because the present application utilizes expandable structure 106 to establish a temporary fluid channel, the midsection is kept smaller. Therefore, in applications in which radial dimension is not sensitive, the distal and proximal ends of expandable structure 106 can be connected to the end faces of the midsection. Compared to prior art solutions that construct all fluid channels within support body 105, the connection method of expandable structure 106 in this embodiment still enables the maximum radial dimension of the fluid pumping device to be smaller than that of the prior art.

[0071] It should be noted that, in other embodiments, the radial dimensions of the distal end, the middle section, and the tail cover 109 may also be consistent.

[0072] In some optional embodiments, the distal end of the expandable structure 106 is sealedly connected to the distal end of the support body 105 by at least one of bonding or welding; and / or the proximal end of the expandable structure 106 is sealedly connected to the tail cover 109 by at least one of bonding or welding. Whether the distal and proximal ends of the expandable structure 106 are securely connected and sufficiently sealed is an important prerequisite for ensuring the reliability and stable operation of the fluid pumping device. To this end, in some embodiments of the present application, it is stably and sealedly connected to the support body 105 by bonding or welding.

[0073] In some optional embodiments, the fluid pumping device further comprises a first clamp 110, which is sleeved onto the proximal outer wall of the expandable structure 106 to compress the expandable structure 106 against the outer wall of the tail cap 109. It is understood that if the perfusate repeatedly impacts the inner surface of the flexible element, the fluid impact force and pressure fluctuations will force the connection portion of the expandable structure 106 to separate, affecting the reliability of the fluid pumping device. In the embodiment shown in FIG1 , when the first clamp 110 is sleeved onto the tail cap 109, the inner diameter of the first clamp 110 is slightly larger than or equal to the outer diameter of the tail cap 109, forming a dimensional constraint that enables the first clamp 110 to stably apply a compressive force to the proximal end of the expandable structure 106, forcing the proximal end of the expandable structure 106 to be stably sealed against the outer surface of the tail cap 109.

[0074] In some optional embodiments, the first clamp 110 includes a notch 601 that axially penetrates the side wall of the first clamp 110. In the assembled state, the two side surfaces of the notch 601 are welded to press the flexible element against the outer wall of the tail cover 109.

[0075] In the embodiment shown in Figures 6 and 7, the first clamp 110 has a notch 601, which extends from the proximal end face of the first clamp 110 to the distal end face of the first clamp 110 along the axial direction, thereby giving the first clamp 110 a generally C-shaped cross-section. The notch 601 provides the first clamp 110 with a certain degree of flexibility, and its diameter can be increased or decreased under the action of external force. When the first clamp 110 needs to be mounted on the tail cover 109, an external force can be applied to the first clamp 110 to force its diameter to increase appropriately to facilitate its mounting. After the mounting operation is completed, the shape of the first clamp 110 can be adjusted so that the surfaces on both sides of the notch 601 are aligned, and then the surfaces on both sides of the notch 601 can be welded together using a welding process. During the welding process, the first clamp 110 can be appropriately contracted to reduce the width of the slot 601 , thereby increasing the clamping force of the first clamp 110 on the flexible element, so that the proximal end of the expandable structure 106 is stably connected to the tail cover 109 .

[0076] In some optional embodiments, the fluid pumping device further includes a bracket 103; the bracket 103 includes a first connecting portion, and the distal end of the support body 105 includes a second connecting portion, wherein the first connecting portion and the second connecting portion cooperate to connect to each other so that the bracket 103 is sleeved on the distal end of the support body 105. Furthermore, one of the first connecting portion and the second connecting portion includes a slot, and the other includes a buckle, and the slot and the buckle are engaged.

[0077] In the embodiment shown in Figures 1 to 4, a bracket 103 is provided at the distal end of the fluid pumping device. The bracket 103 has a compressible and foldable form. For example, the bracket 103 has a mesh structure. The mesh structure enables the bracket 103 to be in a contracted and folded state during the intervention process, thereby maintaining a smaller radial size; after reaching the target position, the bracket 103 is unfolded again. Furthermore, the rotating shaft 104 and the impeller unit located at the distal end of the rotating shaft 104 are both arranged inside the bracket 103. The impeller unit draws the fluid from the distal end into the bracket 103, and then makes it flow out from the side wall outlet at the proximal end of the bracket 103, thereby achieving an auxiliary transport effect on the fluid.

[0078] In the embodiment shown in Figure 1, in order to avoid the radial dimension of the bracket 103 being too large after being connected to the support body 105, the proximal end of the bracket 103 can be fixedly connected to the distal end of the support body 105. The bracket 103 is provided with a first connecting portion, such as a slot, and the number of the slots can be 1, 2, or more. Correspondingly, the distal end of the support body 105 is provided with a second connecting portion connected to the first connecting portion, for example, the second connecting portion can be a buckle 101. The number of the buckles matches the number of the slots. During assembly, the bracket 103 is first sleeved on the distal end of the support body 105, and then the diameter, angle and circumferential position of the bracket 103 are adjusted so that the first connecting portion is connected in coordination with the second connecting portion. After assembly is completed, the bracket 103 presses the distal end of the expandable structure 105 against the outer wall of the distal end of the support body 105.

