Interventional fluid pumping device

Abstract

The invention provides an intrusive fluid pumping device which comprises a supporting body, the near end of the supporting body is provided with at least one near-end channel penetrating through the side wall of the supporting body, and the far end of the supporting body is provided with at least one far-end channel penetrating through the side wall of the supporting body; the expandable structure is arranged on the outer surface of the side wall of the supporting main body and covers the near-end channel and the far-end channel; wherein the expandable structure is far away from the outer surface of the support 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 support main body, and the fluid channel is respectively communicated with the near-end channel and the far-end channel; the expandable structure will at least partially abut against the outer surface of the side wall of the support body in an unpressurized state. According to the fluid pumping device, the expansion and contraction characteristics of the expandable structure are utilized to establish a temporary perfusate channel, and all perfusate flowing-in channels do not need to be machined in the fluid device in advance, so that the size of the fluid pumping device is further reduced.

Description

Technical Field

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

[0002] In the prior art, the ventricular assist device provides patients with stable blood delivery support, reduces the burden on the heart, and reduces the risk of patients during surgery, which is beneficial to the patient's postoperative recovery. The main component of the ventricular assist device is the blood pumping catheter. The smaller the intervention size of the blood pumping catheter, the smaller the wound caused to the patient, which can reduce the patient's pain. In order to achieve the purpose of reducing the intervention size of the blood pumping catheter, the relevant technology usually optimizes the structural design to reduce the radial size of the device, and / or sets part of the structure to a compressible and foldable form. However, since the inflow and outflow channels of the perfusion fluid need to be set in the blood pumping catheter, the radial size of the blood pumping catheter cannot be further reduced. Furthermore, since the perfusion fluid channel is integrated in the blood pumping catheter, some components of the blood pumping catheter cannot be made into a foldable or compressible form. Therefore, the prior art has encountered a bottleneck in how to further reduce the radial size of the blood pumping catheter. Summary of the invention

[0003] In order to overcome at least one of the problems in the related art, the present invention provides an intrusive fluid pumping device.

[0004] Wherein, the interventional fluid pumping device comprises:

[0005] 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;

[0006] 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;

[0007] 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.

[0008] In some optional embodiments, 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;

[0009] 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.

[0010] In some optional embodiments, 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 connected to the distal channel, and the waste liquid channel is isolated from the inflow channel.

[0011] In some optional embodiments, the expandable structure includes a flexible element.

[0012] In some optional embodiments, the flexible element includes a thin film or a soft membrane.

[0013] In some optional embodiments, the expandable structure includes an elastomeric structure.

[0014] In some optional embodiments, the thickness of the expandable structure in a direction perpendicular to the fluid channel is in a range of 0.01 mm to 0.5 mm.

[0015] In some optional embodiments, the support body includes a distal section, a middle section and a tail cover, wherein the radial dimension of the middle section is greater than the radial dimensions of the distal section and the tail cover;

[0016] 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.

[0017] In some optional embodiments, the fluid pumping device further comprises a first clamp, wherein the first clamp is sleeved on the proximal outer wall of the expandable structure to press the expandable structure against the outer wall of the support body.

[0018] In some optional embodiments, the first clamp includes a notch, and the notch penetrates the side wall of the first clamp along the axial direction.

[0019] In some optional embodiments, 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;

[0020] 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.

[0021] In some optional embodiments, 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.

[0022] In some optional embodiments, the stent is also sleeved on the outer wall of the expandable structure.

[0023] In some optional embodiments, 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.

[0024] The technical solution of the present invention has the following advantages or beneficial effects:

[0025] (1) The present invention uses an expandable structure to temporarily establish part of the fluid channel for the perfusion liquid to enter the support body, 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 prior art, the present invention does not need to pre-process all the perfusion liquid inflow channels in the fluid device, that is, it is not necessary to reserve a solid body on the support body to process all the perfusion liquid inflow channels, 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 human body, before reaching the target position, the perfusion liquid is not injected into the support body, and the expandable structure is attached to 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 interventional operation to the patient.

