Introducer and catheter pump system
By using the design and insert connection of tear sections and transition sections in the inlet, the problem of insufficiency between the conduit and the inlet holder is solved, the connection strength and stability are improved, and the pump head is safe under high push force. Sex and use effect.
Patent Information
- Application Number
- CN202420631152.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The connection between the existing inlet guide conduit and the inlet handle is not firm enough and is easy to fall off under large pushing force, affecting the stability and safety of the pump head.
The pipe body design includes tear sections and transition sections is adopted, and the semicircular tube forms a joint connection between the transition section of the seat body through the tear line, which increases the connection area, and forms multiple fixed connections through inserts and injection molding materials. Improve the connection strength between the tube body and the seat body.
The connection strength between the inlet tube body and the seat body is significantly improved, ensuring that it is not easy to fall off under high pushing force, reducing manufacturing difficulty and manufacturing cost, and enhancing the stability and safety of the pump head.
Smart Images
Figure CN222195717U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to an introducer and a catheter pump system. Background Art
[0002] The catheter pump is used to insert into the desired position of the heart of a heart failure patient to assist the heart's pumping function. The distal pump head of the catheter pump is a self-expanding structure. In order to deliver it into the human blood vessels with a smaller intervention size, the pump head needs to be folded outside the body and then expanded after entering the human blood vessels. Usually, the pump head is switched between the folded state and the expanded state through an introducer.
[0003] The introducer includes an introducer catheter and an introducer seat. The introducer catheter is generally made of PTFE (polytetrafluoroethylene) material, because the PTFE surface is relatively smooth, which can reduce the friction with the pump head and reduce the pushing force. The introducer seat is generally made of ABS (a copolymer of acrylonitrile, butadiene, and styrene). However, PTFE and ABS are not easy to connect. In the prior art, the proximal end of the introducer catheter is connected to the inner cavity of the cylindrical part in the middle of the introducer seat. This connection method is not strong enough and may cause the introducer catheter to fall off the introducer seat when subjected to a large pushing force. Utility Model Content
[0004] The utility model aims to provide an introducer and a catheter pump system, which improves the connection strength between the introducer tube body and the introducer seat body.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] An importer, comprising:
[0007] A seat body, which is provided with a guide cavity, wherein the guide cavity includes an enlarged section, a reduced section and a transition section, wherein the diameter of the reduced section is smaller than the diameter of the enlarged section, and the transition section connects the reduced section and the enlarged section;
[0008] The tube body comprises a main body section and a tearing section, wherein the tearing section is connected to the proximal end of the main body section, and the tearing section is provided with two relatively distributed tearing lines, and the tearing lines penetrate the tearing section toward the proximal end along the axial direction of the tube body, and the tearing section can be torn along the two tearing lines to form two semicircular tubes; the proximal end of the main body section is inserted in the reduction section, and the tearing section is inserted in the transition section, and the outer sides of the two semicircular tubes are respectively attached to the inner walls on the opposite sides of the transition section.
[0009] As a preferred technical solution of the introducer, the proximal ends of the two semicircular tubes are folded outward to form flanges, and the flanges are embedded in the inner wall of the transition section.
[0010] As a preferred technical solution of the introducer, a plurality of through holes are provided on the two semicircular tubes, and a plurality of protrusions corresponding to and embedded in the plurality of through holes are formed on the inner wall of the transition section.
[0011] As a preferred technical solution for the introducer, the proximal end of the main body segment is provided with a plurality of through holes, and the inner wall of the reduction segment is formed with a plurality of protrusions which are correspondingly embedded in the plurality of through holes; or, the outer wall of the proximal end of the main body segment is bonded and fixed to the inner wall of the reduction segment; or, there is no connection relationship between the proximal end of the main body segment and the reduction segment.
[0012] As a preferred technical solution of the introducer, the seat body is injection molded, and the protrusion is formed by the injection material flowing into the through hole.