[0079] It is understandable that, in some optional embodiments, the above-mentioned connection method cannot ensure the stability of the connection of the bracket 103. To this end, in some optional embodiments, the first connecting portion and the second connecting portion are welded to each other, so that the bracket 103 and the support body 105 are non-detachable. Of course, in other embodiments, the fluid pumping device also includes a second clamp (not shown in the figure), which is sleeved on the outside of the bracket 103, and the position of the second clamp corresponds to the position of the expandable structure 106. The second clamp presses the expandable structure 106 against the outer wall of the support body 105. The second clamp can not only restrain the radial deformation of the bracket, especially when the bracket 103 and the support body 105 adopt a buckle and slot connection method, the second clamp can effectively restrain the axial displacement between the buckle and the slot, so that the bracket 103 is stably connected to the distal end of the support body 105. More advantageously, when a second clamp with a suitable inner diameter is selected, the radial dimension of the second clamp enables the second clamp to apply radial compression to the bracket 103 , thereby firmly pressing the distal end of the flexible element against the outer wall of the support body 105 .

[0080] It is understandable that, in some embodiments, the second clamp may adopt the same geometric structure and assembly method as the first clamp.

[0081] The above specific embodiments do not constitute a limitation on the scope of protection of this application. 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.

[0082] 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. An intrusive fluid pumping device, wherein: include: A support body, wherein the proximal end of the support body is provided with at least one proximal channel penetrating through the side wall of the support body, and the distal end of the support body is provided with at least one distal channel penetrating through the side wall of the support body; An expandable structure, disposed on the outer surface of the side wall of the support body and covering the proximal channel and the distal channel; Wherein, the expandable structure is away from the outer surface of the supporting body under pressurized state so as to establish a fluid channel between the inner surface of the expandable structure and the outer surface of the side wall of the supporting body, and the fluid channel is connected with the proximal channel and the distal channel respectively; the expandable structure will at least partially adhere to the outer surface of the side wall of the supporting body under unpressurized state.

2. The intrusive fluid pumping device according to claim 1, wherein: An inflow channel is provided in the support body, the inflow channel extends from the proximal position of the support body to the proximal channel position, and the inflow channel is communicated with the proximal channel; An outflow channel is provided in the support body, the outflow channel extends from the distal channel position to the distal position of the support body, and the outflow channel is communicated with the distal channel.

3. The intrusive fluid pumping device according to claim 2, wherein: A waste liquid channel is provided in the support body, and the waste liquid channel extends from the distal channel position to the proximal position of the support body, and the waste liquid channel is communicated with the distal channel, and the waste liquid channel is isolated from the inflow channel.

4. The intrusive fluid pumping device according to claim 1, wherein: The expandable structure includes a flexible element.

5. The intrusive fluid pumping device according to claim 4, wherein: The flexible element includes a thin film or a soft film.

6. The intrusive fluid pumping device according to claim 1, wherein: The expandable structure includes an elastomeric structure.

7. The intrusive fluid pumping device according to claim 1, wherein: The wall thickness of the expandable structure in a direction perpendicular to the fluid channel is in the range of 0.01 mm to 0.5 mm.

8. The intrusive fluid pumping device according to claim 1, wherein: In the direction from the distal end to the proximal end, the support body includes a distal section, a middle section and a tail cover, wherein the radial dimension of the middle section is larger than the radial dimension of the distal section, and the radial dimension of the middle section is larger than the radial dimension of the tail cover.

9. The intrusive fluid pumping device according to claim 8, wherein: The distal end of the expandable structure is sealed and connected to the outer wall of the distal end section of the support body; the proximal end of the expandable structure is sealed and connected to the outer wall of the tail cover of the support body.

10. The intrusive fluid pumping device according to claim 8, wherein: The proximal channel and the distal channel are both located on the middle section; the distal end of the expandable structure is sealed and connected to the distal surface of the middle section, and the proximal end of the expandable structure is sealed and connected to the proximal surface of the middle section.

11. The intrusive fluid pumping device according to claim 1, wherein: The fluid pumping device further comprises a first clamp, which is sleeved on the proximal outer wall of the expandable structure to press the expandable structure tightly against the outer wall of the supporting body.

12. The intrusive fluid pumping device according to claim 11, wherein: The first clamp comprises a notch, and the notch penetrates the side wall of the first clamp along the axial direction.

13. The intrusive fluid pumping device according to claim 1, characterized in that: The fluid pumping device further comprises a bracket, the bracket is radially expandable and foldable, and the radial dimension of the bracket in the folded state is smaller than the radial dimension of the support body; The bracket includes a first connection part, and the distal end of the support body includes a second connection part. The first connection part and the second connection part are matched and connected to set the bracket at the distal end of the support body.

14. The intrusive fluid pumping device according to claim 13, wherein: One of the first connecting part and the second connecting part includes a slot, and the other includes a buckle, and the slot and the buckle are snap-connected.

15. The intrusive fluid pumping device according to claim 13, wherein: The support is also sleeved on the outer wall of the expandable structure.

16. The intrusive fluid pumping device according to claim 13, wherein: The fluid pumping device further comprises a second clamp, which is sleeved on the outside of the bracket, and the position of the second clamp corresponds to the position of the expandable structure.

Images