[0026] (2) The present invention arranges the connection between the proximal and distal ends of the expandable structure at the distal and proximal ends of the support body 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 is sealedly connected to the proximal and distal ends of the support body, which can avoid the problem of perfusion fluid leaking into the target environment, thereby improving the safety and reliability of the device.

[0027] (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. When a clamp is sleeved on the outside of the expandable structure, the problem of separation of the expandable structure can be avoided, the connection strength of the expandable structure is further improved, and the reliability of the fluid pumping device is enhanced.

[0028] (4) The present invention 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 and is used to flush the friction pair to remove the heat generated by the friction pair, and at the same time flush 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0030] Figure 1 is a schematic diagram of a longitudinal section of an interventional fluid pumping device according to an embodiment of the present invention;

[0031] Figure 2 is a front view schematic diagram of an intrusive fluid pumping device according to an embodiment of the present invention;

[0032] Figure 3 is a front view schematic diagram of a core part of a supporting body according to an embodiment of the present invention;

[0033] Figure 4 yes Figure 3 A-A section diagram;

[0034] Figure 5 is a front view schematic diagram of a flexible element according to an embodiment of the present invention;

[0035] Figure 6 is a front view schematic diagram of a clamp according to an embodiment of the present invention;

[0036] Figure 7 is a side view schematic diagram of a clamp according to an embodiment of the present invention;

[0037] Figure 8 Schematic diagram of the fluid flow direction inside the interventional fluid pumping device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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".

[0041] 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. Conventional optimization of structural design to reduce the radial dimensions of each component, and / or setting some structures to be compressible and foldable, 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.

[0042] In order to solve at least one of the above problems encountered in the prior art, the present invention provides an interventional fluid pumping device. The interventional fluid pumping device comprises: a support body, 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 is provided on the outer surface of the side wall of the support body and covers the proximal channel and the distal channel; 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 with the proximal channel and the distal channel respectively; the expandable structure will at least partially abut the outer surface of the side wall of the support body in an unpressurized state.

[0043] 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 may be a blood pumping catheter, which can pump blood from the heart to the blood vessels to provide hemodynamic support. Figure 1 , Figure 2 and Figure 4In the illustrated embodiment, the interventional fluid pumping device includes a support body 105 located in the middle. The support body preferably has a cylindrical outer profile to facilitate the interventional operation of the instrument. The interior of the support body includes a hollow cavity to accommodate the corresponding elements. The proximal end of the support body is provided with at least one proximal channel 401 penetrating the side wall of the support body, and the distal end of the support body is provided with at least one distal channel 402 penetrating the side wall of the support body. The proximal end and the distal end are both relative to the operator, wherein the end of the fluid pumping device or each element therein close to the operator is the proximal end, and the end away from the operator is the distal end. The proximal channel and the distal channel can be set to multiple, and can be distributed in the circumferential direction of the support body in any manner. Preferably, the proximal channel and the distal channel extend along the radial direction of the support body and are evenly distributed in the circumferential direction of the support body, so that the perfusion fluid enters and flows out of the support body evenly. Further, the fluid pumping device also includes an expandable structure 106. The expandable structure includes a flexible element. The flexible element is sleeved on the outer surface of the side wall of the supporting body.

[0044] In some embodiments, the flexible element may be a soft film or a 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 to have the same geometric shape as the device to be sleeved. Of course, the initial form of the flexible element may also be a hollow cylindrical shape, and after the sleeve is set, it may be attached to the surface of the device to be sleeved through the 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. When the flexible element is sleeved on the outer surface of the support body, the inner surface of the flexible element is attached to the surface of the support body and covers the ports of the proximal channel and the distal channel. Therefore, when pressure is applied to the expandable structure, for example, when the perfusion liquid is poured into the proximal channel of the support body through the perfusion channel, the expandable structure will gradually expand and move away from the outer surface of the support body, thereby establishing a fluid channel between the inner surface of the flexible element 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. At this time, the perfusion fluid will sequentially pass through the proximal channel and the fluid channel before reaching the distal channel. Further, when the pressure applied to the expandable structure is removed, the flexible element will gradually shrink and discharge the fluid in the fluid channel until the expandable structure is attached to the outer surface of the side wall of the support body.