[0013] As a preferred technical solution of the introducer, it also includes an insert, which is arranged on the inner side of the semicircular tube and is fixedly connected to the seat body to clamp and fix the semicircular tube.
[0014] As a preferred technical solution of the introducer, the insert protrudes from the semicircular tube at least from two sides of the semicircular tube, and the portion of the insert protruding from the semicircular tube is fixedly connected to the seat body.
[0015] As a preferred technical solution of the introducer, the material of the insert is the same as that of the seat body, and the seat body is injection molded; the insert is a component independent of the tube body and the seat body.
[0016] As a preferred technical solution of the introducer, there are two inserts, and the two inserts cover the two semicircular tubes in a one-to-one correspondence; or, there is one insert, and the one insert covers the two semicircular tubes at the same time.
[0017] As a preferred technical solution for the introducer, the wall thickness of the guide cavity remains consistent; the reducing section and the expanding section are both cylindrical, the transition section is conical, the small diameter end of the transition section is connected to the reducing section, and the large diameter end of the transition section is connected to the expanding section; the reducing section is located at the distal end of the transition section, and the expanding section is located at the proximal end of the transition section.
[0018] A catheter pump system comprises a catheter pump and an introducer as described in any of the above schemes, characterized in that the catheter pump comprises a catheter, a motor and a pump head, the motor is connected to the proximal end of the catheter, the pump head is connected to the distal end of the catheter, a drive shaft connecting the power output end of the motor and the impeller in the pump head is passed through the catheter; the pump head has a folded state and an expanded state, and the introducer is used to switch the pump head between the folded state and the expanded state.
[0019] As a preferred technical solution for the catheter pump system, before the pump head is compressed, the catheter pump and the introducer are arranged separately; when the pump head is compressed, the distal end of the catheter pump is extended from the proximal end of the introducer into the introducer, and the catheter is pushed toward the distal end or the introducer is pulled toward the proximal end, so that the pump head is gradually compressed from the expanded state to the folded state; in the folded state, the pump head is completely located in the main body section.
[0020] Beneficial effects of the utility model:
[0021] The utility model provides an introducer, comprising a seat body and a tube body, wherein the tube body is arranged to comprise a main body section and a tearing section, wherein the tearing section is fixedly connected with a transition section of the seat body, thereby increasing an area of fixed connection between the tube body and the seat body and improving connection strength between the tube body and the seat body; and the tearing section is formed into two semicircular tubes in the form of a tearing line, and the two semicircular tubes are made to fit the inner wall of the transition section of the seat body, thereby reducing processing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the structure of the catheter pump provided by an embodiment of the utility model;
[0023] Figure 2 It is a schematic diagram of the positional relationship between the pump head of the catheter pump provided by the embodiment of the utility model and the introducer when the pump head is not compressed;
[0024] Figure 3 It is a structural schematic diagram of the introducer provided in an embodiment of the utility model;
[0025] Figure 4 is a cross-sectional view of an introducer provided by an embodiment of the utility model;
[0026] Figure 5 yes Figure 4 A partial enlarged view of the middle A;
[0027] Figure 6 It is a structural schematic diagram of the tube body involved in the embodiment of the utility model.
[0028] In the figure:
[0029] 1. Catheter; 2. Motor; 3. Pump head;
[0030] 100. Importer;
[0031] 10. seat body; 11. guide cavity; 111. expansion section; 112. reduction section; 113. transition section;
[0032] 20, tube body; 21, main body section; 22, tearing section; 221, tearing line; 222, semicircular tube; 223, flange;
[0033] 30. Insert. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0037] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0040] In the description of the present utility model, the "proximal end" refers to the end of the medical device close to the operator, and the "distal end" refers to the end of the medical device far from the operator.