[0045] The thickness of the expandable structure is in the range of 0.01mm to 0.5mm. It is understandable that a thicker expandable structure can improve the strength of the pumping device, but is not conducive to reducing the radial dimension of the pumping device, while a thinner thickness cannot ensure that the pumping device can withstand the injection pressure, posing a safety hazard. After comprehensively considering the above factors, some embodiments of the present invention select the thickness of the expandable structure 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.

[0046] In other embodiments, the expandable structure includes an elastomeric structure, wherein the elastomeric structure material is a structure that is greatly deformed after being pulled, so that it can be deformed under the action of an external force and recover the deformation after the external force is removed. It is understandable that the expandable structure can be entirely an elastomeric structure, and the expandable structure can also include at least a portion of the elastomeric structure. Depending on the material of the expandable structure, its ability to recover deformation is also different. When its elasticity is relatively large, the expandable structure can discharge most or almost all of the fluid in the fluid channel and eventually abut against the outer surface of the support body. When the elasticity of the expandable structure is relatively poor, after the pressure is removed, some of the perfusion fluid will remain in the fluid channel, causing the expandable structure to partially abut against the surface of the support body. The expandable structure is, for example, an elastic rubber layer structure as a whole. Further, its thickness is, for example, 0.4 mm.

[0047] It can be seen from the above description that in this embodiment, the fluid channel is temporarily established, which effectively utilizes 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. In this scheme, it is not necessary to pre-process all the perfusion liquid inflow channels in the fluid device, that is, it is not necessary to reserve entities on the support body to process all the perfusion liquid inflow channels, 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 human body, before reaching the target position, the perfusion liquid is not injected into the support body, and the expandable structure is attached to the surface of the support body so that the fluid pumping device maintains the minimum radial size state, thereby reducing the trauma area of ​​the intervention operation to the patient. When reaching the target position, the perfusion liquid can be supplied to the support body to expand the expandable structure and establish a path for the perfusion liquid to circulate.

[0048] In this embodiment, 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. Figure 1 In the illustrated embodiment, at least one inflow channel 113 is axially arranged on the support body, the distal end of the inflow channel is connected with the proximal channel, and the proximal end of the inflow channel is connected with the external perfusion liquid inflow channel so as to introduce the external perfusion liquid into the fluid channel between the inner surface of the expandable structure and the outer surface of the support body through the proximal channel.

[0049] In this embodiment, 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. Figure 1 In the embodiment shown, at least one outflow channel 112 is arranged on the support body along the axial direction, and the proximal end of the outflow channel is connected to the distal channel, so that the perfusion liquid in the fluid channel passes through the distal channel and the outflow channel in sequence and enters the target environment. From the above description, it can be seen that the inflow channel and the outflow channel in the present invention are arranged in sections, rather than constructing a continuous fluid passage, so there is no need for the support body to have a large diameter to process a continuous fluid passage. Therefore, on the contrary, the segmented fluid passage can make full use of the space in the support body and effectively reduce the radial size of the fluid pumping device.

[0050] In this embodiment, 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 connected to the distal channel, and the waste liquid channel is isolated from the inflow channel. Figure 8 In the embodiment shown, the red arrow (arrow flow in the distal direction) shows the flow direction of the perfusion liquid into the support body, and the blue arrow (arrow flow in the proximal direction in the support body) reflects the flow direction of the perfusion waste liquid out of the support body. The channel where the blue arrow is located is the waste liquid channel, which is isolated from the inflow channel. The distal end of the waste liquid channel is connected to the distal channel to introduce part of the perfusion liquid into the waste liquid channel, and the part of the perfusion liquid enters the waste liquid discharge channel after passing through the waste liquid channel located in the support body and is discharged from the human body.

[0051] In this embodiment, a bearing is provided inside the support body, and the perfusion liquid part passing through the outlet of the distal channel is diverted to flush the friction pair of the bearing, and then enters the waste liquid channel and the waste liquid discharge channel in sequence. Figure 1In the illustrated embodiment, a first bearing 107 and a second bearing 108 are installed in the hollow cavity of the support body, and the two bearings are used to support the rotating shaft 104. An impeller unit is provided at the distal end of the rotating shaft. Under the action of the driving load, the rotating shaft will drive the impeller unit to rotate to draw the fluid from the distal end into the fluid pumping device, and then discharge it into the target blood vessel through the discharge port. 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 will cause damage to the blood or tissue. To this end, in one embodiment of the present invention, the proximal channel 401 is connected to the inflow channel to introduce the perfusion fluid into the support body. For details, see Figure 8 In the example shown, the perfusion liquid enters the support body through the proximal perfusion liquid inflow channel and flows along the proximal channel 401 toward the expandable structure. The inflow channel is formed between the bushing 111 and the tail cover 109.

[0052] In the present invention, the support body includes the tail cover, which is located at the proximal end of the support body, and the tail cover is detachably connected to the core part of the support body. Figure 1 As shown, the distal end of the bushing abuts against the proximal end surface of the second bearing 108 and the inner surface of the hollow cavity of the support body. The distal end of the tail cover abuts against the proximal end surface of the core part of the support body. The interior of the tail cover has a hollow portion to accommodate the bushing, and the clearance between the bushing and the tail cover is matched to form the perfusion liquid inflow channel. The bushing isolates the perfusion liquid inflow channel from the internal cavity of the support body. In some other embodiments, a sealing cover 102 is further provided between the tail cover and the core part of the support body, and the sealing cover is used to seal the gap between the tail cover and the core part of the support body. Figure 8 As shown, after the perfusion liquid passes through the proximal channel 401, the fluid channel between the expandable structure and the outer surface of the support body, and the distal channel 402, it flows toward the direction of the rotating shaft 104. And it is diverted at the surface of the rotating shaft, wherein part of the diverted perfusion liquid enters the gap between the support body and the rotating shaft (i.e., enters the outflow channel), and flows to the distal end and then enters the target environment. This part of the fluid is mainly used to prevent the target fluid from entering the fluid pumping device. For example, it prevents blood from entering the fluid pumping device and affecting the normal operation of the fluid pumping device. Figure 8As shown by the blue arrow in the figure (direction pointing to the proximal end), the partially diverted perfusion fluid enters the gap between the rotating shaft and the supporting body (i.e., enters the waste liquid channel) and flows toward the proximal end. Since the bearing is partially arranged in the waste liquid channel, the perfusion fluid can flush the friction pair of the bearing. The perfusion fluid used to flush the friction pair not only takes away the heat generated by the friction pair, but also flushes the wear particles, preventing the heat from affecting the safety of the human body and the normal operation of the fluid pumping device, and also preventing the wear particles from entering the human body. The flushed waste liquid enters the waste liquid discharge channel and eventually flows out of the human body.