[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0042] like Figure 1 As shown, an embodiment of the utility model provides a catheter pump system, including a catheter pump, the catheter pump including a catheter 1, a motor 2 and a pump head 3, the motor 2 is connected to the proximal end of the catheter 1, the pump head 3 is connected to the distal end of the catheter 1, and a drive shaft connecting the power output end of the motor 2 and the impeller in the pump head 3 is passed through the catheter 1, and the drive shaft is used to transmit the power of the motor 2 to the pump head 3 to achieve blood pumping. The pump head 3 and the front end of the catheter 1 are delivered into and maintained in the subject's body. It is desirable that the size of the pump head 2 and the catheter 1 be as small as possible. The smaller pump head 3 and the catheter 1 can enter the subject's body through a smaller puncture port to reduce the pain caused to the subject by the interventional process. Therefore, in order to reduce the size of the puncture port while ensuring a large flow rate of the pump head 3, the pump head 3 is configured as a foldable pump head. The pump head 3 has a folded state and an unfolded state. In the interventional configuration corresponding to the pump head 3, the pump head 3 is in the folded state, and the pump head 3 intervenes in the subject's vascular system and / or transports blood in the subject's vascular system with a smaller size; in the working configuration corresponding to the pump head 3, the pump head 3 is in the unfolded state, and the pump head 3 pumps blood in the subject's body with a larger size.
[0043] The catheter pump system provided by the embodiment of the utility model further includes an introducer 100, which is used to switch the pump head 3 between the folded state and the unfolded state. The introducer 100 has a pre-folding channel for receiving the pump head 3 in the unfolded state, so as to switch the pump head 3 to the folded state. Before compressing the pump head 3, the introducer 100 is separately arranged from the catheter pump, such as Figure 2 As shown; when compressing the pump head 3, the distal end of the catheter pump is extended into the proximal end of the introducer 100, and the catheter 1 is pushed distally or the introducer 100 is pulled proximally, so that the pump head 3 is gradually compressed from the expanded state to the folded state, and the pump head 3 is forced to fold; in the folded state, the pump head 3 is completely located in the introducer 100. When the pump head 3 moves distally relative to the introducer 100 until it moves out of the distal end of the introducer 100, the radial constraint on the pump head 3 disappears, and the pump head 3 switches to the expanded state.
[0044] like Figures 3 to 6 As shown, the introducer 100 involved in the embodiment of the utility model includes a seat body 10 and a tube body 20. The seat body 10 is provided with a guide cavity 11. The guide cavity 11 includes an enlarged section 111, a reduced section 112 and a transition section 113. The reduced section 112 and the enlarged section 111 are both cylindrical. The diameter of the reduced section 112 is smaller than the diameter of the enlarged section 111. The transition section 113 is conical. The small diameter end of the transition section 113 is connected to the reduced section 112, and the large diameter end is connected to the enlarged section 111. The reduced section 112 is located at the distal end of the transition section 113, and the enlarged section 111 is located at the proximal end of the transition section 113. The tube body 20 includes a main body section 21 and a tearing section 22. The main body section 21 is provided with the above-mentioned pre-folding channel, which is communicated with the guide cavity 11. The tearing section 22 is connected to the proximal end of the main body section 21. The tearing section 22 is provided with two relatively distributed tearing lines 221. The tearing lines 221 pass through the tearing section 22 toward the proximal end along the axial direction of the tube body 20. The tearing section 22 can be torn along the two tearing lines 221 to form two semicircular tubes 222; the proximal end of the main body section 21 is inserted in the reduction section 112, the tearing section 22 is inserted in the transition section 113, and the outer side surfaces of the two semicircular tubes 222 are respectively attached to the inner walls on the opposite sides of the transition section 113. In order to reduce the manufacturing difficulty of the tube body 20 and simplify the manufacturing process of the introducer 100, a tear line 221 of a certain length is processed at the proximal end of a complete tube body 20 of equal diameter to form a tear segment 22. The tear segment 22 is separated into two semicircular tubes 222 along the tear line 221, so as to form a connection portion for connecting with the transition section 113. The connection portion forms a cone as a whole, but the cone is disconnected in the circumferential direction, and the disconnection point is the tear line 221. Such a disconnection design can also help the insert 30 mentioned below to be better connected with the seat body 10. If the distal end of the tube body 20 is a cylindrical section and the proximal end is a circumferentially continuous conical section, such a tube body 20 is undoubtedly more expensive to manufacture than a tube body 20 of equal diameter, and it is also difficult to obtain it through a complete tube. Generally, the cylindrical section and the conical section are manufactured separately and then fixedly connected, which also reduces the connection strength of the tube body 20.