[0053] In this embodiment, the support body includes a distal section, a middle section and a tail cover (which is located at the proximal end of the support body), wherein the radial dimension of the middle section is larger than the radial dimensions of the distal section and the tail cover. The distal end of the expandable structure is sealedly connected to the outer wall of the distal section of the support body; and / or the proximal end of the expandable structure is sealedly connected to the outer wall of the tail cover of the support body. Figures 1 to 4 In the embodiment shown, the support body includes a middle section with a larger diameter and a distal section and a tail cover with a smaller diameter, and a stepped geometric profile is formed between the middle section and the distal section and between the middle section and the tail cover. The distal end of the expandable structure is sealed and connected to the outer wall of the distal section, and the proximal end of the expandable structure is sealed and connected to the outer wall of the tail cover. In this embodiment, the proximal channel and the distal channel are both located in the middle section. In other embodiments, the proximal channel can be located on the tail cover, and / or the distal channel can be located in the distal section. It can be understood that since the size of the connection between the expandable structure and the support body will affect the radial size of the fluid pumping device as a whole, how to not increase or reduce the radial size at the connection is particularly important for the radial size of the fluid pumping device. For this reason, in this embodiment, the connection is set on the distal section and the tail cover with a smaller diameter, thereby eliminating the influence of the size of the connection on the radial size of the fluid pumping device. Further, the expandable structure is sealed and connected to the distal section and the tail cover respectively, which can prevent the perfusion fluid from leaking into the target environment, thereby improving the safety and reliability of the device.

[0054] In other embodiments, 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. It is understandable that connecting the distal and proximal ends of the expandable structure to the middle section can reduce the usage of the expandable structure, reduce the difficulty of installing the expandable structure, and reduce the manufacturing cost. In addition, since the present invention uses an expandable structure to establish a temporary fluid channel, the size of the middle section is smaller. Therefore, in application scenarios that are not sensitive to radial dimensions, connecting the distal and proximal ends of the expandable structure to the two end surfaces of the middle section still does not increase the radial dimension at the connection. Compared with the solution in the prior art that all fluid channels are constructed in the supporting body, the maximum radial dimension of the fluid pumping device caused by the connection method of the expandable structure in this embodiment is still smaller than that of the prior art.

[0055] It should be noted that, in other embodiments, the radial dimensions of the distal end, the middle section and the tail cover may also be consistent.

[0056] In some optional embodiments, the distal end of the expandable structure is sealed to the distal end of the support body by at least one of bonding or welding; and / or the proximal end of the expandable structure is sealed to the tail cover by at least one of bonding or welding. Whether the distal and proximal ends of the expandable structure are firmly connected and have sufficient sealing 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 invention, it is stably and sealedly connected to the support body by bonding or welding.

[0057] In some optional embodiments, the fluid pumping device further comprises a first clamp 110, which is sleeved on the proximal outer wall of the expandable structure to press the expandable structure against the outer wall of the tail cover. It is understandable that if the perfusion fluid repeatedly impacts the inner surface of the flexible element, the fluid impact force and pressure fluctuation will force the connection part of the expandable structure to have a tendency to separate, threatening the reliability of the fluid pumping device. Figure 1 In the embodiment shown, when the first clamp is sleeved on the tail cover, the inner diameter of the first clamp is slightly larger than or equal to the outer diameter of the tail cover. The size constraint enables the first clamp to stably apply a squeezing force to the proximal end of the expandable structure, forcing the proximal end of the expandable structure to stably seal against the outer surface of the tail cover.

[0058] In some optional embodiments, the first clamp includes a notch, and the notch axially penetrates the side wall of the first clamp. In the assembled state, the notch is welded to press the flexible element against the outer wall of the tail cover. Figure 6 and 7In the embodiment, the first clamp has a notch 601, and the notch runs from the proximal end face of the first clamp to the distal end face of the first clamp along the axial direction, so that the first clamp has a substantially C-shaped cross section. The notch makes the first clamp have a certain flexibility, and its diameter can be enlarged or reduced under the action of external force. When it is necessary to sleeve the first clamp on the tail cover, an external force can be applied to the first clamp to force its diameter to increase appropriately to facilitate its sleeve. After the sleeve operation is completed, the shape of the first clamp can be adjusted so that the surfaces on both sides of the notch are aligned. Then, the surfaces on both sides of the notch can be welded together by a welding process. During the welding process, the first clamp can be appropriately shrunk to reduce the width of the notch, thereby increasing the clamping force of the first clamp on the flexible element, so that the proximal end of the expandable structure is stably connected to the tail cover.