[0045] The pump head 3 enters the pre-folding channel from the guide cavity 11. The inner diameter of the expansion section 111 of the guide cavity 11 is at least not less than the diameter of the pump head 3 in the expanded state. The expansion section 111 plays a guiding role to avoid the inner diameter of the pre-folding channel and the diameter of the pump head 3 in the expanded state being too different, which may cause the pump head 3 to be blocked from folding; the inner diameter of the reduction section 112 is at least not greater than the inner diameter of the pre-folding channel, so that the pump head 3 in the folded state can be smoothly transferred from the reduction section 112 to the pre-folding channel; the inner diameter of the transition section 113 gradually decreases, and the pump head 3 slowly and gradually folds through the transition section 113, reducing the folding force and improving the smoothness of the pump head 3 entering the introducer 100. In this embodiment, the tube body 20 is made of PTFE (polytetrafluoroethylene), and the PTFE surface is relatively smooth, which can reduce the friction with the pump head and reduce the pushing force.
[0046] The tube body 20 in this embodiment is configured to include a main body section 21 and a tearing section 22, and the tearing section 22 forms a fixed connection with the transition section 113 of the seat body 10, thereby increasing the area of the fixed connection between the tube body 20 and the seat body 10 and improving the connection strength between the tube body 20 and the seat body 10; and the tearing section 22 forms two semicircular tubes 222 by setting a tearing line 221, and the two semicircular tubes 222 are made to fit the inner wall of the transition section 113 of the seat body 10. Compared with processing a conical section, the conical section and the transition section 113 are fit and fixed, which greatly reduces the processing difficulty. It should be noted that the distal end of the tear line 221 cannot extend to the main body section 21, because the main body section 21 forms a pre-folding channel of the pump head 3, that is, the delivery channel of the pump head 3. If the tear line 221 extends to the main body section 21, it will affect the smoothness of the delivery channel. Moreover, the delivery channel is used to compress the pump head 3 of the catheter pump and needs to withstand the outward force from the pump head 3 in a compressed state. The existence of the tear line 221 will reduce the pressure-bearing capacity of the delivery channel. In severe cases, the compression force of the pump head 3 may break the main body section 21. In addition, a fixed connection can be formed between the main body section 21 and the reduced section 112 of the seat body 10, such as the protrusion and through hole connection described below, or adhesive fixation. In this way, connecting structures are provided at multiple locations of the tube body 20, which can undoubtedly improve the connection strength between the tube body 20 and the seat body 10; if the connection requirements between the tube body 20 and the seat body 10 can be met only by the connection relationship between the two semicircular tubes 222 and the transition section 113, then there may be no connection relationship between the main body section 21 and the reduced section 112 of the seat body 10, which can reduce the processing steps of the tube body 20 and the seat body 10 and reduce the manufacturing cost.
[0047] The proximal ends of the two semicircular tubes 222 are both folded outward to form flanges 223, and the flanges 223 are embedded in the inner wall of the transition section 113, further improving the connection strength between the tube body 20 and the seat body 10. As described above, when the pump head 3 of the catheter pump is compressed by the introducer 100, the tube body 20 of the introducer 100 is subjected to the thrust from the pump head 3 pointing from the proximal end to the distal end, and the flanges 223 are embedded in the inner wall of the transition section 113. The flanges 223 can form a hook to hook the seat body 10, thereby enhancing the ability to withstand the thrust. Moreover, both the inner and outer surfaces of the flanges 223 can form fixed surfaces, further increasing the connection area between the tube body 20 of the introducer 100 and the transition section 113. In this embodiment, the seat body 10 is injection molded. When the seat body 10 is injection molded, the flanges 223 are directly molded into the inner wall of the transition section 113, so that a reliable connection relationship is formed between the flanges 223 and the material of the seat body 10.
[0048] A plurality of through holes are provided on the two semicircular tubes 222, and a plurality of protrusions corresponding to and embedded in the plurality of through holes are formed on the inner wall of the transition section 113. Further, a plurality of through holes are also provided on the proximal end of the main body section 21, and a plurality of protrusions corresponding to and embedded in the plurality of through holes are formed on the inner wall of the reduction section 112. Through this arrangement, the connection strength between the tube body 20 and the seat body 10 is further improved. In this embodiment, the seat body 10 is injection molded, and the protrusions are formed by the injection molding material flowing into the through holes, which can simplify the manufacturing process of the protrusions and enable the seat body 10 and the tube body 20 to be mutually embedded to form a reliable connection relationship.
[0049] The wall thickness of the guide cavity 11 should be kept consistent to avoid defects such as pits and collapse on the surface of the seat body 10 when the seat body 10 is injection molded.
[0050] Furthermore, the introducer 100 provided in this embodiment also includes an insert 30, which is arranged on the inner side of the semicircular tube 222, and the insert 30 is fixedly connected to the seat body 10 to clamp and fix the semicircular tube 222. The insert 30 is a component that exists independently of the tube body 20 and the seat body 10. There is no direct connection between the insert 30 and the two semicircular tubes 222. The insert 20, the semicircular tube 222, and the seat body 10 are arranged in sequence from the inside to the outside. The insert 20 is fixedly connected to the seat body 10, and the semicircular tube 222 is clamped between the insert 20 and the seat body 10 to form a sandwich structure. This is another insurance measure to prevent the connection between the tube body 20 and the seat body 10 from falling off, and further enhances the connection strength between the tube body 20 and the seat body 10. In this embodiment, the insert 30 protrudes from the semicircular tube 222 at least from both sides of the semicircular tube 222. In other words, the semicircular tube 222 has three sides, namely, two sides formed by two tear lines 221 and one side located at the proximal end, and the insert 30 protrudes from the semicircular tube 222 at least from the two sides of the semicircular tube 222. The part of the insert 30 protruding from the semicircular tube 222 is fixedly connected to the seat body 10. Preferably, the material of the insert 30 is the same as that of the seat body 10. When the seat body 10 is injection molded, the injection molding material fuses the part of the insert 30 protruding from the semicircular tube 222, and the connection method is simple and the connection is firm. In this embodiment, the seat body 10 and the inlay are both made of ABS (a copolymer of acrylonitrile, butadiene, and styrene).
[0051] The number of inserts 30 can be two, and the two inserts 30 cover the two semicircular tubes 222 one by one; or the number of inserts 30 can be one, and the one insert 30 covers the two semicircular tubes 222 at the same time. The two inserts 30 can form more connection points with the seat body 10, so that the connection strength between the tube body 20 and the seat body 10 is higher; and the one insert 30 can simplify the connection process, and only one insert 30 needs to be positioned.