[0059] In some optional embodiments, the fluid pumping device further comprises a bracket; the bracket comprises a first connection portion, the distal end of the support body comprises a second connection portion, the first connection portion and the second connection portion are cooperatively connected to sleeve the bracket on the distal end of the support body. Furthermore, one of the first connection portion and the second connection portion comprises a slot, and the other comprises a buckle, and the slot and the buckle are connected by a snap connection. Figures 1 to 4 In the illustrated embodiment, a bracket 103 is disposed at the distal end of the fluid pumping device. The bracket has a compressible and foldable shape, for example, the bracket has a mesh structure. The mesh structure allows the bracket to be in a contracted and folded state during the intervention process, thereby maintaining a smaller radial dimension; after reaching the target position, the bracket is unfolded again. Furthermore, the rotating shaft and the impeller unit located at the distal end of the rotating shaft are both disposed inside the bracket. The impeller unit draws the fluid from the distal end into the bracket, and then makes it flow out from the side wall outlet at the proximal end of the bracket, thereby achieving an auxiliary transport effect on the fluid. Figure 1In the embodiment shown, in order to avoid the radial dimension of the bracket being too large after being connected to the support body, the proximal end of the bracket is fixedly connected to the distal end of the support body. Among them, the bracket is provided with a first connection part, such as a slot, and the number of the slots can be 1, 2, or more. Correspondingly, the distal end of the support body is provided with a second connection part connected to the first connection part, for example, the second connection part can be a buckle 101. The number of buckles matches the number of the slots. During assembly, the bracket is first sleeved on the distal end of the support body, and then the diameter, angle and circumferential position of the bracket are adjusted so that the first connection part is connected with the second connection. After assembly, the bracket presses the distal end of the expandable structure against the outer wall of the distal end of the support body. It can be understood that the above connection method cannot ensure the stability of the bracket connection. To this end, in some optional embodiments, the first connection part and the second connection part are welded to each other, so that the bracket and the support body cannot be disassembled. Of course, in some other embodiments, the fluid pumping device further includes a second clamp (not shown in the figure), which is sleeved on the outside of the bracket, and the position of the second clamp corresponds to the position of the expandable structure. The second clamp presses the expandable structure against the outer wall of the support body. The second clamp can not only constrain the radial deformation of the bracket, but also effectively constrain the axial displacement between the buckle and the slot when the bracket and the support body are connected by a buckle and a slot, so that the bracket is stably connected to the distal end of the support body. More advantageously, when a second clamp with a suitable inner diameter is selected, the radial size of the second clamp can enable the second clamp to apply a radial clamping force to the bracket, thereby firmly pressing the distal end of the flexible element against the outer wall of the support body. It can be understood that in some embodiments, the second clamp can adopt the same geometric structure and assembly method as the first clamp.

[0060] 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.

[0061] 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. An interventional fluid pumping device, characterized in that: 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 interventional fluid pumping device according to claim 1, characterized in that: 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 interventional fluid pumping device according to claim 2, characterized in that: 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 interventional fluid pumping device according to claim 1, characterized in that: The expandable structure includes a flexible element.

5. The interventional fluid pumping device according to claim 4, characterized in that: The flexible element includes a thin film or a soft film.

6. The intrusive fluid pumping device according to claim 1, characterized in that: The expandable structure comprises an elastomeric structure.

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

8. The intrusive fluid pumping device according to claim 1, characterized in that: The support body comprises a distal section, a middle section and a tail cover, wherein the radial dimension of the middle section is larger than the radial dimensions of the distal section and the tail cover.

9. The intrusive fluid pumping device according to claim 8, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The support is also sleeved on the outer wall of the expandable structure.

16. The intrusive fluid pumping device according to claim 13, characterized in that: 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.

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