[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. An introducer, characterized in that: include: A seat body (10) is provided with a guide cavity (11), wherein the guide cavity (11) comprises an enlarged section (111), a reduced section (112) and a transition section (113), wherein the diameter of the reduced section (112) is smaller than the diameter of the enlarged section (111), and the transition section (113) connects the reduced section (112) and the enlarged section (111); A tube body (20), comprising a main body section (21) and a tearing section (22), wherein the tearing section (22) is connected to the proximal end of the main body section (21), and the tearing section (22) is provided with two tearing lines (221) which are distributed opposite to each other, and the tearing lines (221) penetrate the tearing section (22) along the axial direction of the tube body (20) toward the proximal end, and the tearing section (22) can be torn along the two tearing lines (221) to form two semicircular tubes (222); the proximal end of the main body section (21) is inserted into the shrinking section (112), and the tearing section (22) is inserted into the transition section (113), and the outer sides of the two semicircular tubes (222) are respectively attached to the inner walls of the transition section (113) on two opposite sides.
2. The introducer according to claim 1, characterized in that: The proximal ends of the two semicircular tubes (222) are both folded outward to form flanges (223), and the flanges (223) are embedded in the inner wall of the transition section (113).
3. The introducer according to claim 1, characterized in that: A plurality of through holes are provided on the two semicircular tubes (222), and a plurality of protrusions corresponding to and embedded in the plurality of through holes are formed on the inner wall of the transition section (113).
4. The introducer according to claim 1, characterized in that: The proximal end portion of the main body section (21) is provided with a plurality of through holes, and the inner wall of the reduction section (112) is formed with a plurality of protrusions correspondingly embedded in the plurality of through holes; or, the outer wall of the proximal end portion of the main body section (21) is bonded and fixed to the inner wall of the reduction section (112); or, there is no connection relationship between the proximal end portion of the main body section (21) and the reduction section (112).
5. The introducer according to claim 3 or 4, characterized in that: The seat body (10) is formed by injection molding, and the protrusion is formed by the injection material flowing into the through hole.
6. The introducer according to claim 1, characterized in that: It also includes an insert (30), which is arranged on the inner side of the semicircular tube (222), and the insert (30) is fixedly connected to the seat body (10) to clamp and fix the semicircular tube (222).
7. The introducer according to claim 6, characterized in that: The insert (30) protrudes out of the semicircular tube (222) at least from two sides of the semicircular tube (222), and the portion of the insert (30) protruding out of the semicircular tube (222) is fixedly connected to the seat body (10).
8. The introducer according to claim 6 or 7, characterized in that: The material of the insert (30) is the same as that of the seat body (10), and the seat body (10) is injection molded; the insert (30) is a component independent of the tube body (20) and the seat body (10).
9. The introducer according to claim 6 or 7, characterized in that: There are two inserts (30), and the two inserts (30) cover the two semicircular tubes (222) in a one-to-one correspondence; or, there is one insert (30), and the one insert (30) covers the two semicircular tubes (222) at the same time.
10. The introducer according to claim 1, characterized in that: The wall thickness of the guide cavity (11) remains consistent; the reducing section (112) and the expanding section (111) are both cylindrical, the transition section (113) is conical, the small diameter end of the transition section (113) is connected to the reducing section (112), and the large diameter end of the transition section (113) is connected to the expanding section (111); the reducing section (112) is located at the distal end of the transition section (113), and the expanding section (111) is located at the proximal end of the transition section (113).
11. A catheter pump system, comprising a catheter pump and an introducer (100) according to any one of claims 1 to 10, characterized in that: The catheter pump comprises a catheter, a motor and a pump head, wherein the motor is connected to the proximal end of the catheter, the pump head is connected to the distal end of the catheter, and a drive shaft connecting the power output end of the motor and the impeller in the pump head is passed through the catheter; the pump head has a folded state and an expanded state, and the introducer (100) is used to switch the pump head between the folded state and the expanded state.
12. The catheter pump system according to claim 11, characterized in that Before compressing the pump head, the catheter pump and the introducer (100) are separately arranged; when compressing the pump head, the distal end of the catheter pump is extended from the proximal end of the introducer (100) into the introducer (100), and the catheter is pushed toward the distal end or the introducer (100) is pulled toward the proximal end, so that the pump head is gradually compressed from the expanded state to the folded state; in the folded state, the pump head is completely located in the main body section (21).